1 /*
2 * Copyright (c) 1997, 2011, 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/interfaceSupport.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/javaCalls.hpp"
53 #include "runtime/mutexLocker.hpp"
54 #include "runtime/objectMonitor.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/runtimeService.hpp"
64 #include "thread_windows.inline.hpp"
65 #include "utilities/decoder.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
919 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
920 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
921
922 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
923 HINSTANCE dbghelp;
924 EXCEPTION_POINTERS ep;
925 MINIDUMP_EXCEPTION_INFORMATION mei;
926 HANDLE hProcess = GetCurrentProcess();
927 DWORD processId = GetCurrentProcessId();
928 HANDLE dumpFile;
929 MINIDUMP_TYPE dumpType;
930 static const char* cwd;
931
932 // If running on a client version of Windows and user has not explicitly enabled dumping
933 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
934 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
935 return;
936 // If running on a server version of Windows and user has explictly disabled dumping
937 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
938 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
939 return;
940 }
941
942 dbghelp = LoadLibrary("DBGHELP.DLL");
943
944 if (dbghelp == NULL) {
945 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
946 return;
947 }
948
949 _MiniDumpWriteDump = CAST_TO_FN_PTR(
950 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
951 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
952 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
953
954 if (_MiniDumpWriteDump == NULL) {
955 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
956 return;
957 }
958
959 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
960
961 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
962 // API_VERSION_NUMBER 11 or higher contains the ones we want though
963 #if API_VERSION_NUMBER >= 11
964 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
965 MiniDumpWithUnloadedModules);
966 #endif
967
968 cwd = get_current_directory(NULL, 0);
969 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
970 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
971
972 if (dumpFile == INVALID_HANDLE_VALUE) {
973 VMError::report_coredump_status("Failed to create file for dumping", false);
974 return;
975 }
976
977 ep.ContextRecord = (PCONTEXT) contextRecord;
978 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
979
980 mei.ThreadId = GetCurrentThreadId();
981 mei.ExceptionPointers = &ep;
982
983 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
984 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
985 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, &mei, NULL, NULL) == false &&
986 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, &mei, NULL, NULL) == false) {
987 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
988 } else {
989 VMError::report_coredump_status(buffer, true);
990 }
991
992 CloseHandle(dumpFile);
993 }
994
995
996
997 void os::abort(bool dump_core)
998 {
999 os::shutdown();
1000 // no core dump on Windows
1001 ::exit(1);
1002 }
1003
1004 // Die immediately, no exit hook, no abort hook, no cleanup.
1005 void os::die() {
1006 _exit(-1);
1007 }
1008
1009 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1010 // * dirent_md.c 1.15 00/02/02
1011 //
1012 // The declarations for DIR and struct dirent are in jvm_win32.h.
1013
1014 /* Caller must have already run dirname through JVM_NativePath, which removes
1015 duplicate slashes and converts all instances of '/' into '\\'. */
1016
1017 DIR *
1018 os::opendir(const char *dirname)
1019 {
1020 assert(dirname != NULL, "just checking"); // hotspot change
1021 DIR *dirp = (DIR *)malloc(sizeof(DIR));
1022 DWORD fattr; // hotspot change
1023 char alt_dirname[4] = { 0, 0, 0, 0 };
1024
1025 if (dirp == 0) {
1026 errno = ENOMEM;
1027 return 0;
1028 }
1029
1030 /*
1031 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1032 * as a directory in FindFirstFile(). We detect this case here and
1033 * prepend the current drive name.
1034 */
1035 if (dirname[1] == '\0' && dirname[0] == '\\') {
1036 alt_dirname[0] = _getdrive() + 'A' - 1;
1037 alt_dirname[1] = ':';
1038 alt_dirname[2] = '\\';
1039 alt_dirname[3] = '\0';
1040 dirname = alt_dirname;
1041 }
1042
1043 dirp->path = (char *)malloc(strlen(dirname) + 5);
1044 if (dirp->path == 0) {
1045 free(dirp);
1046 errno = ENOMEM;
1047 return 0;
1048 }
1049 strcpy(dirp->path, dirname);
1050
1051 fattr = GetFileAttributes(dirp->path);
1052 if (fattr == 0xffffffff) {
1053 free(dirp->path);
1054 free(dirp);
1055 errno = ENOENT;
1056 return 0;
1057 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1058 free(dirp->path);
1059 free(dirp);
1060 errno = ENOTDIR;
1061 return 0;
1062 }
1063
1064 /* Append "*.*", or possibly "\\*.*", to path */
1065 if (dirp->path[1] == ':'
1066 && (dirp->path[2] == '\0'
1067 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1068 /* No '\\' needed for cases like "Z:" or "Z:\" */
1069 strcat(dirp->path, "*.*");
1070 } else {
1071 strcat(dirp->path, "\\*.*");
1072 }
1073
1074 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1075 if (dirp->handle == INVALID_HANDLE_VALUE) {
1076 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1077 free(dirp->path);
1078 free(dirp);
1079 errno = EACCES;
1080 return 0;
1081 }
1082 }
1083 return dirp;
1084 }
1085
1086 /* parameter dbuf unused on Windows */
1087
1088 struct dirent *
1089 os::readdir(DIR *dirp, dirent *dbuf)
1090 {
1091 assert(dirp != NULL, "just checking"); // hotspot change
1092 if (dirp->handle == INVALID_HANDLE_VALUE) {
1093 return 0;
1094 }
1095
1096 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1097
1098 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1099 if (GetLastError() == ERROR_INVALID_HANDLE) {
1100 errno = EBADF;
1101 return 0;
1102 }
1103 FindClose(dirp->handle);
1104 dirp->handle = INVALID_HANDLE_VALUE;
1105 }
1106
1107 return &dirp->dirent;
1108 }
1109
1110 int
1111 os::closedir(DIR *dirp)
1112 {
1113 assert(dirp != NULL, "just checking"); // hotspot change
1114 if (dirp->handle != INVALID_HANDLE_VALUE) {
1115 if (!FindClose(dirp->handle)) {
1116 errno = EBADF;
1117 return -1;
1118 }
1119 dirp->handle = INVALID_HANDLE_VALUE;
1120 }
1121 free(dirp->path);
1122 free(dirp);
1123 return 0;
1124 }
1125
1126 // This must be hard coded because it's the system's temporary
1127 // directory not the java application's temp directory, ala java.io.tmpdir.
1128 const char* os::get_temp_directory() {
1129 static char path_buf[MAX_PATH];
1130 if (GetTempPath(MAX_PATH, path_buf)>0)
1131 return path_buf;
1132 else{
1133 path_buf[0]='\0';
1134 return path_buf;
1135 }
1136 }
1137
1138 static bool file_exists(const char* filename) {
1139 if (filename == NULL || strlen(filename) == 0) {
1140 return false;
1141 }
1142 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1143 }
1144
1145 void os::dll_build_name(char *buffer, size_t buflen,
1146 const char* pname, const char* fname) {
1147 const size_t pnamelen = pname ? strlen(pname) : 0;
1148 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1149
1150 // Quietly truncates on buffer overflow. Should be an error.
1151 if (pnamelen + strlen(fname) + 10 > buflen) {
1152 *buffer = '\0';
1153 return;
1154 }
1155
1156 if (pnamelen == 0) {
1157 jio_snprintf(buffer, buflen, "%s.dll", fname);
1158 } else if (c == ':' || c == '\\') {
1159 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1160 } else if (strchr(pname, *os::path_separator()) != NULL) {
1161 int n;
1162 char** pelements = split_path(pname, &n);
1163 for (int i = 0 ; i < n ; i++) {
1164 char* path = pelements[i];
1165 // Really shouldn't be NULL, but check can't hurt
1166 size_t plen = (path == NULL) ? 0 : strlen(path);
1167 if (plen == 0) {
1168 continue; // skip the empty path values
1169 }
1170 const char lastchar = path[plen - 1];
1171 if (lastchar == ':' || lastchar == '\\') {
1172 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1173 } else {
1174 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1175 }
1176 if (file_exists(buffer)) {
1177 break;
1178 }
1179 }
1180 // release the storage
1181 for (int i = 0 ; i < n ; i++) {
1182 if (pelements[i] != NULL) {
1183 FREE_C_HEAP_ARRAY(char, pelements[i]);
1184 }
1185 }
1186 if (pelements != NULL) {
1187 FREE_C_HEAP_ARRAY(char*, pelements);
1188 }
1189 } else {
1190 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1191 }
1192 }
1193
1194 // Needs to be in os specific directory because windows requires another
1195 // header file <direct.h>
1196 const char* os::get_current_directory(char *buf, int buflen) {
1197 return _getcwd(buf, buflen);
1198 }
1199
1200 //-----------------------------------------------------------
1201 // Helper functions for fatal error handler
1202
1203 // The following library functions are resolved dynamically at runtime:
1204
1205 // PSAPI functions, for Windows NT, 2000, XP
1206
1207 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1208 // SDK from Microsoft. Here are the definitions copied from psapi.h
1209 typedef struct _MODULEINFO {
1210 LPVOID lpBaseOfDll;
1211 DWORD SizeOfImage;
1212 LPVOID EntryPoint;
1213 } MODULEINFO, *LPMODULEINFO;
1214
1215 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1216 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1217 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1218
1219 // ToolHelp Functions, for Windows 95, 98 and ME
1220
1221 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1222 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1223 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1224
1225 bool _has_psapi;
1226 bool _psapi_init = false;
1227 bool _has_toolhelp;
1228
1229 static bool _init_psapi() {
1230 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1231 if( psapi == NULL ) return false ;
1232
1233 _EnumProcessModules = CAST_TO_FN_PTR(
1234 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1235 GetProcAddress(psapi, "EnumProcessModules")) ;
1236 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1237 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1238 GetProcAddress(psapi, "GetModuleFileNameExA"));
1239 _GetModuleInformation = CAST_TO_FN_PTR(
1240 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1241 GetProcAddress(psapi, "GetModuleInformation"));
1242
1243 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1244 _psapi_init = true;
1245 return _has_psapi;
1246 }
1247
1248 static bool _init_toolhelp() {
1249 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1250 if (kernel32 == NULL) return false ;
1251
1252 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1253 HANDLE(WINAPI *)(DWORD,DWORD),
1254 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1255 _Module32First = CAST_TO_FN_PTR(
1256 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1257 GetProcAddress(kernel32, "Module32First" ));
1258 _Module32Next = CAST_TO_FN_PTR(
1259 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1260 GetProcAddress(kernel32, "Module32Next" ));
1261
1262 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1263 return _has_toolhelp;
1264 }
1265
1266 #ifdef _WIN64
1267 // Helper routine which returns true if address in
1268 // within the NTDLL address space.
1269 //
1270 static bool _addr_in_ntdll( address addr )
1271 {
1272 HMODULE hmod;
1273 MODULEINFO minfo;
1274
1275 hmod = GetModuleHandle("NTDLL.DLL");
1276 if ( hmod == NULL ) return false;
1277 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1278 &minfo, sizeof(MODULEINFO)) )
1279 return false;
1280
1281 if ( (addr >= minfo.lpBaseOfDll) &&
1282 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1283 return true;
1284 else
1285 return false;
1286 }
1287 #endif
1288
1289
1290 // Enumerate all modules for a given process ID
1291 //
1292 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1293 // different API for doing this. We use PSAPI.DLL on NT based
1294 // Windows and ToolHelp on 95/98/Me.
1295
1296 // Callback function that is called by enumerate_modules() on
1297 // every DLL module.
1298 // Input parameters:
1299 // int pid,
1300 // char* module_file_name,
1301 // address module_base_addr,
1302 // unsigned module_size,
1303 // void* param
1304 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1305
1306 // enumerate_modules for Windows NT, using PSAPI
1307 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1308 {
1309 HANDLE hProcess ;
1310
1311 # define MAX_NUM_MODULES 128
1312 HMODULE modules[MAX_NUM_MODULES];
1313 static char filename[ MAX_PATH ];
1314 int result = 0;
1315
1316 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1317
1318 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1319 FALSE, pid ) ;
1320 if (hProcess == NULL) return 0;
1321
1322 DWORD size_needed;
1323 if (!_EnumProcessModules(hProcess, modules,
1324 sizeof(modules), &size_needed)) {
1325 CloseHandle( hProcess );
1326 return 0;
1327 }
1328
1329 // number of modules that are currently loaded
1330 int num_modules = size_needed / sizeof(HMODULE);
1331
1332 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1333 // Get Full pathname:
1334 if(!_GetModuleFileNameEx(hProcess, modules[i],
1335 filename, sizeof(filename))) {
1336 filename[0] = '\0';
1337 }
1338
1339 MODULEINFO modinfo;
1340 if (!_GetModuleInformation(hProcess, modules[i],
1341 &modinfo, sizeof(modinfo))) {
1342 modinfo.lpBaseOfDll = NULL;
1343 modinfo.SizeOfImage = 0;
1344 }
1345
1346 // Invoke callback function
1347 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1348 modinfo.SizeOfImage, param);
1349 if (result) break;
1350 }
1351
1352 CloseHandle( hProcess ) ;
1353 return result;
1354 }
1355
1356
1357 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1358 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1359 {
1360 HANDLE hSnapShot ;
1361 static MODULEENTRY32 modentry ;
1362 int result = 0;
1363
1364 if (!_has_toolhelp) return 0;
1365
1366 // Get a handle to a Toolhelp snapshot of the system
1367 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1368 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1369 return FALSE ;
1370 }
1371
1372 // iterate through all modules
1373 modentry.dwSize = sizeof(MODULEENTRY32) ;
1374 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1375
1376 while( not_done ) {
1377 // invoke the callback
1378 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1379 modentry.modBaseSize, param);
1380 if (result) break;
1381
1382 modentry.dwSize = sizeof(MODULEENTRY32) ;
1383 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1384 }
1385
1386 CloseHandle(hSnapShot);
1387 return result;
1388 }
1389
1390 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1391 {
1392 // Get current process ID if caller doesn't provide it.
1393 if (!pid) pid = os::current_process_id();
1394
1395 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1396 else return _enumerate_modules_windows(pid, func, param);
1397 }
1398
1399 struct _modinfo {
1400 address addr;
1401 char* full_path; // point to a char buffer
1402 int buflen; // size of the buffer
1403 address base_addr;
1404 };
1405
1406 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1407 unsigned size, void * param) {
1408 struct _modinfo *pmod = (struct _modinfo *)param;
1409 if (!pmod) return -1;
1410
1411 if (base_addr <= pmod->addr &&
1412 base_addr+size > pmod->addr) {
1413 // if a buffer is provided, copy path name to the buffer
1414 if (pmod->full_path) {
1415 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1416 }
1417 pmod->base_addr = base_addr;
1418 return 1;
1419 }
1420 return 0;
1421 }
1422
1423 bool os::dll_address_to_library_name(address addr, char* buf,
1424 int buflen, int* offset) {
1425 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1426 // return the full path to the DLL file, sometimes it returns path
1427 // to the corresponding PDB file (debug info); sometimes it only
1428 // returns partial path, which makes life painful.
1429
1430 struct _modinfo mi;
1431 mi.addr = addr;
1432 mi.full_path = buf;
1433 mi.buflen = buflen;
1434 int pid = os::current_process_id();
1435 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1436 // buf already contains path name
1437 if (offset) *offset = addr - mi.base_addr;
1438 return true;
1439 } else {
1440 if (buf) buf[0] = '\0';
1441 if (offset) *offset = -1;
1442 return false;
1443 }
1444 }
1445
1446 bool os::dll_address_to_function_name(address addr, char *buf,
1447 int buflen, int *offset) {
1448 if (Decoder::decode(addr, buf, buflen, offset) == Decoder::no_error) {
1449 return true;
1450 }
1451 if (offset != NULL) *offset = -1;
1452 if (buf != NULL) buf[0] = '\0';
1453 return false;
1454 }
1455
1456 // save the start and end address of jvm.dll into param[0] and param[1]
1457 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1458 unsigned size, void * param) {
1459 if (!param) return -1;
1460
1461 if (base_addr <= (address)_locate_jvm_dll &&
1462 base_addr+size > (address)_locate_jvm_dll) {
1463 ((address*)param)[0] = base_addr;
1464 ((address*)param)[1] = base_addr + size;
1465 return 1;
1466 }
1467 return 0;
1468 }
1469
1470 address vm_lib_location[2]; // start and end address of jvm.dll
1471
1472 // check if addr is inside jvm.dll
1473 bool os::address_is_in_vm(address addr) {
1474 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1475 int pid = os::current_process_id();
1476 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1477 assert(false, "Can't find jvm module.");
1478 return false;
1479 }
1480 }
1481
1482 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1483 }
1484
1485 // print module info; param is outputStream*
1486 static int _print_module(int pid, char* fname, address base,
1487 unsigned size, void* param) {
1488 if (!param) return -1;
1489
1490 outputStream* st = (outputStream*)param;
1491
1492 address end_addr = base + size;
1493 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1494 return 0;
1495 }
1496
1497 // Loads .dll/.so and
1498 // in case of error it checks if .dll/.so was built for the
1499 // same architecture as Hotspot is running on
1500 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1501 {
1502 void * result = LoadLibrary(name);
1503 if (result != NULL)
1504 {
1505 return result;
1506 }
1507
1508 long errcode = GetLastError();
1509 if (errcode == ERROR_MOD_NOT_FOUND) {
1510 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1511 ebuf[ebuflen-1]='\0';
1512 return NULL;
1513 }
1514
1515 // Parsing dll below
1516 // If we can read dll-info and find that dll was built
1517 // for an architecture other than Hotspot is running in
1518 // - then print to buffer "DLL was built for a different architecture"
1519 // else call getLastErrorString to obtain system error message
1520
1521 // Read system error message into ebuf
1522 // It may or may not be overwritten below (in the for loop and just above)
1523 getLastErrorString(ebuf, (size_t) ebuflen);
1524 ebuf[ebuflen-1]='\0';
1525 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1526 if (file_descriptor<0)
1527 {
1528 return NULL;
1529 }
1530
1531 uint32_t signature_offset;
1532 uint16_t lib_arch=0;
1533 bool failed_to_get_lib_arch=
1534 (
1535 //Go to position 3c in the dll
1536 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1537 ||
1538 // Read loacation of signature
1539 (sizeof(signature_offset)!=
1540 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1541 ||
1542 //Go to COFF File Header in dll
1543 //that is located after"signature" (4 bytes long)
1544 (os::seek_to_file_offset(file_descriptor,
1545 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1546 ||
1547 //Read field that contains code of architecture
1548 // that dll was build for
1549 (sizeof(lib_arch)!=
1550 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1551 );
1552
1553 ::close(file_descriptor);
1554 if (failed_to_get_lib_arch)
1555 {
1556 // file i/o error - report getLastErrorString(...) msg
1557 return NULL;
1558 }
1559
1560 typedef struct
1561 {
1562 uint16_t arch_code;
1563 char* arch_name;
1564 } arch_t;
1565
1566 static const arch_t arch_array[]={
1567 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1568 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1569 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1570 };
1571 #if (defined _M_IA64)
1572 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1573 #elif (defined _M_AMD64)
1574 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1575 #elif (defined _M_IX86)
1576 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1577 #else
1578 #error Method os::dll_load requires that one of following \
1579 is defined :_M_IA64,_M_AMD64 or _M_IX86
1580 #endif
1581
1582
1583 // Obtain a string for printf operation
1584 // lib_arch_str shall contain string what platform this .dll was built for
1585 // running_arch_str shall string contain what platform Hotspot was built for
1586 char *running_arch_str=NULL,*lib_arch_str=NULL;
1587 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1588 {
1589 if (lib_arch==arch_array[i].arch_code)
1590 lib_arch_str=arch_array[i].arch_name;
1591 if (running_arch==arch_array[i].arch_code)
1592 running_arch_str=arch_array[i].arch_name;
1593 }
1594
1595 assert(running_arch_str,
1596 "Didn't find runing architecture code in arch_array");
1597
1598 // If the architure is right
1599 // but some other error took place - report getLastErrorString(...) msg
1600 if (lib_arch == running_arch)
1601 {
1602 return NULL;
1603 }
1604
1605 if (lib_arch_str!=NULL)
1606 {
1607 ::_snprintf(ebuf, ebuflen-1,
1608 "Can't load %s-bit .dll on a %s-bit platform",
1609 lib_arch_str,running_arch_str);
1610 }
1611 else
1612 {
1613 // don't know what architecture this dll was build for
1614 ::_snprintf(ebuf, ebuflen-1,
1615 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1616 lib_arch,running_arch_str);
1617 }
1618
1619 return NULL;
1620 }
1621
1622
1623 void os::print_dll_info(outputStream *st) {
1624 int pid = os::current_process_id();
1625 st->print_cr("Dynamic libraries:");
1626 enumerate_modules(pid, _print_module, (void *)st);
1627 }
1628
1629 // function pointer to Windows API "GetNativeSystemInfo".
1630 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1631 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1632
1633 void os::print_os_info(outputStream* st) {
1634 st->print("OS:");
1635
1636 OSVERSIONINFOEX osvi;
1637 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1638 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1639
1640 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1641 st->print_cr("N/A");
1642 return;
1643 }
1644
1645 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1646 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1647 switch (os_vers) {
1648 case 3051: st->print(" Windows NT 3.51"); break;
1649 case 4000: st->print(" Windows NT 4.0"); break;
1650 case 5000: st->print(" Windows 2000"); break;
1651 case 5001: st->print(" Windows XP"); break;
1652 case 5002:
1653 case 6000:
1654 case 6001: {
1655 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1656 // find out whether we are running on 64 bit processor or not.
1657 SYSTEM_INFO si;
1658 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1659 // Check to see if _GetNativeSystemInfo has been initialized.
1660 if (_GetNativeSystemInfo == NULL) {
1661 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1662 _GetNativeSystemInfo =
1663 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1664 GetProcAddress(hKernel32,
1665 "GetNativeSystemInfo"));
1666 if (_GetNativeSystemInfo == NULL)
1667 GetSystemInfo(&si);
1668 } else {
1669 _GetNativeSystemInfo(&si);
1670 }
1671 if (os_vers == 5002) {
1672 if (osvi.wProductType == VER_NT_WORKSTATION &&
1673 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1674 st->print(" Windows XP x64 Edition");
1675 else
1676 st->print(" Windows Server 2003 family");
1677 } else if (os_vers == 6000) {
1678 if (osvi.wProductType == VER_NT_WORKSTATION)
1679 st->print(" Windows Vista");
1680 else
1681 st->print(" Windows Server 2008");
1682 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1683 st->print(" , 64 bit");
1684 } else if (os_vers == 6001) {
1685 if (osvi.wProductType == VER_NT_WORKSTATION) {
1686 st->print(" Windows 7");
1687 } else {
1688 // Unrecognized windows, print out its major and minor versions
1689 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1690 }
1691 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1692 st->print(" , 64 bit");
1693 } else { // future os
1694 // Unrecognized windows, print out its major and minor versions
1695 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1696 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1697 st->print(" , 64 bit");
1698 }
1699 break;
1700 }
1701 default: // future windows, print out its major and minor versions
1702 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1703 }
1704 } else {
1705 switch (os_vers) {
1706 case 4000: st->print(" Windows 95"); break;
1707 case 4010: st->print(" Windows 98"); break;
1708 case 4090: st->print(" Windows Me"); break;
1709 default: // future windows, print out its major and minor versions
1710 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1711 }
1712 }
1713 st->print(" Build %d", osvi.dwBuildNumber);
1714 st->print(" %s", osvi.szCSDVersion); // service pack
1715 st->cr();
1716 }
1717
1718 void os::print_memory_info(outputStream* st) {
1719 st->print("Memory:");
1720 st->print(" %dk page", os::vm_page_size()>>10);
1721
1722 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1723 // value if total memory is larger than 4GB
1724 MEMORYSTATUSEX ms;
1725 ms.dwLength = sizeof(ms);
1726 GlobalMemoryStatusEx(&ms);
1727
1728 st->print(", physical %uk", os::physical_memory() >> 10);
1729 st->print("(%uk free)", os::available_memory() >> 10);
1730
1731 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1732 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1733 st->cr();
1734 }
1735
1736 void os::print_siginfo(outputStream *st, void *siginfo) {
1737 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1738 st->print("siginfo:");
1739 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1740
1741 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1742 er->NumberParameters >= 2) {
1743 switch (er->ExceptionInformation[0]) {
1744 case 0: st->print(", reading address"); break;
1745 case 1: st->print(", writing address"); break;
1746 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1747 er->ExceptionInformation[0]);
1748 }
1749 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1750 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1751 er->NumberParameters >= 2 && UseSharedSpaces) {
1752 FileMapInfo* mapinfo = FileMapInfo::current_info();
1753 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1754 st->print("\n\nError accessing class data sharing archive." \
1755 " Mapped file inaccessible during execution, " \
1756 " possible disk/network problem.");
1757 }
1758 } else {
1759 int num = er->NumberParameters;
1760 if (num > 0) {
1761 st->print(", ExceptionInformation=");
1762 for (int i = 0; i < num; i++) {
1763 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1764 }
1765 }
1766 }
1767 st->cr();
1768 }
1769
1770 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1771 // do nothing
1772 }
1773
1774 static char saved_jvm_path[MAX_PATH] = {0};
1775
1776 // Find the full path to the current module, jvm.dll or jvm_g.dll
1777 void os::jvm_path(char *buf, jint buflen) {
1778 // Error checking.
1779 if (buflen < MAX_PATH) {
1780 assert(false, "must use a large-enough buffer");
1781 buf[0] = '\0';
1782 return;
1783 }
1784 // Lazy resolve the path to current module.
1785 if (saved_jvm_path[0] != 0) {
1786 strcpy(buf, saved_jvm_path);
1787 return;
1788 }
1789
1790 buf[0] = '\0';
1791 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) {
1792 // Support for the gamma launcher. Check for an
1793 // JAVA_HOME environment variable
1794 // and fix up the path so it looks like
1795 // libjvm.so is installed there (append a fake suffix
1796 // hotspot/libjvm.so).
1797 char* java_home_var = ::getenv("JAVA_HOME");
1798 if (java_home_var != NULL && java_home_var[0] != 0) {
1799
1800 strncpy(buf, java_home_var, buflen);
1801
1802 // determine if this is a legacy image or modules image
1803 // modules image doesn't have "jre" subdirectory
1804 size_t len = strlen(buf);
1805 char* jrebin_p = buf + len;
1806 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1807 if (0 != _access(buf, 0)) {
1808 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1809 }
1810 len = strlen(buf);
1811 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1812 }
1813 }
1814
1815 if(buf[0] == '\0') {
1816 GetModuleFileName(vm_lib_handle, buf, buflen);
1817 }
1818 strcpy(saved_jvm_path, buf);
1819 }
1820
1821
1822 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1823 #ifndef _WIN64
1824 st->print("_");
1825 #endif
1826 }
1827
1828
1829 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1830 #ifndef _WIN64
1831 st->print("@%d", args_size * sizeof(int));
1832 #endif
1833 }
1834
1835 // This method is a copy of JDK's sysGetLastErrorString
1836 // from src/windows/hpi/src/system_md.c
1837
1838 size_t os::lasterror(char *buf, size_t len) {
1839 long errval;
1840
1841 if ((errval = GetLastError()) != 0) {
1842 /* DOS error */
1843 int n = (int)FormatMessage(
1844 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1845 NULL,
1846 errval,
1847 0,
1848 buf,
1849 (DWORD)len,
1850 NULL);
1851 if (n > 3) {
1852 /* Drop final '.', CR, LF */
1853 if (buf[n - 1] == '\n') n--;
1854 if (buf[n - 1] == '\r') n--;
1855 if (buf[n - 1] == '.') n--;
1856 buf[n] = '\0';
1857 }
1858 return n;
1859 }
1860
1861 if (errno != 0) {
1862 /* C runtime error that has no corresponding DOS error code */
1863 const char *s = strerror(errno);
1864 size_t n = strlen(s);
1865 if (n >= len) n = len - 1;
1866 strncpy(buf, s, n);
1867 buf[n] = '\0';
1868 return n;
1869 }
1870 return 0;
1871 }
1872
1873 // sun.misc.Signal
1874 // NOTE that this is a workaround for an apparent kernel bug where if
1875 // a signal handler for SIGBREAK is installed then that signal handler
1876 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1877 // See bug 4416763.
1878 static void (*sigbreakHandler)(int) = NULL;
1879
1880 static void UserHandler(int sig, void *siginfo, void *context) {
1881 os::signal_notify(sig);
1882 // We need to reinstate the signal handler each time...
1883 os::signal(sig, (void*)UserHandler);
1884 }
1885
1886 void* os::user_handler() {
1887 return (void*) UserHandler;
1888 }
1889
1890 void* os::signal(int signal_number, void* handler) {
1891 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1892 void (*oldHandler)(int) = sigbreakHandler;
1893 sigbreakHandler = (void (*)(int)) handler;
1894 return (void*) oldHandler;
1895 } else {
1896 return (void*)::signal(signal_number, (void (*)(int))handler);
1897 }
1898 }
1899
1900 void os::signal_raise(int signal_number) {
1901 raise(signal_number);
1902 }
1903
1904 // The Win32 C runtime library maps all console control events other than ^C
1905 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1906 // logoff, and shutdown events. We therefore install our own console handler
1907 // that raises SIGTERM for the latter cases.
1908 //
1909 static BOOL WINAPI consoleHandler(DWORD event) {
1910 switch(event) {
1911 case CTRL_C_EVENT:
1912 if (is_error_reported()) {
1913 // Ctrl-C is pressed during error reporting, likely because the error
1914 // handler fails to abort. Let VM die immediately.
1915 os::die();
1916 }
1917
1918 os::signal_raise(SIGINT);
1919 return TRUE;
1920 break;
1921 case CTRL_BREAK_EVENT:
1922 if (sigbreakHandler != NULL) {
1923 (*sigbreakHandler)(SIGBREAK);
1924 }
1925 return TRUE;
1926 break;
1927 case CTRL_CLOSE_EVENT:
1928 case CTRL_LOGOFF_EVENT:
1929 case CTRL_SHUTDOWN_EVENT:
1930 os::signal_raise(SIGTERM);
1931 return TRUE;
1932 break;
1933 default:
1934 break;
1935 }
1936 return FALSE;
1937 }
1938
1939 /*
1940 * The following code is moved from os.cpp for making this
1941 * code platform specific, which it is by its very nature.
1942 */
1943
1944 // Return maximum OS signal used + 1 for internal use only
1945 // Used as exit signal for signal_thread
1946 int os::sigexitnum_pd(){
1947 return NSIG;
1948 }
1949
1950 // a counter for each possible signal value, including signal_thread exit signal
1951 static volatile jint pending_signals[NSIG+1] = { 0 };
1952 static HANDLE sig_sem;
1953
1954 void os::signal_init_pd() {
1955 // Initialize signal structures
1956 memset((void*)pending_signals, 0, sizeof(pending_signals));
1957
1958 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1959
1960 // Programs embedding the VM do not want it to attempt to receive
1961 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1962 // shutdown hooks mechanism introduced in 1.3. For example, when
1963 // the VM is run as part of a Windows NT service (i.e., a servlet
1964 // engine in a web server), the correct behavior is for any console
1965 // control handler to return FALSE, not TRUE, because the OS's
1966 // "final" handler for such events allows the process to continue if
1967 // it is a service (while terminating it if it is not a service).
1968 // To make this behavior uniform and the mechanism simpler, we
1969 // completely disable the VM's usage of these console events if -Xrs
1970 // (=ReduceSignalUsage) is specified. This means, for example, that
1971 // the CTRL-BREAK thread dump mechanism is also disabled in this
1972 // case. See bugs 4323062, 4345157, and related bugs.
1973
1974 if (!ReduceSignalUsage) {
1975 // Add a CTRL-C handler
1976 SetConsoleCtrlHandler(consoleHandler, TRUE);
1977 }
1978 }
1979
1980 void os::signal_notify(int signal_number) {
1981 BOOL ret;
1982
1983 Atomic::inc(&pending_signals[signal_number]);
1984 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1985 assert(ret != 0, "ReleaseSemaphore() failed");
1986 }
1987
1988 static int check_pending_signals(bool wait_for_signal) {
1989 DWORD ret;
1990 while (true) {
1991 for (int i = 0; i < NSIG + 1; i++) {
1992 jint n = pending_signals[i];
1993 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1994 return i;
1995 }
1996 }
1997 if (!wait_for_signal) {
1998 return -1;
1999 }
2000
2001 JavaThread *thread = JavaThread::current();
2002
2003 ThreadBlockInVM tbivm(thread);
2004
2005 bool threadIsSuspended;
2006 do {
2007 thread->set_suspend_equivalent();
2008 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2009 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2010 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2011
2012 // were we externally suspended while we were waiting?
2013 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2014 if (threadIsSuspended) {
2015 //
2016 // The semaphore has been incremented, but while we were waiting
2017 // another thread suspended us. We don't want to continue running
2018 // while suspended because that would surprise the thread that
2019 // suspended us.
2020 //
2021 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2022 assert(ret != 0, "ReleaseSemaphore() failed");
2023
2024 thread->java_suspend_self();
2025 }
2026 } while (threadIsSuspended);
2027 }
2028 }
2029
2030 int os::signal_lookup() {
2031 return check_pending_signals(false);
2032 }
2033
2034 int os::signal_wait() {
2035 return check_pending_signals(true);
2036 }
2037
2038 // Implicit OS exception handling
2039
2040 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2041 JavaThread* thread = JavaThread::current();
2042 // Save pc in thread
2043 #ifdef _M_IA64
2044 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
2045 // Set pc to handler
2046 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2047 #elif _M_AMD64
2048 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
2049 // Set pc to handler
2050 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2051 #else
2052 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
2053 // Set pc to handler
2054 exceptionInfo->ContextRecord->Eip = (LONG)handler;
2055 #endif
2056
2057 // Continue the execution
2058 return EXCEPTION_CONTINUE_EXECUTION;
2059 }
2060
2061
2062 // Used for PostMortemDump
2063 extern "C" void safepoints();
2064 extern "C" void find(int x);
2065 extern "C" void events();
2066
2067 // According to Windows API documentation, an illegal instruction sequence should generate
2068 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2069 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2070 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2071
2072 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2073
2074 // From "Execution Protection in the Windows Operating System" draft 0.35
2075 // Once a system header becomes available, the "real" define should be
2076 // included or copied here.
2077 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2078
2079 #define def_excpt(val) #val, val
2080
2081 struct siglabel {
2082 char *name;
2083 int number;
2084 };
2085
2086 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2087 // C++ compiler contain this error code. Because this is a compiler-generated
2088 // error, the code is not listed in the Win32 API header files.
2089 // The code is actually a cryptic mnemonic device, with the initial "E"
2090 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2091 // ASCII values of "msc".
2092
2093 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2094
2095
2096 struct siglabel exceptlabels[] = {
2097 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2098 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2099 def_excpt(EXCEPTION_BREAKPOINT),
2100 def_excpt(EXCEPTION_SINGLE_STEP),
2101 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2102 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2103 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2104 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2105 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2106 def_excpt(EXCEPTION_FLT_OVERFLOW),
2107 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2108 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2109 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2110 def_excpt(EXCEPTION_INT_OVERFLOW),
2111 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2112 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2113 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2114 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2115 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2116 def_excpt(EXCEPTION_STACK_OVERFLOW),
2117 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2118 def_excpt(EXCEPTION_GUARD_PAGE),
2119 def_excpt(EXCEPTION_INVALID_HANDLE),
2120 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2121 NULL, 0
2122 };
2123
2124 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2125 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2126 if (exceptlabels[i].number == exception_code) {
2127 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2128 return buf;
2129 }
2130 }
2131
2132 return NULL;
2133 }
2134
2135 //-----------------------------------------------------------------------------
2136 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2137 // handle exception caused by idiv; should only happen for -MinInt/-1
2138 // (division by zero is handled explicitly)
2139 #ifdef _M_IA64
2140 assert(0, "Fix Handle_IDiv_Exception");
2141 #elif _M_AMD64
2142 PCONTEXT ctx = exceptionInfo->ContextRecord;
2143 address pc = (address)ctx->Rip;
2144 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
2145 assert(pc[0] == 0xF7, "not an idiv opcode");
2146 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2147 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2148 // set correct result values and continue after idiv instruction
2149 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2150 ctx->Rax = (DWORD)min_jint; // result
2151 ctx->Rdx = (DWORD)0; // remainder
2152 // Continue the execution
2153 #else
2154 PCONTEXT ctx = exceptionInfo->ContextRecord;
2155 address pc = (address)ctx->Eip;
2156 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
2157 assert(pc[0] == 0xF7, "not an idiv opcode");
2158 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2159 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2160 // set correct result values and continue after idiv instruction
2161 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2162 ctx->Eax = (DWORD)min_jint; // result
2163 ctx->Edx = (DWORD)0; // remainder
2164 // Continue the execution
2165 #endif
2166 return EXCEPTION_CONTINUE_EXECUTION;
2167 }
2168
2169 #ifndef _WIN64
2170 //-----------------------------------------------------------------------------
2171 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2172 // handle exception caused by native method modifying control word
2173 PCONTEXT ctx = exceptionInfo->ContextRecord;
2174 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2175
2176 switch (exception_code) {
2177 case EXCEPTION_FLT_DENORMAL_OPERAND:
2178 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2179 case EXCEPTION_FLT_INEXACT_RESULT:
2180 case EXCEPTION_FLT_INVALID_OPERATION:
2181 case EXCEPTION_FLT_OVERFLOW:
2182 case EXCEPTION_FLT_STACK_CHECK:
2183 case EXCEPTION_FLT_UNDERFLOW:
2184 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2185 if (fp_control_word != ctx->FloatSave.ControlWord) {
2186 // Restore FPCW and mask out FLT exceptions
2187 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2188 // Mask out pending FLT exceptions
2189 ctx->FloatSave.StatusWord &= 0xffffff00;
2190 return EXCEPTION_CONTINUE_EXECUTION;
2191 }
2192 }
2193
2194 if (prev_uef_handler != NULL) {
2195 // We didn't handle this exception so pass it to the previous
2196 // UnhandledExceptionFilter.
2197 return (prev_uef_handler)(exceptionInfo);
2198 }
2199
2200 return EXCEPTION_CONTINUE_SEARCH;
2201 }
2202 #else //_WIN64
2203 /*
2204 On Windows, the mxcsr control bits are non-volatile across calls
2205 See also CR 6192333
2206 If EXCEPTION_FLT_* happened after some native method modified
2207 mxcsr - it is not a jvm fault.
2208 However should we decide to restore of mxcsr after a faulty
2209 native method we can uncomment following code
2210 jint MxCsr = INITIAL_MXCSR;
2211 // we can't use StubRoutines::addr_mxcsr_std()
2212 // because in Win64 mxcsr is not saved there
2213 if (MxCsr != ctx->MxCsr) {
2214 ctx->MxCsr = MxCsr;
2215 return EXCEPTION_CONTINUE_EXECUTION;
2216 }
2217
2218 */
2219 #endif //_WIN64
2220
2221
2222 // Fatal error reporting is single threaded so we can make this a
2223 // static and preallocated. If it's more than MAX_PATH silently ignore
2224 // it.
2225 static char saved_error_file[MAX_PATH] = {0};
2226
2227 void os::set_error_file(const char *logfile) {
2228 if (strlen(logfile) <= MAX_PATH) {
2229 strncpy(saved_error_file, logfile, MAX_PATH);
2230 }
2231 }
2232
2233 static inline void report_error(Thread* t, DWORD exception_code,
2234 address addr, void* siginfo, void* context) {
2235 VMError err(t, exception_code, addr, siginfo, context);
2236 err.report_and_die();
2237
2238 // If UseOsErrorReporting, this will return here and save the error file
2239 // somewhere where we can find it in the minidump.
2240 }
2241
2242 //-----------------------------------------------------------------------------
2243 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2244 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2245 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2246 #ifdef _M_IA64
2247 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2248 #elif _M_AMD64
2249 address pc = (address) exceptionInfo->ContextRecord->Rip;
2250 #else
2251 address pc = (address) exceptionInfo->ContextRecord->Eip;
2252 #endif
2253 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2254
2255 #ifndef _WIN64
2256 // Execution protection violation - win32 running on AMD64 only
2257 // Handled first to avoid misdiagnosis as a "normal" access violation;
2258 // This is safe to do because we have a new/unique ExceptionInformation
2259 // code for this condition.
2260 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2261 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2262 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2263 address addr = (address) exceptionRecord->ExceptionInformation[1];
2264
2265 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2266 int page_size = os::vm_page_size();
2267
2268 // Make sure the pc and the faulting address are sane.
2269 //
2270 // If an instruction spans a page boundary, and the page containing
2271 // the beginning of the instruction is executable but the following
2272 // page is not, the pc and the faulting address might be slightly
2273 // different - we still want to unguard the 2nd page in this case.
2274 //
2275 // 15 bytes seems to be a (very) safe value for max instruction size.
2276 bool pc_is_near_addr =
2277 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2278 bool instr_spans_page_boundary =
2279 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2280 (intptr_t) page_size) > 0);
2281
2282 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2283 static volatile address last_addr =
2284 (address) os::non_memory_address_word();
2285
2286 // In conservative mode, don't unguard unless the address is in the VM
2287 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2288 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2289
2290 // Set memory to RWX and retry
2291 address page_start =
2292 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2293 bool res = os::protect_memory((char*) page_start, page_size,
2294 os::MEM_PROT_RWX);
2295
2296 if (PrintMiscellaneous && Verbose) {
2297 char buf[256];
2298 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2299 "at " INTPTR_FORMAT
2300 ", unguarding " INTPTR_FORMAT ": %s", addr,
2301 page_start, (res ? "success" : strerror(errno)));
2302 tty->print_raw_cr(buf);
2303 }
2304
2305 // Set last_addr so if we fault again at the same address, we don't
2306 // end up in an endless loop.
2307 //
2308 // There are two potential complications here. Two threads trapping
2309 // at the same address at the same time could cause one of the
2310 // threads to think it already unguarded, and abort the VM. Likely
2311 // very rare.
2312 //
2313 // The other race involves two threads alternately trapping at
2314 // different addresses and failing to unguard the page, resulting in
2315 // an endless loop. This condition is probably even more unlikely
2316 // than the first.
2317 //
2318 // Although both cases could be avoided by using locks or thread
2319 // local last_addr, these solutions are unnecessary complication:
2320 // this handler is a best-effort safety net, not a complete solution.
2321 // It is disabled by default and should only be used as a workaround
2322 // in case we missed any no-execute-unsafe VM code.
2323
2324 last_addr = addr;
2325
2326 return EXCEPTION_CONTINUE_EXECUTION;
2327 }
2328 }
2329
2330 // Last unguard failed or not unguarding
2331 tty->print_raw_cr("Execution protection violation");
2332 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2333 exceptionInfo->ContextRecord);
2334 return EXCEPTION_CONTINUE_SEARCH;
2335 }
2336 }
2337 #endif // _WIN64
2338
2339 // Check to see if we caught the safepoint code in the
2340 // process of write protecting the memory serialization page.
2341 // It write enables the page immediately after protecting it
2342 // so just return.
2343 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2344 JavaThread* thread = (JavaThread*) t;
2345 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2346 address addr = (address) exceptionRecord->ExceptionInformation[1];
2347 if ( os::is_memory_serialize_page(thread, addr) ) {
2348 // Block current thread until the memory serialize page permission restored.
2349 os::block_on_serialize_page_trap();
2350 return EXCEPTION_CONTINUE_EXECUTION;
2351 }
2352 }
2353
2354 if (t != NULL && t->is_Java_thread()) {
2355 JavaThread* thread = (JavaThread*) t;
2356 bool in_java = thread->thread_state() == _thread_in_Java;
2357
2358 // Handle potential stack overflows up front.
2359 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2360 if (os::uses_stack_guard_pages()) {
2361 #ifdef _M_IA64
2362 //
2363 // If it's a legal stack address continue, Windows will map it in.
2364 //
2365 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2366 address addr = (address) exceptionRecord->ExceptionInformation[1];
2367 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2368 return EXCEPTION_CONTINUE_EXECUTION;
2369
2370 // The register save area is the same size as the memory stack
2371 // and starts at the page just above the start of the memory stack.
2372 // If we get a fault in this area, we've run out of register
2373 // stack. If we are in java, try throwing a stack overflow exception.
2374 if (addr > thread->stack_base() &&
2375 addr <= (thread->stack_base()+thread->stack_size()) ) {
2376 char buf[256];
2377 jio_snprintf(buf, sizeof(buf),
2378 "Register stack overflow, addr:%p, stack_base:%p\n",
2379 addr, thread->stack_base() );
2380 tty->print_raw_cr(buf);
2381 // If not in java code, return and hope for the best.
2382 return in_java ? Handle_Exception(exceptionInfo,
2383 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2384 : EXCEPTION_CONTINUE_EXECUTION;
2385 }
2386 #endif
2387 if (thread->stack_yellow_zone_enabled()) {
2388 // Yellow zone violation. The o/s has unprotected the first yellow
2389 // zone page for us. Note: must call disable_stack_yellow_zone to
2390 // update the enabled status, even if the zone contains only one page.
2391 thread->disable_stack_yellow_zone();
2392 // If not in java code, return and hope for the best.
2393 return in_java ? Handle_Exception(exceptionInfo,
2394 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2395 : EXCEPTION_CONTINUE_EXECUTION;
2396 } else {
2397 // Fatal red zone violation.
2398 thread->disable_stack_red_zone();
2399 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2400 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2401 exceptionInfo->ContextRecord);
2402 return EXCEPTION_CONTINUE_SEARCH;
2403 }
2404 } else if (in_java) {
2405 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2406 // a one-time-only guard page, which it has released to us. The next
2407 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2408 return Handle_Exception(exceptionInfo,
2409 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2410 } else {
2411 // Can only return and hope for the best. Further stack growth will
2412 // result in an ACCESS_VIOLATION.
2413 return EXCEPTION_CONTINUE_EXECUTION;
2414 }
2415 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2416 // Either stack overflow or null pointer exception.
2417 if (in_java) {
2418 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2419 address addr = (address) exceptionRecord->ExceptionInformation[1];
2420 address stack_end = thread->stack_base() - thread->stack_size();
2421 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2422 // Stack overflow.
2423 assert(!os::uses_stack_guard_pages(),
2424 "should be caught by red zone code above.");
2425 return Handle_Exception(exceptionInfo,
2426 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2427 }
2428 //
2429 // Check for safepoint polling and implicit null
2430 // We only expect null pointers in the stubs (vtable)
2431 // the rest are checked explicitly now.
2432 //
2433 CodeBlob* cb = CodeCache::find_blob(pc);
2434 if (cb != NULL) {
2435 if (os::is_poll_address(addr)) {
2436 address stub = SharedRuntime::get_poll_stub(pc);
2437 return Handle_Exception(exceptionInfo, stub);
2438 }
2439 }
2440 {
2441 #ifdef _WIN64
2442 //
2443 // If it's a legal stack address map the entire region in
2444 //
2445 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2446 address addr = (address) exceptionRecord->ExceptionInformation[1];
2447 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2448 addr = (address)((uintptr_t)addr &
2449 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2450 os::commit_memory((char *)addr, thread->stack_base() - addr,
2451 false );
2452 return EXCEPTION_CONTINUE_EXECUTION;
2453 }
2454 else
2455 #endif
2456 {
2457 // Null pointer exception.
2458 #ifdef _M_IA64
2459 // We catch register stack overflows in compiled code by doing
2460 // an explicit compare and executing a st8(G0, G0) if the
2461 // BSP enters into our guard area. We test for the overflow
2462 // condition and fall into the normal null pointer exception
2463 // code if BSP hasn't overflowed.
2464 if ( in_java ) {
2465 if(thread->register_stack_overflow()) {
2466 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2467 thread->register_stack_limit(),
2468 "GR7 doesn't contain register_stack_limit");
2469 // Disable the yellow zone which sets the state that
2470 // we've got a stack overflow problem.
2471 if (thread->stack_yellow_zone_enabled()) {
2472 thread->disable_stack_yellow_zone();
2473 }
2474 // Give us some room to process the exception
2475 thread->disable_register_stack_guard();
2476 // Update GR7 with the new limit so we can continue running
2477 // compiled code.
2478 exceptionInfo->ContextRecord->IntS3 =
2479 (ULONGLONG)thread->register_stack_limit();
2480 return Handle_Exception(exceptionInfo,
2481 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2482 } else {
2483 //
2484 // Check for implicit null
2485 // We only expect null pointers in the stubs (vtable)
2486 // the rest are checked explicitly now.
2487 //
2488 if (((uintptr_t)addr) < os::vm_page_size() ) {
2489 // an access to the first page of VM--assume it is a null pointer
2490 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2491 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2492 }
2493 }
2494 } // in_java
2495
2496 // IA64 doesn't use implicit null checking yet. So we shouldn't
2497 // get here.
2498 tty->print_raw_cr("Access violation, possible null pointer exception");
2499 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2500 exceptionInfo->ContextRecord);
2501 return EXCEPTION_CONTINUE_SEARCH;
2502 #else /* !IA64 */
2503
2504 // Windows 98 reports faulting addresses incorrectly
2505 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2506 !os::win32::is_nt()) {
2507 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2508 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2509 }
2510 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2511 exceptionInfo->ContextRecord);
2512 return EXCEPTION_CONTINUE_SEARCH;
2513 #endif
2514 }
2515 }
2516 }
2517
2518 #ifdef _WIN64
2519 // Special care for fast JNI field accessors.
2520 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2521 // in and the heap gets shrunk before the field access.
2522 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2523 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2524 if (addr != (address)-1) {
2525 return Handle_Exception(exceptionInfo, addr);
2526 }
2527 }
2528 #endif
2529
2530 #ifdef _WIN64
2531 // Windows will sometimes generate an access violation
2532 // when we call malloc. Since we use VectoredExceptions
2533 // on 64 bit platforms, we see this exception. We must
2534 // pass this exception on so Windows can recover.
2535 // We check to see if the pc of the fault is in NTDLL.DLL
2536 // if so, we pass control on to Windows for handling.
2537 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2538 #endif
2539
2540 // Stack overflow or null pointer exception in native code.
2541 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2542 exceptionInfo->ContextRecord);
2543 return EXCEPTION_CONTINUE_SEARCH;
2544 }
2545
2546 if (in_java) {
2547 switch (exception_code) {
2548 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2549 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2550
2551 case EXCEPTION_INT_OVERFLOW:
2552 return Handle_IDiv_Exception(exceptionInfo);
2553
2554 } // switch
2555 }
2556 #ifndef _WIN64
2557 if (((thread->thread_state() == _thread_in_Java) ||
2558 (thread->thread_state() == _thread_in_native)) &&
2559 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2560 {
2561 LONG result=Handle_FLT_Exception(exceptionInfo);
2562 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2563 }
2564 #endif //_WIN64
2565 }
2566
2567 if (exception_code != EXCEPTION_BREAKPOINT) {
2568 #ifndef _WIN64
2569 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2570 exceptionInfo->ContextRecord);
2571 #else
2572 // Itanium Windows uses a VectoredExceptionHandler
2573 // Which means that C++ programatic exception handlers (try/except)
2574 // will get here. Continue the search for the right except block if
2575 // the exception code is not a fatal code.
2576 switch ( exception_code ) {
2577 case EXCEPTION_ACCESS_VIOLATION:
2578 case EXCEPTION_STACK_OVERFLOW:
2579 case EXCEPTION_ILLEGAL_INSTRUCTION:
2580 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2581 case EXCEPTION_INT_OVERFLOW:
2582 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2583 case EXCEPTION_UNCAUGHT_CXX_EXCEPTION:
2584 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2585 exceptionInfo->ContextRecord);
2586 }
2587 break;
2588 default:
2589 break;
2590 }
2591 #endif
2592 }
2593 return EXCEPTION_CONTINUE_SEARCH;
2594 }
2595
2596 #ifndef _WIN64
2597 // Special care for fast JNI accessors.
2598 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2599 // the heap gets shrunk before the field access.
2600 // Need to install our own structured exception handler since native code may
2601 // install its own.
2602 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2603 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2604 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2605 address pc = (address) exceptionInfo->ContextRecord->Eip;
2606 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2607 if (addr != (address)-1) {
2608 return Handle_Exception(exceptionInfo, addr);
2609 }
2610 }
2611 return EXCEPTION_CONTINUE_SEARCH;
2612 }
2613
2614 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2615 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2616 __try { \
2617 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2618 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2619 } \
2620 return 0; \
2621 }
2622
2623 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2624 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2625 DEFINE_FAST_GETFIELD(jchar, char, Char)
2626 DEFINE_FAST_GETFIELD(jshort, short, Short)
2627 DEFINE_FAST_GETFIELD(jint, int, Int)
2628 DEFINE_FAST_GETFIELD(jlong, long, Long)
2629 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2630 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2631
2632 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2633 switch (type) {
2634 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2635 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2636 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2637 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2638 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2639 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2640 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2641 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2642 default: ShouldNotReachHere();
2643 }
2644 return (address)-1;
2645 }
2646 #endif
2647
2648 // Virtual Memory
2649
2650 int os::vm_page_size() { return os::win32::vm_page_size(); }
2651 int os::vm_allocation_granularity() {
2652 return os::win32::vm_allocation_granularity();
2653 }
2654
2655 // Windows large page support is available on Windows 2003. In order to use
2656 // large page memory, the administrator must first assign additional privilege
2657 // to the user:
2658 // + select Control Panel -> Administrative Tools -> Local Security Policy
2659 // + select Local Policies -> User Rights Assignment
2660 // + double click "Lock pages in memory", add users and/or groups
2661 // + reboot
2662 // Note the above steps are needed for administrator as well, as administrators
2663 // by default do not have the privilege to lock pages in memory.
2664 //
2665 // Note about Windows 2003: although the API supports committing large page
2666 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2667 // scenario, I found through experiment it only uses large page if the entire
2668 // memory region is reserved and committed in a single VirtualAlloc() call.
2669 // This makes Windows large page support more or less like Solaris ISM, in
2670 // that the entire heap must be committed upfront. This probably will change
2671 // in the future, if so the code below needs to be revisited.
2672
2673 #ifndef MEM_LARGE_PAGES
2674 #define MEM_LARGE_PAGES 0x20000000
2675 #endif
2676
2677 // GetLargePageMinimum is only available on Windows 2003. The other functions
2678 // are available on NT but not on Windows 98/Me. We have to resolve them at
2679 // runtime.
2680 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2681 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2682 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2683 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2684 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2685
2686 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2687 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2688 static OpenProcessToken_func_type _OpenProcessToken;
2689 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2690
2691 static HINSTANCE _kernel32;
2692 static HINSTANCE _advapi32;
2693 static HANDLE _hProcess;
2694 static HANDLE _hToken;
2695
2696 static size_t _large_page_size = 0;
2697
2698 static bool resolve_functions_for_large_page_init() {
2699 _kernel32 = LoadLibrary("kernel32.dll");
2700 if (_kernel32 == NULL) return false;
2701
2702 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2703 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2704 if (_GetLargePageMinimum == NULL) return false;
2705
2706 _advapi32 = LoadLibrary("advapi32.dll");
2707 if (_advapi32 == NULL) return false;
2708
2709 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2710 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2711 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2712 GetProcAddress(_advapi32, "OpenProcessToken"));
2713 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2714 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2715 return _AdjustTokenPrivileges != NULL &&
2716 _OpenProcessToken != NULL &&
2717 _LookupPrivilegeValue != NULL;
2718 }
2719
2720 static bool request_lock_memory_privilege() {
2721 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2722 os::current_process_id());
2723
2724 LUID luid;
2725 if (_hProcess != NULL &&
2726 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2727 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2728
2729 TOKEN_PRIVILEGES tp;
2730 tp.PrivilegeCount = 1;
2731 tp.Privileges[0].Luid = luid;
2732 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2733
2734 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2735 // privilege. Check GetLastError() too. See MSDN document.
2736 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2737 (GetLastError() == ERROR_SUCCESS)) {
2738 return true;
2739 }
2740 }
2741
2742 return false;
2743 }
2744
2745 static void cleanup_after_large_page_init() {
2746 _GetLargePageMinimum = NULL;
2747 _AdjustTokenPrivileges = NULL;
2748 _OpenProcessToken = NULL;
2749 _LookupPrivilegeValue = NULL;
2750 if (_kernel32) FreeLibrary(_kernel32);
2751 _kernel32 = NULL;
2752 if (_advapi32) FreeLibrary(_advapi32);
2753 _advapi32 = NULL;
2754 if (_hProcess) CloseHandle(_hProcess);
2755 _hProcess = NULL;
2756 if (_hToken) CloseHandle(_hToken);
2757 _hToken = NULL;
2758 }
2759
2760 bool os::large_page_init() {
2761 if (!UseLargePages) return false;
2762
2763 // print a warning if any large page related flag is specified on command line
2764 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2765 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2766 bool success = false;
2767
2768 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2769 if (resolve_functions_for_large_page_init()) {
2770 if (request_lock_memory_privilege()) {
2771 size_t s = _GetLargePageMinimum();
2772 if (s) {
2773 #if defined(IA32) || defined(AMD64)
2774 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2775 WARN("JVM cannot use large pages bigger than 4mb.");
2776 } else {
2777 #endif
2778 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2779 _large_page_size = LargePageSizeInBytes;
2780 } else {
2781 _large_page_size = s;
2782 }
2783 success = true;
2784 #if defined(IA32) || defined(AMD64)
2785 }
2786 #endif
2787 } else {
2788 WARN("Large page is not supported by the processor.");
2789 }
2790 } else {
2791 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2792 }
2793 } else {
2794 WARN("Large page is not supported by the operating system.");
2795 }
2796 #undef WARN
2797
2798 const size_t default_page_size = (size_t) vm_page_size();
2799 if (success && _large_page_size > default_page_size) {
2800 _page_sizes[0] = _large_page_size;
2801 _page_sizes[1] = default_page_size;
2802 _page_sizes[2] = 0;
2803 }
2804
2805 cleanup_after_large_page_init();
2806 return success;
2807 }
2808
2809 // On win32, one cannot release just a part of reserved memory, it's an
2810 // all or nothing deal. When we split a reservation, we must break the
2811 // reservation into two reservations.
2812 void os::split_reserved_memory(char *base, size_t size, size_t split,
2813 bool realloc) {
2814 if (size > 0) {
2815 release_memory(base, size);
2816 if (realloc) {
2817 reserve_memory(split, base);
2818 }
2819 if (size != split) {
2820 reserve_memory(size - split, base + split);
2821 }
2822 }
2823 }
2824
2825 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2826 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2827 "reserve alignment");
2828 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2829 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2830 assert(res == NULL || addr == NULL || addr == res,
2831 "Unexpected address from reserve.");
2832 return res;
2833 }
2834
2835 // Reserve memory at an arbitrary address, only if that area is
2836 // available (and not reserved for something else).
2837 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2838 // Windows os::reserve_memory() fails of the requested address range is
2839 // not avilable.
2840 return reserve_memory(bytes, requested_addr);
2841 }
2842
2843 size_t os::large_page_size() {
2844 return _large_page_size;
2845 }
2846
2847 bool os::can_commit_large_page_memory() {
2848 // Windows only uses large page memory when the entire region is reserved
2849 // and committed in a single VirtualAlloc() call. This may change in the
2850 // future, but with Windows 2003 it's not possible to commit on demand.
2851 return false;
2852 }
2853
2854 bool os::can_execute_large_page_memory() {
2855 return true;
2856 }
2857
2858 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2859
2860 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2861
2862 if (UseLargePagesIndividualAllocation) {
2863 if (TracePageSizes && Verbose) {
2864 tty->print_cr("Reserving large pages individually.");
2865 }
2866 char * p_buf;
2867 // first reserve enough address space in advance since we want to be
2868 // able to break a single contiguous virtual address range into multiple
2869 // large page commits but WS2003 does not allow reserving large page space
2870 // so we just use 4K pages for reserve, this gives us a legal contiguous
2871 // address space. then we will deallocate that reservation, and re alloc
2872 // using large pages
2873 const size_t size_of_reserve = bytes + _large_page_size;
2874 if (bytes > size_of_reserve) {
2875 // Overflowed.
2876 warning("Individually allocated large pages failed, "
2877 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2878 return NULL;
2879 }
2880 p_buf = (char *) VirtualAlloc(addr,
2881 size_of_reserve, // size of Reserve
2882 MEM_RESERVE,
2883 PAGE_READWRITE);
2884 // If reservation failed, return NULL
2885 if (p_buf == NULL) return NULL;
2886
2887 release_memory(p_buf, bytes + _large_page_size);
2888 // round up to page boundary. If the size_of_reserve did not
2889 // overflow and the reservation did not fail, this align up
2890 // should not overflow.
2891 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2892
2893 // now go through and allocate one page at a time until all bytes are
2894 // allocated
2895 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2896 // An overflow of align_size_up() would have been caught above
2897 // in the calculation of size_of_reserve.
2898 char * next_alloc_addr = p_buf;
2899
2900 #ifdef ASSERT
2901 // Variable for the failure injection
2902 long ran_num = os::random();
2903 size_t fail_after = ran_num % bytes;
2904 #endif
2905
2906 while (bytes_remaining) {
2907 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2908 // Note allocate and commit
2909 char * p_new;
2910
2911 #ifdef ASSERT
2912 bool inject_error = LargePagesIndividualAllocationInjectError &&
2913 (bytes_remaining <= fail_after);
2914 #else
2915 const bool inject_error = false;
2916 #endif
2917
2918 if (inject_error) {
2919 p_new = NULL;
2920 } else {
2921 p_new = (char *) VirtualAlloc(next_alloc_addr,
2922 bytes_to_rq,
2923 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2924 prot);
2925 }
2926
2927 if (p_new == NULL) {
2928 // Free any allocated pages
2929 if (next_alloc_addr > p_buf) {
2930 // Some memory was committed so release it.
2931 size_t bytes_to_release = bytes - bytes_remaining;
2932 release_memory(p_buf, bytes_to_release);
2933 }
2934 #ifdef ASSERT
2935 if (UseLargePagesIndividualAllocation &&
2936 LargePagesIndividualAllocationInjectError) {
2937 if (TracePageSizes && Verbose) {
2938 tty->print_cr("Reserving large pages individually failed.");
2939 }
2940 }
2941 #endif
2942 return NULL;
2943 }
2944 bytes_remaining -= bytes_to_rq;
2945 next_alloc_addr += bytes_to_rq;
2946 }
2947
2948 return p_buf;
2949
2950 } else {
2951 // normal policy just allocate it all at once
2952 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2953 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2954 return res;
2955 }
2956 }
2957
2958 bool os::release_memory_special(char* base, size_t bytes) {
2959 return release_memory(base, bytes);
2960 }
2961
2962 void os::print_statistics() {
2963 }
2964
2965 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2966 if (bytes == 0) {
2967 // Don't bother the OS with noops.
2968 return true;
2969 }
2970 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2971 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2972 // Don't attempt to print anything if the OS call fails. We're
2973 // probably low on resources, so the print itself may cause crashes.
2974 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2975 if (result != NULL && exec) {
2976 DWORD oldprot;
2977 // Windows doc says to use VirtualProtect to get execute permissions
2978 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2979 } else {
2980 return result;
2981 }
2982 }
2983
2984 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2985 bool exec) {
2986 return commit_memory(addr, size, exec);
2987 }
2988
2989 bool os::uncommit_memory(char* addr, size_t bytes) {
2990 if (bytes == 0) {
2991 // Don't bother the OS with noops.
2992 return true;
2993 }
2994 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2995 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2996 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2997 }
2998
2999 bool os::release_memory(char* addr, size_t bytes) {
3000 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3001 }
3002
3003 bool os::create_stack_guard_pages(char* addr, size_t size) {
3004 return os::commit_memory(addr, size);
3005 }
3006
3007 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3008 return os::uncommit_memory(addr, size);
3009 }
3010
3011 // Set protections specified
3012 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3013 bool is_committed) {
3014 unsigned int p = 0;
3015 switch (prot) {
3016 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3017 case MEM_PROT_READ: p = PAGE_READONLY; break;
3018 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3019 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3020 default:
3021 ShouldNotReachHere();
3022 }
3023
3024 DWORD old_status;
3025
3026 // Strange enough, but on Win32 one can change protection only for committed
3027 // memory, not a big deal anyway, as bytes less or equal than 64K
3028 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3029 fatal("cannot commit protection page");
3030 }
3031 // One cannot use os::guard_memory() here, as on Win32 guard page
3032 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3033 //
3034 // Pages in the region become guard pages. Any attempt to access a guard page
3035 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3036 // the guard page status. Guard pages thus act as a one-time access alarm.
3037 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3038 }
3039
3040 bool os::guard_memory(char* addr, size_t bytes) {
3041 DWORD old_status;
3042 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3043 }
3044
3045 bool os::unguard_memory(char* addr, size_t bytes) {
3046 DWORD old_status;
3047 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3048 }
3049
3050 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3051 void os::free_memory(char *addr, size_t bytes) { }
3052 void os::numa_make_global(char *addr, size_t bytes) { }
3053 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3054 bool os::numa_topology_changed() { return false; }
3055 size_t os::numa_get_groups_num() { return 1; }
3056 int os::numa_get_group_id() { return 0; }
3057 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3058 if (size > 0) {
3059 ids[0] = 0;
3060 return 1;
3061 }
3062 return 0;
3063 }
3064
3065 bool os::get_page_info(char *start, page_info* info) {
3066 return false;
3067 }
3068
3069 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3070 return end;
3071 }
3072
3073 char* os::non_memory_address_word() {
3074 // Must never look like an address returned by reserve_memory,
3075 // even in its subfields (as defined by the CPU immediate fields,
3076 // if the CPU splits constants across multiple instructions).
3077 return (char*)-1;
3078 }
3079
3080 #define MAX_ERROR_COUNT 100
3081 #define SYS_THREAD_ERROR 0xffffffffUL
3082
3083 void os::pd_start_thread(Thread* thread) {
3084 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3085 // Returns previous suspend state:
3086 // 0: Thread was not suspended
3087 // 1: Thread is running now
3088 // >1: Thread is still suspended.
3089 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3090 }
3091
3092 class HighResolutionInterval {
3093 // The default timer resolution seems to be 10 milliseconds.
3094 // (Where is this written down?)
3095 // If someone wants to sleep for only a fraction of the default,
3096 // then we set the timer resolution down to 1 millisecond for
3097 // the duration of their interval.
3098 // We carefully set the resolution back, since otherwise we
3099 // seem to incur an overhead (3%?) that we don't need.
3100 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3101 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3102 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3103 // timeBeginPeriod() if the relative error exceeded some threshold.
3104 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3105 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3106 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3107 // resolution timers running.
3108 private:
3109 jlong resolution;
3110 public:
3111 HighResolutionInterval(jlong ms) {
3112 resolution = ms % 10L;
3113 if (resolution != 0) {
3114 MMRESULT result = timeBeginPeriod(1L);
3115 }
3116 }
3117 ~HighResolutionInterval() {
3118 if (resolution != 0) {
3119 MMRESULT result = timeEndPeriod(1L);
3120 }
3121 resolution = 0L;
3122 }
3123 };
3124
3125 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3126 jlong limit = (jlong) MAXDWORD;
3127
3128 while(ms > limit) {
3129 int res;
3130 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3131 return res;
3132 ms -= limit;
3133 }
3134
3135 assert(thread == Thread::current(), "thread consistency check");
3136 OSThread* osthread = thread->osthread();
3137 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3138 int result;
3139 if (interruptable) {
3140 assert(thread->is_Java_thread(), "must be java thread");
3141 JavaThread *jt = (JavaThread *) thread;
3142 ThreadBlockInVM tbivm(jt);
3143
3144 jt->set_suspend_equivalent();
3145 // cleared by handle_special_suspend_equivalent_condition() or
3146 // java_suspend_self() via check_and_wait_while_suspended()
3147
3148 HANDLE events[1];
3149 events[0] = osthread->interrupt_event();
3150 HighResolutionInterval *phri=NULL;
3151 if(!ForceTimeHighResolution)
3152 phri = new HighResolutionInterval( ms );
3153 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3154 result = OS_TIMEOUT;
3155 } else {
3156 ResetEvent(osthread->interrupt_event());
3157 osthread->set_interrupted(false);
3158 result = OS_INTRPT;
3159 }
3160 delete phri; //if it is NULL, harmless
3161
3162 // were we externally suspended while we were waiting?
3163 jt->check_and_wait_while_suspended();
3164 } else {
3165 assert(!thread->is_Java_thread(), "must not be java thread");
3166 Sleep((long) ms);
3167 result = OS_TIMEOUT;
3168 }
3169 return result;
3170 }
3171
3172 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3173 void os::infinite_sleep() {
3174 while (true) { // sleep forever ...
3175 Sleep(100000); // ... 100 seconds at a time
3176 }
3177 }
3178
3179 typedef BOOL (WINAPI * STTSignature)(void) ;
3180
3181 os::YieldResult os::NakedYield() {
3182 // Use either SwitchToThread() or Sleep(0)
3183 // Consider passing back the return value from SwitchToThread().
3184 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
3185 // In that case we revert to Sleep(0).
3186 static volatile STTSignature stt = (STTSignature) 1 ;
3187
3188 if (stt == ((STTSignature) 1)) {
3189 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
3190 // It's OK if threads race during initialization as the operation above is idempotent.
3191 }
3192 if (stt != NULL) {
3193 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3194 } else {
3195 Sleep (0) ;
3196 }
3197 return os::YIELD_UNKNOWN ;
3198 }
3199
3200 void os::yield() { os::NakedYield(); }
3201
3202 void os::yield_all(int attempts) {
3203 // Yields to all threads, including threads with lower priorities
3204 Sleep(1);
3205 }
3206
3207 // Win32 only gives you access to seven real priorities at a time,
3208 // so we compress Java's ten down to seven. It would be better
3209 // if we dynamically adjusted relative priorities.
3210
3211 int os::java_to_os_priority[MaxPriority + 1] = {
3212 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3213 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3214 THREAD_PRIORITY_LOWEST, // 2
3215 THREAD_PRIORITY_BELOW_NORMAL, // 3
3216 THREAD_PRIORITY_BELOW_NORMAL, // 4
3217 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3218 THREAD_PRIORITY_NORMAL, // 6
3219 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3220 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3221 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3222 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3223 };
3224
3225 int prio_policy1[MaxPriority + 1] = {
3226 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3227 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3228 THREAD_PRIORITY_LOWEST, // 2
3229 THREAD_PRIORITY_BELOW_NORMAL, // 3
3230 THREAD_PRIORITY_BELOW_NORMAL, // 4
3231 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3232 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3233 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3234 THREAD_PRIORITY_HIGHEST, // 8
3235 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3236 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3237 };
3238
3239 static int prio_init() {
3240 // If ThreadPriorityPolicy is 1, switch tables
3241 if (ThreadPriorityPolicy == 1) {
3242 int i;
3243 for (i = 0; i < MaxPriority + 1; i++) {
3244 os::java_to_os_priority[i] = prio_policy1[i];
3245 }
3246 }
3247 return 0;
3248 }
3249
3250 OSReturn os::set_native_priority(Thread* thread, int priority) {
3251 if (!UseThreadPriorities) return OS_OK;
3252 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3253 return ret ? OS_OK : OS_ERR;
3254 }
3255
3256 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3257 if ( !UseThreadPriorities ) {
3258 *priority_ptr = java_to_os_priority[NormPriority];
3259 return OS_OK;
3260 }
3261 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3262 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3263 assert(false, "GetThreadPriority failed");
3264 return OS_ERR;
3265 }
3266 *priority_ptr = os_prio;
3267 return OS_OK;
3268 }
3269
3270
3271 // Hint to the underlying OS that a task switch would not be good.
3272 // Void return because it's a hint and can fail.
3273 void os::hint_no_preempt() {}
3274
3275 void os::interrupt(Thread* thread) {
3276 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3277 "possibility of dangling Thread pointer");
3278
3279 OSThread* osthread = thread->osthread();
3280 osthread->set_interrupted(true);
3281 // More than one thread can get here with the same value of osthread,
3282 // resulting in multiple notifications. We do, however, want the store
3283 // to interrupted() to be visible to other threads before we post
3284 // the interrupt event.
3285 OrderAccess::release();
3286 SetEvent(osthread->interrupt_event());
3287 // For JSR166: unpark after setting status
3288 if (thread->is_Java_thread())
3289 ((JavaThread*)thread)->parker()->unpark();
3290
3291 ParkEvent * ev = thread->_ParkEvent ;
3292 if (ev != NULL) ev->unpark() ;
3293
3294 }
3295
3296
3297 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3298 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3299 "possibility of dangling Thread pointer");
3300
3301 OSThread* osthread = thread->osthread();
3302 bool interrupted;
3303 interrupted = osthread->interrupted();
3304 if (clear_interrupted == true) {
3305 osthread->set_interrupted(false);
3306 ResetEvent(osthread->interrupt_event());
3307 } // Otherwise leave the interrupted state alone
3308
3309 return interrupted;
3310 }
3311
3312 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3313 ExtendedPC os::get_thread_pc(Thread* thread) {
3314 CONTEXT context;
3315 context.ContextFlags = CONTEXT_CONTROL;
3316 HANDLE handle = thread->osthread()->thread_handle();
3317 #ifdef _M_IA64
3318 assert(0, "Fix get_thread_pc");
3319 return ExtendedPC(NULL);
3320 #else
3321 if (GetThreadContext(handle, &context)) {
3322 #ifdef _M_AMD64
3323 return ExtendedPC((address) context.Rip);
3324 #else
3325 return ExtendedPC((address) context.Eip);
3326 #endif
3327 } else {
3328 return ExtendedPC(NULL);
3329 }
3330 #endif
3331 }
3332
3333 // GetCurrentThreadId() returns DWORD
3334 intx os::current_thread_id() { return GetCurrentThreadId(); }
3335
3336 static int _initial_pid = 0;
3337
3338 int os::current_process_id()
3339 {
3340 return (_initial_pid ? _initial_pid : _getpid());
3341 }
3342
3343 int os::win32::_vm_page_size = 0;
3344 int os::win32::_vm_allocation_granularity = 0;
3345 int os::win32::_processor_type = 0;
3346 // Processor level is not available on non-NT systems, use vm_version instead
3347 int os::win32::_processor_level = 0;
3348 julong os::win32::_physical_memory = 0;
3349 size_t os::win32::_default_stack_size = 0;
3350
3351 intx os::win32::_os_thread_limit = 0;
3352 volatile intx os::win32::_os_thread_count = 0;
3353
3354 bool os::win32::_is_nt = false;
3355 bool os::win32::_is_windows_2003 = false;
3356 bool os::win32::_is_windows_server = false;
3357
3358 void os::win32::initialize_system_info() {
3359 SYSTEM_INFO si;
3360 GetSystemInfo(&si);
3361 _vm_page_size = si.dwPageSize;
3362 _vm_allocation_granularity = si.dwAllocationGranularity;
3363 _processor_type = si.dwProcessorType;
3364 _processor_level = si.wProcessorLevel;
3365 set_processor_count(si.dwNumberOfProcessors);
3366
3367 MEMORYSTATUSEX ms;
3368 ms.dwLength = sizeof(ms);
3369
3370 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3371 // dwMemoryLoad (% of memory in use)
3372 GlobalMemoryStatusEx(&ms);
3373 _physical_memory = ms.ullTotalPhys;
3374
3375 OSVERSIONINFOEX oi;
3376 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3377 GetVersionEx((OSVERSIONINFO*)&oi);
3378 switch(oi.dwPlatformId) {
3379 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3380 case VER_PLATFORM_WIN32_NT:
3381 _is_nt = true;
3382 {
3383 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3384 if (os_vers == 5002) {
3385 _is_windows_2003 = true;
3386 }
3387 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3388 oi.wProductType == VER_NT_SERVER) {
3389 _is_windows_server = true;
3390 }
3391 }
3392 break;
3393 default: fatal("Unknown platform");
3394 }
3395
3396 _default_stack_size = os::current_stack_size();
3397 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3398 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3399 "stack size not a multiple of page size");
3400
3401 initialize_performance_counter();
3402
3403 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3404 // known to deadlock the system, if the VM issues to thread operations with
3405 // a too high frequency, e.g., such as changing the priorities.
3406 // The 6000 seems to work well - no deadlocks has been notices on the test
3407 // programs that we have seen experience this problem.
3408 if (!os::win32::is_nt()) {
3409 StarvationMonitorInterval = 6000;
3410 }
3411 }
3412
3413
3414 void os::win32::setmode_streams() {
3415 _setmode(_fileno(stdin), _O_BINARY);
3416 _setmode(_fileno(stdout), _O_BINARY);
3417 _setmode(_fileno(stderr), _O_BINARY);
3418 }
3419
3420
3421 int os::message_box(const char* title, const char* message) {
3422 int result = MessageBox(NULL, message, title,
3423 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3424 return result == IDYES;
3425 }
3426
3427 int os::allocate_thread_local_storage() {
3428 return TlsAlloc();
3429 }
3430
3431
3432 void os::free_thread_local_storage(int index) {
3433 TlsFree(index);
3434 }
3435
3436
3437 void os::thread_local_storage_at_put(int index, void* value) {
3438 TlsSetValue(index, value);
3439 assert(thread_local_storage_at(index) == value, "Just checking");
3440 }
3441
3442
3443 void* os::thread_local_storage_at(int index) {
3444 return TlsGetValue(index);
3445 }
3446
3447
3448 #ifndef PRODUCT
3449 #ifndef _WIN64
3450 // Helpers to check whether NX protection is enabled
3451 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3452 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3453 pex->ExceptionRecord->NumberParameters > 0 &&
3454 pex->ExceptionRecord->ExceptionInformation[0] ==
3455 EXCEPTION_INFO_EXEC_VIOLATION) {
3456 return EXCEPTION_EXECUTE_HANDLER;
3457 }
3458 return EXCEPTION_CONTINUE_SEARCH;
3459 }
3460
3461 void nx_check_protection() {
3462 // If NX is enabled we'll get an exception calling into code on the stack
3463 char code[] = { (char)0xC3 }; // ret
3464 void *code_ptr = (void *)code;
3465 __try {
3466 __asm call code_ptr
3467 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3468 tty->print_raw_cr("NX protection detected.");
3469 }
3470 }
3471 #endif // _WIN64
3472 #endif // PRODUCT
3473
3474 // this is called _before_ the global arguments have been parsed
3475 void os::init(void) {
3476 _initial_pid = _getpid();
3477
3478 init_random(1234567);
3479
3480 win32::initialize_system_info();
3481 win32::setmode_streams();
3482 init_page_sizes((size_t) win32::vm_page_size());
3483
3484 // For better scalability on MP systems (must be called after initialize_system_info)
3485 #ifndef PRODUCT
3486 if (is_MP()) {
3487 NoYieldsInMicrolock = true;
3488 }
3489 #endif
3490 // This may be overridden later when argument processing is done.
3491 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3492 os::win32::is_windows_2003());
3493
3494 // Initialize main_process and main_thread
3495 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3496 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3497 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3498 fatal("DuplicateHandle failed\n");
3499 }
3500 main_thread_id = (int) GetCurrentThreadId();
3501 }
3502
3503 // To install functions for atexit processing
3504 extern "C" {
3505 static void perfMemory_exit_helper() {
3506 perfMemory_exit();
3507 }
3508 }
3509
3510 // this is called _after_ the global arguments have been parsed
3511 jint os::init_2(void) {
3512 // Allocate a single page and mark it as readable for safepoint polling
3513 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3514 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3515
3516 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3517 guarantee( return_page != NULL, "Commit Failed for polling page");
3518
3519 os::set_polling_page( polling_page );
3520
3521 #ifndef PRODUCT
3522 if( Verbose && PrintMiscellaneous )
3523 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3524 #endif
3525
3526 if (!UseMembar) {
3527 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3528 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3529
3530 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3531 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3532
3533 os::set_memory_serialize_page( mem_serialize_page );
3534
3535 #ifndef PRODUCT
3536 if(Verbose && PrintMiscellaneous)
3537 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3538 #endif
3539 }
3540
3541 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3542
3543 // Setup Windows Exceptions
3544
3545 // On Itanium systems, Structured Exception Handling does not
3546 // work since stack frames must be walkable by the OS. Since
3547 // much of our code is dynamically generated, and we do not have
3548 // proper unwind .xdata sections, the system simply exits
3549 // rather than delivering the exception. To work around
3550 // this we use VectorExceptions instead.
3551 #ifdef _WIN64
3552 if (UseVectoredExceptions) {
3553 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3554 }
3555 #endif
3556
3557 // for debugging float code generation bugs
3558 if (ForceFloatExceptions) {
3559 #ifndef _WIN64
3560 static long fp_control_word = 0;
3561 __asm { fstcw fp_control_word }
3562 // see Intel PPro Manual, Vol. 2, p 7-16
3563 const long precision = 0x20;
3564 const long underflow = 0x10;
3565 const long overflow = 0x08;
3566 const long zero_div = 0x04;
3567 const long denorm = 0x02;
3568 const long invalid = 0x01;
3569 fp_control_word |= invalid;
3570 __asm { fldcw fp_control_word }
3571 #endif
3572 }
3573
3574 // If stack_commit_size is 0, windows will reserve the default size,
3575 // but only commit a small portion of it.
3576 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3577 size_t default_reserve_size = os::win32::default_stack_size();
3578 size_t actual_reserve_size = stack_commit_size;
3579 if (stack_commit_size < default_reserve_size) {
3580 // If stack_commit_size == 0, we want this too
3581 actual_reserve_size = default_reserve_size;
3582 }
3583
3584 // Check minimum allowable stack size for thread creation and to initialize
3585 // the java system classes, including StackOverflowError - depends on page
3586 // size. Add a page for compiler2 recursion in main thread.
3587 // Add in 2*BytesPerWord times page size to account for VM stack during
3588 // class initialization depending on 32 or 64 bit VM.
3589 size_t min_stack_allowed =
3590 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3591 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3592 if (actual_reserve_size < min_stack_allowed) {
3593 tty->print_cr("\nThe stack size specified is too small, "
3594 "Specify at least %dk",
3595 min_stack_allowed / K);
3596 return JNI_ERR;
3597 }
3598
3599 JavaThread::set_stack_size_at_create(stack_commit_size);
3600
3601 // Calculate theoretical max. size of Threads to guard gainst artifical
3602 // out-of-memory situations, where all available address-space has been
3603 // reserved by thread stacks.
3604 assert(actual_reserve_size != 0, "Must have a stack");
3605
3606 // Calculate the thread limit when we should start doing Virtual Memory
3607 // banging. Currently when the threads will have used all but 200Mb of space.
3608 //
3609 // TODO: consider performing a similar calculation for commit size instead
3610 // as reserve size, since on a 64-bit platform we'll run into that more
3611 // often than running out of virtual memory space. We can use the
3612 // lower value of the two calculations as the os_thread_limit.
3613 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3614 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3615
3616 // at exit methods are called in the reverse order of their registration.
3617 // there is no limit to the number of functions registered. atexit does
3618 // not set errno.
3619
3620 if (PerfAllowAtExitRegistration) {
3621 // only register atexit functions if PerfAllowAtExitRegistration is set.
3622 // atexit functions can be delayed until process exit time, which
3623 // can be problematic for embedded VM situations. Embedded VMs should
3624 // call DestroyJavaVM() to assure that VM resources are released.
3625
3626 // note: perfMemory_exit_helper atexit function may be removed in
3627 // the future if the appropriate cleanup code can be added to the
3628 // VM_Exit VMOperation's doit method.
3629 if (atexit(perfMemory_exit_helper) != 0) {
3630 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3631 }
3632 }
3633
3634 // initialize PSAPI or ToolHelp for fatal error handler
3635 if (win32::is_nt()) _init_psapi();
3636 else _init_toolhelp();
3637
3638 #ifndef _WIN64
3639 // Print something if NX is enabled (win32 on AMD64)
3640 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3641 #endif
3642
3643 // initialize thread priority policy
3644 prio_init();
3645
3646 if (UseNUMA && !ForceNUMA) {
3647 UseNUMA = false; // Currently unsupported.
3648 }
3649
3650 return JNI_OK;
3651 }
3652
3653 void os::init_3(void) {
3654 return;
3655 }
3656
3657 // Mark the polling page as unreadable
3658 void os::make_polling_page_unreadable(void) {
3659 DWORD old_status;
3660 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3661 fatal("Could not disable polling page");
3662 };
3663
3664 // Mark the polling page as readable
3665 void os::make_polling_page_readable(void) {
3666 DWORD old_status;
3667 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3668 fatal("Could not enable polling page");
3669 };
3670
3671
3672 int os::stat(const char *path, struct stat *sbuf) {
3673 char pathbuf[MAX_PATH];
3674 if (strlen(path) > MAX_PATH - 1) {
3675 errno = ENAMETOOLONG;
3676 return -1;
3677 }
3678 os::native_path(strcpy(pathbuf, path));
3679 int ret = ::stat(pathbuf, sbuf);
3680 if (sbuf != NULL && UseUTCFileTimestamp) {
3681 // Fix for 6539723. st_mtime returned from stat() is dependent on
3682 // the system timezone and so can return different values for the
3683 // same file if/when daylight savings time changes. This adjustment
3684 // makes sure the same timestamp is returned regardless of the TZ.
3685 //
3686 // See:
3687 // http://msdn.microsoft.com/library/
3688 // default.asp?url=/library/en-us/sysinfo/base/
3689 // time_zone_information_str.asp
3690 // and
3691 // http://msdn.microsoft.com/library/default.asp?url=
3692 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3693 //
3694 // NOTE: there is a insidious bug here: If the timezone is changed
3695 // after the call to stat() but before 'GetTimeZoneInformation()', then
3696 // the adjustment we do here will be wrong and we'll return the wrong
3697 // value (which will likely end up creating an invalid class data
3698 // archive). Absent a better API for this, or some time zone locking
3699 // mechanism, we'll have to live with this risk.
3700 TIME_ZONE_INFORMATION tz;
3701 DWORD tzid = GetTimeZoneInformation(&tz);
3702 int daylightBias =
3703 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3704 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3705 }
3706 return ret;
3707 }
3708
3709
3710 #define FT2INT64(ft) \
3711 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3712
3713
3714 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3715 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3716 // of a thread.
3717 //
3718 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3719 // the fast estimate available on the platform.
3720
3721 // current_thread_cpu_time() is not optimized for Windows yet
3722 jlong os::current_thread_cpu_time() {
3723 // return user + sys since the cost is the same
3724 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3725 }
3726
3727 jlong os::thread_cpu_time(Thread* thread) {
3728 // consistent with what current_thread_cpu_time() returns.
3729 return os::thread_cpu_time(thread, true /* user+sys */);
3730 }
3731
3732 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3733 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3734 }
3735
3736 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3737 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3738 // If this function changes, os::is_thread_cpu_time_supported() should too
3739 if (os::win32::is_nt()) {
3740 FILETIME CreationTime;
3741 FILETIME ExitTime;
3742 FILETIME KernelTime;
3743 FILETIME UserTime;
3744
3745 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3746 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3747 return -1;
3748 else
3749 if (user_sys_cpu_time) {
3750 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3751 } else {
3752 return FT2INT64(UserTime) * 100;
3753 }
3754 } else {
3755 return (jlong) timeGetTime() * 1000000;
3756 }
3757 }
3758
3759 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3760 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3761 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3762 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3763 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3764 }
3765
3766 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3767 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3768 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3769 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3770 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3771 }
3772
3773 bool os::is_thread_cpu_time_supported() {
3774 // see os::thread_cpu_time
3775 if (os::win32::is_nt()) {
3776 FILETIME CreationTime;
3777 FILETIME ExitTime;
3778 FILETIME KernelTime;
3779 FILETIME UserTime;
3780
3781 if ( GetThreadTimes(GetCurrentThread(),
3782 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3783 return false;
3784 else
3785 return true;
3786 } else {
3787 return false;
3788 }
3789 }
3790
3791 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3792 // It does have primitives (PDH API) to get CPU usage and run queue length.
3793 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3794 // If we wanted to implement loadavg on Windows, we have a few options:
3795 //
3796 // a) Query CPU usage and run queue length and "fake" an answer by
3797 // returning the CPU usage if it's under 100%, and the run queue
3798 // length otherwise. It turns out that querying is pretty slow
3799 // on Windows, on the order of 200 microseconds on a fast machine.
3800 // Note that on the Windows the CPU usage value is the % usage
3801 // since the last time the API was called (and the first call
3802 // returns 100%), so we'd have to deal with that as well.
3803 //
3804 // b) Sample the "fake" answer using a sampling thread and store
3805 // the answer in a global variable. The call to loadavg would
3806 // just return the value of the global, avoiding the slow query.
3807 //
3808 // c) Sample a better answer using exponential decay to smooth the
3809 // value. This is basically the algorithm used by UNIX kernels.
3810 //
3811 // Note that sampling thread starvation could affect both (b) and (c).
3812 int os::loadavg(double loadavg[], int nelem) {
3813 return -1;
3814 }
3815
3816
3817 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3818 bool os::dont_yield() {
3819 return DontYieldALot;
3820 }
3821
3822 // This method is a slightly reworked copy of JDK's sysOpen
3823 // from src/windows/hpi/src/sys_api_md.c
3824
3825 int os::open(const char *path, int oflag, int mode) {
3826 char pathbuf[MAX_PATH];
3827
3828 if (strlen(path) > MAX_PATH - 1) {
3829 errno = ENAMETOOLONG;
3830 return -1;
3831 }
3832 os::native_path(strcpy(pathbuf, path));
3833 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
3834 }
3835
3836 // Is a (classpath) directory empty?
3837 bool os::dir_is_empty(const char* path) {
3838 WIN32_FIND_DATA fd;
3839 HANDLE f = FindFirstFile(path, &fd);
3840 if (f == INVALID_HANDLE_VALUE) {
3841 return true;
3842 }
3843 FindClose(f);
3844 return false;
3845 }
3846
3847 // create binary file, rewriting existing file if required
3848 int os::create_binary_file(const char* path, bool rewrite_existing) {
3849 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3850 if (!rewrite_existing) {
3851 oflags |= _O_EXCL;
3852 }
3853 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3854 }
3855
3856 // return current position of file pointer
3857 jlong os::current_file_offset(int fd) {
3858 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3859 }
3860
3861 // move file pointer to the specified offset
3862 jlong os::seek_to_file_offset(int fd, jlong offset) {
3863 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3864 }
3865
3866
3867 jlong os::lseek(int fd, jlong offset, int whence) {
3868 return (jlong) ::_lseeki64(fd, offset, whence);
3869 }
3870
3871 // This method is a slightly reworked copy of JDK's sysNativePath
3872 // from src/windows/hpi/src/path_md.c
3873
3874 /* Convert a pathname to native format. On win32, this involves forcing all
3875 separators to be '\\' rather than '/' (both are legal inputs, but Win95
3876 sometimes rejects '/') and removing redundant separators. The input path is
3877 assumed to have been converted into the character encoding used by the local
3878 system. Because this might be a double-byte encoding, care is taken to
3879 treat double-byte lead characters correctly.
3880
3881 This procedure modifies the given path in place, as the result is never
3882 longer than the original. There is no error return; this operation always
3883 succeeds. */
3884 char * os::native_path(char *path) {
3885 char *src = path, *dst = path, *end = path;
3886 char *colon = NULL; /* If a drive specifier is found, this will
3887 point to the colon following the drive
3888 letter */
3889
3890 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
3891 assert(((!::IsDBCSLeadByte('/'))
3892 && (!::IsDBCSLeadByte('\\'))
3893 && (!::IsDBCSLeadByte(':'))),
3894 "Illegal lead byte");
3895
3896 /* Check for leading separators */
3897 #define isfilesep(c) ((c) == '/' || (c) == '\\')
3898 while (isfilesep(*src)) {
3899 src++;
3900 }
3901
3902 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
3903 /* Remove leading separators if followed by drive specifier. This
3904 hack is necessary to support file URLs containing drive
3905 specifiers (e.g., "file://c:/path"). As a side effect,
3906 "/c:/path" can be used as an alternative to "c:/path". */
3907 *dst++ = *src++;
3908 colon = dst;
3909 *dst++ = ':';
3910 src++;
3911 } else {
3912 src = path;
3913 if (isfilesep(src[0]) && isfilesep(src[1])) {
3914 /* UNC pathname: Retain first separator; leave src pointed at
3915 second separator so that further separators will be collapsed
3916 into the second separator. The result will be a pathname
3917 beginning with "\\\\" followed (most likely) by a host name. */
3918 src = dst = path + 1;
3919 path[0] = '\\'; /* Force first separator to '\\' */
3920 }
3921 }
3922
3923 end = dst;
3924
3925 /* Remove redundant separators from remainder of path, forcing all
3926 separators to be '\\' rather than '/'. Also, single byte space
3927 characters are removed from the end of the path because those
3928 are not legal ending characters on this operating system.
3929 */
3930 while (*src != '\0') {
3931 if (isfilesep(*src)) {
3932 *dst++ = '\\'; src++;
3933 while (isfilesep(*src)) src++;
3934 if (*src == '\0') {
3935 /* Check for trailing separator */
3936 end = dst;
3937 if (colon == dst - 2) break; /* "z:\\" */
3938 if (dst == path + 1) break; /* "\\" */
3939 if (dst == path + 2 && isfilesep(path[0])) {
3940 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
3941 beginning of a UNC pathname. Even though it is not, by
3942 itself, a valid UNC pathname, we leave it as is in order
3943 to be consistent with the path canonicalizer as well
3944 as the win32 APIs, which treat this case as an invalid
3945 UNC pathname rather than as an alias for the root
3946 directory of the current drive. */
3947 break;
3948 }
3949 end = --dst; /* Path does not denote a root directory, so
3950 remove trailing separator */
3951 break;
3952 }
3953 end = dst;
3954 } else {
3955 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
3956 *dst++ = *src++;
3957 if (*src) *dst++ = *src++;
3958 end = dst;
3959 } else { /* Copy a single-byte character */
3960 char c = *src++;
3961 *dst++ = c;
3962 /* Space is not a legal ending character */
3963 if (c != ' ') end = dst;
3964 }
3965 }
3966 }
3967
3968 *end = '\0';
3969
3970 /* For "z:", add "." to work around a bug in the C runtime library */
3971 if (colon == dst - 1) {
3972 path[2] = '.';
3973 path[3] = '\0';
3974 }
3975
3976 #ifdef DEBUG
3977 jio_fprintf(stderr, "sysNativePath: %s\n", path);
3978 #endif DEBUG
3979 return path;
3980 }
3981
3982 // This code is a copy of JDK's sysSetLength
3983 // from src/windows/hpi/src/sys_api_md.c
3984
3985 int os::ftruncate(int fd, jlong length) {
3986 HANDLE h = (HANDLE)::_get_osfhandle(fd);
3987 long high = (long)(length >> 32);
3988 DWORD ret;
3989
3990 if (h == (HANDLE)(-1)) {
3991 return -1;
3992 }
3993
3994 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
3995 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
3996 return -1;
3997 }
3998
3999 if (::SetEndOfFile(h) == FALSE) {
4000 return -1;
4001 }
4002
4003 return 0;
4004 }
4005
4006
4007 // This code is a copy of JDK's sysSync
4008 // from src/windows/hpi/src/sys_api_md.c
4009 // except for the legacy workaround for a bug in Win 98
4010
4011 int os::fsync(int fd) {
4012 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4013
4014 if ( (!::FlushFileBuffers(handle)) &&
4015 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4016 /* from winerror.h */
4017 return -1;
4018 }
4019 return 0;
4020 }
4021
4022 static int nonSeekAvailable(int, long *);
4023 static int stdinAvailable(int, long *);
4024
4025 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4026 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4027
4028 // This code is a copy of JDK's sysAvailable
4029 // from src/windows/hpi/src/sys_api_md.c
4030
4031 int os::available(int fd, jlong *bytes) {
4032 jlong cur, end;
4033 struct _stati64 stbuf64;
4034
4035 if (::_fstati64(fd, &stbuf64) >= 0) {
4036 int mode = stbuf64.st_mode;
4037 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4038 int ret;
4039 long lpbytes;
4040 if (fd == 0) {
4041 ret = stdinAvailable(fd, &lpbytes);
4042 } else {
4043 ret = nonSeekAvailable(fd, &lpbytes);
4044 }
4045 (*bytes) = (jlong)(lpbytes);
4046 return ret;
4047 }
4048 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4049 return FALSE;
4050 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4051 return FALSE;
4052 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4053 return FALSE;
4054 }
4055 *bytes = end - cur;
4056 return TRUE;
4057 } else {
4058 return FALSE;
4059 }
4060 }
4061
4062 // This code is a copy of JDK's nonSeekAvailable
4063 // from src/windows/hpi/src/sys_api_md.c
4064
4065 static int nonSeekAvailable(int fd, long *pbytes) {
4066 /* This is used for available on non-seekable devices
4067 * (like both named and anonymous pipes, such as pipes
4068 * connected to an exec'd process).
4069 * Standard Input is a special case.
4070 *
4071 */
4072 HANDLE han;
4073
4074 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4075 return FALSE;
4076 }
4077
4078 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4079 /* PeekNamedPipe fails when at EOF. In that case we
4080 * simply make *pbytes = 0 which is consistent with the
4081 * behavior we get on Solaris when an fd is at EOF.
4082 * The only alternative is to raise an Exception,
4083 * which isn't really warranted.
4084 */
4085 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4086 return FALSE;
4087 }
4088 *pbytes = 0;
4089 }
4090 return TRUE;
4091 }
4092
4093 #define MAX_INPUT_EVENTS 2000
4094
4095 // This code is a copy of JDK's stdinAvailable
4096 // from src/windows/hpi/src/sys_api_md.c
4097
4098 static int stdinAvailable(int fd, long *pbytes) {
4099 HANDLE han;
4100 DWORD numEventsRead = 0; /* Number of events read from buffer */
4101 DWORD numEvents = 0; /* Number of events in buffer */
4102 DWORD i = 0; /* Loop index */
4103 DWORD curLength = 0; /* Position marker */
4104 DWORD actualLength = 0; /* Number of bytes readable */
4105 BOOL error = FALSE; /* Error holder */
4106 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4107
4108 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4109 return FALSE;
4110 }
4111
4112 /* Construct an array of input records in the console buffer */
4113 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4114 if (error == 0) {
4115 return nonSeekAvailable(fd, pbytes);
4116 }
4117
4118 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4119 if (numEvents > MAX_INPUT_EVENTS) {
4120 numEvents = MAX_INPUT_EVENTS;
4121 }
4122
4123 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD));
4124 if (lpBuffer == NULL) {
4125 return FALSE;
4126 }
4127
4128 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4129 if (error == 0) {
4130 os::free(lpBuffer);
4131 return FALSE;
4132 }
4133
4134 /* Examine input records for the number of bytes available */
4135 for(i=0; i<numEvents; i++) {
4136 if (lpBuffer[i].EventType == KEY_EVENT) {
4137
4138 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4139 &(lpBuffer[i].Event);
4140 if (keyRecord->bKeyDown == TRUE) {
4141 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4142 curLength++;
4143 if (*keyPressed == '\r') {
4144 actualLength = curLength;
4145 }
4146 }
4147 }
4148 }
4149
4150 if(lpBuffer != NULL) {
4151 os::free(lpBuffer);
4152 }
4153
4154 *pbytes = (long) actualLength;
4155 return TRUE;
4156 }
4157
4158 // Map a block of memory.
4159 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
4160 char *addr, size_t bytes, bool read_only,
4161 bool allow_exec) {
4162 HANDLE hFile;
4163 char* base;
4164
4165 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4166 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4167 if (hFile == NULL) {
4168 if (PrintMiscellaneous && Verbose) {
4169 DWORD err = GetLastError();
4170 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
4171 }
4172 return NULL;
4173 }
4174
4175 if (allow_exec) {
4176 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4177 // unless it comes from a PE image (which the shared archive is not.)
4178 // Even VirtualProtect refuses to give execute access to mapped memory
4179 // that was not previously executable.
4180 //
4181 // Instead, stick the executable region in anonymous memory. Yuck.
4182 // Penalty is that ~4 pages will not be shareable - in the future
4183 // we might consider DLLizing the shared archive with a proper PE
4184 // header so that mapping executable + sharing is possible.
4185
4186 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4187 PAGE_READWRITE);
4188 if (base == NULL) {
4189 if (PrintMiscellaneous && Verbose) {
4190 DWORD err = GetLastError();
4191 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4192 }
4193 CloseHandle(hFile);
4194 return NULL;
4195 }
4196
4197 DWORD bytes_read;
4198 OVERLAPPED overlapped;
4199 overlapped.Offset = (DWORD)file_offset;
4200 overlapped.OffsetHigh = 0;
4201 overlapped.hEvent = NULL;
4202 // ReadFile guarantees that if the return value is true, the requested
4203 // number of bytes were read before returning.
4204 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4205 if (!res) {
4206 if (PrintMiscellaneous && Verbose) {
4207 DWORD err = GetLastError();
4208 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4209 }
4210 release_memory(base, bytes);
4211 CloseHandle(hFile);
4212 return NULL;
4213 }
4214 } else {
4215 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4216 NULL /*file_name*/);
4217 if (hMap == NULL) {
4218 if (PrintMiscellaneous && Verbose) {
4219 DWORD err = GetLastError();
4220 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
4221 }
4222 CloseHandle(hFile);
4223 return NULL;
4224 }
4225
4226 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4227 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4228 (DWORD)bytes, addr);
4229 if (base == NULL) {
4230 if (PrintMiscellaneous && Verbose) {
4231 DWORD err = GetLastError();
4232 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4233 }
4234 CloseHandle(hMap);
4235 CloseHandle(hFile);
4236 return NULL;
4237 }
4238
4239 if (CloseHandle(hMap) == 0) {
4240 if (PrintMiscellaneous && Verbose) {
4241 DWORD err = GetLastError();
4242 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4243 }
4244 CloseHandle(hFile);
4245 return base;
4246 }
4247 }
4248
4249 if (allow_exec) {
4250 DWORD old_protect;
4251 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4252 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4253
4254 if (!res) {
4255 if (PrintMiscellaneous && Verbose) {
4256 DWORD err = GetLastError();
4257 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4258 }
4259 // Don't consider this a hard error, on IA32 even if the
4260 // VirtualProtect fails, we should still be able to execute
4261 CloseHandle(hFile);
4262 return base;
4263 }
4264 }
4265
4266 if (CloseHandle(hFile) == 0) {
4267 if (PrintMiscellaneous && Verbose) {
4268 DWORD err = GetLastError();
4269 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4270 }
4271 return base;
4272 }
4273
4274 return base;
4275 }
4276
4277
4278 // Remap a block of memory.
4279 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
4280 char *addr, size_t bytes, bool read_only,
4281 bool allow_exec) {
4282 // This OS does not allow existing memory maps to be remapped so we
4283 // have to unmap the memory before we remap it.
4284 if (!os::unmap_memory(addr, bytes)) {
4285 return NULL;
4286 }
4287
4288 // There is a very small theoretical window between the unmap_memory()
4289 // call above and the map_memory() call below where a thread in native
4290 // code may be able to access an address that is no longer mapped.
4291
4292 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4293 allow_exec);
4294 }
4295
4296
4297 // Unmap a block of memory.
4298 // Returns true=success, otherwise false.
4299
4300 bool os::unmap_memory(char* addr, size_t bytes) {
4301 BOOL result = UnmapViewOfFile(addr);
4302 if (result == 0) {
4303 if (PrintMiscellaneous && Verbose) {
4304 DWORD err = GetLastError();
4305 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4306 }
4307 return false;
4308 }
4309 return true;
4310 }
4311
4312 void os::pause() {
4313 char filename[MAX_PATH];
4314 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4315 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4316 } else {
4317 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4318 }
4319
4320 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4321 if (fd != -1) {
4322 struct stat buf;
4323 ::close(fd);
4324 while (::stat(filename, &buf) == 0) {
4325 Sleep(100);
4326 }
4327 } else {
4328 jio_fprintf(stderr,
4329 "Could not open pause file '%s', continuing immediately.\n", filename);
4330 }
4331 }
4332
4333 // An Event wraps a win32 "CreateEvent" kernel handle.
4334 //
4335 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4336 //
4337 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4338 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4339 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4340 // In addition, an unpark() operation might fetch the handle field, but the
4341 // event could recycle between the fetch and the SetEvent() operation.
4342 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4343 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4344 // on an stale but recycled handle would be harmless, but in practice this might
4345 // confuse other non-Sun code, so it's not a viable approach.
4346 //
4347 // 2: Once a win32 event handle is associated with an Event, it remains associated
4348 // with the Event. The event handle is never closed. This could be construed
4349 // as handle leakage, but only up to the maximum # of threads that have been extant
4350 // at any one time. This shouldn't be an issue, as windows platforms typically
4351 // permit a process to have hundreds of thousands of open handles.
4352 //
4353 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4354 // and release unused handles.
4355 //
4356 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4357 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4358 //
4359 // 5. Use an RCU-like mechanism (Read-Copy Update).
4360 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4361 //
4362 // We use (2).
4363 //
4364 // TODO-FIXME:
4365 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4366 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4367 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4368 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4369 // into a single win32 CreateEvent() handle.
4370 //
4371 // _Event transitions in park()
4372 // -1 => -1 : illegal
4373 // 1 => 0 : pass - return immediately
4374 // 0 => -1 : block
4375 //
4376 // _Event serves as a restricted-range semaphore :
4377 // -1 : thread is blocked
4378 // 0 : neutral - thread is running or ready
4379 // 1 : signaled - thread is running or ready
4380 //
4381 // Another possible encoding of _Event would be
4382 // with explicit "PARKED" and "SIGNALED" bits.
4383
4384 int os::PlatformEvent::park (jlong Millis) {
4385 guarantee (_ParkHandle != NULL , "Invariant") ;
4386 guarantee (Millis > 0 , "Invariant") ;
4387 int v ;
4388
4389 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4390 // the initial park() operation.
4391
4392 for (;;) {
4393 v = _Event ;
4394 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4395 }
4396 guarantee ((v == 0) || (v == 1), "invariant") ;
4397 if (v != 0) return OS_OK ;
4398
4399 // Do this the hard way by blocking ...
4400 // TODO: consider a brief spin here, gated on the success of recent
4401 // spin attempts by this thread.
4402 //
4403 // We decompose long timeouts into series of shorter timed waits.
4404 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4405 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4406 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4407 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4408 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4409 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4410 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4411 // for the already waited time. This policy does not admit any new outcomes.
4412 // In the future, however, we might want to track the accumulated wait time and
4413 // adjust Millis accordingly if we encounter a spurious wakeup.
4414
4415 const int MAXTIMEOUT = 0x10000000 ;
4416 DWORD rv = WAIT_TIMEOUT ;
4417 while (_Event < 0 && Millis > 0) {
4418 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4419 if (Millis > MAXTIMEOUT) {
4420 prd = MAXTIMEOUT ;
4421 }
4422 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4423 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4424 if (rv == WAIT_TIMEOUT) {
4425 Millis -= prd ;
4426 }
4427 }
4428 v = _Event ;
4429 _Event = 0 ;
4430 OrderAccess::fence() ;
4431 // If we encounter a nearly simultanous timeout expiry and unpark()
4432 // we return OS_OK indicating we awoke via unpark().
4433 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4434 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4435 }
4436
4437 void os::PlatformEvent::park () {
4438 guarantee (_ParkHandle != NULL, "Invariant") ;
4439 // Invariant: Only the thread associated with the Event/PlatformEvent
4440 // may call park().
4441 int v ;
4442 for (;;) {
4443 v = _Event ;
4444 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4445 }
4446 guarantee ((v == 0) || (v == 1), "invariant") ;
4447 if (v != 0) return ;
4448
4449 // Do this the hard way by blocking ...
4450 // TODO: consider a brief spin here, gated on the success of recent
4451 // spin attempts by this thread.
4452 while (_Event < 0) {
4453 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4454 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4455 }
4456
4457 // Usually we'll find _Event == 0 at this point, but as
4458 // an optional optimization we clear it, just in case can
4459 // multiple unpark() operations drove _Event up to 1.
4460 _Event = 0 ;
4461 OrderAccess::fence() ;
4462 guarantee (_Event >= 0, "invariant") ;
4463 }
4464
4465 void os::PlatformEvent::unpark() {
4466 guarantee (_ParkHandle != NULL, "Invariant") ;
4467 int v ;
4468 for (;;) {
4469 v = _Event ; // Increment _Event if it's < 1.
4470 if (v > 0) {
4471 // If it's already signaled just return.
4472 // The LD of _Event could have reordered or be satisfied
4473 // by a read-aside from this processor's write buffer.
4474 // To avoid problems execute a barrier and then
4475 // ratify the value. A degenerate CAS() would also work.
4476 // Viz., CAS (v+0, &_Event, v) == v).
4477 OrderAccess::fence() ;
4478 if (_Event == v) return ;
4479 continue ;
4480 }
4481 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4482 }
4483 if (v < 0) {
4484 ::SetEvent (_ParkHandle) ;
4485 }
4486 }
4487
4488
4489 // JSR166
4490 // -------------------------------------------------------
4491
4492 /*
4493 * The Windows implementation of Park is very straightforward: Basic
4494 * operations on Win32 Events turn out to have the right semantics to
4495 * use them directly. We opportunistically resuse the event inherited
4496 * from Monitor.
4497 */
4498
4499
4500 void Parker::park(bool isAbsolute, jlong time) {
4501 guarantee (_ParkEvent != NULL, "invariant") ;
4502 // First, demultiplex/decode time arguments
4503 if (time < 0) { // don't wait
4504 return;
4505 }
4506 else if (time == 0 && !isAbsolute) {
4507 time = INFINITE;
4508 }
4509 else if (isAbsolute) {
4510 time -= os::javaTimeMillis(); // convert to relative time
4511 if (time <= 0) // already elapsed
4512 return;
4513 }
4514 else { // relative
4515 time /= 1000000; // Must coarsen from nanos to millis
4516 if (time == 0) // Wait for the minimal time unit if zero
4517 time = 1;
4518 }
4519
4520 JavaThread* thread = (JavaThread*)(Thread::current());
4521 assert(thread->is_Java_thread(), "Must be JavaThread");
4522 JavaThread *jt = (JavaThread *)thread;
4523
4524 // Don't wait if interrupted or already triggered
4525 if (Thread::is_interrupted(thread, false) ||
4526 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4527 ResetEvent(_ParkEvent);
4528 return;
4529 }
4530 else {
4531 ThreadBlockInVM tbivm(jt);
4532 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4533 jt->set_suspend_equivalent();
4534
4535 WaitForSingleObject(_ParkEvent, time);
4536 ResetEvent(_ParkEvent);
4537
4538 // If externally suspended while waiting, re-suspend
4539 if (jt->handle_special_suspend_equivalent_condition()) {
4540 jt->java_suspend_self();
4541 }
4542 }
4543 }
4544
4545 void Parker::unpark() {
4546 guarantee (_ParkEvent != NULL, "invariant") ;
4547 SetEvent(_ParkEvent);
4548 }
4549
4550 // Run the specified command in a separate process. Return its exit value,
4551 // or -1 on failure (e.g. can't create a new process).
4552 int os::fork_and_exec(char* cmd) {
4553 STARTUPINFO si;
4554 PROCESS_INFORMATION pi;
4555
4556 memset(&si, 0, sizeof(si));
4557 si.cb = sizeof(si);
4558 memset(&pi, 0, sizeof(pi));
4559 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4560 cmd, // command line
4561 NULL, // process security attribute
4562 NULL, // thread security attribute
4563 TRUE, // inherits system handles
4564 0, // no creation flags
4565 NULL, // use parent's environment block
4566 NULL, // use parent's starting directory
4567 &si, // (in) startup information
4568 &pi); // (out) process information
4569
4570 if (rslt) {
4571 // Wait until child process exits.
4572 WaitForSingleObject(pi.hProcess, INFINITE);
4573
4574 DWORD exit_code;
4575 GetExitCodeProcess(pi.hProcess, &exit_code);
4576
4577 // Close process and thread handles.
4578 CloseHandle(pi.hProcess);
4579 CloseHandle(pi.hThread);
4580
4581 return (int)exit_code;
4582 } else {
4583 return -1;
4584 }
4585 }
4586
4587 //--------------------------------------------------------------------------------------------------
4588 // Non-product code
4589
4590 static int mallocDebugIntervalCounter = 0;
4591 static int mallocDebugCounter = 0;
4592 bool os::check_heap(bool force) {
4593 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4594 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4595 // Note: HeapValidate executes two hardware breakpoints when it finds something
4596 // wrong; at these points, eax contains the address of the offending block (I think).
4597 // To get to the exlicit error message(s) below, just continue twice.
4598 HANDLE heap = GetProcessHeap();
4599 { HeapLock(heap);
4600 PROCESS_HEAP_ENTRY phe;
4601 phe.lpData = NULL;
4602 while (HeapWalk(heap, &phe) != 0) {
4603 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4604 !HeapValidate(heap, 0, phe.lpData)) {
4605 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4606 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4607 fatal("corrupted C heap");
4608 }
4609 }
4610 int err = GetLastError();
4611 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4612 fatal(err_msg("heap walk aborted with error %d", err));
4613 }
4614 HeapUnlock(heap);
4615 }
4616 mallocDebugIntervalCounter = 0;
4617 }
4618 return true;
4619 }
4620
4621
4622 bool os::find(address addr, outputStream* st) {
4623 // Nothing yet
4624 return false;
4625 }
4626
4627 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4628 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4629
4630 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4631 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4632 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4633 address addr = (address) exceptionRecord->ExceptionInformation[1];
4634
4635 if (os::is_memory_serialize_page(thread, addr))
4636 return EXCEPTION_CONTINUE_EXECUTION;
4637 }
4638
4639 return EXCEPTION_CONTINUE_SEARCH;
4640 }
4641
4642 static int getLastErrorString(char *buf, size_t len)
4643 {
4644 long errval;
4645
4646 if ((errval = GetLastError()) != 0)
4647 {
4648 /* DOS error */
4649 size_t n = (size_t)FormatMessage(
4650 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4651 NULL,
4652 errval,
4653 0,
4654 buf,
4655 (DWORD)len,
4656 NULL);
4657 if (n > 3) {
4658 /* Drop final '.', CR, LF */
4659 if (buf[n - 1] == '\n') n--;
4660 if (buf[n - 1] == '\r') n--;
4661 if (buf[n - 1] == '.') n--;
4662 buf[n] = '\0';
4663 }
4664 return (int)n;
4665 }
4666
4667 if (errno != 0)
4668 {
4669 /* C runtime error that has no corresponding DOS error code */
4670 const char *s = strerror(errno);
4671 size_t n = strlen(s);
4672 if (n >= len) n = len - 1;
4673 strncpy(buf, s, n);
4674 buf[n] = '\0';
4675 return (int)n;
4676 }
4677 return 0;
4678 }
4679
4680
4681 // We don't build a headless jre for Windows
4682 bool os::is_headless_jre() { return false; }
4683
4684 // OS_SocketInterface
4685 // Not used on Windows
4686
4687 // OS_SocketInterface
4688 typedef struct hostent * (PASCAL FAR *ws2_ifn_ptr_t)(...);
4689 ws2_ifn_ptr_t *get_host_by_name_fn = NULL;
4690
4691 typedef CRITICAL_SECTION mutex_t;
4692 #define mutexInit(m) InitializeCriticalSection(m)
4693 #define mutexDestroy(m) DeleteCriticalSection(m)
4694 #define mutexLock(m) EnterCriticalSection(m)
4695 #define mutexUnlock(m) LeaveCriticalSection(m)
4696
4697 static bool sockfnptrs_initialized = FALSE;
4698 static mutex_t sockFnTableMutex;
4699
4700 /* is Winsock2 loaded? better to be explicit than to rely on sockfnptrs */
4701 static bool winsock2Available = FALSE;
4702
4703
4704 static void initSockFnTable() {
4705 int (PASCAL FAR* WSAStartupPtr)(WORD, LPWSADATA);
4706 WSADATA wsadata;
4707
4708 ::mutexInit(&sockFnTableMutex);
4709 ::mutexLock(&sockFnTableMutex);
4710
4711 if (sockfnptrs_initialized == FALSE) {
4712 HMODULE hWinsock;
4713
4714 /* try to load Winsock2, and if that fails, load Winsock */
4715 hWinsock = ::LoadLibrary("ws2_32.dll");
4716
4717 if (hWinsock == NULL) {
4718 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n",
4719 ::GetLastError());
4720 return;
4721 }
4722
4723 /* If we loaded a DLL, then we might as well initialize it. */
4724 WSAStartupPtr = (int (PASCAL FAR *)(WORD, LPWSADATA))
4725 ::GetProcAddress(hWinsock, "WSAStartup");
4726
4727 if (WSAStartupPtr(MAKEWORD(1,1), &wsadata) != 0) {
4728 jio_fprintf(stderr, "Could not initialize Winsock\n");
4729 }
4730
4731 get_host_by_name_fn
4732 = (ws2_ifn_ptr_t*) GetProcAddress(hWinsock, "gethostbyname");
4733 }
4734
4735 assert(get_host_by_name_fn != NULL,
4736 "gethostbyname function not found");
4737 sockfnptrs_initialized = TRUE;
4738 ::mutexUnlock(&sockFnTableMutex);
4739 }
4740
4741 struct hostent* os::get_host_by_name(char* name) {
4742 if (!sockfnptrs_initialized) {
4743 initSockFnTable();
4744 }
4745
4746 assert(sockfnptrs_initialized == TRUE && get_host_by_name_fn != NULL,
4747 "sockfnptrs is not initialized or pointer to gethostbyname function is NULL");
4748 return (*get_host_by_name_fn)(name);
4749 }
4750
4751
4752 int os::socket_close(int fd) {
4753 ShouldNotReachHere();
4754 return 0;
4755 }
4756
4757 int os::socket_available(int fd, jint *pbytes) {
4758 ShouldNotReachHere();
4759 return 0;
4760 }
4761
4762 int os::socket(int domain, int type, int protocol) {
4763 ShouldNotReachHere();
4764 return 0;
4765 }
4766
4767 int os::listen(int fd, int count) {
4768 ShouldNotReachHere();
4769 return 0;
4770 }
4771
4772 int os::connect(int fd, struct sockaddr *him, int len) {
4773 ShouldNotReachHere();
4774 return 0;
4775 }
4776
4777 int os::accept(int fd, struct sockaddr *him, int *len) {
4778 ShouldNotReachHere();
4779 return 0;
4780 }
4781
4782 int os::sendto(int fd, char *buf, int len, int flags,
4783 struct sockaddr *to, int tolen) {
4784 ShouldNotReachHere();
4785 return 0;
4786 }
4787
4788 int os::recvfrom(int fd, char *buf, int nBytes, int flags,
4789 sockaddr *from, int *fromlen) {
4790 ShouldNotReachHere();
4791 return 0;
4792 }
4793
4794 int os::recv(int fd, char *buf, int nBytes, int flags) {
4795 ShouldNotReachHere();
4796 return 0;
4797 }
4798
4799 int os::send(int fd, char *buf, int nBytes, int flags) {
4800 ShouldNotReachHere();
4801 return 0;
4802 }
4803
4804 int os::raw_send(int fd, char *buf, int nBytes, int flags) {
4805 ShouldNotReachHere();
4806 return 0;
4807 }
4808
4809 int os::timeout(int fd, long timeout) {
4810 ShouldNotReachHere();
4811 return 0;
4812 }
4813
4814 int os::get_host_name(char* name, int namelen) {
4815 ShouldNotReachHere();
4816 return 0;
4817 }
4818
4819 int os::socket_shutdown(int fd, int howto) {
4820 ShouldNotReachHere();
4821 return 0;
4822 }
4823
4824 int os::bind(int fd, struct sockaddr *him, int len) {
4825 ShouldNotReachHere();
4826 return 0;
4827 }
4828
4829 int os::get_sock_name(int fd, struct sockaddr *him, int *len) {
4830 ShouldNotReachHere();
4831 return 0;
4832 }
4833
4834 int os::get_sock_opt(int fd, int level, int optname,
4835 char *optval, int* optlen) {
4836 ShouldNotReachHere();
4837 return 0;
4838 }
4839
4840 int os::set_sock_opt(int fd, int level, int optname,
4841 const char *optval, int optlen) {
4842 ShouldNotReachHere();
4843 return 0;
4844 }