1 /*
2 * Copyright (c) 1997, 2012, 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 // Must be at least Windows 2000 or XP to use VectoredExceptions and IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "jvm_windows.h"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "mutex_windows.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "os_share_windows.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/threadCritical.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/attachListener.hpp"
61 #include "services/runtimeService.hpp"
62 #include "thread_windows.inline.hpp"
63 #include "utilities/decoder.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/growableArray.hpp"
67 #include "utilities/vmError.hpp"
68 #ifdef TARGET_ARCH_x86
69 # include "assembler_x86.inline.hpp"
70 # include "nativeInst_x86.hpp"
71 #endif
72 #ifdef COMPILER1
73 #include "c1/c1_Runtime1.hpp"
74 #endif
75 #ifdef COMPILER2
76 #include "opto/runtime.hpp"
77 #endif
78
79 #ifdef _DEBUG
80 #include <crtdbg.h>
81 #endif
82
83
84 #include <windows.h>
85 #include <sys/types.h>
86 #include <sys/stat.h>
87 #include <sys/timeb.h>
88 #include <objidl.h>
89 #include <shlobj.h>
90
91 #include <malloc.h>
92 #include <signal.h>
93 #include <direct.h>
94 #include <errno.h>
95 #include <fcntl.h>
96 #include <io.h>
97 #include <process.h> // For _beginthreadex(), _endthreadex()
98 #include <imagehlp.h> // For os::dll_address_to_function_name
99 /* for enumerating dll libraries */
100 #include <vdmdbg.h>
101
102 // for timer info max values which include all bits
103 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
104
105 // For DLL loading/load error detection
106 // Values of PE COFF
107 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
108 #define IMAGE_FILE_SIGNATURE_LENGTH 4
109
110 static HANDLE main_process;
111 static HANDLE main_thread;
112 static int main_thread_id;
113
114 static FILETIME process_creation_time;
115 static FILETIME process_exit_time;
116 static FILETIME process_user_time;
117 static FILETIME process_kernel_time;
118
119 #ifdef _WIN64
120 PVOID topLevelVectoredExceptionHandler = NULL;
121 #endif
122
123 #ifdef _M_IA64
124 #define __CPU__ ia64
125 #elif _M_AMD64
126 #define __CPU__ amd64
127 #else
128 #define __CPU__ i486
129 #endif
130
131 // save DLL module handle, used by GetModuleFileName
132
133 HINSTANCE vm_lib_handle;
134
135 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
136 switch (reason) {
137 case DLL_PROCESS_ATTACH:
138 vm_lib_handle = hinst;
139 if(ForceTimeHighResolution)
140 timeBeginPeriod(1L);
141 break;
142 case DLL_PROCESS_DETACH:
143 if(ForceTimeHighResolution)
144 timeEndPeriod(1L);
145 #ifdef _WIN64
146 if (topLevelVectoredExceptionHandler != NULL) {
147 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
148 topLevelVectoredExceptionHandler = NULL;
149 }
150 #endif
151 break;
152 default:
153 break;
154 }
155 return true;
156 }
157
158 static inline double fileTimeAsDouble(FILETIME* time) {
159 const double high = (double) ((unsigned int) ~0);
160 const double split = 10000000.0;
161 double result = (time->dwLowDateTime / split) +
162 time->dwHighDateTime * (high/split);
163 return result;
164 }
165
166 // Implementation of os
167
168 bool os::getenv(const char* name, char* buffer, int len) {
169 int result = GetEnvironmentVariable(name, buffer, len);
170 return result > 0 && result < len;
171 }
172
173
174 // No setuid programs under Windows.
175 bool os::have_special_privileges() {
176 return false;
177 }
178
179
180 // This method is a periodic task to check for misbehaving JNI applications
181 // under CheckJNI, we can add any periodic checks here.
182 // For Windows at the moment does nothing
183 void os::run_periodic_checks() {
184 return;
185 }
186
187 #ifndef _WIN64
188 // previous UnhandledExceptionFilter, if there is one
189 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
190
191 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
192 #endif
193 void os::init_system_properties_values() {
194 /* sysclasspath, java_home, dll_dir */
195 {
196 char *home_path;
197 char *dll_path;
198 char *pslash;
199 char *bin = "\\bin";
200 char home_dir[MAX_PATH];
201
202 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
203 os::jvm_path(home_dir, sizeof(home_dir));
204 // Found the full path to jvm[_g].dll.
205 // Now cut the path to <java_home>/jre if we can.
206 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
207 pslash = strrchr(home_dir, '\\');
208 if (pslash != NULL) {
209 *pslash = '\0'; /* get rid of \{client|server} */
210 pslash = strrchr(home_dir, '\\');
211 if (pslash != NULL)
212 *pslash = '\0'; /* get rid of \bin */
213 }
214 }
215
216 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
217 if (home_path == NULL)
218 return;
219 strcpy(home_path, home_dir);
220 Arguments::set_java_home(home_path);
221
222 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
223 if (dll_path == NULL)
224 return;
225 strcpy(dll_path, home_dir);
226 strcat(dll_path, bin);
227 Arguments::set_dll_dir(dll_path);
228
229 if (!set_boot_path('\\', ';'))
230 return;
231 }
232
233 /* library_path */
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 /* Win32 library search order (See the documentation for LoadLibrary):
239 *
240 * 1. The directory from which application is loaded.
241 * 2. The system wide Java Extensions directory (Java only)
242 * 3. System directory (GetSystemDirectory)
243 * 4. Windows directory (GetWindowsDirectory)
244 * 5. The PATH environment variable
245 * 6. The current directory
246 */
247
248 char *library_path;
249 char tmp[MAX_PATH];
250 char *path_str = ::getenv("PATH");
251
252 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
253 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
254
255 library_path[0] = '\0';
256
257 GetModuleFileName(NULL, tmp, sizeof(tmp));
258 *(strrchr(tmp, '\\')) = '\0';
259 strcat(library_path, tmp);
260
261 GetWindowsDirectory(tmp, sizeof(tmp));
262 strcat(library_path, ";");
263 strcat(library_path, tmp);
264 strcat(library_path, PACKAGE_DIR BIN_DIR);
265
266 GetSystemDirectory(tmp, sizeof(tmp));
267 strcat(library_path, ";");
268 strcat(library_path, tmp);
269
270 GetWindowsDirectory(tmp, sizeof(tmp));
271 strcat(library_path, ";");
272 strcat(library_path, tmp);
273
274 if (path_str) {
275 strcat(library_path, ";");
276 strcat(library_path, path_str);
277 }
278
279 strcat(library_path, ";.");
280
281 Arguments::set_library_path(library_path);
282 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
283 }
284
285 /* Default extensions directory */
286 {
287 char path[MAX_PATH];
288 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
289 GetWindowsDirectory(path, MAX_PATH);
290 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
291 path, PACKAGE_DIR, EXT_DIR);
292 Arguments::set_ext_dirs(buf);
293 }
294 #undef EXT_DIR
295 #undef BIN_DIR
296 #undef PACKAGE_DIR
297
298 /* Default endorsed standards directory. */
299 {
300 #define ENDORSED_DIR "\\lib\\endorsed"
301 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
302 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
303 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
304 Arguments::set_endorsed_dirs(buf);
305 #undef ENDORSED_DIR
306 }
307
308 #ifndef _WIN64
309 // set our UnhandledExceptionFilter and save any previous one
310 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
311 #endif
312
313 // Done
314 return;
315 }
316
317 void os::breakpoint() {
318 DebugBreak();
319 }
320
321 // Invoked from the BREAKPOINT Macro
322 extern "C" void breakpoint() {
323 os::breakpoint();
324 }
325
326 /*
327 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
328 * So far, this method is only used by Native Memory Tracking, which is
329 * only supported on Windows XP or later.
330 */
331 address os::get_caller_pc(int n) {
332 #ifdef _NMT_NOINLINE_
333 n ++;
334 #endif
335 address pc;
336 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
337 return pc;
338 }
339 return NULL;
340 }
341
342
343 // os::current_stack_base()
344 //
345 // Returns the base of the stack, which is the stack's
346 // starting address. This function must be called
347 // while running on the stack of the thread being queried.
348
349 address os::current_stack_base() {
350 MEMORY_BASIC_INFORMATION minfo;
351 address stack_bottom;
352 size_t stack_size;
353
354 VirtualQuery(&minfo, &minfo, sizeof(minfo));
355 stack_bottom = (address)minfo.AllocationBase;
356 stack_size = minfo.RegionSize;
357
358 // Add up the sizes of all the regions with the same
359 // AllocationBase.
360 while( 1 )
361 {
362 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
363 if ( stack_bottom == (address)minfo.AllocationBase )
364 stack_size += minfo.RegionSize;
365 else
366 break;
367 }
368
369 #ifdef _M_IA64
370 // IA64 has memory and register stacks
371 stack_size = stack_size / 2;
372 #endif
373 return stack_bottom + stack_size;
374 }
375
376 size_t os::current_stack_size() {
377 size_t sz;
378 MEMORY_BASIC_INFORMATION minfo;
379 VirtualQuery(&minfo, &minfo, sizeof(minfo));
380 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
381 return sz;
382 }
383
384 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
385 const struct tm* time_struct_ptr = localtime(clock);
386 if (time_struct_ptr != NULL) {
387 *res = *time_struct_ptr;
388 return res;
389 }
390 return NULL;
391 }
392
393 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
394
395 // Thread start routine for all new Java threads
396 static unsigned __stdcall java_start(Thread* thread) {
397 // Try to randomize the cache line index of hot stack frames.
398 // This helps when threads of the same stack traces evict each other's
399 // cache lines. The threads can be either from the same JVM instance, or
400 // from different JVM instances. The benefit is especially true for
401 // processors with hyperthreading technology.
402 static int counter = 0;
403 int pid = os::current_process_id();
404 _alloca(((pid ^ counter++) & 7) * 128);
405
406 OSThread* osthr = thread->osthread();
407 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
408
409 if (UseNUMA) {
410 int lgrp_id = os::numa_get_group_id();
411 if (lgrp_id != -1) {
412 thread->set_lgrp_id(lgrp_id);
413 }
414 }
415
416
417 if (UseVectoredExceptions) {
418 // If we are using vectored exception we don't need to set a SEH
419 thread->run();
420 }
421 else {
422 // Install a win32 structured exception handler around every thread created
423 // by VM, so VM can genrate error dump when an exception occurred in non-
424 // Java thread (e.g. VM thread).
425 __try {
426 thread->run();
427 } __except(topLevelExceptionFilter(
428 (_EXCEPTION_POINTERS*)_exception_info())) {
429 // Nothing to do.
430 }
431 }
432
433 // One less thread is executing
434 // When the VMThread gets here, the main thread may have already exited
435 // which frees the CodeHeap containing the Atomic::add code
436 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
437 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
438 }
439
440 return 0;
441 }
442
443 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
444 // Allocate the OSThread object
445 OSThread* osthread = new OSThread(NULL, NULL);
446 if (osthread == NULL) return NULL;
447
448 // Initialize support for Java interrupts
449 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
450 if (interrupt_event == NULL) {
451 delete osthread;
452 return NULL;
453 }
454 osthread->set_interrupt_event(interrupt_event);
455
456 // Store info on the Win32 thread into the OSThread
457 osthread->set_thread_handle(thread_handle);
458 osthread->set_thread_id(thread_id);
459
460 if (UseNUMA) {
461 int lgrp_id = os::numa_get_group_id();
462 if (lgrp_id != -1) {
463 thread->set_lgrp_id(lgrp_id);
464 }
465 }
466
467 // Initial thread state is INITIALIZED, not SUSPENDED
468 osthread->set_state(INITIALIZED);
469
470 return osthread;
471 }
472
473
474 bool os::create_attached_thread(JavaThread* thread) {
475 #ifdef ASSERT
476 thread->verify_not_published();
477 #endif
478 HANDLE thread_h;
479 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
480 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
481 fatal("DuplicateHandle failed\n");
482 }
483 OSThread* osthread = create_os_thread(thread, thread_h,
484 (int)current_thread_id());
485 if (osthread == NULL) {
486 return false;
487 }
488
489 // Initial thread state is RUNNABLE
490 osthread->set_state(RUNNABLE);
491
492 thread->set_osthread(osthread);
493 return true;
494 }
495
496 bool os::create_main_thread(JavaThread* thread) {
497 #ifdef ASSERT
498 thread->verify_not_published();
499 #endif
500 if (_starting_thread == NULL) {
501 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
502 if (_starting_thread == NULL) {
503 return false;
504 }
505 }
506
507 // The primordial thread is runnable from the start)
508 _starting_thread->set_state(RUNNABLE);
509
510 thread->set_osthread(_starting_thread);
511 return true;
512 }
513
514 // Allocate and initialize a new OSThread
515 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
516 unsigned thread_id;
517
518 // Allocate the OSThread object
519 OSThread* osthread = new OSThread(NULL, NULL);
520 if (osthread == NULL) {
521 return false;
522 }
523
524 // Initialize support for Java interrupts
525 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
526 if (interrupt_event == NULL) {
527 delete osthread;
528 return NULL;
529 }
530 osthread->set_interrupt_event(interrupt_event);
531 osthread->set_interrupted(false);
532
533 thread->set_osthread(osthread);
534
535 if (stack_size == 0) {
536 switch (thr_type) {
537 case os::java_thread:
538 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
539 if (JavaThread::stack_size_at_create() > 0)
540 stack_size = JavaThread::stack_size_at_create();
541 break;
542 case os::compiler_thread:
543 if (CompilerThreadStackSize > 0) {
544 stack_size = (size_t)(CompilerThreadStackSize * K);
545 break;
546 } // else fall through:
547 // use VMThreadStackSize if CompilerThreadStackSize is not defined
548 case os::vm_thread:
549 case os::pgc_thread:
550 case os::cgc_thread:
551 case os::watcher_thread:
552 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
553 break;
554 }
555 }
556
557 // Create the Win32 thread
558 //
559 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
560 // does not specify stack size. Instead, it specifies the size of
561 // initially committed space. The stack size is determined by
562 // PE header in the executable. If the committed "stack_size" is larger
563 // than default value in the PE header, the stack is rounded up to the
564 // nearest multiple of 1MB. For example if the launcher has default
565 // stack size of 320k, specifying any size less than 320k does not
566 // affect the actual stack size at all, it only affects the initial
567 // commitment. On the other hand, specifying 'stack_size' larger than
568 // default value may cause significant increase in memory usage, because
569 // not only the stack space will be rounded up to MB, but also the
570 // entire space is committed upfront.
571 //
572 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
573 // for CreateThread() that can treat 'stack_size' as stack size. However we
574 // are not supposed to call CreateThread() directly according to MSDN
575 // document because JVM uses C runtime library. The good news is that the
576 // flag appears to work with _beginthredex() as well.
577
578 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
579 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
580 #endif
581
582 HANDLE thread_handle =
583 (HANDLE)_beginthreadex(NULL,
584 (unsigned)stack_size,
585 (unsigned (__stdcall *)(void*)) java_start,
586 thread,
587 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
588 &thread_id);
589 if (thread_handle == NULL) {
590 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
591 // without the flag.
592 thread_handle =
593 (HANDLE)_beginthreadex(NULL,
594 (unsigned)stack_size,
595 (unsigned (__stdcall *)(void*)) java_start,
596 thread,
597 CREATE_SUSPENDED,
598 &thread_id);
599 }
600 if (thread_handle == NULL) {
601 // Need to clean up stuff we've allocated so far
602 CloseHandle(osthread->interrupt_event());
603 thread->set_osthread(NULL);
604 delete osthread;
605 return NULL;
606 }
607
608 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
609
610 // Store info on the Win32 thread into the OSThread
611 osthread->set_thread_handle(thread_handle);
612 osthread->set_thread_id(thread_id);
613
614 // Initial thread state is INITIALIZED, not SUSPENDED
615 osthread->set_state(INITIALIZED);
616
617 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
618 return true;
619 }
620
621
622 // Free Win32 resources related to the OSThread
623 void os::free_thread(OSThread* osthread) {
624 assert(osthread != NULL, "osthread not set");
625 CloseHandle(osthread->thread_handle());
626 CloseHandle(osthread->interrupt_event());
627 delete osthread;
628 }
629
630
631 static int has_performance_count = 0;
632 static jlong first_filetime;
633 static jlong initial_performance_count;
634 static jlong performance_frequency;
635
636
637 jlong as_long(LARGE_INTEGER x) {
638 jlong result = 0; // initialization to avoid warning
639 set_high(&result, x.HighPart);
640 set_low(&result, x.LowPart);
641 return result;
642 }
643
644
645 jlong os::elapsed_counter() {
646 LARGE_INTEGER count;
647 if (has_performance_count) {
648 QueryPerformanceCounter(&count);
649 return as_long(count) - initial_performance_count;
650 } else {
651 FILETIME wt;
652 GetSystemTimeAsFileTime(&wt);
653 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
654 }
655 }
656
657
658 jlong os::elapsed_frequency() {
659 if (has_performance_count) {
660 return performance_frequency;
661 } else {
662 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
663 return 10000000;
664 }
665 }
666
667
668 julong os::available_memory() {
669 return win32::available_memory();
670 }
671
672 julong os::win32::available_memory() {
673 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
674 // value if total memory is larger than 4GB
675 MEMORYSTATUSEX ms;
676 ms.dwLength = sizeof(ms);
677 GlobalMemoryStatusEx(&ms);
678
679 return (julong)ms.ullAvailPhys;
680 }
681
682 julong os::physical_memory() {
683 return win32::physical_memory();
684 }
685
686 julong os::allocatable_physical_memory(julong size) {
687 #ifdef _LP64
688 return size;
689 #else
690 // Limit to 1400m because of the 2gb address space wall
691 return MIN2(size, (julong)1400*M);
692 #endif
693 }
694
695 // VC6 lacks DWORD_PTR
696 #if _MSC_VER < 1300
697 typedef UINT_PTR DWORD_PTR;
698 #endif
699
700 int os::active_processor_count() {
701 DWORD_PTR lpProcessAffinityMask = 0;
702 DWORD_PTR lpSystemAffinityMask = 0;
703 int proc_count = processor_count();
704 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
705 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
706 // Nof active processors is number of bits in process affinity mask
707 int bitcount = 0;
708 while (lpProcessAffinityMask != 0) {
709 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
710 bitcount++;
711 }
712 return bitcount;
713 } else {
714 return proc_count;
715 }
716 }
717
718 void os::set_native_thread_name(const char *name) {
719 // Not yet implemented.
720 return;
721 }
722
723 bool os::distribute_processes(uint length, uint* distribution) {
724 // Not yet implemented.
725 return false;
726 }
727
728 bool os::bind_to_processor(uint processor_id) {
729 // Not yet implemented.
730 return false;
731 }
732
733 static void initialize_performance_counter() {
734 LARGE_INTEGER count;
735 if (QueryPerformanceFrequency(&count)) {
736 has_performance_count = 1;
737 performance_frequency = as_long(count);
738 QueryPerformanceCounter(&count);
739 initial_performance_count = as_long(count);
740 } else {
741 has_performance_count = 0;
742 FILETIME wt;
743 GetSystemTimeAsFileTime(&wt);
744 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
745 }
746 }
747
748
749 double os::elapsedTime() {
750 return (double) elapsed_counter() / (double) elapsed_frequency();
751 }
752
753
754 // Windows format:
755 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
756 // Java format:
757 // Java standards require the number of milliseconds since 1/1/1970
758
759 // Constant offset - calculated using offset()
760 static jlong _offset = 116444736000000000;
761 // Fake time counter for reproducible results when debugging
762 static jlong fake_time = 0;
763
764 #ifdef ASSERT
765 // Just to be safe, recalculate the offset in debug mode
766 static jlong _calculated_offset = 0;
767 static int _has_calculated_offset = 0;
768
769 jlong offset() {
770 if (_has_calculated_offset) return _calculated_offset;
771 SYSTEMTIME java_origin;
772 java_origin.wYear = 1970;
773 java_origin.wMonth = 1;
774 java_origin.wDayOfWeek = 0; // ignored
775 java_origin.wDay = 1;
776 java_origin.wHour = 0;
777 java_origin.wMinute = 0;
778 java_origin.wSecond = 0;
779 java_origin.wMilliseconds = 0;
780 FILETIME jot;
781 if (!SystemTimeToFileTime(&java_origin, &jot)) {
782 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
783 }
784 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
785 _has_calculated_offset = 1;
786 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
787 return _calculated_offset;
788 }
789 #else
790 jlong offset() {
791 return _offset;
792 }
793 #endif
794
795 jlong windows_to_java_time(FILETIME wt) {
796 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
797 return (a - offset()) / 10000;
798 }
799
800 FILETIME java_to_windows_time(jlong l) {
801 jlong a = (l * 10000) + offset();
802 FILETIME result;
803 result.dwHighDateTime = high(a);
804 result.dwLowDateTime = low(a);
805 return result;
806 }
807
808 // For now, we say that Windows does not support vtime. I have no idea
809 // whether it can actually be made to (DLD, 9/13/05).
810
811 bool os::supports_vtime() { return false; }
812 bool os::enable_vtime() { return false; }
813 bool os::vtime_enabled() { return false; }
814 double os::elapsedVTime() {
815 // better than nothing, but not much
816 return elapsedTime();
817 }
818
819 jlong os::javaTimeMillis() {
820 if (UseFakeTimers) {
821 return fake_time++;
822 } else {
823 FILETIME wt;
824 GetSystemTimeAsFileTime(&wt);
825 return windows_to_java_time(wt);
826 }
827 }
828
829 jlong os::javaTimeNanos() {
830 if (!has_performance_count) {
831 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
832 } else {
833 LARGE_INTEGER current_count;
834 QueryPerformanceCounter(¤t_count);
835 double current = as_long(current_count);
836 double freq = performance_frequency;
837 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
838 return time;
839 }
840 }
841
842 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
843 if (!has_performance_count) {
844 // javaTimeMillis() doesn't have much percision,
845 // but it is not going to wrap -- so all 64 bits
846 info_ptr->max_value = ALL_64_BITS;
847
848 // this is a wall clock timer, so may skip
849 info_ptr->may_skip_backward = true;
850 info_ptr->may_skip_forward = true;
851 } else {
852 jlong freq = performance_frequency;
853 if (freq < NANOSECS_PER_SEC) {
854 // the performance counter is 64 bits and we will
855 // be multiplying it -- so no wrap in 64 bits
856 info_ptr->max_value = ALL_64_BITS;
857 } else if (freq > NANOSECS_PER_SEC) {
858 // use the max value the counter can reach to
859 // determine the max value which could be returned
860 julong max_counter = (julong)ALL_64_BITS;
861 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
862 } else {
863 // the performance counter is 64 bits and we will
864 // be using it directly -- so no wrap in 64 bits
865 info_ptr->max_value = ALL_64_BITS;
866 }
867
868 // using a counter, so no skipping
869 info_ptr->may_skip_backward = false;
870 info_ptr->may_skip_forward = false;
871 }
872 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
873 }
874
875 char* os::local_time_string(char *buf, size_t buflen) {
876 SYSTEMTIME st;
877 GetLocalTime(&st);
878 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
879 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
880 return buf;
881 }
882
883 bool os::getTimesSecs(double* process_real_time,
884 double* process_user_time,
885 double* process_system_time) {
886 HANDLE h_process = GetCurrentProcess();
887 FILETIME create_time, exit_time, kernel_time, user_time;
888 BOOL result = GetProcessTimes(h_process,
889 &create_time,
890 &exit_time,
891 &kernel_time,
892 &user_time);
893 if (result != 0) {
894 FILETIME wt;
895 GetSystemTimeAsFileTime(&wt);
896 jlong rtc_millis = windows_to_java_time(wt);
897 jlong user_millis = windows_to_java_time(user_time);
898 jlong system_millis = windows_to_java_time(kernel_time);
899 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
900 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
901 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
902 return true;
903 } else {
904 return false;
905 }
906 }
907
908 void os::shutdown() {
909
910 // allow PerfMemory to attempt cleanup of any persistent resources
911 perfMemory_exit();
912
913 // flush buffered output, finish log files
914 ostream_abort();
915
916 // Check for abort hook
917 abort_hook_t abort_hook = Arguments::abort_hook();
918 if (abort_hook != NULL) {
919 abort_hook();
920 }
921 }
922
923
924 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
925 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
926
927 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
928 HINSTANCE dbghelp;
929 EXCEPTION_POINTERS ep;
930 MINIDUMP_EXCEPTION_INFORMATION mei;
931 MINIDUMP_EXCEPTION_INFORMATION* pmei;
932
933 HANDLE hProcess = GetCurrentProcess();
934 DWORD processId = GetCurrentProcessId();
935 HANDLE dumpFile;
936 MINIDUMP_TYPE dumpType;
937 static const char* cwd;
938
939 // If running on a client version of Windows and user has not explicitly enabled dumping
940 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
941 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
942 return;
943 // If running on a server version of Windows and user has explictly disabled dumping
944 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
945 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
946 return;
947 }
948
949 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
950
951 if (dbghelp == NULL) {
952 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
953 return;
954 }
955
956 _MiniDumpWriteDump = CAST_TO_FN_PTR(
957 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
958 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
959 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
960
961 if (_MiniDumpWriteDump == NULL) {
962 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
963 return;
964 }
965
966 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
967
968 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
969 // API_VERSION_NUMBER 11 or higher contains the ones we want though
970 #if API_VERSION_NUMBER >= 11
971 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
972 MiniDumpWithUnloadedModules);
973 #endif
974
975 cwd = get_current_directory(NULL, 0);
976 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
977 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
978
979 if (dumpFile == INVALID_HANDLE_VALUE) {
980 VMError::report_coredump_status("Failed to create file for dumping", false);
981 return;
982 }
983 if (exceptionRecord != NULL && contextRecord != NULL) {
984 ep.ContextRecord = (PCONTEXT) contextRecord;
985 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
986
987 mei.ThreadId = GetCurrentThreadId();
988 mei.ExceptionPointers = &ep;
989 pmei = &mei;
990 } else {
991 pmei = NULL;
992 }
993
994
995 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
996 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
997 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
998 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
999 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
1000 } else {
1001 VMError::report_coredump_status(buffer, true);
1002 }
1003
1004 CloseHandle(dumpFile);
1005 }
1006
1007
1008
1009 void os::abort(bool dump_core)
1010 {
1011 os::shutdown();
1012 // no core dump on Windows
1013 ::exit(1);
1014 }
1015
1016 // Die immediately, no exit hook, no abort hook, no cleanup.
1017 void os::die() {
1018 _exit(-1);
1019 }
1020
1021 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1022 // * dirent_md.c 1.15 00/02/02
1023 //
1024 // The declarations for DIR and struct dirent are in jvm_win32.h.
1025
1026 /* Caller must have already run dirname through JVM_NativePath, which removes
1027 duplicate slashes and converts all instances of '/' into '\\'. */
1028
1029 DIR *
1030 os::opendir(const char *dirname)
1031 {
1032 assert(dirname != NULL, "just checking"); // hotspot change
1033 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1034 DWORD fattr; // hotspot change
1035 char alt_dirname[4] = { 0, 0, 0, 0 };
1036
1037 if (dirp == 0) {
1038 errno = ENOMEM;
1039 return 0;
1040 }
1041
1042 /*
1043 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1044 * as a directory in FindFirstFile(). We detect this case here and
1045 * prepend the current drive name.
1046 */
1047 if (dirname[1] == '\0' && dirname[0] == '\\') {
1048 alt_dirname[0] = _getdrive() + 'A' - 1;
1049 alt_dirname[1] = ':';
1050 alt_dirname[2] = '\\';
1051 alt_dirname[3] = '\0';
1052 dirname = alt_dirname;
1053 }
1054
1055 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1056 if (dirp->path == 0) {
1057 free(dirp, mtInternal);
1058 errno = ENOMEM;
1059 return 0;
1060 }
1061 strcpy(dirp->path, dirname);
1062
1063 fattr = GetFileAttributes(dirp->path);
1064 if (fattr == 0xffffffff) {
1065 free(dirp->path, mtInternal);
1066 free(dirp, mtInternal);
1067 errno = ENOENT;
1068 return 0;
1069 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1070 free(dirp->path, mtInternal);
1071 free(dirp, mtInternal);
1072 errno = ENOTDIR;
1073 return 0;
1074 }
1075
1076 /* Append "*.*", or possibly "\\*.*", to path */
1077 if (dirp->path[1] == ':'
1078 && (dirp->path[2] == '\0'
1079 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1080 /* No '\\' needed for cases like "Z:" or "Z:\" */
1081 strcat(dirp->path, "*.*");
1082 } else {
1083 strcat(dirp->path, "\\*.*");
1084 }
1085
1086 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1087 if (dirp->handle == INVALID_HANDLE_VALUE) {
1088 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1089 free(dirp->path, mtInternal);
1090 free(dirp, mtInternal);
1091 errno = EACCES;
1092 return 0;
1093 }
1094 }
1095 return dirp;
1096 }
1097
1098 /* parameter dbuf unused on Windows */
1099
1100 struct dirent *
1101 os::readdir(DIR *dirp, dirent *dbuf)
1102 {
1103 assert(dirp != NULL, "just checking"); // hotspot change
1104 if (dirp->handle == INVALID_HANDLE_VALUE) {
1105 return 0;
1106 }
1107
1108 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1109
1110 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1111 if (GetLastError() == ERROR_INVALID_HANDLE) {
1112 errno = EBADF;
1113 return 0;
1114 }
1115 FindClose(dirp->handle);
1116 dirp->handle = INVALID_HANDLE_VALUE;
1117 }
1118
1119 return &dirp->dirent;
1120 }
1121
1122 int
1123 os::closedir(DIR *dirp)
1124 {
1125 assert(dirp != NULL, "just checking"); // hotspot change
1126 if (dirp->handle != INVALID_HANDLE_VALUE) {
1127 if (!FindClose(dirp->handle)) {
1128 errno = EBADF;
1129 return -1;
1130 }
1131 dirp->handle = INVALID_HANDLE_VALUE;
1132 }
1133 free(dirp->path, mtInternal);
1134 free(dirp, mtInternal);
1135 return 0;
1136 }
1137
1138 // This must be hard coded because it's the system's temporary
1139 // directory not the java application's temp directory, ala java.io.tmpdir.
1140 const char* os::get_temp_directory() {
1141 static char path_buf[MAX_PATH];
1142 if (GetTempPath(MAX_PATH, path_buf)>0)
1143 return path_buf;
1144 else{
1145 path_buf[0]='\0';
1146 return path_buf;
1147 }
1148 }
1149
1150 static bool file_exists(const char* filename) {
1151 if (filename == NULL || strlen(filename) == 0) {
1152 return false;
1153 }
1154 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1155 }
1156
1157 void os::dll_build_name(char *buffer, size_t buflen,
1158 const char* pname, const char* fname) {
1159 const size_t pnamelen = pname ? strlen(pname) : 0;
1160 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1161
1162 // Quietly truncates on buffer overflow. Should be an error.
1163 if (pnamelen + strlen(fname) + 10 > buflen) {
1164 *buffer = '\0';
1165 return;
1166 }
1167
1168 if (pnamelen == 0) {
1169 jio_snprintf(buffer, buflen, "%s.dll", fname);
1170 } else if (c == ':' || c == '\\') {
1171 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1172 } else if (strchr(pname, *os::path_separator()) != NULL) {
1173 int n;
1174 char** pelements = split_path(pname, &n);
1175 for (int i = 0 ; i < n ; i++) {
1176 char* path = pelements[i];
1177 // Really shouldn't be NULL, but check can't hurt
1178 size_t plen = (path == NULL) ? 0 : strlen(path);
1179 if (plen == 0) {
1180 continue; // skip the empty path values
1181 }
1182 const char lastchar = path[plen - 1];
1183 if (lastchar == ':' || lastchar == '\\') {
1184 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1185 } else {
1186 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1187 }
1188 if (file_exists(buffer)) {
1189 break;
1190 }
1191 }
1192 // release the storage
1193 for (int i = 0 ; i < n ; i++) {
1194 if (pelements[i] != NULL) {
1195 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1196 }
1197 }
1198 if (pelements != NULL) {
1199 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1200 }
1201 } else {
1202 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1203 }
1204 }
1205
1206 // Needs to be in os specific directory because windows requires another
1207 // header file <direct.h>
1208 const char* os::get_current_directory(char *buf, int buflen) {
1209 return _getcwd(buf, buflen);
1210 }
1211
1212 //-----------------------------------------------------------
1213 // Helper functions for fatal error handler
1214 #ifdef _WIN64
1215 // Helper routine which returns true if address in
1216 // within the NTDLL address space.
1217 //
1218 static bool _addr_in_ntdll( address addr )
1219 {
1220 HMODULE hmod;
1221 MODULEINFO minfo;
1222
1223 hmod = GetModuleHandle("NTDLL.DLL");
1224 if ( hmod == NULL ) return false;
1225 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1226 &minfo, sizeof(MODULEINFO)) )
1227 return false;
1228
1229 if ( (addr >= minfo.lpBaseOfDll) &&
1230 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1231 return true;
1232 else
1233 return false;
1234 }
1235 #endif
1236
1237
1238 // Enumerate all modules for a given process ID
1239 //
1240 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1241 // different API for doing this. We use PSAPI.DLL on NT based
1242 // Windows and ToolHelp on 95/98/Me.
1243
1244 // Callback function that is called by enumerate_modules() on
1245 // every DLL module.
1246 // Input parameters:
1247 // int pid,
1248 // char* module_file_name,
1249 // address module_base_addr,
1250 // unsigned module_size,
1251 // void* param
1252 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1253
1254 // enumerate_modules for Windows NT, using PSAPI
1255 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1256 {
1257 HANDLE hProcess ;
1258
1259 # define MAX_NUM_MODULES 128
1260 HMODULE modules[MAX_NUM_MODULES];
1261 static char filename[ MAX_PATH ];
1262 int result = 0;
1263
1264 if (!os::PSApiDll::PSApiAvailable()) {
1265 return 0;
1266 }
1267
1268 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1269 FALSE, pid ) ;
1270 if (hProcess == NULL) return 0;
1271
1272 DWORD size_needed;
1273 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1274 sizeof(modules), &size_needed)) {
1275 CloseHandle( hProcess );
1276 return 0;
1277 }
1278
1279 // number of modules that are currently loaded
1280 int num_modules = size_needed / sizeof(HMODULE);
1281
1282 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1283 // Get Full pathname:
1284 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1285 filename, sizeof(filename))) {
1286 filename[0] = '\0';
1287 }
1288
1289 MODULEINFO modinfo;
1290 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1291 &modinfo, sizeof(modinfo))) {
1292 modinfo.lpBaseOfDll = NULL;
1293 modinfo.SizeOfImage = 0;
1294 }
1295
1296 // Invoke callback function
1297 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1298 modinfo.SizeOfImage, param);
1299 if (result) break;
1300 }
1301
1302 CloseHandle( hProcess ) ;
1303 return result;
1304 }
1305
1306
1307 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1308 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1309 {
1310 HANDLE hSnapShot ;
1311 static MODULEENTRY32 modentry ;
1312 int result = 0;
1313
1314 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1315 return 0;
1316 }
1317
1318 // Get a handle to a Toolhelp snapshot of the system
1319 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1320 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1321 return FALSE ;
1322 }
1323
1324 // iterate through all modules
1325 modentry.dwSize = sizeof(MODULEENTRY32) ;
1326 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1327
1328 while( not_done ) {
1329 // invoke the callback
1330 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1331 modentry.modBaseSize, param);
1332 if (result) break;
1333
1334 modentry.dwSize = sizeof(MODULEENTRY32) ;
1335 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1336 }
1337
1338 CloseHandle(hSnapShot);
1339 return result;
1340 }
1341
1342 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1343 {
1344 // Get current process ID if caller doesn't provide it.
1345 if (!pid) pid = os::current_process_id();
1346
1347 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1348 else return _enumerate_modules_windows(pid, func, param);
1349 }
1350
1351 struct _modinfo {
1352 address addr;
1353 char* full_path; // point to a char buffer
1354 int buflen; // size of the buffer
1355 address base_addr;
1356 };
1357
1358 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1359 unsigned size, void * param) {
1360 struct _modinfo *pmod = (struct _modinfo *)param;
1361 if (!pmod) return -1;
1362
1363 if (base_addr <= pmod->addr &&
1364 base_addr+size > pmod->addr) {
1365 // if a buffer is provided, copy path name to the buffer
1366 if (pmod->full_path) {
1367 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1368 }
1369 pmod->base_addr = base_addr;
1370 return 1;
1371 }
1372 return 0;
1373 }
1374
1375 bool os::dll_address_to_library_name(address addr, char* buf,
1376 int buflen, int* offset) {
1377 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1378 // return the full path to the DLL file, sometimes it returns path
1379 // to the corresponding PDB file (debug info); sometimes it only
1380 // returns partial path, which makes life painful.
1381
1382 struct _modinfo mi;
1383 mi.addr = addr;
1384 mi.full_path = buf;
1385 mi.buflen = buflen;
1386 int pid = os::current_process_id();
1387 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1388 // buf already contains path name
1389 if (offset) *offset = addr - mi.base_addr;
1390 return true;
1391 } else {
1392 if (buf) buf[0] = '\0';
1393 if (offset) *offset = -1;
1394 return false;
1395 }
1396 }
1397
1398 bool os::dll_address_to_function_name(address addr, char *buf,
1399 int buflen, int *offset) {
1400 if (Decoder::decode(addr, buf, buflen, offset)) {
1401 return true;
1402 }
1403 if (offset != NULL) *offset = -1;
1404 if (buf != NULL) buf[0] = '\0';
1405 return false;
1406 }
1407
1408 // save the start and end address of jvm.dll into param[0] and param[1]
1409 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1410 unsigned size, void * param) {
1411 if (!param) return -1;
1412
1413 if (base_addr <= (address)_locate_jvm_dll &&
1414 base_addr+size > (address)_locate_jvm_dll) {
1415 ((address*)param)[0] = base_addr;
1416 ((address*)param)[1] = base_addr + size;
1417 return 1;
1418 }
1419 return 0;
1420 }
1421
1422 address vm_lib_location[2]; // start and end address of jvm.dll
1423
1424 // check if addr is inside jvm.dll
1425 bool os::address_is_in_vm(address addr) {
1426 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1427 int pid = os::current_process_id();
1428 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1429 assert(false, "Can't find jvm module.");
1430 return false;
1431 }
1432 }
1433
1434 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1435 }
1436
1437 // print module info; param is outputStream*
1438 static int _print_module(int pid, char* fname, address base,
1439 unsigned size, void* param) {
1440 if (!param) return -1;
1441
1442 outputStream* st = (outputStream*)param;
1443
1444 address end_addr = base + size;
1445 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1446 return 0;
1447 }
1448
1449 // Loads .dll/.so and
1450 // in case of error it checks if .dll/.so was built for the
1451 // same architecture as Hotspot is running on
1452 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1453 {
1454 void * result = LoadLibrary(name);
1455 if (result != NULL)
1456 {
1457 return result;
1458 }
1459
1460 DWORD errcode = GetLastError();
1461 if (errcode == ERROR_MOD_NOT_FOUND) {
1462 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1463 ebuf[ebuflen-1]='\0';
1464 return NULL;
1465 }
1466
1467 // Parsing dll below
1468 // If we can read dll-info and find that dll was built
1469 // for an architecture other than Hotspot is running in
1470 // - then print to buffer "DLL was built for a different architecture"
1471 // else call os::lasterror to obtain system error message
1472
1473 // Read system error message into ebuf
1474 // It may or may not be overwritten below (in the for loop and just above)
1475 lasterror(ebuf, (size_t) ebuflen);
1476 ebuf[ebuflen-1]='\0';
1477 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1478 if (file_descriptor<0)
1479 {
1480 return NULL;
1481 }
1482
1483 uint32_t signature_offset;
1484 uint16_t lib_arch=0;
1485 bool failed_to_get_lib_arch=
1486 (
1487 //Go to position 3c in the dll
1488 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1489 ||
1490 // Read loacation of signature
1491 (sizeof(signature_offset)!=
1492 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1493 ||
1494 //Go to COFF File Header in dll
1495 //that is located after"signature" (4 bytes long)
1496 (os::seek_to_file_offset(file_descriptor,
1497 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1498 ||
1499 //Read field that contains code of architecture
1500 // that dll was build for
1501 (sizeof(lib_arch)!=
1502 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1503 );
1504
1505 ::close(file_descriptor);
1506 if (failed_to_get_lib_arch)
1507 {
1508 // file i/o error - report os::lasterror(...) msg
1509 return NULL;
1510 }
1511
1512 typedef struct
1513 {
1514 uint16_t arch_code;
1515 char* arch_name;
1516 } arch_t;
1517
1518 static const arch_t arch_array[]={
1519 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1520 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1521 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1522 };
1523 #if (defined _M_IA64)
1524 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1525 #elif (defined _M_AMD64)
1526 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1527 #elif (defined _M_IX86)
1528 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1529 #else
1530 #error Method os::dll_load requires that one of following \
1531 is defined :_M_IA64,_M_AMD64 or _M_IX86
1532 #endif
1533
1534
1535 // Obtain a string for printf operation
1536 // lib_arch_str shall contain string what platform this .dll was built for
1537 // running_arch_str shall string contain what platform Hotspot was built for
1538 char *running_arch_str=NULL,*lib_arch_str=NULL;
1539 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1540 {
1541 if (lib_arch==arch_array[i].arch_code)
1542 lib_arch_str=arch_array[i].arch_name;
1543 if (running_arch==arch_array[i].arch_code)
1544 running_arch_str=arch_array[i].arch_name;
1545 }
1546
1547 assert(running_arch_str,
1548 "Didn't find runing architecture code in arch_array");
1549
1550 // If the architure is right
1551 // but some other error took place - report os::lasterror(...) msg
1552 if (lib_arch == running_arch)
1553 {
1554 return NULL;
1555 }
1556
1557 if (lib_arch_str!=NULL)
1558 {
1559 ::_snprintf(ebuf, ebuflen-1,
1560 "Can't load %s-bit .dll on a %s-bit platform",
1561 lib_arch_str,running_arch_str);
1562 }
1563 else
1564 {
1565 // don't know what architecture this dll was build for
1566 ::_snprintf(ebuf, ebuflen-1,
1567 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1568 lib_arch,running_arch_str);
1569 }
1570
1571 return NULL;
1572 }
1573
1574
1575 void os::print_dll_info(outputStream *st) {
1576 int pid = os::current_process_id();
1577 st->print_cr("Dynamic libraries:");
1578 enumerate_modules(pid, _print_module, (void *)st);
1579 }
1580
1581 void os::print_os_info_brief(outputStream* st) {
1582 os::print_os_info(st);
1583 }
1584
1585 void os::print_os_info(outputStream* st) {
1586 st->print("OS:");
1587
1588 os::win32::print_windows_version(st);
1589 }
1590
1591 void os::win32::print_windows_version(outputStream* st) {
1592 OSVERSIONINFOEX osvi;
1593 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1594 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1595
1596 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1597 st->print_cr("N/A");
1598 return;
1599 }
1600
1601 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1602 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1603 switch (os_vers) {
1604 case 3051: st->print(" Windows NT 3.51"); break;
1605 case 4000: st->print(" Windows NT 4.0"); break;
1606 case 5000: st->print(" Windows 2000"); break;
1607 case 5001: st->print(" Windows XP"); break;
1608 case 5002:
1609 case 6000:
1610 case 6001:
1611 case 6002: {
1612 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1613 // find out whether we are running on 64 bit processor or not.
1614 SYSTEM_INFO si;
1615 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1616 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1617 GetSystemInfo(&si);
1618 } else {
1619 os::Kernel32Dll::GetNativeSystemInfo(&si);
1620 }
1621 if (os_vers == 5002) {
1622 if (osvi.wProductType == VER_NT_WORKSTATION &&
1623 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1624 st->print(" Windows XP x64 Edition");
1625 else
1626 st->print(" Windows Server 2003 family");
1627 } else if (os_vers == 6000) {
1628 if (osvi.wProductType == VER_NT_WORKSTATION)
1629 st->print(" Windows Vista");
1630 else
1631 st->print(" Windows Server 2008");
1632 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1633 st->print(" , 64 bit");
1634 } else if (os_vers == 6001) {
1635 if (osvi.wProductType == VER_NT_WORKSTATION) {
1636 st->print(" Windows 7");
1637 } else {
1638 // Unrecognized windows, print out its major and minor versions
1639 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1640 }
1641 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1642 st->print(" , 64 bit");
1643 } else if (os_vers == 6002) {
1644 if (osvi.wProductType == VER_NT_WORKSTATION) {
1645 st->print(" Windows 8");
1646 } else {
1647 st->print(" Windows Server 2012");
1648 }
1649 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1650 st->print(" , 64 bit");
1651 } else { // future os
1652 // Unrecognized windows, print out its major and minor versions
1653 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1654 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1655 st->print(" , 64 bit");
1656 }
1657 break;
1658 }
1659 default: // future windows, print out its major and minor versions
1660 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1661 }
1662 } else {
1663 switch (os_vers) {
1664 case 4000: st->print(" Windows 95"); break;
1665 case 4010: st->print(" Windows 98"); break;
1666 case 4090: st->print(" Windows Me"); break;
1667 default: // future windows, print out its major and minor versions
1668 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1669 }
1670 }
1671 st->print(" Build %d", osvi.dwBuildNumber);
1672 st->print(" %s", osvi.szCSDVersion); // service pack
1673 st->cr();
1674 }
1675
1676 void os::pd_print_cpu_info(outputStream* st) {
1677 // Nothing to do for now.
1678 }
1679
1680 void os::print_memory_info(outputStream* st) {
1681 st->print("Memory:");
1682 st->print(" %dk page", os::vm_page_size()>>10);
1683
1684 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1685 // value if total memory is larger than 4GB
1686 MEMORYSTATUSEX ms;
1687 ms.dwLength = sizeof(ms);
1688 GlobalMemoryStatusEx(&ms);
1689
1690 st->print(", physical %uk", os::physical_memory() >> 10);
1691 st->print("(%uk free)", os::available_memory() >> 10);
1692
1693 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1694 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1695 st->cr();
1696 }
1697
1698 void os::print_siginfo(outputStream *st, void *siginfo) {
1699 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1700 st->print("siginfo:");
1701 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1702
1703 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1704 er->NumberParameters >= 2) {
1705 switch (er->ExceptionInformation[0]) {
1706 case 0: st->print(", reading address"); break;
1707 case 1: st->print(", writing address"); break;
1708 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1709 er->ExceptionInformation[0]);
1710 }
1711 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1712 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1713 er->NumberParameters >= 2 && UseSharedSpaces) {
1714 FileMapInfo* mapinfo = FileMapInfo::current_info();
1715 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1716 st->print("\n\nError accessing class data sharing archive." \
1717 " Mapped file inaccessible during execution, " \
1718 " possible disk/network problem.");
1719 }
1720 } else {
1721 int num = er->NumberParameters;
1722 if (num > 0) {
1723 st->print(", ExceptionInformation=");
1724 for (int i = 0; i < num; i++) {
1725 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1726 }
1727 }
1728 }
1729 st->cr();
1730 }
1731
1732 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1733 // do nothing
1734 }
1735
1736 static char saved_jvm_path[MAX_PATH] = {0};
1737
1738 // Find the full path to the current module, jvm.dll or jvm_g.dll
1739 void os::jvm_path(char *buf, jint buflen) {
1740 // Error checking.
1741 if (buflen < MAX_PATH) {
1742 assert(false, "must use a large-enough buffer");
1743 buf[0] = '\0';
1744 return;
1745 }
1746 // Lazy resolve the path to current module.
1747 if (saved_jvm_path[0] != 0) {
1748 strcpy(buf, saved_jvm_path);
1749 return;
1750 }
1751
1752 buf[0] = '\0';
1753 if (Arguments::created_by_gamma_launcher()) {
1754 // Support for the gamma launcher. Check for an
1755 // JAVA_HOME environment variable
1756 // and fix up the path so it looks like
1757 // libjvm.so is installed there (append a fake suffix
1758 // hotspot/libjvm.so).
1759 char* java_home_var = ::getenv("JAVA_HOME");
1760 if (java_home_var != NULL && java_home_var[0] != 0) {
1761
1762 strncpy(buf, java_home_var, buflen);
1763
1764 // determine if this is a legacy image or modules image
1765 // modules image doesn't have "jre" subdirectory
1766 size_t len = strlen(buf);
1767 char* jrebin_p = buf + len;
1768 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1769 if (0 != _access(buf, 0)) {
1770 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1771 }
1772 len = strlen(buf);
1773 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1774 }
1775 }
1776
1777 if(buf[0] == '\0') {
1778 GetModuleFileName(vm_lib_handle, buf, buflen);
1779 }
1780 strcpy(saved_jvm_path, buf);
1781 }
1782
1783
1784 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1785 #ifndef _WIN64
1786 st->print("_");
1787 #endif
1788 }
1789
1790
1791 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1792 #ifndef _WIN64
1793 st->print("@%d", args_size * sizeof(int));
1794 #endif
1795 }
1796
1797 // This method is a copy of JDK's sysGetLastErrorString
1798 // from src/windows/hpi/src/system_md.c
1799
1800 size_t os::lasterror(char* buf, size_t len) {
1801 DWORD errval;
1802
1803 if ((errval = GetLastError()) != 0) {
1804 // DOS error
1805 size_t n = (size_t)FormatMessage(
1806 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1807 NULL,
1808 errval,
1809 0,
1810 buf,
1811 (DWORD)len,
1812 NULL);
1813 if (n > 3) {
1814 // Drop final '.', CR, LF
1815 if (buf[n - 1] == '\n') n--;
1816 if (buf[n - 1] == '\r') n--;
1817 if (buf[n - 1] == '.') n--;
1818 buf[n] = '\0';
1819 }
1820 return n;
1821 }
1822
1823 if (errno != 0) {
1824 // C runtime error that has no corresponding DOS error code
1825 const char* s = strerror(errno);
1826 size_t n = strlen(s);
1827 if (n >= len) n = len - 1;
1828 strncpy(buf, s, n);
1829 buf[n] = '\0';
1830 return n;
1831 }
1832
1833 return 0;
1834 }
1835
1836 int os::get_last_error() {
1837 DWORD error = GetLastError();
1838 if (error == 0)
1839 error = errno;
1840 return (int)error;
1841 }
1842
1843 // sun.misc.Signal
1844 // NOTE that this is a workaround for an apparent kernel bug where if
1845 // a signal handler for SIGBREAK is installed then that signal handler
1846 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1847 // See bug 4416763.
1848 static void (*sigbreakHandler)(int) = NULL;
1849
1850 static void UserHandler(int sig, void *siginfo, void *context) {
1851 os::signal_notify(sig);
1852 // We need to reinstate the signal handler each time...
1853 os::signal(sig, (void*)UserHandler);
1854 }
1855
1856 void* os::user_handler() {
1857 return (void*) UserHandler;
1858 }
1859
1860 void* os::signal(int signal_number, void* handler) {
1861 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1862 void (*oldHandler)(int) = sigbreakHandler;
1863 sigbreakHandler = (void (*)(int)) handler;
1864 return (void*) oldHandler;
1865 } else {
1866 return (void*)::signal(signal_number, (void (*)(int))handler);
1867 }
1868 }
1869
1870 void os::signal_raise(int signal_number) {
1871 raise(signal_number);
1872 }
1873
1874 // The Win32 C runtime library maps all console control events other than ^C
1875 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1876 // logoff, and shutdown events. We therefore install our own console handler
1877 // that raises SIGTERM for the latter cases.
1878 //
1879 static BOOL WINAPI consoleHandler(DWORD event) {
1880 switch(event) {
1881 case CTRL_C_EVENT:
1882 if (is_error_reported()) {
1883 // Ctrl-C is pressed during error reporting, likely because the error
1884 // handler fails to abort. Let VM die immediately.
1885 os::die();
1886 }
1887
1888 os::signal_raise(SIGINT);
1889 return TRUE;
1890 break;
1891 case CTRL_BREAK_EVENT:
1892 if (sigbreakHandler != NULL) {
1893 (*sigbreakHandler)(SIGBREAK);
1894 }
1895 return TRUE;
1896 break;
1897 case CTRL_CLOSE_EVENT:
1898 case CTRL_LOGOFF_EVENT:
1899 case CTRL_SHUTDOWN_EVENT:
1900 os::signal_raise(SIGTERM);
1901 return TRUE;
1902 break;
1903 default:
1904 break;
1905 }
1906 return FALSE;
1907 }
1908
1909 /*
1910 * The following code is moved from os.cpp for making this
1911 * code platform specific, which it is by its very nature.
1912 */
1913
1914 // Return maximum OS signal used + 1 for internal use only
1915 // Used as exit signal for signal_thread
1916 int os::sigexitnum_pd(){
1917 return NSIG;
1918 }
1919
1920 // a counter for each possible signal value, including signal_thread exit signal
1921 static volatile jint pending_signals[NSIG+1] = { 0 };
1922 static HANDLE sig_sem;
1923
1924 void os::signal_init_pd() {
1925 // Initialize signal structures
1926 memset((void*)pending_signals, 0, sizeof(pending_signals));
1927
1928 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1929
1930 // Programs embedding the VM do not want it to attempt to receive
1931 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1932 // shutdown hooks mechanism introduced in 1.3. For example, when
1933 // the VM is run as part of a Windows NT service (i.e., a servlet
1934 // engine in a web server), the correct behavior is for any console
1935 // control handler to return FALSE, not TRUE, because the OS's
1936 // "final" handler for such events allows the process to continue if
1937 // it is a service (while terminating it if it is not a service).
1938 // To make this behavior uniform and the mechanism simpler, we
1939 // completely disable the VM's usage of these console events if -Xrs
1940 // (=ReduceSignalUsage) is specified. This means, for example, that
1941 // the CTRL-BREAK thread dump mechanism is also disabled in this
1942 // case. See bugs 4323062, 4345157, and related bugs.
1943
1944 if (!ReduceSignalUsage) {
1945 // Add a CTRL-C handler
1946 SetConsoleCtrlHandler(consoleHandler, TRUE);
1947 }
1948 }
1949
1950 void os::signal_notify(int signal_number) {
1951 BOOL ret;
1952
1953 Atomic::inc(&pending_signals[signal_number]);
1954 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1955 assert(ret != 0, "ReleaseSemaphore() failed");
1956 }
1957
1958 static int check_pending_signals(bool wait_for_signal) {
1959 DWORD ret;
1960 while (true) {
1961 for (int i = 0; i < NSIG + 1; i++) {
1962 jint n = pending_signals[i];
1963 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1964 return i;
1965 }
1966 }
1967 if (!wait_for_signal) {
1968 return -1;
1969 }
1970
1971 JavaThread *thread = JavaThread::current();
1972
1973 ThreadBlockInVM tbivm(thread);
1974
1975 bool threadIsSuspended;
1976 do {
1977 thread->set_suspend_equivalent();
1978 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1979 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1980 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1981
1982 // were we externally suspended while we were waiting?
1983 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1984 if (threadIsSuspended) {
1985 //
1986 // The semaphore has been incremented, but while we were waiting
1987 // another thread suspended us. We don't want to continue running
1988 // while suspended because that would surprise the thread that
1989 // suspended us.
1990 //
1991 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1992 assert(ret != 0, "ReleaseSemaphore() failed");
1993
1994 thread->java_suspend_self();
1995 }
1996 } while (threadIsSuspended);
1997 }
1998 }
1999
2000 int os::signal_lookup() {
2001 return check_pending_signals(false);
2002 }
2003
2004 int os::signal_wait() {
2005 return check_pending_signals(true);
2006 }
2007
2008 // Implicit OS exception handling
2009
2010 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2011 JavaThread* thread = JavaThread::current();
2012 // Save pc in thread
2013 #ifdef _M_IA64
2014 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
2015 // Set pc to handler
2016 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2017 #elif _M_AMD64
2018 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
2019 // Set pc to handler
2020 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2021 #else
2022 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
2023 // Set pc to handler
2024 exceptionInfo->ContextRecord->Eip = (LONG)handler;
2025 #endif
2026
2027 // Continue the execution
2028 return EXCEPTION_CONTINUE_EXECUTION;
2029 }
2030
2031
2032 // Used for PostMortemDump
2033 extern "C" void safepoints();
2034 extern "C" void find(int x);
2035 extern "C" void events();
2036
2037 // According to Windows API documentation, an illegal instruction sequence should generate
2038 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2039 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2040 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2041
2042 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2043
2044 // From "Execution Protection in the Windows Operating System" draft 0.35
2045 // Once a system header becomes available, the "real" define should be
2046 // included or copied here.
2047 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2048
2049 #define def_excpt(val) #val, val
2050
2051 struct siglabel {
2052 char *name;
2053 int number;
2054 };
2055
2056 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2057 // C++ compiler contain this error code. Because this is a compiler-generated
2058 // error, the code is not listed in the Win32 API header files.
2059 // The code is actually a cryptic mnemonic device, with the initial "E"
2060 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2061 // ASCII values of "msc".
2062
2063 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2064
2065
2066 struct siglabel exceptlabels[] = {
2067 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2068 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2069 def_excpt(EXCEPTION_BREAKPOINT),
2070 def_excpt(EXCEPTION_SINGLE_STEP),
2071 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2072 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2073 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2074 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2075 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2076 def_excpt(EXCEPTION_FLT_OVERFLOW),
2077 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2078 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2079 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2080 def_excpt(EXCEPTION_INT_OVERFLOW),
2081 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2082 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2083 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2084 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2085 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2086 def_excpt(EXCEPTION_STACK_OVERFLOW),
2087 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2088 def_excpt(EXCEPTION_GUARD_PAGE),
2089 def_excpt(EXCEPTION_INVALID_HANDLE),
2090 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2091 NULL, 0
2092 };
2093
2094 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2095 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2096 if (exceptlabels[i].number == exception_code) {
2097 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2098 return buf;
2099 }
2100 }
2101
2102 return NULL;
2103 }
2104
2105 //-----------------------------------------------------------------------------
2106 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2107 // handle exception caused by idiv; should only happen for -MinInt/-1
2108 // (division by zero is handled explicitly)
2109 #ifdef _M_IA64
2110 assert(0, "Fix Handle_IDiv_Exception");
2111 #elif _M_AMD64
2112 PCONTEXT ctx = exceptionInfo->ContextRecord;
2113 address pc = (address)ctx->Rip;
2114 assert(pc[0] == 0xF7, "not an idiv opcode");
2115 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2116 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2117 // set correct result values and continue after idiv instruction
2118 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2119 ctx->Rax = (DWORD)min_jint; // result
2120 ctx->Rdx = (DWORD)0; // remainder
2121 // Continue the execution
2122 #else
2123 PCONTEXT ctx = exceptionInfo->ContextRecord;
2124 address pc = (address)ctx->Eip;
2125 assert(pc[0] == 0xF7, "not an idiv opcode");
2126 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2127 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2128 // set correct result values and continue after idiv instruction
2129 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2130 ctx->Eax = (DWORD)min_jint; // result
2131 ctx->Edx = (DWORD)0; // remainder
2132 // Continue the execution
2133 #endif
2134 return EXCEPTION_CONTINUE_EXECUTION;
2135 }
2136
2137 #ifndef _WIN64
2138 //-----------------------------------------------------------------------------
2139 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2140 // handle exception caused by native method modifying control word
2141 PCONTEXT ctx = exceptionInfo->ContextRecord;
2142 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2143
2144 switch (exception_code) {
2145 case EXCEPTION_FLT_DENORMAL_OPERAND:
2146 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2147 case EXCEPTION_FLT_INEXACT_RESULT:
2148 case EXCEPTION_FLT_INVALID_OPERATION:
2149 case EXCEPTION_FLT_OVERFLOW:
2150 case EXCEPTION_FLT_STACK_CHECK:
2151 case EXCEPTION_FLT_UNDERFLOW:
2152 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2153 if (fp_control_word != ctx->FloatSave.ControlWord) {
2154 // Restore FPCW and mask out FLT exceptions
2155 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2156 // Mask out pending FLT exceptions
2157 ctx->FloatSave.StatusWord &= 0xffffff00;
2158 return EXCEPTION_CONTINUE_EXECUTION;
2159 }
2160 }
2161
2162 if (prev_uef_handler != NULL) {
2163 // We didn't handle this exception so pass it to the previous
2164 // UnhandledExceptionFilter.
2165 return (prev_uef_handler)(exceptionInfo);
2166 }
2167
2168 return EXCEPTION_CONTINUE_SEARCH;
2169 }
2170 #else //_WIN64
2171 /*
2172 On Windows, the mxcsr control bits are non-volatile across calls
2173 See also CR 6192333
2174 If EXCEPTION_FLT_* happened after some native method modified
2175 mxcsr - it is not a jvm fault.
2176 However should we decide to restore of mxcsr after a faulty
2177 native method we can uncomment following code
2178 jint MxCsr = INITIAL_MXCSR;
2179 // we can't use StubRoutines::addr_mxcsr_std()
2180 // because in Win64 mxcsr is not saved there
2181 if (MxCsr != ctx->MxCsr) {
2182 ctx->MxCsr = MxCsr;
2183 return EXCEPTION_CONTINUE_EXECUTION;
2184 }
2185
2186 */
2187 #endif //_WIN64
2188
2189
2190 // Fatal error reporting is single threaded so we can make this a
2191 // static and preallocated. If it's more than MAX_PATH silently ignore
2192 // it.
2193 static char saved_error_file[MAX_PATH] = {0};
2194
2195 void os::set_error_file(const char *logfile) {
2196 if (strlen(logfile) <= MAX_PATH) {
2197 strncpy(saved_error_file, logfile, MAX_PATH);
2198 }
2199 }
2200
2201 static inline void report_error(Thread* t, DWORD exception_code,
2202 address addr, void* siginfo, void* context) {
2203 VMError err(t, exception_code, addr, siginfo, context);
2204 err.report_and_die();
2205
2206 // If UseOsErrorReporting, this will return here and save the error file
2207 // somewhere where we can find it in the minidump.
2208 }
2209
2210 //-----------------------------------------------------------------------------
2211 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2212 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2213 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2214 #ifdef _M_IA64
2215 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2216 #elif _M_AMD64
2217 address pc = (address) exceptionInfo->ContextRecord->Rip;
2218 #else
2219 address pc = (address) exceptionInfo->ContextRecord->Eip;
2220 #endif
2221 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2222
2223 #ifndef _WIN64
2224 // Execution protection violation - win32 running on AMD64 only
2225 // Handled first to avoid misdiagnosis as a "normal" access violation;
2226 // This is safe to do because we have a new/unique ExceptionInformation
2227 // code for this condition.
2228 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2229 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2230 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2231 address addr = (address) exceptionRecord->ExceptionInformation[1];
2232
2233 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2234 int page_size = os::vm_page_size();
2235
2236 // Make sure the pc and the faulting address are sane.
2237 //
2238 // If an instruction spans a page boundary, and the page containing
2239 // the beginning of the instruction is executable but the following
2240 // page is not, the pc and the faulting address might be slightly
2241 // different - we still want to unguard the 2nd page in this case.
2242 //
2243 // 15 bytes seems to be a (very) safe value for max instruction size.
2244 bool pc_is_near_addr =
2245 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2246 bool instr_spans_page_boundary =
2247 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2248 (intptr_t) page_size) > 0);
2249
2250 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2251 static volatile address last_addr =
2252 (address) os::non_memory_address_word();
2253
2254 // In conservative mode, don't unguard unless the address is in the VM
2255 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2256 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2257
2258 // Set memory to RWX and retry
2259 address page_start =
2260 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2261 bool res = os::protect_memory((char*) page_start, page_size,
2262 os::MEM_PROT_RWX);
2263
2264 if (PrintMiscellaneous && Verbose) {
2265 char buf[256];
2266 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2267 "at " INTPTR_FORMAT
2268 ", unguarding " INTPTR_FORMAT ": %s", addr,
2269 page_start, (res ? "success" : strerror(errno)));
2270 tty->print_raw_cr(buf);
2271 }
2272
2273 // Set last_addr so if we fault again at the same address, we don't
2274 // end up in an endless loop.
2275 //
2276 // There are two potential complications here. Two threads trapping
2277 // at the same address at the same time could cause one of the
2278 // threads to think it already unguarded, and abort the VM. Likely
2279 // very rare.
2280 //
2281 // The other race involves two threads alternately trapping at
2282 // different addresses and failing to unguard the page, resulting in
2283 // an endless loop. This condition is probably even more unlikely
2284 // than the first.
2285 //
2286 // Although both cases could be avoided by using locks or thread
2287 // local last_addr, these solutions are unnecessary complication:
2288 // this handler is a best-effort safety net, not a complete solution.
2289 // It is disabled by default and should only be used as a workaround
2290 // in case we missed any no-execute-unsafe VM code.
2291
2292 last_addr = addr;
2293
2294 return EXCEPTION_CONTINUE_EXECUTION;
2295 }
2296 }
2297
2298 // Last unguard failed or not unguarding
2299 tty->print_raw_cr("Execution protection violation");
2300 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2301 exceptionInfo->ContextRecord);
2302 return EXCEPTION_CONTINUE_SEARCH;
2303 }
2304 }
2305 #endif // _WIN64
2306
2307 // Check to see if we caught the safepoint code in the
2308 // process of write protecting the memory serialization page.
2309 // It write enables the page immediately after protecting it
2310 // so just return.
2311 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2312 JavaThread* thread = (JavaThread*) t;
2313 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2314 address addr = (address) exceptionRecord->ExceptionInformation[1];
2315 if ( os::is_memory_serialize_page(thread, addr) ) {
2316 // Block current thread until the memory serialize page permission restored.
2317 os::block_on_serialize_page_trap();
2318 return EXCEPTION_CONTINUE_EXECUTION;
2319 }
2320 }
2321
2322 if (t != NULL && t->is_Java_thread()) {
2323 JavaThread* thread = (JavaThread*) t;
2324 bool in_java = thread->thread_state() == _thread_in_Java;
2325
2326 // Handle potential stack overflows up front.
2327 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2328 if (os::uses_stack_guard_pages()) {
2329 #ifdef _M_IA64
2330 //
2331 // If it's a legal stack address continue, Windows will map it in.
2332 //
2333 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2334 address addr = (address) exceptionRecord->ExceptionInformation[1];
2335 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2336 return EXCEPTION_CONTINUE_EXECUTION;
2337
2338 // The register save area is the same size as the memory stack
2339 // and starts at the page just above the start of the memory stack.
2340 // If we get a fault in this area, we've run out of register
2341 // stack. If we are in java, try throwing a stack overflow exception.
2342 if (addr > thread->stack_base() &&
2343 addr <= (thread->stack_base()+thread->stack_size()) ) {
2344 char buf[256];
2345 jio_snprintf(buf, sizeof(buf),
2346 "Register stack overflow, addr:%p, stack_base:%p\n",
2347 addr, thread->stack_base() );
2348 tty->print_raw_cr(buf);
2349 // If not in java code, return and hope for the best.
2350 return in_java ? Handle_Exception(exceptionInfo,
2351 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2352 : EXCEPTION_CONTINUE_EXECUTION;
2353 }
2354 #endif
2355 if (thread->stack_yellow_zone_enabled()) {
2356 // Yellow zone violation. The o/s has unprotected the first yellow
2357 // zone page for us. Note: must call disable_stack_yellow_zone to
2358 // update the enabled status, even if the zone contains only one page.
2359 thread->disable_stack_yellow_zone();
2360 // If not in java code, return and hope for the best.
2361 return in_java ? Handle_Exception(exceptionInfo,
2362 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2363 : EXCEPTION_CONTINUE_EXECUTION;
2364 } else {
2365 // Fatal red zone violation.
2366 thread->disable_stack_red_zone();
2367 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2368 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2369 exceptionInfo->ContextRecord);
2370 return EXCEPTION_CONTINUE_SEARCH;
2371 }
2372 } else if (in_java) {
2373 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2374 // a one-time-only guard page, which it has released to us. The next
2375 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2376 return Handle_Exception(exceptionInfo,
2377 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2378 } else {
2379 // Can only return and hope for the best. Further stack growth will
2380 // result in an ACCESS_VIOLATION.
2381 return EXCEPTION_CONTINUE_EXECUTION;
2382 }
2383 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2384 // Either stack overflow or null pointer exception.
2385 if (in_java) {
2386 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2387 address addr = (address) exceptionRecord->ExceptionInformation[1];
2388 address stack_end = thread->stack_base() - thread->stack_size();
2389 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2390 // Stack overflow.
2391 assert(!os::uses_stack_guard_pages(),
2392 "should be caught by red zone code above.");
2393 return Handle_Exception(exceptionInfo,
2394 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2395 }
2396 //
2397 // Check for safepoint polling and implicit null
2398 // We only expect null pointers in the stubs (vtable)
2399 // the rest are checked explicitly now.
2400 //
2401 CodeBlob* cb = CodeCache::find_blob(pc);
2402 if (cb != NULL) {
2403 if (os::is_poll_address(addr)) {
2404 address stub = SharedRuntime::get_poll_stub(pc);
2405 return Handle_Exception(exceptionInfo, stub);
2406 }
2407 }
2408 {
2409 #ifdef _WIN64
2410 //
2411 // If it's a legal stack address map the entire region in
2412 //
2413 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2414 address addr = (address) exceptionRecord->ExceptionInformation[1];
2415 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2416 addr = (address)((uintptr_t)addr &
2417 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2418 os::commit_memory((char *)addr, thread->stack_base() - addr,
2419 false );
2420 return EXCEPTION_CONTINUE_EXECUTION;
2421 }
2422 else
2423 #endif
2424 {
2425 // Null pointer exception.
2426 #ifdef _M_IA64
2427 // We catch register stack overflows in compiled code by doing
2428 // an explicit compare and executing a st8(G0, G0) if the
2429 // BSP enters into our guard area. We test for the overflow
2430 // condition and fall into the normal null pointer exception
2431 // code if BSP hasn't overflowed.
2432 if ( in_java ) {
2433 if(thread->register_stack_overflow()) {
2434 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2435 thread->register_stack_limit(),
2436 "GR7 doesn't contain register_stack_limit");
2437 // Disable the yellow zone which sets the state that
2438 // we've got a stack overflow problem.
2439 if (thread->stack_yellow_zone_enabled()) {
2440 thread->disable_stack_yellow_zone();
2441 }
2442 // Give us some room to process the exception
2443 thread->disable_register_stack_guard();
2444 // Update GR7 with the new limit so we can continue running
2445 // compiled code.
2446 exceptionInfo->ContextRecord->IntS3 =
2447 (ULONGLONG)thread->register_stack_limit();
2448 return Handle_Exception(exceptionInfo,
2449 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2450 } else {
2451 //
2452 // Check for implicit null
2453 // We only expect null pointers in the stubs (vtable)
2454 // the rest are checked explicitly now.
2455 //
2456 if (((uintptr_t)addr) < os::vm_page_size() ) {
2457 // an access to the first page of VM--assume it is a null pointer
2458 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2459 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2460 }
2461 }
2462 } // in_java
2463
2464 // IA64 doesn't use implicit null checking yet. So we shouldn't
2465 // get here.
2466 tty->print_raw_cr("Access violation, possible null pointer exception");
2467 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2468 exceptionInfo->ContextRecord);
2469 return EXCEPTION_CONTINUE_SEARCH;
2470 #else /* !IA64 */
2471
2472 // Windows 98 reports faulting addresses incorrectly
2473 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2474 !os::win32::is_nt()) {
2475 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2476 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2477 }
2478 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2479 exceptionInfo->ContextRecord);
2480 return EXCEPTION_CONTINUE_SEARCH;
2481 #endif
2482 }
2483 }
2484 }
2485
2486 #ifdef _WIN64
2487 // Special care for fast JNI field accessors.
2488 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2489 // in and the heap gets shrunk before the field access.
2490 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2491 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2492 if (addr != (address)-1) {
2493 return Handle_Exception(exceptionInfo, addr);
2494 }
2495 }
2496 #endif
2497
2498 #ifdef _WIN64
2499 // Windows will sometimes generate an access violation
2500 // when we call malloc. Since we use VectoredExceptions
2501 // on 64 bit platforms, we see this exception. We must
2502 // pass this exception on so Windows can recover.
2503 // We check to see if the pc of the fault is in NTDLL.DLL
2504 // if so, we pass control on to Windows for handling.
2505 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2506 #endif
2507
2508 // Stack overflow or null pointer exception in native code.
2509 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2510 exceptionInfo->ContextRecord);
2511 return EXCEPTION_CONTINUE_SEARCH;
2512 }
2513
2514 if (in_java) {
2515 switch (exception_code) {
2516 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2517 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2518
2519 case EXCEPTION_INT_OVERFLOW:
2520 return Handle_IDiv_Exception(exceptionInfo);
2521
2522 } // switch
2523 }
2524 #ifndef _WIN64
2525 if (((thread->thread_state() == _thread_in_Java) ||
2526 (thread->thread_state() == _thread_in_native)) &&
2527 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2528 {
2529 LONG result=Handle_FLT_Exception(exceptionInfo);
2530 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2531 }
2532 #endif //_WIN64
2533 }
2534
2535 if (exception_code != EXCEPTION_BREAKPOINT) {
2536 #ifndef _WIN64
2537 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2538 exceptionInfo->ContextRecord);
2539 #else
2540 // Itanium Windows uses a VectoredExceptionHandler
2541 // Which means that C++ programatic exception handlers (try/except)
2542 // will get here. Continue the search for the right except block if
2543 // the exception code is not a fatal code.
2544 switch ( exception_code ) {
2545 case EXCEPTION_ACCESS_VIOLATION:
2546 case EXCEPTION_STACK_OVERFLOW:
2547 case EXCEPTION_ILLEGAL_INSTRUCTION:
2548 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2549 case EXCEPTION_INT_OVERFLOW:
2550 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2551 case EXCEPTION_UNCAUGHT_CXX_EXCEPTION:
2552 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2553 exceptionInfo->ContextRecord);
2554 }
2555 break;
2556 default:
2557 break;
2558 }
2559 #endif
2560 }
2561 return EXCEPTION_CONTINUE_SEARCH;
2562 }
2563
2564 #ifndef _WIN64
2565 // Special care for fast JNI accessors.
2566 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2567 // the heap gets shrunk before the field access.
2568 // Need to install our own structured exception handler since native code may
2569 // install its own.
2570 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2571 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2572 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2573 address pc = (address) exceptionInfo->ContextRecord->Eip;
2574 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2575 if (addr != (address)-1) {
2576 return Handle_Exception(exceptionInfo, addr);
2577 }
2578 }
2579 return EXCEPTION_CONTINUE_SEARCH;
2580 }
2581
2582 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2583 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2584 __try { \
2585 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2586 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2587 } \
2588 return 0; \
2589 }
2590
2591 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2592 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2593 DEFINE_FAST_GETFIELD(jchar, char, Char)
2594 DEFINE_FAST_GETFIELD(jshort, short, Short)
2595 DEFINE_FAST_GETFIELD(jint, int, Int)
2596 DEFINE_FAST_GETFIELD(jlong, long, Long)
2597 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2598 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2599
2600 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2601 switch (type) {
2602 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2603 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2604 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2605 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2606 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2607 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2608 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2609 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2610 default: ShouldNotReachHere();
2611 }
2612 return (address)-1;
2613 }
2614 #endif
2615
2616 // Virtual Memory
2617
2618 int os::vm_page_size() { return os::win32::vm_page_size(); }
2619 int os::vm_allocation_granularity() {
2620 return os::win32::vm_allocation_granularity();
2621 }
2622
2623 // Windows large page support is available on Windows 2003. In order to use
2624 // large page memory, the administrator must first assign additional privilege
2625 // to the user:
2626 // + select Control Panel -> Administrative Tools -> Local Security Policy
2627 // + select Local Policies -> User Rights Assignment
2628 // + double click "Lock pages in memory", add users and/or groups
2629 // + reboot
2630 // Note the above steps are needed for administrator as well, as administrators
2631 // by default do not have the privilege to lock pages in memory.
2632 //
2633 // Note about Windows 2003: although the API supports committing large page
2634 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2635 // scenario, I found through experiment it only uses large page if the entire
2636 // memory region is reserved and committed in a single VirtualAlloc() call.
2637 // This makes Windows large page support more or less like Solaris ISM, in
2638 // that the entire heap must be committed upfront. This probably will change
2639 // in the future, if so the code below needs to be revisited.
2640
2641 #ifndef MEM_LARGE_PAGES
2642 #define MEM_LARGE_PAGES 0x20000000
2643 #endif
2644
2645 static HANDLE _hProcess;
2646 static HANDLE _hToken;
2647
2648 // Container for NUMA node list info
2649 class NUMANodeListHolder {
2650 private:
2651 int *_numa_used_node_list; // allocated below
2652 int _numa_used_node_count;
2653
2654 void free_node_list() {
2655 if (_numa_used_node_list != NULL) {
2656 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2657 }
2658 }
2659
2660 public:
2661 NUMANodeListHolder() {
2662 _numa_used_node_count = 0;
2663 _numa_used_node_list = NULL;
2664 // do rest of initialization in build routine (after function pointers are set up)
2665 }
2666
2667 ~NUMANodeListHolder() {
2668 free_node_list();
2669 }
2670
2671 bool build() {
2672 DWORD_PTR proc_aff_mask;
2673 DWORD_PTR sys_aff_mask;
2674 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2675 ULONG highest_node_number;
2676 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2677 free_node_list();
2678 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2679 for (unsigned int i = 0; i <= highest_node_number; i++) {
2680 ULONGLONG proc_mask_numa_node;
2681 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2682 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2683 _numa_used_node_list[_numa_used_node_count++] = i;
2684 }
2685 }
2686 return (_numa_used_node_count > 1);
2687 }
2688
2689 int get_count() {return _numa_used_node_count;}
2690 int get_node_list_entry(int n) {
2691 // for indexes out of range, returns -1
2692 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2693 }
2694
2695 } numa_node_list_holder;
2696
2697
2698
2699 static size_t _large_page_size = 0;
2700
2701 static bool resolve_functions_for_large_page_init() {
2702 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2703 os::Advapi32Dll::AdvapiAvailable();
2704 }
2705
2706 static bool request_lock_memory_privilege() {
2707 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2708 os::current_process_id());
2709
2710 LUID luid;
2711 if (_hProcess != NULL &&
2712 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2713 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2714
2715 TOKEN_PRIVILEGES tp;
2716 tp.PrivilegeCount = 1;
2717 tp.Privileges[0].Luid = luid;
2718 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2719
2720 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2721 // privilege. Check GetLastError() too. See MSDN document.
2722 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2723 (GetLastError() == ERROR_SUCCESS)) {
2724 return true;
2725 }
2726 }
2727
2728 return false;
2729 }
2730
2731 static void cleanup_after_large_page_init() {
2732 if (_hProcess) CloseHandle(_hProcess);
2733 _hProcess = NULL;
2734 if (_hToken) CloseHandle(_hToken);
2735 _hToken = NULL;
2736 }
2737
2738 static bool numa_interleaving_init() {
2739 bool success = false;
2740 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2741
2742 // print a warning if UseNUMAInterleaving flag is specified on command line
2743 bool warn_on_failure = use_numa_interleaving_specified;
2744 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2745
2746 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2747 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2748 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2749
2750 if (os::Kernel32Dll::NumaCallsAvailable()) {
2751 if (numa_node_list_holder.build()) {
2752 if (PrintMiscellaneous && Verbose) {
2753 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2754 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2755 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2756 }
2757 tty->print("\n");
2758 }
2759 success = true;
2760 } else {
2761 WARN("Process does not cover multiple NUMA nodes.");
2762 }
2763 } else {
2764 WARN("NUMA Interleaving is not supported by the operating system.");
2765 }
2766 if (!success) {
2767 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2768 }
2769 return success;
2770 #undef WARN
2771 }
2772
2773 // this routine is used whenever we need to reserve a contiguous VA range
2774 // but we need to make separate VirtualAlloc calls for each piece of the range
2775 // Reasons for doing this:
2776 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2777 // * UseNUMAInterleaving requires a separate node for each piece
2778 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2779 bool should_inject_error=false) {
2780 char * p_buf;
2781 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2782 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2783 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2784
2785 // first reserve enough address space in advance since we want to be
2786 // able to break a single contiguous virtual address range into multiple
2787 // large page commits but WS2003 does not allow reserving large page space
2788 // so we just use 4K pages for reserve, this gives us a legal contiguous
2789 // address space. then we will deallocate that reservation, and re alloc
2790 // using large pages
2791 const size_t size_of_reserve = bytes + chunk_size;
2792 if (bytes > size_of_reserve) {
2793 // Overflowed.
2794 return NULL;
2795 }
2796 p_buf = (char *) VirtualAlloc(addr,
2797 size_of_reserve, // size of Reserve
2798 MEM_RESERVE,
2799 PAGE_READWRITE);
2800 // If reservation failed, return NULL
2801 if (p_buf == NULL) return NULL;
2802
2803 os::release_memory(p_buf, bytes + chunk_size);
2804
2805 // we still need to round up to a page boundary (in case we are using large pages)
2806 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2807 // instead we handle this in the bytes_to_rq computation below
2808 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2809
2810 // now go through and allocate one chunk at a time until all bytes are
2811 // allocated
2812 size_t bytes_remaining = bytes;
2813 // An overflow of align_size_up() would have been caught above
2814 // in the calculation of size_of_reserve.
2815 char * next_alloc_addr = p_buf;
2816 HANDLE hProc = GetCurrentProcess();
2817
2818 #ifdef ASSERT
2819 // Variable for the failure injection
2820 long ran_num = os::random();
2821 size_t fail_after = ran_num % bytes;
2822 #endif
2823
2824 int count=0;
2825 while (bytes_remaining) {
2826 // select bytes_to_rq to get to the next chunk_size boundary
2827
2828 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2829 // Note allocate and commit
2830 char * p_new;
2831
2832 #ifdef ASSERT
2833 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2834 #else
2835 const bool inject_error_now = false;
2836 #endif
2837
2838 if (inject_error_now) {
2839 p_new = NULL;
2840 } else {
2841 if (!UseNUMAInterleaving) {
2842 p_new = (char *) VirtualAlloc(next_alloc_addr,
2843 bytes_to_rq,
2844 flags,
2845 prot);
2846 } else {
2847 // get the next node to use from the used_node_list
2848 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2849 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2850 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2851 next_alloc_addr,
2852 bytes_to_rq,
2853 flags,
2854 prot,
2855 node);
2856 }
2857 }
2858
2859 if (p_new == NULL) {
2860 // Free any allocated pages
2861 if (next_alloc_addr > p_buf) {
2862 // Some memory was committed so release it.
2863 size_t bytes_to_release = bytes - bytes_remaining;
2864 os::release_memory(p_buf, bytes_to_release);
2865 }
2866 #ifdef ASSERT
2867 if (should_inject_error) {
2868 if (TracePageSizes && Verbose) {
2869 tty->print_cr("Reserving pages individually failed.");
2870 }
2871 }
2872 #endif
2873 return NULL;
2874 }
2875 bytes_remaining -= bytes_to_rq;
2876 next_alloc_addr += bytes_to_rq;
2877 count++;
2878 }
2879 // made it this far, success
2880 return p_buf;
2881 }
2882
2883
2884
2885 void os::large_page_init() {
2886 if (!UseLargePages) return;
2887
2888 // print a warning if any large page related flag is specified on command line
2889 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2890 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2891 bool success = false;
2892
2893 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2894 if (resolve_functions_for_large_page_init()) {
2895 if (request_lock_memory_privilege()) {
2896 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2897 if (s) {
2898 #if defined(IA32) || defined(AMD64)
2899 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2900 WARN("JVM cannot use large pages bigger than 4mb.");
2901 } else {
2902 #endif
2903 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2904 _large_page_size = LargePageSizeInBytes;
2905 } else {
2906 _large_page_size = s;
2907 }
2908 success = true;
2909 #if defined(IA32) || defined(AMD64)
2910 }
2911 #endif
2912 } else {
2913 WARN("Large page is not supported by the processor.");
2914 }
2915 } else {
2916 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2917 }
2918 } else {
2919 WARN("Large page is not supported by the operating system.");
2920 }
2921 #undef WARN
2922
2923 const size_t default_page_size = (size_t) vm_page_size();
2924 if (success && _large_page_size > default_page_size) {
2925 _page_sizes[0] = _large_page_size;
2926 _page_sizes[1] = default_page_size;
2927 _page_sizes[2] = 0;
2928 }
2929
2930 cleanup_after_large_page_init();
2931 UseLargePages = success;
2932 }
2933
2934 // On win32, one cannot release just a part of reserved memory, it's an
2935 // all or nothing deal. When we split a reservation, we must break the
2936 // reservation into two reservations.
2937 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2938 bool realloc) {
2939 if (size > 0) {
2940 release_memory(base, size);
2941 if (realloc) {
2942 reserve_memory(split, base);
2943 }
2944 if (size != split) {
2945 reserve_memory(size - split, base + split);
2946 }
2947 }
2948 }
2949
2950 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2951 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2952 "reserve alignment");
2953 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2954 char* res;
2955 // note that if UseLargePages is on, all the areas that require interleaving
2956 // will go thru reserve_memory_special rather than thru here.
2957 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
2958 if (!use_individual) {
2959 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2960 } else {
2961 elapsedTimer reserveTimer;
2962 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
2963 // in numa interleaving, we have to allocate pages individually
2964 // (well really chunks of NUMAInterleaveGranularity size)
2965 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
2966 if (res == NULL) {
2967 warning("NUMA page allocation failed");
2968 }
2969 if( Verbose && PrintMiscellaneous ) {
2970 reserveTimer.stop();
2971 tty->print_cr("reserve_memory of %Ix bytes took %ld ms (%ld ticks)", bytes,
2972 reserveTimer.milliseconds(), reserveTimer.ticks());
2973 }
2974 }
2975 assert(res == NULL || addr == NULL || addr == res,
2976 "Unexpected address from reserve.");
2977
2978 return res;
2979 }
2980
2981 // Reserve memory at an arbitrary address, only if that area is
2982 // available (and not reserved for something else).
2983 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2984 // Windows os::reserve_memory() fails of the requested address range is
2985 // not avilable.
2986 return reserve_memory(bytes, requested_addr);
2987 }
2988
2989 size_t os::large_page_size() {
2990 return _large_page_size;
2991 }
2992
2993 bool os::can_commit_large_page_memory() {
2994 // Windows only uses large page memory when the entire region is reserved
2995 // and committed in a single VirtualAlloc() call. This may change in the
2996 // future, but with Windows 2003 it's not possible to commit on demand.
2997 return false;
2998 }
2999
3000 bool os::can_execute_large_page_memory() {
3001 return true;
3002 }
3003
3004 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3005
3006 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3007 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3008
3009 // with large pages, there are two cases where we need to use Individual Allocation
3010 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3011 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3012 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3013 if (TracePageSizes && Verbose) {
3014 tty->print_cr("Reserving large pages individually.");
3015 }
3016 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3017 if (p_buf == NULL) {
3018 // give an appropriate warning message
3019 if (UseNUMAInterleaving) {
3020 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3021 }
3022 if (UseLargePagesIndividualAllocation) {
3023 warning("Individually allocated large pages failed, "
3024 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3025 }
3026 return NULL;
3027 }
3028
3029 return p_buf;
3030
3031 } else {
3032 // normal policy just allocate it all at once
3033 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3034 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3035 return res;
3036 }
3037 }
3038
3039 bool os::release_memory_special(char* base, size_t bytes) {
3040 return release_memory(base, bytes);
3041 }
3042
3043 void os::print_statistics() {
3044 }
3045
3046 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3047 if (bytes == 0) {
3048 // Don't bother the OS with noops.
3049 return true;
3050 }
3051 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3052 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3053 // Don't attempt to print anything if the OS call fails. We're
3054 // probably low on resources, so the print itself may cause crashes.
3055
3056 // unless we have NUMAInterleaving enabled, the range of a commit
3057 // is always within a reserve covered by a single VirtualAlloc
3058 // in that case we can just do a single commit for the requested size
3059 if (!UseNUMAInterleaving) {
3060 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3061 if (exec) {
3062 DWORD oldprot;
3063 // Windows doc says to use VirtualProtect to get execute permissions
3064 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3065 }
3066 return true;
3067 } else {
3068
3069 // when NUMAInterleaving is enabled, the commit might cover a range that
3070 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3071 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3072 // returns represents the number of bytes that can be committed in one step.
3073 size_t bytes_remaining = bytes;
3074 char * next_alloc_addr = addr;
3075 while (bytes_remaining > 0) {
3076 MEMORY_BASIC_INFORMATION alloc_info;
3077 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3078 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3079 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3080 return false;
3081 if (exec) {
3082 DWORD oldprot;
3083 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3084 return false;
3085 }
3086 bytes_remaining -= bytes_to_rq;
3087 next_alloc_addr += bytes_to_rq;
3088 }
3089 }
3090 // if we made it this far, return true
3091 return true;
3092 }
3093
3094 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3095 bool exec) {
3096 return commit_memory(addr, size, exec);
3097 }
3098
3099 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3100 if (bytes == 0) {
3101 // Don't bother the OS with noops.
3102 return true;
3103 }
3104 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3105 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3106 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3107 }
3108
3109 bool os::pd_release_memory(char* addr, size_t bytes) {
3110 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3111 }
3112
3113 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3114 return os::commit_memory(addr, size);
3115 }
3116
3117 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3118 return os::uncommit_memory(addr, size);
3119 }
3120
3121 // Set protections specified
3122 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3123 bool is_committed) {
3124 unsigned int p = 0;
3125 switch (prot) {
3126 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3127 case MEM_PROT_READ: p = PAGE_READONLY; break;
3128 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3129 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3130 default:
3131 ShouldNotReachHere();
3132 }
3133
3134 DWORD old_status;
3135
3136 // Strange enough, but on Win32 one can change protection only for committed
3137 // memory, not a big deal anyway, as bytes less or equal than 64K
3138 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3139 fatal("cannot commit protection page");
3140 }
3141 // One cannot use os::guard_memory() here, as on Win32 guard page
3142 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3143 //
3144 // Pages in the region become guard pages. Any attempt to access a guard page
3145 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3146 // the guard page status. Guard pages thus act as a one-time access alarm.
3147 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3148 }
3149
3150 bool os::guard_memory(char* addr, size_t bytes) {
3151 DWORD old_status;
3152 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3153 }
3154
3155 bool os::unguard_memory(char* addr, size_t bytes) {
3156 DWORD old_status;
3157 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3158 }
3159
3160 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3161 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3162 void os::numa_make_global(char *addr, size_t bytes) { }
3163 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3164 bool os::numa_topology_changed() { return false; }
3165 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3166 int os::numa_get_group_id() { return 0; }
3167 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3168 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3169 // Provide an answer for UMA systems
3170 ids[0] = 0;
3171 return 1;
3172 } else {
3173 // check for size bigger than actual groups_num
3174 size = MIN2(size, numa_get_groups_num());
3175 for (int i = 0; i < (int)size; i++) {
3176 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3177 }
3178 return size;
3179 }
3180 }
3181
3182 bool os::get_page_info(char *start, page_info* info) {
3183 return false;
3184 }
3185
3186 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3187 return end;
3188 }
3189
3190 char* os::non_memory_address_word() {
3191 // Must never look like an address returned by reserve_memory,
3192 // even in its subfields (as defined by the CPU immediate fields,
3193 // if the CPU splits constants across multiple instructions).
3194 return (char*)-1;
3195 }
3196
3197 #define MAX_ERROR_COUNT 100
3198 #define SYS_THREAD_ERROR 0xffffffffUL
3199
3200 void os::pd_start_thread(Thread* thread) {
3201 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3202 // Returns previous suspend state:
3203 // 0: Thread was not suspended
3204 // 1: Thread is running now
3205 // >1: Thread is still suspended.
3206 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3207 }
3208
3209 class HighResolutionInterval {
3210 // The default timer resolution seems to be 10 milliseconds.
3211 // (Where is this written down?)
3212 // If someone wants to sleep for only a fraction of the default,
3213 // then we set the timer resolution down to 1 millisecond for
3214 // the duration of their interval.
3215 // We carefully set the resolution back, since otherwise we
3216 // seem to incur an overhead (3%?) that we don't need.
3217 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3218 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3219 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3220 // timeBeginPeriod() if the relative error exceeded some threshold.
3221 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3222 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3223 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3224 // resolution timers running.
3225 private:
3226 jlong resolution;
3227 public:
3228 HighResolutionInterval(jlong ms) {
3229 resolution = ms % 10L;
3230 if (resolution != 0) {
3231 MMRESULT result = timeBeginPeriod(1L);
3232 }
3233 }
3234 ~HighResolutionInterval() {
3235 if (resolution != 0) {
3236 MMRESULT result = timeEndPeriod(1L);
3237 }
3238 resolution = 0L;
3239 }
3240 };
3241
3242 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3243 jlong limit = (jlong) MAXDWORD;
3244
3245 while(ms > limit) {
3246 int res;
3247 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3248 return res;
3249 ms -= limit;
3250 }
3251
3252 assert(thread == Thread::current(), "thread consistency check");
3253 OSThread* osthread = thread->osthread();
3254 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3255 int result;
3256 if (interruptable) {
3257 assert(thread->is_Java_thread(), "must be java thread");
3258 JavaThread *jt = (JavaThread *) thread;
3259 ThreadBlockInVM tbivm(jt);
3260
3261 jt->set_suspend_equivalent();
3262 // cleared by handle_special_suspend_equivalent_condition() or
3263 // java_suspend_self() via check_and_wait_while_suspended()
3264
3265 HANDLE events[1];
3266 events[0] = osthread->interrupt_event();
3267 HighResolutionInterval *phri=NULL;
3268 if(!ForceTimeHighResolution)
3269 phri = new HighResolutionInterval( ms );
3270 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3271 result = OS_TIMEOUT;
3272 } else {
3273 ResetEvent(osthread->interrupt_event());
3274 osthread->set_interrupted(false);
3275 result = OS_INTRPT;
3276 }
3277 delete phri; //if it is NULL, harmless
3278
3279 // were we externally suspended while we were waiting?
3280 jt->check_and_wait_while_suspended();
3281 } else {
3282 assert(!thread->is_Java_thread(), "must not be java thread");
3283 Sleep((long) ms);
3284 result = OS_TIMEOUT;
3285 }
3286 return result;
3287 }
3288
3289 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3290 void os::infinite_sleep() {
3291 while (true) { // sleep forever ...
3292 Sleep(100000); // ... 100 seconds at a time
3293 }
3294 }
3295
3296 typedef BOOL (WINAPI * STTSignature)(void) ;
3297
3298 os::YieldResult os::NakedYield() {
3299 // Use either SwitchToThread() or Sleep(0)
3300 // Consider passing back the return value from SwitchToThread().
3301 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3302 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3303 } else {
3304 Sleep(0);
3305 }
3306 return os::YIELD_UNKNOWN ;
3307 }
3308
3309 void os::yield() { os::NakedYield(); }
3310
3311 void os::yield_all(int attempts) {
3312 // Yields to all threads, including threads with lower priorities
3313 Sleep(1);
3314 }
3315
3316 // Win32 only gives you access to seven real priorities at a time,
3317 // so we compress Java's ten down to seven. It would be better
3318 // if we dynamically adjusted relative priorities.
3319
3320 int os::java_to_os_priority[CriticalPriority + 1] = {
3321 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3322 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3323 THREAD_PRIORITY_LOWEST, // 2
3324 THREAD_PRIORITY_BELOW_NORMAL, // 3
3325 THREAD_PRIORITY_BELOW_NORMAL, // 4
3326 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3327 THREAD_PRIORITY_NORMAL, // 6
3328 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3329 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3330 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3331 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3332 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3333 };
3334
3335 int prio_policy1[CriticalPriority + 1] = {
3336 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3337 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3338 THREAD_PRIORITY_LOWEST, // 2
3339 THREAD_PRIORITY_BELOW_NORMAL, // 3
3340 THREAD_PRIORITY_BELOW_NORMAL, // 4
3341 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3342 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3343 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3344 THREAD_PRIORITY_HIGHEST, // 8
3345 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3346 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3347 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3348 };
3349
3350 static int prio_init() {
3351 // If ThreadPriorityPolicy is 1, switch tables
3352 if (ThreadPriorityPolicy == 1) {
3353 int i;
3354 for (i = 0; i < CriticalPriority + 1; i++) {
3355 os::java_to_os_priority[i] = prio_policy1[i];
3356 }
3357 }
3358 if (UseCriticalJavaThreadPriority) {
3359 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3360 }
3361 return 0;
3362 }
3363
3364 OSReturn os::set_native_priority(Thread* thread, int priority) {
3365 if (!UseThreadPriorities) return OS_OK;
3366 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3367 return ret ? OS_OK : OS_ERR;
3368 }
3369
3370 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3371 if ( !UseThreadPriorities ) {
3372 *priority_ptr = java_to_os_priority[NormPriority];
3373 return OS_OK;
3374 }
3375 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3376 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3377 assert(false, "GetThreadPriority failed");
3378 return OS_ERR;
3379 }
3380 *priority_ptr = os_prio;
3381 return OS_OK;
3382 }
3383
3384
3385 // Hint to the underlying OS that a task switch would not be good.
3386 // Void return because it's a hint and can fail.
3387 void os::hint_no_preempt() {}
3388
3389 void os::interrupt(Thread* thread) {
3390 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3391 "possibility of dangling Thread pointer");
3392
3393 OSThread* osthread = thread->osthread();
3394 osthread->set_interrupted(true);
3395 // More than one thread can get here with the same value of osthread,
3396 // resulting in multiple notifications. We do, however, want the store
3397 // to interrupted() to be visible to other threads before we post
3398 // the interrupt event.
3399 OrderAccess::release();
3400 SetEvent(osthread->interrupt_event());
3401 // For JSR166: unpark after setting status
3402 if (thread->is_Java_thread())
3403 ((JavaThread*)thread)->parker()->unpark();
3404
3405 ParkEvent * ev = thread->_ParkEvent ;
3406 if (ev != NULL) ev->unpark() ;
3407
3408 }
3409
3410
3411 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3412 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3413 "possibility of dangling Thread pointer");
3414
3415 OSThread* osthread = thread->osthread();
3416 bool interrupted = osthread->interrupted();
3417 // There is no synchronization between the setting of the interrupt
3418 // and it being cleared here. It is critical - see 6535709 - that
3419 // we only clear the interrupt state, and reset the interrupt event,
3420 // if we are going to report that we were indeed interrupted - else
3421 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3422 // depending on the timing
3423 if (interrupted && clear_interrupted) {
3424 osthread->set_interrupted(false);
3425 ResetEvent(osthread->interrupt_event());
3426 } // Otherwise leave the interrupted state alone
3427
3428 return interrupted;
3429 }
3430
3431 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3432 ExtendedPC os::get_thread_pc(Thread* thread) {
3433 CONTEXT context;
3434 context.ContextFlags = CONTEXT_CONTROL;
3435 HANDLE handle = thread->osthread()->thread_handle();
3436 #ifdef _M_IA64
3437 assert(0, "Fix get_thread_pc");
3438 return ExtendedPC(NULL);
3439 #else
3440 if (GetThreadContext(handle, &context)) {
3441 #ifdef _M_AMD64
3442 return ExtendedPC((address) context.Rip);
3443 #else
3444 return ExtendedPC((address) context.Eip);
3445 #endif
3446 } else {
3447 return ExtendedPC(NULL);
3448 }
3449 #endif
3450 }
3451
3452 // GetCurrentThreadId() returns DWORD
3453 intx os::current_thread_id() { return GetCurrentThreadId(); }
3454
3455 static int _initial_pid = 0;
3456
3457 int os::current_process_id()
3458 {
3459 return (_initial_pid ? _initial_pid : _getpid());
3460 }
3461
3462 int os::win32::_vm_page_size = 0;
3463 int os::win32::_vm_allocation_granularity = 0;
3464 int os::win32::_processor_type = 0;
3465 // Processor level is not available on non-NT systems, use vm_version instead
3466 int os::win32::_processor_level = 0;
3467 julong os::win32::_physical_memory = 0;
3468 size_t os::win32::_default_stack_size = 0;
3469
3470 intx os::win32::_os_thread_limit = 0;
3471 volatile intx os::win32::_os_thread_count = 0;
3472
3473 bool os::win32::_is_nt = false;
3474 bool os::win32::_is_windows_2003 = false;
3475 bool os::win32::_is_windows_server = false;
3476
3477 void os::win32::initialize_system_info() {
3478 SYSTEM_INFO si;
3479 GetSystemInfo(&si);
3480 _vm_page_size = si.dwPageSize;
3481 _vm_allocation_granularity = si.dwAllocationGranularity;
3482 _processor_type = si.dwProcessorType;
3483 _processor_level = si.wProcessorLevel;
3484 set_processor_count(si.dwNumberOfProcessors);
3485
3486 MEMORYSTATUSEX ms;
3487 ms.dwLength = sizeof(ms);
3488
3489 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3490 // dwMemoryLoad (% of memory in use)
3491 GlobalMemoryStatusEx(&ms);
3492 _physical_memory = ms.ullTotalPhys;
3493
3494 OSVERSIONINFOEX oi;
3495 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3496 GetVersionEx((OSVERSIONINFO*)&oi);
3497 switch(oi.dwPlatformId) {
3498 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3499 case VER_PLATFORM_WIN32_NT:
3500 _is_nt = true;
3501 {
3502 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3503 if (os_vers == 5002) {
3504 _is_windows_2003 = true;
3505 }
3506 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3507 oi.wProductType == VER_NT_SERVER) {
3508 _is_windows_server = true;
3509 }
3510 }
3511 break;
3512 default: fatal("Unknown platform");
3513 }
3514
3515 _default_stack_size = os::current_stack_size();
3516 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3517 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3518 "stack size not a multiple of page size");
3519
3520 initialize_performance_counter();
3521
3522 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3523 // known to deadlock the system, if the VM issues to thread operations with
3524 // a too high frequency, e.g., such as changing the priorities.
3525 // The 6000 seems to work well - no deadlocks has been notices on the test
3526 // programs that we have seen experience this problem.
3527 if (!os::win32::is_nt()) {
3528 StarvationMonitorInterval = 6000;
3529 }
3530 }
3531
3532
3533 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3534 char path[MAX_PATH];
3535 DWORD size;
3536 DWORD pathLen = (DWORD)sizeof(path);
3537 HINSTANCE result = NULL;
3538
3539 // only allow library name without path component
3540 assert(strchr(name, '\\') == NULL, "path not allowed");
3541 assert(strchr(name, ':') == NULL, "path not allowed");
3542 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3543 jio_snprintf(ebuf, ebuflen,
3544 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3545 return NULL;
3546 }
3547
3548 // search system directory
3549 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3550 strcat(path, "\\");
3551 strcat(path, name);
3552 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3553 return result;
3554 }
3555 }
3556
3557 // try Windows directory
3558 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3559 strcat(path, "\\");
3560 strcat(path, name);
3561 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3562 return result;
3563 }
3564 }
3565
3566 jio_snprintf(ebuf, ebuflen,
3567 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3568 return NULL;
3569 }
3570
3571 void os::win32::setmode_streams() {
3572 _setmode(_fileno(stdin), _O_BINARY);
3573 _setmode(_fileno(stdout), _O_BINARY);
3574 _setmode(_fileno(stderr), _O_BINARY);
3575 }
3576
3577
3578 bool os::is_debugger_attached() {
3579 return IsDebuggerPresent() ? true : false;
3580 }
3581
3582
3583 void os::wait_for_keypress_at_exit(void) {
3584 if (PauseAtExit) {
3585 fprintf(stderr, "Press any key to continue...\n");
3586 fgetc(stdin);
3587 }
3588 }
3589
3590
3591 int os::message_box(const char* title, const char* message) {
3592 int result = MessageBox(NULL, message, title,
3593 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3594 return result == IDYES;
3595 }
3596
3597 int os::allocate_thread_local_storage() {
3598 return TlsAlloc();
3599 }
3600
3601
3602 void os::free_thread_local_storage(int index) {
3603 TlsFree(index);
3604 }
3605
3606
3607 void os::thread_local_storage_at_put(int index, void* value) {
3608 TlsSetValue(index, value);
3609 assert(thread_local_storage_at(index) == value, "Just checking");
3610 }
3611
3612
3613 void* os::thread_local_storage_at(int index) {
3614 return TlsGetValue(index);
3615 }
3616
3617
3618 #ifndef PRODUCT
3619 #ifndef _WIN64
3620 // Helpers to check whether NX protection is enabled
3621 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3622 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3623 pex->ExceptionRecord->NumberParameters > 0 &&
3624 pex->ExceptionRecord->ExceptionInformation[0] ==
3625 EXCEPTION_INFO_EXEC_VIOLATION) {
3626 return EXCEPTION_EXECUTE_HANDLER;
3627 }
3628 return EXCEPTION_CONTINUE_SEARCH;
3629 }
3630
3631 void nx_check_protection() {
3632 // If NX is enabled we'll get an exception calling into code on the stack
3633 char code[] = { (char)0xC3 }; // ret
3634 void *code_ptr = (void *)code;
3635 __try {
3636 __asm call code_ptr
3637 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3638 tty->print_raw_cr("NX protection detected.");
3639 }
3640 }
3641 #endif // _WIN64
3642 #endif // PRODUCT
3643
3644 // this is called _before_ the global arguments have been parsed
3645 void os::init(void) {
3646 _initial_pid = _getpid();
3647
3648 init_random(1234567);
3649
3650 win32::initialize_system_info();
3651 win32::setmode_streams();
3652 init_page_sizes((size_t) win32::vm_page_size());
3653
3654 // For better scalability on MP systems (must be called after initialize_system_info)
3655 #ifndef PRODUCT
3656 if (is_MP()) {
3657 NoYieldsInMicrolock = true;
3658 }
3659 #endif
3660 // This may be overridden later when argument processing is done.
3661 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3662 os::win32::is_windows_2003());
3663
3664 // Initialize main_process and main_thread
3665 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3666 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3667 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3668 fatal("DuplicateHandle failed\n");
3669 }
3670 main_thread_id = (int) GetCurrentThreadId();
3671 }
3672
3673 // To install functions for atexit processing
3674 extern "C" {
3675 static void perfMemory_exit_helper() {
3676 perfMemory_exit();
3677 }
3678 }
3679
3680 // this is called _after_ the global arguments have been parsed
3681 jint os::init_2(void) {
3682 // Allocate a single page and mark it as readable for safepoint polling
3683 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3684 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3685
3686 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3687 guarantee( return_page != NULL, "Commit Failed for polling page");
3688
3689 os::set_polling_page( polling_page );
3690
3691 #ifndef PRODUCT
3692 if( Verbose && PrintMiscellaneous )
3693 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3694 #endif
3695
3696 if (!UseMembar) {
3697 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3698 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3699
3700 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3701 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3702
3703 os::set_memory_serialize_page( mem_serialize_page );
3704
3705 #ifndef PRODUCT
3706 if(Verbose && PrintMiscellaneous)
3707 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3708 #endif
3709 }
3710
3711 os::large_page_init();
3712
3713 // Setup Windows Exceptions
3714
3715 // On Itanium systems, Structured Exception Handling does not
3716 // work since stack frames must be walkable by the OS. Since
3717 // much of our code is dynamically generated, and we do not have
3718 // proper unwind .xdata sections, the system simply exits
3719 // rather than delivering the exception. To work around
3720 // this we use VectorExceptions instead.
3721 #ifdef _WIN64
3722 if (UseVectoredExceptions) {
3723 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3724 }
3725 #endif
3726
3727 // for debugging float code generation bugs
3728 if (ForceFloatExceptions) {
3729 #ifndef _WIN64
3730 static long fp_control_word = 0;
3731 __asm { fstcw fp_control_word }
3732 // see Intel PPro Manual, Vol. 2, p 7-16
3733 const long precision = 0x20;
3734 const long underflow = 0x10;
3735 const long overflow = 0x08;
3736 const long zero_div = 0x04;
3737 const long denorm = 0x02;
3738 const long invalid = 0x01;
3739 fp_control_word |= invalid;
3740 __asm { fldcw fp_control_word }
3741 #endif
3742 }
3743
3744 // If stack_commit_size is 0, windows will reserve the default size,
3745 // but only commit a small portion of it.
3746 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3747 size_t default_reserve_size = os::win32::default_stack_size();
3748 size_t actual_reserve_size = stack_commit_size;
3749 if (stack_commit_size < default_reserve_size) {
3750 // If stack_commit_size == 0, we want this too
3751 actual_reserve_size = default_reserve_size;
3752 }
3753
3754 // Check minimum allowable stack size for thread creation and to initialize
3755 // the java system classes, including StackOverflowError - depends on page
3756 // size. Add a page for compiler2 recursion in main thread.
3757 // Add in 2*BytesPerWord times page size to account for VM stack during
3758 // class initialization depending on 32 or 64 bit VM.
3759 size_t min_stack_allowed =
3760 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3761 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3762 if (actual_reserve_size < min_stack_allowed) {
3763 tty->print_cr("\nThe stack size specified is too small, "
3764 "Specify at least %dk",
3765 min_stack_allowed / K);
3766 return JNI_ERR;
3767 }
3768
3769 JavaThread::set_stack_size_at_create(stack_commit_size);
3770
3771 // Calculate theoretical max. size of Threads to guard gainst artifical
3772 // out-of-memory situations, where all available address-space has been
3773 // reserved by thread stacks.
3774 assert(actual_reserve_size != 0, "Must have a stack");
3775
3776 // Calculate the thread limit when we should start doing Virtual Memory
3777 // banging. Currently when the threads will have used all but 200Mb of space.
3778 //
3779 // TODO: consider performing a similar calculation for commit size instead
3780 // as reserve size, since on a 64-bit platform we'll run into that more
3781 // often than running out of virtual memory space. We can use the
3782 // lower value of the two calculations as the os_thread_limit.
3783 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3784 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3785
3786 // at exit methods are called in the reverse order of their registration.
3787 // there is no limit to the number of functions registered. atexit does
3788 // not set errno.
3789
3790 if (PerfAllowAtExitRegistration) {
3791 // only register atexit functions if PerfAllowAtExitRegistration is set.
3792 // atexit functions can be delayed until process exit time, which
3793 // can be problematic for embedded VM situations. Embedded VMs should
3794 // call DestroyJavaVM() to assure that VM resources are released.
3795
3796 // note: perfMemory_exit_helper atexit function may be removed in
3797 // the future if the appropriate cleanup code can be added to the
3798 // VM_Exit VMOperation's doit method.
3799 if (atexit(perfMemory_exit_helper) != 0) {
3800 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3801 }
3802 }
3803
3804 #ifndef _WIN64
3805 // Print something if NX is enabled (win32 on AMD64)
3806 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3807 #endif
3808
3809 // initialize thread priority policy
3810 prio_init();
3811
3812 if (UseNUMA && !ForceNUMA) {
3813 UseNUMA = false; // We don't fully support this yet
3814 }
3815
3816 if (UseNUMAInterleaving) {
3817 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3818 bool success = numa_interleaving_init();
3819 if (!success) UseNUMAInterleaving = false;
3820 }
3821
3822 return JNI_OK;
3823 }
3824
3825 void os::init_3(void) {
3826 return;
3827 }
3828
3829 // Mark the polling page as unreadable
3830 void os::make_polling_page_unreadable(void) {
3831 DWORD old_status;
3832 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3833 fatal("Could not disable polling page");
3834 };
3835
3836 // Mark the polling page as readable
3837 void os::make_polling_page_readable(void) {
3838 DWORD old_status;
3839 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3840 fatal("Could not enable polling page");
3841 };
3842
3843
3844 int os::stat(const char *path, struct stat *sbuf) {
3845 char pathbuf[MAX_PATH];
3846 if (strlen(path) > MAX_PATH - 1) {
3847 errno = ENAMETOOLONG;
3848 return -1;
3849 }
3850 os::native_path(strcpy(pathbuf, path));
3851 int ret = ::stat(pathbuf, sbuf);
3852 if (sbuf != NULL && UseUTCFileTimestamp) {
3853 // Fix for 6539723. st_mtime returned from stat() is dependent on
3854 // the system timezone and so can return different values for the
3855 // same file if/when daylight savings time changes. This adjustment
3856 // makes sure the same timestamp is returned regardless of the TZ.
3857 //
3858 // See:
3859 // http://msdn.microsoft.com/library/
3860 // default.asp?url=/library/en-us/sysinfo/base/
3861 // time_zone_information_str.asp
3862 // and
3863 // http://msdn.microsoft.com/library/default.asp?url=
3864 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3865 //
3866 // NOTE: there is a insidious bug here: If the timezone is changed
3867 // after the call to stat() but before 'GetTimeZoneInformation()', then
3868 // the adjustment we do here will be wrong and we'll return the wrong
3869 // value (which will likely end up creating an invalid class data
3870 // archive). Absent a better API for this, or some time zone locking
3871 // mechanism, we'll have to live with this risk.
3872 TIME_ZONE_INFORMATION tz;
3873 DWORD tzid = GetTimeZoneInformation(&tz);
3874 int daylightBias =
3875 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3876 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3877 }
3878 return ret;
3879 }
3880
3881
3882 #define FT2INT64(ft) \
3883 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3884
3885
3886 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3887 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3888 // of a thread.
3889 //
3890 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3891 // the fast estimate available on the platform.
3892
3893 // current_thread_cpu_time() is not optimized for Windows yet
3894 jlong os::current_thread_cpu_time() {
3895 // return user + sys since the cost is the same
3896 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3897 }
3898
3899 jlong os::thread_cpu_time(Thread* thread) {
3900 // consistent with what current_thread_cpu_time() returns.
3901 return os::thread_cpu_time(thread, true /* user+sys */);
3902 }
3903
3904 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3905 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3906 }
3907
3908 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3909 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3910 // If this function changes, os::is_thread_cpu_time_supported() should too
3911 if (os::win32::is_nt()) {
3912 FILETIME CreationTime;
3913 FILETIME ExitTime;
3914 FILETIME KernelTime;
3915 FILETIME UserTime;
3916
3917 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3918 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3919 return -1;
3920 else
3921 if (user_sys_cpu_time) {
3922 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3923 } else {
3924 return FT2INT64(UserTime) * 100;
3925 }
3926 } else {
3927 return (jlong) timeGetTime() * 1000000;
3928 }
3929 }
3930
3931 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3932 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3933 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3934 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3935 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3936 }
3937
3938 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3939 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3940 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3941 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3942 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3943 }
3944
3945 bool os::is_thread_cpu_time_supported() {
3946 // see os::thread_cpu_time
3947 if (os::win32::is_nt()) {
3948 FILETIME CreationTime;
3949 FILETIME ExitTime;
3950 FILETIME KernelTime;
3951 FILETIME UserTime;
3952
3953 if ( GetThreadTimes(GetCurrentThread(),
3954 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3955 return false;
3956 else
3957 return true;
3958 } else {
3959 return false;
3960 }
3961 }
3962
3963 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3964 // It does have primitives (PDH API) to get CPU usage and run queue length.
3965 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3966 // If we wanted to implement loadavg on Windows, we have a few options:
3967 //
3968 // a) Query CPU usage and run queue length and "fake" an answer by
3969 // returning the CPU usage if it's under 100%, and the run queue
3970 // length otherwise. It turns out that querying is pretty slow
3971 // on Windows, on the order of 200 microseconds on a fast machine.
3972 // Note that on the Windows the CPU usage value is the % usage
3973 // since the last time the API was called (and the first call
3974 // returns 100%), so we'd have to deal with that as well.
3975 //
3976 // b) Sample the "fake" answer using a sampling thread and store
3977 // the answer in a global variable. The call to loadavg would
3978 // just return the value of the global, avoiding the slow query.
3979 //
3980 // c) Sample a better answer using exponential decay to smooth the
3981 // value. This is basically the algorithm used by UNIX kernels.
3982 //
3983 // Note that sampling thread starvation could affect both (b) and (c).
3984 int os::loadavg(double loadavg[], int nelem) {
3985 return -1;
3986 }
3987
3988
3989 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3990 bool os::dont_yield() {
3991 return DontYieldALot;
3992 }
3993
3994 // This method is a slightly reworked copy of JDK's sysOpen
3995 // from src/windows/hpi/src/sys_api_md.c
3996
3997 int os::open(const char *path, int oflag, int mode) {
3998 char pathbuf[MAX_PATH];
3999
4000 if (strlen(path) > MAX_PATH - 1) {
4001 errno = ENAMETOOLONG;
4002 return -1;
4003 }
4004 os::native_path(strcpy(pathbuf, path));
4005 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4006 }
4007
4008 // Is a (classpath) directory empty?
4009 bool os::dir_is_empty(const char* path) {
4010 WIN32_FIND_DATA fd;
4011 HANDLE f = FindFirstFile(path, &fd);
4012 if (f == INVALID_HANDLE_VALUE) {
4013 return true;
4014 }
4015 FindClose(f);
4016 return false;
4017 }
4018
4019 // create binary file, rewriting existing file if required
4020 int os::create_binary_file(const char* path, bool rewrite_existing) {
4021 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4022 if (!rewrite_existing) {
4023 oflags |= _O_EXCL;
4024 }
4025 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4026 }
4027
4028 // return current position of file pointer
4029 jlong os::current_file_offset(int fd) {
4030 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4031 }
4032
4033 // move file pointer to the specified offset
4034 jlong os::seek_to_file_offset(int fd, jlong offset) {
4035 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4036 }
4037
4038
4039 jlong os::lseek(int fd, jlong offset, int whence) {
4040 return (jlong) ::_lseeki64(fd, offset, whence);
4041 }
4042
4043 // This method is a slightly reworked copy of JDK's sysNativePath
4044 // from src/windows/hpi/src/path_md.c
4045
4046 /* Convert a pathname to native format. On win32, this involves forcing all
4047 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4048 sometimes rejects '/') and removing redundant separators. The input path is
4049 assumed to have been converted into the character encoding used by the local
4050 system. Because this might be a double-byte encoding, care is taken to
4051 treat double-byte lead characters correctly.
4052
4053 This procedure modifies the given path in place, as the result is never
4054 longer than the original. There is no error return; this operation always
4055 succeeds. */
4056 char * os::native_path(char *path) {
4057 char *src = path, *dst = path, *end = path;
4058 char *colon = NULL; /* If a drive specifier is found, this will
4059 point to the colon following the drive
4060 letter */
4061
4062 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4063 assert(((!::IsDBCSLeadByte('/'))
4064 && (!::IsDBCSLeadByte('\\'))
4065 && (!::IsDBCSLeadByte(':'))),
4066 "Illegal lead byte");
4067
4068 /* Check for leading separators */
4069 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4070 while (isfilesep(*src)) {
4071 src++;
4072 }
4073
4074 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4075 /* Remove leading separators if followed by drive specifier. This
4076 hack is necessary to support file URLs containing drive
4077 specifiers (e.g., "file://c:/path"). As a side effect,
4078 "/c:/path" can be used as an alternative to "c:/path". */
4079 *dst++ = *src++;
4080 colon = dst;
4081 *dst++ = ':';
4082 src++;
4083 } else {
4084 src = path;
4085 if (isfilesep(src[0]) && isfilesep(src[1])) {
4086 /* UNC pathname: Retain first separator; leave src pointed at
4087 second separator so that further separators will be collapsed
4088 into the second separator. The result will be a pathname
4089 beginning with "\\\\" followed (most likely) by a host name. */
4090 src = dst = path + 1;
4091 path[0] = '\\'; /* Force first separator to '\\' */
4092 }
4093 }
4094
4095 end = dst;
4096
4097 /* Remove redundant separators from remainder of path, forcing all
4098 separators to be '\\' rather than '/'. Also, single byte space
4099 characters are removed from the end of the path because those
4100 are not legal ending characters on this operating system.
4101 */
4102 while (*src != '\0') {
4103 if (isfilesep(*src)) {
4104 *dst++ = '\\'; src++;
4105 while (isfilesep(*src)) src++;
4106 if (*src == '\0') {
4107 /* Check for trailing separator */
4108 end = dst;
4109 if (colon == dst - 2) break; /* "z:\\" */
4110 if (dst == path + 1) break; /* "\\" */
4111 if (dst == path + 2 && isfilesep(path[0])) {
4112 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4113 beginning of a UNC pathname. Even though it is not, by
4114 itself, a valid UNC pathname, we leave it as is in order
4115 to be consistent with the path canonicalizer as well
4116 as the win32 APIs, which treat this case as an invalid
4117 UNC pathname rather than as an alias for the root
4118 directory of the current drive. */
4119 break;
4120 }
4121 end = --dst; /* Path does not denote a root directory, so
4122 remove trailing separator */
4123 break;
4124 }
4125 end = dst;
4126 } else {
4127 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4128 *dst++ = *src++;
4129 if (*src) *dst++ = *src++;
4130 end = dst;
4131 } else { /* Copy a single-byte character */
4132 char c = *src++;
4133 *dst++ = c;
4134 /* Space is not a legal ending character */
4135 if (c != ' ') end = dst;
4136 }
4137 }
4138 }
4139
4140 *end = '\0';
4141
4142 /* For "z:", add "." to work around a bug in the C runtime library */
4143 if (colon == dst - 1) {
4144 path[2] = '.';
4145 path[3] = '\0';
4146 }
4147
4148 #ifdef DEBUG
4149 jio_fprintf(stderr, "sysNativePath: %s\n", path);
4150 #endif DEBUG
4151 return path;
4152 }
4153
4154 // This code is a copy of JDK's sysSetLength
4155 // from src/windows/hpi/src/sys_api_md.c
4156
4157 int os::ftruncate(int fd, jlong length) {
4158 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4159 long high = (long)(length >> 32);
4160 DWORD ret;
4161
4162 if (h == (HANDLE)(-1)) {
4163 return -1;
4164 }
4165
4166 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4167 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4168 return -1;
4169 }
4170
4171 if (::SetEndOfFile(h) == FALSE) {
4172 return -1;
4173 }
4174
4175 return 0;
4176 }
4177
4178
4179 // This code is a copy of JDK's sysSync
4180 // from src/windows/hpi/src/sys_api_md.c
4181 // except for the legacy workaround for a bug in Win 98
4182
4183 int os::fsync(int fd) {
4184 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4185
4186 if ( (!::FlushFileBuffers(handle)) &&
4187 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4188 /* from winerror.h */
4189 return -1;
4190 }
4191 return 0;
4192 }
4193
4194 static int nonSeekAvailable(int, long *);
4195 static int stdinAvailable(int, long *);
4196
4197 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4198 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4199
4200 // This code is a copy of JDK's sysAvailable
4201 // from src/windows/hpi/src/sys_api_md.c
4202
4203 int os::available(int fd, jlong *bytes) {
4204 jlong cur, end;
4205 struct _stati64 stbuf64;
4206
4207 if (::_fstati64(fd, &stbuf64) >= 0) {
4208 int mode = stbuf64.st_mode;
4209 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4210 int ret;
4211 long lpbytes;
4212 if (fd == 0) {
4213 ret = stdinAvailable(fd, &lpbytes);
4214 } else {
4215 ret = nonSeekAvailable(fd, &lpbytes);
4216 }
4217 (*bytes) = (jlong)(lpbytes);
4218 return ret;
4219 }
4220 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4221 return FALSE;
4222 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4223 return FALSE;
4224 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4225 return FALSE;
4226 }
4227 *bytes = end - cur;
4228 return TRUE;
4229 } else {
4230 return FALSE;
4231 }
4232 }
4233
4234 // This code is a copy of JDK's nonSeekAvailable
4235 // from src/windows/hpi/src/sys_api_md.c
4236
4237 static int nonSeekAvailable(int fd, long *pbytes) {
4238 /* This is used for available on non-seekable devices
4239 * (like both named and anonymous pipes, such as pipes
4240 * connected to an exec'd process).
4241 * Standard Input is a special case.
4242 *
4243 */
4244 HANDLE han;
4245
4246 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4247 return FALSE;
4248 }
4249
4250 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4251 /* PeekNamedPipe fails when at EOF. In that case we
4252 * simply make *pbytes = 0 which is consistent with the
4253 * behavior we get on Solaris when an fd is at EOF.
4254 * The only alternative is to raise an Exception,
4255 * which isn't really warranted.
4256 */
4257 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4258 return FALSE;
4259 }
4260 *pbytes = 0;
4261 }
4262 return TRUE;
4263 }
4264
4265 #define MAX_INPUT_EVENTS 2000
4266
4267 // This code is a copy of JDK's stdinAvailable
4268 // from src/windows/hpi/src/sys_api_md.c
4269
4270 static int stdinAvailable(int fd, long *pbytes) {
4271 HANDLE han;
4272 DWORD numEventsRead = 0; /* Number of events read from buffer */
4273 DWORD numEvents = 0; /* Number of events in buffer */
4274 DWORD i = 0; /* Loop index */
4275 DWORD curLength = 0; /* Position marker */
4276 DWORD actualLength = 0; /* Number of bytes readable */
4277 BOOL error = FALSE; /* Error holder */
4278 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4279
4280 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4281 return FALSE;
4282 }
4283
4284 /* Construct an array of input records in the console buffer */
4285 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4286 if (error == 0) {
4287 return nonSeekAvailable(fd, pbytes);
4288 }
4289
4290 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4291 if (numEvents > MAX_INPUT_EVENTS) {
4292 numEvents = MAX_INPUT_EVENTS;
4293 }
4294
4295 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4296 if (lpBuffer == NULL) {
4297 return FALSE;
4298 }
4299
4300 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4301 if (error == 0) {
4302 os::free(lpBuffer, mtInternal);
4303 return FALSE;
4304 }
4305
4306 /* Examine input records for the number of bytes available */
4307 for(i=0; i<numEvents; i++) {
4308 if (lpBuffer[i].EventType == KEY_EVENT) {
4309
4310 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4311 &(lpBuffer[i].Event);
4312 if (keyRecord->bKeyDown == TRUE) {
4313 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4314 curLength++;
4315 if (*keyPressed == '\r') {
4316 actualLength = curLength;
4317 }
4318 }
4319 }
4320 }
4321
4322 if(lpBuffer != NULL) {
4323 os::free(lpBuffer, mtInternal);
4324 }
4325
4326 *pbytes = (long) actualLength;
4327 return TRUE;
4328 }
4329
4330 // Map a block of memory.
4331 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4332 char *addr, size_t bytes, bool read_only,
4333 bool allow_exec) {
4334 HANDLE hFile;
4335 char* base;
4336
4337 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4338 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4339 if (hFile == NULL) {
4340 if (PrintMiscellaneous && Verbose) {
4341 DWORD err = GetLastError();
4342 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
4343 }
4344 return NULL;
4345 }
4346
4347 if (allow_exec) {
4348 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4349 // unless it comes from a PE image (which the shared archive is not.)
4350 // Even VirtualProtect refuses to give execute access to mapped memory
4351 // that was not previously executable.
4352 //
4353 // Instead, stick the executable region in anonymous memory. Yuck.
4354 // Penalty is that ~4 pages will not be shareable - in the future
4355 // we might consider DLLizing the shared archive with a proper PE
4356 // header so that mapping executable + sharing is possible.
4357
4358 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4359 PAGE_READWRITE);
4360 if (base == NULL) {
4361 if (PrintMiscellaneous && Verbose) {
4362 DWORD err = GetLastError();
4363 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4364 }
4365 CloseHandle(hFile);
4366 return NULL;
4367 }
4368
4369 DWORD bytes_read;
4370 OVERLAPPED overlapped;
4371 overlapped.Offset = (DWORD)file_offset;
4372 overlapped.OffsetHigh = 0;
4373 overlapped.hEvent = NULL;
4374 // ReadFile guarantees that if the return value is true, the requested
4375 // number of bytes were read before returning.
4376 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4377 if (!res) {
4378 if (PrintMiscellaneous && Verbose) {
4379 DWORD err = GetLastError();
4380 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4381 }
4382 release_memory(base, bytes);
4383 CloseHandle(hFile);
4384 return NULL;
4385 }
4386 } else {
4387 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4388 NULL /*file_name*/);
4389 if (hMap == NULL) {
4390 if (PrintMiscellaneous && Verbose) {
4391 DWORD err = GetLastError();
4392 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
4393 }
4394 CloseHandle(hFile);
4395 return NULL;
4396 }
4397
4398 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4399 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4400 (DWORD)bytes, addr);
4401 if (base == NULL) {
4402 if (PrintMiscellaneous && Verbose) {
4403 DWORD err = GetLastError();
4404 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4405 }
4406 CloseHandle(hMap);
4407 CloseHandle(hFile);
4408 return NULL;
4409 }
4410
4411 if (CloseHandle(hMap) == 0) {
4412 if (PrintMiscellaneous && Verbose) {
4413 DWORD err = GetLastError();
4414 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4415 }
4416 CloseHandle(hFile);
4417 return base;
4418 }
4419 }
4420
4421 if (allow_exec) {
4422 DWORD old_protect;
4423 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4424 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4425
4426 if (!res) {
4427 if (PrintMiscellaneous && Verbose) {
4428 DWORD err = GetLastError();
4429 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4430 }
4431 // Don't consider this a hard error, on IA32 even if the
4432 // VirtualProtect fails, we should still be able to execute
4433 CloseHandle(hFile);
4434 return base;
4435 }
4436 }
4437
4438 if (CloseHandle(hFile) == 0) {
4439 if (PrintMiscellaneous && Verbose) {
4440 DWORD err = GetLastError();
4441 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4442 }
4443 return base;
4444 }
4445
4446 return base;
4447 }
4448
4449
4450 // Remap a block of memory.
4451 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4452 char *addr, size_t bytes, bool read_only,
4453 bool allow_exec) {
4454 // This OS does not allow existing memory maps to be remapped so we
4455 // have to unmap the memory before we remap it.
4456 if (!os::unmap_memory(addr, bytes)) {
4457 return NULL;
4458 }
4459
4460 // There is a very small theoretical window between the unmap_memory()
4461 // call above and the map_memory() call below where a thread in native
4462 // code may be able to access an address that is no longer mapped.
4463
4464 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4465 read_only, allow_exec);
4466 }
4467
4468
4469 // Unmap a block of memory.
4470 // Returns true=success, otherwise false.
4471
4472 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4473 BOOL result = UnmapViewOfFile(addr);
4474 if (result == 0) {
4475 if (PrintMiscellaneous && Verbose) {
4476 DWORD err = GetLastError();
4477 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4478 }
4479 return false;
4480 }
4481 return true;
4482 }
4483
4484 void os::pause() {
4485 char filename[MAX_PATH];
4486 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4487 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4488 } else {
4489 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4490 }
4491
4492 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4493 if (fd != -1) {
4494 struct stat buf;
4495 ::close(fd);
4496 while (::stat(filename, &buf) == 0) {
4497 Sleep(100);
4498 }
4499 } else {
4500 jio_fprintf(stderr,
4501 "Could not open pause file '%s', continuing immediately.\n", filename);
4502 }
4503 }
4504
4505 // An Event wraps a win32 "CreateEvent" kernel handle.
4506 //
4507 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4508 //
4509 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4510 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4511 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4512 // In addition, an unpark() operation might fetch the handle field, but the
4513 // event could recycle between the fetch and the SetEvent() operation.
4514 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4515 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4516 // on an stale but recycled handle would be harmless, but in practice this might
4517 // confuse other non-Sun code, so it's not a viable approach.
4518 //
4519 // 2: Once a win32 event handle is associated with an Event, it remains associated
4520 // with the Event. The event handle is never closed. This could be construed
4521 // as handle leakage, but only up to the maximum # of threads that have been extant
4522 // at any one time. This shouldn't be an issue, as windows platforms typically
4523 // permit a process to have hundreds of thousands of open handles.
4524 //
4525 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4526 // and release unused handles.
4527 //
4528 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4529 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4530 //
4531 // 5. Use an RCU-like mechanism (Read-Copy Update).
4532 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4533 //
4534 // We use (2).
4535 //
4536 // TODO-FIXME:
4537 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4538 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4539 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4540 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4541 // into a single win32 CreateEvent() handle.
4542 //
4543 // _Event transitions in park()
4544 // -1 => -1 : illegal
4545 // 1 => 0 : pass - return immediately
4546 // 0 => -1 : block
4547 //
4548 // _Event serves as a restricted-range semaphore :
4549 // -1 : thread is blocked
4550 // 0 : neutral - thread is running or ready
4551 // 1 : signaled - thread is running or ready
4552 //
4553 // Another possible encoding of _Event would be
4554 // with explicit "PARKED" and "SIGNALED" bits.
4555
4556 int os::PlatformEvent::park (jlong Millis) {
4557 guarantee (_ParkHandle != NULL , "Invariant") ;
4558 guarantee (Millis > 0 , "Invariant") ;
4559 int v ;
4560
4561 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4562 // the initial park() operation.
4563
4564 for (;;) {
4565 v = _Event ;
4566 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4567 }
4568 guarantee ((v == 0) || (v == 1), "invariant") ;
4569 if (v != 0) return OS_OK ;
4570
4571 // Do this the hard way by blocking ...
4572 // TODO: consider a brief spin here, gated on the success of recent
4573 // spin attempts by this thread.
4574 //
4575 // We decompose long timeouts into series of shorter timed waits.
4576 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4577 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4578 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4579 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4580 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4581 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4582 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4583 // for the already waited time. This policy does not admit any new outcomes.
4584 // In the future, however, we might want to track the accumulated wait time and
4585 // adjust Millis accordingly if we encounter a spurious wakeup.
4586
4587 const int MAXTIMEOUT = 0x10000000 ;
4588 DWORD rv = WAIT_TIMEOUT ;
4589 while (_Event < 0 && Millis > 0) {
4590 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4591 if (Millis > MAXTIMEOUT) {
4592 prd = MAXTIMEOUT ;
4593 }
4594 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4595 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4596 if (rv == WAIT_TIMEOUT) {
4597 Millis -= prd ;
4598 }
4599 }
4600 v = _Event ;
4601 _Event = 0 ;
4602 OrderAccess::fence() ;
4603 // If we encounter a nearly simultanous timeout expiry and unpark()
4604 // we return OS_OK indicating we awoke via unpark().
4605 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4606 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4607 }
4608
4609 void os::PlatformEvent::park () {
4610 guarantee (_ParkHandle != NULL, "Invariant") ;
4611 // Invariant: Only the thread associated with the Event/PlatformEvent
4612 // may call park().
4613 int v ;
4614 for (;;) {
4615 v = _Event ;
4616 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4617 }
4618 guarantee ((v == 0) || (v == 1), "invariant") ;
4619 if (v != 0) return ;
4620
4621 // Do this the hard way by blocking ...
4622 // TODO: consider a brief spin here, gated on the success of recent
4623 // spin attempts by this thread.
4624 while (_Event < 0) {
4625 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4626 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4627 }
4628
4629 // Usually we'll find _Event == 0 at this point, but as
4630 // an optional optimization we clear it, just in case can
4631 // multiple unpark() operations drove _Event up to 1.
4632 _Event = 0 ;
4633 OrderAccess::fence() ;
4634 guarantee (_Event >= 0, "invariant") ;
4635 }
4636
4637 void os::PlatformEvent::unpark() {
4638 guarantee (_ParkHandle != NULL, "Invariant") ;
4639 int v ;
4640 for (;;) {
4641 v = _Event ; // Increment _Event if it's < 1.
4642 if (v > 0) {
4643 // If it's already signaled just return.
4644 // The LD of _Event could have reordered or be satisfied
4645 // by a read-aside from this processor's write buffer.
4646 // To avoid problems execute a barrier and then
4647 // ratify the value. A degenerate CAS() would also work.
4648 // Viz., CAS (v+0, &_Event, v) == v).
4649 OrderAccess::fence() ;
4650 if (_Event == v) return ;
4651 continue ;
4652 }
4653 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4654 }
4655 if (v < 0) {
4656 ::SetEvent (_ParkHandle) ;
4657 }
4658 }
4659
4660
4661 // JSR166
4662 // -------------------------------------------------------
4663
4664 /*
4665 * The Windows implementation of Park is very straightforward: Basic
4666 * operations on Win32 Events turn out to have the right semantics to
4667 * use them directly. We opportunistically resuse the event inherited
4668 * from Monitor.
4669 */
4670
4671
4672 void Parker::park(bool isAbsolute, jlong time) {
4673 guarantee (_ParkEvent != NULL, "invariant") ;
4674 // First, demultiplex/decode time arguments
4675 if (time < 0) { // don't wait
4676 return;
4677 }
4678 else if (time == 0 && !isAbsolute) {
4679 time = INFINITE;
4680 }
4681 else if (isAbsolute) {
4682 time -= os::javaTimeMillis(); // convert to relative time
4683 if (time <= 0) // already elapsed
4684 return;
4685 }
4686 else { // relative
4687 time /= 1000000; // Must coarsen from nanos to millis
4688 if (time == 0) // Wait for the minimal time unit if zero
4689 time = 1;
4690 }
4691
4692 JavaThread* thread = (JavaThread*)(Thread::current());
4693 assert(thread->is_Java_thread(), "Must be JavaThread");
4694 JavaThread *jt = (JavaThread *)thread;
4695
4696 // Don't wait if interrupted or already triggered
4697 if (Thread::is_interrupted(thread, false) ||
4698 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4699 ResetEvent(_ParkEvent);
4700 return;
4701 }
4702 else {
4703 ThreadBlockInVM tbivm(jt);
4704 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4705 jt->set_suspend_equivalent();
4706
4707 WaitForSingleObject(_ParkEvent, time);
4708 ResetEvent(_ParkEvent);
4709
4710 // If externally suspended while waiting, re-suspend
4711 if (jt->handle_special_suspend_equivalent_condition()) {
4712 jt->java_suspend_self();
4713 }
4714 }
4715 }
4716
4717 void Parker::unpark() {
4718 guarantee (_ParkEvent != NULL, "invariant") ;
4719 SetEvent(_ParkEvent);
4720 }
4721
4722 // Run the specified command in a separate process. Return its exit value,
4723 // or -1 on failure (e.g. can't create a new process).
4724 int os::fork_and_exec(char* cmd) {
4725 STARTUPINFO si;
4726 PROCESS_INFORMATION pi;
4727
4728 memset(&si, 0, sizeof(si));
4729 si.cb = sizeof(si);
4730 memset(&pi, 0, sizeof(pi));
4731 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4732 cmd, // command line
4733 NULL, // process security attribute
4734 NULL, // thread security attribute
4735 TRUE, // inherits system handles
4736 0, // no creation flags
4737 NULL, // use parent's environment block
4738 NULL, // use parent's starting directory
4739 &si, // (in) startup information
4740 &pi); // (out) process information
4741
4742 if (rslt) {
4743 // Wait until child process exits.
4744 WaitForSingleObject(pi.hProcess, INFINITE);
4745
4746 DWORD exit_code;
4747 GetExitCodeProcess(pi.hProcess, &exit_code);
4748
4749 // Close process and thread handles.
4750 CloseHandle(pi.hProcess);
4751 CloseHandle(pi.hThread);
4752
4753 return (int)exit_code;
4754 } else {
4755 return -1;
4756 }
4757 }
4758
4759 //--------------------------------------------------------------------------------------------------
4760 // Non-product code
4761
4762 static int mallocDebugIntervalCounter = 0;
4763 static int mallocDebugCounter = 0;
4764 bool os::check_heap(bool force) {
4765 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4766 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4767 // Note: HeapValidate executes two hardware breakpoints when it finds something
4768 // wrong; at these points, eax contains the address of the offending block (I think).
4769 // To get to the exlicit error message(s) below, just continue twice.
4770 HANDLE heap = GetProcessHeap();
4771 { HeapLock(heap);
4772 PROCESS_HEAP_ENTRY phe;
4773 phe.lpData = NULL;
4774 while (HeapWalk(heap, &phe) != 0) {
4775 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4776 !HeapValidate(heap, 0, phe.lpData)) {
4777 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4778 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4779 fatal("corrupted C heap");
4780 }
4781 }
4782 DWORD err = GetLastError();
4783 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4784 fatal(err_msg("heap walk aborted with error %d", err));
4785 }
4786 HeapUnlock(heap);
4787 }
4788 mallocDebugIntervalCounter = 0;
4789 }
4790 return true;
4791 }
4792
4793
4794 bool os::find(address addr, outputStream* st) {
4795 // Nothing yet
4796 return false;
4797 }
4798
4799 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4800 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4801
4802 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4803 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4804 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4805 address addr = (address) exceptionRecord->ExceptionInformation[1];
4806
4807 if (os::is_memory_serialize_page(thread, addr))
4808 return EXCEPTION_CONTINUE_EXECUTION;
4809 }
4810
4811 return EXCEPTION_CONTINUE_SEARCH;
4812 }
4813
4814 // We don't build a headless jre for Windows
4815 bool os::is_headless_jre() { return false; }
4816
4817
4818 typedef CRITICAL_SECTION mutex_t;
4819 #define mutexInit(m) InitializeCriticalSection(m)
4820 #define mutexDestroy(m) DeleteCriticalSection(m)
4821 #define mutexLock(m) EnterCriticalSection(m)
4822 #define mutexUnlock(m) LeaveCriticalSection(m)
4823
4824 static bool sock_initialized = FALSE;
4825 static mutex_t sockFnTableMutex;
4826
4827 static void initSock() {
4828 WSADATA wsadata;
4829
4830 if (!os::WinSock2Dll::WinSock2Available()) {
4831 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n",
4832 ::GetLastError());
4833 return;
4834 }
4835 if (sock_initialized == TRUE) return;
4836
4837 ::mutexInit(&sockFnTableMutex);
4838 ::mutexLock(&sockFnTableMutex);
4839 if (os::WinSock2Dll::WSAStartup(MAKEWORD(1,1), &wsadata) != 0) {
4840 jio_fprintf(stderr, "Could not initialize Winsock\n");
4841 }
4842 sock_initialized = TRUE;
4843 ::mutexUnlock(&sockFnTableMutex);
4844 }
4845
4846 struct hostent* os::get_host_by_name(char* name) {
4847 if (!sock_initialized) {
4848 initSock();
4849 }
4850 if (!os::WinSock2Dll::WinSock2Available()) {
4851 return NULL;
4852 }
4853 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4854 }
4855
4856 int os::socket_close(int fd) {
4857 return ::closesocket(fd);
4858 }
4859
4860 int os::socket_available(int fd, jint *pbytes) {
4861 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
4862 return (ret < 0) ? 0 : 1;
4863 }
4864
4865 int os::socket(int domain, int type, int protocol) {
4866 return ::socket(domain, type, protocol);
4867 }
4868
4869 int os::listen(int fd, int count) {
4870 return ::listen(fd, count);
4871 }
4872
4873 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4874 return ::connect(fd, him, len);
4875 }
4876
4877 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4878 return ::accept(fd, him, len);
4879 }
4880
4881 int os::sendto(int fd, char* buf, size_t len, uint flags,
4882 struct sockaddr* to, socklen_t tolen) {
4883
4884 return ::sendto(fd, buf, (int)len, flags, to, tolen);
4885 }
4886
4887 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4888 sockaddr* from, socklen_t* fromlen) {
4889
4890 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
4891 }
4892
4893 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4894 return ::recv(fd, buf, (int)nBytes, flags);
4895 }
4896
4897 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
4898 return ::send(fd, buf, (int)nBytes, flags);
4899 }
4900
4901 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
4902 return ::send(fd, buf, (int)nBytes, flags);
4903 }
4904
4905 int os::timeout(int fd, long timeout) {
4906 fd_set tbl;
4907 struct timeval t;
4908
4909 t.tv_sec = timeout / 1000;
4910 t.tv_usec = (timeout % 1000) * 1000;
4911
4912 tbl.fd_count = 1;
4913 tbl.fd_array[0] = fd;
4914
4915 return ::select(1, &tbl, 0, 0, &t);
4916 }
4917
4918 int os::get_host_name(char* name, int namelen) {
4919 return ::gethostname(name, namelen);
4920 }
4921
4922 int os::socket_shutdown(int fd, int howto) {
4923 return ::shutdown(fd, howto);
4924 }
4925
4926 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
4927 return ::bind(fd, him, len);
4928 }
4929
4930 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
4931 return ::getsockname(fd, him, len);
4932 }
4933
4934 int os::get_sock_opt(int fd, int level, int optname,
4935 char* optval, socklen_t* optlen) {
4936 return ::getsockopt(fd, level, optname, optval, optlen);
4937 }
4938
4939 int os::set_sock_opt(int fd, int level, int optname,
4940 const char* optval, socklen_t optlen) {
4941 return ::setsockopt(fd, level, optname, optval, optlen);
4942 }
4943
4944
4945 // Kernel32 API
4946 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
4947 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
4948 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
4949 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
4950 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
4951
4952 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
4953 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
4954 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
4955 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
4956 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
4957
4958
4959 BOOL os::Kernel32Dll::initialized = FALSE;
4960 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
4961 assert(initialized && _GetLargePageMinimum != NULL,
4962 "GetLargePageMinimumAvailable() not yet called");
4963 return _GetLargePageMinimum();
4964 }
4965
4966 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
4967 if (!initialized) {
4968 initialize();
4969 }
4970 return _GetLargePageMinimum != NULL;
4971 }
4972
4973 BOOL os::Kernel32Dll::NumaCallsAvailable() {
4974 if (!initialized) {
4975 initialize();
4976 }
4977 return _VirtualAllocExNuma != NULL;
4978 }
4979
4980 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
4981 assert(initialized && _VirtualAllocExNuma != NULL,
4982 "NUMACallsAvailable() not yet called");
4983
4984 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
4985 }
4986
4987 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
4988 assert(initialized && _GetNumaHighestNodeNumber != NULL,
4989 "NUMACallsAvailable() not yet called");
4990
4991 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
4992 }
4993
4994 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
4995 assert(initialized && _GetNumaNodeProcessorMask != NULL,
4996 "NUMACallsAvailable() not yet called");
4997
4998 return _GetNumaNodeProcessorMask(node, proc_mask);
4999 }
5000
5001 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5002 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5003 if (!initialized) {
5004 initialize();
5005 }
5006
5007 if (_RtlCaptureStackBackTrace != NULL) {
5008 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5009 BackTrace, BackTraceHash);
5010 } else {
5011 return 0;
5012 }
5013 }
5014
5015 void os::Kernel32Dll::initializeCommon() {
5016 if (!initialized) {
5017 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5018 assert(handle != NULL, "Just check");
5019 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5020 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5021 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5022 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5023 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5024 initialized = TRUE;
5025 }
5026 }
5027
5028
5029
5030 #ifndef JDK6_OR_EARLIER
5031
5032 void os::Kernel32Dll::initialize() {
5033 initializeCommon();
5034 }
5035
5036
5037 // Kernel32 API
5038 inline BOOL os::Kernel32Dll::SwitchToThread() {
5039 return ::SwitchToThread();
5040 }
5041
5042 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5043 return true;
5044 }
5045
5046 // Help tools
5047 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5048 return true;
5049 }
5050
5051 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5052 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5053 }
5054
5055 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5056 return ::Module32First(hSnapshot, lpme);
5057 }
5058
5059 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5060 return ::Module32Next(hSnapshot, lpme);
5061 }
5062
5063
5064 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5065 return true;
5066 }
5067
5068 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5069 ::GetNativeSystemInfo(lpSystemInfo);
5070 }
5071
5072 // PSAPI API
5073 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5074 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5075 }
5076
5077 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5078 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5079 }
5080
5081 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5082 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5083 }
5084
5085 inline BOOL os::PSApiDll::PSApiAvailable() {
5086 return true;
5087 }
5088
5089
5090 // WinSock2 API
5091 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5092 return ::WSAStartup(wVersionRequested, lpWSAData);
5093 }
5094
5095 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5096 return ::gethostbyname(name);
5097 }
5098
5099 inline BOOL os::WinSock2Dll::WinSock2Available() {
5100 return true;
5101 }
5102
5103 // Advapi API
5104 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5105 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5106 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5107 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5108 BufferLength, PreviousState, ReturnLength);
5109 }
5110
5111 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5112 PHANDLE TokenHandle) {
5113 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5114 }
5115
5116 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5117 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5118 }
5119
5120 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5121 return true;
5122 }
5123
5124 #else
5125 // Kernel32 API
5126 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5127 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5128 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5129 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5130 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5131
5132 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5133 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5134 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5135 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5136 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5137
5138 void os::Kernel32Dll::initialize() {
5139 if (!initialized) {
5140 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5141 assert(handle != NULL, "Just check");
5142
5143 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5144 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5145 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5146 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5147 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5148 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5149 initializeCommon(); // resolve the functions that always need resolving
5150
5151 initialized = TRUE;
5152 }
5153 }
5154
5155 BOOL os::Kernel32Dll::SwitchToThread() {
5156 assert(initialized && _SwitchToThread != NULL,
5157 "SwitchToThreadAvailable() not yet called");
5158 return _SwitchToThread();
5159 }
5160
5161
5162 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5163 if (!initialized) {
5164 initialize();
5165 }
5166 return _SwitchToThread != NULL;
5167 }
5168
5169 // Help tools
5170 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5171 if (!initialized) {
5172 initialize();
5173 }
5174 return _CreateToolhelp32Snapshot != NULL &&
5175 _Module32First != NULL &&
5176 _Module32Next != NULL;
5177 }
5178
5179 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5180 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5181 "HelpToolsAvailable() not yet called");
5182
5183 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5184 }
5185
5186 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5187 assert(initialized && _Module32First != NULL,
5188 "HelpToolsAvailable() not yet called");
5189
5190 return _Module32First(hSnapshot, lpme);
5191 }
5192
5193 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5194 assert(initialized && _Module32Next != NULL,
5195 "HelpToolsAvailable() not yet called");
5196
5197 return _Module32Next(hSnapshot, lpme);
5198 }
5199
5200
5201 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5202 if (!initialized) {
5203 initialize();
5204 }
5205 return _GetNativeSystemInfo != NULL;
5206 }
5207
5208 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5209 assert(initialized && _GetNativeSystemInfo != NULL,
5210 "GetNativeSystemInfoAvailable() not yet called");
5211
5212 _GetNativeSystemInfo(lpSystemInfo);
5213 }
5214
5215 // PSAPI API
5216
5217
5218 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5219 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5220 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5221
5222 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5223 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5224 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5225 BOOL os::PSApiDll::initialized = FALSE;
5226
5227 void os::PSApiDll::initialize() {
5228 if (!initialized) {
5229 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5230 if (handle != NULL) {
5231 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5232 "EnumProcessModules");
5233 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5234 "GetModuleFileNameExA");
5235 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5236 "GetModuleInformation");
5237 }
5238 initialized = TRUE;
5239 }
5240 }
5241
5242
5243
5244 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5245 assert(initialized && _EnumProcessModules != NULL,
5246 "PSApiAvailable() not yet called");
5247 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5248 }
5249
5250 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5251 assert(initialized && _GetModuleFileNameEx != NULL,
5252 "PSApiAvailable() not yet called");
5253 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5254 }
5255
5256 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5257 assert(initialized && _GetModuleInformation != NULL,
5258 "PSApiAvailable() not yet called");
5259 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5260 }
5261
5262 BOOL os::PSApiDll::PSApiAvailable() {
5263 if (!initialized) {
5264 initialize();
5265 }
5266 return _EnumProcessModules != NULL &&
5267 _GetModuleFileNameEx != NULL &&
5268 _GetModuleInformation != NULL;
5269 }
5270
5271
5272 // WinSock2 API
5273 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5274 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5275
5276 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5277 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5278 BOOL os::WinSock2Dll::initialized = FALSE;
5279
5280 void os::WinSock2Dll::initialize() {
5281 if (!initialized) {
5282 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5283 if (handle != NULL) {
5284 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5285 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5286 }
5287 initialized = TRUE;
5288 }
5289 }
5290
5291
5292 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5293 assert(initialized && _WSAStartup != NULL,
5294 "WinSock2Available() not yet called");
5295 return _WSAStartup(wVersionRequested, lpWSAData);
5296 }
5297
5298 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5299 assert(initialized && _gethostbyname != NULL,
5300 "WinSock2Available() not yet called");
5301 return _gethostbyname(name);
5302 }
5303
5304 BOOL os::WinSock2Dll::WinSock2Available() {
5305 if (!initialized) {
5306 initialize();
5307 }
5308 return _WSAStartup != NULL &&
5309 _gethostbyname != NULL;
5310 }
5311
5312 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5313 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5314 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5315
5316 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5317 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5318 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5319 BOOL os::Advapi32Dll::initialized = FALSE;
5320
5321 void os::Advapi32Dll::initialize() {
5322 if (!initialized) {
5323 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5324 if (handle != NULL) {
5325 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5326 "AdjustTokenPrivileges");
5327 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5328 "OpenProcessToken");
5329 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5330 "LookupPrivilegeValueA");
5331 }
5332 initialized = TRUE;
5333 }
5334 }
5335
5336 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5337 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5338 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5339 assert(initialized && _AdjustTokenPrivileges != NULL,
5340 "AdvapiAvailable() not yet called");
5341 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5342 BufferLength, PreviousState, ReturnLength);
5343 }
5344
5345 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5346 PHANDLE TokenHandle) {
5347 assert(initialized && _OpenProcessToken != NULL,
5348 "AdvapiAvailable() not yet called");
5349 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5350 }
5351
5352 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5353 assert(initialized && _LookupPrivilegeValue != NULL,
5354 "AdvapiAvailable() not yet called");
5355 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5356 }
5357
5358 BOOL os::Advapi32Dll::AdvapiAvailable() {
5359 if (!initialized) {
5360 initialize();
5361 }
5362 return _AdjustTokenPrivileges != NULL &&
5363 _OpenProcessToken != NULL &&
5364 _LookupPrivilegeValue != NULL;
5365 }
5366
5367 #endif