1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifdef _WIN64
26 // Must be at least Windows 2000 or XP to use VectoredExceptions
27 #define _WIN32_WINNT 0x500
28 #endif
29
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_windows.h"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "mutex_windows.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/extendedPC.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/hpi.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/osThread.hpp"
57 #include "runtime/perfMemory.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/statSampler.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/runtimeService.hpp"
65 #include "thread_windows.inline.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/growableArray.hpp"
69 #include "utilities/vmError.hpp"
70 #ifdef TARGET_ARCH_x86
71 # include "assembler_x86.inline.hpp"
72 # include "nativeInst_x86.hpp"
73 #endif
74 #ifdef COMPILER1
75 #include "c1/c1_Runtime1.hpp"
76 #endif
77 #ifdef COMPILER2
78 #include "opto/runtime.hpp"
79 #endif
80
81 #ifdef _DEBUG
82 #include <crtdbg.h>
83 #endif
84
85
86 #include <windows.h>
87 #include <sys/types.h>
88 #include <sys/stat.h>
89 #include <sys/timeb.h>
90 #include <objidl.h>
91 #include <shlobj.h>
92
93 #include <malloc.h>
94 #include <signal.h>
95 #include <direct.h>
96 #include <errno.h>
97 #include <fcntl.h>
98 #include <io.h>
99 #include <process.h> // For _beginthreadex(), _endthreadex()
100 #include <imagehlp.h> // For os::dll_address_to_function_name
101
102 /* for enumerating dll libraries */
103 #include <tlhelp32.h>
104 #include <vdmdbg.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _WIN64
124 PVOID topLevelVectoredExceptionHandler = NULL;
125 #endif
126
127 #ifdef _M_IA64
128 #define __CPU__ ia64
129 #elif _M_AMD64
130 #define __CPU__ amd64
131 #else
132 #define __CPU__ i486
133 #endif
134
135 // save DLL module handle, used by GetModuleFileName
136
137 HINSTANCE vm_lib_handle;
138 static int getLastErrorString(char *buf, size_t len);
139
140 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
141 switch (reason) {
142 case DLL_PROCESS_ATTACH:
143 vm_lib_handle = hinst;
144 if(ForceTimeHighResolution)
145 timeBeginPeriod(1L);
146 break;
147 case DLL_PROCESS_DETACH:
148 if(ForceTimeHighResolution)
149 timeEndPeriod(1L);
150 #ifdef _WIN64
151 if (topLevelVectoredExceptionHandler != NULL) {
152 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
153 topLevelVectoredExceptionHandler = NULL;
154 }
155 #endif
156 break;
157 default:
158 break;
159 }
160 return true;
161 }
162
163 static inline double fileTimeAsDouble(FILETIME* time) {
164 const double high = (double) ((unsigned int) ~0);
165 const double split = 10000000.0;
166 double result = (time->dwLowDateTime / split) +
167 time->dwHighDateTime * (high/split);
168 return result;
169 }
170
171 // Implementation of os
172
173 bool os::getenv(const char* name, char* buffer, int len) {
174 int result = GetEnvironmentVariable(name, buffer, len);
175 return result > 0 && result < len;
176 }
177
178
179 // No setuid programs under Windows.
180 bool os::have_special_privileges() {
181 return false;
182 }
183
184
185 // This method is a periodic task to check for misbehaving JNI applications
186 // under CheckJNI, we can add any periodic checks here.
187 // For Windows at the moment does nothing
188 void os::run_periodic_checks() {
189 return;
190 }
191
192 #ifndef _WIN64
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197 #endif
198 void os::init_system_properties_values() {
199 /* sysclasspath, java_home, dll_dir */
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 char *bin = "\\bin";
205 char home_dir[MAX_PATH];
206
207 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
208 os::jvm_path(home_dir, sizeof(home_dir));
209 // Found the full path to jvm[_g].dll.
210 // Now cut the path to <java_home>/jre if we can.
211 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
212 pslash = strrchr(home_dir, '\\');
213 if (pslash != NULL) {
214 *pslash = '\0'; /* get rid of \{client|server} */
215 pslash = strrchr(home_dir, '\\');
216 if (pslash != NULL)
217 *pslash = '\0'; /* get rid of \bin */
218 }
219 }
220
221 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
222 if (home_path == NULL)
223 return;
224 strcpy(home_path, home_dir);
225 Arguments::set_java_home(home_path);
226
227 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
228 if (dll_path == NULL)
229 return;
230 strcpy(dll_path, home_dir);
231 strcat(dll_path, bin);
232 Arguments::set_dll_dir(dll_path);
233
234 if (!set_boot_path('\\', ';'))
235 return;
236 }
237
238 /* library_path */
239 #define EXT_DIR "\\lib\\ext"
240 #define BIN_DIR "\\bin"
241 #define PACKAGE_DIR "\\Sun\\Java"
242 {
243 /* Win32 library search order (See the documentation for LoadLibrary):
244 *
245 * 1. The directory from which application is loaded.
246 * 2. The current directory
247 * 3. The system wide Java Extensions directory (Java only)
248 * 4. System directory (GetSystemDirectory)
249 * 5. Windows directory (GetWindowsDirectory)
250 * 6. The PATH environment variable
251 */
252
253 char *library_path;
254 char tmp[MAX_PATH];
255 char *path_str = ::getenv("PATH");
256
257 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
258 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
259
260 library_path[0] = '\0';
261
262 GetModuleFileName(NULL, tmp, sizeof(tmp));
263 *(strrchr(tmp, '\\')) = '\0';
264 strcat(library_path, tmp);
265
266 strcat(library_path, ";.");
267
268 GetWindowsDirectory(tmp, sizeof(tmp));
269 strcat(library_path, ";");
270 strcat(library_path, tmp);
271 strcat(library_path, PACKAGE_DIR BIN_DIR);
272
273 GetSystemDirectory(tmp, sizeof(tmp));
274 strcat(library_path, ";");
275 strcat(library_path, tmp);
276
277 GetWindowsDirectory(tmp, sizeof(tmp));
278 strcat(library_path, ";");
279 strcat(library_path, tmp);
280
281 if (path_str) {
282 strcat(library_path, ";");
283 strcat(library_path, path_str);
284 }
285
286 Arguments::set_library_path(library_path);
287 FREE_C_HEAP_ARRAY(char, library_path);
288 }
289
290 /* Default extensions directory */
291 {
292 char path[MAX_PATH];
293 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
294 GetWindowsDirectory(path, MAX_PATH);
295 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
296 path, PACKAGE_DIR, EXT_DIR);
297 Arguments::set_ext_dirs(buf);
298 }
299 #undef EXT_DIR
300 #undef BIN_DIR
301 #undef PACKAGE_DIR
302
303 /* Default endorsed standards directory. */
304 {
305 #define ENDORSED_DIR "\\lib\\endorsed"
306 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
307 char * buf = NEW_C_HEAP_ARRAY(char, len);
308 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
309 Arguments::set_endorsed_dirs(buf);
310 #undef ENDORSED_DIR
311 }
312
313 #ifndef _WIN64
314 // set our UnhandledExceptionFilter and save any previous one
315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
316 #endif
317
318 // Done
319 return;
320 }
321
322 void os::breakpoint() {
323 DebugBreak();
324 }
325
326 // Invoked from the BREAKPOINT Macro
327 extern "C" void breakpoint() {
328 os::breakpoint();
329 }
330
331 // Returns an estimate of the current stack pointer. Result must be guaranteed
332 // to point into the calling threads stack, and be no lower than the current
333 // stack pointer.
334
335 address os::current_stack_pointer() {
336 int dummy;
337 address sp = (address)&dummy;
338 return sp;
339 }
340
341 // os::current_stack_base()
342 //
343 // Returns the base of the stack, which is the stack's
344 // starting address. This function must be called
345 // while running on the stack of the thread being queried.
346
347 address os::current_stack_base() {
348 MEMORY_BASIC_INFORMATION minfo;
349 address stack_bottom;
350 size_t stack_size;
351
352 VirtualQuery(&minfo, &minfo, sizeof(minfo));
353 stack_bottom = (address)minfo.AllocationBase;
354 stack_size = minfo.RegionSize;
355
356 // Add up the sizes of all the regions with the same
357 // AllocationBase.
358 while( 1 )
359 {
360 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
361 if ( stack_bottom == (address)minfo.AllocationBase )
362 stack_size += minfo.RegionSize;
363 else
364 break;
365 }
366
367 #ifdef _M_IA64
368 // IA64 has memory and register stacks
369 stack_size = stack_size / 2;
370 #endif
371 return stack_bottom + stack_size;
372 }
373
374 size_t os::current_stack_size() {
375 size_t sz;
376 MEMORY_BASIC_INFORMATION minfo;
377 VirtualQuery(&minfo, &minfo, sizeof(minfo));
378 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
379 return sz;
380 }
381
382 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
383 const struct tm* time_struct_ptr = localtime(clock);
384 if (time_struct_ptr != NULL) {
385 *res = *time_struct_ptr;
386 return res;
387 }
388 return NULL;
389 }
390
391 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
392
393 // Thread start routine for all new Java threads
394 static unsigned __stdcall java_start(Thread* thread) {
395 // Try to randomize the cache line index of hot stack frames.
396 // This helps when threads of the same stack traces evict each other's
397 // cache lines. The threads can be either from the same JVM instance, or
398 // from different JVM instances. The benefit is especially true for
399 // processors with hyperthreading technology.
400 static int counter = 0;
401 int pid = os::current_process_id();
402 _alloca(((pid ^ counter++) & 7) * 128);
403
404 OSThread* osthr = thread->osthread();
405 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
406
407 if (UseNUMA) {
408 int lgrp_id = os::numa_get_group_id();
409 if (lgrp_id != -1) {
410 thread->set_lgrp_id(lgrp_id);
411 }
412 }
413
414
415 if (UseVectoredExceptions) {
416 // If we are using vectored exception we don't need to set a SEH
417 thread->run();
418 }
419 else {
420 // Install a win32 structured exception handler around every thread created
421 // by VM, so VM can genrate error dump when an exception occurred in non-
422 // Java thread (e.g. VM thread).
423 __try {
424 thread->run();
425 } __except(topLevelExceptionFilter(
426 (_EXCEPTION_POINTERS*)_exception_info())) {
427 // Nothing to do.
428 }
429 }
430
431 // One less thread is executing
432 // When the VMThread gets here, the main thread may have already exited
433 // which frees the CodeHeap containing the Atomic::add code
434 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
435 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
436 }
437
438 return 0;
439 }
440
441 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
442 // Allocate the OSThread object
443 OSThread* osthread = new OSThread(NULL, NULL);
444 if (osthread == NULL) return NULL;
445
446 // Initialize support for Java interrupts
447 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
448 if (interrupt_event == NULL) {
449 delete osthread;
450 return NULL;
451 }
452 osthread->set_interrupt_event(interrupt_event);
453
454 // Store info on the Win32 thread into the OSThread
455 osthread->set_thread_handle(thread_handle);
456 osthread->set_thread_id(thread_id);
457
458 if (UseNUMA) {
459 int lgrp_id = os::numa_get_group_id();
460 if (lgrp_id != -1) {
461 thread->set_lgrp_id(lgrp_id);
462 }
463 }
464
465 // Initial thread state is INITIALIZED, not SUSPENDED
466 osthread->set_state(INITIALIZED);
467
468 return osthread;
469 }
470
471
472 bool os::create_attached_thread(JavaThread* thread) {
473 #ifdef ASSERT
474 thread->verify_not_published();
475 #endif
476 HANDLE thread_h;
477 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
478 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
479 fatal("DuplicateHandle failed\n");
480 }
481 OSThread* osthread = create_os_thread(thread, thread_h,
482 (int)current_thread_id());
483 if (osthread == NULL) {
484 return false;
485 }
486
487 // Initial thread state is RUNNABLE
488 osthread->set_state(RUNNABLE);
489
490 thread->set_osthread(osthread);
491 return true;
492 }
493
494 bool os::create_main_thread(JavaThread* thread) {
495 #ifdef ASSERT
496 thread->verify_not_published();
497 #endif
498 if (_starting_thread == NULL) {
499 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
500 if (_starting_thread == NULL) {
501 return false;
502 }
503 }
504
505 // The primordial thread is runnable from the start)
506 _starting_thread->set_state(RUNNABLE);
507
508 thread->set_osthread(_starting_thread);
509 return true;
510 }
511
512 // Allocate and initialize a new OSThread
513 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
514 unsigned thread_id;
515
516 // Allocate the OSThread object
517 OSThread* osthread = new OSThread(NULL, NULL);
518 if (osthread == NULL) {
519 return false;
520 }
521
522 // Initialize support for Java interrupts
523 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
524 if (interrupt_event == NULL) {
525 delete osthread;
526 return NULL;
527 }
528 osthread->set_interrupt_event(interrupt_event);
529 osthread->set_interrupted(false);
530
531 thread->set_osthread(osthread);
532
533 if (stack_size == 0) {
534 switch (thr_type) {
535 case os::java_thread:
536 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
537 if (JavaThread::stack_size_at_create() > 0)
538 stack_size = JavaThread::stack_size_at_create();
539 break;
540 case os::compiler_thread:
541 if (CompilerThreadStackSize > 0) {
542 stack_size = (size_t)(CompilerThreadStackSize * K);
543 break;
544 } // else fall through:
545 // use VMThreadStackSize if CompilerThreadStackSize is not defined
546 case os::vm_thread:
547 case os::pgc_thread:
548 case os::cgc_thread:
549 case os::watcher_thread:
550 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
551 break;
552 }
553 }
554
555 // Create the Win32 thread
556 //
557 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
558 // does not specify stack size. Instead, it specifies the size of
559 // initially committed space. The stack size is determined by
560 // PE header in the executable. If the committed "stack_size" is larger
561 // than default value in the PE header, the stack is rounded up to the
562 // nearest multiple of 1MB. For example if the launcher has default
563 // stack size of 320k, specifying any size less than 320k does not
564 // affect the actual stack size at all, it only affects the initial
565 // commitment. On the other hand, specifying 'stack_size' larger than
566 // default value may cause significant increase in memory usage, because
567 // not only the stack space will be rounded up to MB, but also the
568 // entire space is committed upfront.
569 //
570 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
571 // for CreateThread() that can treat 'stack_size' as stack size. However we
572 // are not supposed to call CreateThread() directly according to MSDN
573 // document because JVM uses C runtime library. The good news is that the
574 // flag appears to work with _beginthredex() as well.
575
576 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
577 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
578 #endif
579
580 HANDLE thread_handle =
581 (HANDLE)_beginthreadex(NULL,
582 (unsigned)stack_size,
583 (unsigned (__stdcall *)(void*)) java_start,
584 thread,
585 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
586 &thread_id);
587 if (thread_handle == NULL) {
588 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
589 // without the flag.
590 thread_handle =
591 (HANDLE)_beginthreadex(NULL,
592 (unsigned)stack_size,
593 (unsigned (__stdcall *)(void*)) java_start,
594 thread,
595 CREATE_SUSPENDED,
596 &thread_id);
597 }
598 if (thread_handle == NULL) {
599 // Need to clean up stuff we've allocated so far
600 CloseHandle(osthread->interrupt_event());
601 thread->set_osthread(NULL);
602 delete osthread;
603 return NULL;
604 }
605
606 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
607
608 // Store info on the Win32 thread into the OSThread
609 osthread->set_thread_handle(thread_handle);
610 osthread->set_thread_id(thread_id);
611
612 // Initial thread state is INITIALIZED, not SUSPENDED
613 osthread->set_state(INITIALIZED);
614
615 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
616 return true;
617 }
618
619
620 // Free Win32 resources related to the OSThread
621 void os::free_thread(OSThread* osthread) {
622 assert(osthread != NULL, "osthread not set");
623 CloseHandle(osthread->thread_handle());
624 CloseHandle(osthread->interrupt_event());
625 delete osthread;
626 }
627
628
629 static int has_performance_count = 0;
630 static jlong first_filetime;
631 static jlong initial_performance_count;
632 static jlong performance_frequency;
633
634
635 jlong as_long(LARGE_INTEGER x) {
636 jlong result = 0; // initialization to avoid warning
637 set_high(&result, x.HighPart);
638 set_low(&result, x.LowPart);
639 return result;
640 }
641
642
643 jlong os::elapsed_counter() {
644 LARGE_INTEGER count;
645 if (has_performance_count) {
646 QueryPerformanceCounter(&count);
647 return as_long(count) - initial_performance_count;
648 } else {
649 FILETIME wt;
650 GetSystemTimeAsFileTime(&wt);
651 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
652 }
653 }
654
655
656 jlong os::elapsed_frequency() {
657 if (has_performance_count) {
658 return performance_frequency;
659 } else {
660 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
661 return 10000000;
662 }
663 }
664
665
666 julong os::available_memory() {
667 return win32::available_memory();
668 }
669
670 julong os::win32::available_memory() {
671 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
672 // value if total memory is larger than 4GB
673 MEMORYSTATUSEX ms;
674 ms.dwLength = sizeof(ms);
675 GlobalMemoryStatusEx(&ms);
676
677 return (julong)ms.ullAvailPhys;
678 }
679
680 julong os::physical_memory() {
681 return win32::physical_memory();
682 }
683
684 julong os::allocatable_physical_memory(julong size) {
685 #ifdef _LP64
686 return size;
687 #else
688 // Limit to 1400m because of the 2gb address space wall
689 return MIN2(size, (julong)1400*M);
690 #endif
691 }
692
693 // VC6 lacks DWORD_PTR
694 #if _MSC_VER < 1300
695 typedef UINT_PTR DWORD_PTR;
696 #endif
697
698 int os::active_processor_count() {
699 DWORD_PTR lpProcessAffinityMask = 0;
700 DWORD_PTR lpSystemAffinityMask = 0;
701 int proc_count = processor_count();
702 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
703 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
704 // Nof active processors is number of bits in process affinity mask
705 int bitcount = 0;
706 while (lpProcessAffinityMask != 0) {
707 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
708 bitcount++;
709 }
710 return bitcount;
711 } else {
712 return proc_count;
713 }
714 }
715
716 bool os::distribute_processes(uint length, uint* distribution) {
717 // Not yet implemented.
718 return false;
719 }
720
721 bool os::bind_to_processor(uint processor_id) {
722 // Not yet implemented.
723 return false;
724 }
725
726 static void initialize_performance_counter() {
727 LARGE_INTEGER count;
728 if (QueryPerformanceFrequency(&count)) {
729 has_performance_count = 1;
730 performance_frequency = as_long(count);
731 QueryPerformanceCounter(&count);
732 initial_performance_count = as_long(count);
733 } else {
734 has_performance_count = 0;
735 FILETIME wt;
736 GetSystemTimeAsFileTime(&wt);
737 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
738 }
739 }
740
741
742 double os::elapsedTime() {
743 return (double) elapsed_counter() / (double) elapsed_frequency();
744 }
745
746
747 // Windows format:
748 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
749 // Java format:
750 // Java standards require the number of milliseconds since 1/1/1970
751
752 // Constant offset - calculated using offset()
753 static jlong _offset = 116444736000000000;
754 // Fake time counter for reproducible results when debugging
755 static jlong fake_time = 0;
756
757 #ifdef ASSERT
758 // Just to be safe, recalculate the offset in debug mode
759 static jlong _calculated_offset = 0;
760 static int _has_calculated_offset = 0;
761
762 jlong offset() {
763 if (_has_calculated_offset) return _calculated_offset;
764 SYSTEMTIME java_origin;
765 java_origin.wYear = 1970;
766 java_origin.wMonth = 1;
767 java_origin.wDayOfWeek = 0; // ignored
768 java_origin.wDay = 1;
769 java_origin.wHour = 0;
770 java_origin.wMinute = 0;
771 java_origin.wSecond = 0;
772 java_origin.wMilliseconds = 0;
773 FILETIME jot;
774 if (!SystemTimeToFileTime(&java_origin, &jot)) {
775 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
776 }
777 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
778 _has_calculated_offset = 1;
779 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
780 return _calculated_offset;
781 }
782 #else
783 jlong offset() {
784 return _offset;
785 }
786 #endif
787
788 jlong windows_to_java_time(FILETIME wt) {
789 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
790 return (a - offset()) / 10000;
791 }
792
793 FILETIME java_to_windows_time(jlong l) {
794 jlong a = (l * 10000) + offset();
795 FILETIME result;
796 result.dwHighDateTime = high(a);
797 result.dwLowDateTime = low(a);
798 return result;
799 }
800
801 // For now, we say that Windows does not support vtime. I have no idea
802 // whether it can actually be made to (DLD, 9/13/05).
803
804 bool os::supports_vtime() { return false; }
805 bool os::enable_vtime() { return false; }
806 bool os::vtime_enabled() { return false; }
807 double os::elapsedVTime() {
808 // better than nothing, but not much
809 return elapsedTime();
810 }
811
812 jlong os::javaTimeMillis() {
813 if (UseFakeTimers) {
814 return fake_time++;
815 } else {
816 FILETIME wt;
817 GetSystemTimeAsFileTime(&wt);
818 return windows_to_java_time(wt);
819 }
820 }
821
822 #define NANOS_PER_SEC CONST64(1000000000)
823 #define NANOS_PER_MILLISEC 1000000
824 jlong os::javaTimeNanos() {
825 if (!has_performance_count) {
826 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
827 } else {
828 LARGE_INTEGER current_count;
829 QueryPerformanceCounter(¤t_count);
830 double current = as_long(current_count);
831 double freq = performance_frequency;
832 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
833 return time;
834 }
835 }
836
837 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
838 if (!has_performance_count) {
839 // javaTimeMillis() doesn't have much percision,
840 // but it is not going to wrap -- so all 64 bits
841 info_ptr->max_value = ALL_64_BITS;
842
843 // this is a wall clock timer, so may skip
844 info_ptr->may_skip_backward = true;
845 info_ptr->may_skip_forward = true;
846 } else {
847 jlong freq = performance_frequency;
848 if (freq < NANOS_PER_SEC) {
849 // the performance counter is 64 bits and we will
850 // be multiplying it -- so no wrap in 64 bits
851 info_ptr->max_value = ALL_64_BITS;
852 } else if (freq > NANOS_PER_SEC) {
853 // use the max value the counter can reach to
854 // determine the max value which could be returned
855 julong max_counter = (julong)ALL_64_BITS;
856 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
857 } else {
858 // the performance counter is 64 bits and we will
859 // be using it directly -- so no wrap in 64 bits
860 info_ptr->max_value = ALL_64_BITS;
861 }
862
863 // using a counter, so no skipping
864 info_ptr->may_skip_backward = false;
865 info_ptr->may_skip_forward = false;
866 }
867 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
868 }
869
870 char* os::local_time_string(char *buf, size_t buflen) {
871 SYSTEMTIME st;
872 GetLocalTime(&st);
873 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
874 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
875 return buf;
876 }
877
878 bool os::getTimesSecs(double* process_real_time,
879 double* process_user_time,
880 double* process_system_time) {
881 HANDLE h_process = GetCurrentProcess();
882 FILETIME create_time, exit_time, kernel_time, user_time;
883 BOOL result = GetProcessTimes(h_process,
884 &create_time,
885 &exit_time,
886 &kernel_time,
887 &user_time);
888 if (result != 0) {
889 FILETIME wt;
890 GetSystemTimeAsFileTime(&wt);
891 jlong rtc_millis = windows_to_java_time(wt);
892 jlong user_millis = windows_to_java_time(user_time);
893 jlong system_millis = windows_to_java_time(kernel_time);
894 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
895 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
896 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
897 return true;
898 } else {
899 return false;
900 }
901 }
902
903 void os::shutdown() {
904
905 // allow PerfMemory to attempt cleanup of any persistent resources
906 perfMemory_exit();
907
908 // flush buffered output, finish log files
909 ostream_abort();
910
911 // Check for abort hook
912 abort_hook_t abort_hook = Arguments::abort_hook();
913 if (abort_hook != NULL) {
914 abort_hook();
915 }
916 }
917
918 void os::abort(bool dump_core)
919 {
920 os::shutdown();
921 // no core dump on Windows
922 ::exit(1);
923 }
924
925 // Die immediately, no exit hook, no abort hook, no cleanup.
926 void os::die() {
927 _exit(-1);
928 }
929
930 // Directory routines copied from src/win32/native/java/io/dirent_md.c
931 // * dirent_md.c 1.15 00/02/02
932 //
933 // The declarations for DIR and struct dirent are in jvm_win32.h.
934
935 /* Caller must have already run dirname through JVM_NativePath, which removes
936 duplicate slashes and converts all instances of '/' into '\\'. */
937
938 DIR *
939 os::opendir(const char *dirname)
940 {
941 assert(dirname != NULL, "just checking"); // hotspot change
942 DIR *dirp = (DIR *)malloc(sizeof(DIR));
943 DWORD fattr; // hotspot change
944 char alt_dirname[4] = { 0, 0, 0, 0 };
945
946 if (dirp == 0) {
947 errno = ENOMEM;
948 return 0;
949 }
950
951 /*
952 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
953 * as a directory in FindFirstFile(). We detect this case here and
954 * prepend the current drive name.
955 */
956 if (dirname[1] == '\0' && dirname[0] == '\\') {
957 alt_dirname[0] = _getdrive() + 'A' - 1;
958 alt_dirname[1] = ':';
959 alt_dirname[2] = '\\';
960 alt_dirname[3] = '\0';
961 dirname = alt_dirname;
962 }
963
964 dirp->path = (char *)malloc(strlen(dirname) + 5);
965 if (dirp->path == 0) {
966 free(dirp);
967 errno = ENOMEM;
968 return 0;
969 }
970 strcpy(dirp->path, dirname);
971
972 fattr = GetFileAttributes(dirp->path);
973 if (fattr == 0xffffffff) {
974 free(dirp->path);
975 free(dirp);
976 errno = ENOENT;
977 return 0;
978 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
979 free(dirp->path);
980 free(dirp);
981 errno = ENOTDIR;
982 return 0;
983 }
984
985 /* Append "*.*", or possibly "\\*.*", to path */
986 if (dirp->path[1] == ':'
987 && (dirp->path[2] == '\0'
988 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
989 /* No '\\' needed for cases like "Z:" or "Z:\" */
990 strcat(dirp->path, "*.*");
991 } else {
992 strcat(dirp->path, "\\*.*");
993 }
994
995 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
996 if (dirp->handle == INVALID_HANDLE_VALUE) {
997 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
998 free(dirp->path);
999 free(dirp);
1000 errno = EACCES;
1001 return 0;
1002 }
1003 }
1004 return dirp;
1005 }
1006
1007 /* parameter dbuf unused on Windows */
1008
1009 struct dirent *
1010 os::readdir(DIR *dirp, dirent *dbuf)
1011 {
1012 assert(dirp != NULL, "just checking"); // hotspot change
1013 if (dirp->handle == INVALID_HANDLE_VALUE) {
1014 return 0;
1015 }
1016
1017 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1018
1019 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1020 if (GetLastError() == ERROR_INVALID_HANDLE) {
1021 errno = EBADF;
1022 return 0;
1023 }
1024 FindClose(dirp->handle);
1025 dirp->handle = INVALID_HANDLE_VALUE;
1026 }
1027
1028 return &dirp->dirent;
1029 }
1030
1031 int
1032 os::closedir(DIR *dirp)
1033 {
1034 assert(dirp != NULL, "just checking"); // hotspot change
1035 if (dirp->handle != INVALID_HANDLE_VALUE) {
1036 if (!FindClose(dirp->handle)) {
1037 errno = EBADF;
1038 return -1;
1039 }
1040 dirp->handle = INVALID_HANDLE_VALUE;
1041 }
1042 free(dirp->path);
1043 free(dirp);
1044 return 0;
1045 }
1046
1047 const char* os::dll_file_extension() { return ".dll"; }
1048
1049 const char* os::get_temp_directory() {
1050 const char *prop = Arguments::get_property("java.io.tmpdir");
1051 if (prop != 0) return prop;
1052 static char path_buf[MAX_PATH];
1053 if (GetTempPath(MAX_PATH, path_buf)>0)
1054 return path_buf;
1055 else{
1056 path_buf[0]='\0';
1057 return path_buf;
1058 }
1059 }
1060
1061 static bool file_exists(const char* filename) {
1062 if (filename == NULL || strlen(filename) == 0) {
1063 return false;
1064 }
1065 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1066 }
1067
1068 void os::dll_build_name(char *buffer, size_t buflen,
1069 const char* pname, const char* fname) {
1070 // Copied from libhpi
1071 const size_t pnamelen = pname ? strlen(pname) : 0;
1072 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1073
1074 // Quietly truncates on buffer overflow. Should be an error.
1075 if (pnamelen + strlen(fname) + 10 > buflen) {
1076 *buffer = '\0';
1077 return;
1078 }
1079
1080 if (pnamelen == 0) {
1081 jio_snprintf(buffer, buflen, "%s.dll", fname);
1082 } else if (c == ':' || c == '\\') {
1083 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1084 } else if (strchr(pname, *os::path_separator()) != NULL) {
1085 int n;
1086 char** pelements = split_path(pname, &n);
1087 for (int i = 0 ; i < n ; i++) {
1088 char* path = pelements[i];
1089 // Really shouldn't be NULL, but check can't hurt
1090 size_t plen = (path == NULL) ? 0 : strlen(path);
1091 if (plen == 0) {
1092 continue; // skip the empty path values
1093 }
1094 const char lastchar = path[plen - 1];
1095 if (lastchar == ':' || lastchar == '\\') {
1096 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1097 } else {
1098 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1099 }
1100 if (file_exists(buffer)) {
1101 break;
1102 }
1103 }
1104 // release the storage
1105 for (int i = 0 ; i < n ; i++) {
1106 if (pelements[i] != NULL) {
1107 FREE_C_HEAP_ARRAY(char, pelements[i]);
1108 }
1109 }
1110 if (pelements != NULL) {
1111 FREE_C_HEAP_ARRAY(char*, pelements);
1112 }
1113 } else {
1114 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1115 }
1116 }
1117
1118 // Needs to be in os specific directory because windows requires another
1119 // header file <direct.h>
1120 const char* os::get_current_directory(char *buf, int buflen) {
1121 return _getcwd(buf, buflen);
1122 }
1123
1124 //-----------------------------------------------------------
1125 // Helper functions for fatal error handler
1126
1127 // The following library functions are resolved dynamically at runtime:
1128
1129 // PSAPI functions, for Windows NT, 2000, XP
1130
1131 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1132 // SDK from Microsoft. Here are the definitions copied from psapi.h
1133 typedef struct _MODULEINFO {
1134 LPVOID lpBaseOfDll;
1135 DWORD SizeOfImage;
1136 LPVOID EntryPoint;
1137 } MODULEINFO, *LPMODULEINFO;
1138
1139 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1140 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1141 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1142
1143 // ToolHelp Functions, for Windows 95, 98 and ME
1144
1145 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1146 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1147 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1148
1149 bool _has_psapi;
1150 bool _psapi_init = false;
1151 bool _has_toolhelp;
1152
1153 static bool _init_psapi() {
1154 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1155 if( psapi == NULL ) return false ;
1156
1157 _EnumProcessModules = CAST_TO_FN_PTR(
1158 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1159 GetProcAddress(psapi, "EnumProcessModules")) ;
1160 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1161 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1162 GetProcAddress(psapi, "GetModuleFileNameExA"));
1163 _GetModuleInformation = CAST_TO_FN_PTR(
1164 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1165 GetProcAddress(psapi, "GetModuleInformation"));
1166
1167 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1168 _psapi_init = true;
1169 return _has_psapi;
1170 }
1171
1172 static bool _init_toolhelp() {
1173 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1174 if (kernel32 == NULL) return false ;
1175
1176 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1177 HANDLE(WINAPI *)(DWORD,DWORD),
1178 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1179 _Module32First = CAST_TO_FN_PTR(
1180 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1181 GetProcAddress(kernel32, "Module32First" ));
1182 _Module32Next = CAST_TO_FN_PTR(
1183 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1184 GetProcAddress(kernel32, "Module32Next" ));
1185
1186 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1187 return _has_toolhelp;
1188 }
1189
1190 #ifdef _WIN64
1191 // Helper routine which returns true if address in
1192 // within the NTDLL address space.
1193 //
1194 static bool _addr_in_ntdll( address addr )
1195 {
1196 HMODULE hmod;
1197 MODULEINFO minfo;
1198
1199 hmod = GetModuleHandle("NTDLL.DLL");
1200 if ( hmod == NULL ) return false;
1201 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1202 &minfo, sizeof(MODULEINFO)) )
1203 return false;
1204
1205 if ( (addr >= minfo.lpBaseOfDll) &&
1206 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1207 return true;
1208 else
1209 return false;
1210 }
1211 #endif
1212
1213
1214 // Enumerate all modules for a given process ID
1215 //
1216 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1217 // different API for doing this. We use PSAPI.DLL on NT based
1218 // Windows and ToolHelp on 95/98/Me.
1219
1220 // Callback function that is called by enumerate_modules() on
1221 // every DLL module.
1222 // Input parameters:
1223 // int pid,
1224 // char* module_file_name,
1225 // address module_base_addr,
1226 // unsigned module_size,
1227 // void* param
1228 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1229
1230 // enumerate_modules for Windows NT, using PSAPI
1231 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1232 {
1233 HANDLE hProcess ;
1234
1235 # define MAX_NUM_MODULES 128
1236 HMODULE modules[MAX_NUM_MODULES];
1237 static char filename[ MAX_PATH ];
1238 int result = 0;
1239
1240 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1241
1242 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1243 FALSE, pid ) ;
1244 if (hProcess == NULL) return 0;
1245
1246 DWORD size_needed;
1247 if (!_EnumProcessModules(hProcess, modules,
1248 sizeof(modules), &size_needed)) {
1249 CloseHandle( hProcess );
1250 return 0;
1251 }
1252
1253 // number of modules that are currently loaded
1254 int num_modules = size_needed / sizeof(HMODULE);
1255
1256 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1257 // Get Full pathname:
1258 if(!_GetModuleFileNameEx(hProcess, modules[i],
1259 filename, sizeof(filename))) {
1260 filename[0] = '\0';
1261 }
1262
1263 MODULEINFO modinfo;
1264 if (!_GetModuleInformation(hProcess, modules[i],
1265 &modinfo, sizeof(modinfo))) {
1266 modinfo.lpBaseOfDll = NULL;
1267 modinfo.SizeOfImage = 0;
1268 }
1269
1270 // Invoke callback function
1271 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1272 modinfo.SizeOfImage, param);
1273 if (result) break;
1274 }
1275
1276 CloseHandle( hProcess ) ;
1277 return result;
1278 }
1279
1280
1281 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1282 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1283 {
1284 HANDLE hSnapShot ;
1285 static MODULEENTRY32 modentry ;
1286 int result = 0;
1287
1288 if (!_has_toolhelp) return 0;
1289
1290 // Get a handle to a Toolhelp snapshot of the system
1291 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1292 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1293 return FALSE ;
1294 }
1295
1296 // iterate through all modules
1297 modentry.dwSize = sizeof(MODULEENTRY32) ;
1298 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1299
1300 while( not_done ) {
1301 // invoke the callback
1302 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1303 modentry.modBaseSize, param);
1304 if (result) break;
1305
1306 modentry.dwSize = sizeof(MODULEENTRY32) ;
1307 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1308 }
1309
1310 CloseHandle(hSnapShot);
1311 return result;
1312 }
1313
1314 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1315 {
1316 // Get current process ID if caller doesn't provide it.
1317 if (!pid) pid = os::current_process_id();
1318
1319 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1320 else return _enumerate_modules_windows(pid, func, param);
1321 }
1322
1323 struct _modinfo {
1324 address addr;
1325 char* full_path; // point to a char buffer
1326 int buflen; // size of the buffer
1327 address base_addr;
1328 };
1329
1330 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1331 unsigned size, void * param) {
1332 struct _modinfo *pmod = (struct _modinfo *)param;
1333 if (!pmod) return -1;
1334
1335 if (base_addr <= pmod->addr &&
1336 base_addr+size > pmod->addr) {
1337 // if a buffer is provided, copy path name to the buffer
1338 if (pmod->full_path) {
1339 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1340 }
1341 pmod->base_addr = base_addr;
1342 return 1;
1343 }
1344 return 0;
1345 }
1346
1347 bool os::dll_address_to_library_name(address addr, char* buf,
1348 int buflen, int* offset) {
1349 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1350 // return the full path to the DLL file, sometimes it returns path
1351 // to the corresponding PDB file (debug info); sometimes it only
1352 // returns partial path, which makes life painful.
1353
1354 struct _modinfo mi;
1355 mi.addr = addr;
1356 mi.full_path = buf;
1357 mi.buflen = buflen;
1358 int pid = os::current_process_id();
1359 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1360 // buf already contains path name
1361 if (offset) *offset = addr - mi.base_addr;
1362 return true;
1363 } else {
1364 if (buf) buf[0] = '\0';
1365 if (offset) *offset = -1;
1366 return false;
1367 }
1368 }
1369
1370 bool os::dll_address_to_function_name(address addr, char *buf,
1371 int buflen, int *offset) {
1372 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1373 // we need to initialize imagehlp/dbghelp, then load symbol table
1374 // for every module. That's too much work to do after a fatal error.
1375 // For an example on how to implement this function, see 1.4.2.
1376 if (offset) *offset = -1;
1377 if (buf) buf[0] = '\0';
1378 return false;
1379 }
1380
1381 void* os::dll_lookup(void* handle, const char* name) {
1382 return GetProcAddress((HMODULE)handle, name);
1383 }
1384
1385 // save the start and end address of jvm.dll into param[0] and param[1]
1386 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1387 unsigned size, void * param) {
1388 if (!param) return -1;
1389
1390 if (base_addr <= (address)_locate_jvm_dll &&
1391 base_addr+size > (address)_locate_jvm_dll) {
1392 ((address*)param)[0] = base_addr;
1393 ((address*)param)[1] = base_addr + size;
1394 return 1;
1395 }
1396 return 0;
1397 }
1398
1399 address vm_lib_location[2]; // start and end address of jvm.dll
1400
1401 // check if addr is inside jvm.dll
1402 bool os::address_is_in_vm(address addr) {
1403 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1404 int pid = os::current_process_id();
1405 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1406 assert(false, "Can't find jvm module.");
1407 return false;
1408 }
1409 }
1410
1411 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1412 }
1413
1414 // print module info; param is outputStream*
1415 static int _print_module(int pid, char* fname, address base,
1416 unsigned size, void* param) {
1417 if (!param) return -1;
1418
1419 outputStream* st = (outputStream*)param;
1420
1421 address end_addr = base + size;
1422 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1423 return 0;
1424 }
1425
1426 // Loads .dll/.so and
1427 // in case of error it checks if .dll/.so was built for the
1428 // same architecture as Hotspot is running on
1429 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1430 {
1431 void * result = LoadLibrary(name);
1432 if (result != NULL)
1433 {
1434 return result;
1435 }
1436
1437 long errcode = GetLastError();
1438 if (errcode == ERROR_MOD_NOT_FOUND) {
1439 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1440 ebuf[ebuflen-1]='\0';
1441 return NULL;
1442 }
1443
1444 // Parsing dll below
1445 // If we can read dll-info and find that dll was built
1446 // for an architecture other than Hotspot is running in
1447 // - then print to buffer "DLL was built for a different architecture"
1448 // else call getLastErrorString to obtain system error message
1449
1450 // Read system error message into ebuf
1451 // It may or may not be overwritten below (in the for loop and just above)
1452 getLastErrorString(ebuf, (size_t) ebuflen);
1453 ebuf[ebuflen-1]='\0';
1454 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1455 if (file_descriptor<0)
1456 {
1457 return NULL;
1458 }
1459
1460 uint32_t signature_offset;
1461 uint16_t lib_arch=0;
1462 bool failed_to_get_lib_arch=
1463 (
1464 //Go to position 3c in the dll
1465 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1466 ||
1467 // Read loacation of signature
1468 (sizeof(signature_offset)!=
1469 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1470 ||
1471 //Go to COFF File Header in dll
1472 //that is located after"signature" (4 bytes long)
1473 (os::seek_to_file_offset(file_descriptor,
1474 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1475 ||
1476 //Read field that contains code of architecture
1477 // that dll was build for
1478 (sizeof(lib_arch)!=
1479 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1480 );
1481
1482 ::close(file_descriptor);
1483 if (failed_to_get_lib_arch)
1484 {
1485 // file i/o error - report getLastErrorString(...) msg
1486 return NULL;
1487 }
1488
1489 typedef struct
1490 {
1491 uint16_t arch_code;
1492 char* arch_name;
1493 } arch_t;
1494
1495 static const arch_t arch_array[]={
1496 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1497 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1498 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1499 };
1500 #if (defined _M_IA64)
1501 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1502 #elif (defined _M_AMD64)
1503 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1504 #elif (defined _M_IX86)
1505 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1506 #else
1507 #error Method os::dll_load requires that one of following \
1508 is defined :_M_IA64,_M_AMD64 or _M_IX86
1509 #endif
1510
1511
1512 // Obtain a string for printf operation
1513 // lib_arch_str shall contain string what platform this .dll was built for
1514 // running_arch_str shall string contain what platform Hotspot was built for
1515 char *running_arch_str=NULL,*lib_arch_str=NULL;
1516 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1517 {
1518 if (lib_arch==arch_array[i].arch_code)
1519 lib_arch_str=arch_array[i].arch_name;
1520 if (running_arch==arch_array[i].arch_code)
1521 running_arch_str=arch_array[i].arch_name;
1522 }
1523
1524 assert(running_arch_str,
1525 "Didn't find runing architecture code in arch_array");
1526
1527 // If the architure is right
1528 // but some other error took place - report getLastErrorString(...) msg
1529 if (lib_arch == running_arch)
1530 {
1531 return NULL;
1532 }
1533
1534 if (lib_arch_str!=NULL)
1535 {
1536 ::_snprintf(ebuf, ebuflen-1,
1537 "Can't load %s-bit .dll on a %s-bit platform",
1538 lib_arch_str,running_arch_str);
1539 }
1540 else
1541 {
1542 // don't know what architecture this dll was build for
1543 ::_snprintf(ebuf, ebuflen-1,
1544 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1545 lib_arch,running_arch_str);
1546 }
1547
1548 return NULL;
1549 }
1550
1551
1552 void os::print_dll_info(outputStream *st) {
1553 int pid = os::current_process_id();
1554 st->print_cr("Dynamic libraries:");
1555 enumerate_modules(pid, _print_module, (void *)st);
1556 }
1557
1558 // function pointer to Windows API "GetNativeSystemInfo".
1559 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1560 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1561
1562 void os::print_os_info(outputStream* st) {
1563 st->print("OS:");
1564
1565 OSVERSIONINFOEX osvi;
1566 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1567 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1568
1569 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1570 st->print_cr("N/A");
1571 return;
1572 }
1573
1574 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1575 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1576 switch (os_vers) {
1577 case 3051: st->print(" Windows NT 3.51"); break;
1578 case 4000: st->print(" Windows NT 4.0"); break;
1579 case 5000: st->print(" Windows 2000"); break;
1580 case 5001: st->print(" Windows XP"); break;
1581 case 5002:
1582 case 6000:
1583 case 6001: {
1584 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1585 // find out whether we are running on 64 bit processor or not.
1586 SYSTEM_INFO si;
1587 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1588 // Check to see if _GetNativeSystemInfo has been initialized.
1589 if (_GetNativeSystemInfo == NULL) {
1590 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1591 _GetNativeSystemInfo =
1592 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1593 GetProcAddress(hKernel32,
1594 "GetNativeSystemInfo"));
1595 if (_GetNativeSystemInfo == NULL)
1596 GetSystemInfo(&si);
1597 } else {
1598 _GetNativeSystemInfo(&si);
1599 }
1600 if (os_vers == 5002) {
1601 if (osvi.wProductType == VER_NT_WORKSTATION &&
1602 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1603 st->print(" Windows XP x64 Edition");
1604 else
1605 st->print(" Windows Server 2003 family");
1606 } else if (os_vers == 6000) {
1607 if (osvi.wProductType == VER_NT_WORKSTATION)
1608 st->print(" Windows Vista");
1609 else
1610 st->print(" Windows Server 2008");
1611 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1612 st->print(" , 64 bit");
1613 } else if (os_vers == 6001) {
1614 if (osvi.wProductType == VER_NT_WORKSTATION) {
1615 st->print(" Windows 7");
1616 } else {
1617 // Unrecognized windows, print out its major and minor versions
1618 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1619 }
1620 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1621 st->print(" , 64 bit");
1622 } else { // future os
1623 // Unrecognized windows, print out its major and minor versions
1624 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1625 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1626 st->print(" , 64 bit");
1627 }
1628 break;
1629 }
1630 default: // future windows, print out its major and minor versions
1631 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1632 }
1633 } else {
1634 switch (os_vers) {
1635 case 4000: st->print(" Windows 95"); break;
1636 case 4010: st->print(" Windows 98"); break;
1637 case 4090: st->print(" Windows Me"); break;
1638 default: // future windows, print out its major and minor versions
1639 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1640 }
1641 }
1642 st->print(" Build %d", osvi.dwBuildNumber);
1643 st->print(" %s", osvi.szCSDVersion); // service pack
1644 st->cr();
1645 }
1646
1647 void os::print_memory_info(outputStream* st) {
1648 st->print("Memory:");
1649 st->print(" %dk page", os::vm_page_size()>>10);
1650
1651 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1652 // value if total memory is larger than 4GB
1653 MEMORYSTATUSEX ms;
1654 ms.dwLength = sizeof(ms);
1655 GlobalMemoryStatusEx(&ms);
1656
1657 st->print(", physical %uk", os::physical_memory() >> 10);
1658 st->print("(%uk free)", os::available_memory() >> 10);
1659
1660 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1661 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1662 st->cr();
1663 }
1664
1665 void os::print_siginfo(outputStream *st, void *siginfo) {
1666 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1667 st->print("siginfo:");
1668 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1669
1670 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1671 er->NumberParameters >= 2) {
1672 switch (er->ExceptionInformation[0]) {
1673 case 0: st->print(", reading address"); break;
1674 case 1: st->print(", writing address"); break;
1675 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1676 er->ExceptionInformation[0]);
1677 }
1678 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1679 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1680 er->NumberParameters >= 2 && UseSharedSpaces) {
1681 FileMapInfo* mapinfo = FileMapInfo::current_info();
1682 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1683 st->print("\n\nError accessing class data sharing archive." \
1684 " Mapped file inaccessible during execution, " \
1685 " possible disk/network problem.");
1686 }
1687 } else {
1688 int num = er->NumberParameters;
1689 if (num > 0) {
1690 st->print(", ExceptionInformation=");
1691 for (int i = 0; i < num; i++) {
1692 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1693 }
1694 }
1695 }
1696 st->cr();
1697 }
1698
1699 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1700 // do nothing
1701 }
1702
1703 static char saved_jvm_path[MAX_PATH] = {0};
1704
1705 // Find the full path to the current module, jvm.dll or jvm_g.dll
1706 void os::jvm_path(char *buf, jint buflen) {
1707 // Error checking.
1708 if (buflen < MAX_PATH) {
1709 assert(false, "must use a large-enough buffer");
1710 buf[0] = '\0';
1711 return;
1712 }
1713 // Lazy resolve the path to current module.
1714 if (saved_jvm_path[0] != 0) {
1715 strcpy(buf, saved_jvm_path);
1716 return;
1717 }
1718
1719 GetModuleFileName(vm_lib_handle, buf, buflen);
1720 strcpy(saved_jvm_path, buf);
1721 }
1722
1723
1724 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1725 #ifndef _WIN64
1726 st->print("_");
1727 #endif
1728 }
1729
1730
1731 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1732 #ifndef _WIN64
1733 st->print("@%d", args_size * sizeof(int));
1734 #endif
1735 }
1736
1737 // sun.misc.Signal
1738 // NOTE that this is a workaround for an apparent kernel bug where if
1739 // a signal handler for SIGBREAK is installed then that signal handler
1740 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1741 // See bug 4416763.
1742 static void (*sigbreakHandler)(int) = NULL;
1743
1744 static void UserHandler(int sig, void *siginfo, void *context) {
1745 os::signal_notify(sig);
1746 // We need to reinstate the signal handler each time...
1747 os::signal(sig, (void*)UserHandler);
1748 }
1749
1750 void* os::user_handler() {
1751 return (void*) UserHandler;
1752 }
1753
1754 void* os::signal(int signal_number, void* handler) {
1755 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1756 void (*oldHandler)(int) = sigbreakHandler;
1757 sigbreakHandler = (void (*)(int)) handler;
1758 return (void*) oldHandler;
1759 } else {
1760 return (void*)::signal(signal_number, (void (*)(int))handler);
1761 }
1762 }
1763
1764 void os::signal_raise(int signal_number) {
1765 raise(signal_number);
1766 }
1767
1768 // The Win32 C runtime library maps all console control events other than ^C
1769 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1770 // logoff, and shutdown events. We therefore install our own console handler
1771 // that raises SIGTERM for the latter cases.
1772 //
1773 static BOOL WINAPI consoleHandler(DWORD event) {
1774 switch(event) {
1775 case CTRL_C_EVENT:
1776 if (is_error_reported()) {
1777 // Ctrl-C is pressed during error reporting, likely because the error
1778 // handler fails to abort. Let VM die immediately.
1779 os::die();
1780 }
1781
1782 os::signal_raise(SIGINT);
1783 return TRUE;
1784 break;
1785 case CTRL_BREAK_EVENT:
1786 if (sigbreakHandler != NULL) {
1787 (*sigbreakHandler)(SIGBREAK);
1788 }
1789 return TRUE;
1790 break;
1791 case CTRL_CLOSE_EVENT:
1792 case CTRL_LOGOFF_EVENT:
1793 case CTRL_SHUTDOWN_EVENT:
1794 os::signal_raise(SIGTERM);
1795 return TRUE;
1796 break;
1797 default:
1798 break;
1799 }
1800 return FALSE;
1801 }
1802
1803 /*
1804 * The following code is moved from os.cpp for making this
1805 * code platform specific, which it is by its very nature.
1806 */
1807
1808 // Return maximum OS signal used + 1 for internal use only
1809 // Used as exit signal for signal_thread
1810 int os::sigexitnum_pd(){
1811 return NSIG;
1812 }
1813
1814 // a counter for each possible signal value, including signal_thread exit signal
1815 static volatile jint pending_signals[NSIG+1] = { 0 };
1816 static HANDLE sig_sem;
1817
1818 void os::signal_init_pd() {
1819 // Initialize signal structures
1820 memset((void*)pending_signals, 0, sizeof(pending_signals));
1821
1822 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1823
1824 // Programs embedding the VM do not want it to attempt to receive
1825 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1826 // shutdown hooks mechanism introduced in 1.3. For example, when
1827 // the VM is run as part of a Windows NT service (i.e., a servlet
1828 // engine in a web server), the correct behavior is for any console
1829 // control handler to return FALSE, not TRUE, because the OS's
1830 // "final" handler for such events allows the process to continue if
1831 // it is a service (while terminating it if it is not a service).
1832 // To make this behavior uniform and the mechanism simpler, we
1833 // completely disable the VM's usage of these console events if -Xrs
1834 // (=ReduceSignalUsage) is specified. This means, for example, that
1835 // the CTRL-BREAK thread dump mechanism is also disabled in this
1836 // case. See bugs 4323062, 4345157, and related bugs.
1837
1838 if (!ReduceSignalUsage) {
1839 // Add a CTRL-C handler
1840 SetConsoleCtrlHandler(consoleHandler, TRUE);
1841 }
1842 }
1843
1844 void os::signal_notify(int signal_number) {
1845 BOOL ret;
1846
1847 Atomic::inc(&pending_signals[signal_number]);
1848 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1849 assert(ret != 0, "ReleaseSemaphore() failed");
1850 }
1851
1852 static int check_pending_signals(bool wait_for_signal) {
1853 DWORD ret;
1854 while (true) {
1855 for (int i = 0; i < NSIG + 1; i++) {
1856 jint n = pending_signals[i];
1857 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1858 return i;
1859 }
1860 }
1861 if (!wait_for_signal) {
1862 return -1;
1863 }
1864
1865 JavaThread *thread = JavaThread::current();
1866
1867 ThreadBlockInVM tbivm(thread);
1868
1869 bool threadIsSuspended;
1870 do {
1871 thread->set_suspend_equivalent();
1872 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1873 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1874 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1875
1876 // were we externally suspended while we were waiting?
1877 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1878 if (threadIsSuspended) {
1879 //
1880 // The semaphore has been incremented, but while we were waiting
1881 // another thread suspended us. We don't want to continue running
1882 // while suspended because that would surprise the thread that
1883 // suspended us.
1884 //
1885 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1886 assert(ret != 0, "ReleaseSemaphore() failed");
1887
1888 thread->java_suspend_self();
1889 }
1890 } while (threadIsSuspended);
1891 }
1892 }
1893
1894 int os::signal_lookup() {
1895 return check_pending_signals(false);
1896 }
1897
1898 int os::signal_wait() {
1899 return check_pending_signals(true);
1900 }
1901
1902 // Implicit OS exception handling
1903
1904 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1905 JavaThread* thread = JavaThread::current();
1906 // Save pc in thread
1907 #ifdef _M_IA64
1908 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1909 // Set pc to handler
1910 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1911 #elif _M_AMD64
1912 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1913 // Set pc to handler
1914 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1915 #else
1916 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1917 // Set pc to handler
1918 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1919 #endif
1920
1921 // Continue the execution
1922 return EXCEPTION_CONTINUE_EXECUTION;
1923 }
1924
1925
1926 // Used for PostMortemDump
1927 extern "C" void safepoints();
1928 extern "C" void find(int x);
1929 extern "C" void events();
1930
1931 // According to Windows API documentation, an illegal instruction sequence should generate
1932 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1933 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1934 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1935
1936 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1937
1938 // From "Execution Protection in the Windows Operating System" draft 0.35
1939 // Once a system header becomes available, the "real" define should be
1940 // included or copied here.
1941 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1942
1943 #define def_excpt(val) #val, val
1944
1945 struct siglabel {
1946 char *name;
1947 int number;
1948 };
1949
1950 struct siglabel exceptlabels[] = {
1951 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1952 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1953 def_excpt(EXCEPTION_BREAKPOINT),
1954 def_excpt(EXCEPTION_SINGLE_STEP),
1955 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1956 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1957 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1958 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1959 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1960 def_excpt(EXCEPTION_FLT_OVERFLOW),
1961 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1962 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1963 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1964 def_excpt(EXCEPTION_INT_OVERFLOW),
1965 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1966 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1967 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1968 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1969 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1970 def_excpt(EXCEPTION_STACK_OVERFLOW),
1971 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1972 def_excpt(EXCEPTION_GUARD_PAGE),
1973 def_excpt(EXCEPTION_INVALID_HANDLE),
1974 NULL, 0
1975 };
1976
1977 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1978 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1979 if (exceptlabels[i].number == exception_code) {
1980 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1981 return buf;
1982 }
1983 }
1984
1985 return NULL;
1986 }
1987
1988 //-----------------------------------------------------------------------------
1989 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1990 // handle exception caused by idiv; should only happen for -MinInt/-1
1991 // (division by zero is handled explicitly)
1992 #ifdef _M_IA64
1993 assert(0, "Fix Handle_IDiv_Exception");
1994 #elif _M_AMD64
1995 PCONTEXT ctx = exceptionInfo->ContextRecord;
1996 address pc = (address)ctx->Rip;
1997 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1998 assert(pc[0] == 0xF7, "not an idiv opcode");
1999 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2000 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2001 // set correct result values and continue after idiv instruction
2002 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2003 ctx->Rax = (DWORD)min_jint; // result
2004 ctx->Rdx = (DWORD)0; // remainder
2005 // Continue the execution
2006 #else
2007 PCONTEXT ctx = exceptionInfo->ContextRecord;
2008 address pc = (address)ctx->Eip;
2009 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
2010 assert(pc[0] == 0xF7, "not an idiv opcode");
2011 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2012 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2013 // set correct result values and continue after idiv instruction
2014 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2015 ctx->Eax = (DWORD)min_jint; // result
2016 ctx->Edx = (DWORD)0; // remainder
2017 // Continue the execution
2018 #endif
2019 return EXCEPTION_CONTINUE_EXECUTION;
2020 }
2021
2022 #ifndef _WIN64
2023 //-----------------------------------------------------------------------------
2024 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2025 // handle exception caused by native method modifying control word
2026 PCONTEXT ctx = exceptionInfo->ContextRecord;
2027 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2028
2029 switch (exception_code) {
2030 case EXCEPTION_FLT_DENORMAL_OPERAND:
2031 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2032 case EXCEPTION_FLT_INEXACT_RESULT:
2033 case EXCEPTION_FLT_INVALID_OPERATION:
2034 case EXCEPTION_FLT_OVERFLOW:
2035 case EXCEPTION_FLT_STACK_CHECK:
2036 case EXCEPTION_FLT_UNDERFLOW:
2037 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2038 if (fp_control_word != ctx->FloatSave.ControlWord) {
2039 // Restore FPCW and mask out FLT exceptions
2040 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2041 // Mask out pending FLT exceptions
2042 ctx->FloatSave.StatusWord &= 0xffffff00;
2043 return EXCEPTION_CONTINUE_EXECUTION;
2044 }
2045 }
2046
2047 if (prev_uef_handler != NULL) {
2048 // We didn't handle this exception so pass it to the previous
2049 // UnhandledExceptionFilter.
2050 return (prev_uef_handler)(exceptionInfo);
2051 }
2052
2053 return EXCEPTION_CONTINUE_SEARCH;
2054 }
2055 #else //_WIN64
2056 /*
2057 On Windows, the mxcsr control bits are non-volatile across calls
2058 See also CR 6192333
2059 If EXCEPTION_FLT_* happened after some native method modified
2060 mxcsr - it is not a jvm fault.
2061 However should we decide to restore of mxcsr after a faulty
2062 native method we can uncomment following code
2063 jint MxCsr = INITIAL_MXCSR;
2064 // we can't use StubRoutines::addr_mxcsr_std()
2065 // because in Win64 mxcsr is not saved there
2066 if (MxCsr != ctx->MxCsr) {
2067 ctx->MxCsr = MxCsr;
2068 return EXCEPTION_CONTINUE_EXECUTION;
2069 }
2070
2071 */
2072 #endif //_WIN64
2073
2074
2075 // Fatal error reporting is single threaded so we can make this a
2076 // static and preallocated. If it's more than MAX_PATH silently ignore
2077 // it.
2078 static char saved_error_file[MAX_PATH] = {0};
2079
2080 void os::set_error_file(const char *logfile) {
2081 if (strlen(logfile) <= MAX_PATH) {
2082 strncpy(saved_error_file, logfile, MAX_PATH);
2083 }
2084 }
2085
2086 static inline void report_error(Thread* t, DWORD exception_code,
2087 address addr, void* siginfo, void* context) {
2088 VMError err(t, exception_code, addr, siginfo, context);
2089 err.report_and_die();
2090
2091 // If UseOsErrorReporting, this will return here and save the error file
2092 // somewhere where we can find it in the minidump.
2093 }
2094
2095 //-----------------------------------------------------------------------------
2096 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2097 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2098 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2099 #ifdef _M_IA64
2100 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2101 #elif _M_AMD64
2102 address pc = (address) exceptionInfo->ContextRecord->Rip;
2103 #else
2104 address pc = (address) exceptionInfo->ContextRecord->Eip;
2105 #endif
2106 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2107
2108 #ifndef _WIN64
2109 // Execution protection violation - win32 running on AMD64 only
2110 // Handled first to avoid misdiagnosis as a "normal" access violation;
2111 // This is safe to do because we have a new/unique ExceptionInformation
2112 // code for this condition.
2113 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2114 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2115 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2116 address addr = (address) exceptionRecord->ExceptionInformation[1];
2117
2118 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2119 int page_size = os::vm_page_size();
2120
2121 // Make sure the pc and the faulting address are sane.
2122 //
2123 // If an instruction spans a page boundary, and the page containing
2124 // the beginning of the instruction is executable but the following
2125 // page is not, the pc and the faulting address might be slightly
2126 // different - we still want to unguard the 2nd page in this case.
2127 //
2128 // 15 bytes seems to be a (very) safe value for max instruction size.
2129 bool pc_is_near_addr =
2130 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2131 bool instr_spans_page_boundary =
2132 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2133 (intptr_t) page_size) > 0);
2134
2135 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2136 static volatile address last_addr =
2137 (address) os::non_memory_address_word();
2138
2139 // In conservative mode, don't unguard unless the address is in the VM
2140 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2141 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2142
2143 // Set memory to RWX and retry
2144 address page_start =
2145 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2146 bool res = os::protect_memory((char*) page_start, page_size,
2147 os::MEM_PROT_RWX);
2148
2149 if (PrintMiscellaneous && Verbose) {
2150 char buf[256];
2151 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2152 "at " INTPTR_FORMAT
2153 ", unguarding " INTPTR_FORMAT ": %s", addr,
2154 page_start, (res ? "success" : strerror(errno)));
2155 tty->print_raw_cr(buf);
2156 }
2157
2158 // Set last_addr so if we fault again at the same address, we don't
2159 // end up in an endless loop.
2160 //
2161 // There are two potential complications here. Two threads trapping
2162 // at the same address at the same time could cause one of the
2163 // threads to think it already unguarded, and abort the VM. Likely
2164 // very rare.
2165 //
2166 // The other race involves two threads alternately trapping at
2167 // different addresses and failing to unguard the page, resulting in
2168 // an endless loop. This condition is probably even more unlikely
2169 // than the first.
2170 //
2171 // Although both cases could be avoided by using locks or thread
2172 // local last_addr, these solutions are unnecessary complication:
2173 // this handler is a best-effort safety net, not a complete solution.
2174 // It is disabled by default and should only be used as a workaround
2175 // in case we missed any no-execute-unsafe VM code.
2176
2177 last_addr = addr;
2178
2179 return EXCEPTION_CONTINUE_EXECUTION;
2180 }
2181 }
2182
2183 // Last unguard failed or not unguarding
2184 tty->print_raw_cr("Execution protection violation");
2185 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2186 exceptionInfo->ContextRecord);
2187 return EXCEPTION_CONTINUE_SEARCH;
2188 }
2189 }
2190 #endif // _WIN64
2191
2192 // Check to see if we caught the safepoint code in the
2193 // process of write protecting the memory serialization page.
2194 // It write enables the page immediately after protecting it
2195 // so just return.
2196 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2197 JavaThread* thread = (JavaThread*) t;
2198 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2199 address addr = (address) exceptionRecord->ExceptionInformation[1];
2200 if ( os::is_memory_serialize_page(thread, addr) ) {
2201 // Block current thread until the memory serialize page permission restored.
2202 os::block_on_serialize_page_trap();
2203 return EXCEPTION_CONTINUE_EXECUTION;
2204 }
2205 }
2206
2207
2208 if (t != NULL && t->is_Java_thread()) {
2209 JavaThread* thread = (JavaThread*) t;
2210 bool in_java = thread->thread_state() == _thread_in_Java;
2211
2212 // Handle potential stack overflows up front.
2213 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2214 if (os::uses_stack_guard_pages()) {
2215 #ifdef _M_IA64
2216 //
2217 // If it's a legal stack address continue, Windows will map it in.
2218 //
2219 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2220 address addr = (address) exceptionRecord->ExceptionInformation[1];
2221 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2222 return EXCEPTION_CONTINUE_EXECUTION;
2223
2224 // The register save area is the same size as the memory stack
2225 // and starts at the page just above the start of the memory stack.
2226 // If we get a fault in this area, we've run out of register
2227 // stack. If we are in java, try throwing a stack overflow exception.
2228 if (addr > thread->stack_base() &&
2229 addr <= (thread->stack_base()+thread->stack_size()) ) {
2230 char buf[256];
2231 jio_snprintf(buf, sizeof(buf),
2232 "Register stack overflow, addr:%p, stack_base:%p\n",
2233 addr, thread->stack_base() );
2234 tty->print_raw_cr(buf);
2235 // If not in java code, return and hope for the best.
2236 return in_java ? Handle_Exception(exceptionInfo,
2237 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2238 : EXCEPTION_CONTINUE_EXECUTION;
2239 }
2240 #endif
2241 if (thread->stack_yellow_zone_enabled()) {
2242 // Yellow zone violation. The o/s has unprotected the first yellow
2243 // zone page for us. Note: must call disable_stack_yellow_zone to
2244 // update the enabled status, even if the zone contains only one page.
2245 thread->disable_stack_yellow_zone();
2246 // If not in java code, return and hope for the best.
2247 return in_java ? Handle_Exception(exceptionInfo,
2248 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2249 : EXCEPTION_CONTINUE_EXECUTION;
2250 } else {
2251 // Fatal red zone violation.
2252 thread->disable_stack_red_zone();
2253 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2254 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2255 exceptionInfo->ContextRecord);
2256 return EXCEPTION_CONTINUE_SEARCH;
2257 }
2258 } else if (in_java) {
2259 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2260 // a one-time-only guard page, which it has released to us. The next
2261 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2262 return Handle_Exception(exceptionInfo,
2263 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2264 } else {
2265 // Can only return and hope for the best. Further stack growth will
2266 // result in an ACCESS_VIOLATION.
2267 return EXCEPTION_CONTINUE_EXECUTION;
2268 }
2269 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2270 // Either stack overflow or null pointer exception.
2271 if (in_java) {
2272 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2273 address addr = (address) exceptionRecord->ExceptionInformation[1];
2274 address stack_end = thread->stack_base() - thread->stack_size();
2275 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2276 // Stack overflow.
2277 assert(!os::uses_stack_guard_pages(),
2278 "should be caught by red zone code above.");
2279 return Handle_Exception(exceptionInfo,
2280 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2281 }
2282 //
2283 // Check for safepoint polling and implicit null
2284 // We only expect null pointers in the stubs (vtable)
2285 // the rest are checked explicitly now.
2286 //
2287 CodeBlob* cb = CodeCache::find_blob(pc);
2288 if (cb != NULL) {
2289 if (os::is_poll_address(addr)) {
2290 address stub = SharedRuntime::get_poll_stub(pc);
2291 return Handle_Exception(exceptionInfo, stub);
2292 }
2293 }
2294 {
2295 #ifdef _WIN64
2296 //
2297 // If it's a legal stack address map the entire region in
2298 //
2299 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2300 address addr = (address) exceptionRecord->ExceptionInformation[1];
2301 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2302 addr = (address)((uintptr_t)addr &
2303 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2304 os::commit_memory((char *)addr, thread->stack_base() - addr,
2305 false );
2306 return EXCEPTION_CONTINUE_EXECUTION;
2307 }
2308 else
2309 #endif
2310 {
2311 // Null pointer exception.
2312 #ifdef _M_IA64
2313 // We catch register stack overflows in compiled code by doing
2314 // an explicit compare and executing a st8(G0, G0) if the
2315 // BSP enters into our guard area. We test for the overflow
2316 // condition and fall into the normal null pointer exception
2317 // code if BSP hasn't overflowed.
2318 if ( in_java ) {
2319 if(thread->register_stack_overflow()) {
2320 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2321 thread->register_stack_limit(),
2322 "GR7 doesn't contain register_stack_limit");
2323 // Disable the yellow zone which sets the state that
2324 // we've got a stack overflow problem.
2325 if (thread->stack_yellow_zone_enabled()) {
2326 thread->disable_stack_yellow_zone();
2327 }
2328 // Give us some room to process the exception
2329 thread->disable_register_stack_guard();
2330 // Update GR7 with the new limit so we can continue running
2331 // compiled code.
2332 exceptionInfo->ContextRecord->IntS3 =
2333 (ULONGLONG)thread->register_stack_limit();
2334 return Handle_Exception(exceptionInfo,
2335 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2336 } else {
2337 //
2338 // Check for implicit null
2339 // We only expect null pointers in the stubs (vtable)
2340 // the rest are checked explicitly now.
2341 //
2342 if (((uintptr_t)addr) < os::vm_page_size() ) {
2343 // an access to the first page of VM--assume it is a null pointer
2344 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2345 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2346 }
2347 }
2348 } // in_java
2349
2350 // IA64 doesn't use implicit null checking yet. So we shouldn't
2351 // get here.
2352 tty->print_raw_cr("Access violation, possible null pointer exception");
2353 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2354 exceptionInfo->ContextRecord);
2355 return EXCEPTION_CONTINUE_SEARCH;
2356 #else /* !IA64 */
2357
2358 // Windows 98 reports faulting addresses incorrectly
2359 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2360 !os::win32::is_nt()) {
2361 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2362 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2363 }
2364 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2365 exceptionInfo->ContextRecord);
2366 return EXCEPTION_CONTINUE_SEARCH;
2367 #endif
2368 }
2369 }
2370 }
2371
2372 #ifdef _WIN64
2373 // Special care for fast JNI field accessors.
2374 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2375 // in and the heap gets shrunk before the field access.
2376 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2377 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2378 if (addr != (address)-1) {
2379 return Handle_Exception(exceptionInfo, addr);
2380 }
2381 }
2382 #endif
2383
2384 #ifdef _WIN64
2385 // Windows will sometimes generate an access violation
2386 // when we call malloc. Since we use VectoredExceptions
2387 // on 64 bit platforms, we see this exception. We must
2388 // pass this exception on so Windows can recover.
2389 // We check to see if the pc of the fault is in NTDLL.DLL
2390 // if so, we pass control on to Windows for handling.
2391 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2392 #endif
2393
2394 // Stack overflow or null pointer exception in native code.
2395 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2396 exceptionInfo->ContextRecord);
2397 return EXCEPTION_CONTINUE_SEARCH;
2398 }
2399
2400 if (in_java) {
2401 switch (exception_code) {
2402 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2403 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2404
2405 case EXCEPTION_INT_OVERFLOW:
2406 return Handle_IDiv_Exception(exceptionInfo);
2407
2408 } // switch
2409 }
2410 #ifndef _WIN64
2411 if ((thread->thread_state() == _thread_in_Java) ||
2412 (thread->thread_state() == _thread_in_native) )
2413 {
2414 LONG result=Handle_FLT_Exception(exceptionInfo);
2415 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2416 }
2417 #endif //_WIN64
2418 }
2419
2420 if (exception_code != EXCEPTION_BREAKPOINT) {
2421 #ifndef _WIN64
2422 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2423 exceptionInfo->ContextRecord);
2424 #else
2425 // Itanium Windows uses a VectoredExceptionHandler
2426 // Which means that C++ programatic exception handlers (try/except)
2427 // will get here. Continue the search for the right except block if
2428 // the exception code is not a fatal code.
2429 switch ( exception_code ) {
2430 case EXCEPTION_ACCESS_VIOLATION:
2431 case EXCEPTION_STACK_OVERFLOW:
2432 case EXCEPTION_ILLEGAL_INSTRUCTION:
2433 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2434 case EXCEPTION_INT_OVERFLOW:
2435 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2436 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2437 exceptionInfo->ContextRecord);
2438 }
2439 break;
2440 default:
2441 break;
2442 }
2443 #endif
2444 }
2445 return EXCEPTION_CONTINUE_SEARCH;
2446 }
2447
2448 #ifndef _WIN64
2449 // Special care for fast JNI accessors.
2450 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2451 // the heap gets shrunk before the field access.
2452 // Need to install our own structured exception handler since native code may
2453 // install its own.
2454 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2455 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2456 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2457 address pc = (address) exceptionInfo->ContextRecord->Eip;
2458 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2459 if (addr != (address)-1) {
2460 return Handle_Exception(exceptionInfo, addr);
2461 }
2462 }
2463 return EXCEPTION_CONTINUE_SEARCH;
2464 }
2465
2466 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2467 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2468 __try { \
2469 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2470 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2471 } \
2472 return 0; \
2473 }
2474
2475 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2476 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2477 DEFINE_FAST_GETFIELD(jchar, char, Char)
2478 DEFINE_FAST_GETFIELD(jshort, short, Short)
2479 DEFINE_FAST_GETFIELD(jint, int, Int)
2480 DEFINE_FAST_GETFIELD(jlong, long, Long)
2481 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2482 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2483
2484 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2485 switch (type) {
2486 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2487 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2488 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2489 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2490 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2491 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2492 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2493 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2494 default: ShouldNotReachHere();
2495 }
2496 return (address)-1;
2497 }
2498 #endif
2499
2500 // Virtual Memory
2501
2502 int os::vm_page_size() { return os::win32::vm_page_size(); }
2503 int os::vm_allocation_granularity() {
2504 return os::win32::vm_allocation_granularity();
2505 }
2506
2507 // Windows large page support is available on Windows 2003. In order to use
2508 // large page memory, the administrator must first assign additional privilege
2509 // to the user:
2510 // + select Control Panel -> Administrative Tools -> Local Security Policy
2511 // + select Local Policies -> User Rights Assignment
2512 // + double click "Lock pages in memory", add users and/or groups
2513 // + reboot
2514 // Note the above steps are needed for administrator as well, as administrators
2515 // by default do not have the privilege to lock pages in memory.
2516 //
2517 // Note about Windows 2003: although the API supports committing large page
2518 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2519 // scenario, I found through experiment it only uses large page if the entire
2520 // memory region is reserved and committed in a single VirtualAlloc() call.
2521 // This makes Windows large page support more or less like Solaris ISM, in
2522 // that the entire heap must be committed upfront. This probably will change
2523 // in the future, if so the code below needs to be revisited.
2524
2525 #ifndef MEM_LARGE_PAGES
2526 #define MEM_LARGE_PAGES 0x20000000
2527 #endif
2528
2529 // GetLargePageMinimum is only available on Windows 2003. The other functions
2530 // are available on NT but not on Windows 98/Me. We have to resolve them at
2531 // runtime.
2532 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2533 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2534 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2535 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2536 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2537
2538 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2539 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2540 static OpenProcessToken_func_type _OpenProcessToken;
2541 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2542
2543 static HINSTANCE _kernel32;
2544 static HINSTANCE _advapi32;
2545 static HANDLE _hProcess;
2546 static HANDLE _hToken;
2547
2548 static size_t _large_page_size = 0;
2549
2550 static bool resolve_functions_for_large_page_init() {
2551 _kernel32 = LoadLibrary("kernel32.dll");
2552 if (_kernel32 == NULL) return false;
2553
2554 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2555 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2556 if (_GetLargePageMinimum == NULL) return false;
2557
2558 _advapi32 = LoadLibrary("advapi32.dll");
2559 if (_advapi32 == NULL) return false;
2560
2561 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2562 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2563 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2564 GetProcAddress(_advapi32, "OpenProcessToken"));
2565 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2566 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2567 return _AdjustTokenPrivileges != NULL &&
2568 _OpenProcessToken != NULL &&
2569 _LookupPrivilegeValue != NULL;
2570 }
2571
2572 static bool request_lock_memory_privilege() {
2573 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2574 os::current_process_id());
2575
2576 LUID luid;
2577 if (_hProcess != NULL &&
2578 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2579 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2580
2581 TOKEN_PRIVILEGES tp;
2582 tp.PrivilegeCount = 1;
2583 tp.Privileges[0].Luid = luid;
2584 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2585
2586 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2587 // privilege. Check GetLastError() too. See MSDN document.
2588 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2589 (GetLastError() == ERROR_SUCCESS)) {
2590 return true;
2591 }
2592 }
2593
2594 return false;
2595 }
2596
2597 static void cleanup_after_large_page_init() {
2598 _GetLargePageMinimum = NULL;
2599 _AdjustTokenPrivileges = NULL;
2600 _OpenProcessToken = NULL;
2601 _LookupPrivilegeValue = NULL;
2602 if (_kernel32) FreeLibrary(_kernel32);
2603 _kernel32 = NULL;
2604 if (_advapi32) FreeLibrary(_advapi32);
2605 _advapi32 = NULL;
2606 if (_hProcess) CloseHandle(_hProcess);
2607 _hProcess = NULL;
2608 if (_hToken) CloseHandle(_hToken);
2609 _hToken = NULL;
2610 }
2611
2612 bool os::large_page_init() {
2613 if (!UseLargePages) return false;
2614
2615 // print a warning if any large page related flag is specified on command line
2616 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2617 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2618 bool success = false;
2619
2620 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2621 if (resolve_functions_for_large_page_init()) {
2622 if (request_lock_memory_privilege()) {
2623 size_t s = _GetLargePageMinimum();
2624 if (s) {
2625 #if defined(IA32) || defined(AMD64)
2626 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2627 WARN("JVM cannot use large pages bigger than 4mb.");
2628 } else {
2629 #endif
2630 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2631 _large_page_size = LargePageSizeInBytes;
2632 } else {
2633 _large_page_size = s;
2634 }
2635 success = true;
2636 #if defined(IA32) || defined(AMD64)
2637 }
2638 #endif
2639 } else {
2640 WARN("Large page is not supported by the processor.");
2641 }
2642 } else {
2643 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2644 }
2645 } else {
2646 WARN("Large page is not supported by the operating system.");
2647 }
2648 #undef WARN
2649
2650 const size_t default_page_size = (size_t) vm_page_size();
2651 if (success && _large_page_size > default_page_size) {
2652 _page_sizes[0] = _large_page_size;
2653 _page_sizes[1] = default_page_size;
2654 _page_sizes[2] = 0;
2655 }
2656
2657 cleanup_after_large_page_init();
2658 return success;
2659 }
2660
2661 // On win32, one cannot release just a part of reserved memory, it's an
2662 // all or nothing deal. When we split a reservation, we must break the
2663 // reservation into two reservations.
2664 void os::split_reserved_memory(char *base, size_t size, size_t split,
2665 bool realloc) {
2666 if (size > 0) {
2667 release_memory(base, size);
2668 if (realloc) {
2669 reserve_memory(split, base);
2670 }
2671 if (size != split) {
2672 reserve_memory(size - split, base + split);
2673 }
2674 }
2675 }
2676
2677 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2678 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2679 "reserve alignment");
2680 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2681 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2682 assert(res == NULL || addr == NULL || addr == res,
2683 "Unexpected address from reserve.");
2684 return res;
2685 }
2686
2687 // Reserve memory at an arbitrary address, only if that area is
2688 // available (and not reserved for something else).
2689 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2690 // Windows os::reserve_memory() fails of the requested address range is
2691 // not avilable.
2692 return reserve_memory(bytes, requested_addr);
2693 }
2694
2695 size_t os::large_page_size() {
2696 return _large_page_size;
2697 }
2698
2699 bool os::can_commit_large_page_memory() {
2700 // Windows only uses large page memory when the entire region is reserved
2701 // and committed in a single VirtualAlloc() call. This may change in the
2702 // future, but with Windows 2003 it's not possible to commit on demand.
2703 return false;
2704 }
2705
2706 bool os::can_execute_large_page_memory() {
2707 return true;
2708 }
2709
2710 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2711
2712 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2713
2714 if (UseLargePagesIndividualAllocation) {
2715 if (TracePageSizes && Verbose) {
2716 tty->print_cr("Reserving large pages individually.");
2717 }
2718 char * p_buf;
2719 // first reserve enough address space in advance since we want to be
2720 // able to break a single contiguous virtual address range into multiple
2721 // large page commits but WS2003 does not allow reserving large page space
2722 // so we just use 4K pages for reserve, this gives us a legal contiguous
2723 // address space. then we will deallocate that reservation, and re alloc
2724 // using large pages
2725 const size_t size_of_reserve = bytes + _large_page_size;
2726 if (bytes > size_of_reserve) {
2727 // Overflowed.
2728 warning("Individually allocated large pages failed, "
2729 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2730 return NULL;
2731 }
2732 p_buf = (char *) VirtualAlloc(addr,
2733 size_of_reserve, // size of Reserve
2734 MEM_RESERVE,
2735 PAGE_READWRITE);
2736 // If reservation failed, return NULL
2737 if (p_buf == NULL) return NULL;
2738
2739 release_memory(p_buf, bytes + _large_page_size);
2740 // round up to page boundary. If the size_of_reserve did not
2741 // overflow and the reservation did not fail, this align up
2742 // should not overflow.
2743 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2744
2745 // now go through and allocate one page at a time until all bytes are
2746 // allocated
2747 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2748 // An overflow of align_size_up() would have been caught above
2749 // in the calculation of size_of_reserve.
2750 char * next_alloc_addr = p_buf;
2751
2752 #ifdef ASSERT
2753 // Variable for the failure injection
2754 long ran_num = os::random();
2755 size_t fail_after = ran_num % bytes;
2756 #endif
2757
2758 while (bytes_remaining) {
2759 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2760 // Note allocate and commit
2761 char * p_new;
2762
2763 #ifdef ASSERT
2764 bool inject_error = LargePagesIndividualAllocationInjectError &&
2765 (bytes_remaining <= fail_after);
2766 #else
2767 const bool inject_error = false;
2768 #endif
2769
2770 if (inject_error) {
2771 p_new = NULL;
2772 } else {
2773 p_new = (char *) VirtualAlloc(next_alloc_addr,
2774 bytes_to_rq,
2775 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2776 prot);
2777 }
2778
2779 if (p_new == NULL) {
2780 // Free any allocated pages
2781 if (next_alloc_addr > p_buf) {
2782 // Some memory was committed so release it.
2783 size_t bytes_to_release = bytes - bytes_remaining;
2784 release_memory(p_buf, bytes_to_release);
2785 }
2786 #ifdef ASSERT
2787 if (UseLargePagesIndividualAllocation &&
2788 LargePagesIndividualAllocationInjectError) {
2789 if (TracePageSizes && Verbose) {
2790 tty->print_cr("Reserving large pages individually failed.");
2791 }
2792 }
2793 #endif
2794 return NULL;
2795 }
2796 bytes_remaining -= bytes_to_rq;
2797 next_alloc_addr += bytes_to_rq;
2798 }
2799
2800 return p_buf;
2801
2802 } else {
2803 // normal policy just allocate it all at once
2804 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2805 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2806 return res;
2807 }
2808 }
2809
2810 bool os::release_memory_special(char* base, size_t bytes) {
2811 return release_memory(base, bytes);
2812 }
2813
2814 void os::print_statistics() {
2815 }
2816
2817 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2818 if (bytes == 0) {
2819 // Don't bother the OS with noops.
2820 return true;
2821 }
2822 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2823 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2824 // Don't attempt to print anything if the OS call fails. We're
2825 // probably low on resources, so the print itself may cause crashes.
2826 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2827 if (result != NULL && exec) {
2828 DWORD oldprot;
2829 // Windows doc says to use VirtualProtect to get execute permissions
2830 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2831 } else {
2832 return result;
2833 }
2834 }
2835
2836 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2837 bool exec) {
2838 return commit_memory(addr, size, exec);
2839 }
2840
2841 bool os::uncommit_memory(char* addr, size_t bytes) {
2842 if (bytes == 0) {
2843 // Don't bother the OS with noops.
2844 return true;
2845 }
2846 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2847 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2848 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2849 }
2850
2851 bool os::release_memory(char* addr, size_t bytes) {
2852 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2853 }
2854
2855 bool os::create_stack_guard_pages(char* addr, size_t size) {
2856 return os::commit_memory(addr, size);
2857 }
2858
2859 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2860 return os::uncommit_memory(addr, size);
2861 }
2862
2863 // Set protections specified
2864 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2865 bool is_committed) {
2866 unsigned int p = 0;
2867 switch (prot) {
2868 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2869 case MEM_PROT_READ: p = PAGE_READONLY; break;
2870 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2871 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2872 default:
2873 ShouldNotReachHere();
2874 }
2875
2876 DWORD old_status;
2877
2878 // Strange enough, but on Win32 one can change protection only for committed
2879 // memory, not a big deal anyway, as bytes less or equal than 64K
2880 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
2881 fatal("cannot commit protection page");
2882 }
2883 // One cannot use os::guard_memory() here, as on Win32 guard page
2884 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2885 //
2886 // Pages in the region become guard pages. Any attempt to access a guard page
2887 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2888 // the guard page status. Guard pages thus act as a one-time access alarm.
2889 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2890 }
2891
2892 bool os::guard_memory(char* addr, size_t bytes) {
2893 DWORD old_status;
2894 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
2895 }
2896
2897 bool os::unguard_memory(char* addr, size_t bytes) {
2898 DWORD old_status;
2899 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
2900 }
2901
2902 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2903 void os::free_memory(char *addr, size_t bytes) { }
2904 void os::numa_make_global(char *addr, size_t bytes) { }
2905 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2906 bool os::numa_topology_changed() { return false; }
2907 size_t os::numa_get_groups_num() { return 1; }
2908 int os::numa_get_group_id() { return 0; }
2909 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2910 if (size > 0) {
2911 ids[0] = 0;
2912 return 1;
2913 }
2914 return 0;
2915 }
2916
2917 bool os::get_page_info(char *start, page_info* info) {
2918 return false;
2919 }
2920
2921 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2922 return end;
2923 }
2924
2925 char* os::non_memory_address_word() {
2926 // Must never look like an address returned by reserve_memory,
2927 // even in its subfields (as defined by the CPU immediate fields,
2928 // if the CPU splits constants across multiple instructions).
2929 return (char*)-1;
2930 }
2931
2932 #define MAX_ERROR_COUNT 100
2933 #define SYS_THREAD_ERROR 0xffffffffUL
2934
2935 void os::pd_start_thread(Thread* thread) {
2936 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2937 // Returns previous suspend state:
2938 // 0: Thread was not suspended
2939 // 1: Thread is running now
2940 // >1: Thread is still suspended.
2941 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2942 }
2943
2944 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2945 return ::read(fd, buf, nBytes);
2946 }
2947
2948 class HighResolutionInterval {
2949 // The default timer resolution seems to be 10 milliseconds.
2950 // (Where is this written down?)
2951 // If someone wants to sleep for only a fraction of the default,
2952 // then we set the timer resolution down to 1 millisecond for
2953 // the duration of their interval.
2954 // We carefully set the resolution back, since otherwise we
2955 // seem to incur an overhead (3%?) that we don't need.
2956 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2957 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2958 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2959 // timeBeginPeriod() if the relative error exceeded some threshold.
2960 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2961 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2962 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2963 // resolution timers running.
2964 private:
2965 jlong resolution;
2966 public:
2967 HighResolutionInterval(jlong ms) {
2968 resolution = ms % 10L;
2969 if (resolution != 0) {
2970 MMRESULT result = timeBeginPeriod(1L);
2971 }
2972 }
2973 ~HighResolutionInterval() {
2974 if (resolution != 0) {
2975 MMRESULT result = timeEndPeriod(1L);
2976 }
2977 resolution = 0L;
2978 }
2979 };
2980
2981 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2982 jlong limit = (jlong) MAXDWORD;
2983
2984 while(ms > limit) {
2985 int res;
2986 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2987 return res;
2988 ms -= limit;
2989 }
2990
2991 assert(thread == Thread::current(), "thread consistency check");
2992 OSThread* osthread = thread->osthread();
2993 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2994 int result;
2995 if (interruptable) {
2996 assert(thread->is_Java_thread(), "must be java thread");
2997 JavaThread *jt = (JavaThread *) thread;
2998 ThreadBlockInVM tbivm(jt);
2999
3000 jt->set_suspend_equivalent();
3001 // cleared by handle_special_suspend_equivalent_condition() or
3002 // java_suspend_self() via check_and_wait_while_suspended()
3003
3004 HANDLE events[1];
3005 events[0] = osthread->interrupt_event();
3006 HighResolutionInterval *phri=NULL;
3007 if(!ForceTimeHighResolution)
3008 phri = new HighResolutionInterval( ms );
3009 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3010 result = OS_TIMEOUT;
3011 } else {
3012 ResetEvent(osthread->interrupt_event());
3013 osthread->set_interrupted(false);
3014 result = OS_INTRPT;
3015 }
3016 delete phri; //if it is NULL, harmless
3017
3018 // were we externally suspended while we were waiting?
3019 jt->check_and_wait_while_suspended();
3020 } else {
3021 assert(!thread->is_Java_thread(), "must not be java thread");
3022 Sleep((long) ms);
3023 result = OS_TIMEOUT;
3024 }
3025 return result;
3026 }
3027
3028 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3029 void os::infinite_sleep() {
3030 while (true) { // sleep forever ...
3031 Sleep(100000); // ... 100 seconds at a time
3032 }
3033 }
3034
3035 typedef BOOL (WINAPI * STTSignature)(void) ;
3036
3037 os::YieldResult os::NakedYield() {
3038 // Use either SwitchToThread() or Sleep(0)
3039 // Consider passing back the return value from SwitchToThread().
3040 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
3041 // In that case we revert to Sleep(0).
3042 static volatile STTSignature stt = (STTSignature) 1 ;
3043
3044 if (stt == ((STTSignature) 1)) {
3045 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
3046 // It's OK if threads race during initialization as the operation above is idempotent.
3047 }
3048 if (stt != NULL) {
3049 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3050 } else {
3051 Sleep (0) ;
3052 }
3053 return os::YIELD_UNKNOWN ;
3054 }
3055
3056 void os::yield() { os::NakedYield(); }
3057
3058 void os::yield_all(int attempts) {
3059 // Yields to all threads, including threads with lower priorities
3060 Sleep(1);
3061 }
3062
3063 // Win32 only gives you access to seven real priorities at a time,
3064 // so we compress Java's ten down to seven. It would be better
3065 // if we dynamically adjusted relative priorities.
3066
3067 int os::java_to_os_priority[MaxPriority + 1] = {
3068 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3069 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3070 THREAD_PRIORITY_LOWEST, // 2
3071 THREAD_PRIORITY_BELOW_NORMAL, // 3
3072 THREAD_PRIORITY_BELOW_NORMAL, // 4
3073 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3074 THREAD_PRIORITY_NORMAL, // 6
3075 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3076 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3077 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3078 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3079 };
3080
3081 int prio_policy1[MaxPriority + 1] = {
3082 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3083 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3084 THREAD_PRIORITY_LOWEST, // 2
3085 THREAD_PRIORITY_BELOW_NORMAL, // 3
3086 THREAD_PRIORITY_BELOW_NORMAL, // 4
3087 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3088 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3089 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3090 THREAD_PRIORITY_HIGHEST, // 8
3091 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3092 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3093 };
3094
3095 static int prio_init() {
3096 // If ThreadPriorityPolicy is 1, switch tables
3097 if (ThreadPriorityPolicy == 1) {
3098 int i;
3099 for (i = 0; i < MaxPriority + 1; i++) {
3100 os::java_to_os_priority[i] = prio_policy1[i];
3101 }
3102 }
3103 return 0;
3104 }
3105
3106 OSReturn os::set_native_priority(Thread* thread, int priority) {
3107 if (!UseThreadPriorities) return OS_OK;
3108 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3109 return ret ? OS_OK : OS_ERR;
3110 }
3111
3112 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3113 if ( !UseThreadPriorities ) {
3114 *priority_ptr = java_to_os_priority[NormPriority];
3115 return OS_OK;
3116 }
3117 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3118 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3119 assert(false, "GetThreadPriority failed");
3120 return OS_ERR;
3121 }
3122 *priority_ptr = os_prio;
3123 return OS_OK;
3124 }
3125
3126
3127 // Hint to the underlying OS that a task switch would not be good.
3128 // Void return because it's a hint and can fail.
3129 void os::hint_no_preempt() {}
3130
3131 void os::interrupt(Thread* thread) {
3132 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3133 "possibility of dangling Thread pointer");
3134
3135 OSThread* osthread = thread->osthread();
3136 osthread->set_interrupted(true);
3137 // More than one thread can get here with the same value of osthread,
3138 // resulting in multiple notifications. We do, however, want the store
3139 // to interrupted() to be visible to other threads before we post
3140 // the interrupt event.
3141 OrderAccess::release();
3142 SetEvent(osthread->interrupt_event());
3143 // For JSR166: unpark after setting status
3144 if (thread->is_Java_thread())
3145 ((JavaThread*)thread)->parker()->unpark();
3146
3147 ParkEvent * ev = thread->_ParkEvent ;
3148 if (ev != NULL) ev->unpark() ;
3149
3150 }
3151
3152
3153 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3154 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3155 "possibility of dangling Thread pointer");
3156
3157 OSThread* osthread = thread->osthread();
3158 bool interrupted;
3159 interrupted = osthread->interrupted();
3160 if (clear_interrupted == true) {
3161 osthread->set_interrupted(false);
3162 ResetEvent(osthread->interrupt_event());
3163 } // Otherwise leave the interrupted state alone
3164
3165 return interrupted;
3166 }
3167
3168 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3169 ExtendedPC os::get_thread_pc(Thread* thread) {
3170 CONTEXT context;
3171 context.ContextFlags = CONTEXT_CONTROL;
3172 HANDLE handle = thread->osthread()->thread_handle();
3173 #ifdef _M_IA64
3174 assert(0, "Fix get_thread_pc");
3175 return ExtendedPC(NULL);
3176 #else
3177 if (GetThreadContext(handle, &context)) {
3178 #ifdef _M_AMD64
3179 return ExtendedPC((address) context.Rip);
3180 #else
3181 return ExtendedPC((address) context.Eip);
3182 #endif
3183 } else {
3184 return ExtendedPC(NULL);
3185 }
3186 #endif
3187 }
3188
3189 // GetCurrentThreadId() returns DWORD
3190 intx os::current_thread_id() { return GetCurrentThreadId(); }
3191
3192 static int _initial_pid = 0;
3193
3194 int os::current_process_id()
3195 {
3196 return (_initial_pid ? _initial_pid : _getpid());
3197 }
3198
3199 int os::win32::_vm_page_size = 0;
3200 int os::win32::_vm_allocation_granularity = 0;
3201 int os::win32::_processor_type = 0;
3202 // Processor level is not available on non-NT systems, use vm_version instead
3203 int os::win32::_processor_level = 0;
3204 julong os::win32::_physical_memory = 0;
3205 size_t os::win32::_default_stack_size = 0;
3206
3207 intx os::win32::_os_thread_limit = 0;
3208 volatile intx os::win32::_os_thread_count = 0;
3209
3210 bool os::win32::_is_nt = false;
3211 bool os::win32::_is_windows_2003 = false;
3212
3213
3214 void os::win32::initialize_system_info() {
3215 SYSTEM_INFO si;
3216 GetSystemInfo(&si);
3217 _vm_page_size = si.dwPageSize;
3218 _vm_allocation_granularity = si.dwAllocationGranularity;
3219 _processor_type = si.dwProcessorType;
3220 _processor_level = si.wProcessorLevel;
3221 set_processor_count(si.dwNumberOfProcessors);
3222
3223 MEMORYSTATUSEX ms;
3224 ms.dwLength = sizeof(ms);
3225
3226 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3227 // dwMemoryLoad (% of memory in use)
3228 GlobalMemoryStatusEx(&ms);
3229 _physical_memory = ms.ullTotalPhys;
3230
3231 OSVERSIONINFO oi;
3232 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3233 GetVersionEx(&oi);
3234 switch(oi.dwPlatformId) {
3235 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3236 case VER_PLATFORM_WIN32_NT:
3237 _is_nt = true;
3238 {
3239 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3240 if (os_vers == 5002) {
3241 _is_windows_2003 = true;
3242 }
3243 }
3244 break;
3245 default: fatal("Unknown platform");
3246 }
3247
3248 _default_stack_size = os::current_stack_size();
3249 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3250 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3251 "stack size not a multiple of page size");
3252
3253 initialize_performance_counter();
3254
3255 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3256 // known to deadlock the system, if the VM issues to thread operations with
3257 // a too high frequency, e.g., such as changing the priorities.
3258 // The 6000 seems to work well - no deadlocks has been notices on the test
3259 // programs that we have seen experience this problem.
3260 if (!os::win32::is_nt()) {
3261 StarvationMonitorInterval = 6000;
3262 }
3263 }
3264
3265
3266 void os::win32::setmode_streams() {
3267 _setmode(_fileno(stdin), _O_BINARY);
3268 _setmode(_fileno(stdout), _O_BINARY);
3269 _setmode(_fileno(stderr), _O_BINARY);
3270 }
3271
3272
3273 int os::message_box(const char* title, const char* message) {
3274 int result = MessageBox(NULL, message, title,
3275 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3276 return result == IDYES;
3277 }
3278
3279 int os::allocate_thread_local_storage() {
3280 return TlsAlloc();
3281 }
3282
3283
3284 void os::free_thread_local_storage(int index) {
3285 TlsFree(index);
3286 }
3287
3288
3289 void os::thread_local_storage_at_put(int index, void* value) {
3290 TlsSetValue(index, value);
3291 assert(thread_local_storage_at(index) == value, "Just checking");
3292 }
3293
3294
3295 void* os::thread_local_storage_at(int index) {
3296 return TlsGetValue(index);
3297 }
3298
3299
3300 #ifndef PRODUCT
3301 #ifndef _WIN64
3302 // Helpers to check whether NX protection is enabled
3303 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3304 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3305 pex->ExceptionRecord->NumberParameters > 0 &&
3306 pex->ExceptionRecord->ExceptionInformation[0] ==
3307 EXCEPTION_INFO_EXEC_VIOLATION) {
3308 return EXCEPTION_EXECUTE_HANDLER;
3309 }
3310 return EXCEPTION_CONTINUE_SEARCH;
3311 }
3312
3313 void nx_check_protection() {
3314 // If NX is enabled we'll get an exception calling into code on the stack
3315 char code[] = { (char)0xC3 }; // ret
3316 void *code_ptr = (void *)code;
3317 __try {
3318 __asm call code_ptr
3319 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3320 tty->print_raw_cr("NX protection detected.");
3321 }
3322 }
3323 #endif // _WIN64
3324 #endif // PRODUCT
3325
3326 // this is called _before_ the global arguments have been parsed
3327 void os::init(void) {
3328 _initial_pid = _getpid();
3329
3330 init_random(1234567);
3331
3332 win32::initialize_system_info();
3333 win32::setmode_streams();
3334 init_page_sizes((size_t) win32::vm_page_size());
3335
3336 // For better scalability on MP systems (must be called after initialize_system_info)
3337 #ifndef PRODUCT
3338 if (is_MP()) {
3339 NoYieldsInMicrolock = true;
3340 }
3341 #endif
3342 // This may be overridden later when argument processing is done.
3343 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3344 os::win32::is_windows_2003());
3345
3346 // Initialize main_process and main_thread
3347 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3348 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3349 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3350 fatal("DuplicateHandle failed\n");
3351 }
3352 main_thread_id = (int) GetCurrentThreadId();
3353 }
3354
3355 // To install functions for atexit processing
3356 extern "C" {
3357 static void perfMemory_exit_helper() {
3358 perfMemory_exit();
3359 }
3360 }
3361
3362 // this is called _after_ the global arguments have been parsed
3363 jint os::init_2(void) {
3364 // Allocate a single page and mark it as readable for safepoint polling
3365 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3366 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3367
3368 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3369 guarantee( return_page != NULL, "Commit Failed for polling page");
3370
3371 os::set_polling_page( polling_page );
3372
3373 #ifndef PRODUCT
3374 if( Verbose && PrintMiscellaneous )
3375 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3376 #endif
3377
3378 if (!UseMembar) {
3379 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3380 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3381
3382 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3383 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3384
3385 os::set_memory_serialize_page( mem_serialize_page );
3386
3387 #ifndef PRODUCT
3388 if(Verbose && PrintMiscellaneous)
3389 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3390 #endif
3391 }
3392
3393 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3394
3395 // Setup Windows Exceptions
3396
3397 // On Itanium systems, Structured Exception Handling does not
3398 // work since stack frames must be walkable by the OS. Since
3399 // much of our code is dynamically generated, and we do not have
3400 // proper unwind .xdata sections, the system simply exits
3401 // rather than delivering the exception. To work around
3402 // this we use VectorExceptions instead.
3403 #ifdef _WIN64
3404 if (UseVectoredExceptions) {
3405 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3406 }
3407 #endif
3408
3409 // for debugging float code generation bugs
3410 if (ForceFloatExceptions) {
3411 #ifndef _WIN64
3412 static long fp_control_word = 0;
3413 __asm { fstcw fp_control_word }
3414 // see Intel PPro Manual, Vol. 2, p 7-16
3415 const long precision = 0x20;
3416 const long underflow = 0x10;
3417 const long overflow = 0x08;
3418 const long zero_div = 0x04;
3419 const long denorm = 0x02;
3420 const long invalid = 0x01;
3421 fp_control_word |= invalid;
3422 __asm { fldcw fp_control_word }
3423 #endif
3424 }
3425
3426 // Initialize HPI.
3427 jint hpi_result = hpi::initialize();
3428 if (hpi_result != JNI_OK) { return hpi_result; }
3429
3430 // If stack_commit_size is 0, windows will reserve the default size,
3431 // but only commit a small portion of it.
3432 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3433 size_t default_reserve_size = os::win32::default_stack_size();
3434 size_t actual_reserve_size = stack_commit_size;
3435 if (stack_commit_size < default_reserve_size) {
3436 // If stack_commit_size == 0, we want this too
3437 actual_reserve_size = default_reserve_size;
3438 }
3439
3440 // Check minimum allowable stack size for thread creation and to initialize
3441 // the java system classes, including StackOverflowError - depends on page
3442 // size. Add a page for compiler2 recursion in main thread.
3443 // Add in 2*BytesPerWord times page size to account for VM stack during
3444 // class initialization depending on 32 or 64 bit VM.
3445 size_t min_stack_allowed =
3446 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3447 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3448 if (actual_reserve_size < min_stack_allowed) {
3449 tty->print_cr("\nThe stack size specified is too small, "
3450 "Specify at least %dk",
3451 min_stack_allowed / K);
3452 return JNI_ERR;
3453 }
3454
3455 JavaThread::set_stack_size_at_create(stack_commit_size);
3456
3457 // Calculate theoretical max. size of Threads to guard gainst artifical
3458 // out-of-memory situations, where all available address-space has been
3459 // reserved by thread stacks.
3460 assert(actual_reserve_size != 0, "Must have a stack");
3461
3462 // Calculate the thread limit when we should start doing Virtual Memory
3463 // banging. Currently when the threads will have used all but 200Mb of space.
3464 //
3465 // TODO: consider performing a similar calculation for commit size instead
3466 // as reserve size, since on a 64-bit platform we'll run into that more
3467 // often than running out of virtual memory space. We can use the
3468 // lower value of the two calculations as the os_thread_limit.
3469 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3470 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3471
3472 // at exit methods are called in the reverse order of their registration.
3473 // there is no limit to the number of functions registered. atexit does
3474 // not set errno.
3475
3476 if (PerfAllowAtExitRegistration) {
3477 // only register atexit functions if PerfAllowAtExitRegistration is set.
3478 // atexit functions can be delayed until process exit time, which
3479 // can be problematic for embedded VM situations. Embedded VMs should
3480 // call DestroyJavaVM() to assure that VM resources are released.
3481
3482 // note: perfMemory_exit_helper atexit function may be removed in
3483 // the future if the appropriate cleanup code can be added to the
3484 // VM_Exit VMOperation's doit method.
3485 if (atexit(perfMemory_exit_helper) != 0) {
3486 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3487 }
3488 }
3489
3490 // initialize PSAPI or ToolHelp for fatal error handler
3491 if (win32::is_nt()) _init_psapi();
3492 else _init_toolhelp();
3493
3494 #ifndef _WIN64
3495 // Print something if NX is enabled (win32 on AMD64)
3496 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3497 #endif
3498
3499 // initialize thread priority policy
3500 prio_init();
3501
3502 if (UseNUMA && !ForceNUMA) {
3503 UseNUMA = false; // Currently unsupported.
3504 }
3505
3506 return JNI_OK;
3507 }
3508
3509 void os::init_3(void) {
3510 return;
3511 }
3512
3513 // Mark the polling page as unreadable
3514 void os::make_polling_page_unreadable(void) {
3515 DWORD old_status;
3516 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3517 fatal("Could not disable polling page");
3518 };
3519
3520 // Mark the polling page as readable
3521 void os::make_polling_page_readable(void) {
3522 DWORD old_status;
3523 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3524 fatal("Could not enable polling page");
3525 };
3526
3527
3528 int os::stat(const char *path, struct stat *sbuf) {
3529 char pathbuf[MAX_PATH];
3530 if (strlen(path) > MAX_PATH - 1) {
3531 errno = ENAMETOOLONG;
3532 return -1;
3533 }
3534 hpi::native_path(strcpy(pathbuf, path));
3535 int ret = ::stat(pathbuf, sbuf);
3536 if (sbuf != NULL && UseUTCFileTimestamp) {
3537 // Fix for 6539723. st_mtime returned from stat() is dependent on
3538 // the system timezone and so can return different values for the
3539 // same file if/when daylight savings time changes. This adjustment
3540 // makes sure the same timestamp is returned regardless of the TZ.
3541 //
3542 // See:
3543 // http://msdn.microsoft.com/library/
3544 // default.asp?url=/library/en-us/sysinfo/base/
3545 // time_zone_information_str.asp
3546 // and
3547 // http://msdn.microsoft.com/library/default.asp?url=
3548 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3549 //
3550 // NOTE: there is a insidious bug here: If the timezone is changed
3551 // after the call to stat() but before 'GetTimeZoneInformation()', then
3552 // the adjustment we do here will be wrong and we'll return the wrong
3553 // value (which will likely end up creating an invalid class data
3554 // archive). Absent a better API for this, or some time zone locking
3555 // mechanism, we'll have to live with this risk.
3556 TIME_ZONE_INFORMATION tz;
3557 DWORD tzid = GetTimeZoneInformation(&tz);
3558 int daylightBias =
3559 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3560 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3561 }
3562 return ret;
3563 }
3564
3565
3566 #define FT2INT64(ft) \
3567 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3568
3569
3570 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3571 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3572 // of a thread.
3573 //
3574 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3575 // the fast estimate available on the platform.
3576
3577 // current_thread_cpu_time() is not optimized for Windows yet
3578 jlong os::current_thread_cpu_time() {
3579 // return user + sys since the cost is the same
3580 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3581 }
3582
3583 jlong os::thread_cpu_time(Thread* thread) {
3584 // consistent with what current_thread_cpu_time() returns.
3585 return os::thread_cpu_time(thread, true /* user+sys */);
3586 }
3587
3588 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3589 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3590 }
3591
3592 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3593 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3594 // If this function changes, os::is_thread_cpu_time_supported() should too
3595 if (os::win32::is_nt()) {
3596 FILETIME CreationTime;
3597 FILETIME ExitTime;
3598 FILETIME KernelTime;
3599 FILETIME UserTime;
3600
3601 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3602 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3603 return -1;
3604 else
3605 if (user_sys_cpu_time) {
3606 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3607 } else {
3608 return FT2INT64(UserTime) * 100;
3609 }
3610 } else {
3611 return (jlong) timeGetTime() * 1000000;
3612 }
3613 }
3614
3615 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3616 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3617 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3618 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3619 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3620 }
3621
3622 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3623 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3624 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3625 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3626 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3627 }
3628
3629 bool os::is_thread_cpu_time_supported() {
3630 // see os::thread_cpu_time
3631 if (os::win32::is_nt()) {
3632 FILETIME CreationTime;
3633 FILETIME ExitTime;
3634 FILETIME KernelTime;
3635 FILETIME UserTime;
3636
3637 if ( GetThreadTimes(GetCurrentThread(),
3638 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3639 return false;
3640 else
3641 return true;
3642 } else {
3643 return false;
3644 }
3645 }
3646
3647 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3648 // It does have primitives (PDH API) to get CPU usage and run queue length.
3649 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3650 // If we wanted to implement loadavg on Windows, we have a few options:
3651 //
3652 // a) Query CPU usage and run queue length and "fake" an answer by
3653 // returning the CPU usage if it's under 100%, and the run queue
3654 // length otherwise. It turns out that querying is pretty slow
3655 // on Windows, on the order of 200 microseconds on a fast machine.
3656 // Note that on the Windows the CPU usage value is the % usage
3657 // since the last time the API was called (and the first call
3658 // returns 100%), so we'd have to deal with that as well.
3659 //
3660 // b) Sample the "fake" answer using a sampling thread and store
3661 // the answer in a global variable. The call to loadavg would
3662 // just return the value of the global, avoiding the slow query.
3663 //
3664 // c) Sample a better answer using exponential decay to smooth the
3665 // value. This is basically the algorithm used by UNIX kernels.
3666 //
3667 // Note that sampling thread starvation could affect both (b) and (c).
3668 int os::loadavg(double loadavg[], int nelem) {
3669 return -1;
3670 }
3671
3672
3673 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3674 bool os::dont_yield() {
3675 return DontYieldALot;
3676 }
3677
3678 // Is a (classpath) directory empty?
3679 bool os::dir_is_empty(const char* path) {
3680 WIN32_FIND_DATA fd;
3681 HANDLE f = FindFirstFile(path, &fd);
3682 if (f == INVALID_HANDLE_VALUE) {
3683 return true;
3684 }
3685 FindClose(f);
3686 return false;
3687 }
3688
3689 // create binary file, rewriting existing file if required
3690 int os::create_binary_file(const char* path, bool rewrite_existing) {
3691 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3692 if (!rewrite_existing) {
3693 oflags |= _O_EXCL;
3694 }
3695 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3696 }
3697
3698 // return current position of file pointer
3699 jlong os::current_file_offset(int fd) {
3700 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3701 }
3702
3703 // move file pointer to the specified offset
3704 jlong os::seek_to_file_offset(int fd, jlong offset) {
3705 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3706 }
3707
3708
3709 // Map a block of memory.
3710 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3711 char *addr, size_t bytes, bool read_only,
3712 bool allow_exec) {
3713 HANDLE hFile;
3714 char* base;
3715
3716 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3717 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3718 if (hFile == NULL) {
3719 if (PrintMiscellaneous && Verbose) {
3720 DWORD err = GetLastError();
3721 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3722 }
3723 return NULL;
3724 }
3725
3726 if (allow_exec) {
3727 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3728 // unless it comes from a PE image (which the shared archive is not.)
3729 // Even VirtualProtect refuses to give execute access to mapped memory
3730 // that was not previously executable.
3731 //
3732 // Instead, stick the executable region in anonymous memory. Yuck.
3733 // Penalty is that ~4 pages will not be shareable - in the future
3734 // we might consider DLLizing the shared archive with a proper PE
3735 // header so that mapping executable + sharing is possible.
3736
3737 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3738 PAGE_READWRITE);
3739 if (base == NULL) {
3740 if (PrintMiscellaneous && Verbose) {
3741 DWORD err = GetLastError();
3742 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3743 }
3744 CloseHandle(hFile);
3745 return NULL;
3746 }
3747
3748 DWORD bytes_read;
3749 OVERLAPPED overlapped;
3750 overlapped.Offset = (DWORD)file_offset;
3751 overlapped.OffsetHigh = 0;
3752 overlapped.hEvent = NULL;
3753 // ReadFile guarantees that if the return value is true, the requested
3754 // number of bytes were read before returning.
3755 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3756 if (!res) {
3757 if (PrintMiscellaneous && Verbose) {
3758 DWORD err = GetLastError();
3759 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3760 }
3761 release_memory(base, bytes);
3762 CloseHandle(hFile);
3763 return NULL;
3764 }
3765 } else {
3766 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3767 NULL /*file_name*/);
3768 if (hMap == NULL) {
3769 if (PrintMiscellaneous && Verbose) {
3770 DWORD err = GetLastError();
3771 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3772 }
3773 CloseHandle(hFile);
3774 return NULL;
3775 }
3776
3777 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3778 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3779 (DWORD)bytes, addr);
3780 if (base == NULL) {
3781 if (PrintMiscellaneous && Verbose) {
3782 DWORD err = GetLastError();
3783 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3784 }
3785 CloseHandle(hMap);
3786 CloseHandle(hFile);
3787 return NULL;
3788 }
3789
3790 if (CloseHandle(hMap) == 0) {
3791 if (PrintMiscellaneous && Verbose) {
3792 DWORD err = GetLastError();
3793 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3794 }
3795 CloseHandle(hFile);
3796 return base;
3797 }
3798 }
3799
3800 if (allow_exec) {
3801 DWORD old_protect;
3802 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3803 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3804
3805 if (!res) {
3806 if (PrintMiscellaneous && Verbose) {
3807 DWORD err = GetLastError();
3808 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3809 }
3810 // Don't consider this a hard error, on IA32 even if the
3811 // VirtualProtect fails, we should still be able to execute
3812 CloseHandle(hFile);
3813 return base;
3814 }
3815 }
3816
3817 if (CloseHandle(hFile) == 0) {
3818 if (PrintMiscellaneous && Verbose) {
3819 DWORD err = GetLastError();
3820 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3821 }
3822 return base;
3823 }
3824
3825 return base;
3826 }
3827
3828
3829 // Remap a block of memory.
3830 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3831 char *addr, size_t bytes, bool read_only,
3832 bool allow_exec) {
3833 // This OS does not allow existing memory maps to be remapped so we
3834 // have to unmap the memory before we remap it.
3835 if (!os::unmap_memory(addr, bytes)) {
3836 return NULL;
3837 }
3838
3839 // There is a very small theoretical window between the unmap_memory()
3840 // call above and the map_memory() call below where a thread in native
3841 // code may be able to access an address that is no longer mapped.
3842
3843 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3844 allow_exec);
3845 }
3846
3847
3848 // Unmap a block of memory.
3849 // Returns true=success, otherwise false.
3850
3851 bool os::unmap_memory(char* addr, size_t bytes) {
3852 BOOL result = UnmapViewOfFile(addr);
3853 if (result == 0) {
3854 if (PrintMiscellaneous && Verbose) {
3855 DWORD err = GetLastError();
3856 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3857 }
3858 return false;
3859 }
3860 return true;
3861 }
3862
3863 void os::pause() {
3864 char filename[MAX_PATH];
3865 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3866 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3867 } else {
3868 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3869 }
3870
3871 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3872 if (fd != -1) {
3873 struct stat buf;
3874 close(fd);
3875 while (::stat(filename, &buf) == 0) {
3876 Sleep(100);
3877 }
3878 } else {
3879 jio_fprintf(stderr,
3880 "Could not open pause file '%s', continuing immediately.\n", filename);
3881 }
3882 }
3883
3884 // An Event wraps a win32 "CreateEvent" kernel handle.
3885 //
3886 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3887 //
3888 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3889 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3890 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3891 // In addition, an unpark() operation might fetch the handle field, but the
3892 // event could recycle between the fetch and the SetEvent() operation.
3893 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3894 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3895 // on an stale but recycled handle would be harmless, but in practice this might
3896 // confuse other non-Sun code, so it's not a viable approach.
3897 //
3898 // 2: Once a win32 event handle is associated with an Event, it remains associated
3899 // with the Event. The event handle is never closed. This could be construed
3900 // as handle leakage, but only up to the maximum # of threads that have been extant
3901 // at any one time. This shouldn't be an issue, as windows platforms typically
3902 // permit a process to have hundreds of thousands of open handles.
3903 //
3904 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3905 // and release unused handles.
3906 //
3907 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3908 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3909 //
3910 // 5. Use an RCU-like mechanism (Read-Copy Update).
3911 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3912 //
3913 // We use (2).
3914 //
3915 // TODO-FIXME:
3916 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3917 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3918 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3919 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3920 // into a single win32 CreateEvent() handle.
3921 //
3922 // _Event transitions in park()
3923 // -1 => -1 : illegal
3924 // 1 => 0 : pass - return immediately
3925 // 0 => -1 : block
3926 //
3927 // _Event serves as a restricted-range semaphore :
3928 // -1 : thread is blocked
3929 // 0 : neutral - thread is running or ready
3930 // 1 : signaled - thread is running or ready
3931 //
3932 // Another possible encoding of _Event would be
3933 // with explicit "PARKED" and "SIGNALED" bits.
3934
3935 int os::PlatformEvent::park (jlong Millis) {
3936 guarantee (_ParkHandle != NULL , "Invariant") ;
3937 guarantee (Millis > 0 , "Invariant") ;
3938 int v ;
3939
3940 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3941 // the initial park() operation.
3942
3943 for (;;) {
3944 v = _Event ;
3945 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3946 }
3947 guarantee ((v == 0) || (v == 1), "invariant") ;
3948 if (v != 0) return OS_OK ;
3949
3950 // Do this the hard way by blocking ...
3951 // TODO: consider a brief spin here, gated on the success of recent
3952 // spin attempts by this thread.
3953 //
3954 // We decompose long timeouts into series of shorter timed waits.
3955 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3956 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3957 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3958 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3959 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3960 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3961 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3962 // for the already waited time. This policy does not admit any new outcomes.
3963 // In the future, however, we might want to track the accumulated wait time and
3964 // adjust Millis accordingly if we encounter a spurious wakeup.
3965
3966 const int MAXTIMEOUT = 0x10000000 ;
3967 DWORD rv = WAIT_TIMEOUT ;
3968 while (_Event < 0 && Millis > 0) {
3969 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3970 if (Millis > MAXTIMEOUT) {
3971 prd = MAXTIMEOUT ;
3972 }
3973 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3974 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3975 if (rv == WAIT_TIMEOUT) {
3976 Millis -= prd ;
3977 }
3978 }
3979 v = _Event ;
3980 _Event = 0 ;
3981 OrderAccess::fence() ;
3982 // If we encounter a nearly simultanous timeout expiry and unpark()
3983 // we return OS_OK indicating we awoke via unpark().
3984 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3985 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3986 }
3987
3988 void os::PlatformEvent::park () {
3989 guarantee (_ParkHandle != NULL, "Invariant") ;
3990 // Invariant: Only the thread associated with the Event/PlatformEvent
3991 // may call park().
3992 int v ;
3993 for (;;) {
3994 v = _Event ;
3995 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3996 }
3997 guarantee ((v == 0) || (v == 1), "invariant") ;
3998 if (v != 0) return ;
3999
4000 // Do this the hard way by blocking ...
4001 // TODO: consider a brief spin here, gated on the success of recent
4002 // spin attempts by this thread.
4003 while (_Event < 0) {
4004 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4005 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4006 }
4007
4008 // Usually we'll find _Event == 0 at this point, but as
4009 // an optional optimization we clear it, just in case can
4010 // multiple unpark() operations drove _Event up to 1.
4011 _Event = 0 ;
4012 OrderAccess::fence() ;
4013 guarantee (_Event >= 0, "invariant") ;
4014 }
4015
4016 void os::PlatformEvent::unpark() {
4017 guarantee (_ParkHandle != NULL, "Invariant") ;
4018 int v ;
4019 for (;;) {
4020 v = _Event ; // Increment _Event if it's < 1.
4021 if (v > 0) {
4022 // If it's already signaled just return.
4023 // The LD of _Event could have reordered or be satisfied
4024 // by a read-aside from this processor's write buffer.
4025 // To avoid problems execute a barrier and then
4026 // ratify the value. A degenerate CAS() would also work.
4027 // Viz., CAS (v+0, &_Event, v) == v).
4028 OrderAccess::fence() ;
4029 if (_Event == v) return ;
4030 continue ;
4031 }
4032 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4033 }
4034 if (v < 0) {
4035 ::SetEvent (_ParkHandle) ;
4036 }
4037 }
4038
4039
4040 // JSR166
4041 // -------------------------------------------------------
4042
4043 /*
4044 * The Windows implementation of Park is very straightforward: Basic
4045 * operations on Win32 Events turn out to have the right semantics to
4046 * use them directly. We opportunistically resuse the event inherited
4047 * from Monitor.
4048 */
4049
4050
4051 void Parker::park(bool isAbsolute, jlong time) {
4052 guarantee (_ParkEvent != NULL, "invariant") ;
4053 // First, demultiplex/decode time arguments
4054 if (time < 0) { // don't wait
4055 return;
4056 }
4057 else if (time == 0 && !isAbsolute) {
4058 time = INFINITE;
4059 }
4060 else if (isAbsolute) {
4061 time -= os::javaTimeMillis(); // convert to relative time
4062 if (time <= 0) // already elapsed
4063 return;
4064 }
4065 else { // relative
4066 time /= 1000000; // Must coarsen from nanos to millis
4067 if (time == 0) // Wait for the minimal time unit if zero
4068 time = 1;
4069 }
4070
4071 JavaThread* thread = (JavaThread*)(Thread::current());
4072 assert(thread->is_Java_thread(), "Must be JavaThread");
4073 JavaThread *jt = (JavaThread *)thread;
4074
4075 // Don't wait if interrupted or already triggered
4076 if (Thread::is_interrupted(thread, false) ||
4077 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4078 ResetEvent(_ParkEvent);
4079 return;
4080 }
4081 else {
4082 ThreadBlockInVM tbivm(jt);
4083 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4084 jt->set_suspend_equivalent();
4085
4086 WaitForSingleObject(_ParkEvent, time);
4087 ResetEvent(_ParkEvent);
4088
4089 // If externally suspended while waiting, re-suspend
4090 if (jt->handle_special_suspend_equivalent_condition()) {
4091 jt->java_suspend_self();
4092 }
4093 }
4094 }
4095
4096 void Parker::unpark() {
4097 guarantee (_ParkEvent != NULL, "invariant") ;
4098 SetEvent(_ParkEvent);
4099 }
4100
4101 // Run the specified command in a separate process. Return its exit value,
4102 // or -1 on failure (e.g. can't create a new process).
4103 int os::fork_and_exec(char* cmd) {
4104 STARTUPINFO si;
4105 PROCESS_INFORMATION pi;
4106
4107 memset(&si, 0, sizeof(si));
4108 si.cb = sizeof(si);
4109 memset(&pi, 0, sizeof(pi));
4110 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4111 cmd, // command line
4112 NULL, // process security attribute
4113 NULL, // thread security attribute
4114 TRUE, // inherits system handles
4115 0, // no creation flags
4116 NULL, // use parent's environment block
4117 NULL, // use parent's starting directory
4118 &si, // (in) startup information
4119 &pi); // (out) process information
4120
4121 if (rslt) {
4122 // Wait until child process exits.
4123 WaitForSingleObject(pi.hProcess, INFINITE);
4124
4125 DWORD exit_code;
4126 GetExitCodeProcess(pi.hProcess, &exit_code);
4127
4128 // Close process and thread handles.
4129 CloseHandle(pi.hProcess);
4130 CloseHandle(pi.hThread);
4131
4132 return (int)exit_code;
4133 } else {
4134 return -1;
4135 }
4136 }
4137
4138 //--------------------------------------------------------------------------------------------------
4139 // Non-product code
4140
4141 static int mallocDebugIntervalCounter = 0;
4142 static int mallocDebugCounter = 0;
4143 bool os::check_heap(bool force) {
4144 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4145 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4146 // Note: HeapValidate executes two hardware breakpoints when it finds something
4147 // wrong; at these points, eax contains the address of the offending block (I think).
4148 // To get to the exlicit error message(s) below, just continue twice.
4149 HANDLE heap = GetProcessHeap();
4150 { HeapLock(heap);
4151 PROCESS_HEAP_ENTRY phe;
4152 phe.lpData = NULL;
4153 while (HeapWalk(heap, &phe) != 0) {
4154 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4155 !HeapValidate(heap, 0, phe.lpData)) {
4156 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4157 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4158 fatal("corrupted C heap");
4159 }
4160 }
4161 int err = GetLastError();
4162 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4163 fatal(err_msg("heap walk aborted with error %d", err));
4164 }
4165 HeapUnlock(heap);
4166 }
4167 mallocDebugIntervalCounter = 0;
4168 }
4169 return true;
4170 }
4171
4172
4173 bool os::find(address addr, outputStream* st) {
4174 // Nothing yet
4175 return false;
4176 }
4177
4178 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4179 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4180
4181 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4182 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4183 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4184 address addr = (address) exceptionRecord->ExceptionInformation[1];
4185
4186 if (os::is_memory_serialize_page(thread, addr))
4187 return EXCEPTION_CONTINUE_EXECUTION;
4188 }
4189
4190 return EXCEPTION_CONTINUE_SEARCH;
4191 }
4192
4193 static int getLastErrorString(char *buf, size_t len)
4194 {
4195 long errval;
4196
4197 if ((errval = GetLastError()) != 0)
4198 {
4199 /* DOS error */
4200 size_t n = (size_t)FormatMessage(
4201 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4202 NULL,
4203 errval,
4204 0,
4205 buf,
4206 (DWORD)len,
4207 NULL);
4208 if (n > 3) {
4209 /* Drop final '.', CR, LF */
4210 if (buf[n - 1] == '\n') n--;
4211 if (buf[n - 1] == '\r') n--;
4212 if (buf[n - 1] == '.') n--;
4213 buf[n] = '\0';
4214 }
4215 return (int)n;
4216 }
4217
4218 if (errno != 0)
4219 {
4220 /* C runtime error that has no corresponding DOS error code */
4221 const char *s = strerror(errno);
4222 size_t n = strlen(s);
4223 if (n >= len) n = len - 1;
4224 strncpy(buf, s, n);
4225 buf[n] = '\0';
4226 return (int)n;
4227 }
4228 return 0;
4229 }
4230
4231
4232 // We don't build a headless jre for Windows
4233 bool os::is_headless_jre() { return false; }
4234