1 /*
2 * Copyright (c) 1997, 2015, 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 Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
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 "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
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 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 thread->initialize_thread_current();
423
424 OSThread* osthr = thread->osthread();
425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
426
427 if (UseNUMA) {
428 int lgrp_id = os::numa_get_group_id();
429 if (lgrp_id != -1) {
430 thread->set_lgrp_id(lgrp_id);
431 }
432 }
433
434 // Diagnostic code to investigate JDK-6573254
435 int res = 30115; // non-java thread
436 if (thread->is_Java_thread()) {
437 res = 20115; // java thread
438 }
439
440 // Install a win32 structured exception handler around every thread created
441 // by VM, so VM can generate error dump when an exception occurred in non-
442 // Java thread (e.g. VM thread).
443 __try {
444 thread->run();
445 } __except(topLevelExceptionFilter(
446 (_EXCEPTION_POINTERS*)_exception_info())) {
447 // Nothing to do.
448 }
449
450 // One less thread is executing
451 // When the VMThread gets here, the main thread may have already exited
452 // which frees the CodeHeap containing the Atomic::add code
453 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
454 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
455 }
456
457 // Thread must not return from exit_process_or_thread(), but if it does,
458 // let it proceed to exit normally
459 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
460 }
461
462 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
463 int thread_id) {
464 // Allocate the OSThread object
465 OSThread* osthread = new OSThread(NULL, NULL);
466 if (osthread == NULL) return NULL;
467
468 // Initialize support for Java interrupts
469 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
470 if (interrupt_event == NULL) {
471 delete osthread;
472 return NULL;
473 }
474 osthread->set_interrupt_event(interrupt_event);
475
476 // Store info on the Win32 thread into the OSThread
477 osthread->set_thread_handle(thread_handle);
478 osthread->set_thread_id(thread_id);
479
480 if (UseNUMA) {
481 int lgrp_id = os::numa_get_group_id();
482 if (lgrp_id != -1) {
483 thread->set_lgrp_id(lgrp_id);
484 }
485 }
486
487 // Initial thread state is INITIALIZED, not SUSPENDED
488 osthread->set_state(INITIALIZED);
489
490 return osthread;
491 }
492
493
494 bool os::create_attached_thread(JavaThread* thread) {
495 #ifdef ASSERT
496 thread->verify_not_published();
497 #endif
498 HANDLE thread_h;
499 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
500 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
501 fatal("DuplicateHandle failed\n");
502 }
503 OSThread* osthread = create_os_thread(thread, thread_h,
504 (int)current_thread_id());
505 if (osthread == NULL) {
506 return false;
507 }
508
509 // Initial thread state is RUNNABLE
510 osthread->set_state(RUNNABLE);
511
512 thread->set_osthread(osthread);
513 return true;
514 }
515
516 bool os::create_main_thread(JavaThread* thread) {
517 #ifdef ASSERT
518 thread->verify_not_published();
519 #endif
520 if (_starting_thread == NULL) {
521 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
522 if (_starting_thread == NULL) {
523 return false;
524 }
525 }
526
527 // The primordial thread is runnable from the start)
528 _starting_thread->set_state(RUNNABLE);
529
530 thread->set_osthread(_starting_thread);
531 return true;
532 }
533
534 // Allocate and initialize a new OSThread
535 bool os::create_thread(Thread* thread, ThreadType thr_type,
536 size_t stack_size) {
537 unsigned thread_id;
538
539 // Allocate the OSThread object
540 OSThread* osthread = new OSThread(NULL, NULL);
541 if (osthread == NULL) {
542 return false;
543 }
544
545 // Initialize support for Java interrupts
546 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
547 if (interrupt_event == NULL) {
548 delete osthread;
549 return NULL;
550 }
551 osthread->set_interrupt_event(interrupt_event);
552 osthread->set_interrupted(false);
553
554 thread->set_osthread(osthread);
555
556 if (stack_size == 0) {
557 switch (thr_type) {
558 case os::java_thread:
559 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
560 if (JavaThread::stack_size_at_create() > 0) {
561 stack_size = JavaThread::stack_size_at_create();
562 }
563 break;
564 case os::compiler_thread:
565 if (CompilerThreadStackSize > 0) {
566 stack_size = (size_t)(CompilerThreadStackSize * K);
567 break;
568 } // else fall through:
569 // use VMThreadStackSize if CompilerThreadStackSize is not defined
570 case os::vm_thread:
571 case os::pgc_thread:
572 case os::cgc_thread:
573 case os::watcher_thread:
574 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
575 break;
576 }
577 }
578
579 // Create the Win32 thread
580 //
581 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
582 // does not specify stack size. Instead, it specifies the size of
583 // initially committed space. The stack size is determined by
584 // PE header in the executable. If the committed "stack_size" is larger
585 // than default value in the PE header, the stack is rounded up to the
586 // nearest multiple of 1MB. For example if the launcher has default
587 // stack size of 320k, specifying any size less than 320k does not
588 // affect the actual stack size at all, it only affects the initial
589 // commitment. On the other hand, specifying 'stack_size' larger than
590 // default value may cause significant increase in memory usage, because
591 // not only the stack space will be rounded up to MB, but also the
592 // entire space is committed upfront.
593 //
594 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
595 // for CreateThread() that can treat 'stack_size' as stack size. However we
596 // are not supposed to call CreateThread() directly according to MSDN
597 // document because JVM uses C runtime library. The good news is that the
598 // flag appears to work with _beginthredex() as well.
599
600 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
601 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
602 #endif
603
604 HANDLE thread_handle =
605 (HANDLE)_beginthreadex(NULL,
606 (unsigned)stack_size,
607 (unsigned (__stdcall *)(void*)) java_start,
608 thread,
609 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
610 &thread_id);
611 if (thread_handle == NULL) {
612 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
613 // without the flag.
614 thread_handle =
615 (HANDLE)_beginthreadex(NULL,
616 (unsigned)stack_size,
617 (unsigned (__stdcall *)(void*)) java_start,
618 thread,
619 CREATE_SUSPENDED,
620 &thread_id);
621 }
622 if (thread_handle == NULL) {
623 // Need to clean up stuff we've allocated so far
624 CloseHandle(osthread->interrupt_event());
625 thread->set_osthread(NULL);
626 delete osthread;
627 return NULL;
628 }
629
630 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
631
632 // Store info on the Win32 thread into the OSThread
633 osthread->set_thread_handle(thread_handle);
634 osthread->set_thread_id(thread_id);
635
636 // Initial thread state is INITIALIZED, not SUSPENDED
637 osthread->set_state(INITIALIZED);
638
639 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
640 return true;
641 }
642
643
644 // Free Win32 resources related to the OSThread
645 void os::free_thread(OSThread* osthread) {
646 assert(osthread != NULL, "osthread not set");
647 CloseHandle(osthread->thread_handle());
648 CloseHandle(osthread->interrupt_event());
649 delete osthread;
650 }
651
652 static jlong first_filetime;
653 static jlong initial_performance_count;
654 static jlong performance_frequency;
655
656
657 jlong as_long(LARGE_INTEGER x) {
658 jlong result = 0; // initialization to avoid warning
659 set_high(&result, x.HighPart);
660 set_low(&result, x.LowPart);
661 return result;
662 }
663
664
665 jlong os::elapsed_counter() {
666 LARGE_INTEGER count;
667 if (win32::_has_performance_count) {
668 QueryPerformanceCounter(&count);
669 return as_long(count) - initial_performance_count;
670 } else {
671 FILETIME wt;
672 GetSystemTimeAsFileTime(&wt);
673 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
674 }
675 }
676
677
678 jlong os::elapsed_frequency() {
679 if (win32::_has_performance_count) {
680 return performance_frequency;
681 } else {
682 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
683 return 10000000;
684 }
685 }
686
687
688 julong os::available_memory() {
689 return win32::available_memory();
690 }
691
692 julong os::win32::available_memory() {
693 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
694 // value if total memory is larger than 4GB
695 MEMORYSTATUSEX ms;
696 ms.dwLength = sizeof(ms);
697 GlobalMemoryStatusEx(&ms);
698
699 return (julong)ms.ullAvailPhys;
700 }
701
702 julong os::physical_memory() {
703 return win32::physical_memory();
704 }
705
706 bool os::has_allocatable_memory_limit(julong* limit) {
707 MEMORYSTATUSEX ms;
708 ms.dwLength = sizeof(ms);
709 GlobalMemoryStatusEx(&ms);
710 #ifdef _LP64
711 *limit = (julong)ms.ullAvailVirtual;
712 return true;
713 #else
714 // Limit to 1400m because of the 2gb address space wall
715 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
716 return true;
717 #endif
718 }
719
720 // VC6 lacks DWORD_PTR
721 #if _MSC_VER < 1300
722 typedef UINT_PTR DWORD_PTR;
723 #endif
724
725 int os::active_processor_count() {
726 DWORD_PTR lpProcessAffinityMask = 0;
727 DWORD_PTR lpSystemAffinityMask = 0;
728 int proc_count = processor_count();
729 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
730 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
731 // Nof active processors is number of bits in process affinity mask
732 int bitcount = 0;
733 while (lpProcessAffinityMask != 0) {
734 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
735 bitcount++;
736 }
737 return bitcount;
738 } else {
739 return proc_count;
740 }
741 }
742
743 void os::set_native_thread_name(const char *name) {
744
745 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
746 //
747 // Note that unfortunately this only works if the process
748 // is already attached to a debugger; debugger must observe
749 // the exception below to show the correct name.
750
751 const DWORD MS_VC_EXCEPTION = 0x406D1388;
752 struct {
753 DWORD dwType; // must be 0x1000
754 LPCSTR szName; // pointer to name (in user addr space)
755 DWORD dwThreadID; // thread ID (-1=caller thread)
756 DWORD dwFlags; // reserved for future use, must be zero
757 } info;
758
759 info.dwType = 0x1000;
760 info.szName = name;
761 info.dwThreadID = -1;
762 info.dwFlags = 0;
763
764 __try {
765 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
766 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
767 }
768
769 bool os::distribute_processes(uint length, uint* distribution) {
770 // Not yet implemented.
771 return false;
772 }
773
774 bool os::bind_to_processor(uint processor_id) {
775 // Not yet implemented.
776 return false;
777 }
778
779 void os::win32::initialize_performance_counter() {
780 LARGE_INTEGER count;
781 if (QueryPerformanceFrequency(&count)) {
782 win32::_has_performance_count = 1;
783 performance_frequency = as_long(count);
784 QueryPerformanceCounter(&count);
785 initial_performance_count = as_long(count);
786 } else {
787 win32::_has_performance_count = 0;
788 FILETIME wt;
789 GetSystemTimeAsFileTime(&wt);
790 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
791 }
792 }
793
794
795 double os::elapsedTime() {
796 return (double) elapsed_counter() / (double) elapsed_frequency();
797 }
798
799
800 // Windows format:
801 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
802 // Java format:
803 // Java standards require the number of milliseconds since 1/1/1970
804
805 // Constant offset - calculated using offset()
806 static jlong _offset = 116444736000000000;
807 // Fake time counter for reproducible results when debugging
808 static jlong fake_time = 0;
809
810 #ifdef ASSERT
811 // Just to be safe, recalculate the offset in debug mode
812 static jlong _calculated_offset = 0;
813 static int _has_calculated_offset = 0;
814
815 jlong offset() {
816 if (_has_calculated_offset) return _calculated_offset;
817 SYSTEMTIME java_origin;
818 java_origin.wYear = 1970;
819 java_origin.wMonth = 1;
820 java_origin.wDayOfWeek = 0; // ignored
821 java_origin.wDay = 1;
822 java_origin.wHour = 0;
823 java_origin.wMinute = 0;
824 java_origin.wSecond = 0;
825 java_origin.wMilliseconds = 0;
826 FILETIME jot;
827 if (!SystemTimeToFileTime(&java_origin, &jot)) {
828 fatal("Error = %d\nWindows error", GetLastError());
829 }
830 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
831 _has_calculated_offset = 1;
832 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
833 return _calculated_offset;
834 }
835 #else
836 jlong offset() {
837 return _offset;
838 }
839 #endif
840
841 jlong windows_to_java_time(FILETIME wt) {
842 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
843 return (a - offset()) / 10000;
844 }
845
846 // Returns time ticks in (10th of micro seconds)
847 jlong windows_to_time_ticks(FILETIME wt) {
848 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
849 return (a - offset());
850 }
851
852 FILETIME java_to_windows_time(jlong l) {
853 jlong a = (l * 10000) + offset();
854 FILETIME result;
855 result.dwHighDateTime = high(a);
856 result.dwLowDateTime = low(a);
857 return result;
858 }
859
860 bool os::supports_vtime() { return true; }
861 bool os::enable_vtime() { return false; }
862 bool os::vtime_enabled() { return false; }
863
864 double os::elapsedVTime() {
865 FILETIME created;
866 FILETIME exited;
867 FILETIME kernel;
868 FILETIME user;
869 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
870 // the resolution of windows_to_java_time() should be sufficient (ms)
871 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
872 } else {
873 return elapsedTime();
874 }
875 }
876
877 jlong os::javaTimeMillis() {
878 if (UseFakeTimers) {
879 return fake_time++;
880 } else {
881 FILETIME wt;
882 GetSystemTimeAsFileTime(&wt);
883 return windows_to_java_time(wt);
884 }
885 }
886
887 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
888 FILETIME wt;
889 GetSystemTimeAsFileTime(&wt);
890 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
891 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
892 seconds = secs;
893 nanos = jlong(ticks - (secs*10000000)) * 100;
894 }
895
896 jlong os::javaTimeNanos() {
897 if (!win32::_has_performance_count) {
898 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
899 } else {
900 LARGE_INTEGER current_count;
901 QueryPerformanceCounter(¤t_count);
902 double current = as_long(current_count);
903 double freq = performance_frequency;
904 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
905 return time;
906 }
907 }
908
909 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
910 if (!win32::_has_performance_count) {
911 // javaTimeMillis() doesn't have much percision,
912 // but it is not going to wrap -- so all 64 bits
913 info_ptr->max_value = ALL_64_BITS;
914
915 // this is a wall clock timer, so may skip
916 info_ptr->may_skip_backward = true;
917 info_ptr->may_skip_forward = true;
918 } else {
919 jlong freq = performance_frequency;
920 if (freq < NANOSECS_PER_SEC) {
921 // the performance counter is 64 bits and we will
922 // be multiplying it -- so no wrap in 64 bits
923 info_ptr->max_value = ALL_64_BITS;
924 } else if (freq > NANOSECS_PER_SEC) {
925 // use the max value the counter can reach to
926 // determine the max value which could be returned
927 julong max_counter = (julong)ALL_64_BITS;
928 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
929 } else {
930 // the performance counter is 64 bits and we will
931 // be using it directly -- so no wrap in 64 bits
932 info_ptr->max_value = ALL_64_BITS;
933 }
934
935 // using a counter, so no skipping
936 info_ptr->may_skip_backward = false;
937 info_ptr->may_skip_forward = false;
938 }
939 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
940 }
941
942 char* os::local_time_string(char *buf, size_t buflen) {
943 SYSTEMTIME st;
944 GetLocalTime(&st);
945 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
946 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
947 return buf;
948 }
949
950 bool os::getTimesSecs(double* process_real_time,
951 double* process_user_time,
952 double* process_system_time) {
953 HANDLE h_process = GetCurrentProcess();
954 FILETIME create_time, exit_time, kernel_time, user_time;
955 BOOL result = GetProcessTimes(h_process,
956 &create_time,
957 &exit_time,
958 &kernel_time,
959 &user_time);
960 if (result != 0) {
961 FILETIME wt;
962 GetSystemTimeAsFileTime(&wt);
963 jlong rtc_millis = windows_to_java_time(wt);
964 jlong user_millis = windows_to_java_time(user_time);
965 jlong system_millis = windows_to_java_time(kernel_time);
966 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
967 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
968 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
969 return true;
970 } else {
971 return false;
972 }
973 }
974
975 void os::shutdown() {
976 // allow PerfMemory to attempt cleanup of any persistent resources
977 perfMemory_exit();
978
979 // flush buffered output, finish log files
980 ostream_abort();
981
982 // Check for abort hook
983 abort_hook_t abort_hook = Arguments::abort_hook();
984 if (abort_hook != NULL) {
985 abort_hook();
986 }
987 }
988
989
990 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
991 PMINIDUMP_EXCEPTION_INFORMATION,
992 PMINIDUMP_USER_STREAM_INFORMATION,
993 PMINIDUMP_CALLBACK_INFORMATION);
994
995 static HANDLE dumpFile = NULL;
996
997 // Check if dump file can be created.
998 void os::check_dump_limit(char* buffer, size_t buffsz) {
999 bool status = true;
1000 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1001 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1002 status = false;
1003 }
1004
1005 #ifndef ASSERT
1006 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1007 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1008 status = false;
1009 }
1010 #endif
1011
1012 if (status) {
1013 const char* cwd = get_current_directory(NULL, 0);
1014 int pid = current_process_id();
1015 if (cwd != NULL) {
1016 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1017 } else {
1018 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1019 }
1020
1021 if (dumpFile == NULL &&
1022 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1023 == INVALID_HANDLE_VALUE) {
1024 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1025 status = false;
1026 }
1027 }
1028 VMError::record_coredump_status(buffer, status);
1029 }
1030
1031 void os::abort(bool dump_core, void* siginfo, void* context) {
1032 HINSTANCE dbghelp;
1033 EXCEPTION_POINTERS ep;
1034 MINIDUMP_EXCEPTION_INFORMATION mei;
1035 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1036
1037 HANDLE hProcess = GetCurrentProcess();
1038 DWORD processId = GetCurrentProcessId();
1039 MINIDUMP_TYPE dumpType;
1040
1041 shutdown();
1042 if (!dump_core || dumpFile == NULL) {
1043 if (dumpFile != NULL) {
1044 CloseHandle(dumpFile);
1045 }
1046 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1047 }
1048
1049 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1050
1051 if (dbghelp == NULL) {
1052 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1053 CloseHandle(dumpFile);
1054 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1055 }
1056
1057 _MiniDumpWriteDump =
1058 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1059 PMINIDUMP_EXCEPTION_INFORMATION,
1060 PMINIDUMP_USER_STREAM_INFORMATION,
1061 PMINIDUMP_CALLBACK_INFORMATION),
1062 GetProcAddress(dbghelp,
1063 "MiniDumpWriteDump"));
1064
1065 if (_MiniDumpWriteDump == NULL) {
1066 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1067 CloseHandle(dumpFile);
1068 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1069 }
1070
1071 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1072
1073 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1074 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1075 #if API_VERSION_NUMBER >= 11
1076 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1077 MiniDumpWithUnloadedModules);
1078 #endif
1079
1080 if (siginfo != NULL && context != NULL) {
1081 ep.ContextRecord = (PCONTEXT) context;
1082 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1083
1084 mei.ThreadId = GetCurrentThreadId();
1085 mei.ExceptionPointers = &ep;
1086 pmei = &mei;
1087 } else {
1088 pmei = NULL;
1089 }
1090
1091 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1092 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1093 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1094 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1095 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1096 }
1097 CloseHandle(dumpFile);
1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1099 }
1100
1101 // Die immediately, no exit hook, no abort hook, no cleanup.
1102 void os::die() {
1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1104 }
1105
1106 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1107 // * dirent_md.c 1.15 00/02/02
1108 //
1109 // The declarations for DIR and struct dirent are in jvm_win32.h.
1110
1111 // Caller must have already run dirname through JVM_NativePath, which removes
1112 // duplicate slashes and converts all instances of '/' into '\\'.
1113
1114 DIR * os::opendir(const char *dirname) {
1115 assert(dirname != NULL, "just checking"); // hotspot change
1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1117 DWORD fattr; // hotspot change
1118 char alt_dirname[4] = { 0, 0, 0, 0 };
1119
1120 if (dirp == 0) {
1121 errno = ENOMEM;
1122 return 0;
1123 }
1124
1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1126 // as a directory in FindFirstFile(). We detect this case here and
1127 // prepend the current drive name.
1128 //
1129 if (dirname[1] == '\0' && dirname[0] == '\\') {
1130 alt_dirname[0] = _getdrive() + 'A' - 1;
1131 alt_dirname[1] = ':';
1132 alt_dirname[2] = '\\';
1133 alt_dirname[3] = '\0';
1134 dirname = alt_dirname;
1135 }
1136
1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1138 if (dirp->path == 0) {
1139 free(dirp);
1140 errno = ENOMEM;
1141 return 0;
1142 }
1143 strcpy(dirp->path, dirname);
1144
1145 fattr = GetFileAttributes(dirp->path);
1146 if (fattr == 0xffffffff) {
1147 free(dirp->path);
1148 free(dirp);
1149 errno = ENOENT;
1150 return 0;
1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1152 free(dirp->path);
1153 free(dirp);
1154 errno = ENOTDIR;
1155 return 0;
1156 }
1157
1158 // Append "*.*", or possibly "\\*.*", to path
1159 if (dirp->path[1] == ':' &&
1160 (dirp->path[2] == '\0' ||
1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1162 // No '\\' needed for cases like "Z:" or "Z:\"
1163 strcat(dirp->path, "*.*");
1164 } else {
1165 strcat(dirp->path, "\\*.*");
1166 }
1167
1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1169 if (dirp->handle == INVALID_HANDLE_VALUE) {
1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1171 free(dirp->path);
1172 free(dirp);
1173 errno = EACCES;
1174 return 0;
1175 }
1176 }
1177 return dirp;
1178 }
1179
1180 // parameter dbuf unused on Windows
1181 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1182 assert(dirp != NULL, "just checking"); // hotspot change
1183 if (dirp->handle == INVALID_HANDLE_VALUE) {
1184 return 0;
1185 }
1186
1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1188
1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1190 if (GetLastError() == ERROR_INVALID_HANDLE) {
1191 errno = EBADF;
1192 return 0;
1193 }
1194 FindClose(dirp->handle);
1195 dirp->handle = INVALID_HANDLE_VALUE;
1196 }
1197
1198 return &dirp->dirent;
1199 }
1200
1201 int os::closedir(DIR *dirp) {
1202 assert(dirp != NULL, "just checking"); // hotspot change
1203 if (dirp->handle != INVALID_HANDLE_VALUE) {
1204 if (!FindClose(dirp->handle)) {
1205 errno = EBADF;
1206 return -1;
1207 }
1208 dirp->handle = INVALID_HANDLE_VALUE;
1209 }
1210 free(dirp->path);
1211 free(dirp);
1212 return 0;
1213 }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() {
1218 static char path_buf[MAX_PATH];
1219 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1220 return path_buf;
1221 } else {
1222 path_buf[0] = '\0';
1223 return path_buf;
1224 }
1225 }
1226
1227 static bool file_exists(const char* filename) {
1228 if (filename == NULL || strlen(filename) == 0) {
1229 return false;
1230 }
1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1232 }
1233
1234 bool os::dll_build_name(char *buffer, size_t buflen,
1235 const char* pname, const char* fname) {
1236 bool retval = false;
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1239
1240 // Return error on buffer overflow.
1241 if (pnamelen + strlen(fname) + 10 > buflen) {
1242 return retval;
1243 }
1244
1245 if (pnamelen == 0) {
1246 jio_snprintf(buffer, buflen, "%s.dll", fname);
1247 retval = true;
1248 } else if (c == ':' || c == '\\') {
1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1250 retval = true;
1251 } else if (strchr(pname, *os::path_separator()) != NULL) {
1252 int n;
1253 char** pelements = split_path(pname, &n);
1254 if (pelements == NULL) {
1255 return false;
1256 }
1257 for (int i = 0; i < n; i++) {
1258 char* path = pelements[i];
1259 // Really shouldn't be NULL, but check can't hurt
1260 size_t plen = (path == NULL) ? 0 : strlen(path);
1261 if (plen == 0) {
1262 continue; // skip the empty path values
1263 }
1264 const char lastchar = path[plen - 1];
1265 if (lastchar == ':' || lastchar == '\\') {
1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1267 } else {
1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1269 }
1270 if (file_exists(buffer)) {
1271 retval = true;
1272 break;
1273 }
1274 }
1275 // release the storage
1276 for (int i = 0; i < n; i++) {
1277 if (pelements[i] != NULL) {
1278 FREE_C_HEAP_ARRAY(char, pelements[i]);
1279 }
1280 }
1281 if (pelements != NULL) {
1282 FREE_C_HEAP_ARRAY(char*, pelements);
1283 }
1284 } else {
1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1286 retval = true;
1287 }
1288 return retval;
1289 }
1290
1291 // Needs to be in os specific directory because windows requires another
1292 // header file <direct.h>
1293 const char* os::get_current_directory(char *buf, size_t buflen) {
1294 int n = static_cast<int>(buflen);
1295 if (buflen > INT_MAX) n = INT_MAX;
1296 return _getcwd(buf, n);
1297 }
1298
1299 //-----------------------------------------------------------
1300 // Helper functions for fatal error handler
1301 #ifdef _WIN64
1302 // Helper routine which returns true if address in
1303 // within the NTDLL address space.
1304 //
1305 static bool _addr_in_ntdll(address addr) {
1306 HMODULE hmod;
1307 MODULEINFO minfo;
1308
1309 hmod = GetModuleHandle("NTDLL.DLL");
1310 if (hmod == NULL) return false;
1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1312 &minfo, sizeof(MODULEINFO))) {
1313 return false;
1314 }
1315
1316 if ((addr >= minfo.lpBaseOfDll) &&
1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1318 return true;
1319 } else {
1320 return false;
1321 }
1322 }
1323 #endif
1324
1325 struct _modinfo {
1326 address addr;
1327 char* full_path; // point to a char buffer
1328 int buflen; // size of the buffer
1329 address base_addr;
1330 };
1331
1332 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 struct _modinfo *pmod = (struct _modinfo *)param;
1335 if (!pmod) return -1;
1336
1337 if (base_addr <= pmod->addr &&
1338 top_address > pmod->addr) {
1339 // if a buffer is provided, copy path name to the buffer
1340 if (pmod->full_path) {
1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1342 }
1343 pmod->base_addr = base_addr;
1344 return 1;
1345 }
1346 return 0;
1347 }
1348
1349 bool os::dll_address_to_library_name(address addr, char* buf,
1350 int buflen, int* offset) {
1351 // buf is not optional, but offset is optional
1352 assert(buf != NULL, "sanity check");
1353
1354 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1355 // return the full path to the DLL file, sometimes it returns path
1356 // to the corresponding PDB file (debug info); sometimes it only
1357 // returns partial path, which makes life painful.
1358
1359 struct _modinfo mi;
1360 mi.addr = addr;
1361 mi.full_path = buf;
1362 mi.buflen = buflen;
1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1364 // buf already contains path name
1365 if (offset) *offset = addr - mi.base_addr;
1366 return true;
1367 }
1368
1369 buf[0] = '\0';
1370 if (offset) *offset = -1;
1371 return false;
1372 }
1373
1374 bool os::dll_address_to_function_name(address addr, char *buf,
1375 int buflen, int *offset,
1376 bool demangle) {
1377 // buf is not optional, but offset is optional
1378 assert(buf != NULL, "sanity check");
1379
1380 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1381 return true;
1382 }
1383 if (offset != NULL) *offset = -1;
1384 buf[0] = '\0';
1385 return false;
1386 }
1387
1388 // save the start and end address of jvm.dll into param[0] and param[1]
1389 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1390 address top_address, void * param) {
1391 if (!param) return -1;
1392
1393 if (base_addr <= (address)_locate_jvm_dll &&
1394 top_address > (address)_locate_jvm_dll) {
1395 ((address*)param)[0] = base_addr;
1396 ((address*)param)[1] = top_address;
1397 return 1;
1398 }
1399 return 0;
1400 }
1401
1402 address vm_lib_location[2]; // start and end address of jvm.dll
1403
1404 // check if addr is inside jvm.dll
1405 bool os::address_is_in_vm(address addr) {
1406 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1408 assert(false, "Can't find jvm module.");
1409 return false;
1410 }
1411 }
1412
1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1414 }
1415
1416 // print module info; param is outputStream*
1417 static int _print_module(const char* fname, address base_address,
1418 address top_address, void* param) {
1419 if (!param) return -1;
1420
1421 outputStream* st = (outputStream*)param;
1422
1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1424 return 0;
1425 }
1426
1427 // Loads .dll/.so and
1428 // in case of error it checks if .dll/.so was built for the
1429 // same architecture as Hotspot is running on
1430 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1431 void * result = LoadLibrary(name);
1432 if (result != NULL) {
1433 return result;
1434 }
1435
1436 DWORD errcode = GetLastError();
1437 if (errcode == ERROR_MOD_NOT_FOUND) {
1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1439 ebuf[ebuflen - 1] = '\0';
1440 return NULL;
1441 }
1442
1443 // Parsing dll below
1444 // If we can read dll-info and find that dll was built
1445 // for an architecture other than Hotspot is running in
1446 // - then print to buffer "DLL was built for a different architecture"
1447 // else call os::lasterror to obtain system error message
1448
1449 // Read system error message into ebuf
1450 // It may or may not be overwritten below (in the for loop and just above)
1451 lasterror(ebuf, (size_t) ebuflen);
1452 ebuf[ebuflen - 1] = '\0';
1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1454 if (fd < 0) {
1455 return NULL;
1456 }
1457
1458 uint32_t signature_offset;
1459 uint16_t lib_arch = 0;
1460 bool failed_to_get_lib_arch =
1461 ( // Go to position 3c in the dll
1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1463 ||
1464 // Read location of signature
1465 (sizeof(signature_offset) !=
1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1467 ||
1468 // Go to COFF File Header in dll
1469 // that is located after "signature" (4 bytes long)
1470 (os::seek_to_file_offset(fd,
1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1472 ||
1473 // Read field that contains code of architecture
1474 // that dll was built for
1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1476 );
1477
1478 ::close(fd);
1479 if (failed_to_get_lib_arch) {
1480 // file i/o error - report os::lasterror(...) msg
1481 return NULL;
1482 }
1483
1484 typedef struct {
1485 uint16_t arch_code;
1486 char* arch_name;
1487 } arch_t;
1488
1489 static const arch_t arch_array[] = {
1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1493 };
1494 #if (defined _M_IA64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1496 #elif (defined _M_AMD64)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1498 #elif (defined _M_IX86)
1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1500 #else
1501 #error Method os::dll_load requires that one of following \
1502 is defined :_M_IA64,_M_AMD64 or _M_IX86
1503 #endif
1504
1505
1506 // Obtain a string for printf operation
1507 // lib_arch_str shall contain string what platform this .dll was built for
1508 // running_arch_str shall string contain what platform Hotspot was built for
1509 char *running_arch_str = NULL, *lib_arch_str = NULL;
1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1511 if (lib_arch == arch_array[i].arch_code) {
1512 lib_arch_str = arch_array[i].arch_name;
1513 }
1514 if (running_arch == arch_array[i].arch_code) {
1515 running_arch_str = arch_array[i].arch_name;
1516 }
1517 }
1518
1519 assert(running_arch_str,
1520 "Didn't find running architecture code in arch_array");
1521
1522 // If the architecture is right
1523 // but some other error took place - report os::lasterror(...) msg
1524 if (lib_arch == running_arch) {
1525 return NULL;
1526 }
1527
1528 if (lib_arch_str != NULL) {
1529 ::_snprintf(ebuf, ebuflen - 1,
1530 "Can't load %s-bit .dll on a %s-bit platform",
1531 lib_arch_str, running_arch_str);
1532 } else {
1533 // don't know what architecture this dll was build for
1534 ::_snprintf(ebuf, ebuflen - 1,
1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1536 lib_arch, running_arch_str);
1537 }
1538
1539 return NULL;
1540 }
1541
1542 void os::print_dll_info(outputStream *st) {
1543 st->print_cr("Dynamic libraries:");
1544 get_loaded_modules_info(_print_module, (void *)st);
1545 }
1546
1547 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1548 HANDLE hProcess;
1549
1550 # define MAX_NUM_MODULES 128
1551 HMODULE modules[MAX_NUM_MODULES];
1552 static char filename[MAX_PATH];
1553 int result = 0;
1554
1555 if (!os::PSApiDll::PSApiAvailable()) {
1556 return 0;
1557 }
1558
1559 int pid = os::current_process_id();
1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1561 FALSE, pid);
1562 if (hProcess == NULL) return 0;
1563
1564 DWORD size_needed;
1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1566 sizeof(modules), &size_needed)) {
1567 CloseHandle(hProcess);
1568 return 0;
1569 }
1570
1571 // number of modules that are currently loaded
1572 int num_modules = size_needed / sizeof(HMODULE);
1573
1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1575 // Get Full pathname:
1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1577 filename, sizeof(filename))) {
1578 filename[0] = '\0';
1579 }
1580
1581 MODULEINFO modinfo;
1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1583 &modinfo, sizeof(modinfo))) {
1584 modinfo.lpBaseOfDll = NULL;
1585 modinfo.SizeOfImage = 0;
1586 }
1587
1588 // Invoke callback function
1589 result = callback(filename, (address)modinfo.lpBaseOfDll,
1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1591 if (result) break;
1592 }
1593
1594 CloseHandle(hProcess);
1595 return result;
1596 }
1597
1598 #ifndef PRODUCT
1599 bool os::get_host_name(char* buf, size_t buflen) {
1600 DWORD size = (DWORD)buflen;
1601 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1602 }
1603 #endif // PRODUCT
1604
1605 void os::get_summary_os_info(char* buf, size_t buflen) {
1606 stringStream sst(buf, buflen);
1607 os::win32::print_windows_version(&sst);
1608 // chop off newline character
1609 char* nl = strchr(buf, '\n');
1610 if (nl != NULL) *nl = '\0';
1611 }
1612
1613 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1614 int ret = vsnprintf(buf, len, fmt, args);
1615 // Get the correct buffer size if buf is too small
1616 if (ret < 0) {
1617 return _vscprintf(fmt, args);
1618 }
1619 return ret;
1620 }
1621
1622 void os::print_os_info_brief(outputStream* st) {
1623 os::print_os_info(st);
1624 }
1625
1626 void os::print_os_info(outputStream* st) {
1627 #ifdef ASSERT
1628 char buffer[1024];
1629 st->print("HostName: ");
1630 if (get_host_name(buffer, sizeof(buffer))) {
1631 st->print("%s ", buffer);
1632 } else {
1633 st->print("N/A ");
1634 }
1635 #endif
1636 st->print("OS:");
1637 os::win32::print_windows_version(st);
1638 }
1639
1640 void os::win32::print_windows_version(outputStream* st) {
1641 OSVERSIONINFOEX osvi;
1642 VS_FIXEDFILEINFO *file_info;
1643 TCHAR kernel32_path[MAX_PATH];
1644 UINT len, ret;
1645
1646 // Use the GetVersionEx information to see if we're on a server or
1647 // workstation edition of Windows. Starting with Windows 8.1 we can't
1648 // trust the OS version information returned by this API.
1649 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1650 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1651 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1652 st->print_cr("Call to GetVersionEx failed");
1653 return;
1654 }
1655 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1656
1657 // Get the full path to \Windows\System32\kernel32.dll and use that for
1658 // determining what version of Windows we're running on.
1659 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1660 ret = GetSystemDirectory(kernel32_path, len);
1661 if (ret == 0 || ret > len) {
1662 st->print_cr("Call to GetSystemDirectory failed");
1663 return;
1664 }
1665 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1666
1667 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1668 if (version_size == 0) {
1669 st->print_cr("Call to GetFileVersionInfoSize failed");
1670 return;
1671 }
1672
1673 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1674 if (version_info == NULL) {
1675 st->print_cr("Failed to allocate version_info");
1676 return;
1677 }
1678
1679 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1680 os::free(version_info);
1681 st->print_cr("Call to GetFileVersionInfo failed");
1682 return;
1683 }
1684
1685 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1686 os::free(version_info);
1687 st->print_cr("Call to VerQueryValue failed");
1688 return;
1689 }
1690
1691 int major_version = HIWORD(file_info->dwProductVersionMS);
1692 int minor_version = LOWORD(file_info->dwProductVersionMS);
1693 int build_number = HIWORD(file_info->dwProductVersionLS);
1694 int build_minor = LOWORD(file_info->dwProductVersionLS);
1695 int os_vers = major_version * 1000 + minor_version;
1696 os::free(version_info);
1697
1698 st->print(" Windows ");
1699 switch (os_vers) {
1700
1701 case 6000:
1702 if (is_workstation) {
1703 st->print("Vista");
1704 } else {
1705 st->print("Server 2008");
1706 }
1707 break;
1708
1709 case 6001:
1710 if (is_workstation) {
1711 st->print("7");
1712 } else {
1713 st->print("Server 2008 R2");
1714 }
1715 break;
1716
1717 case 6002:
1718 if (is_workstation) {
1719 st->print("8");
1720 } else {
1721 st->print("Server 2012");
1722 }
1723 break;
1724
1725 case 6003:
1726 if (is_workstation) {
1727 st->print("8.1");
1728 } else {
1729 st->print("Server 2012 R2");
1730 }
1731 break;
1732
1733 case 10000:
1734 if (is_workstation) {
1735 st->print("10");
1736 } else {
1737 // The server version name of Windows 10 is not known at this time
1738 st->print("%d.%d", major_version, minor_version);
1739 }
1740 break;
1741
1742 default:
1743 // Unrecognized windows, print out its major and minor versions
1744 st->print("%d.%d", major_version, minor_version);
1745 break;
1746 }
1747
1748 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1749 // find out whether we are running on 64 bit processor or not
1750 SYSTEM_INFO si;
1751 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1752 os::Kernel32Dll::GetNativeSystemInfo(&si);
1753 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1754 st->print(" , 64 bit");
1755 }
1756
1757 st->print(" Build %d", build_number);
1758 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1759 st->cr();
1760 }
1761
1762 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1763 // Nothing to do for now.
1764 }
1765
1766 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1767 HKEY key;
1768 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1769 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1770 if (status == ERROR_SUCCESS) {
1771 DWORD size = (DWORD)buflen;
1772 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1773 if (status != ERROR_SUCCESS) {
1774 strncpy(buf, "## __CPU__", buflen);
1775 }
1776 RegCloseKey(key);
1777 } else {
1778 // Put generic cpu info to return
1779 strncpy(buf, "## __CPU__", buflen);
1780 }
1781 }
1782
1783 void os::print_memory_info(outputStream* st) {
1784 st->print("Memory:");
1785 st->print(" %dk page", os::vm_page_size()>>10);
1786
1787 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1788 // value if total memory is larger than 4GB
1789 MEMORYSTATUSEX ms;
1790 ms.dwLength = sizeof(ms);
1791 GlobalMemoryStatusEx(&ms);
1792
1793 st->print(", physical %uk", os::physical_memory() >> 10);
1794 st->print("(%uk free)", os::available_memory() >> 10);
1795
1796 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1797 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1798 st->cr();
1799 }
1800
1801 void os::print_siginfo(outputStream *st, void *siginfo) {
1802 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1803 st->print("siginfo:");
1804
1805 char tmp[64];
1806 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1807 strcpy(tmp, "EXCEPTION_??");
1808 }
1809 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1810
1811 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1812 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1813 er->NumberParameters >= 2) {
1814 switch (er->ExceptionInformation[0]) {
1815 case 0: st->print(", reading address"); break;
1816 case 1: st->print(", writing address"); break;
1817 case 8: st->print(", data execution prevention violation at address"); break;
1818 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1819 er->ExceptionInformation[0]);
1820 }
1821 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1822
1823 if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && UseSharedSpaces) {
1824 FileMapInfo* mapinfo = FileMapInfo::current_info();
1825 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1826 st->print("\n\nError accessing class data sharing archive." \
1827 " Mapped file inaccessible during execution, " \
1828 " possible disk/network problem.");
1829 }
1830 }
1831 } else {
1832 int num = er->NumberParameters;
1833 if (num > 0) {
1834 st->print(", ExceptionInformation=");
1835 for (int i = 0; i < num; i++) {
1836 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1837 }
1838 }
1839 }
1840 st->cr();
1841 }
1842
1843 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1844 // do nothing
1845 }
1846
1847 static char saved_jvm_path[MAX_PATH] = {0};
1848
1849 // Find the full path to the current module, jvm.dll
1850 void os::jvm_path(char *buf, jint buflen) {
1851 // Error checking.
1852 if (buflen < MAX_PATH) {
1853 assert(false, "must use a large-enough buffer");
1854 buf[0] = '\0';
1855 return;
1856 }
1857 // Lazy resolve the path to current module.
1858 if (saved_jvm_path[0] != 0) {
1859 strcpy(buf, saved_jvm_path);
1860 return;
1861 }
1862
1863 buf[0] = '\0';
1864 if (Arguments::sun_java_launcher_is_altjvm()) {
1865 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1866 // for a JAVA_HOME environment variable and fix up the path so it
1867 // looks like jvm.dll is installed there (append a fake suffix
1868 // hotspot/jvm.dll).
1869 char* java_home_var = ::getenv("JAVA_HOME");
1870 if (java_home_var != NULL && java_home_var[0] != 0 &&
1871 strlen(java_home_var) < (size_t)buflen) {
1872 strncpy(buf, java_home_var, buflen);
1873
1874 // determine if this is a legacy image or modules image
1875 // modules image doesn't have "jre" subdirectory
1876 size_t len = strlen(buf);
1877 char* jrebin_p = buf + len;
1878 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1879 if (0 != _access(buf, 0)) {
1880 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1881 }
1882 len = strlen(buf);
1883 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1884 }
1885 }
1886
1887 if (buf[0] == '\0') {
1888 GetModuleFileName(vm_lib_handle, buf, buflen);
1889 }
1890 strncpy(saved_jvm_path, buf, MAX_PATH);
1891 saved_jvm_path[MAX_PATH - 1] = '\0';
1892 }
1893
1894
1895 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1896 #ifndef _WIN64
1897 st->print("_");
1898 #endif
1899 }
1900
1901
1902 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1903 #ifndef _WIN64
1904 st->print("@%d", args_size * sizeof(int));
1905 #endif
1906 }
1907
1908 // This method is a copy of JDK's sysGetLastErrorString
1909 // from src/windows/hpi/src/system_md.c
1910
1911 size_t os::lasterror(char* buf, size_t len) {
1912 DWORD errval;
1913
1914 if ((errval = GetLastError()) != 0) {
1915 // DOS error
1916 size_t n = (size_t)FormatMessage(
1917 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1918 NULL,
1919 errval,
1920 0,
1921 buf,
1922 (DWORD)len,
1923 NULL);
1924 if (n > 3) {
1925 // Drop final '.', CR, LF
1926 if (buf[n - 1] == '\n') n--;
1927 if (buf[n - 1] == '\r') n--;
1928 if (buf[n - 1] == '.') n--;
1929 buf[n] = '\0';
1930 }
1931 return n;
1932 }
1933
1934 if (errno != 0) {
1935 // C runtime error that has no corresponding DOS error code
1936 const char* s = strerror(errno);
1937 size_t n = strlen(s);
1938 if (n >= len) n = len - 1;
1939 strncpy(buf, s, n);
1940 buf[n] = '\0';
1941 return n;
1942 }
1943
1944 return 0;
1945 }
1946
1947 int os::get_last_error() {
1948 DWORD error = GetLastError();
1949 if (error == 0) {
1950 error = errno;
1951 }
1952 return (int)error;
1953 }
1954
1955 WindowsSemaphore::WindowsSemaphore(uint value) {
1956 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1957
1958 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1959 }
1960
1961 WindowsSemaphore::~WindowsSemaphore() {
1962 ::CloseHandle(_semaphore);
1963 }
1964
1965 void WindowsSemaphore::signal(uint count) {
1966 if (count > 0) {
1967 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1968
1969 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1970 }
1971 }
1972
1973 void WindowsSemaphore::wait() {
1974 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1975 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1976 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1977 }
1978
1979 // sun.misc.Signal
1980 // NOTE that this is a workaround for an apparent kernel bug where if
1981 // a signal handler for SIGBREAK is installed then that signal handler
1982 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1983 // See bug 4416763.
1984 static void (*sigbreakHandler)(int) = NULL;
1985
1986 static void UserHandler(int sig, void *siginfo, void *context) {
1987 os::signal_notify(sig);
1988 // We need to reinstate the signal handler each time...
1989 os::signal(sig, (void*)UserHandler);
1990 }
1991
1992 void* os::user_handler() {
1993 return (void*) UserHandler;
1994 }
1995
1996 void* os::signal(int signal_number, void* handler) {
1997 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1998 void (*oldHandler)(int) = sigbreakHandler;
1999 sigbreakHandler = (void (*)(int)) handler;
2000 return (void*) oldHandler;
2001 } else {
2002 return (void*)::signal(signal_number, (void (*)(int))handler);
2003 }
2004 }
2005
2006 void os::signal_raise(int signal_number) {
2007 raise(signal_number);
2008 }
2009
2010 // The Win32 C runtime library maps all console control events other than ^C
2011 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2012 // logoff, and shutdown events. We therefore install our own console handler
2013 // that raises SIGTERM for the latter cases.
2014 //
2015 static BOOL WINAPI consoleHandler(DWORD event) {
2016 switch (event) {
2017 case CTRL_C_EVENT:
2018 if (is_error_reported()) {
2019 // Ctrl-C is pressed during error reporting, likely because the error
2020 // handler fails to abort. Let VM die immediately.
2021 os::die();
2022 }
2023
2024 os::signal_raise(SIGINT);
2025 return TRUE;
2026 break;
2027 case CTRL_BREAK_EVENT:
2028 if (sigbreakHandler != NULL) {
2029 (*sigbreakHandler)(SIGBREAK);
2030 }
2031 return TRUE;
2032 break;
2033 case CTRL_LOGOFF_EVENT: {
2034 // Don't terminate JVM if it is running in a non-interactive session,
2035 // such as a service process.
2036 USEROBJECTFLAGS flags;
2037 HANDLE handle = GetProcessWindowStation();
2038 if (handle != NULL &&
2039 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2040 sizeof(USEROBJECTFLAGS), NULL)) {
2041 // If it is a non-interactive session, let next handler to deal
2042 // with it.
2043 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2044 return FALSE;
2045 }
2046 }
2047 }
2048 case CTRL_CLOSE_EVENT:
2049 case CTRL_SHUTDOWN_EVENT:
2050 os::signal_raise(SIGTERM);
2051 return TRUE;
2052 break;
2053 default:
2054 break;
2055 }
2056 return FALSE;
2057 }
2058
2059 // The following code is moved from os.cpp for making this
2060 // code platform specific, which it is by its very nature.
2061
2062 // Return maximum OS signal used + 1 for internal use only
2063 // Used as exit signal for signal_thread
2064 int os::sigexitnum_pd() {
2065 return NSIG;
2066 }
2067
2068 // a counter for each possible signal value, including signal_thread exit signal
2069 static volatile jint pending_signals[NSIG+1] = { 0 };
2070 static HANDLE sig_sem = NULL;
2071
2072 void os::signal_init_pd() {
2073 // Initialize signal structures
2074 memset((void*)pending_signals, 0, sizeof(pending_signals));
2075
2076 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2077
2078 // Programs embedding the VM do not want it to attempt to receive
2079 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2080 // shutdown hooks mechanism introduced in 1.3. For example, when
2081 // the VM is run as part of a Windows NT service (i.e., a servlet
2082 // engine in a web server), the correct behavior is for any console
2083 // control handler to return FALSE, not TRUE, because the OS's
2084 // "final" handler for such events allows the process to continue if
2085 // it is a service (while terminating it if it is not a service).
2086 // To make this behavior uniform and the mechanism simpler, we
2087 // completely disable the VM's usage of these console events if -Xrs
2088 // (=ReduceSignalUsage) is specified. This means, for example, that
2089 // the CTRL-BREAK thread dump mechanism is also disabled in this
2090 // case. See bugs 4323062, 4345157, and related bugs.
2091
2092 if (!ReduceSignalUsage) {
2093 // Add a CTRL-C handler
2094 SetConsoleCtrlHandler(consoleHandler, TRUE);
2095 }
2096 }
2097
2098 void os::signal_notify(int signal_number) {
2099 BOOL ret;
2100 if (sig_sem != NULL) {
2101 Atomic::inc(&pending_signals[signal_number]);
2102 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2103 assert(ret != 0, "ReleaseSemaphore() failed");
2104 }
2105 }
2106
2107 static int check_pending_signals(bool wait_for_signal) {
2108 DWORD ret;
2109 while (true) {
2110 for (int i = 0; i < NSIG + 1; i++) {
2111 jint n = pending_signals[i];
2112 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2113 return i;
2114 }
2115 }
2116 if (!wait_for_signal) {
2117 return -1;
2118 }
2119
2120 JavaThread *thread = JavaThread::current();
2121
2122 ThreadBlockInVM tbivm(thread);
2123
2124 bool threadIsSuspended;
2125 do {
2126 thread->set_suspend_equivalent();
2127 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2128 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2129 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2130
2131 // were we externally suspended while we were waiting?
2132 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2133 if (threadIsSuspended) {
2134 // The semaphore has been incremented, but while we were waiting
2135 // another thread suspended us. We don't want to continue running
2136 // while suspended because that would surprise the thread that
2137 // suspended us.
2138 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2139 assert(ret != 0, "ReleaseSemaphore() failed");
2140
2141 thread->java_suspend_self();
2142 }
2143 } while (threadIsSuspended);
2144 }
2145 }
2146
2147 int os::signal_lookup() {
2148 return check_pending_signals(false);
2149 }
2150
2151 int os::signal_wait() {
2152 return check_pending_signals(true);
2153 }
2154
2155 // Implicit OS exception handling
2156
2157 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2158 address handler) {
2159 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2160 // Save pc in thread
2161 #ifdef _M_IA64
2162 // Do not blow up if no thread info available.
2163 if (thread) {
2164 // Saving PRECISE pc (with slot information) in thread.
2165 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2166 // Convert precise PC into "Unix" format
2167 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2168 thread->set_saved_exception_pc((address)precise_pc);
2169 }
2170 // Set pc to handler
2171 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2172 // Clear out psr.ri (= Restart Instruction) in order to continue
2173 // at the beginning of the target bundle.
2174 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2175 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2176 #else
2177 #ifdef _M_AMD64
2178 // Do not blow up if no thread info available.
2179 if (thread) {
2180 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2181 }
2182 // Set pc to handler
2183 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2184 #else
2185 // Do not blow up if no thread info available.
2186 if (thread) {
2187 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2188 }
2189 // Set pc to handler
2190 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2191 #endif
2192 #endif
2193
2194 // Continue the execution
2195 return EXCEPTION_CONTINUE_EXECUTION;
2196 }
2197
2198
2199 // Used for PostMortemDump
2200 extern "C" void safepoints();
2201 extern "C" void find(int x);
2202 extern "C" void events();
2203
2204 // According to Windows API documentation, an illegal instruction sequence should generate
2205 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2206 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2207 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2208
2209 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2210
2211 // From "Execution Protection in the Windows Operating System" draft 0.35
2212 // Once a system header becomes available, the "real" define should be
2213 // included or copied here.
2214 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2215
2216 // Handle NAT Bit consumption on IA64.
2217 #ifdef _M_IA64
2218 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2219 #endif
2220
2221 // Windows Vista/2008 heap corruption check
2222 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2223
2224 #define def_excpt(val) #val, val
2225
2226 struct siglabel {
2227 char *name;
2228 int number;
2229 };
2230
2231 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2232 // C++ compiler contain this error code. Because this is a compiler-generated
2233 // error, the code is not listed in the Win32 API header files.
2234 // The code is actually a cryptic mnemonic device, with the initial "E"
2235 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2236 // ASCII values of "msc".
2237
2238 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2239
2240
2241 struct siglabel exceptlabels[] = {
2242 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2243 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2244 def_excpt(EXCEPTION_BREAKPOINT),
2245 def_excpt(EXCEPTION_SINGLE_STEP),
2246 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2247 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2248 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2249 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2250 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2251 def_excpt(EXCEPTION_FLT_OVERFLOW),
2252 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2253 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2254 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2255 def_excpt(EXCEPTION_INT_OVERFLOW),
2256 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2257 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2258 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2259 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2260 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2261 def_excpt(EXCEPTION_STACK_OVERFLOW),
2262 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2263 def_excpt(EXCEPTION_GUARD_PAGE),
2264 def_excpt(EXCEPTION_INVALID_HANDLE),
2265 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2266 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2267 #ifdef _M_IA64
2268 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2269 #endif
2270 NULL, 0
2271 };
2272
2273 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2274 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2275 if (exceptlabels[i].number == exception_code) {
2276 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2277 return buf;
2278 }
2279 }
2280
2281 return NULL;
2282 }
2283
2284 //-----------------------------------------------------------------------------
2285 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2286 // handle exception caused by idiv; should only happen for -MinInt/-1
2287 // (division by zero is handled explicitly)
2288 #ifdef _M_IA64
2289 assert(0, "Fix Handle_IDiv_Exception");
2290 #else
2291 #ifdef _M_AMD64
2292 PCONTEXT ctx = exceptionInfo->ContextRecord;
2293 address pc = (address)ctx->Rip;
2294 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2295 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2296 if (pc[0] == 0xF7) {
2297 // set correct result values and continue after idiv instruction
2298 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2299 } else {
2300 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2301 }
2302 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2303 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2304 // idiv opcode (0xF7).
2305 ctx->Rdx = (DWORD)0; // remainder
2306 // Continue the execution
2307 #else
2308 PCONTEXT ctx = exceptionInfo->ContextRecord;
2309 address pc = (address)ctx->Eip;
2310 assert(pc[0] == 0xF7, "not an idiv opcode");
2311 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2312 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2313 // set correct result values and continue after idiv instruction
2314 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2315 ctx->Eax = (DWORD)min_jint; // result
2316 ctx->Edx = (DWORD)0; // remainder
2317 // Continue the execution
2318 #endif
2319 #endif
2320 return EXCEPTION_CONTINUE_EXECUTION;
2321 }
2322
2323 //-----------------------------------------------------------------------------
2324 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2325 PCONTEXT ctx = exceptionInfo->ContextRecord;
2326 #ifndef _WIN64
2327 // handle exception caused by native method modifying control word
2328 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2329
2330 switch (exception_code) {
2331 case EXCEPTION_FLT_DENORMAL_OPERAND:
2332 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2333 case EXCEPTION_FLT_INEXACT_RESULT:
2334 case EXCEPTION_FLT_INVALID_OPERATION:
2335 case EXCEPTION_FLT_OVERFLOW:
2336 case EXCEPTION_FLT_STACK_CHECK:
2337 case EXCEPTION_FLT_UNDERFLOW:
2338 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2339 if (fp_control_word != ctx->FloatSave.ControlWord) {
2340 // Restore FPCW and mask out FLT exceptions
2341 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2342 // Mask out pending FLT exceptions
2343 ctx->FloatSave.StatusWord &= 0xffffff00;
2344 return EXCEPTION_CONTINUE_EXECUTION;
2345 }
2346 }
2347
2348 if (prev_uef_handler != NULL) {
2349 // We didn't handle this exception so pass it to the previous
2350 // UnhandledExceptionFilter.
2351 return (prev_uef_handler)(exceptionInfo);
2352 }
2353 #else // !_WIN64
2354 // On Windows, the mxcsr control bits are non-volatile across calls
2355 // See also CR 6192333
2356 //
2357 jint MxCsr = INITIAL_MXCSR;
2358 // we can't use StubRoutines::addr_mxcsr_std()
2359 // because in Win64 mxcsr is not saved there
2360 if (MxCsr != ctx->MxCsr) {
2361 ctx->MxCsr = MxCsr;
2362 return EXCEPTION_CONTINUE_EXECUTION;
2363 }
2364 #endif // !_WIN64
2365
2366 return EXCEPTION_CONTINUE_SEARCH;
2367 }
2368
2369 static inline void report_error(Thread* t, DWORD exception_code,
2370 address addr, void* siginfo, void* context) {
2371 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2372
2373 // If UseOsErrorReporting, this will return here and save the error file
2374 // somewhere where we can find it in the minidump.
2375 }
2376
2377 //-----------------------------------------------------------------------------
2378 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2379 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2380 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2381 #ifdef _M_IA64
2382 // On Itanium, we need the "precise pc", which has the slot number coded
2383 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2384 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2385 // Convert the pc to "Unix format", which has the slot number coded
2386 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2387 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2388 // information is saved in the Unix format.
2389 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2390 #else
2391 #ifdef _M_AMD64
2392 address pc = (address) exceptionInfo->ContextRecord->Rip;
2393 #else
2394 address pc = (address) exceptionInfo->ContextRecord->Eip;
2395 #endif
2396 #endif
2397 Thread* t = Thread::current_or_null_safe();
2398
2399 // Handle SafeFetch32 and SafeFetchN exceptions.
2400 if (StubRoutines::is_safefetch_fault(pc)) {
2401 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2402 }
2403
2404 #ifndef _WIN64
2405 // Execution protection violation - win32 running on AMD64 only
2406 // Handled first to avoid misdiagnosis as a "normal" access violation;
2407 // This is safe to do because we have a new/unique ExceptionInformation
2408 // code for this condition.
2409 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2410 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2411 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2412 address addr = (address) exceptionRecord->ExceptionInformation[1];
2413
2414 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2415 int page_size = os::vm_page_size();
2416
2417 // Make sure the pc and the faulting address are sane.
2418 //
2419 // If an instruction spans a page boundary, and the page containing
2420 // the beginning of the instruction is executable but the following
2421 // page is not, the pc and the faulting address might be slightly
2422 // different - we still want to unguard the 2nd page in this case.
2423 //
2424 // 15 bytes seems to be a (very) safe value for max instruction size.
2425 bool pc_is_near_addr =
2426 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2427 bool instr_spans_page_boundary =
2428 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2429 (intptr_t) page_size) > 0);
2430
2431 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2432 static volatile address last_addr =
2433 (address) os::non_memory_address_word();
2434
2435 // In conservative mode, don't unguard unless the address is in the VM
2436 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2437 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2438
2439 // Set memory to RWX and retry
2440 address page_start =
2441 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2442 bool res = os::protect_memory((char*) page_start, page_size,
2443 os::MEM_PROT_RWX);
2444
2445 if (PrintMiscellaneous && Verbose) {
2446 char buf[256];
2447 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2448 "at " INTPTR_FORMAT
2449 ", unguarding " INTPTR_FORMAT ": %s", addr,
2450 page_start, (res ? "success" : strerror(errno)));
2451 tty->print_raw_cr(buf);
2452 }
2453
2454 // Set last_addr so if we fault again at the same address, we don't
2455 // end up in an endless loop.
2456 //
2457 // There are two potential complications here. Two threads trapping
2458 // at the same address at the same time could cause one of the
2459 // threads to think it already unguarded, and abort the VM. Likely
2460 // very rare.
2461 //
2462 // The other race involves two threads alternately trapping at
2463 // different addresses and failing to unguard the page, resulting in
2464 // an endless loop. This condition is probably even more unlikely
2465 // than the first.
2466 //
2467 // Although both cases could be avoided by using locks or thread
2468 // local last_addr, these solutions are unnecessary complication:
2469 // this handler is a best-effort safety net, not a complete solution.
2470 // It is disabled by default and should only be used as a workaround
2471 // in case we missed any no-execute-unsafe VM code.
2472
2473 last_addr = addr;
2474
2475 return EXCEPTION_CONTINUE_EXECUTION;
2476 }
2477 }
2478
2479 // Last unguard failed or not unguarding
2480 tty->print_raw_cr("Execution protection violation");
2481 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2482 exceptionInfo->ContextRecord);
2483 return EXCEPTION_CONTINUE_SEARCH;
2484 }
2485 }
2486 #endif // _WIN64
2487
2488 // Check to see if we caught the safepoint code in the
2489 // process of write protecting the memory serialization page.
2490 // It write enables the page immediately after protecting it
2491 // so just return.
2492 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2493 JavaThread* thread = (JavaThread*) t;
2494 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2495 address addr = (address) exceptionRecord->ExceptionInformation[1];
2496 if (os::is_memory_serialize_page(thread, addr)) {
2497 // Block current thread until the memory serialize page permission restored.
2498 os::block_on_serialize_page_trap();
2499 return EXCEPTION_CONTINUE_EXECUTION;
2500 }
2501 }
2502
2503 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2504 VM_Version::is_cpuinfo_segv_addr(pc)) {
2505 // Verify that OS save/restore AVX registers.
2506 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2507 }
2508
2509 if (t != NULL && t->is_Java_thread()) {
2510 JavaThread* thread = (JavaThread*) t;
2511 bool in_java = thread->thread_state() == _thread_in_Java;
2512
2513 // Handle potential stack overflows up front.
2514 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2515 if (os::uses_stack_guard_pages()) {
2516 #ifdef _M_IA64
2517 // Use guard page for register stack.
2518 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2519 address addr = (address) exceptionRecord->ExceptionInformation[1];
2520 // Check for a register stack overflow on Itanium
2521 if (thread->addr_inside_register_stack_red_zone(addr)) {
2522 // Fatal red zone violation happens if the Java program
2523 // catches a StackOverflow error and does so much processing
2524 // that it runs beyond the unprotected yellow guard zone. As
2525 // a result, we are out of here.
2526 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2527 } else if(thread->addr_inside_register_stack(addr)) {
2528 // Disable the yellow zone which sets the state that
2529 // we've got a stack overflow problem.
2530 if (thread->stack_yellow_zone_enabled()) {
2531 thread->disable_stack_yellow_zone();
2532 }
2533 // Give us some room to process the exception.
2534 thread->disable_register_stack_guard();
2535 // Tracing with +Verbose.
2536 if (Verbose) {
2537 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2538 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2539 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2540 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2541 thread->register_stack_base(),
2542 thread->register_stack_base() + thread->stack_size());
2543 }
2544
2545 // Reguard the permanent register stack red zone just to be sure.
2546 // We saw Windows silently disabling this without telling us.
2547 thread->enable_register_stack_red_zone();
2548
2549 return Handle_Exception(exceptionInfo,
2550 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2551 }
2552 #endif
2553 if (thread->stack_yellow_zone_enabled()) {
2554 // Yellow zone violation. The o/s has unprotected the first yellow
2555 // zone page for us. Note: must call disable_stack_yellow_zone to
2556 // update the enabled status, even if the zone contains only one page.
2557 thread->disable_stack_yellow_zone();
2558 // If not in java code, return and hope for the best.
2559 return in_java
2560 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2561 : EXCEPTION_CONTINUE_EXECUTION;
2562 } else {
2563 // Fatal red zone violation.
2564 thread->disable_stack_red_zone();
2565 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2566 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2567 exceptionInfo->ContextRecord);
2568 return EXCEPTION_CONTINUE_SEARCH;
2569 }
2570 } else if (in_java) {
2571 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2572 // a one-time-only guard page, which it has released to us. The next
2573 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2574 return Handle_Exception(exceptionInfo,
2575 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2576 } else {
2577 // Can only return and hope for the best. Further stack growth will
2578 // result in an ACCESS_VIOLATION.
2579 return EXCEPTION_CONTINUE_EXECUTION;
2580 }
2581 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2582 // Either stack overflow or null pointer exception.
2583 if (in_java) {
2584 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2585 address addr = (address) exceptionRecord->ExceptionInformation[1];
2586 address stack_end = thread->stack_base() - thread->stack_size();
2587 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2588 // Stack overflow.
2589 assert(!os::uses_stack_guard_pages(),
2590 "should be caught by red zone code above.");
2591 return Handle_Exception(exceptionInfo,
2592 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2593 }
2594 // Check for safepoint polling and implicit null
2595 // We only expect null pointers in the stubs (vtable)
2596 // the rest are checked explicitly now.
2597 CodeBlob* cb = CodeCache::find_blob(pc);
2598 if (cb != NULL) {
2599 if (os::is_poll_address(addr)) {
2600 address stub = SharedRuntime::get_poll_stub(pc);
2601 return Handle_Exception(exceptionInfo, stub);
2602 }
2603 }
2604 {
2605 #ifdef _WIN64
2606 // If it's a legal stack address map the entire region in
2607 //
2608 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2609 address addr = (address) exceptionRecord->ExceptionInformation[1];
2610 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2611 addr = (address)((uintptr_t)addr &
2612 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2613 os::commit_memory((char *)addr, thread->stack_base() - addr,
2614 !ExecMem);
2615 return EXCEPTION_CONTINUE_EXECUTION;
2616 } else
2617 #endif
2618 {
2619 // Null pointer exception.
2620 #ifdef _M_IA64
2621 // Process implicit null checks in compiled code. Note: Implicit null checks
2622 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2623 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2624 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2625 // Handle implicit null check in UEP method entry
2626 if (cb && (cb->is_frame_complete_at(pc) ||
2627 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2628 if (Verbose) {
2629 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2630 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2631 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2632 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2633 *(bundle_start + 1), *bundle_start);
2634 }
2635 return Handle_Exception(exceptionInfo,
2636 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2637 }
2638 }
2639
2640 // Implicit null checks were processed above. Hence, we should not reach
2641 // here in the usual case => die!
2642 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2643 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2644 exceptionInfo->ContextRecord);
2645 return EXCEPTION_CONTINUE_SEARCH;
2646
2647 #else // !IA64
2648
2649 // Windows 98 reports faulting addresses incorrectly
2650 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2651 !os::win32::is_nt()) {
2652 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2653 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2654 }
2655 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2656 exceptionInfo->ContextRecord);
2657 return EXCEPTION_CONTINUE_SEARCH;
2658 #endif
2659 }
2660 }
2661 }
2662
2663 #ifdef _WIN64
2664 // Special care for fast JNI field accessors.
2665 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2666 // in and the heap gets shrunk before the field access.
2667 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2668 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2669 if (addr != (address)-1) {
2670 return Handle_Exception(exceptionInfo, addr);
2671 }
2672 }
2673 #endif
2674
2675 // Stack overflow or null pointer exception in native code.
2676 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2677 exceptionInfo->ContextRecord);
2678 return EXCEPTION_CONTINUE_SEARCH;
2679 } // /EXCEPTION_ACCESS_VIOLATION
2680 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2681 #if defined _M_IA64
2682 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2683 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2684 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2685
2686 // Compiled method patched to be non entrant? Following conditions must apply:
2687 // 1. must be first instruction in bundle
2688 // 2. must be a break instruction with appropriate code
2689 if ((((uint64_t) pc & 0x0F) == 0) &&
2690 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2691 return Handle_Exception(exceptionInfo,
2692 (address)SharedRuntime::get_handle_wrong_method_stub());
2693 }
2694 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2695 #endif
2696
2697
2698 if (in_java) {
2699 switch (exception_code) {
2700 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2701 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2702
2703 case EXCEPTION_INT_OVERFLOW:
2704 return Handle_IDiv_Exception(exceptionInfo);
2705
2706 } // switch
2707 }
2708 if (((thread->thread_state() == _thread_in_Java) ||
2709 (thread->thread_state() == _thread_in_native)) &&
2710 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2711 LONG result=Handle_FLT_Exception(exceptionInfo);
2712 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2713 }
2714 }
2715
2716 if (exception_code != EXCEPTION_BREAKPOINT) {
2717 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2718 exceptionInfo->ContextRecord);
2719 }
2720 return EXCEPTION_CONTINUE_SEARCH;
2721 }
2722
2723 #ifndef _WIN64
2724 // Special care for fast JNI accessors.
2725 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2726 // the heap gets shrunk before the field access.
2727 // Need to install our own structured exception handler since native code may
2728 // install its own.
2729 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2730 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2731 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2732 address pc = (address) exceptionInfo->ContextRecord->Eip;
2733 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2734 if (addr != (address)-1) {
2735 return Handle_Exception(exceptionInfo, addr);
2736 }
2737 }
2738 return EXCEPTION_CONTINUE_SEARCH;
2739 }
2740
2741 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2742 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2743 jobject obj, \
2744 jfieldID fieldID) { \
2745 __try { \
2746 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2747 obj, \
2748 fieldID); \
2749 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2750 _exception_info())) { \
2751 } \
2752 return 0; \
2753 }
2754
2755 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2756 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2757 DEFINE_FAST_GETFIELD(jchar, char, Char)
2758 DEFINE_FAST_GETFIELD(jshort, short, Short)
2759 DEFINE_FAST_GETFIELD(jint, int, Int)
2760 DEFINE_FAST_GETFIELD(jlong, long, Long)
2761 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2762 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2763
2764 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2765 switch (type) {
2766 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2767 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2768 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2769 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2770 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2771 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2772 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2773 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2774 default: ShouldNotReachHere();
2775 }
2776 return (address)-1;
2777 }
2778 #endif
2779
2780 // Virtual Memory
2781
2782 int os::vm_page_size() { return os::win32::vm_page_size(); }
2783 int os::vm_allocation_granularity() {
2784 return os::win32::vm_allocation_granularity();
2785 }
2786
2787 // Windows large page support is available on Windows 2003. In order to use
2788 // large page memory, the administrator must first assign additional privilege
2789 // to the user:
2790 // + select Control Panel -> Administrative Tools -> Local Security Policy
2791 // + select Local Policies -> User Rights Assignment
2792 // + double click "Lock pages in memory", add users and/or groups
2793 // + reboot
2794 // Note the above steps are needed for administrator as well, as administrators
2795 // by default do not have the privilege to lock pages in memory.
2796 //
2797 // Note about Windows 2003: although the API supports committing large page
2798 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2799 // scenario, I found through experiment it only uses large page if the entire
2800 // memory region is reserved and committed in a single VirtualAlloc() call.
2801 // This makes Windows large page support more or less like Solaris ISM, in
2802 // that the entire heap must be committed upfront. This probably will change
2803 // in the future, if so the code below needs to be revisited.
2804
2805 #ifndef MEM_LARGE_PAGES
2806 #define MEM_LARGE_PAGES 0x20000000
2807 #endif
2808
2809 static HANDLE _hProcess;
2810 static HANDLE _hToken;
2811
2812 // Container for NUMA node list info
2813 class NUMANodeListHolder {
2814 private:
2815 int *_numa_used_node_list; // allocated below
2816 int _numa_used_node_count;
2817
2818 void free_node_list() {
2819 if (_numa_used_node_list != NULL) {
2820 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2821 }
2822 }
2823
2824 public:
2825 NUMANodeListHolder() {
2826 _numa_used_node_count = 0;
2827 _numa_used_node_list = NULL;
2828 // do rest of initialization in build routine (after function pointers are set up)
2829 }
2830
2831 ~NUMANodeListHolder() {
2832 free_node_list();
2833 }
2834
2835 bool build() {
2836 DWORD_PTR proc_aff_mask;
2837 DWORD_PTR sys_aff_mask;
2838 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2839 ULONG highest_node_number;
2840 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2841 free_node_list();
2842 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2843 for (unsigned int i = 0; i <= highest_node_number; i++) {
2844 ULONGLONG proc_mask_numa_node;
2845 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2846 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2847 _numa_used_node_list[_numa_used_node_count++] = i;
2848 }
2849 }
2850 return (_numa_used_node_count > 1);
2851 }
2852
2853 int get_count() { return _numa_used_node_count; }
2854 int get_node_list_entry(int n) {
2855 // for indexes out of range, returns -1
2856 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2857 }
2858
2859 } numa_node_list_holder;
2860
2861
2862
2863 static size_t _large_page_size = 0;
2864
2865 static bool resolve_functions_for_large_page_init() {
2866 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2867 os::Advapi32Dll::AdvapiAvailable();
2868 }
2869
2870 static bool request_lock_memory_privilege() {
2871 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2872 os::current_process_id());
2873
2874 LUID luid;
2875 if (_hProcess != NULL &&
2876 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2877 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2878
2879 TOKEN_PRIVILEGES tp;
2880 tp.PrivilegeCount = 1;
2881 tp.Privileges[0].Luid = luid;
2882 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2883
2884 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2885 // privilege. Check GetLastError() too. See MSDN document.
2886 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2887 (GetLastError() == ERROR_SUCCESS)) {
2888 return true;
2889 }
2890 }
2891
2892 return false;
2893 }
2894
2895 static void cleanup_after_large_page_init() {
2896 if (_hProcess) CloseHandle(_hProcess);
2897 _hProcess = NULL;
2898 if (_hToken) CloseHandle(_hToken);
2899 _hToken = NULL;
2900 }
2901
2902 static bool numa_interleaving_init() {
2903 bool success = false;
2904 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2905
2906 // print a warning if UseNUMAInterleaving flag is specified on command line
2907 bool warn_on_failure = use_numa_interleaving_specified;
2908 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2909
2910 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2911 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2912 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2913
2914 if (os::Kernel32Dll::NumaCallsAvailable()) {
2915 if (numa_node_list_holder.build()) {
2916 if (PrintMiscellaneous && Verbose) {
2917 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2918 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2919 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2920 }
2921 tty->print("\n");
2922 }
2923 success = true;
2924 } else {
2925 WARN("Process does not cover multiple NUMA nodes.");
2926 }
2927 } else {
2928 WARN("NUMA Interleaving is not supported by the operating system.");
2929 }
2930 if (!success) {
2931 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2932 }
2933 return success;
2934 #undef WARN
2935 }
2936
2937 // this routine is used whenever we need to reserve a contiguous VA range
2938 // but we need to make separate VirtualAlloc calls for each piece of the range
2939 // Reasons for doing this:
2940 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2941 // * UseNUMAInterleaving requires a separate node for each piece
2942 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2943 DWORD prot,
2944 bool should_inject_error = false) {
2945 char * p_buf;
2946 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2947 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2948 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2949
2950 // first reserve enough address space in advance since we want to be
2951 // able to break a single contiguous virtual address range into multiple
2952 // large page commits but WS2003 does not allow reserving large page space
2953 // so we just use 4K pages for reserve, this gives us a legal contiguous
2954 // address space. then we will deallocate that reservation, and re alloc
2955 // using large pages
2956 const size_t size_of_reserve = bytes + chunk_size;
2957 if (bytes > size_of_reserve) {
2958 // Overflowed.
2959 return NULL;
2960 }
2961 p_buf = (char *) VirtualAlloc(addr,
2962 size_of_reserve, // size of Reserve
2963 MEM_RESERVE,
2964 PAGE_READWRITE);
2965 // If reservation failed, return NULL
2966 if (p_buf == NULL) return NULL;
2967 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2968 os::release_memory(p_buf, bytes + chunk_size);
2969
2970 // we still need to round up to a page boundary (in case we are using large pages)
2971 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2972 // instead we handle this in the bytes_to_rq computation below
2973 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2974
2975 // now go through and allocate one chunk at a time until all bytes are
2976 // allocated
2977 size_t bytes_remaining = bytes;
2978 // An overflow of align_size_up() would have been caught above
2979 // in the calculation of size_of_reserve.
2980 char * next_alloc_addr = p_buf;
2981 HANDLE hProc = GetCurrentProcess();
2982
2983 #ifdef ASSERT
2984 // Variable for the failure injection
2985 long ran_num = os::random();
2986 size_t fail_after = ran_num % bytes;
2987 #endif
2988
2989 int count=0;
2990 while (bytes_remaining) {
2991 // select bytes_to_rq to get to the next chunk_size boundary
2992
2993 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2994 // Note allocate and commit
2995 char * p_new;
2996
2997 #ifdef ASSERT
2998 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2999 #else
3000 const bool inject_error_now = false;
3001 #endif
3002
3003 if (inject_error_now) {
3004 p_new = NULL;
3005 } else {
3006 if (!UseNUMAInterleaving) {
3007 p_new = (char *) VirtualAlloc(next_alloc_addr,
3008 bytes_to_rq,
3009 flags,
3010 prot);
3011 } else {
3012 // get the next node to use from the used_node_list
3013 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3014 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3015 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3016 next_alloc_addr,
3017 bytes_to_rq,
3018 flags,
3019 prot,
3020 node);
3021 }
3022 }
3023
3024 if (p_new == NULL) {
3025 // Free any allocated pages
3026 if (next_alloc_addr > p_buf) {
3027 // Some memory was committed so release it.
3028 size_t bytes_to_release = bytes - bytes_remaining;
3029 // NMT has yet to record any individual blocks, so it
3030 // need to create a dummy 'reserve' record to match
3031 // the release.
3032 MemTracker::record_virtual_memory_reserve((address)p_buf,
3033 bytes_to_release, CALLER_PC);
3034 os::release_memory(p_buf, bytes_to_release);
3035 }
3036 #ifdef ASSERT
3037 if (should_inject_error) {
3038 if (TracePageSizes && Verbose) {
3039 tty->print_cr("Reserving pages individually failed.");
3040 }
3041 }
3042 #endif
3043 return NULL;
3044 }
3045
3046 bytes_remaining -= bytes_to_rq;
3047 next_alloc_addr += bytes_to_rq;
3048 count++;
3049 }
3050 // Although the memory is allocated individually, it is returned as one.
3051 // NMT records it as one block.
3052 if ((flags & MEM_COMMIT) != 0) {
3053 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3054 } else {
3055 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3056 }
3057
3058 // made it this far, success
3059 return p_buf;
3060 }
3061
3062
3063
3064 void os::large_page_init() {
3065 if (!UseLargePages) return;
3066
3067 // print a warning if any large page related flag is specified on command line
3068 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3069 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3070 bool success = false;
3071
3072 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3073 if (resolve_functions_for_large_page_init()) {
3074 if (request_lock_memory_privilege()) {
3075 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3076 if (s) {
3077 #if defined(IA32) || defined(AMD64)
3078 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3079 WARN("JVM cannot use large pages bigger than 4mb.");
3080 } else {
3081 #endif
3082 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3083 _large_page_size = LargePageSizeInBytes;
3084 } else {
3085 _large_page_size = s;
3086 }
3087 success = true;
3088 #if defined(IA32) || defined(AMD64)
3089 }
3090 #endif
3091 } else {
3092 WARN("Large page is not supported by the processor.");
3093 }
3094 } else {
3095 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3096 }
3097 } else {
3098 WARN("Large page is not supported by the operating system.");
3099 }
3100 #undef WARN
3101
3102 const size_t default_page_size = (size_t) vm_page_size();
3103 if (success && _large_page_size > default_page_size) {
3104 _page_sizes[0] = _large_page_size;
3105 _page_sizes[1] = default_page_size;
3106 _page_sizes[2] = 0;
3107 }
3108
3109 cleanup_after_large_page_init();
3110 UseLargePages = success;
3111 }
3112
3113 // On win32, one cannot release just a part of reserved memory, it's an
3114 // all or nothing deal. When we split a reservation, we must break the
3115 // reservation into two reservations.
3116 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3117 bool realloc) {
3118 if (size > 0) {
3119 release_memory(base, size);
3120 if (realloc) {
3121 reserve_memory(split, base);
3122 }
3123 if (size != split) {
3124 reserve_memory(size - split, base + split);
3125 }
3126 }
3127 }
3128
3129 // Multiple threads can race in this code but it's not possible to unmap small sections of
3130 // virtual space to get requested alignment, like posix-like os's.
3131 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3132 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3133 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3134 "Alignment must be a multiple of allocation granularity (page size)");
3135 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3136
3137 size_t extra_size = size + alignment;
3138 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3139
3140 char* aligned_base = NULL;
3141
3142 do {
3143 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3144 if (extra_base == NULL) {
3145 return NULL;
3146 }
3147 // Do manual alignment
3148 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3149
3150 os::release_memory(extra_base, extra_size);
3151
3152 aligned_base = os::reserve_memory(size, aligned_base);
3153
3154 } while (aligned_base == NULL);
3155
3156 return aligned_base;
3157 }
3158
3159 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3160 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3161 "reserve alignment");
3162 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3163 char* res;
3164 // note that if UseLargePages is on, all the areas that require interleaving
3165 // will go thru reserve_memory_special rather than thru here.
3166 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3167 if (!use_individual) {
3168 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3169 } else {
3170 elapsedTimer reserveTimer;
3171 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3172 // in numa interleaving, we have to allocate pages individually
3173 // (well really chunks of NUMAInterleaveGranularity size)
3174 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3175 if (res == NULL) {
3176 warning("NUMA page allocation failed");
3177 }
3178 if (Verbose && PrintMiscellaneous) {
3179 reserveTimer.stop();
3180 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3181 reserveTimer.milliseconds(), reserveTimer.ticks());
3182 }
3183 }
3184 assert(res == NULL || addr == NULL || addr == res,
3185 "Unexpected address from reserve.");
3186
3187 return res;
3188 }
3189
3190 // Reserve memory at an arbitrary address, only if that area is
3191 // available (and not reserved for something else).
3192 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3193 // Windows os::reserve_memory() fails of the requested address range is
3194 // not avilable.
3195 return reserve_memory(bytes, requested_addr);
3196 }
3197
3198 size_t os::large_page_size() {
3199 return _large_page_size;
3200 }
3201
3202 bool os::can_commit_large_page_memory() {
3203 // Windows only uses large page memory when the entire region is reserved
3204 // and committed in a single VirtualAlloc() call. This may change in the
3205 // future, but with Windows 2003 it's not possible to commit on demand.
3206 return false;
3207 }
3208
3209 bool os::can_execute_large_page_memory() {
3210 return true;
3211 }
3212
3213 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3214 bool exec) {
3215 assert(UseLargePages, "only for large pages");
3216
3217 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3218 return NULL; // Fallback to small pages.
3219 }
3220
3221 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3222 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3223
3224 // with large pages, there are two cases where we need to use Individual Allocation
3225 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3226 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3227 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3228 if (TracePageSizes && Verbose) {
3229 tty->print_cr("Reserving large pages individually.");
3230 }
3231 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3232 if (p_buf == NULL) {
3233 // give an appropriate warning message
3234 if (UseNUMAInterleaving) {
3235 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3236 }
3237 if (UseLargePagesIndividualAllocation) {
3238 warning("Individually allocated large pages failed, "
3239 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3240 }
3241 return NULL;
3242 }
3243
3244 return p_buf;
3245
3246 } else {
3247 if (TracePageSizes && Verbose) {
3248 tty->print_cr("Reserving large pages in a single large chunk.");
3249 }
3250 // normal policy just allocate it all at once
3251 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3252 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3253 if (res != NULL) {
3254 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3255 }
3256
3257 return res;
3258 }
3259 }
3260
3261 bool os::release_memory_special(char* base, size_t bytes) {
3262 assert(base != NULL, "Sanity check");
3263 return release_memory(base, bytes);
3264 }
3265
3266 void os::print_statistics() {
3267 }
3268
3269 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3270 int err = os::get_last_error();
3271 char buf[256];
3272 size_t buf_len = os::lasterror(buf, sizeof(buf));
3273 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3274 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3275 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3276 }
3277
3278 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3279 if (bytes == 0) {
3280 // Don't bother the OS with noops.
3281 return true;
3282 }
3283 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3284 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3285 // Don't attempt to print anything if the OS call fails. We're
3286 // probably low on resources, so the print itself may cause crashes.
3287
3288 // unless we have NUMAInterleaving enabled, the range of a commit
3289 // is always within a reserve covered by a single VirtualAlloc
3290 // in that case we can just do a single commit for the requested size
3291 if (!UseNUMAInterleaving) {
3292 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3293 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3294 return false;
3295 }
3296 if (exec) {
3297 DWORD oldprot;
3298 // Windows doc says to use VirtualProtect to get execute permissions
3299 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3300 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3301 return false;
3302 }
3303 }
3304 return true;
3305 } else {
3306
3307 // when NUMAInterleaving is enabled, the commit might cover a range that
3308 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3309 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3310 // returns represents the number of bytes that can be committed in one step.
3311 size_t bytes_remaining = bytes;
3312 char * next_alloc_addr = addr;
3313 while (bytes_remaining > 0) {
3314 MEMORY_BASIC_INFORMATION alloc_info;
3315 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3316 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3317 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3318 PAGE_READWRITE) == NULL) {
3319 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3320 exec);)
3321 return false;
3322 }
3323 if (exec) {
3324 DWORD oldprot;
3325 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3326 PAGE_EXECUTE_READWRITE, &oldprot)) {
3327 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3328 exec);)
3329 return false;
3330 }
3331 }
3332 bytes_remaining -= bytes_to_rq;
3333 next_alloc_addr += bytes_to_rq;
3334 }
3335 }
3336 // if we made it this far, return true
3337 return true;
3338 }
3339
3340 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3341 bool exec) {
3342 // alignment_hint is ignored on this OS
3343 return pd_commit_memory(addr, size, exec);
3344 }
3345
3346 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3347 const char* mesg) {
3348 assert(mesg != NULL, "mesg must be specified");
3349 if (!pd_commit_memory(addr, size, exec)) {
3350 warn_fail_commit_memory(addr, size, exec);
3351 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3352 }
3353 }
3354
3355 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3356 size_t alignment_hint, bool exec,
3357 const char* mesg) {
3358 // alignment_hint is ignored on this OS
3359 pd_commit_memory_or_exit(addr, size, exec, mesg);
3360 }
3361
3362 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3363 if (bytes == 0) {
3364 // Don't bother the OS with noops.
3365 return true;
3366 }
3367 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3368 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3369 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3370 }
3371
3372 bool os::pd_release_memory(char* addr, size_t bytes) {
3373 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3374 }
3375
3376 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3377 return os::commit_memory(addr, size, !ExecMem);
3378 }
3379
3380 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3381 return os::uncommit_memory(addr, size);
3382 }
3383
3384 // Set protections specified
3385 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3386 bool is_committed) {
3387 unsigned int p = 0;
3388 switch (prot) {
3389 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3390 case MEM_PROT_READ: p = PAGE_READONLY; break;
3391 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3392 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3393 default:
3394 ShouldNotReachHere();
3395 }
3396
3397 DWORD old_status;
3398
3399 // Strange enough, but on Win32 one can change protection only for committed
3400 // memory, not a big deal anyway, as bytes less or equal than 64K
3401 if (!is_committed) {
3402 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3403 "cannot commit protection page");
3404 }
3405 // One cannot use os::guard_memory() here, as on Win32 guard page
3406 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3407 //
3408 // Pages in the region become guard pages. Any attempt to access a guard page
3409 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3410 // the guard page status. Guard pages thus act as a one-time access alarm.
3411 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3412 }
3413
3414 bool os::guard_memory(char* addr, size_t bytes) {
3415 DWORD old_status;
3416 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3417 }
3418
3419 bool os::unguard_memory(char* addr, size_t bytes) {
3420 DWORD old_status;
3421 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3422 }
3423
3424 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3425 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3426 void os::numa_make_global(char *addr, size_t bytes) { }
3427 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3428 bool os::numa_topology_changed() { return false; }
3429 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3430 int os::numa_get_group_id() { return 0; }
3431 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3432 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3433 // Provide an answer for UMA systems
3434 ids[0] = 0;
3435 return 1;
3436 } else {
3437 // check for size bigger than actual groups_num
3438 size = MIN2(size, numa_get_groups_num());
3439 for (int i = 0; i < (int)size; i++) {
3440 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3441 }
3442 return size;
3443 }
3444 }
3445
3446 bool os::get_page_info(char *start, page_info* info) {
3447 return false;
3448 }
3449
3450 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3451 page_info* page_found) {
3452 return end;
3453 }
3454
3455 char* os::non_memory_address_word() {
3456 // Must never look like an address returned by reserve_memory,
3457 // even in its subfields (as defined by the CPU immediate fields,
3458 // if the CPU splits constants across multiple instructions).
3459 return (char*)-1;
3460 }
3461
3462 #define MAX_ERROR_COUNT 100
3463 #define SYS_THREAD_ERROR 0xffffffffUL
3464
3465 void os::pd_start_thread(Thread* thread) {
3466 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3467 // Returns previous suspend state:
3468 // 0: Thread was not suspended
3469 // 1: Thread is running now
3470 // >1: Thread is still suspended.
3471 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3472 }
3473
3474 class HighResolutionInterval : public CHeapObj<mtThread> {
3475 // The default timer resolution seems to be 10 milliseconds.
3476 // (Where is this written down?)
3477 // If someone wants to sleep for only a fraction of the default,
3478 // then we set the timer resolution down to 1 millisecond for
3479 // the duration of their interval.
3480 // We carefully set the resolution back, since otherwise we
3481 // seem to incur an overhead (3%?) that we don't need.
3482 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3483 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3484 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3485 // timeBeginPeriod() if the relative error exceeded some threshold.
3486 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3487 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3488 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3489 // resolution timers running.
3490 private:
3491 jlong resolution;
3492 public:
3493 HighResolutionInterval(jlong ms) {
3494 resolution = ms % 10L;
3495 if (resolution != 0) {
3496 MMRESULT result = timeBeginPeriod(1L);
3497 }
3498 }
3499 ~HighResolutionInterval() {
3500 if (resolution != 0) {
3501 MMRESULT result = timeEndPeriod(1L);
3502 }
3503 resolution = 0L;
3504 }
3505 };
3506
3507 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3508 jlong limit = (jlong) MAXDWORD;
3509
3510 while (ms > limit) {
3511 int res;
3512 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3513 return res;
3514 }
3515 ms -= limit;
3516 }
3517
3518 assert(thread == Thread::current(), "thread consistency check");
3519 OSThread* osthread = thread->osthread();
3520 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3521 int result;
3522 if (interruptable) {
3523 assert(thread->is_Java_thread(), "must be java thread");
3524 JavaThread *jt = (JavaThread *) thread;
3525 ThreadBlockInVM tbivm(jt);
3526
3527 jt->set_suspend_equivalent();
3528 // cleared by handle_special_suspend_equivalent_condition() or
3529 // java_suspend_self() via check_and_wait_while_suspended()
3530
3531 HANDLE events[1];
3532 events[0] = osthread->interrupt_event();
3533 HighResolutionInterval *phri=NULL;
3534 if (!ForceTimeHighResolution) {
3535 phri = new HighResolutionInterval(ms);
3536 }
3537 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3538 result = OS_TIMEOUT;
3539 } else {
3540 ResetEvent(osthread->interrupt_event());
3541 osthread->set_interrupted(false);
3542 result = OS_INTRPT;
3543 }
3544 delete phri; //if it is NULL, harmless
3545
3546 // were we externally suspended while we were waiting?
3547 jt->check_and_wait_while_suspended();
3548 } else {
3549 assert(!thread->is_Java_thread(), "must not be java thread");
3550 Sleep((long) ms);
3551 result = OS_TIMEOUT;
3552 }
3553 return result;
3554 }
3555
3556 // Short sleep, direct OS call.
3557 //
3558 // ms = 0, means allow others (if any) to run.
3559 //
3560 void os::naked_short_sleep(jlong ms) {
3561 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3562 Sleep(ms);
3563 }
3564
3565 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3566 void os::infinite_sleep() {
3567 while (true) { // sleep forever ...
3568 Sleep(100000); // ... 100 seconds at a time
3569 }
3570 }
3571
3572 typedef BOOL (WINAPI * STTSignature)(void);
3573
3574 void os::naked_yield() {
3575 // Use either SwitchToThread() or Sleep(0)
3576 // Consider passing back the return value from SwitchToThread().
3577 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3578 SwitchToThread();
3579 } else {
3580 Sleep(0);
3581 }
3582 }
3583
3584 // Win32 only gives you access to seven real priorities at a time,
3585 // so we compress Java's ten down to seven. It would be better
3586 // if we dynamically adjusted relative priorities.
3587
3588 int os::java_to_os_priority[CriticalPriority + 1] = {
3589 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3590 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3591 THREAD_PRIORITY_LOWEST, // 2
3592 THREAD_PRIORITY_BELOW_NORMAL, // 3
3593 THREAD_PRIORITY_BELOW_NORMAL, // 4
3594 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3595 THREAD_PRIORITY_NORMAL, // 6
3596 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3597 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3598 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3599 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3600 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3601 };
3602
3603 int prio_policy1[CriticalPriority + 1] = {
3604 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3605 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3606 THREAD_PRIORITY_LOWEST, // 2
3607 THREAD_PRIORITY_BELOW_NORMAL, // 3
3608 THREAD_PRIORITY_BELOW_NORMAL, // 4
3609 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3610 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3611 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3612 THREAD_PRIORITY_HIGHEST, // 8
3613 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3614 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3615 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3616 };
3617
3618 static int prio_init() {
3619 // If ThreadPriorityPolicy is 1, switch tables
3620 if (ThreadPriorityPolicy == 1) {
3621 int i;
3622 for (i = 0; i < CriticalPriority + 1; i++) {
3623 os::java_to_os_priority[i] = prio_policy1[i];
3624 }
3625 }
3626 if (UseCriticalJavaThreadPriority) {
3627 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3628 }
3629 return 0;
3630 }
3631
3632 OSReturn os::set_native_priority(Thread* thread, int priority) {
3633 if (!UseThreadPriorities) return OS_OK;
3634 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3635 return ret ? OS_OK : OS_ERR;
3636 }
3637
3638 OSReturn os::get_native_priority(const Thread* const thread,
3639 int* priority_ptr) {
3640 if (!UseThreadPriorities) {
3641 *priority_ptr = java_to_os_priority[NormPriority];
3642 return OS_OK;
3643 }
3644 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3645 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3646 assert(false, "GetThreadPriority failed");
3647 return OS_ERR;
3648 }
3649 *priority_ptr = os_prio;
3650 return OS_OK;
3651 }
3652
3653
3654 // Hint to the underlying OS that a task switch would not be good.
3655 // Void return because it's a hint and can fail.
3656 void os::hint_no_preempt() {}
3657
3658 void os::interrupt(Thread* thread) {
3659 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3660 Threads_lock->owned_by_self(),
3661 "possibility of dangling Thread pointer");
3662
3663 OSThread* osthread = thread->osthread();
3664 osthread->set_interrupted(true);
3665 // More than one thread can get here with the same value of osthread,
3666 // resulting in multiple notifications. We do, however, want the store
3667 // to interrupted() to be visible to other threads before we post
3668 // the interrupt event.
3669 OrderAccess::release();
3670 SetEvent(osthread->interrupt_event());
3671 // For JSR166: unpark after setting status
3672 if (thread->is_Java_thread()) {
3673 ((JavaThread*)thread)->parker()->unpark();
3674 }
3675
3676 ParkEvent * ev = thread->_ParkEvent;
3677 if (ev != NULL) ev->unpark();
3678 }
3679
3680
3681 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3682 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3683 "possibility of dangling Thread pointer");
3684
3685 OSThread* osthread = thread->osthread();
3686 // There is no synchronization between the setting of the interrupt
3687 // and it being cleared here. It is critical - see 6535709 - that
3688 // we only clear the interrupt state, and reset the interrupt event,
3689 // if we are going to report that we were indeed interrupted - else
3690 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3691 // depending on the timing. By checking thread interrupt event to see
3692 // if the thread gets real interrupt thus prevent spurious wakeup.
3693 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3694 if (interrupted && clear_interrupted) {
3695 osthread->set_interrupted(false);
3696 ResetEvent(osthread->interrupt_event());
3697 } // Otherwise leave the interrupted state alone
3698
3699 return interrupted;
3700 }
3701
3702 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3703 ExtendedPC os::get_thread_pc(Thread* thread) {
3704 CONTEXT context;
3705 context.ContextFlags = CONTEXT_CONTROL;
3706 HANDLE handle = thread->osthread()->thread_handle();
3707 #ifdef _M_IA64
3708 assert(0, "Fix get_thread_pc");
3709 return ExtendedPC(NULL);
3710 #else
3711 if (GetThreadContext(handle, &context)) {
3712 #ifdef _M_AMD64
3713 return ExtendedPC((address) context.Rip);
3714 #else
3715 return ExtendedPC((address) context.Eip);
3716 #endif
3717 } else {
3718 return ExtendedPC(NULL);
3719 }
3720 #endif
3721 }
3722
3723 // GetCurrentThreadId() returns DWORD
3724 intx os::current_thread_id() { return GetCurrentThreadId(); }
3725
3726 static int _initial_pid = 0;
3727
3728 int os::current_process_id() {
3729 return (_initial_pid ? _initial_pid : _getpid());
3730 }
3731
3732 int os::win32::_vm_page_size = 0;
3733 int os::win32::_vm_allocation_granularity = 0;
3734 int os::win32::_processor_type = 0;
3735 // Processor level is not available on non-NT systems, use vm_version instead
3736 int os::win32::_processor_level = 0;
3737 julong os::win32::_physical_memory = 0;
3738 size_t os::win32::_default_stack_size = 0;
3739
3740 intx os::win32::_os_thread_limit = 0;
3741 volatile intx os::win32::_os_thread_count = 0;
3742
3743 bool os::win32::_is_nt = false;
3744 bool os::win32::_is_windows_2003 = false;
3745 bool os::win32::_is_windows_server = false;
3746
3747 // 6573254
3748 // Currently, the bug is observed across all the supported Windows releases,
3749 // including the latest one (as of this writing - Windows Server 2012 R2)
3750 bool os::win32::_has_exit_bug = true;
3751 bool os::win32::_has_performance_count = 0;
3752
3753 void os::win32::initialize_system_info() {
3754 SYSTEM_INFO si;
3755 GetSystemInfo(&si);
3756 _vm_page_size = si.dwPageSize;
3757 _vm_allocation_granularity = si.dwAllocationGranularity;
3758 _processor_type = si.dwProcessorType;
3759 _processor_level = si.wProcessorLevel;
3760 set_processor_count(si.dwNumberOfProcessors);
3761
3762 MEMORYSTATUSEX ms;
3763 ms.dwLength = sizeof(ms);
3764
3765 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3766 // dwMemoryLoad (% of memory in use)
3767 GlobalMemoryStatusEx(&ms);
3768 _physical_memory = ms.ullTotalPhys;
3769
3770 OSVERSIONINFOEX oi;
3771 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3772 GetVersionEx((OSVERSIONINFO*)&oi);
3773 switch (oi.dwPlatformId) {
3774 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3775 case VER_PLATFORM_WIN32_NT:
3776 _is_nt = true;
3777 {
3778 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3779 if (os_vers == 5002) {
3780 _is_windows_2003 = true;
3781 }
3782 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3783 oi.wProductType == VER_NT_SERVER) {
3784 _is_windows_server = true;
3785 }
3786 }
3787 break;
3788 default: fatal("Unknown platform");
3789 }
3790
3791 _default_stack_size = os::current_stack_size();
3792 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3793 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3794 "stack size not a multiple of page size");
3795
3796 initialize_performance_counter();
3797 }
3798
3799
3800 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3801 int ebuflen) {
3802 char path[MAX_PATH];
3803 DWORD size;
3804 DWORD pathLen = (DWORD)sizeof(path);
3805 HINSTANCE result = NULL;
3806
3807 // only allow library name without path component
3808 assert(strchr(name, '\\') == NULL, "path not allowed");
3809 assert(strchr(name, ':') == NULL, "path not allowed");
3810 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3811 jio_snprintf(ebuf, ebuflen,
3812 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3813 return NULL;
3814 }
3815
3816 // search system directory
3817 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3818 if (size >= pathLen) {
3819 return NULL; // truncated
3820 }
3821 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3822 return NULL; // truncated
3823 }
3824 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3825 return result;
3826 }
3827 }
3828
3829 // try Windows directory
3830 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3831 if (size >= pathLen) {
3832 return NULL; // truncated
3833 }
3834 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3835 return NULL; // truncated
3836 }
3837 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3838 return result;
3839 }
3840 }
3841
3842 jio_snprintf(ebuf, ebuflen,
3843 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3844 return NULL;
3845 }
3846
3847 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3848
3849 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3850 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3851 return TRUE;
3852 }
3853
3854 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3855 // Basic approach:
3856 // - Each exiting thread registers its intent to exit and then does so.
3857 // - A thread trying to terminate the process must wait for all
3858 // threads currently exiting to complete their exit.
3859
3860 if (os::win32::has_exit_bug()) {
3861 // The array holds handles of the threads that have started exiting by calling
3862 // _endthreadex().
3863 // Should be large enough to avoid blocking the exiting thread due to lack of
3864 // a free slot.
3865 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3866 static int handle_count = 0;
3867
3868 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3869 static CRITICAL_SECTION crit_sect;
3870 static volatile jint process_exiting = 0;
3871 int i, j;
3872 DWORD res;
3873 HANDLE hproc, hthr;
3874
3875 // The first thread that reached this point, initializes the critical section.
3876 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3877 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3878 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3879 EnterCriticalSection(&crit_sect);
3880
3881 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3882 // Remove from the array those handles of the threads that have completed exiting.
3883 for (i = 0, j = 0; i < handle_count; ++i) {
3884 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3885 if (res == WAIT_TIMEOUT) {
3886 handles[j++] = handles[i];
3887 } else {
3888 if (res == WAIT_FAILED) {
3889 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3890 GetLastError(), __FILE__, __LINE__);
3891 }
3892 // Don't keep the handle, if we failed waiting for it.
3893 CloseHandle(handles[i]);
3894 }
3895 }
3896
3897 // If there's no free slot in the array of the kept handles, we'll have to
3898 // wait until at least one thread completes exiting.
3899 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3900 // Raise the priority of the oldest exiting thread to increase its chances
3901 // to complete sooner.
3902 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3903 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3904 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3905 i = (res - WAIT_OBJECT_0);
3906 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3907 for (; i < handle_count; ++i) {
3908 handles[i] = handles[i + 1];
3909 }
3910 } else {
3911 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3912 (res == WAIT_FAILED ? "failed" : "timed out"),
3913 GetLastError(), __FILE__, __LINE__);
3914 // Don't keep handles, if we failed waiting for them.
3915 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3916 CloseHandle(handles[i]);
3917 }
3918 handle_count = 0;
3919 }
3920 }
3921
3922 // Store a duplicate of the current thread handle in the array of handles.
3923 hproc = GetCurrentProcess();
3924 hthr = GetCurrentThread();
3925 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3926 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3927 warning("DuplicateHandle failed (%u) in %s: %d\n",
3928 GetLastError(), __FILE__, __LINE__);
3929 } else {
3930 ++handle_count;
3931 }
3932
3933 // The current exiting thread has stored its handle in the array, and now
3934 // should leave the critical section before calling _endthreadex().
3935
3936 } else if (what != EPT_THREAD) {
3937 if (handle_count > 0) {
3938 // Before ending the process, make sure all the threads that had called
3939 // _endthreadex() completed.
3940
3941 // Set the priority level of the current thread to the same value as
3942 // the priority level of exiting threads.
3943 // This is to ensure it will be given a fair chance to execute if
3944 // the timeout expires.
3945 hthr = GetCurrentThread();
3946 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3947 for (i = 0; i < handle_count; ++i) {
3948 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3949 }
3950 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3951 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3952 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3953 (res == WAIT_FAILED ? "failed" : "timed out"),
3954 GetLastError(), __FILE__, __LINE__);
3955 }
3956 for (i = 0; i < handle_count; ++i) {
3957 CloseHandle(handles[i]);
3958 }
3959 handle_count = 0;
3960 }
3961
3962 OrderAccess::release_store(&process_exiting, 1);
3963 }
3964
3965 LeaveCriticalSection(&crit_sect);
3966 }
3967
3968 if (what == EPT_THREAD) {
3969 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3970 // Some other thread is about to call exit(), so we
3971 // don't let the current thread proceed to _endthreadex()
3972 SuspendThread(GetCurrentThread());
3973 // Avoid busy-wait loop, if SuspendThread() failed.
3974 Sleep(EXIT_TIMEOUT);
3975 }
3976 }
3977 }
3978
3979 // We are here if either
3980 // - there's no 'race at exit' bug on this OS release;
3981 // - initialization of the critical section failed (unlikely);
3982 // - the current thread has stored its handle and left the critical section;
3983 // - the process-exiting thread has raised the flag and left the critical section.
3984 if (what == EPT_THREAD) {
3985 _endthreadex((unsigned)exit_code);
3986 } else if (what == EPT_PROCESS) {
3987 ::exit(exit_code);
3988 } else {
3989 _exit(exit_code);
3990 }
3991
3992 // Should not reach here
3993 return exit_code;
3994 }
3995
3996 #undef EXIT_TIMEOUT
3997
3998 void os::win32::setmode_streams() {
3999 _setmode(_fileno(stdin), _O_BINARY);
4000 _setmode(_fileno(stdout), _O_BINARY);
4001 _setmode(_fileno(stderr), _O_BINARY);
4002 }
4003
4004
4005 bool os::is_debugger_attached() {
4006 return IsDebuggerPresent() ? true : false;
4007 }
4008
4009
4010 void os::wait_for_keypress_at_exit(void) {
4011 if (PauseAtExit) {
4012 fprintf(stderr, "Press any key to continue...\n");
4013 fgetc(stdin);
4014 }
4015 }
4016
4017
4018 bool os::message_box(const char* title, const char* message) {
4019 int result = MessageBox(NULL, message, title,
4020 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4021 return result == IDYES;
4022 }
4023
4024 #ifndef PRODUCT
4025 #ifndef _WIN64
4026 // Helpers to check whether NX protection is enabled
4027 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4028 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4029 pex->ExceptionRecord->NumberParameters > 0 &&
4030 pex->ExceptionRecord->ExceptionInformation[0] ==
4031 EXCEPTION_INFO_EXEC_VIOLATION) {
4032 return EXCEPTION_EXECUTE_HANDLER;
4033 }
4034 return EXCEPTION_CONTINUE_SEARCH;
4035 }
4036
4037 void nx_check_protection() {
4038 // If NX is enabled we'll get an exception calling into code on the stack
4039 char code[] = { (char)0xC3 }; // ret
4040 void *code_ptr = (void *)code;
4041 __try {
4042 __asm call code_ptr
4043 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4044 tty->print_raw_cr("NX protection detected.");
4045 }
4046 }
4047 #endif // _WIN64
4048 #endif // PRODUCT
4049
4050 // this is called _before_ the global arguments have been parsed
4051 void os::init(void) {
4052 _initial_pid = _getpid();
4053
4054 init_random(1234567);
4055
4056 win32::initialize_system_info();
4057 win32::setmode_streams();
4058 init_page_sizes((size_t) win32::vm_page_size());
4059
4060 // This may be overridden later when argument processing is done.
4061 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4062 os::win32::is_windows_2003());
4063
4064 // Initialize main_process and main_thread
4065 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4066 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4067 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4068 fatal("DuplicateHandle failed\n");
4069 }
4070 main_thread_id = (int) GetCurrentThreadId();
4071
4072 // initialize fast thread access - only used for 32-bit
4073 win32::initialize_thread_ptr_offset();
4074 }
4075
4076 // To install functions for atexit processing
4077 extern "C" {
4078 static void perfMemory_exit_helper() {
4079 perfMemory_exit();
4080 }
4081 }
4082
4083 static jint initSock();
4084
4085 // this is called _after_ the global arguments have been parsed
4086 jint os::init_2(void) {
4087 // Allocate a single page and mark it as readable for safepoint polling
4088 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4089 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4090
4091 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4092 guarantee(return_page != NULL, "Commit Failed for polling page");
4093
4094 os::set_polling_page(polling_page);
4095
4096 #ifndef PRODUCT
4097 if (Verbose && PrintMiscellaneous) {
4098 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4099 (intptr_t)polling_page);
4100 }
4101 #endif
4102
4103 if (!UseMembar) {
4104 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4105 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4106
4107 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4108 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4109
4110 os::set_memory_serialize_page(mem_serialize_page);
4111
4112 #ifndef PRODUCT
4113 if (Verbose && PrintMiscellaneous) {
4114 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4115 (intptr_t)mem_serialize_page);
4116 }
4117 #endif
4118 }
4119
4120 // Setup Windows Exceptions
4121
4122 // for debugging float code generation bugs
4123 if (ForceFloatExceptions) {
4124 #ifndef _WIN64
4125 static long fp_control_word = 0;
4126 __asm { fstcw fp_control_word }
4127 // see Intel PPro Manual, Vol. 2, p 7-16
4128 const long precision = 0x20;
4129 const long underflow = 0x10;
4130 const long overflow = 0x08;
4131 const long zero_div = 0x04;
4132 const long denorm = 0x02;
4133 const long invalid = 0x01;
4134 fp_control_word |= invalid;
4135 __asm { fldcw fp_control_word }
4136 #endif
4137 }
4138
4139 // If stack_commit_size is 0, windows will reserve the default size,
4140 // but only commit a small portion of it.
4141 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4142 size_t default_reserve_size = os::win32::default_stack_size();
4143 size_t actual_reserve_size = stack_commit_size;
4144 if (stack_commit_size < default_reserve_size) {
4145 // If stack_commit_size == 0, we want this too
4146 actual_reserve_size = default_reserve_size;
4147 }
4148
4149 // Check minimum allowable stack size for thread creation and to initialize
4150 // the java system classes, including StackOverflowError - depends on page
4151 // size. Add a page for compiler2 recursion in main thread.
4152 // Add in 2*BytesPerWord times page size to account for VM stack during
4153 // class initialization depending on 32 or 64 bit VM.
4154 size_t min_stack_allowed =
4155 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4156 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4157 if (actual_reserve_size < min_stack_allowed) {
4158 tty->print_cr("\nThe stack size specified is too small, "
4159 "Specify at least %dk",
4160 min_stack_allowed / K);
4161 return JNI_ERR;
4162 }
4163
4164 JavaThread::set_stack_size_at_create(stack_commit_size);
4165
4166 // Calculate theoretical max. size of Threads to guard gainst artifical
4167 // out-of-memory situations, where all available address-space has been
4168 // reserved by thread stacks.
4169 assert(actual_reserve_size != 0, "Must have a stack");
4170
4171 // Calculate the thread limit when we should start doing Virtual Memory
4172 // banging. Currently when the threads will have used all but 200Mb of space.
4173 //
4174 // TODO: consider performing a similar calculation for commit size instead
4175 // as reserve size, since on a 64-bit platform we'll run into that more
4176 // often than running out of virtual memory space. We can use the
4177 // lower value of the two calculations as the os_thread_limit.
4178 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4179 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4180
4181 // at exit methods are called in the reverse order of their registration.
4182 // there is no limit to the number of functions registered. atexit does
4183 // not set errno.
4184
4185 if (PerfAllowAtExitRegistration) {
4186 // only register atexit functions if PerfAllowAtExitRegistration is set.
4187 // atexit functions can be delayed until process exit time, which
4188 // can be problematic for embedded VM situations. Embedded VMs should
4189 // call DestroyJavaVM() to assure that VM resources are released.
4190
4191 // note: perfMemory_exit_helper atexit function may be removed in
4192 // the future if the appropriate cleanup code can be added to the
4193 // VM_Exit VMOperation's doit method.
4194 if (atexit(perfMemory_exit_helper) != 0) {
4195 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4196 }
4197 }
4198
4199 #ifndef _WIN64
4200 // Print something if NX is enabled (win32 on AMD64)
4201 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4202 #endif
4203
4204 // initialize thread priority policy
4205 prio_init();
4206
4207 if (UseNUMA && !ForceNUMA) {
4208 UseNUMA = false; // We don't fully support this yet
4209 }
4210
4211 if (UseNUMAInterleaving) {
4212 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4213 bool success = numa_interleaving_init();
4214 if (!success) UseNUMAInterleaving = false;
4215 }
4216
4217 if (initSock() != JNI_OK) {
4218 return JNI_ERR;
4219 }
4220
4221 return JNI_OK;
4222 }
4223
4224 // Mark the polling page as unreadable
4225 void os::make_polling_page_unreadable(void) {
4226 DWORD old_status;
4227 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4228 PAGE_NOACCESS, &old_status)) {
4229 fatal("Could not disable polling page");
4230 }
4231 }
4232
4233 // Mark the polling page as readable
4234 void os::make_polling_page_readable(void) {
4235 DWORD old_status;
4236 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4237 PAGE_READONLY, &old_status)) {
4238 fatal("Could not enable polling page");
4239 }
4240 }
4241
4242
4243 int os::stat(const char *path, struct stat *sbuf) {
4244 char pathbuf[MAX_PATH];
4245 if (strlen(path) > MAX_PATH - 1) {
4246 errno = ENAMETOOLONG;
4247 return -1;
4248 }
4249 os::native_path(strcpy(pathbuf, path));
4250 int ret = ::stat(pathbuf, sbuf);
4251 if (sbuf != NULL && UseUTCFileTimestamp) {
4252 // Fix for 6539723. st_mtime returned from stat() is dependent on
4253 // the system timezone and so can return different values for the
4254 // same file if/when daylight savings time changes. This adjustment
4255 // makes sure the same timestamp is returned regardless of the TZ.
4256 //
4257 // See:
4258 // http://msdn.microsoft.com/library/
4259 // default.asp?url=/library/en-us/sysinfo/base/
4260 // time_zone_information_str.asp
4261 // and
4262 // http://msdn.microsoft.com/library/default.asp?url=
4263 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4264 //
4265 // NOTE: there is a insidious bug here: If the timezone is changed
4266 // after the call to stat() but before 'GetTimeZoneInformation()', then
4267 // the adjustment we do here will be wrong and we'll return the wrong
4268 // value (which will likely end up creating an invalid class data
4269 // archive). Absent a better API for this, or some time zone locking
4270 // mechanism, we'll have to live with this risk.
4271 TIME_ZONE_INFORMATION tz;
4272 DWORD tzid = GetTimeZoneInformation(&tz);
4273 int daylightBias =
4274 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4275 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4276 }
4277 return ret;
4278 }
4279
4280
4281 #define FT2INT64(ft) \
4282 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4283
4284
4285 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4286 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4287 // of a thread.
4288 //
4289 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4290 // the fast estimate available on the platform.
4291
4292 // current_thread_cpu_time() is not optimized for Windows yet
4293 jlong os::current_thread_cpu_time() {
4294 // return user + sys since the cost is the same
4295 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4296 }
4297
4298 jlong os::thread_cpu_time(Thread* thread) {
4299 // consistent with what current_thread_cpu_time() returns.
4300 return os::thread_cpu_time(thread, true /* user+sys */);
4301 }
4302
4303 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4304 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4305 }
4306
4307 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4308 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4309 // If this function changes, os::is_thread_cpu_time_supported() should too
4310 if (os::win32::is_nt()) {
4311 FILETIME CreationTime;
4312 FILETIME ExitTime;
4313 FILETIME KernelTime;
4314 FILETIME UserTime;
4315
4316 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4317 &ExitTime, &KernelTime, &UserTime) == 0) {
4318 return -1;
4319 } else if (user_sys_cpu_time) {
4320 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4321 } else {
4322 return FT2INT64(UserTime) * 100;
4323 }
4324 } else {
4325 return (jlong) timeGetTime() * 1000000;
4326 }
4327 }
4328
4329 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4330 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4331 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4332 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4333 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4334 }
4335
4336 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4337 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4338 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4339 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4340 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4341 }
4342
4343 bool os::is_thread_cpu_time_supported() {
4344 // see os::thread_cpu_time
4345 if (os::win32::is_nt()) {
4346 FILETIME CreationTime;
4347 FILETIME ExitTime;
4348 FILETIME KernelTime;
4349 FILETIME UserTime;
4350
4351 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4352 &KernelTime, &UserTime) == 0) {
4353 return false;
4354 } else {
4355 return true;
4356 }
4357 } else {
4358 return false;
4359 }
4360 }
4361
4362 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4363 // It does have primitives (PDH API) to get CPU usage and run queue length.
4364 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4365 // If we wanted to implement loadavg on Windows, we have a few options:
4366 //
4367 // a) Query CPU usage and run queue length and "fake" an answer by
4368 // returning the CPU usage if it's under 100%, and the run queue
4369 // length otherwise. It turns out that querying is pretty slow
4370 // on Windows, on the order of 200 microseconds on a fast machine.
4371 // Note that on the Windows the CPU usage value is the % usage
4372 // since the last time the API was called (and the first call
4373 // returns 100%), so we'd have to deal with that as well.
4374 //
4375 // b) Sample the "fake" answer using a sampling thread and store
4376 // the answer in a global variable. The call to loadavg would
4377 // just return the value of the global, avoiding the slow query.
4378 //
4379 // c) Sample a better answer using exponential decay to smooth the
4380 // value. This is basically the algorithm used by UNIX kernels.
4381 //
4382 // Note that sampling thread starvation could affect both (b) and (c).
4383 int os::loadavg(double loadavg[], int nelem) {
4384 return -1;
4385 }
4386
4387
4388 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4389 bool os::dont_yield() {
4390 return DontYieldALot;
4391 }
4392
4393 // This method is a slightly reworked copy of JDK's sysOpen
4394 // from src/windows/hpi/src/sys_api_md.c
4395
4396 int os::open(const char *path, int oflag, int mode) {
4397 char pathbuf[MAX_PATH];
4398
4399 if (strlen(path) > MAX_PATH - 1) {
4400 errno = ENAMETOOLONG;
4401 return -1;
4402 }
4403 os::native_path(strcpy(pathbuf, path));
4404 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4405 }
4406
4407 FILE* os::open(int fd, const char* mode) {
4408 return ::_fdopen(fd, mode);
4409 }
4410
4411 // Is a (classpath) directory empty?
4412 bool os::dir_is_empty(const char* path) {
4413 WIN32_FIND_DATA fd;
4414 HANDLE f = FindFirstFile(path, &fd);
4415 if (f == INVALID_HANDLE_VALUE) {
4416 return true;
4417 }
4418 FindClose(f);
4419 return false;
4420 }
4421
4422 // create binary file, rewriting existing file if required
4423 int os::create_binary_file(const char* path, bool rewrite_existing) {
4424 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4425 if (!rewrite_existing) {
4426 oflags |= _O_EXCL;
4427 }
4428 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4429 }
4430
4431 // return current position of file pointer
4432 jlong os::current_file_offset(int fd) {
4433 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4434 }
4435
4436 // move file pointer to the specified offset
4437 jlong os::seek_to_file_offset(int fd, jlong offset) {
4438 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4439 }
4440
4441
4442 jlong os::lseek(int fd, jlong offset, int whence) {
4443 return (jlong) ::_lseeki64(fd, offset, whence);
4444 }
4445
4446 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4447 OVERLAPPED ov;
4448 DWORD nread;
4449 BOOL result;
4450
4451 ZeroMemory(&ov, sizeof(ov));
4452 ov.Offset = (DWORD)offset;
4453 ov.OffsetHigh = (DWORD)(offset >> 32);
4454
4455 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4456
4457 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4458
4459 return result ? nread : 0;
4460 }
4461
4462
4463 // This method is a slightly reworked copy of JDK's sysNativePath
4464 // from src/windows/hpi/src/path_md.c
4465
4466 // Convert a pathname to native format. On win32, this involves forcing all
4467 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4468 // sometimes rejects '/') and removing redundant separators. The input path is
4469 // assumed to have been converted into the character encoding used by the local
4470 // system. Because this might be a double-byte encoding, care is taken to
4471 // treat double-byte lead characters correctly.
4472 //
4473 // This procedure modifies the given path in place, as the result is never
4474 // longer than the original. There is no error return; this operation always
4475 // succeeds.
4476 char * os::native_path(char *path) {
4477 char *src = path, *dst = path, *end = path;
4478 char *colon = NULL; // If a drive specifier is found, this will
4479 // point to the colon following the drive letter
4480
4481 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4482 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4483 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4484
4485 // Check for leading separators
4486 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4487 while (isfilesep(*src)) {
4488 src++;
4489 }
4490
4491 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4492 // Remove leading separators if followed by drive specifier. This
4493 // hack is necessary to support file URLs containing drive
4494 // specifiers (e.g., "file://c:/path"). As a side effect,
4495 // "/c:/path" can be used as an alternative to "c:/path".
4496 *dst++ = *src++;
4497 colon = dst;
4498 *dst++ = ':';
4499 src++;
4500 } else {
4501 src = path;
4502 if (isfilesep(src[0]) && isfilesep(src[1])) {
4503 // UNC pathname: Retain first separator; leave src pointed at
4504 // second separator so that further separators will be collapsed
4505 // into the second separator. The result will be a pathname
4506 // beginning with "\\\\" followed (most likely) by a host name.
4507 src = dst = path + 1;
4508 path[0] = '\\'; // Force first separator to '\\'
4509 }
4510 }
4511
4512 end = dst;
4513
4514 // Remove redundant separators from remainder of path, forcing all
4515 // separators to be '\\' rather than '/'. Also, single byte space
4516 // characters are removed from the end of the path because those
4517 // are not legal ending characters on this operating system.
4518 //
4519 while (*src != '\0') {
4520 if (isfilesep(*src)) {
4521 *dst++ = '\\'; src++;
4522 while (isfilesep(*src)) src++;
4523 if (*src == '\0') {
4524 // Check for trailing separator
4525 end = dst;
4526 if (colon == dst - 2) break; // "z:\\"
4527 if (dst == path + 1) break; // "\\"
4528 if (dst == path + 2 && isfilesep(path[0])) {
4529 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4530 // beginning of a UNC pathname. Even though it is not, by
4531 // itself, a valid UNC pathname, we leave it as is in order
4532 // to be consistent with the path canonicalizer as well
4533 // as the win32 APIs, which treat this case as an invalid
4534 // UNC pathname rather than as an alias for the root
4535 // directory of the current drive.
4536 break;
4537 }
4538 end = --dst; // Path does not denote a root directory, so
4539 // remove trailing separator
4540 break;
4541 }
4542 end = dst;
4543 } else {
4544 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4545 *dst++ = *src++;
4546 if (*src) *dst++ = *src++;
4547 end = dst;
4548 } else { // Copy a single-byte character
4549 char c = *src++;
4550 *dst++ = c;
4551 // Space is not a legal ending character
4552 if (c != ' ') end = dst;
4553 }
4554 }
4555 }
4556
4557 *end = '\0';
4558
4559 // For "z:", add "." to work around a bug in the C runtime library
4560 if (colon == dst - 1) {
4561 path[2] = '.';
4562 path[3] = '\0';
4563 }
4564
4565 return path;
4566 }
4567
4568 // This code is a copy of JDK's sysSetLength
4569 // from src/windows/hpi/src/sys_api_md.c
4570
4571 int os::ftruncate(int fd, jlong length) {
4572 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4573 long high = (long)(length >> 32);
4574 DWORD ret;
4575
4576 if (h == (HANDLE)(-1)) {
4577 return -1;
4578 }
4579
4580 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4581 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4582 return -1;
4583 }
4584
4585 if (::SetEndOfFile(h) == FALSE) {
4586 return -1;
4587 }
4588
4589 return 0;
4590 }
4591
4592
4593 // This code is a copy of JDK's sysSync
4594 // from src/windows/hpi/src/sys_api_md.c
4595 // except for the legacy workaround for a bug in Win 98
4596
4597 int os::fsync(int fd) {
4598 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4599
4600 if ((!::FlushFileBuffers(handle)) &&
4601 (GetLastError() != ERROR_ACCESS_DENIED)) {
4602 // from winerror.h
4603 return -1;
4604 }
4605 return 0;
4606 }
4607
4608 static int nonSeekAvailable(int, long *);
4609 static int stdinAvailable(int, long *);
4610
4611 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4612 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4613
4614 // This code is a copy of JDK's sysAvailable
4615 // from src/windows/hpi/src/sys_api_md.c
4616
4617 int os::available(int fd, jlong *bytes) {
4618 jlong cur, end;
4619 struct _stati64 stbuf64;
4620
4621 if (::_fstati64(fd, &stbuf64) >= 0) {
4622 int mode = stbuf64.st_mode;
4623 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4624 int ret;
4625 long lpbytes;
4626 if (fd == 0) {
4627 ret = stdinAvailable(fd, &lpbytes);
4628 } else {
4629 ret = nonSeekAvailable(fd, &lpbytes);
4630 }
4631 (*bytes) = (jlong)(lpbytes);
4632 return ret;
4633 }
4634 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4635 return FALSE;
4636 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4637 return FALSE;
4638 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4639 return FALSE;
4640 }
4641 *bytes = end - cur;
4642 return TRUE;
4643 } else {
4644 return FALSE;
4645 }
4646 }
4647
4648 // This code is a copy of JDK's nonSeekAvailable
4649 // from src/windows/hpi/src/sys_api_md.c
4650
4651 static int nonSeekAvailable(int fd, long *pbytes) {
4652 // This is used for available on non-seekable devices
4653 // (like both named and anonymous pipes, such as pipes
4654 // connected to an exec'd process).
4655 // Standard Input is a special case.
4656 HANDLE han;
4657
4658 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4659 return FALSE;
4660 }
4661
4662 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4663 // PeekNamedPipe fails when at EOF. In that case we
4664 // simply make *pbytes = 0 which is consistent with the
4665 // behavior we get on Solaris when an fd is at EOF.
4666 // The only alternative is to raise an Exception,
4667 // which isn't really warranted.
4668 //
4669 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4670 return FALSE;
4671 }
4672 *pbytes = 0;
4673 }
4674 return TRUE;
4675 }
4676
4677 #define MAX_INPUT_EVENTS 2000
4678
4679 // This code is a copy of JDK's stdinAvailable
4680 // from src/windows/hpi/src/sys_api_md.c
4681
4682 static int stdinAvailable(int fd, long *pbytes) {
4683 HANDLE han;
4684 DWORD numEventsRead = 0; // Number of events read from buffer
4685 DWORD numEvents = 0; // Number of events in buffer
4686 DWORD i = 0; // Loop index
4687 DWORD curLength = 0; // Position marker
4688 DWORD actualLength = 0; // Number of bytes readable
4689 BOOL error = FALSE; // Error holder
4690 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4691
4692 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4693 return FALSE;
4694 }
4695
4696 // Construct an array of input records in the console buffer
4697 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4698 if (error == 0) {
4699 return nonSeekAvailable(fd, pbytes);
4700 }
4701
4702 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4703 if (numEvents > MAX_INPUT_EVENTS) {
4704 numEvents = MAX_INPUT_EVENTS;
4705 }
4706
4707 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4708 if (lpBuffer == NULL) {
4709 return FALSE;
4710 }
4711
4712 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4713 if (error == 0) {
4714 os::free(lpBuffer);
4715 return FALSE;
4716 }
4717
4718 // Examine input records for the number of bytes available
4719 for (i=0; i<numEvents; i++) {
4720 if (lpBuffer[i].EventType == KEY_EVENT) {
4721
4722 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4723 &(lpBuffer[i].Event);
4724 if (keyRecord->bKeyDown == TRUE) {
4725 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4726 curLength++;
4727 if (*keyPressed == '\r') {
4728 actualLength = curLength;
4729 }
4730 }
4731 }
4732 }
4733
4734 if (lpBuffer != NULL) {
4735 os::free(lpBuffer);
4736 }
4737
4738 *pbytes = (long) actualLength;
4739 return TRUE;
4740 }
4741
4742 // Map a block of memory.
4743 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4744 char *addr, size_t bytes, bool read_only,
4745 bool allow_exec) {
4746 HANDLE hFile;
4747 char* base;
4748
4749 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4750 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4751 if (hFile == NULL) {
4752 if (PrintMiscellaneous && Verbose) {
4753 DWORD err = GetLastError();
4754 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4755 }
4756 return NULL;
4757 }
4758
4759 if (allow_exec) {
4760 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4761 // unless it comes from a PE image (which the shared archive is not.)
4762 // Even VirtualProtect refuses to give execute access to mapped memory
4763 // that was not previously executable.
4764 //
4765 // Instead, stick the executable region in anonymous memory. Yuck.
4766 // Penalty is that ~4 pages will not be shareable - in the future
4767 // we might consider DLLizing the shared archive with a proper PE
4768 // header so that mapping executable + sharing is possible.
4769
4770 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4771 PAGE_READWRITE);
4772 if (base == NULL) {
4773 if (PrintMiscellaneous && Verbose) {
4774 DWORD err = GetLastError();
4775 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4776 }
4777 CloseHandle(hFile);
4778 return NULL;
4779 }
4780
4781 DWORD bytes_read;
4782 OVERLAPPED overlapped;
4783 overlapped.Offset = (DWORD)file_offset;
4784 overlapped.OffsetHigh = 0;
4785 overlapped.hEvent = NULL;
4786 // ReadFile guarantees that if the return value is true, the requested
4787 // number of bytes were read before returning.
4788 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4789 if (!res) {
4790 if (PrintMiscellaneous && Verbose) {
4791 DWORD err = GetLastError();
4792 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4793 }
4794 release_memory(base, bytes);
4795 CloseHandle(hFile);
4796 return NULL;
4797 }
4798 } else {
4799 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4800 NULL /* file_name */);
4801 if (hMap == NULL) {
4802 if (PrintMiscellaneous && Verbose) {
4803 DWORD err = GetLastError();
4804 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4805 }
4806 CloseHandle(hFile);
4807 return NULL;
4808 }
4809
4810 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4811 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4812 (DWORD)bytes, addr);
4813 if (base == NULL) {
4814 if (PrintMiscellaneous && Verbose) {
4815 DWORD err = GetLastError();
4816 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4817 }
4818 CloseHandle(hMap);
4819 CloseHandle(hFile);
4820 return NULL;
4821 }
4822
4823 if (CloseHandle(hMap) == 0) {
4824 if (PrintMiscellaneous && Verbose) {
4825 DWORD err = GetLastError();
4826 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4827 }
4828 CloseHandle(hFile);
4829 return base;
4830 }
4831 }
4832
4833 if (allow_exec) {
4834 DWORD old_protect;
4835 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4836 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4837
4838 if (!res) {
4839 if (PrintMiscellaneous && Verbose) {
4840 DWORD err = GetLastError();
4841 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4842 }
4843 // Don't consider this a hard error, on IA32 even if the
4844 // VirtualProtect fails, we should still be able to execute
4845 CloseHandle(hFile);
4846 return base;
4847 }
4848 }
4849
4850 if (CloseHandle(hFile) == 0) {
4851 if (PrintMiscellaneous && Verbose) {
4852 DWORD err = GetLastError();
4853 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4854 }
4855 return base;
4856 }
4857
4858 return base;
4859 }
4860
4861
4862 // Remap a block of memory.
4863 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4864 char *addr, size_t bytes, bool read_only,
4865 bool allow_exec) {
4866 // This OS does not allow existing memory maps to be remapped so we
4867 // have to unmap the memory before we remap it.
4868 if (!os::unmap_memory(addr, bytes)) {
4869 return NULL;
4870 }
4871
4872 // There is a very small theoretical window between the unmap_memory()
4873 // call above and the map_memory() call below where a thread in native
4874 // code may be able to access an address that is no longer mapped.
4875
4876 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4877 read_only, allow_exec);
4878 }
4879
4880
4881 // Unmap a block of memory.
4882 // Returns true=success, otherwise false.
4883
4884 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4885 MEMORY_BASIC_INFORMATION mem_info;
4886 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4887 if (PrintMiscellaneous && Verbose) {
4888 DWORD err = GetLastError();
4889 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4890 }
4891 return false;
4892 }
4893
4894 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4895 // Instead, executable region was allocated using VirtualAlloc(). See
4896 // pd_map_memory() above.
4897 //
4898 // The following flags should match the 'exec_access' flages used for
4899 // VirtualProtect() in pd_map_memory().
4900 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4901 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4902 return pd_release_memory(addr, bytes);
4903 }
4904
4905 BOOL result = UnmapViewOfFile(addr);
4906 if (result == 0) {
4907 if (PrintMiscellaneous && Verbose) {
4908 DWORD err = GetLastError();
4909 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4910 }
4911 return false;
4912 }
4913 return true;
4914 }
4915
4916 void os::pause() {
4917 char filename[MAX_PATH];
4918 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4919 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4920 } else {
4921 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4922 }
4923
4924 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4925 if (fd != -1) {
4926 struct stat buf;
4927 ::close(fd);
4928 while (::stat(filename, &buf) == 0) {
4929 Sleep(100);
4930 }
4931 } else {
4932 jio_fprintf(stderr,
4933 "Could not open pause file '%s', continuing immediately.\n", filename);
4934 }
4935 }
4936
4937 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4938 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4939 }
4940
4941 // See the caveats for this class in os_windows.hpp
4942 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4943 // into this method and returns false. If no OS EXCEPTION was raised, returns
4944 // true.
4945 // The callback is supposed to provide the method that should be protected.
4946 //
4947 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4948 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4949 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4950 "crash_protection already set?");
4951
4952 bool success = true;
4953 __try {
4954 WatcherThread::watcher_thread()->set_crash_protection(this);
4955 cb.call();
4956 } __except(EXCEPTION_EXECUTE_HANDLER) {
4957 // only for protection, nothing to do
4958 success = false;
4959 }
4960 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4961 return success;
4962 }
4963
4964 // An Event wraps a win32 "CreateEvent" kernel handle.
4965 //
4966 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4967 //
4968 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4969 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4970 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4971 // In addition, an unpark() operation might fetch the handle field, but the
4972 // event could recycle between the fetch and the SetEvent() operation.
4973 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4974 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4975 // on an stale but recycled handle would be harmless, but in practice this might
4976 // confuse other non-Sun code, so it's not a viable approach.
4977 //
4978 // 2: Once a win32 event handle is associated with an Event, it remains associated
4979 // with the Event. The event handle is never closed. This could be construed
4980 // as handle leakage, but only up to the maximum # of threads that have been extant
4981 // at any one time. This shouldn't be an issue, as windows platforms typically
4982 // permit a process to have hundreds of thousands of open handles.
4983 //
4984 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4985 // and release unused handles.
4986 //
4987 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4988 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4989 //
4990 // 5. Use an RCU-like mechanism (Read-Copy Update).
4991 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4992 //
4993 // We use (2).
4994 //
4995 // TODO-FIXME:
4996 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4997 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4998 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4999 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5000 // into a single win32 CreateEvent() handle.
5001 //
5002 // Assumption:
5003 // Only one parker can exist on an event, which is why we allocate
5004 // them per-thread. Multiple unparkers can coexist.
5005 //
5006 // _Event transitions in park()
5007 // -1 => -1 : illegal
5008 // 1 => 0 : pass - return immediately
5009 // 0 => -1 : block; then set _Event to 0 before returning
5010 //
5011 // _Event transitions in unpark()
5012 // 0 => 1 : just return
5013 // 1 => 1 : just return
5014 // -1 => either 0 or 1; must signal target thread
5015 // That is, we can safely transition _Event from -1 to either
5016 // 0 or 1.
5017 //
5018 // _Event serves as a restricted-range semaphore.
5019 // -1 : thread is blocked, i.e. there is a waiter
5020 // 0 : neutral: thread is running or ready,
5021 // could have been signaled after a wait started
5022 // 1 : signaled - thread is running or ready
5023 //
5024 // Another possible encoding of _Event would be with
5025 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5026 //
5027
5028 int os::PlatformEvent::park(jlong Millis) {
5029 // Transitions for _Event:
5030 // -1 => -1 : illegal
5031 // 1 => 0 : pass - return immediately
5032 // 0 => -1 : block; then set _Event to 0 before returning
5033
5034 guarantee(_ParkHandle != NULL , "Invariant");
5035 guarantee(Millis > 0 , "Invariant");
5036
5037 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5038 // the initial park() operation.
5039 // Consider: use atomic decrement instead of CAS-loop
5040
5041 int v;
5042 for (;;) {
5043 v = _Event;
5044 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5045 }
5046 guarantee((v == 0) || (v == 1), "invariant");
5047 if (v != 0) return OS_OK;
5048
5049 // Do this the hard way by blocking ...
5050 // TODO: consider a brief spin here, gated on the success of recent
5051 // spin attempts by this thread.
5052 //
5053 // We decompose long timeouts into series of shorter timed waits.
5054 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5055 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5056 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5057 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5058 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5059 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5060 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5061 // for the already waited time. This policy does not admit any new outcomes.
5062 // In the future, however, we might want to track the accumulated wait time and
5063 // adjust Millis accordingly if we encounter a spurious wakeup.
5064
5065 const int MAXTIMEOUT = 0x10000000;
5066 DWORD rv = WAIT_TIMEOUT;
5067 while (_Event < 0 && Millis > 0) {
5068 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5069 if (Millis > MAXTIMEOUT) {
5070 prd = MAXTIMEOUT;
5071 }
5072 rv = ::WaitForSingleObject(_ParkHandle, prd);
5073 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5074 if (rv == WAIT_TIMEOUT) {
5075 Millis -= prd;
5076 }
5077 }
5078 v = _Event;
5079 _Event = 0;
5080 // see comment at end of os::PlatformEvent::park() below:
5081 OrderAccess::fence();
5082 // If we encounter a nearly simultanous timeout expiry and unpark()
5083 // we return OS_OK indicating we awoke via unpark().
5084 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5085 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5086 }
5087
5088 void os::PlatformEvent::park() {
5089 // Transitions for _Event:
5090 // -1 => -1 : illegal
5091 // 1 => 0 : pass - return immediately
5092 // 0 => -1 : block; then set _Event to 0 before returning
5093
5094 guarantee(_ParkHandle != NULL, "Invariant");
5095 // Invariant: Only the thread associated with the Event/PlatformEvent
5096 // may call park().
5097 // Consider: use atomic decrement instead of CAS-loop
5098 int v;
5099 for (;;) {
5100 v = _Event;
5101 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5102 }
5103 guarantee((v == 0) || (v == 1), "invariant");
5104 if (v != 0) return;
5105
5106 // Do this the hard way by blocking ...
5107 // TODO: consider a brief spin here, gated on the success of recent
5108 // spin attempts by this thread.
5109 while (_Event < 0) {
5110 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5111 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5112 }
5113
5114 // Usually we'll find _Event == 0 at this point, but as
5115 // an optional optimization we clear it, just in case can
5116 // multiple unpark() operations drove _Event up to 1.
5117 _Event = 0;
5118 OrderAccess::fence();
5119 guarantee(_Event >= 0, "invariant");
5120 }
5121
5122 void os::PlatformEvent::unpark() {
5123 guarantee(_ParkHandle != NULL, "Invariant");
5124
5125 // Transitions for _Event:
5126 // 0 => 1 : just return
5127 // 1 => 1 : just return
5128 // -1 => either 0 or 1; must signal target thread
5129 // That is, we can safely transition _Event from -1 to either
5130 // 0 or 1.
5131 // See also: "Semaphores in Plan 9" by Mullender & Cox
5132 //
5133 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5134 // that it will take two back-to-back park() calls for the owning
5135 // thread to block. This has the benefit of forcing a spurious return
5136 // from the first park() call after an unpark() call which will help
5137 // shake out uses of park() and unpark() without condition variables.
5138
5139 if (Atomic::xchg(1, &_Event) >= 0) return;
5140
5141 ::SetEvent(_ParkHandle);
5142 }
5143
5144
5145 // JSR166
5146 // -------------------------------------------------------
5147
5148 // The Windows implementation of Park is very straightforward: Basic
5149 // operations on Win32 Events turn out to have the right semantics to
5150 // use them directly. We opportunistically resuse the event inherited
5151 // from Monitor.
5152
5153 void Parker::park(bool isAbsolute, jlong time) {
5154 guarantee(_ParkEvent != NULL, "invariant");
5155 // First, demultiplex/decode time arguments
5156 if (time < 0) { // don't wait
5157 return;
5158 } else if (time == 0 && !isAbsolute) {
5159 time = INFINITE;
5160 } else if (isAbsolute) {
5161 time -= os::javaTimeMillis(); // convert to relative time
5162 if (time <= 0) { // already elapsed
5163 return;
5164 }
5165 } else { // relative
5166 time /= 1000000; // Must coarsen from nanos to millis
5167 if (time == 0) { // Wait for the minimal time unit if zero
5168 time = 1;
5169 }
5170 }
5171
5172 JavaThread* thread = JavaThread::current();
5173
5174 // Don't wait if interrupted or already triggered
5175 if (Thread::is_interrupted(thread, false) ||
5176 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5177 ResetEvent(_ParkEvent);
5178 return;
5179 } else {
5180 ThreadBlockInVM tbivm(thread);
5181 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5182 thread->set_suspend_equivalent();
5183
5184 WaitForSingleObject(_ParkEvent, time);
5185 ResetEvent(_ParkEvent);
5186
5187 // If externally suspended while waiting, re-suspend
5188 if (thread->handle_special_suspend_equivalent_condition()) {
5189 thread->java_suspend_self();
5190 }
5191 }
5192 }
5193
5194 void Parker::unpark() {
5195 guarantee(_ParkEvent != NULL, "invariant");
5196 SetEvent(_ParkEvent);
5197 }
5198
5199 // Run the specified command in a separate process. Return its exit value,
5200 // or -1 on failure (e.g. can't create a new process).
5201 int os::fork_and_exec(char* cmd) {
5202 STARTUPINFO si;
5203 PROCESS_INFORMATION pi;
5204
5205 memset(&si, 0, sizeof(si));
5206 si.cb = sizeof(si);
5207 memset(&pi, 0, sizeof(pi));
5208 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5209 cmd, // command line
5210 NULL, // process security attribute
5211 NULL, // thread security attribute
5212 TRUE, // inherits system handles
5213 0, // no creation flags
5214 NULL, // use parent's environment block
5215 NULL, // use parent's starting directory
5216 &si, // (in) startup information
5217 &pi); // (out) process information
5218
5219 if (rslt) {
5220 // Wait until child process exits.
5221 WaitForSingleObject(pi.hProcess, INFINITE);
5222
5223 DWORD exit_code;
5224 GetExitCodeProcess(pi.hProcess, &exit_code);
5225
5226 // Close process and thread handles.
5227 CloseHandle(pi.hProcess);
5228 CloseHandle(pi.hThread);
5229
5230 return (int)exit_code;
5231 } else {
5232 return -1;
5233 }
5234 }
5235
5236 //--------------------------------------------------------------------------------------------------
5237 // Non-product code
5238
5239 static int mallocDebugIntervalCounter = 0;
5240 static int mallocDebugCounter = 0;
5241 bool os::check_heap(bool force) {
5242 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5243 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5244 // Note: HeapValidate executes two hardware breakpoints when it finds something
5245 // wrong; at these points, eax contains the address of the offending block (I think).
5246 // To get to the exlicit error message(s) below, just continue twice.
5247 //
5248 // Note: we want to check the CRT heap, which is not necessarily located in the
5249 // process default heap.
5250 HANDLE heap = (HANDLE) _get_heap_handle();
5251 if (!heap) {
5252 return true;
5253 }
5254
5255 // If we fail to lock the heap, then gflags.exe has been used
5256 // or some other special heap flag has been set that prevents
5257 // locking. We don't try to walk a heap we can't lock.
5258 if (HeapLock(heap) != 0) {
5259 PROCESS_HEAP_ENTRY phe;
5260 phe.lpData = NULL;
5261 while (HeapWalk(heap, &phe) != 0) {
5262 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5263 !HeapValidate(heap, 0, phe.lpData)) {
5264 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5265 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5266 HeapUnlock(heap);
5267 fatal("corrupted C heap");
5268 }
5269 }
5270 DWORD err = GetLastError();
5271 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5272 HeapUnlock(heap);
5273 fatal("heap walk aborted with error %d", err);
5274 }
5275 HeapUnlock(heap);
5276 }
5277 mallocDebugIntervalCounter = 0;
5278 }
5279 return true;
5280 }
5281
5282
5283 bool os::find(address addr, outputStream* st) {
5284 // Nothing yet
5285 return false;
5286 }
5287
5288 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5289 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5290
5291 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5292 JavaThread* thread = JavaThread::current();
5293 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5294 address addr = (address) exceptionRecord->ExceptionInformation[1];
5295
5296 if (os::is_memory_serialize_page(thread, addr)) {
5297 return EXCEPTION_CONTINUE_EXECUTION;
5298 }
5299 }
5300
5301 return EXCEPTION_CONTINUE_SEARCH;
5302 }
5303
5304 // We don't build a headless jre for Windows
5305 bool os::is_headless_jre() { return false; }
5306
5307 static jint initSock() {
5308 WSADATA wsadata;
5309
5310 if (!os::WinSock2Dll::WinSock2Available()) {
5311 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5312 ::GetLastError());
5313 return JNI_ERR;
5314 }
5315
5316 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5317 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5318 ::GetLastError());
5319 return JNI_ERR;
5320 }
5321 return JNI_OK;
5322 }
5323
5324 struct hostent* os::get_host_by_name(char* name) {
5325 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5326 }
5327
5328 int os::socket_close(int fd) {
5329 return ::closesocket(fd);
5330 }
5331
5332 int os::socket(int domain, int type, int protocol) {
5333 return ::socket(domain, type, protocol);
5334 }
5335
5336 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5337 return ::connect(fd, him, len);
5338 }
5339
5340 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5341 return ::recv(fd, buf, (int)nBytes, flags);
5342 }
5343
5344 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5345 return ::send(fd, buf, (int)nBytes, flags);
5346 }
5347
5348 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5349 return ::send(fd, buf, (int)nBytes, flags);
5350 }
5351
5352 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5353 #if defined(IA32)
5354 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5355 #elif defined (AMD64)
5356 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5357 #endif
5358
5359 // returns true if thread could be suspended,
5360 // false otherwise
5361 static bool do_suspend(HANDLE* h) {
5362 if (h != NULL) {
5363 if (SuspendThread(*h) != ~0) {
5364 return true;
5365 }
5366 }
5367 return false;
5368 }
5369
5370 // resume the thread
5371 // calling resume on an active thread is a no-op
5372 static void do_resume(HANDLE* h) {
5373 if (h != NULL) {
5374 ResumeThread(*h);
5375 }
5376 }
5377
5378 // retrieve a suspend/resume context capable handle
5379 // from the tid. Caller validates handle return value.
5380 void get_thread_handle_for_extended_context(HANDLE* h,
5381 OSThread::thread_id_t tid) {
5382 if (h != NULL) {
5383 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5384 }
5385 }
5386
5387 // Thread sampling implementation
5388 //
5389 void os::SuspendedThreadTask::internal_do_task() {
5390 CONTEXT ctxt;
5391 HANDLE h = NULL;
5392
5393 // get context capable handle for thread
5394 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5395
5396 // sanity
5397 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5398 return;
5399 }
5400
5401 // suspend the thread
5402 if (do_suspend(&h)) {
5403 ctxt.ContextFlags = sampling_context_flags;
5404 // get thread context
5405 GetThreadContext(h, &ctxt);
5406 SuspendedThreadTaskContext context(_thread, &ctxt);
5407 // pass context to Thread Sampling impl
5408 do_task(context);
5409 // resume thread
5410 do_resume(&h);
5411 }
5412
5413 // close handle
5414 CloseHandle(h);
5415 }
5416
5417
5418 // Kernel32 API
5419 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5420 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5421 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5422 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5423 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5424
5425 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5426 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5427 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5428 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5429 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5430
5431
5432 BOOL os::Kernel32Dll::initialized = FALSE;
5433 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5434 assert(initialized && _GetLargePageMinimum != NULL,
5435 "GetLargePageMinimumAvailable() not yet called");
5436 return _GetLargePageMinimum();
5437 }
5438
5439 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5440 if (!initialized) {
5441 initialize();
5442 }
5443 return _GetLargePageMinimum != NULL;
5444 }
5445
5446 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5447 if (!initialized) {
5448 initialize();
5449 }
5450 return _VirtualAllocExNuma != NULL;
5451 }
5452
5453 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5454 SIZE_T bytes, DWORD flags,
5455 DWORD prot, DWORD node) {
5456 assert(initialized && _VirtualAllocExNuma != NULL,
5457 "NUMACallsAvailable() not yet called");
5458
5459 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5460 }
5461
5462 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5463 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5464 "NUMACallsAvailable() not yet called");
5465
5466 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5467 }
5468
5469 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5470 PULONGLONG proc_mask) {
5471 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5472 "NUMACallsAvailable() not yet called");
5473
5474 return _GetNumaNodeProcessorMask(node, proc_mask);
5475 }
5476
5477 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5478 ULONG FrameToCapture,
5479 PVOID* BackTrace,
5480 PULONG BackTraceHash) {
5481 if (!initialized) {
5482 initialize();
5483 }
5484
5485 if (_RtlCaptureStackBackTrace != NULL) {
5486 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5487 BackTrace, BackTraceHash);
5488 } else {
5489 return 0;
5490 }
5491 }
5492
5493 void os::Kernel32Dll::initializeCommon() {
5494 if (!initialized) {
5495 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5496 assert(handle != NULL, "Just check");
5497 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5498 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5499 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5500 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5501 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5502 initialized = TRUE;
5503 }
5504 }
5505
5506 bool os::start_debugging(char *buf, int buflen) {
5507 int len = (int)strlen(buf);
5508 char *p = &buf[len];
5509
5510 jio_snprintf(p, buflen-len,
5511 "\n\n"
5512 "Do you want to debug the problem?\n\n"
5513 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5514 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5515 "Otherwise, select 'No' to abort...",
5516 os::current_process_id(), os::current_thread_id());
5517
5518 bool yes = os::message_box("Unexpected Error", buf);
5519
5520 if (yes) {
5521 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5522 // exception. If VM is running inside a debugger, the debugger will
5523 // catch the exception. Otherwise, the breakpoint exception will reach
5524 // the default windows exception handler, which can spawn a debugger and
5525 // automatically attach to the dying VM.
5526 os::breakpoint();
5527 yes = false;
5528 }
5529 return yes;
5530 }
5531
5532 #ifndef JDK6_OR_EARLIER
5533
5534 void os::Kernel32Dll::initialize() {
5535 initializeCommon();
5536 }
5537
5538
5539 // Kernel32 API
5540 inline BOOL os::Kernel32Dll::SwitchToThread() {
5541 return ::SwitchToThread();
5542 }
5543
5544 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5545 return true;
5546 }
5547
5548 // Help tools
5549 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5550 return true;
5551 }
5552
5553 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5554 DWORD th32ProcessId) {
5555 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5556 }
5557
5558 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5559 LPMODULEENTRY32 lpme) {
5560 return ::Module32First(hSnapshot, lpme);
5561 }
5562
5563 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5564 LPMODULEENTRY32 lpme) {
5565 return ::Module32Next(hSnapshot, lpme);
5566 }
5567
5568 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5569 ::GetNativeSystemInfo(lpSystemInfo);
5570 }
5571
5572 // PSAPI API
5573 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5574 HMODULE *lpModule, DWORD cb,
5575 LPDWORD lpcbNeeded) {
5576 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5577 }
5578
5579 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5580 HMODULE hModule,
5581 LPTSTR lpFilename,
5582 DWORD nSize) {
5583 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5584 }
5585
5586 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5587 HMODULE hModule,
5588 LPMODULEINFO lpmodinfo,
5589 DWORD cb) {
5590 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5591 }
5592
5593 inline BOOL os::PSApiDll::PSApiAvailable() {
5594 return true;
5595 }
5596
5597
5598 // WinSock2 API
5599 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5600 LPWSADATA lpWSAData) {
5601 return ::WSAStartup(wVersionRequested, lpWSAData);
5602 }
5603
5604 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5605 return ::gethostbyname(name);
5606 }
5607
5608 inline BOOL os::WinSock2Dll::WinSock2Available() {
5609 return true;
5610 }
5611
5612 // Advapi API
5613 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5614 BOOL DisableAllPrivileges,
5615 PTOKEN_PRIVILEGES NewState,
5616 DWORD BufferLength,
5617 PTOKEN_PRIVILEGES PreviousState,
5618 PDWORD ReturnLength) {
5619 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5620 BufferLength, PreviousState, ReturnLength);
5621 }
5622
5623 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5624 DWORD DesiredAccess,
5625 PHANDLE TokenHandle) {
5626 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5627 }
5628
5629 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5630 LPCTSTR lpName,
5631 PLUID lpLuid) {
5632 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5633 }
5634
5635 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5636 return true;
5637 }
5638
5639 void* os::get_default_process_handle() {
5640 return (void*)GetModuleHandle(NULL);
5641 }
5642
5643 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5644 // which is used to find statically linked in agents.
5645 // Additionally for windows, takes into account __stdcall names.
5646 // Parameters:
5647 // sym_name: Symbol in library we are looking for
5648 // lib_name: Name of library to look in, NULL for shared libs.
5649 // is_absolute_path == true if lib_name is absolute path to agent
5650 // such as "C:/a/b/L.dll"
5651 // == false if only the base name of the library is passed in
5652 // such as "L"
5653 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5654 bool is_absolute_path) {
5655 char *agent_entry_name;
5656 size_t len;
5657 size_t name_len;
5658 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5659 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5660 const char *start;
5661
5662 if (lib_name != NULL) {
5663 len = name_len = strlen(lib_name);
5664 if (is_absolute_path) {
5665 // Need to strip path, prefix and suffix
5666 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5667 lib_name = ++start;
5668 } else {
5669 // Need to check for drive prefix
5670 if ((start = strchr(lib_name, ':')) != NULL) {
5671 lib_name = ++start;
5672 }
5673 }
5674 if (len <= (prefix_len + suffix_len)) {
5675 return NULL;
5676 }
5677 lib_name += prefix_len;
5678 name_len = strlen(lib_name) - suffix_len;
5679 }
5680 }
5681 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5682 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5683 if (agent_entry_name == NULL) {
5684 return NULL;
5685 }
5686 if (lib_name != NULL) {
5687 const char *p = strrchr(sym_name, '@');
5688 if (p != NULL && p != sym_name) {
5689 // sym_name == _Agent_OnLoad@XX
5690 strncpy(agent_entry_name, sym_name, (p - sym_name));
5691 agent_entry_name[(p-sym_name)] = '\0';
5692 // agent_entry_name == _Agent_OnLoad
5693 strcat(agent_entry_name, "_");
5694 strncat(agent_entry_name, lib_name, name_len);
5695 strcat(agent_entry_name, p);
5696 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5697 } else {
5698 strcpy(agent_entry_name, sym_name);
5699 strcat(agent_entry_name, "_");
5700 strncat(agent_entry_name, lib_name, name_len);
5701 }
5702 } else {
5703 strcpy(agent_entry_name, sym_name);
5704 }
5705 return agent_entry_name;
5706 }
5707
5708 #else
5709 // Kernel32 API
5710 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5711 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5712 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5713 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5714 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5715
5716 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5717 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5718 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5719 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5720 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5721
5722 void os::Kernel32Dll::initialize() {
5723 if (!initialized) {
5724 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5725 assert(handle != NULL, "Just check");
5726
5727 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5728 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5729 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5730 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5731 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5732 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5733 initializeCommon(); // resolve the functions that always need resolving
5734
5735 initialized = TRUE;
5736 }
5737 }
5738
5739 BOOL os::Kernel32Dll::SwitchToThread() {
5740 assert(initialized && _SwitchToThread != NULL,
5741 "SwitchToThreadAvailable() not yet called");
5742 return _SwitchToThread();
5743 }
5744
5745
5746 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5747 if (!initialized) {
5748 initialize();
5749 }
5750 return _SwitchToThread != NULL;
5751 }
5752
5753 // Help tools
5754 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5755 if (!initialized) {
5756 initialize();
5757 }
5758 return _CreateToolhelp32Snapshot != NULL &&
5759 _Module32First != NULL &&
5760 _Module32Next != NULL;
5761 }
5762
5763 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5764 DWORD th32ProcessId) {
5765 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5766 "HelpToolsAvailable() not yet called");
5767
5768 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5769 }
5770
5771 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5772 assert(initialized && _Module32First != NULL,
5773 "HelpToolsAvailable() not yet called");
5774
5775 return _Module32First(hSnapshot, lpme);
5776 }
5777
5778 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5779 LPMODULEENTRY32 lpme) {
5780 assert(initialized && _Module32Next != NULL,
5781 "HelpToolsAvailable() not yet called");
5782
5783 return _Module32Next(hSnapshot, lpme);
5784 }
5785
5786
5787 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5788 if (!initialized) {
5789 initialize();
5790 }
5791 return _GetNativeSystemInfo != NULL;
5792 }
5793
5794 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5795 assert(initialized && _GetNativeSystemInfo != NULL,
5796 "GetNativeSystemInfoAvailable() not yet called");
5797
5798 _GetNativeSystemInfo(lpSystemInfo);
5799 }
5800
5801 // PSAPI API
5802
5803
5804 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5805 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5806 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5807
5808 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5809 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5810 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5811 BOOL os::PSApiDll::initialized = FALSE;
5812
5813 void os::PSApiDll::initialize() {
5814 if (!initialized) {
5815 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5816 if (handle != NULL) {
5817 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5818 "EnumProcessModules");
5819 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5820 "GetModuleFileNameExA");
5821 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5822 "GetModuleInformation");
5823 }
5824 initialized = TRUE;
5825 }
5826 }
5827
5828
5829
5830 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5831 DWORD cb, LPDWORD lpcbNeeded) {
5832 assert(initialized && _EnumProcessModules != NULL,
5833 "PSApiAvailable() not yet called");
5834 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5835 }
5836
5837 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5838 LPTSTR lpFilename, DWORD nSize) {
5839 assert(initialized && _GetModuleFileNameEx != NULL,
5840 "PSApiAvailable() not yet called");
5841 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5842 }
5843
5844 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5845 LPMODULEINFO lpmodinfo, DWORD cb) {
5846 assert(initialized && _GetModuleInformation != NULL,
5847 "PSApiAvailable() not yet called");
5848 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5849 }
5850
5851 BOOL os::PSApiDll::PSApiAvailable() {
5852 if (!initialized) {
5853 initialize();
5854 }
5855 return _EnumProcessModules != NULL &&
5856 _GetModuleFileNameEx != NULL &&
5857 _GetModuleInformation != NULL;
5858 }
5859
5860
5861 // WinSock2 API
5862 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5863 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5864
5865 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5866 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5867 BOOL os::WinSock2Dll::initialized = FALSE;
5868
5869 void os::WinSock2Dll::initialize() {
5870 if (!initialized) {
5871 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5872 if (handle != NULL) {
5873 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5874 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5875 }
5876 initialized = TRUE;
5877 }
5878 }
5879
5880
5881 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5882 assert(initialized && _WSAStartup != NULL,
5883 "WinSock2Available() not yet called");
5884 return _WSAStartup(wVersionRequested, lpWSAData);
5885 }
5886
5887 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5888 assert(initialized && _gethostbyname != NULL,
5889 "WinSock2Available() not yet called");
5890 return _gethostbyname(name);
5891 }
5892
5893 BOOL os::WinSock2Dll::WinSock2Available() {
5894 if (!initialized) {
5895 initialize();
5896 }
5897 return _WSAStartup != NULL &&
5898 _gethostbyname != NULL;
5899 }
5900
5901 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5902 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5903 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5904
5905 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5906 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5907 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5908 BOOL os::Advapi32Dll::initialized = FALSE;
5909
5910 void os::Advapi32Dll::initialize() {
5911 if (!initialized) {
5912 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5913 if (handle != NULL) {
5914 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5915 "AdjustTokenPrivileges");
5916 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5917 "OpenProcessToken");
5918 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5919 "LookupPrivilegeValueA");
5920 }
5921 initialized = TRUE;
5922 }
5923 }
5924
5925 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5926 BOOL DisableAllPrivileges,
5927 PTOKEN_PRIVILEGES NewState,
5928 DWORD BufferLength,
5929 PTOKEN_PRIVILEGES PreviousState,
5930 PDWORD ReturnLength) {
5931 assert(initialized && _AdjustTokenPrivileges != NULL,
5932 "AdvapiAvailable() not yet called");
5933 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5934 BufferLength, PreviousState, ReturnLength);
5935 }
5936
5937 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5938 DWORD DesiredAccess,
5939 PHANDLE TokenHandle) {
5940 assert(initialized && _OpenProcessToken != NULL,
5941 "AdvapiAvailable() not yet called");
5942 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5943 }
5944
5945 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5946 LPCTSTR lpName, PLUID lpLuid) {
5947 assert(initialized && _LookupPrivilegeValue != NULL,
5948 "AdvapiAvailable() not yet called");
5949 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5950 }
5951
5952 BOOL os::Advapi32Dll::AdvapiAvailable() {
5953 if (!initialized) {
5954 initialize();
5955 }
5956 return _AdjustTokenPrivileges != NULL &&
5957 _OpenProcessToken != NULL &&
5958 _LookupPrivilegeValue != NULL;
5959 }
5960
5961 #endif
5962
5963 #ifndef PRODUCT
5964
5965 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5966 // contiguous memory block at a particular address.
5967 // The test first tries to find a good approximate address to allocate at by using the same
5968 // method to allocate some memory at any address. The test then tries to allocate memory in
5969 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5970 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5971 // the previously allocated memory is available for allocation. The only actual failure
5972 // that is reported is when the test tries to allocate at a particular location but gets a
5973 // different valid one. A NULL return value at this point is not considered an error but may
5974 // be legitimate.
5975 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5976 void TestReserveMemorySpecial_test() {
5977 if (!UseLargePages) {
5978 if (VerboseInternalVMTests) {
5979 gclog_or_tty->print("Skipping test because large pages are disabled");
5980 }
5981 return;
5982 }
5983 // save current value of globals
5984 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5985 bool old_use_numa_interleaving = UseNUMAInterleaving;
5986
5987 // set globals to make sure we hit the correct code path
5988 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5989
5990 // do an allocation at an address selected by the OS to get a good one.
5991 const size_t large_allocation_size = os::large_page_size() * 4;
5992 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5993 if (result == NULL) {
5994 if (VerboseInternalVMTests) {
5995 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5996 large_allocation_size);
5997 }
5998 } else {
5999 os::release_memory_special(result, large_allocation_size);
6000
6001 // allocate another page within the recently allocated memory area which seems to be a good location. At least
6002 // we managed to get it once.
6003 const size_t expected_allocation_size = os::large_page_size();
6004 char* expected_location = result + os::large_page_size();
6005 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
6006 if (actual_location == NULL) {
6007 if (VerboseInternalVMTests) {
6008 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
6009 expected_location, large_allocation_size);
6010 }
6011 } else {
6012 // release memory
6013 os::release_memory_special(actual_location, expected_allocation_size);
6014 // only now check, after releasing any memory to avoid any leaks.
6015 assert(actual_location == expected_location,
6016 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
6017 expected_location, expected_allocation_size, actual_location);
6018 }
6019 }
6020
6021 // restore globals
6022 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
6023 UseNUMAInterleaving = old_use_numa_interleaving;
6024 }
6025 #endif // PRODUCT
6026
6027 /*
6028 All the defined signal names for Windows.
6029
6030 NOTE that not all of these names are accepted by FindSignal!
6031
6032 For various reasons some of these may be rejected at runtime.
6033
6034 Here are the names currently accepted by a user of sun.misc.Signal with
6035 1.4.1 (ignoring potential interaction with use of chaining, etc):
6036
6037 (LIST TBD)
6038
6039 */
6040 int os::get_signal_number(const char* name) {
6041 static const struct {
6042 char* name;
6043 int number;
6044 } siglabels [] =
6045 // derived from version 6.0 VC98/include/signal.h
6046 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
6047 "FPE", SIGFPE, // floating point exception
6048 "SEGV", SIGSEGV, // segment violation
6049 "INT", SIGINT, // interrupt
6050 "TERM", SIGTERM, // software term signal from kill
6051 "BREAK", SIGBREAK, // Ctrl-Break sequence
6052 "ILL", SIGILL}; // illegal instruction
6053 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
6054 if(!strcmp(name, siglabels[i].name))
6055 return siglabels[i].number;
6056 return -1;
6057 }
6058
6059 // Fast current thread access
6060
6061 int os::win32::_thread_ptr_offset = 0;
6062
6063 static void call_wrapper_dummy() {}
6064
6065 // We need to call the os_exception_wrapper once so that it sets
6066 // up the offset from FS of the thread pointer.
6067 void os::win32::initialize_thread_ptr_offset() {
6068 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
6069 NULL, NULL, NULL, NULL);
6070 }