1 /*
2 * Copyright (c) 1997, 2017, 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 "logging/log.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.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.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/macros.hpp"
75 #include "utilities/vmError.hpp"
76
77 #ifdef _DEBUG
78 #include <crtdbg.h>
79 #endif
80
81
82 #include <windows.h>
83 #include <sys/types.h>
84 #include <sys/stat.h>
85 #include <sys/timeb.h>
86 #include <objidl.h>
87 #include <shlobj.h>
88
89 #include <malloc.h>
90 #include <signal.h>
91 #include <direct.h>
92 #include <errno.h>
93 #include <fcntl.h>
94 #include <io.h>
95 #include <process.h> // For _beginthreadex(), _endthreadex()
96 #include <imagehlp.h> // For os::dll_address_to_function_name
97 // for enumerating dll libraries
98 #include <vdmdbg.h>
99
100 // for timer info max values which include all bits
101 #define ALL_64_BITS CONST64(-1)
102
103 // For DLL loading/load error detection
104 // Values of PE COFF
105 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
106 #define IMAGE_FILE_SIGNATURE_LENGTH 4
107
108 static HANDLE main_process;
109 static HANDLE main_thread;
110 static int main_thread_id;
111
112 static FILETIME process_creation_time;
113 static FILETIME process_exit_time;
114 static FILETIME process_user_time;
115 static FILETIME process_kernel_time;
116
117 #ifdef _M_AMD64
118 #define __CPU__ amd64
119 #else
120 #define __CPU__ i486
121 #endif
122
123 // save DLL module handle, used by GetModuleFileName
124
125 HINSTANCE vm_lib_handle;
126
127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
128 switch (reason) {
129 case DLL_PROCESS_ATTACH:
130 vm_lib_handle = hinst;
131 if (ForceTimeHighResolution) {
132 timeBeginPeriod(1L);
133 }
134 break;
135 case DLL_PROCESS_DETACH:
136 if (ForceTimeHighResolution) {
137 timeEndPeriod(1L);
138 }
139 break;
140 default:
141 break;
142 }
143 return true;
144 }
145
146 static inline double fileTimeAsDouble(FILETIME* time) {
147 const double high = (double) ((unsigned int) ~0);
148 const double split = 10000000.0;
149 double result = (time->dwLowDateTime / split) +
150 time->dwHighDateTime * (high/split);
151 return result;
152 }
153
154 // Implementation of os
155
156 bool os::unsetenv(const char* name) {
157 assert(name != NULL, "Null pointer");
158 return (SetEnvironmentVariable(name, NULL) == TRUE);
159 }
160
161 // No setuid programs under Windows.
162 bool os::have_special_privileges() {
163 return false;
164 }
165
166
167 // This method is a periodic task to check for misbehaving JNI applications
168 // under CheckJNI, we can add any periodic checks here.
169 // For Windows at the moment does nothing
170 void os::run_periodic_checks() {
171 return;
172 }
173
174 // previous UnhandledExceptionFilter, if there is one
175 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
176
177 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
178
179 void os::init_system_properties_values() {
180 // sysclasspath, java_home, dll_dir
181 {
182 char *home_path;
183 char *dll_path;
184 char *pslash;
185 char *bin = "\\bin";
186 char home_dir[MAX_PATH + 1];
187 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
188
189 if (alt_home_dir != NULL) {
190 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
191 home_dir[MAX_PATH] = '\0';
192 } else {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; // get rid of \{client|server}
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \bin
203 }
204 }
205 }
206
207 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
208 if (home_path == NULL) {
209 return;
210 }
211 strcpy(home_path, home_dir);
212 Arguments::set_java_home(home_path);
213 FREE_C_HEAP_ARRAY(char, home_path);
214
215 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
216 mtInternal);
217 if (dll_path == NULL) {
218 return;
219 }
220 strcpy(dll_path, home_dir);
221 strcat(dll_path, bin);
222 Arguments::set_dll_dir(dll_path);
223 FREE_C_HEAP_ARRAY(char, dll_path);
224
225 if (!set_boot_path('\\', ';')) {
226 return;
227 }
228 }
229
230 // library_path
231 #define EXT_DIR "\\lib\\ext"
232 #define BIN_DIR "\\bin"
233 #define PACKAGE_DIR "\\Sun\\Java"
234 {
235 // Win32 library search order (See the documentation for LoadLibrary):
236 //
237 // 1. The directory from which application is loaded.
238 // 2. The system wide Java Extensions directory (Java only)
239 // 3. System directory (GetSystemDirectory)
240 // 4. Windows directory (GetWindowsDirectory)
241 // 5. The PATH environment variable
242 // 6. The current directory
243
244 char *library_path;
245 char tmp[MAX_PATH];
246 char *path_str = ::getenv("PATH");
247
248 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
249 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
250
251 library_path[0] = '\0';
252
253 GetModuleFileName(NULL, tmp, sizeof(tmp));
254 *(strrchr(tmp, '\\')) = '\0';
255 strcat(library_path, tmp);
256
257 GetWindowsDirectory(tmp, sizeof(tmp));
258 strcat(library_path, ";");
259 strcat(library_path, tmp);
260 strcat(library_path, PACKAGE_DIR BIN_DIR);
261
262 GetSystemDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265
266 GetWindowsDirectory(tmp, sizeof(tmp));
267 strcat(library_path, ";");
268 strcat(library_path, tmp);
269
270 if (path_str) {
271 strcat(library_path, ";");
272 strcat(library_path, path_str);
273 }
274
275 strcat(library_path, ";.");
276
277 Arguments::set_library_path(library_path);
278 FREE_C_HEAP_ARRAY(char, library_path);
279 }
280
281 // Default extensions directory
282 {
283 char path[MAX_PATH];
284 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
285 GetWindowsDirectory(path, MAX_PATH);
286 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
287 path, PACKAGE_DIR, EXT_DIR);
288 Arguments::set_ext_dirs(buf);
289 }
290 #undef EXT_DIR
291 #undef BIN_DIR
292 #undef PACKAGE_DIR
293
294 #ifndef _WIN64
295 // set our UnhandledExceptionFilter and save any previous one
296 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
297 #endif
298
299 // Done
300 return;
301 }
302
303 void os::breakpoint() {
304 DebugBreak();
305 }
306
307 // Invoked from the BREAKPOINT Macro
308 extern "C" void breakpoint() {
309 os::breakpoint();
310 }
311
312 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
313 // So far, this method is only used by Native Memory Tracking, which is
314 // only supported on Windows XP or later.
315 //
316 int os::get_native_stack(address* stack, int frames, int toSkip) {
317 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
318 for (int index = captured; index < frames; index ++) {
319 stack[index] = NULL;
320 }
321 return captured;
322 }
323
324
325 // os::current_stack_base()
326 //
327 // Returns the base of the stack, which is the stack's
328 // starting address. This function must be called
329 // while running on the stack of the thread being queried.
330
331 address os::current_stack_base() {
332 MEMORY_BASIC_INFORMATION minfo;
333 address stack_bottom;
334 size_t stack_size;
335
336 VirtualQuery(&minfo, &minfo, sizeof(minfo));
337 stack_bottom = (address)minfo.AllocationBase;
338 stack_size = minfo.RegionSize;
339
340 // Add up the sizes of all the regions with the same
341 // AllocationBase.
342 while (1) {
343 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
344 if (stack_bottom == (address)minfo.AllocationBase) {
345 stack_size += minfo.RegionSize;
346 } else {
347 break;
348 }
349 }
350 return stack_bottom + stack_size;
351 }
352
353 size_t os::current_stack_size() {
354 size_t sz;
355 MEMORY_BASIC_INFORMATION minfo;
356 VirtualQuery(&minfo, &minfo, sizeof(minfo));
357 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
358 return sz;
359 }
360
361 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
362 const struct tm* time_struct_ptr = localtime(clock);
363 if (time_struct_ptr != NULL) {
364 *res = *time_struct_ptr;
365 return res;
366 }
367 return NULL;
368 }
369
370 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
371 const struct tm* time_struct_ptr = gmtime(clock);
372 if (time_struct_ptr != NULL) {
373 *res = *time_struct_ptr;
374 return res;
375 }
376 return NULL;
377 }
378
379 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
380
381 // Thread start routine for all newly created threads
382 static unsigned __stdcall thread_native_entry(Thread* thread) {
383 // Try to randomize the cache line index of hot stack frames.
384 // This helps when threads of the same stack traces evict each other's
385 // cache lines. The threads can be either from the same JVM instance, or
386 // from different JVM instances. The benefit is especially true for
387 // processors with hyperthreading technology.
388 static int counter = 0;
389 int pid = os::current_process_id();
390 _alloca(((pid ^ counter++) & 7) * 128);
391
392 thread->initialize_thread_current();
393
394 OSThread* osthr = thread->osthread();
395 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
396
397 if (UseNUMA) {
398 int lgrp_id = os::numa_get_group_id();
399 if (lgrp_id != -1) {
400 thread->set_lgrp_id(lgrp_id);
401 }
402 }
403
404 // Diagnostic code to investigate JDK-6573254
405 int res = 30115; // non-java thread
406 if (thread->is_Java_thread()) {
407 res = 20115; // java thread
408 }
409
410 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
411
412 // Install a win32 structured exception handler around every thread created
413 // by VM, so VM can generate error dump when an exception occurred in non-
414 // Java thread (e.g. VM thread).
415 __try {
416 thread->run();
417 } __except(topLevelExceptionFilter(
418 (_EXCEPTION_POINTERS*)_exception_info())) {
419 // Nothing to do.
420 }
421
422 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
423
424 // One less thread is executing
425 // When the VMThread gets here, the main thread may have already exited
426 // which frees the CodeHeap containing the Atomic::add code
427 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
428 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
429 }
430
431 // If a thread has not deleted itself ("delete this") as part of its
432 // termination sequence, we have to ensure thread-local-storage is
433 // cleared before we actually terminate. No threads should ever be
434 // deleted asynchronously with respect to their termination.
435 if (Thread::current_or_null_safe() != NULL) {
436 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
437 thread->clear_thread_current();
438 }
439
440 // Thread must not return from exit_process_or_thread(), but if it does,
441 // let it proceed to exit normally
442 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
443 }
444
445 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
446 int thread_id) {
447 // Allocate the OSThread object
448 OSThread* osthread = new OSThread(NULL, NULL);
449 if (osthread == NULL) return NULL;
450
451 // Initialize support for Java interrupts
452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
453 if (interrupt_event == NULL) {
454 delete osthread;
455 return NULL;
456 }
457 osthread->set_interrupt_event(interrupt_event);
458
459 // Store info on the Win32 thread into the OSThread
460 osthread->set_thread_handle(thread_handle);
461 osthread->set_thread_id(thread_id);
462
463 if (UseNUMA) {
464 int lgrp_id = os::numa_get_group_id();
465 if (lgrp_id != -1) {
466 thread->set_lgrp_id(lgrp_id);
467 }
468 }
469
470 // Initial thread state is INITIALIZED, not SUSPENDED
471 osthread->set_state(INITIALIZED);
472
473 return osthread;
474 }
475
476
477 bool os::create_attached_thread(JavaThread* thread) {
478 #ifdef ASSERT
479 thread->verify_not_published();
480 #endif
481 HANDLE thread_h;
482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
483 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
484 fatal("DuplicateHandle failed\n");
485 }
486 OSThread* osthread = create_os_thread(thread, thread_h,
487 (int)current_thread_id());
488 if (osthread == NULL) {
489 return false;
490 }
491
492 // Initial thread state is RUNNABLE
493 osthread->set_state(RUNNABLE);
494
495 thread->set_osthread(osthread);
496
497 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
498 os::current_thread_id());
499
500 return true;
501 }
502
503 bool os::create_main_thread(JavaThread* thread) {
504 #ifdef ASSERT
505 thread->verify_not_published();
506 #endif
507 if (_starting_thread == NULL) {
508 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
509 if (_starting_thread == NULL) {
510 return false;
511 }
512 }
513
514 // The primordial thread is runnable from the start)
515 _starting_thread->set_state(RUNNABLE);
516
517 thread->set_osthread(_starting_thread);
518 return true;
519 }
520
521 // Helper function to trace _beginthreadex attributes,
522 // similar to os::Posix::describe_pthread_attr()
523 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
524 size_t stacksize, unsigned initflag) {
525 stringStream ss(buf, buflen);
526 if (stacksize == 0) {
527 ss.print("stacksize: default, ");
528 } else {
529 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
530 }
531 ss.print("flags: ");
532 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
533 #define ALL(X) \
534 X(CREATE_SUSPENDED) \
535 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
536 ALL(PRINT_FLAG)
537 #undef ALL
538 #undef PRINT_FLAG
539 return buf;
540 }
541
542 // Allocate and initialize a new OSThread
543 bool os::create_thread(Thread* thread, ThreadType thr_type,
544 size_t stack_size) {
545 unsigned thread_id;
546
547 // Allocate the OSThread object
548 OSThread* osthread = new OSThread(NULL, NULL);
549 if (osthread == NULL) {
550 return false;
551 }
552
553 // Initialize support for Java interrupts
554 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
555 if (interrupt_event == NULL) {
556 delete osthread;
557 return NULL;
558 }
559 osthread->set_interrupt_event(interrupt_event);
560 osthread->set_interrupted(false);
561
562 thread->set_osthread(osthread);
563
564 if (stack_size == 0) {
565 switch (thr_type) {
566 case os::java_thread:
567 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
568 if (JavaThread::stack_size_at_create() > 0) {
569 stack_size = JavaThread::stack_size_at_create();
570 }
571 break;
572 case os::compiler_thread:
573 if (CompilerThreadStackSize > 0) {
574 stack_size = (size_t)(CompilerThreadStackSize * K);
575 break;
576 } // else fall through:
577 // use VMThreadStackSize if CompilerThreadStackSize is not defined
578 case os::vm_thread:
579 case os::pgc_thread:
580 case os::cgc_thread:
581 case os::watcher_thread:
582 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
583 break;
584 }
585 }
586
587 // Create the Win32 thread
588 //
589 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
590 // does not specify stack size. Instead, it specifies the size of
591 // initially committed space. The stack size is determined by
592 // PE header in the executable. If the committed "stack_size" is larger
593 // than default value in the PE header, the stack is rounded up to the
594 // nearest multiple of 1MB. For example if the launcher has default
595 // stack size of 320k, specifying any size less than 320k does not
596 // affect the actual stack size at all, it only affects the initial
597 // commitment. On the other hand, specifying 'stack_size' larger than
598 // default value may cause significant increase in memory usage, because
599 // not only the stack space will be rounded up to MB, but also the
600 // entire space is committed upfront.
601 //
602 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
603 // for CreateThread() that can treat 'stack_size' as stack size. However we
604 // are not supposed to call CreateThread() directly according to MSDN
605 // document because JVM uses C runtime library. The good news is that the
606 // flag appears to work with _beginthredex() as well.
607
608 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
609 HANDLE thread_handle =
610 (HANDLE)_beginthreadex(NULL,
611 (unsigned)stack_size,
612 (unsigned (__stdcall *)(void*)) thread_native_entry,
613 thread,
614 initflag,
615 &thread_id);
616
617 char buf[64];
618 if (thread_handle != NULL) {
619 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
620 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
621 } else {
622 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
623 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
624 }
625
626 if (thread_handle == NULL) {
627 // Need to clean up stuff we've allocated so far
628 CloseHandle(osthread->interrupt_event());
629 thread->set_osthread(NULL);
630 delete osthread;
631 return NULL;
632 }
633
634 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
635
636 // Store info on the Win32 thread into the OSThread
637 osthread->set_thread_handle(thread_handle);
638 osthread->set_thread_id(thread_id);
639
640 // Initial thread state is INITIALIZED, not SUSPENDED
641 osthread->set_state(INITIALIZED);
642
643 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
644 return true;
645 }
646
647
648 // Free Win32 resources related to the OSThread
649 void os::free_thread(OSThread* osthread) {
650 assert(osthread != NULL, "osthread not set");
651
652 // We are told to free resources of the argument thread,
653 // but we can only really operate on the current thread.
654 assert(Thread::current()->osthread() == osthread,
655 "os::free_thread but not current thread");
656
657 CloseHandle(osthread->thread_handle());
658 CloseHandle(osthread->interrupt_event());
659 delete osthread;
660 }
661
662 static jlong first_filetime;
663 static jlong initial_performance_count;
664 static jlong performance_frequency;
665
666
667 jlong as_long(LARGE_INTEGER x) {
668 jlong result = 0; // initialization to avoid warning
669 set_high(&result, x.HighPart);
670 set_low(&result, x.LowPart);
671 return result;
672 }
673
674
675 jlong os::elapsed_counter() {
676 LARGE_INTEGER count;
677 QueryPerformanceCounter(&count);
678 return as_long(count) - initial_performance_count;
679 }
680
681
682 jlong os::elapsed_frequency() {
683 return performance_frequency;
684 }
685
686
687 julong os::available_memory() {
688 return win32::available_memory();
689 }
690
691 julong os::win32::available_memory() {
692 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
693 // value if total memory is larger than 4GB
694 MEMORYSTATUSEX ms;
695 ms.dwLength = sizeof(ms);
696 GlobalMemoryStatusEx(&ms);
697
698 return (julong)ms.ullAvailPhys;
699 }
700
701 julong os::physical_memory() {
702 return win32::physical_memory();
703 }
704
705 bool os::has_allocatable_memory_limit(julong* limit) {
706 MEMORYSTATUSEX ms;
707 ms.dwLength = sizeof(ms);
708 GlobalMemoryStatusEx(&ms);
709 #ifdef _LP64
710 *limit = (julong)ms.ullAvailVirtual;
711 return true;
712 #else
713 // Limit to 1400m because of the 2gb address space wall
714 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
715 return true;
716 #endif
717 }
718
719 int os::active_processor_count() {
720 DWORD_PTR lpProcessAffinityMask = 0;
721 DWORD_PTR lpSystemAffinityMask = 0;
722 int proc_count = processor_count();
723 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
724 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
725 // Nof active processors is number of bits in process affinity mask
726 int bitcount = 0;
727 while (lpProcessAffinityMask != 0) {
728 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
729 bitcount++;
730 }
731 return bitcount;
732 } else {
733 return proc_count;
734 }
735 }
736
737 void os::set_native_thread_name(const char *name) {
738
739 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
740 //
741 // Note that unfortunately this only works if the process
742 // is already attached to a debugger; debugger must observe
743 // the exception below to show the correct name.
744
745 // If there is no debugger attached skip raising the exception
746 if (!IsDebuggerPresent()) {
747 return;
748 }
749
750 const DWORD MS_VC_EXCEPTION = 0x406D1388;
751 struct {
752 DWORD dwType; // must be 0x1000
753 LPCSTR szName; // pointer to name (in user addr space)
754 DWORD dwThreadID; // thread ID (-1=caller thread)
755 DWORD dwFlags; // reserved for future use, must be zero
756 } info;
757
758 info.dwType = 0x1000;
759 info.szName = name;
760 info.dwThreadID = -1;
761 info.dwFlags = 0;
762
763 __try {
764 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
765 } __except(EXCEPTION_EXECUTE_HANDLER) {}
766 }
767
768 bool os::distribute_processes(uint length, uint* distribution) {
769 // Not yet implemented.
770 return false;
771 }
772
773 bool os::bind_to_processor(uint processor_id) {
774 // Not yet implemented.
775 return false;
776 }
777
778 void os::win32::initialize_performance_counter() {
779 LARGE_INTEGER count;
780 QueryPerformanceFrequency(&count);
781 performance_frequency = as_long(count);
782 QueryPerformanceCounter(&count);
783 initial_performance_count = as_long(count);
784 }
785
786
787 double os::elapsedTime() {
788 return (double) elapsed_counter() / (double) elapsed_frequency();
789 }
790
791
792 // Windows format:
793 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
794 // Java format:
795 // Java standards require the number of milliseconds since 1/1/1970
796
797 // Constant offset - calculated using offset()
798 static jlong _offset = 116444736000000000;
799 // Fake time counter for reproducible results when debugging
800 static jlong fake_time = 0;
801
802 #ifdef ASSERT
803 // Just to be safe, recalculate the offset in debug mode
804 static jlong _calculated_offset = 0;
805 static int _has_calculated_offset = 0;
806
807 jlong offset() {
808 if (_has_calculated_offset) return _calculated_offset;
809 SYSTEMTIME java_origin;
810 java_origin.wYear = 1970;
811 java_origin.wMonth = 1;
812 java_origin.wDayOfWeek = 0; // ignored
813 java_origin.wDay = 1;
814 java_origin.wHour = 0;
815 java_origin.wMinute = 0;
816 java_origin.wSecond = 0;
817 java_origin.wMilliseconds = 0;
818 FILETIME jot;
819 if (!SystemTimeToFileTime(&java_origin, &jot)) {
820 fatal("Error = %d\nWindows error", GetLastError());
821 }
822 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
823 _has_calculated_offset = 1;
824 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
825 return _calculated_offset;
826 }
827 #else
828 jlong offset() {
829 return _offset;
830 }
831 #endif
832
833 jlong windows_to_java_time(FILETIME wt) {
834 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
835 return (a - offset()) / 10000;
836 }
837
838 // Returns time ticks in (10th of micro seconds)
839 jlong windows_to_time_ticks(FILETIME wt) {
840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
841 return (a - offset());
842 }
843
844 FILETIME java_to_windows_time(jlong l) {
845 jlong a = (l * 10000) + offset();
846 FILETIME result;
847 result.dwHighDateTime = high(a);
848 result.dwLowDateTime = low(a);
849 return result;
850 }
851
852 bool os::supports_vtime() { return true; }
853 bool os::enable_vtime() { return false; }
854 bool os::vtime_enabled() { return false; }
855
856 double os::elapsedVTime() {
857 FILETIME created;
858 FILETIME exited;
859 FILETIME kernel;
860 FILETIME user;
861 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
862 // the resolution of windows_to_java_time() should be sufficient (ms)
863 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
864 } else {
865 return elapsedTime();
866 }
867 }
868
869 jlong os::javaTimeMillis() {
870 if (UseFakeTimers) {
871 return fake_time++;
872 } else {
873 FILETIME wt;
874 GetSystemTimeAsFileTime(&wt);
875 return windows_to_java_time(wt);
876 }
877 }
878
879 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
880 FILETIME wt;
881 GetSystemTimeAsFileTime(&wt);
882 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
883 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
884 seconds = secs;
885 nanos = jlong(ticks - (secs*10000000)) * 100;
886 }
887
888 jlong os::javaTimeNanos() {
889 LARGE_INTEGER current_count;
890 QueryPerformanceCounter(¤t_count);
891 double current = as_long(current_count);
892 double freq = performance_frequency;
893 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
894 return time;
895 }
896
897 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
898 jlong freq = performance_frequency;
899 if (freq < NANOSECS_PER_SEC) {
900 // the performance counter is 64 bits and we will
901 // be multiplying it -- so no wrap in 64 bits
902 info_ptr->max_value = ALL_64_BITS;
903 } else if (freq > NANOSECS_PER_SEC) {
904 // use the max value the counter can reach to
905 // determine the max value which could be returned
906 julong max_counter = (julong)ALL_64_BITS;
907 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
908 } else {
909 // the performance counter is 64 bits and we will
910 // be using it directly -- so no wrap in 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912 }
913
914 // using a counter, so no skipping
915 info_ptr->may_skip_backward = false;
916 info_ptr->may_skip_forward = false;
917
918 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
919 }
920
921 char* os::local_time_string(char *buf, size_t buflen) {
922 SYSTEMTIME st;
923 GetLocalTime(&st);
924 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
925 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
926 return buf;
927 }
928
929 bool os::getTimesSecs(double* process_real_time,
930 double* process_user_time,
931 double* process_system_time) {
932 HANDLE h_process = GetCurrentProcess();
933 FILETIME create_time, exit_time, kernel_time, user_time;
934 BOOL result = GetProcessTimes(h_process,
935 &create_time,
936 &exit_time,
937 &kernel_time,
938 &user_time);
939 if (result != 0) {
940 FILETIME wt;
941 GetSystemTimeAsFileTime(&wt);
942 jlong rtc_millis = windows_to_java_time(wt);
943 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
944 *process_user_time =
945 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
946 *process_system_time =
947 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
948 return true;
949 } else {
950 return false;
951 }
952 }
953
954 void os::shutdown() {
955 // allow PerfMemory to attempt cleanup of any persistent resources
956 perfMemory_exit();
957
958 // flush buffered output, finish log files
959 ostream_abort();
960
961 // Check for abort hook
962 abort_hook_t abort_hook = Arguments::abort_hook();
963 if (abort_hook != NULL) {
964 abort_hook();
965 }
966 }
967
968
969 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
970 PMINIDUMP_EXCEPTION_INFORMATION,
971 PMINIDUMP_USER_STREAM_INFORMATION,
972 PMINIDUMP_CALLBACK_INFORMATION);
973
974 static HANDLE dumpFile = NULL;
975
976 // Check if dump file can be created.
977 void os::check_dump_limit(char* buffer, size_t buffsz) {
978 bool status = true;
979 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
980 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
981 status = false;
982 }
983
984 #ifndef ASSERT
985 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
986 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
987 status = false;
988 }
989 #endif
990
991 if (status) {
992 const char* cwd = get_current_directory(NULL, 0);
993 int pid = current_process_id();
994 if (cwd != NULL) {
995 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
996 } else {
997 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
998 }
999
1000 if (dumpFile == NULL &&
1001 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1002 == INVALID_HANDLE_VALUE) {
1003 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1004 status = false;
1005 }
1006 }
1007 VMError::record_coredump_status(buffer, status);
1008 }
1009
1010 void os::abort(bool dump_core, void* siginfo, const void* context) {
1011 HINSTANCE dbghelp;
1012 EXCEPTION_POINTERS ep;
1013 MINIDUMP_EXCEPTION_INFORMATION mei;
1014 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1015
1016 HANDLE hProcess = GetCurrentProcess();
1017 DWORD processId = GetCurrentProcessId();
1018 MINIDUMP_TYPE dumpType;
1019
1020 shutdown();
1021 if (!dump_core || dumpFile == NULL) {
1022 if (dumpFile != NULL) {
1023 CloseHandle(dumpFile);
1024 }
1025 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1026 }
1027
1028 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1029
1030 if (dbghelp == NULL) {
1031 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1032 CloseHandle(dumpFile);
1033 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1034 }
1035
1036 _MiniDumpWriteDump =
1037 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1038 PMINIDUMP_EXCEPTION_INFORMATION,
1039 PMINIDUMP_USER_STREAM_INFORMATION,
1040 PMINIDUMP_CALLBACK_INFORMATION),
1041 GetProcAddress(dbghelp,
1042 "MiniDumpWriteDump"));
1043
1044 if (_MiniDumpWriteDump == NULL) {
1045 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1046 CloseHandle(dumpFile);
1047 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1048 }
1049
1050 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1051 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1052
1053 if (siginfo != NULL && context != NULL) {
1054 ep.ContextRecord = (PCONTEXT) context;
1055 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1056
1057 mei.ThreadId = GetCurrentThreadId();
1058 mei.ExceptionPointers = &ep;
1059 pmei = &mei;
1060 } else {
1061 pmei = NULL;
1062 }
1063
1064 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1065 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1066 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1067 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1068 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1069 }
1070 CloseHandle(dumpFile);
1071 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1072 }
1073
1074 // Die immediately, no exit hook, no abort hook, no cleanup.
1075 void os::die() {
1076 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1077 }
1078
1079 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1080 // * dirent_md.c 1.15 00/02/02
1081 //
1082 // The declarations for DIR and struct dirent are in jvm_win32.h.
1083
1084 // Caller must have already run dirname through JVM_NativePath, which removes
1085 // duplicate slashes and converts all instances of '/' into '\\'.
1086
1087 DIR * os::opendir(const char *dirname) {
1088 assert(dirname != NULL, "just checking"); // hotspot change
1089 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1090 DWORD fattr; // hotspot change
1091 char alt_dirname[4] = { 0, 0, 0, 0 };
1092
1093 if (dirp == 0) {
1094 errno = ENOMEM;
1095 return 0;
1096 }
1097
1098 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1099 // as a directory in FindFirstFile(). We detect this case here and
1100 // prepend the current drive name.
1101 //
1102 if (dirname[1] == '\0' && dirname[0] == '\\') {
1103 alt_dirname[0] = _getdrive() + 'A' - 1;
1104 alt_dirname[1] = ':';
1105 alt_dirname[2] = '\\';
1106 alt_dirname[3] = '\0';
1107 dirname = alt_dirname;
1108 }
1109
1110 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1111 if (dirp->path == 0) {
1112 free(dirp);
1113 errno = ENOMEM;
1114 return 0;
1115 }
1116 strcpy(dirp->path, dirname);
1117
1118 fattr = GetFileAttributes(dirp->path);
1119 if (fattr == 0xffffffff) {
1120 free(dirp->path);
1121 free(dirp);
1122 errno = ENOENT;
1123 return 0;
1124 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1125 free(dirp->path);
1126 free(dirp);
1127 errno = ENOTDIR;
1128 return 0;
1129 }
1130
1131 // Append "*.*", or possibly "\\*.*", to path
1132 if (dirp->path[1] == ':' &&
1133 (dirp->path[2] == '\0' ||
1134 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1135 // No '\\' needed for cases like "Z:" or "Z:\"
1136 strcat(dirp->path, "*.*");
1137 } else {
1138 strcat(dirp->path, "\\*.*");
1139 }
1140
1141 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1142 if (dirp->handle == INVALID_HANDLE_VALUE) {
1143 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1144 free(dirp->path);
1145 free(dirp);
1146 errno = EACCES;
1147 return 0;
1148 }
1149 }
1150 return dirp;
1151 }
1152
1153 // parameter dbuf unused on Windows
1154 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1155 assert(dirp != NULL, "just checking"); // hotspot change
1156 if (dirp->handle == INVALID_HANDLE_VALUE) {
1157 return 0;
1158 }
1159
1160 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1161
1162 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1163 if (GetLastError() == ERROR_INVALID_HANDLE) {
1164 errno = EBADF;
1165 return 0;
1166 }
1167 FindClose(dirp->handle);
1168 dirp->handle = INVALID_HANDLE_VALUE;
1169 }
1170
1171 return &dirp->dirent;
1172 }
1173
1174 int os::closedir(DIR *dirp) {
1175 assert(dirp != NULL, "just checking"); // hotspot change
1176 if (dirp->handle != INVALID_HANDLE_VALUE) {
1177 if (!FindClose(dirp->handle)) {
1178 errno = EBADF;
1179 return -1;
1180 }
1181 dirp->handle = INVALID_HANDLE_VALUE;
1182 }
1183 free(dirp->path);
1184 free(dirp);
1185 return 0;
1186 }
1187
1188 // This must be hard coded because it's the system's temporary
1189 // directory not the java application's temp directory, ala java.io.tmpdir.
1190 const char* os::get_temp_directory() {
1191 static char path_buf[MAX_PATH];
1192 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1193 return path_buf;
1194 } else {
1195 path_buf[0] = '\0';
1196 return path_buf;
1197 }
1198 }
1199
1200 static bool file_exists(const char* filename) {
1201 if (filename == NULL || strlen(filename) == 0) {
1202 return false;
1203 }
1204 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1205 }
1206
1207 bool os::dll_build_name(char *buffer, size_t buflen,
1208 const char* pname, const char* fname) {
1209 bool retval = false;
1210 const size_t pnamelen = pname ? strlen(pname) : 0;
1211 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1212
1213 // Return error on buffer overflow.
1214 if (pnamelen + strlen(fname) + 10 > buflen) {
1215 return retval;
1216 }
1217
1218 if (pnamelen == 0) {
1219 jio_snprintf(buffer, buflen, "%s.dll", fname);
1220 retval = true;
1221 } else if (c == ':' || c == '\\') {
1222 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1223 retval = true;
1224 } else if (strchr(pname, *os::path_separator()) != NULL) {
1225 int n;
1226 char** pelements = split_path(pname, &n);
1227 if (pelements == NULL) {
1228 return false;
1229 }
1230 for (int i = 0; i < n; i++) {
1231 char* path = pelements[i];
1232 // Really shouldn't be NULL, but check can't hurt
1233 size_t plen = (path == NULL) ? 0 : strlen(path);
1234 if (plen == 0) {
1235 continue; // skip the empty path values
1236 }
1237 const char lastchar = path[plen - 1];
1238 if (lastchar == ':' || lastchar == '\\') {
1239 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1240 } else {
1241 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1242 }
1243 if (file_exists(buffer)) {
1244 retval = true;
1245 break;
1246 }
1247 }
1248 // release the storage
1249 for (int i = 0; i < n; i++) {
1250 if (pelements[i] != NULL) {
1251 FREE_C_HEAP_ARRAY(char, pelements[i]);
1252 }
1253 }
1254 if (pelements != NULL) {
1255 FREE_C_HEAP_ARRAY(char*, pelements);
1256 }
1257 } else {
1258 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1259 retval = true;
1260 }
1261 return retval;
1262 }
1263
1264 // Needs to be in os specific directory because windows requires another
1265 // header file <direct.h>
1266 const char* os::get_current_directory(char *buf, size_t buflen) {
1267 int n = static_cast<int>(buflen);
1268 if (buflen > INT_MAX) n = INT_MAX;
1269 return _getcwd(buf, n);
1270 }
1271
1272 //-----------------------------------------------------------
1273 // Helper functions for fatal error handler
1274 #ifdef _WIN64
1275 // Helper routine which returns true if address in
1276 // within the NTDLL address space.
1277 //
1278 static bool _addr_in_ntdll(address addr) {
1279 HMODULE hmod;
1280 MODULEINFO minfo;
1281
1282 hmod = GetModuleHandle("NTDLL.DLL");
1283 if (hmod == NULL) return false;
1284 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1285 &minfo, sizeof(MODULEINFO))) {
1286 return false;
1287 }
1288
1289 if ((addr >= minfo.lpBaseOfDll) &&
1290 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1291 return true;
1292 } else {
1293 return false;
1294 }
1295 }
1296 #endif
1297
1298 struct _modinfo {
1299 address addr;
1300 char* full_path; // point to a char buffer
1301 int buflen; // size of the buffer
1302 address base_addr;
1303 };
1304
1305 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1306 address top_address, void * param) {
1307 struct _modinfo *pmod = (struct _modinfo *)param;
1308 if (!pmod) return -1;
1309
1310 if (base_addr <= pmod->addr &&
1311 top_address > pmod->addr) {
1312 // if a buffer is provided, copy path name to the buffer
1313 if (pmod->full_path) {
1314 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1315 }
1316 pmod->base_addr = base_addr;
1317 return 1;
1318 }
1319 return 0;
1320 }
1321
1322 bool os::dll_address_to_library_name(address addr, char* buf,
1323 int buflen, int* offset) {
1324 // buf is not optional, but offset is optional
1325 assert(buf != NULL, "sanity check");
1326
1327 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1328 // return the full path to the DLL file, sometimes it returns path
1329 // to the corresponding PDB file (debug info); sometimes it only
1330 // returns partial path, which makes life painful.
1331
1332 struct _modinfo mi;
1333 mi.addr = addr;
1334 mi.full_path = buf;
1335 mi.buflen = buflen;
1336 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1337 // buf already contains path name
1338 if (offset) *offset = addr - mi.base_addr;
1339 return true;
1340 }
1341
1342 buf[0] = '\0';
1343 if (offset) *offset = -1;
1344 return false;
1345 }
1346
1347 bool os::dll_address_to_function_name(address addr, char *buf,
1348 int buflen, int *offset,
1349 bool demangle) {
1350 // buf is not optional, but offset is optional
1351 assert(buf != NULL, "sanity check");
1352
1353 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1354 return true;
1355 }
1356 if (offset != NULL) *offset = -1;
1357 buf[0] = '\0';
1358 return false;
1359 }
1360
1361 // save the start and end address of jvm.dll into param[0] and param[1]
1362 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1363 address top_address, void * param) {
1364 if (!param) return -1;
1365
1366 if (base_addr <= (address)_locate_jvm_dll &&
1367 top_address > (address)_locate_jvm_dll) {
1368 ((address*)param)[0] = base_addr;
1369 ((address*)param)[1] = top_address;
1370 return 1;
1371 }
1372 return 0;
1373 }
1374
1375 address vm_lib_location[2]; // start and end address of jvm.dll
1376
1377 // check if addr is inside jvm.dll
1378 bool os::address_is_in_vm(address addr) {
1379 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1380 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1381 assert(false, "Can't find jvm module.");
1382 return false;
1383 }
1384 }
1385
1386 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1387 }
1388
1389 // print module info; param is outputStream*
1390 static int _print_module(const char* fname, address base_address,
1391 address top_address, void* param) {
1392 if (!param) return -1;
1393
1394 outputStream* st = (outputStream*)param;
1395
1396 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1397 return 0;
1398 }
1399
1400 // Loads .dll/.so and
1401 // in case of error it checks if .dll/.so was built for the
1402 // same architecture as Hotspot is running on
1403 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1404 void * result = LoadLibrary(name);
1405 if (result != NULL) {
1406 return result;
1407 }
1408
1409 DWORD errcode = GetLastError();
1410 if (errcode == ERROR_MOD_NOT_FOUND) {
1411 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1412 ebuf[ebuflen - 1] = '\0';
1413 return NULL;
1414 }
1415
1416 // Parsing dll below
1417 // If we can read dll-info and find that dll was built
1418 // for an architecture other than Hotspot is running in
1419 // - then print to buffer "DLL was built for a different architecture"
1420 // else call os::lasterror to obtain system error message
1421
1422 // Read system error message into ebuf
1423 // It may or may not be overwritten below (in the for loop and just above)
1424 lasterror(ebuf, (size_t) ebuflen);
1425 ebuf[ebuflen - 1] = '\0';
1426 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1427 if (fd < 0) {
1428 return NULL;
1429 }
1430
1431 uint32_t signature_offset;
1432 uint16_t lib_arch = 0;
1433 bool failed_to_get_lib_arch =
1434 ( // Go to position 3c in the dll
1435 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1436 ||
1437 // Read location of signature
1438 (sizeof(signature_offset) !=
1439 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1440 ||
1441 // Go to COFF File Header in dll
1442 // that is located after "signature" (4 bytes long)
1443 (os::seek_to_file_offset(fd,
1444 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1445 ||
1446 // Read field that contains code of architecture
1447 // that dll was built for
1448 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1449 );
1450
1451 ::close(fd);
1452 if (failed_to_get_lib_arch) {
1453 // file i/o error - report os::lasterror(...) msg
1454 return NULL;
1455 }
1456
1457 typedef struct {
1458 uint16_t arch_code;
1459 char* arch_name;
1460 } arch_t;
1461
1462 static const arch_t arch_array[] = {
1463 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1464 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1465 };
1466 #if (defined _M_AMD64)
1467 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1468 #elif (defined _M_IX86)
1469 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1470 #else
1471 #error Method os::dll_load requires that one of following \
1472 is defined :_M_AMD64 or _M_IX86
1473 #endif
1474
1475
1476 // Obtain a string for printf operation
1477 // lib_arch_str shall contain string what platform this .dll was built for
1478 // running_arch_str shall string contain what platform Hotspot was built for
1479 char *running_arch_str = NULL, *lib_arch_str = NULL;
1480 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1481 if (lib_arch == arch_array[i].arch_code) {
1482 lib_arch_str = arch_array[i].arch_name;
1483 }
1484 if (running_arch == arch_array[i].arch_code) {
1485 running_arch_str = arch_array[i].arch_name;
1486 }
1487 }
1488
1489 assert(running_arch_str,
1490 "Didn't find running architecture code in arch_array");
1491
1492 // If the architecture is right
1493 // but some other error took place - report os::lasterror(...) msg
1494 if (lib_arch == running_arch) {
1495 return NULL;
1496 }
1497
1498 if (lib_arch_str != NULL) {
1499 ::_snprintf(ebuf, ebuflen - 1,
1500 "Can't load %s-bit .dll on a %s-bit platform",
1501 lib_arch_str, running_arch_str);
1502 } else {
1503 // don't know what architecture this dll was build for
1504 ::_snprintf(ebuf, ebuflen - 1,
1505 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1506 lib_arch, running_arch_str);
1507 }
1508
1509 return NULL;
1510 }
1511
1512 void os::print_dll_info(outputStream *st) {
1513 st->print_cr("Dynamic libraries:");
1514 get_loaded_modules_info(_print_module, (void *)st);
1515 }
1516
1517 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1518 HANDLE hProcess;
1519
1520 # define MAX_NUM_MODULES 128
1521 HMODULE modules[MAX_NUM_MODULES];
1522 static char filename[MAX_PATH];
1523 int result = 0;
1524
1525 int pid = os::current_process_id();
1526 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1527 FALSE, pid);
1528 if (hProcess == NULL) return 0;
1529
1530 DWORD size_needed;
1531 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1532 CloseHandle(hProcess);
1533 return 0;
1534 }
1535
1536 // number of modules that are currently loaded
1537 int num_modules = size_needed / sizeof(HMODULE);
1538
1539 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1540 // Get Full pathname:
1541 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1542 filename[0] = '\0';
1543 }
1544
1545 MODULEINFO modinfo;
1546 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1547 modinfo.lpBaseOfDll = NULL;
1548 modinfo.SizeOfImage = 0;
1549 }
1550
1551 // Invoke callback function
1552 result = callback(filename, (address)modinfo.lpBaseOfDll,
1553 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1554 if (result) break;
1555 }
1556
1557 CloseHandle(hProcess);
1558 return result;
1559 }
1560
1561 bool os::get_host_name(char* buf, size_t buflen) {
1562 DWORD size = (DWORD)buflen;
1563 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1564 }
1565
1566 void os::get_summary_os_info(char* buf, size_t buflen) {
1567 stringStream sst(buf, buflen);
1568 os::win32::print_windows_version(&sst);
1569 // chop off newline character
1570 char* nl = strchr(buf, '\n');
1571 if (nl != NULL) *nl = '\0';
1572 }
1573
1574 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1575 int ret = vsnprintf(buf, len, fmt, args);
1576 // Get the correct buffer size if buf is too small
1577 if (ret < 0) {
1578 return _vscprintf(fmt, args);
1579 }
1580 return ret;
1581 }
1582
1583 static inline time_t get_mtime(const char* filename) {
1584 struct stat st;
1585 int ret = os::stat(filename, &st);
1586 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1587 return st.st_mtime;
1588 }
1589
1590 int os::compare_file_modified_times(const char* file1, const char* file2) {
1591 time_t t1 = get_mtime(file1);
1592 time_t t2 = get_mtime(file2);
1593 return t1 - t2;
1594 }
1595
1596 void os::print_os_info_brief(outputStream* st) {
1597 os::print_os_info(st);
1598 }
1599
1600 void os::print_os_info(outputStream* st) {
1601 #ifdef ASSERT
1602 char buffer[1024];
1603 st->print("HostName: ");
1604 if (get_host_name(buffer, sizeof(buffer))) {
1605 st->print("%s ", buffer);
1606 } else {
1607 st->print("N/A ");
1608 }
1609 #endif
1610 st->print("OS:");
1611 os::win32::print_windows_version(st);
1612 }
1613
1614 void os::win32::print_windows_version(outputStream* st) {
1615 OSVERSIONINFOEX osvi;
1616 VS_FIXEDFILEINFO *file_info;
1617 TCHAR kernel32_path[MAX_PATH];
1618 UINT len, ret;
1619
1620 // Use the GetVersionEx information to see if we're on a server or
1621 // workstation edition of Windows. Starting with Windows 8.1 we can't
1622 // trust the OS version information returned by this API.
1623 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1624 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1625 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1626 st->print_cr("Call to GetVersionEx failed");
1627 return;
1628 }
1629 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1630
1631 // Get the full path to \Windows\System32\kernel32.dll and use that for
1632 // determining what version of Windows we're running on.
1633 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1634 ret = GetSystemDirectory(kernel32_path, len);
1635 if (ret == 0 || ret > len) {
1636 st->print_cr("Call to GetSystemDirectory failed");
1637 return;
1638 }
1639 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1640
1641 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1642 if (version_size == 0) {
1643 st->print_cr("Call to GetFileVersionInfoSize failed");
1644 return;
1645 }
1646
1647 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1648 if (version_info == NULL) {
1649 st->print_cr("Failed to allocate version_info");
1650 return;
1651 }
1652
1653 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1654 os::free(version_info);
1655 st->print_cr("Call to GetFileVersionInfo failed");
1656 return;
1657 }
1658
1659 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1660 os::free(version_info);
1661 st->print_cr("Call to VerQueryValue failed");
1662 return;
1663 }
1664
1665 int major_version = HIWORD(file_info->dwProductVersionMS);
1666 int minor_version = LOWORD(file_info->dwProductVersionMS);
1667 int build_number = HIWORD(file_info->dwProductVersionLS);
1668 int build_minor = LOWORD(file_info->dwProductVersionLS);
1669 int os_vers = major_version * 1000 + minor_version;
1670 os::free(version_info);
1671
1672 st->print(" Windows ");
1673 switch (os_vers) {
1674
1675 case 6000:
1676 if (is_workstation) {
1677 st->print("Vista");
1678 } else {
1679 st->print("Server 2008");
1680 }
1681 break;
1682
1683 case 6001:
1684 if (is_workstation) {
1685 st->print("7");
1686 } else {
1687 st->print("Server 2008 R2");
1688 }
1689 break;
1690
1691 case 6002:
1692 if (is_workstation) {
1693 st->print("8");
1694 } else {
1695 st->print("Server 2012");
1696 }
1697 break;
1698
1699 case 6003:
1700 if (is_workstation) {
1701 st->print("8.1");
1702 } else {
1703 st->print("Server 2012 R2");
1704 }
1705 break;
1706
1707 case 10000:
1708 if (is_workstation) {
1709 st->print("10");
1710 } else {
1711 st->print("Server 2016");
1712 }
1713 break;
1714
1715 default:
1716 // Unrecognized windows, print out its major and minor versions
1717 st->print("%d.%d", major_version, minor_version);
1718 break;
1719 }
1720
1721 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1722 // find out whether we are running on 64 bit processor or not
1723 SYSTEM_INFO si;
1724 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1725 GetNativeSystemInfo(&si);
1726 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1727 st->print(" , 64 bit");
1728 }
1729
1730 st->print(" Build %d", build_number);
1731 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1732 st->cr();
1733 }
1734
1735 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1736 // Nothing to do for now.
1737 }
1738
1739 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1740 HKEY key;
1741 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1742 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1743 if (status == ERROR_SUCCESS) {
1744 DWORD size = (DWORD)buflen;
1745 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1746 if (status != ERROR_SUCCESS) {
1747 strncpy(buf, "## __CPU__", buflen);
1748 }
1749 RegCloseKey(key);
1750 } else {
1751 // Put generic cpu info to return
1752 strncpy(buf, "## __CPU__", buflen);
1753 }
1754 }
1755
1756 void os::print_memory_info(outputStream* st) {
1757 st->print("Memory:");
1758 st->print(" %dk page", os::vm_page_size()>>10);
1759
1760 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1761 // value if total memory is larger than 4GB
1762 MEMORYSTATUSEX ms;
1763 ms.dwLength = sizeof(ms);
1764 GlobalMemoryStatusEx(&ms);
1765
1766 st->print(", physical %uk", os::physical_memory() >> 10);
1767 st->print("(%uk free)", os::available_memory() >> 10);
1768
1769 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1770 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1771 st->cr();
1772 }
1773
1774 void os::print_siginfo(outputStream *st, const void* siginfo) {
1775 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1776 st->print("siginfo:");
1777
1778 char tmp[64];
1779 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1780 strcpy(tmp, "EXCEPTION_??");
1781 }
1782 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1783
1784 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1785 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1786 er->NumberParameters >= 2) {
1787 switch (er->ExceptionInformation[0]) {
1788 case 0: st->print(", reading address"); break;
1789 case 1: st->print(", writing address"); break;
1790 case 8: st->print(", data execution prevention violation at address"); break;
1791 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1792 er->ExceptionInformation[0]);
1793 }
1794 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1795 } else {
1796 int num = er->NumberParameters;
1797 if (num > 0) {
1798 st->print(", ExceptionInformation=");
1799 for (int i = 0; i < num; i++) {
1800 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1801 }
1802 }
1803 }
1804 st->cr();
1805 }
1806
1807 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1808 // do nothing
1809 }
1810
1811 static char saved_jvm_path[MAX_PATH] = {0};
1812
1813 // Find the full path to the current module, jvm.dll
1814 void os::jvm_path(char *buf, jint buflen) {
1815 // Error checking.
1816 if (buflen < MAX_PATH) {
1817 assert(false, "must use a large-enough buffer");
1818 buf[0] = '\0';
1819 return;
1820 }
1821 // Lazy resolve the path to current module.
1822 if (saved_jvm_path[0] != 0) {
1823 strcpy(buf, saved_jvm_path);
1824 return;
1825 }
1826
1827 buf[0] = '\0';
1828 if (Arguments::sun_java_launcher_is_altjvm()) {
1829 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1830 // for a JAVA_HOME environment variable and fix up the path so it
1831 // looks like jvm.dll is installed there (append a fake suffix
1832 // hotspot/jvm.dll).
1833 char* java_home_var = ::getenv("JAVA_HOME");
1834 if (java_home_var != NULL && java_home_var[0] != 0 &&
1835 strlen(java_home_var) < (size_t)buflen) {
1836 strncpy(buf, java_home_var, buflen);
1837
1838 // determine if this is a legacy image or modules image
1839 // modules image doesn't have "jre" subdirectory
1840 size_t len = strlen(buf);
1841 char* jrebin_p = buf + len;
1842 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1843 if (0 != _access(buf, 0)) {
1844 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1845 }
1846 len = strlen(buf);
1847 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1848 }
1849 }
1850
1851 if (buf[0] == '\0') {
1852 GetModuleFileName(vm_lib_handle, buf, buflen);
1853 }
1854 strncpy(saved_jvm_path, buf, MAX_PATH);
1855 saved_jvm_path[MAX_PATH - 1] = '\0';
1856 }
1857
1858
1859 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1860 #ifndef _WIN64
1861 st->print("_");
1862 #endif
1863 }
1864
1865
1866 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1867 #ifndef _WIN64
1868 st->print("@%d", args_size * sizeof(int));
1869 #endif
1870 }
1871
1872 // This method is a copy of JDK's sysGetLastErrorString
1873 // from src/windows/hpi/src/system_md.c
1874
1875 size_t os::lasterror(char* buf, size_t len) {
1876 DWORD errval;
1877
1878 if ((errval = GetLastError()) != 0) {
1879 // DOS error
1880 size_t n = (size_t)FormatMessage(
1881 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1882 NULL,
1883 errval,
1884 0,
1885 buf,
1886 (DWORD)len,
1887 NULL);
1888 if (n > 3) {
1889 // Drop final '.', CR, LF
1890 if (buf[n - 1] == '\n') n--;
1891 if (buf[n - 1] == '\r') n--;
1892 if (buf[n - 1] == '.') n--;
1893 buf[n] = '\0';
1894 }
1895 return n;
1896 }
1897
1898 if (errno != 0) {
1899 // C runtime error that has no corresponding DOS error code
1900 const char* s = os::strerror(errno);
1901 size_t n = strlen(s);
1902 if (n >= len) n = len - 1;
1903 strncpy(buf, s, n);
1904 buf[n] = '\0';
1905 return n;
1906 }
1907
1908 return 0;
1909 }
1910
1911 int os::get_last_error() {
1912 DWORD error = GetLastError();
1913 if (error == 0) {
1914 error = errno;
1915 }
1916 return (int)error;
1917 }
1918
1919 WindowsSemaphore::WindowsSemaphore(uint value) {
1920 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1921
1922 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1923 }
1924
1925 WindowsSemaphore::~WindowsSemaphore() {
1926 ::CloseHandle(_semaphore);
1927 }
1928
1929 void WindowsSemaphore::signal(uint count) {
1930 if (count > 0) {
1931 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1932
1933 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1934 }
1935 }
1936
1937 void WindowsSemaphore::wait() {
1938 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1939 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1940 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1941 }
1942
1943 // sun.misc.Signal
1944 // NOTE that this is a workaround for an apparent kernel bug where if
1945 // a signal handler for SIGBREAK is installed then that signal handler
1946 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1947 // See bug 4416763.
1948 static void (*sigbreakHandler)(int) = NULL;
1949
1950 static void UserHandler(int sig, void *siginfo, void *context) {
1951 os::signal_notify(sig);
1952 // We need to reinstate the signal handler each time...
1953 os::signal(sig, (void*)UserHandler);
1954 }
1955
1956 void* os::user_handler() {
1957 return (void*) UserHandler;
1958 }
1959
1960 void* os::signal(int signal_number, void* handler) {
1961 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1962 void (*oldHandler)(int) = sigbreakHandler;
1963 sigbreakHandler = (void (*)(int)) handler;
1964 return (void*) oldHandler;
1965 } else {
1966 return (void*)::signal(signal_number, (void (*)(int))handler);
1967 }
1968 }
1969
1970 void os::signal_raise(int signal_number) {
1971 raise(signal_number);
1972 }
1973
1974 // The Win32 C runtime library maps all console control events other than ^C
1975 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1976 // logoff, and shutdown events. We therefore install our own console handler
1977 // that raises SIGTERM for the latter cases.
1978 //
1979 static BOOL WINAPI consoleHandler(DWORD event) {
1980 switch (event) {
1981 case CTRL_C_EVENT:
1982 if (is_error_reported()) {
1983 // Ctrl-C is pressed during error reporting, likely because the error
1984 // handler fails to abort. Let VM die immediately.
1985 os::die();
1986 }
1987
1988 os::signal_raise(SIGINT);
1989 return TRUE;
1990 break;
1991 case CTRL_BREAK_EVENT:
1992 if (sigbreakHandler != NULL) {
1993 (*sigbreakHandler)(SIGBREAK);
1994 }
1995 return TRUE;
1996 break;
1997 case CTRL_LOGOFF_EVENT: {
1998 // Don't terminate JVM if it is running in a non-interactive session,
1999 // such as a service process.
2000 USEROBJECTFLAGS flags;
2001 HANDLE handle = GetProcessWindowStation();
2002 if (handle != NULL &&
2003 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2004 sizeof(USEROBJECTFLAGS), NULL)) {
2005 // If it is a non-interactive session, let next handler to deal
2006 // with it.
2007 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2008 return FALSE;
2009 }
2010 }
2011 }
2012 case CTRL_CLOSE_EVENT:
2013 case CTRL_SHUTDOWN_EVENT:
2014 os::signal_raise(SIGTERM);
2015 return TRUE;
2016 break;
2017 default:
2018 break;
2019 }
2020 return FALSE;
2021 }
2022
2023 // The following code is moved from os.cpp for making this
2024 // code platform specific, which it is by its very nature.
2025
2026 // Return maximum OS signal used + 1 for internal use only
2027 // Used as exit signal for signal_thread
2028 int os::sigexitnum_pd() {
2029 return NSIG;
2030 }
2031
2032 // a counter for each possible signal value, including signal_thread exit signal
2033 static volatile jint pending_signals[NSIG+1] = { 0 };
2034 static HANDLE sig_sem = NULL;
2035
2036 void os::signal_init_pd() {
2037 // Initialize signal structures
2038 memset((void*)pending_signals, 0, sizeof(pending_signals));
2039
2040 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2041
2042 // Programs embedding the VM do not want it to attempt to receive
2043 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2044 // shutdown hooks mechanism introduced in 1.3. For example, when
2045 // the VM is run as part of a Windows NT service (i.e., a servlet
2046 // engine in a web server), the correct behavior is for any console
2047 // control handler to return FALSE, not TRUE, because the OS's
2048 // "final" handler for such events allows the process to continue if
2049 // it is a service (while terminating it if it is not a service).
2050 // To make this behavior uniform and the mechanism simpler, we
2051 // completely disable the VM's usage of these console events if -Xrs
2052 // (=ReduceSignalUsage) is specified. This means, for example, that
2053 // the CTRL-BREAK thread dump mechanism is also disabled in this
2054 // case. See bugs 4323062, 4345157, and related bugs.
2055
2056 if (!ReduceSignalUsage) {
2057 // Add a CTRL-C handler
2058 SetConsoleCtrlHandler(consoleHandler, TRUE);
2059 }
2060 }
2061
2062 void os::signal_notify(int signal_number) {
2063 BOOL ret;
2064 if (sig_sem != NULL) {
2065 Atomic::inc(&pending_signals[signal_number]);
2066 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2067 assert(ret != 0, "ReleaseSemaphore() failed");
2068 }
2069 }
2070
2071 static int check_pending_signals(bool wait_for_signal) {
2072 DWORD ret;
2073 while (true) {
2074 for (int i = 0; i < NSIG + 1; i++) {
2075 jint n = pending_signals[i];
2076 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2077 return i;
2078 }
2079 }
2080 if (!wait_for_signal) {
2081 return -1;
2082 }
2083
2084 JavaThread *thread = JavaThread::current();
2085
2086 ThreadBlockInVM tbivm(thread);
2087
2088 bool threadIsSuspended;
2089 do {
2090 thread->set_suspend_equivalent();
2091 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2092 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2093 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2094
2095 // were we externally suspended while we were waiting?
2096 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2097 if (threadIsSuspended) {
2098 // The semaphore has been incremented, but while we were waiting
2099 // another thread suspended us. We don't want to continue running
2100 // while suspended because that would surprise the thread that
2101 // suspended us.
2102 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2103 assert(ret != 0, "ReleaseSemaphore() failed");
2104
2105 thread->java_suspend_self();
2106 }
2107 } while (threadIsSuspended);
2108 }
2109 }
2110
2111 int os::signal_lookup() {
2112 return check_pending_signals(false);
2113 }
2114
2115 int os::signal_wait() {
2116 return check_pending_signals(true);
2117 }
2118
2119 // Implicit OS exception handling
2120
2121 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2122 address handler) {
2123 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2124 // Save pc in thread
2125 #ifdef _M_AMD64
2126 // Do not blow up if no thread info available.
2127 if (thread) {
2128 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2129 }
2130 // Set pc to handler
2131 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2132 #else
2133 // Do not blow up if no thread info available.
2134 if (thread) {
2135 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2136 }
2137 // Set pc to handler
2138 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2139 #endif
2140
2141 // Continue the execution
2142 return EXCEPTION_CONTINUE_EXECUTION;
2143 }
2144
2145
2146 // Used for PostMortemDump
2147 extern "C" void safepoints();
2148 extern "C" void find(int x);
2149 extern "C" void events();
2150
2151 // According to Windows API documentation, an illegal instruction sequence should generate
2152 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2153 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2154 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2155
2156 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2157
2158 // From "Execution Protection in the Windows Operating System" draft 0.35
2159 // Once a system header becomes available, the "real" define should be
2160 // included or copied here.
2161 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2162
2163 // Windows Vista/2008 heap corruption check
2164 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2165
2166 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2167 // C++ compiler contain this error code. Because this is a compiler-generated
2168 // error, the code is not listed in the Win32 API header files.
2169 // The code is actually a cryptic mnemonic device, with the initial "E"
2170 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2171 // ASCII values of "msc".
2172
2173 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2174
2175 #define def_excpt(val) { #val, (val) }
2176
2177 static const struct { char* name; uint number; } exceptlabels[] = {
2178 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2179 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2180 def_excpt(EXCEPTION_BREAKPOINT),
2181 def_excpt(EXCEPTION_SINGLE_STEP),
2182 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2183 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2184 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2185 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2186 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2187 def_excpt(EXCEPTION_FLT_OVERFLOW),
2188 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2189 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2190 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2191 def_excpt(EXCEPTION_INT_OVERFLOW),
2192 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2193 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2194 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2195 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2196 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2197 def_excpt(EXCEPTION_STACK_OVERFLOW),
2198 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2199 def_excpt(EXCEPTION_GUARD_PAGE),
2200 def_excpt(EXCEPTION_INVALID_HANDLE),
2201 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2202 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2203 };
2204
2205 #undef def_excpt
2206
2207 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2208 uint code = static_cast<uint>(exception_code);
2209 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2210 if (exceptlabels[i].number == code) {
2211 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2212 return buf;
2213 }
2214 }
2215
2216 return NULL;
2217 }
2218
2219 //-----------------------------------------------------------------------------
2220 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2221 // handle exception caused by idiv; should only happen for -MinInt/-1
2222 // (division by zero is handled explicitly)
2223 #ifdef _M_AMD64
2224 PCONTEXT ctx = exceptionInfo->ContextRecord;
2225 address pc = (address)ctx->Rip;
2226 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2227 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2228 if (pc[0] == 0xF7) {
2229 // set correct result values and continue after idiv instruction
2230 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2231 } else {
2232 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2233 }
2234 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2235 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2236 // idiv opcode (0xF7).
2237 ctx->Rdx = (DWORD)0; // remainder
2238 // Continue the execution
2239 #else
2240 PCONTEXT ctx = exceptionInfo->ContextRecord;
2241 address pc = (address)ctx->Eip;
2242 assert(pc[0] == 0xF7, "not an idiv opcode");
2243 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2244 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2245 // set correct result values and continue after idiv instruction
2246 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2247 ctx->Eax = (DWORD)min_jint; // result
2248 ctx->Edx = (DWORD)0; // remainder
2249 // Continue the execution
2250 #endif
2251 return EXCEPTION_CONTINUE_EXECUTION;
2252 }
2253
2254 //-----------------------------------------------------------------------------
2255 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2256 PCONTEXT ctx = exceptionInfo->ContextRecord;
2257 #ifndef _WIN64
2258 // handle exception caused by native method modifying control word
2259 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2260
2261 switch (exception_code) {
2262 case EXCEPTION_FLT_DENORMAL_OPERAND:
2263 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2264 case EXCEPTION_FLT_INEXACT_RESULT:
2265 case EXCEPTION_FLT_INVALID_OPERATION:
2266 case EXCEPTION_FLT_OVERFLOW:
2267 case EXCEPTION_FLT_STACK_CHECK:
2268 case EXCEPTION_FLT_UNDERFLOW:
2269 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2270 if (fp_control_word != ctx->FloatSave.ControlWord) {
2271 // Restore FPCW and mask out FLT exceptions
2272 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2273 // Mask out pending FLT exceptions
2274 ctx->FloatSave.StatusWord &= 0xffffff00;
2275 return EXCEPTION_CONTINUE_EXECUTION;
2276 }
2277 }
2278
2279 if (prev_uef_handler != NULL) {
2280 // We didn't handle this exception so pass it to the previous
2281 // UnhandledExceptionFilter.
2282 return (prev_uef_handler)(exceptionInfo);
2283 }
2284 #else // !_WIN64
2285 // On Windows, the mxcsr control bits are non-volatile across calls
2286 // See also CR 6192333
2287 //
2288 jint MxCsr = INITIAL_MXCSR;
2289 // we can't use StubRoutines::addr_mxcsr_std()
2290 // because in Win64 mxcsr is not saved there
2291 if (MxCsr != ctx->MxCsr) {
2292 ctx->MxCsr = MxCsr;
2293 return EXCEPTION_CONTINUE_EXECUTION;
2294 }
2295 #endif // !_WIN64
2296
2297 return EXCEPTION_CONTINUE_SEARCH;
2298 }
2299
2300 static inline void report_error(Thread* t, DWORD exception_code,
2301 address addr, void* siginfo, void* context) {
2302 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2303
2304 // If UseOsErrorReporting, this will return here and save the error file
2305 // somewhere where we can find it in the minidump.
2306 }
2307
2308 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2309 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2310 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2311 address addr = (address) exceptionRecord->ExceptionInformation[1];
2312 if (Interpreter::contains(pc)) {
2313 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2314 if (!fr->is_first_java_frame()) {
2315 // get_frame_at_stack_banging_point() is only called when we
2316 // have well defined stacks so java_sender() calls do not need
2317 // to assert safe_for_sender() first.
2318 *fr = fr->java_sender();
2319 }
2320 } else {
2321 // more complex code with compiled code
2322 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2323 CodeBlob* cb = CodeCache::find_blob(pc);
2324 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2325 // Not sure where the pc points to, fallback to default
2326 // stack overflow handling
2327 return false;
2328 } else {
2329 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2330 // in compiled code, the stack banging is performed just after the return pc
2331 // has been pushed on the stack
2332 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2333 if (!fr->is_java_frame()) {
2334 // See java_sender() comment above.
2335 *fr = fr->java_sender();
2336 }
2337 }
2338 }
2339 assert(fr->is_java_frame(), "Safety check");
2340 return true;
2341 }
2342
2343 //-----------------------------------------------------------------------------
2344 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2345 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2346 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2347 #ifdef _M_AMD64
2348 address pc = (address) exceptionInfo->ContextRecord->Rip;
2349 #else
2350 address pc = (address) exceptionInfo->ContextRecord->Eip;
2351 #endif
2352 Thread* t = Thread::current_or_null_safe();
2353
2354 // Handle SafeFetch32 and SafeFetchN exceptions.
2355 if (StubRoutines::is_safefetch_fault(pc)) {
2356 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2357 }
2358
2359 #ifndef _WIN64
2360 // Execution protection violation - win32 running on AMD64 only
2361 // Handled first to avoid misdiagnosis as a "normal" access violation;
2362 // This is safe to do because we have a new/unique ExceptionInformation
2363 // code for this condition.
2364 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2365 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2366 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2367 address addr = (address) exceptionRecord->ExceptionInformation[1];
2368
2369 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2370 int page_size = os::vm_page_size();
2371
2372 // Make sure the pc and the faulting address are sane.
2373 //
2374 // If an instruction spans a page boundary, and the page containing
2375 // the beginning of the instruction is executable but the following
2376 // page is not, the pc and the faulting address might be slightly
2377 // different - we still want to unguard the 2nd page in this case.
2378 //
2379 // 15 bytes seems to be a (very) safe value for max instruction size.
2380 bool pc_is_near_addr =
2381 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2382 bool instr_spans_page_boundary =
2383 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2384 (intptr_t) page_size) > 0);
2385
2386 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2387 static volatile address last_addr =
2388 (address) os::non_memory_address_word();
2389
2390 // In conservative mode, don't unguard unless the address is in the VM
2391 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2392 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2393
2394 // Set memory to RWX and retry
2395 address page_start = align_ptr_down(addr, page_size);
2396 bool res = os::protect_memory((char*) page_start, page_size,
2397 os::MEM_PROT_RWX);
2398
2399 log_debug(os)("Execution protection violation "
2400 "at " INTPTR_FORMAT
2401 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2402 p2i(page_start), (res ? "success" : os::strerror(errno)));
2403
2404 // Set last_addr so if we fault again at the same address, we don't
2405 // end up in an endless loop.
2406 //
2407 // There are two potential complications here. Two threads trapping
2408 // at the same address at the same time could cause one of the
2409 // threads to think it already unguarded, and abort the VM. Likely
2410 // very rare.
2411 //
2412 // The other race involves two threads alternately trapping at
2413 // different addresses and failing to unguard the page, resulting in
2414 // an endless loop. This condition is probably even more unlikely
2415 // than the first.
2416 //
2417 // Although both cases could be avoided by using locks or thread
2418 // local last_addr, these solutions are unnecessary complication:
2419 // this handler is a best-effort safety net, not a complete solution.
2420 // It is disabled by default and should only be used as a workaround
2421 // in case we missed any no-execute-unsafe VM code.
2422
2423 last_addr = addr;
2424
2425 return EXCEPTION_CONTINUE_EXECUTION;
2426 }
2427 }
2428
2429 // Last unguard failed or not unguarding
2430 tty->print_raw_cr("Execution protection violation");
2431 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2432 exceptionInfo->ContextRecord);
2433 return EXCEPTION_CONTINUE_SEARCH;
2434 }
2435 }
2436 #endif // _WIN64
2437
2438 // Check to see if we caught the safepoint code in the
2439 // process of write protecting the memory serialization page.
2440 // It write enables the page immediately after protecting it
2441 // so just return.
2442 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2443 if (t != NULL && t->is_Java_thread()) {
2444 JavaThread* thread = (JavaThread*) t;
2445 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2446 address addr = (address) exceptionRecord->ExceptionInformation[1];
2447 if (os::is_memory_serialize_page(thread, addr)) {
2448 // Block current thread until the memory serialize page permission restored.
2449 os::block_on_serialize_page_trap();
2450 return EXCEPTION_CONTINUE_EXECUTION;
2451 }
2452 }
2453 }
2454
2455 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2456 VM_Version::is_cpuinfo_segv_addr(pc)) {
2457 // Verify that OS save/restore AVX registers.
2458 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2459 }
2460
2461 if (t != NULL && t->is_Java_thread()) {
2462 JavaThread* thread = (JavaThread*) t;
2463 bool in_java = thread->thread_state() == _thread_in_Java;
2464
2465 // Handle potential stack overflows up front.
2466 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2467 if (thread->stack_guards_enabled()) {
2468 if (in_java) {
2469 frame fr;
2470 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2471 address addr = (address) exceptionRecord->ExceptionInformation[1];
2472 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2473 assert(fr.is_java_frame(), "Must be a Java frame");
2474 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2475 }
2476 }
2477 // Yellow zone violation. The o/s has unprotected the first yellow
2478 // zone page for us. Note: must call disable_stack_yellow_zone to
2479 // update the enabled status, even if the zone contains only one page.
2480 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2481 thread->disable_stack_yellow_reserved_zone();
2482 // If not in java code, return and hope for the best.
2483 return in_java
2484 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2485 : EXCEPTION_CONTINUE_EXECUTION;
2486 } else {
2487 // Fatal red zone violation.
2488 thread->disable_stack_red_zone();
2489 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2490 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2491 exceptionInfo->ContextRecord);
2492 return EXCEPTION_CONTINUE_SEARCH;
2493 }
2494 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2495 // Either stack overflow or null pointer exception.
2496 if (in_java) {
2497 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2498 address addr = (address) exceptionRecord->ExceptionInformation[1];
2499 address stack_end = thread->stack_end();
2500 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2501 // Stack overflow.
2502 assert(!os::uses_stack_guard_pages(),
2503 "should be caught by red zone code above.");
2504 return Handle_Exception(exceptionInfo,
2505 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2506 }
2507 // Check for safepoint polling and implicit null
2508 // We only expect null pointers in the stubs (vtable)
2509 // the rest are checked explicitly now.
2510 CodeBlob* cb = CodeCache::find_blob(pc);
2511 if (cb != NULL) {
2512 if (os::is_poll_address(addr)) {
2513 address stub = SharedRuntime::get_poll_stub(pc);
2514 return Handle_Exception(exceptionInfo, stub);
2515 }
2516 }
2517 {
2518 #ifdef _WIN64
2519 // If it's a legal stack address map the entire region in
2520 //
2521 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2522 address addr = (address) exceptionRecord->ExceptionInformation[1];
2523 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2524 addr = (address)((uintptr_t)addr &
2525 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2526 os::commit_memory((char *)addr, thread->stack_base() - addr,
2527 !ExecMem);
2528 return EXCEPTION_CONTINUE_EXECUTION;
2529 } else
2530 #endif
2531 {
2532 // Null pointer exception.
2533 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2534 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2535 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2536 }
2537 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2538 exceptionInfo->ContextRecord);
2539 return EXCEPTION_CONTINUE_SEARCH;
2540 }
2541 }
2542 }
2543
2544 #ifdef _WIN64
2545 // Special care for fast JNI field accessors.
2546 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2547 // in and the heap gets shrunk before the field access.
2548 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2549 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2550 if (addr != (address)-1) {
2551 return Handle_Exception(exceptionInfo, addr);
2552 }
2553 }
2554 #endif
2555
2556 // Stack overflow or null pointer exception in native code.
2557 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2558 exceptionInfo->ContextRecord);
2559 return EXCEPTION_CONTINUE_SEARCH;
2560 } // /EXCEPTION_ACCESS_VIOLATION
2561 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2562
2563 if (in_java) {
2564 switch (exception_code) {
2565 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2566 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2567
2568 case EXCEPTION_INT_OVERFLOW:
2569 return Handle_IDiv_Exception(exceptionInfo);
2570
2571 } // switch
2572 }
2573 if (((thread->thread_state() == _thread_in_Java) ||
2574 (thread->thread_state() == _thread_in_native)) &&
2575 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2576 LONG result=Handle_FLT_Exception(exceptionInfo);
2577 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2578 }
2579 }
2580
2581 if (exception_code != EXCEPTION_BREAKPOINT) {
2582 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2583 exceptionInfo->ContextRecord);
2584 }
2585 return EXCEPTION_CONTINUE_SEARCH;
2586 }
2587
2588 #ifndef _WIN64
2589 // Special care for fast JNI accessors.
2590 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2591 // the heap gets shrunk before the field access.
2592 // Need to install our own structured exception handler since native code may
2593 // install its own.
2594 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2595 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2596 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2597 address pc = (address) exceptionInfo->ContextRecord->Eip;
2598 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2599 if (addr != (address)-1) {
2600 return Handle_Exception(exceptionInfo, addr);
2601 }
2602 }
2603 return EXCEPTION_CONTINUE_SEARCH;
2604 }
2605
2606 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2607 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2608 jobject obj, \
2609 jfieldID fieldID) { \
2610 __try { \
2611 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2612 obj, \
2613 fieldID); \
2614 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2615 _exception_info())) { \
2616 } \
2617 return 0; \
2618 }
2619
2620 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2621 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2622 DEFINE_FAST_GETFIELD(jchar, char, Char)
2623 DEFINE_FAST_GETFIELD(jshort, short, Short)
2624 DEFINE_FAST_GETFIELD(jint, int, Int)
2625 DEFINE_FAST_GETFIELD(jlong, long, Long)
2626 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2627 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2628
2629 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2630 switch (type) {
2631 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2632 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2633 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2634 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2635 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2636 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2637 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2638 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2639 default: ShouldNotReachHere();
2640 }
2641 return (address)-1;
2642 }
2643 #endif
2644
2645 // Virtual Memory
2646
2647 int os::vm_page_size() { return os::win32::vm_page_size(); }
2648 int os::vm_allocation_granularity() {
2649 return os::win32::vm_allocation_granularity();
2650 }
2651
2652 // Windows large page support is available on Windows 2003. In order to use
2653 // large page memory, the administrator must first assign additional privilege
2654 // to the user:
2655 // + select Control Panel -> Administrative Tools -> Local Security Policy
2656 // + select Local Policies -> User Rights Assignment
2657 // + double click "Lock pages in memory", add users and/or groups
2658 // + reboot
2659 // Note the above steps are needed for administrator as well, as administrators
2660 // by default do not have the privilege to lock pages in memory.
2661 //
2662 // Note about Windows 2003: although the API supports committing large page
2663 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2664 // scenario, I found through experiment it only uses large page if the entire
2665 // memory region is reserved and committed in a single VirtualAlloc() call.
2666 // This makes Windows large page support more or less like Solaris ISM, in
2667 // that the entire heap must be committed upfront. This probably will change
2668 // in the future, if so the code below needs to be revisited.
2669
2670 #ifndef MEM_LARGE_PAGES
2671 #define MEM_LARGE_PAGES 0x20000000
2672 #endif
2673
2674 static HANDLE _hProcess;
2675 static HANDLE _hToken;
2676
2677 // Container for NUMA node list info
2678 class NUMANodeListHolder {
2679 private:
2680 int *_numa_used_node_list; // allocated below
2681 int _numa_used_node_count;
2682
2683 void free_node_list() {
2684 if (_numa_used_node_list != NULL) {
2685 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2686 }
2687 }
2688
2689 public:
2690 NUMANodeListHolder() {
2691 _numa_used_node_count = 0;
2692 _numa_used_node_list = NULL;
2693 // do rest of initialization in build routine (after function pointers are set up)
2694 }
2695
2696 ~NUMANodeListHolder() {
2697 free_node_list();
2698 }
2699
2700 bool build() {
2701 DWORD_PTR proc_aff_mask;
2702 DWORD_PTR sys_aff_mask;
2703 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2704 ULONG highest_node_number;
2705 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2706 free_node_list();
2707 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2708 for (unsigned int i = 0; i <= highest_node_number; i++) {
2709 ULONGLONG proc_mask_numa_node;
2710 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2711 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2712 _numa_used_node_list[_numa_used_node_count++] = i;
2713 }
2714 }
2715 return (_numa_used_node_count > 1);
2716 }
2717
2718 int get_count() { return _numa_used_node_count; }
2719 int get_node_list_entry(int n) {
2720 // for indexes out of range, returns -1
2721 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2722 }
2723
2724 } numa_node_list_holder;
2725
2726
2727
2728 static size_t _large_page_size = 0;
2729
2730 static bool request_lock_memory_privilege() {
2731 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2732 os::current_process_id());
2733
2734 LUID luid;
2735 if (_hProcess != NULL &&
2736 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2737 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2738
2739 TOKEN_PRIVILEGES tp;
2740 tp.PrivilegeCount = 1;
2741 tp.Privileges[0].Luid = luid;
2742 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2743
2744 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2745 // privilege. Check GetLastError() too. See MSDN document.
2746 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2747 (GetLastError() == ERROR_SUCCESS)) {
2748 return true;
2749 }
2750 }
2751
2752 return false;
2753 }
2754
2755 static void cleanup_after_large_page_init() {
2756 if (_hProcess) CloseHandle(_hProcess);
2757 _hProcess = NULL;
2758 if (_hToken) CloseHandle(_hToken);
2759 _hToken = NULL;
2760 }
2761
2762 static bool numa_interleaving_init() {
2763 bool success = false;
2764 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2765
2766 // print a warning if UseNUMAInterleaving flag is specified on command line
2767 bool warn_on_failure = use_numa_interleaving_specified;
2768 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2769
2770 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2771 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2772 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2773
2774 if (numa_node_list_holder.build()) {
2775 if (log_is_enabled(Debug, os, cpu)) {
2776 Log(os, cpu) log;
2777 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2778 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2779 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2780 }
2781 }
2782 success = true;
2783 } else {
2784 WARN("Process does not cover multiple NUMA nodes.");
2785 }
2786 if (!success) {
2787 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2788 }
2789 return success;
2790 #undef WARN
2791 }
2792
2793 // this routine is used whenever we need to reserve a contiguous VA range
2794 // but we need to make separate VirtualAlloc calls for each piece of the range
2795 // Reasons for doing this:
2796 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2797 // * UseNUMAInterleaving requires a separate node for each piece
2798 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2799 DWORD prot,
2800 bool should_inject_error = false) {
2801 char * p_buf;
2802 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2803 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2804 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2805
2806 // first reserve enough address space in advance since we want to be
2807 // able to break a single contiguous virtual address range into multiple
2808 // large page commits but WS2003 does not allow reserving large page space
2809 // so we just use 4K pages for reserve, this gives us a legal contiguous
2810 // address space. then we will deallocate that reservation, and re alloc
2811 // using large pages
2812 const size_t size_of_reserve = bytes + chunk_size;
2813 if (bytes > size_of_reserve) {
2814 // Overflowed.
2815 return NULL;
2816 }
2817 p_buf = (char *) VirtualAlloc(addr,
2818 size_of_reserve, // size of Reserve
2819 MEM_RESERVE,
2820 PAGE_READWRITE);
2821 // If reservation failed, return NULL
2822 if (p_buf == NULL) return NULL;
2823 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2824 os::release_memory(p_buf, bytes + chunk_size);
2825
2826 // we still need to round up to a page boundary (in case we are using large pages)
2827 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2828 // instead we handle this in the bytes_to_rq computation below
2829 p_buf = align_ptr_up(p_buf, page_size);
2830
2831 // now go through and allocate one chunk at a time until all bytes are
2832 // allocated
2833 size_t bytes_remaining = bytes;
2834 // An overflow of align_size_up() would have been caught above
2835 // in the calculation of size_of_reserve.
2836 char * next_alloc_addr = p_buf;
2837 HANDLE hProc = GetCurrentProcess();
2838
2839 #ifdef ASSERT
2840 // Variable for the failure injection
2841 long ran_num = os::random();
2842 size_t fail_after = ran_num % bytes;
2843 #endif
2844
2845 int count=0;
2846 while (bytes_remaining) {
2847 // select bytes_to_rq to get to the next chunk_size boundary
2848
2849 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2850 // Note allocate and commit
2851 char * p_new;
2852
2853 #ifdef ASSERT
2854 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2855 #else
2856 const bool inject_error_now = false;
2857 #endif
2858
2859 if (inject_error_now) {
2860 p_new = NULL;
2861 } else {
2862 if (!UseNUMAInterleaving) {
2863 p_new = (char *) VirtualAlloc(next_alloc_addr,
2864 bytes_to_rq,
2865 flags,
2866 prot);
2867 } else {
2868 // get the next node to use from the used_node_list
2869 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2870 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2871 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2872 }
2873 }
2874
2875 if (p_new == NULL) {
2876 // Free any allocated pages
2877 if (next_alloc_addr > p_buf) {
2878 // Some memory was committed so release it.
2879 size_t bytes_to_release = bytes - bytes_remaining;
2880 // NMT has yet to record any individual blocks, so it
2881 // need to create a dummy 'reserve' record to match
2882 // the release.
2883 MemTracker::record_virtual_memory_reserve((address)p_buf,
2884 bytes_to_release, CALLER_PC);
2885 os::release_memory(p_buf, bytes_to_release);
2886 }
2887 #ifdef ASSERT
2888 if (should_inject_error) {
2889 log_develop_debug(pagesize)("Reserving pages individually failed.");
2890 }
2891 #endif
2892 return NULL;
2893 }
2894
2895 bytes_remaining -= bytes_to_rq;
2896 next_alloc_addr += bytes_to_rq;
2897 count++;
2898 }
2899 // Although the memory is allocated individually, it is returned as one.
2900 // NMT records it as one block.
2901 if ((flags & MEM_COMMIT) != 0) {
2902 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2903 } else {
2904 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2905 }
2906
2907 // made it this far, success
2908 return p_buf;
2909 }
2910
2911
2912
2913 void os::large_page_init() {
2914 if (!UseLargePages) return;
2915
2916 // print a warning if any large page related flag is specified on command line
2917 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2918 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2919 bool success = false;
2920
2921 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2922 if (request_lock_memory_privilege()) {
2923 size_t s = GetLargePageMinimum();
2924 if (s) {
2925 #if defined(IA32) || defined(AMD64)
2926 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2927 WARN("JVM cannot use large pages bigger than 4mb.");
2928 } else {
2929 #endif
2930 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2931 _large_page_size = LargePageSizeInBytes;
2932 } else {
2933 _large_page_size = s;
2934 }
2935 success = true;
2936 #if defined(IA32) || defined(AMD64)
2937 }
2938 #endif
2939 } else {
2940 WARN("Large page is not supported by the processor.");
2941 }
2942 } else {
2943 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2944 }
2945 #undef WARN
2946
2947 const size_t default_page_size = (size_t) vm_page_size();
2948 if (success && _large_page_size > default_page_size) {
2949 _page_sizes[0] = _large_page_size;
2950 _page_sizes[1] = default_page_size;
2951 _page_sizes[2] = 0;
2952 }
2953
2954 cleanup_after_large_page_init();
2955 UseLargePages = success;
2956 }
2957
2958 // On win32, one cannot release just a part of reserved memory, it's an
2959 // all or nothing deal. When we split a reservation, we must break the
2960 // reservation into two reservations.
2961 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2962 bool realloc) {
2963 if (size > 0) {
2964 release_memory(base, size);
2965 if (realloc) {
2966 reserve_memory(split, base);
2967 }
2968 if (size != split) {
2969 reserve_memory(size - split, base + split);
2970 }
2971 }
2972 }
2973
2974 // Multiple threads can race in this code but it's not possible to unmap small sections of
2975 // virtual space to get requested alignment, like posix-like os's.
2976 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
2977 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
2978 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
2979 "Alignment must be a multiple of allocation granularity (page size)");
2980 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
2981
2982 size_t extra_size = size + alignment;
2983 assert(extra_size >= size, "overflow, size is too large to allow alignment");
2984
2985 char* aligned_base = NULL;
2986
2987 do {
2988 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
2989 if (extra_base == NULL) {
2990 return NULL;
2991 }
2992 // Do manual alignment
2993 aligned_base = align_ptr_up(extra_base, alignment);
2994
2995 os::release_memory(extra_base, extra_size);
2996
2997 aligned_base = os::reserve_memory(size, aligned_base);
2998
2999 } while (aligned_base == NULL);
3000
3001 return aligned_base;
3002 }
3003
3004 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3005 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3006 "reserve alignment");
3007 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3008 char* res;
3009 // note that if UseLargePages is on, all the areas that require interleaving
3010 // will go thru reserve_memory_special rather than thru here.
3011 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3012 if (!use_individual) {
3013 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3014 } else {
3015 elapsedTimer reserveTimer;
3016 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3017 // in numa interleaving, we have to allocate pages individually
3018 // (well really chunks of NUMAInterleaveGranularity size)
3019 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3020 if (res == NULL) {
3021 warning("NUMA page allocation failed");
3022 }
3023 if (Verbose && PrintMiscellaneous) {
3024 reserveTimer.stop();
3025 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3026 reserveTimer.milliseconds(), reserveTimer.ticks());
3027 }
3028 }
3029 assert(res == NULL || addr == NULL || addr == res,
3030 "Unexpected address from reserve.");
3031
3032 return res;
3033 }
3034
3035 // Reserve memory at an arbitrary address, only if that area is
3036 // available (and not reserved for something else).
3037 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3038 // Windows os::reserve_memory() fails of the requested address range is
3039 // not avilable.
3040 return reserve_memory(bytes, requested_addr);
3041 }
3042
3043 size_t os::large_page_size() {
3044 return _large_page_size;
3045 }
3046
3047 bool os::can_commit_large_page_memory() {
3048 // Windows only uses large page memory when the entire region is reserved
3049 // and committed in a single VirtualAlloc() call. This may change in the
3050 // future, but with Windows 2003 it's not possible to commit on demand.
3051 return false;
3052 }
3053
3054 bool os::can_execute_large_page_memory() {
3055 return true;
3056 }
3057
3058 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3059 bool exec) {
3060 assert(UseLargePages, "only for large pages");
3061
3062 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3063 return NULL; // Fallback to small pages.
3064 }
3065
3066 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3067 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3068
3069 // with large pages, there are two cases where we need to use Individual Allocation
3070 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3071 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3072 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3073 log_debug(pagesize)("Reserving large pages individually.");
3074
3075 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3076 if (p_buf == NULL) {
3077 // give an appropriate warning message
3078 if (UseNUMAInterleaving) {
3079 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3080 }
3081 if (UseLargePagesIndividualAllocation) {
3082 warning("Individually allocated large pages failed, "
3083 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3084 }
3085 return NULL;
3086 }
3087
3088 return p_buf;
3089
3090 } else {
3091 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3092
3093 // normal policy just allocate it all at once
3094 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3095 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3096 if (res != NULL) {
3097 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3098 }
3099
3100 return res;
3101 }
3102 }
3103
3104 bool os::release_memory_special(char* base, size_t bytes) {
3105 assert(base != NULL, "Sanity check");
3106 return release_memory(base, bytes);
3107 }
3108
3109 void os::print_statistics() {
3110 }
3111
3112 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3113 int err = os::get_last_error();
3114 char buf[256];
3115 size_t buf_len = os::lasterror(buf, sizeof(buf));
3116 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3117 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3118 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3119 }
3120
3121 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3122 if (bytes == 0) {
3123 // Don't bother the OS with noops.
3124 return true;
3125 }
3126 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3127 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3128 // Don't attempt to print anything if the OS call fails. We're
3129 // probably low on resources, so the print itself may cause crashes.
3130
3131 // unless we have NUMAInterleaving enabled, the range of a commit
3132 // is always within a reserve covered by a single VirtualAlloc
3133 // in that case we can just do a single commit for the requested size
3134 if (!UseNUMAInterleaving) {
3135 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3136 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3137 return false;
3138 }
3139 if (exec) {
3140 DWORD oldprot;
3141 // Windows doc says to use VirtualProtect to get execute permissions
3142 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3143 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3144 return false;
3145 }
3146 }
3147 return true;
3148 } else {
3149
3150 // when NUMAInterleaving is enabled, the commit might cover a range that
3151 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3152 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3153 // returns represents the number of bytes that can be committed in one step.
3154 size_t bytes_remaining = bytes;
3155 char * next_alloc_addr = addr;
3156 while (bytes_remaining > 0) {
3157 MEMORY_BASIC_INFORMATION alloc_info;
3158 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3159 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3160 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3161 PAGE_READWRITE) == NULL) {
3162 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3163 exec);)
3164 return false;
3165 }
3166 if (exec) {
3167 DWORD oldprot;
3168 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3169 PAGE_EXECUTE_READWRITE, &oldprot)) {
3170 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3171 exec);)
3172 return false;
3173 }
3174 }
3175 bytes_remaining -= bytes_to_rq;
3176 next_alloc_addr += bytes_to_rq;
3177 }
3178 }
3179 // if we made it this far, return true
3180 return true;
3181 }
3182
3183 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3184 bool exec) {
3185 // alignment_hint is ignored on this OS
3186 return pd_commit_memory(addr, size, exec);
3187 }
3188
3189 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3190 const char* mesg) {
3191 assert(mesg != NULL, "mesg must be specified");
3192 if (!pd_commit_memory(addr, size, exec)) {
3193 warn_fail_commit_memory(addr, size, exec);
3194 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3195 }
3196 }
3197
3198 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3199 size_t alignment_hint, bool exec,
3200 const char* mesg) {
3201 // alignment_hint is ignored on this OS
3202 pd_commit_memory_or_exit(addr, size, exec, mesg);
3203 }
3204
3205 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3206 if (bytes == 0) {
3207 // Don't bother the OS with noops.
3208 return true;
3209 }
3210 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3211 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3212 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3213 }
3214
3215 bool os::pd_release_memory(char* addr, size_t bytes) {
3216 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3217 }
3218
3219 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3220 return os::commit_memory(addr, size, !ExecMem);
3221 }
3222
3223 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3224 return os::uncommit_memory(addr, size);
3225 }
3226
3227 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3228 uint count = 0;
3229 bool ret = false;
3230 size_t bytes_remaining = bytes;
3231 char * next_protect_addr = addr;
3232
3233 // Use VirtualQuery() to get the chunk size.
3234 while (bytes_remaining) {
3235 MEMORY_BASIC_INFORMATION alloc_info;
3236 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3237 return false;
3238 }
3239
3240 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3241 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3242 // but we don't distinguish here as both cases are protected by same API.
3243 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3244 warning("Failed protecting pages individually for chunk #%u", count);
3245 if (!ret) {
3246 return false;
3247 }
3248
3249 bytes_remaining -= bytes_to_protect;
3250 next_protect_addr += bytes_to_protect;
3251 count++;
3252 }
3253 return ret;
3254 }
3255
3256 // Set protections specified
3257 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3258 bool is_committed) {
3259 unsigned int p = 0;
3260 switch (prot) {
3261 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3262 case MEM_PROT_READ: p = PAGE_READONLY; break;
3263 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3264 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3265 default:
3266 ShouldNotReachHere();
3267 }
3268
3269 DWORD old_status;
3270
3271 // Strange enough, but on Win32 one can change protection only for committed
3272 // memory, not a big deal anyway, as bytes less or equal than 64K
3273 if (!is_committed) {
3274 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3275 "cannot commit protection page");
3276 }
3277 // One cannot use os::guard_memory() here, as on Win32 guard page
3278 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3279 //
3280 // Pages in the region become guard pages. Any attempt to access a guard page
3281 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3282 // the guard page status. Guard pages thus act as a one-time access alarm.
3283 bool ret;
3284 if (UseNUMAInterleaving) {
3285 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3286 // so we must protect the chunks individually.
3287 ret = protect_pages_individually(addr, bytes, p, &old_status);
3288 } else {
3289 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3290 }
3291 #ifdef ASSERT
3292 if (!ret) {
3293 int err = os::get_last_error();
3294 char buf[256];
3295 size_t buf_len = os::lasterror(buf, sizeof(buf));
3296 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3297 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3298 buf_len != 0 ? buf : "<no_error_string>", err);
3299 }
3300 #endif
3301 return ret;
3302 }
3303
3304 bool os::guard_memory(char* addr, size_t bytes) {
3305 DWORD old_status;
3306 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3307 }
3308
3309 bool os::unguard_memory(char* addr, size_t bytes) {
3310 DWORD old_status;
3311 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3312 }
3313
3314 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3315 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3316 void os::numa_make_global(char *addr, size_t bytes) { }
3317 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3318 bool os::numa_topology_changed() { return false; }
3319 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3320 int os::numa_get_group_id() { return 0; }
3321 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3322 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3323 // Provide an answer for UMA systems
3324 ids[0] = 0;
3325 return 1;
3326 } else {
3327 // check for size bigger than actual groups_num
3328 size = MIN2(size, numa_get_groups_num());
3329 for (int i = 0; i < (int)size; i++) {
3330 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3331 }
3332 return size;
3333 }
3334 }
3335
3336 bool os::get_page_info(char *start, page_info* info) {
3337 return false;
3338 }
3339
3340 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3341 page_info* page_found) {
3342 return end;
3343 }
3344
3345 char* os::non_memory_address_word() {
3346 // Must never look like an address returned by reserve_memory,
3347 // even in its subfields (as defined by the CPU immediate fields,
3348 // if the CPU splits constants across multiple instructions).
3349 return (char*)-1;
3350 }
3351
3352 #define MAX_ERROR_COUNT 100
3353 #define SYS_THREAD_ERROR 0xffffffffUL
3354
3355 void os::pd_start_thread(Thread* thread) {
3356 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3357 // Returns previous suspend state:
3358 // 0: Thread was not suspended
3359 // 1: Thread is running now
3360 // >1: Thread is still suspended.
3361 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3362 }
3363
3364 class HighResolutionInterval : public CHeapObj<mtThread> {
3365 // The default timer resolution seems to be 10 milliseconds.
3366 // (Where is this written down?)
3367 // If someone wants to sleep for only a fraction of the default,
3368 // then we set the timer resolution down to 1 millisecond for
3369 // the duration of their interval.
3370 // We carefully set the resolution back, since otherwise we
3371 // seem to incur an overhead (3%?) that we don't need.
3372 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3373 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3374 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3375 // timeBeginPeriod() if the relative error exceeded some threshold.
3376 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3377 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3378 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3379 // resolution timers running.
3380 private:
3381 jlong resolution;
3382 public:
3383 HighResolutionInterval(jlong ms) {
3384 resolution = ms % 10L;
3385 if (resolution != 0) {
3386 MMRESULT result = timeBeginPeriod(1L);
3387 }
3388 }
3389 ~HighResolutionInterval() {
3390 if (resolution != 0) {
3391 MMRESULT result = timeEndPeriod(1L);
3392 }
3393 resolution = 0L;
3394 }
3395 };
3396
3397 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3398 jlong limit = (jlong) MAXDWORD;
3399
3400 while (ms > limit) {
3401 int res;
3402 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3403 return res;
3404 }
3405 ms -= limit;
3406 }
3407
3408 assert(thread == Thread::current(), "thread consistency check");
3409 OSThread* osthread = thread->osthread();
3410 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3411 int result;
3412 if (interruptable) {
3413 assert(thread->is_Java_thread(), "must be java thread");
3414 JavaThread *jt = (JavaThread *) thread;
3415 ThreadBlockInVM tbivm(jt);
3416
3417 jt->set_suspend_equivalent();
3418 // cleared by handle_special_suspend_equivalent_condition() or
3419 // java_suspend_self() via check_and_wait_while_suspended()
3420
3421 HANDLE events[1];
3422 events[0] = osthread->interrupt_event();
3423 HighResolutionInterval *phri=NULL;
3424 if (!ForceTimeHighResolution) {
3425 phri = new HighResolutionInterval(ms);
3426 }
3427 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3428 result = OS_TIMEOUT;
3429 } else {
3430 ResetEvent(osthread->interrupt_event());
3431 osthread->set_interrupted(false);
3432 result = OS_INTRPT;
3433 }
3434 delete phri; //if it is NULL, harmless
3435
3436 // were we externally suspended while we were waiting?
3437 jt->check_and_wait_while_suspended();
3438 } else {
3439 assert(!thread->is_Java_thread(), "must not be java thread");
3440 Sleep((long) ms);
3441 result = OS_TIMEOUT;
3442 }
3443 return result;
3444 }
3445
3446 // Short sleep, direct OS call.
3447 //
3448 // ms = 0, means allow others (if any) to run.
3449 //
3450 void os::naked_short_sleep(jlong ms) {
3451 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3452 Sleep(ms);
3453 }
3454
3455 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3456 void os::infinite_sleep() {
3457 while (true) { // sleep forever ...
3458 Sleep(100000); // ... 100 seconds at a time
3459 }
3460 }
3461
3462 typedef BOOL (WINAPI * STTSignature)(void);
3463
3464 void os::naked_yield() {
3465 // Consider passing back the return value from SwitchToThread().
3466 SwitchToThread();
3467 }
3468
3469 // Win32 only gives you access to seven real priorities at a time,
3470 // so we compress Java's ten down to seven. It would be better
3471 // if we dynamically adjusted relative priorities.
3472
3473 int os::java_to_os_priority[CriticalPriority + 1] = {
3474 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3475 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3476 THREAD_PRIORITY_LOWEST, // 2
3477 THREAD_PRIORITY_BELOW_NORMAL, // 3
3478 THREAD_PRIORITY_BELOW_NORMAL, // 4
3479 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3480 THREAD_PRIORITY_NORMAL, // 6
3481 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3482 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3483 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3484 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3485 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3486 };
3487
3488 int prio_policy1[CriticalPriority + 1] = {
3489 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3490 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3491 THREAD_PRIORITY_LOWEST, // 2
3492 THREAD_PRIORITY_BELOW_NORMAL, // 3
3493 THREAD_PRIORITY_BELOW_NORMAL, // 4
3494 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3495 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3496 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3497 THREAD_PRIORITY_HIGHEST, // 8
3498 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3499 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3500 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3501 };
3502
3503 static int prio_init() {
3504 // If ThreadPriorityPolicy is 1, switch tables
3505 if (ThreadPriorityPolicy == 1) {
3506 int i;
3507 for (i = 0; i < CriticalPriority + 1; i++) {
3508 os::java_to_os_priority[i] = prio_policy1[i];
3509 }
3510 }
3511 if (UseCriticalJavaThreadPriority) {
3512 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3513 }
3514 return 0;
3515 }
3516
3517 OSReturn os::set_native_priority(Thread* thread, int priority) {
3518 if (!UseThreadPriorities) return OS_OK;
3519 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3520 return ret ? OS_OK : OS_ERR;
3521 }
3522
3523 OSReturn os::get_native_priority(const Thread* const thread,
3524 int* priority_ptr) {
3525 if (!UseThreadPriorities) {
3526 *priority_ptr = java_to_os_priority[NormPriority];
3527 return OS_OK;
3528 }
3529 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3530 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3531 assert(false, "GetThreadPriority failed");
3532 return OS_ERR;
3533 }
3534 *priority_ptr = os_prio;
3535 return OS_OK;
3536 }
3537
3538
3539 // Hint to the underlying OS that a task switch would not be good.
3540 // Void return because it's a hint and can fail.
3541 void os::hint_no_preempt() {}
3542
3543 void os::interrupt(Thread* thread) {
3544 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3545 Threads_lock->owned_by_self(),
3546 "possibility of dangling Thread pointer");
3547
3548 OSThread* osthread = thread->osthread();
3549 osthread->set_interrupted(true);
3550 // More than one thread can get here with the same value of osthread,
3551 // resulting in multiple notifications. We do, however, want the store
3552 // to interrupted() to be visible to other threads before we post
3553 // the interrupt event.
3554 OrderAccess::release();
3555 SetEvent(osthread->interrupt_event());
3556 // For JSR166: unpark after setting status
3557 if (thread->is_Java_thread()) {
3558 ((JavaThread*)thread)->parker()->unpark();
3559 }
3560
3561 ParkEvent * ev = thread->_ParkEvent;
3562 if (ev != NULL) ev->unpark();
3563 }
3564
3565
3566 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3567 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3568 "possibility of dangling Thread pointer");
3569
3570 OSThread* osthread = thread->osthread();
3571 // There is no synchronization between the setting of the interrupt
3572 // and it being cleared here. It is critical - see 6535709 - that
3573 // we only clear the interrupt state, and reset the interrupt event,
3574 // if we are going to report that we were indeed interrupted - else
3575 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3576 // depending on the timing. By checking thread interrupt event to see
3577 // if the thread gets real interrupt thus prevent spurious wakeup.
3578 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3579 if (interrupted && clear_interrupted) {
3580 osthread->set_interrupted(false);
3581 ResetEvent(osthread->interrupt_event());
3582 } // Otherwise leave the interrupted state alone
3583
3584 return interrupted;
3585 }
3586
3587 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3588 ExtendedPC os::get_thread_pc(Thread* thread) {
3589 CONTEXT context;
3590 context.ContextFlags = CONTEXT_CONTROL;
3591 HANDLE handle = thread->osthread()->thread_handle();
3592 if (GetThreadContext(handle, &context)) {
3593 #ifdef _M_AMD64
3594 return ExtendedPC((address) context.Rip);
3595 #else
3596 return ExtendedPC((address) context.Eip);
3597 #endif
3598 } else {
3599 return ExtendedPC(NULL);
3600 }
3601 }
3602
3603 // GetCurrentThreadId() returns DWORD
3604 intx os::current_thread_id() { return GetCurrentThreadId(); }
3605
3606 static int _initial_pid = 0;
3607
3608 int os::current_process_id() {
3609 return (_initial_pid ? _initial_pid : _getpid());
3610 }
3611
3612 int os::win32::_vm_page_size = 0;
3613 int os::win32::_vm_allocation_granularity = 0;
3614 int os::win32::_processor_type = 0;
3615 // Processor level is not available on non-NT systems, use vm_version instead
3616 int os::win32::_processor_level = 0;
3617 julong os::win32::_physical_memory = 0;
3618 size_t os::win32::_default_stack_size = 0;
3619
3620 intx os::win32::_os_thread_limit = 0;
3621 volatile intx os::win32::_os_thread_count = 0;
3622
3623 bool os::win32::_is_windows_server = false;
3624
3625 // 6573254
3626 // Currently, the bug is observed across all the supported Windows releases,
3627 // including the latest one (as of this writing - Windows Server 2012 R2)
3628 bool os::win32::_has_exit_bug = true;
3629
3630 void os::win32::initialize_system_info() {
3631 SYSTEM_INFO si;
3632 GetSystemInfo(&si);
3633 _vm_page_size = si.dwPageSize;
3634 _vm_allocation_granularity = si.dwAllocationGranularity;
3635 _processor_type = si.dwProcessorType;
3636 _processor_level = si.wProcessorLevel;
3637 set_processor_count(si.dwNumberOfProcessors);
3638
3639 MEMORYSTATUSEX ms;
3640 ms.dwLength = sizeof(ms);
3641
3642 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3643 // dwMemoryLoad (% of memory in use)
3644 GlobalMemoryStatusEx(&ms);
3645 _physical_memory = ms.ullTotalPhys;
3646
3647 if (FLAG_IS_DEFAULT(MaxRAM)) {
3648 // Adjust MaxRAM according to the maximum virtual address space available.
3649 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3650 }
3651
3652 OSVERSIONINFOEX oi;
3653 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3654 GetVersionEx((OSVERSIONINFO*)&oi);
3655 switch (oi.dwPlatformId) {
3656 case VER_PLATFORM_WIN32_NT:
3657 {
3658 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3659 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3660 oi.wProductType == VER_NT_SERVER) {
3661 _is_windows_server = true;
3662 }
3663 }
3664 break;
3665 default: fatal("Unknown platform");
3666 }
3667
3668 _default_stack_size = os::current_stack_size();
3669 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3670 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3671 "stack size not a multiple of page size");
3672
3673 initialize_performance_counter();
3674 }
3675
3676
3677 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3678 int ebuflen) {
3679 char path[MAX_PATH];
3680 DWORD size;
3681 DWORD pathLen = (DWORD)sizeof(path);
3682 HINSTANCE result = NULL;
3683
3684 // only allow library name without path component
3685 assert(strchr(name, '\\') == NULL, "path not allowed");
3686 assert(strchr(name, ':') == NULL, "path not allowed");
3687 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3688 jio_snprintf(ebuf, ebuflen,
3689 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3690 return NULL;
3691 }
3692
3693 // search system directory
3694 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3695 if (size >= pathLen) {
3696 return NULL; // truncated
3697 }
3698 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3699 return NULL; // truncated
3700 }
3701 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3702 return result;
3703 }
3704 }
3705
3706 // try Windows directory
3707 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3708 if (size >= pathLen) {
3709 return NULL; // truncated
3710 }
3711 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3712 return NULL; // truncated
3713 }
3714 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3715 return result;
3716 }
3717 }
3718
3719 jio_snprintf(ebuf, ebuflen,
3720 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3721 return NULL;
3722 }
3723
3724 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3725 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3726
3727 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3728 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3729 return TRUE;
3730 }
3731
3732 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3733 // Basic approach:
3734 // - Each exiting thread registers its intent to exit and then does so.
3735 // - A thread trying to terminate the process must wait for all
3736 // threads currently exiting to complete their exit.
3737
3738 if (os::win32::has_exit_bug()) {
3739 // The array holds handles of the threads that have started exiting by calling
3740 // _endthreadex().
3741 // Should be large enough to avoid blocking the exiting thread due to lack of
3742 // a free slot.
3743 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3744 static int handle_count = 0;
3745
3746 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3747 static CRITICAL_SECTION crit_sect;
3748 static volatile jint process_exiting = 0;
3749 int i, j;
3750 DWORD res;
3751 HANDLE hproc, hthr;
3752
3753 // We only attempt to register threads until a process exiting
3754 // thread manages to set the process_exiting flag. Any threads
3755 // that come through here after the process_exiting flag is set
3756 // are unregistered and will be caught in the SuspendThread()
3757 // infinite loop below.
3758 bool registered = false;
3759
3760 // The first thread that reached this point, initializes the critical section.
3761 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3762 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3763 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3764 if (what != EPT_THREAD) {
3765 // Atomically set process_exiting before the critical section
3766 // to increase the visibility between racing threads.
3767 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3768 }
3769 EnterCriticalSection(&crit_sect);
3770
3771 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3772 // Remove from the array those handles of the threads that have completed exiting.
3773 for (i = 0, j = 0; i < handle_count; ++i) {
3774 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3775 if (res == WAIT_TIMEOUT) {
3776 handles[j++] = handles[i];
3777 } else {
3778 if (res == WAIT_FAILED) {
3779 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3780 GetLastError(), __FILE__, __LINE__);
3781 }
3782 // Don't keep the handle, if we failed waiting for it.
3783 CloseHandle(handles[i]);
3784 }
3785 }
3786
3787 // If there's no free slot in the array of the kept handles, we'll have to
3788 // wait until at least one thread completes exiting.
3789 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3790 // Raise the priority of the oldest exiting thread to increase its chances
3791 // to complete sooner.
3792 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3793 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3794 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3795 i = (res - WAIT_OBJECT_0);
3796 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3797 for (; i < handle_count; ++i) {
3798 handles[i] = handles[i + 1];
3799 }
3800 } else {
3801 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3802 (res == WAIT_FAILED ? "failed" : "timed out"),
3803 GetLastError(), __FILE__, __LINE__);
3804 // Don't keep handles, if we failed waiting for them.
3805 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3806 CloseHandle(handles[i]);
3807 }
3808 handle_count = 0;
3809 }
3810 }
3811
3812 // Store a duplicate of the current thread handle in the array of handles.
3813 hproc = GetCurrentProcess();
3814 hthr = GetCurrentThread();
3815 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3816 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3817 warning("DuplicateHandle failed (%u) in %s: %d\n",
3818 GetLastError(), __FILE__, __LINE__);
3819
3820 // We can't register this thread (no more handles) so this thread
3821 // may be racing with a thread that is calling exit(). If the thread
3822 // that is calling exit() has managed to set the process_exiting
3823 // flag, then this thread will be caught in the SuspendThread()
3824 // infinite loop below which closes that race. A small timing
3825 // window remains before the process_exiting flag is set, but it
3826 // is only exposed when we are out of handles.
3827 } else {
3828 ++handle_count;
3829 registered = true;
3830
3831 // The current exiting thread has stored its handle in the array, and now
3832 // should leave the critical section before calling _endthreadex().
3833 }
3834
3835 } else if (what != EPT_THREAD && handle_count > 0) {
3836 jlong start_time, finish_time, timeout_left;
3837 // Before ending the process, make sure all the threads that had called
3838 // _endthreadex() completed.
3839
3840 // Set the priority level of the current thread to the same value as
3841 // the priority level of exiting threads.
3842 // This is to ensure it will be given a fair chance to execute if
3843 // the timeout expires.
3844 hthr = GetCurrentThread();
3845 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3846 start_time = os::javaTimeNanos();
3847 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3848 for (i = 0; ; ) {
3849 int portion_count = handle_count - i;
3850 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3851 portion_count = MAXIMUM_WAIT_OBJECTS;
3852 }
3853 for (j = 0; j < portion_count; ++j) {
3854 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3855 }
3856 timeout_left = (finish_time - start_time) / 1000000L;
3857 if (timeout_left < 0) {
3858 timeout_left = 0;
3859 }
3860 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3861 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3862 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3863 (res == WAIT_FAILED ? "failed" : "timed out"),
3864 GetLastError(), __FILE__, __LINE__);
3865 // Reset portion_count so we close the remaining
3866 // handles due to this error.
3867 portion_count = handle_count - i;
3868 }
3869 for (j = 0; j < portion_count; ++j) {
3870 CloseHandle(handles[i + j]);
3871 }
3872 if ((i += portion_count) >= handle_count) {
3873 break;
3874 }
3875 start_time = os::javaTimeNanos();
3876 }
3877 handle_count = 0;
3878 }
3879
3880 LeaveCriticalSection(&crit_sect);
3881 }
3882
3883 if (!registered &&
3884 OrderAccess::load_acquire(&process_exiting) != 0 &&
3885 process_exiting != (jint)GetCurrentThreadId()) {
3886 // Some other thread is about to call exit(), so we don't let
3887 // the current unregistered thread proceed to exit() or _endthreadex()
3888 while (true) {
3889 SuspendThread(GetCurrentThread());
3890 // Avoid busy-wait loop, if SuspendThread() failed.
3891 Sleep(EXIT_TIMEOUT);
3892 }
3893 }
3894 }
3895
3896 // We are here if either
3897 // - there's no 'race at exit' bug on this OS release;
3898 // - initialization of the critical section failed (unlikely);
3899 // - the current thread has registered itself and left the critical section;
3900 // - the process-exiting thread has raised the flag and left the critical section.
3901 if (what == EPT_THREAD) {
3902 _endthreadex((unsigned)exit_code);
3903 } else if (what == EPT_PROCESS) {
3904 ::exit(exit_code);
3905 } else {
3906 _exit(exit_code);
3907 }
3908
3909 // Should not reach here
3910 return exit_code;
3911 }
3912
3913 #undef EXIT_TIMEOUT
3914
3915 void os::win32::setmode_streams() {
3916 _setmode(_fileno(stdin), _O_BINARY);
3917 _setmode(_fileno(stdout), _O_BINARY);
3918 _setmode(_fileno(stderr), _O_BINARY);
3919 }
3920
3921
3922 bool os::is_debugger_attached() {
3923 return IsDebuggerPresent() ? true : false;
3924 }
3925
3926
3927 void os::wait_for_keypress_at_exit(void) {
3928 if (PauseAtExit) {
3929 fprintf(stderr, "Press any key to continue...\n");
3930 fgetc(stdin);
3931 }
3932 }
3933
3934
3935 bool os::message_box(const char* title, const char* message) {
3936 int result = MessageBox(NULL, message, title,
3937 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3938 return result == IDYES;
3939 }
3940
3941 #ifndef PRODUCT
3942 #ifndef _WIN64
3943 // Helpers to check whether NX protection is enabled
3944 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3945 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3946 pex->ExceptionRecord->NumberParameters > 0 &&
3947 pex->ExceptionRecord->ExceptionInformation[0] ==
3948 EXCEPTION_INFO_EXEC_VIOLATION) {
3949 return EXCEPTION_EXECUTE_HANDLER;
3950 }
3951 return EXCEPTION_CONTINUE_SEARCH;
3952 }
3953
3954 void nx_check_protection() {
3955 // If NX is enabled we'll get an exception calling into code on the stack
3956 char code[] = { (char)0xC3 }; // ret
3957 void *code_ptr = (void *)code;
3958 __try {
3959 __asm call code_ptr
3960 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3961 tty->print_raw_cr("NX protection detected.");
3962 }
3963 }
3964 #endif // _WIN64
3965 #endif // PRODUCT
3966
3967 // This is called _before_ the global arguments have been parsed
3968 void os::init(void) {
3969 _initial_pid = _getpid();
3970
3971 init_random(1234567);
3972
3973 win32::initialize_system_info();
3974 win32::setmode_streams();
3975 init_page_sizes((size_t) win32::vm_page_size());
3976
3977 // This may be overridden later when argument processing is done.
3978 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
3979
3980 // Initialize main_process and main_thread
3981 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3982 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3983 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3984 fatal("DuplicateHandle failed\n");
3985 }
3986 main_thread_id = (int) GetCurrentThreadId();
3987
3988 // initialize fast thread access - only used for 32-bit
3989 win32::initialize_thread_ptr_offset();
3990 }
3991
3992 // To install functions for atexit processing
3993 extern "C" {
3994 static void perfMemory_exit_helper() {
3995 perfMemory_exit();
3996 }
3997 }
3998
3999 static jint initSock();
4000
4001 // this is called _after_ the global arguments have been parsed
4002 jint os::init_2(void) {
4003 // Allocate a single page and mark it as readable for safepoint polling
4004 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4005 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4006
4007 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4008 guarantee(return_page != NULL, "Commit Failed for polling page");
4009
4010 os::set_polling_page(polling_page);
4011 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4012
4013 if (!UseMembar) {
4014 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4015 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4016
4017 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4018 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4019
4020 os::set_memory_serialize_page(mem_serialize_page);
4021 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4022 }
4023
4024 // Setup Windows Exceptions
4025
4026 // for debugging float code generation bugs
4027 if (ForceFloatExceptions) {
4028 #ifndef _WIN64
4029 static long fp_control_word = 0;
4030 __asm { fstcw fp_control_word }
4031 // see Intel PPro Manual, Vol. 2, p 7-16
4032 const long precision = 0x20;
4033 const long underflow = 0x10;
4034 const long overflow = 0x08;
4035 const long zero_div = 0x04;
4036 const long denorm = 0x02;
4037 const long invalid = 0x01;
4038 fp_control_word |= invalid;
4039 __asm { fldcw fp_control_word }
4040 #endif
4041 }
4042
4043 // If stack_commit_size is 0, windows will reserve the default size,
4044 // but only commit a small portion of it.
4045 size_t stack_commit_size = align_size_up_((size_t)ThreadStackSize * K, (size_t)os::vm_page_size());
4046 size_t default_reserve_size = os::win32::default_stack_size();
4047 size_t actual_reserve_size = stack_commit_size;
4048 if (stack_commit_size < default_reserve_size) {
4049 // If stack_commit_size == 0, we want this too
4050 actual_reserve_size = default_reserve_size;
4051 }
4052
4053 // Check minimum allowable stack size for thread creation and to initialize
4054 // the java system classes, including StackOverflowError - depends on page
4055 // size. Add two 4K pages for compiler2 recursion in main thread.
4056 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4057 // class initialization depending on 32 or 64 bit VM.
4058 size_t min_stack_allowed =
4059 (size_t)(JavaThread::stack_guard_zone_size() +
4060 JavaThread::stack_shadow_zone_size() +
4061 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4062
4063 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size());
4064
4065 if (actual_reserve_size < min_stack_allowed) {
4066 tty->print_cr("\nThe Java thread stack size specified is too small. "
4067 "Specify at least %dk",
4068 min_stack_allowed / K);
4069 return JNI_ERR;
4070 }
4071
4072 JavaThread::set_stack_size_at_create(stack_commit_size);
4073
4074 // Calculate theoretical max. size of Threads to guard gainst artifical
4075 // out-of-memory situations, where all available address-space has been
4076 // reserved by thread stacks.
4077 assert(actual_reserve_size != 0, "Must have a stack");
4078
4079 // Calculate the thread limit when we should start doing Virtual Memory
4080 // banging. Currently when the threads will have used all but 200Mb of space.
4081 //
4082 // TODO: consider performing a similar calculation for commit size instead
4083 // as reserve size, since on a 64-bit platform we'll run into that more
4084 // often than running out of virtual memory space. We can use the
4085 // lower value of the two calculations as the os_thread_limit.
4086 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4087 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4088
4089 // at exit methods are called in the reverse order of their registration.
4090 // there is no limit to the number of functions registered. atexit does
4091 // not set errno.
4092
4093 if (PerfAllowAtExitRegistration) {
4094 // only register atexit functions if PerfAllowAtExitRegistration is set.
4095 // atexit functions can be delayed until process exit time, which
4096 // can be problematic for embedded VM situations. Embedded VMs should
4097 // call DestroyJavaVM() to assure that VM resources are released.
4098
4099 // note: perfMemory_exit_helper atexit function may be removed in
4100 // the future if the appropriate cleanup code can be added to the
4101 // VM_Exit VMOperation's doit method.
4102 if (atexit(perfMemory_exit_helper) != 0) {
4103 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4104 }
4105 }
4106
4107 #ifndef _WIN64
4108 // Print something if NX is enabled (win32 on AMD64)
4109 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4110 #endif
4111
4112 // initialize thread priority policy
4113 prio_init();
4114
4115 if (UseNUMA && !ForceNUMA) {
4116 UseNUMA = false; // We don't fully support this yet
4117 }
4118
4119 if (UseNUMAInterleaving) {
4120 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4121 bool success = numa_interleaving_init();
4122 if (!success) UseNUMAInterleaving = false;
4123 }
4124
4125 if (initSock() != JNI_OK) {
4126 return JNI_ERR;
4127 }
4128
4129 return JNI_OK;
4130 }
4131
4132 // Mark the polling page as unreadable
4133 void os::make_polling_page_unreadable(void) {
4134 DWORD old_status;
4135 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4136 PAGE_NOACCESS, &old_status)) {
4137 fatal("Could not disable polling page");
4138 }
4139 }
4140
4141 // Mark the polling page as readable
4142 void os::make_polling_page_readable(void) {
4143 DWORD old_status;
4144 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4145 PAGE_READONLY, &old_status)) {
4146 fatal("Could not enable polling page");
4147 }
4148 }
4149
4150
4151 int os::stat(const char *path, struct stat *sbuf) {
4152 char pathbuf[MAX_PATH];
4153 if (strlen(path) > MAX_PATH - 1) {
4154 errno = ENAMETOOLONG;
4155 return -1;
4156 }
4157 os::native_path(strcpy(pathbuf, path));
4158 int ret = ::stat(pathbuf, sbuf);
4159 if (sbuf != NULL && UseUTCFileTimestamp) {
4160 // Fix for 6539723. st_mtime returned from stat() is dependent on
4161 // the system timezone and so can return different values for the
4162 // same file if/when daylight savings time changes. This adjustment
4163 // makes sure the same timestamp is returned regardless of the TZ.
4164 //
4165 // See:
4166 // http://msdn.microsoft.com/library/
4167 // default.asp?url=/library/en-us/sysinfo/base/
4168 // time_zone_information_str.asp
4169 // and
4170 // http://msdn.microsoft.com/library/default.asp?url=
4171 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4172 //
4173 // NOTE: there is a insidious bug here: If the timezone is changed
4174 // after the call to stat() but before 'GetTimeZoneInformation()', then
4175 // the adjustment we do here will be wrong and we'll return the wrong
4176 // value (which will likely end up creating an invalid class data
4177 // archive). Absent a better API for this, or some time zone locking
4178 // mechanism, we'll have to live with this risk.
4179 TIME_ZONE_INFORMATION tz;
4180 DWORD tzid = GetTimeZoneInformation(&tz);
4181 int daylightBias =
4182 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4183 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4184 }
4185 return ret;
4186 }
4187
4188
4189 #define FT2INT64(ft) \
4190 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4191
4192
4193 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4194 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4195 // of a thread.
4196 //
4197 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4198 // the fast estimate available on the platform.
4199
4200 // current_thread_cpu_time() is not optimized for Windows yet
4201 jlong os::current_thread_cpu_time() {
4202 // return user + sys since the cost is the same
4203 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4204 }
4205
4206 jlong os::thread_cpu_time(Thread* thread) {
4207 // consistent with what current_thread_cpu_time() returns.
4208 return os::thread_cpu_time(thread, true /* user+sys */);
4209 }
4210
4211 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4212 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4213 }
4214
4215 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4216 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4217 // If this function changes, os::is_thread_cpu_time_supported() should too
4218 FILETIME CreationTime;
4219 FILETIME ExitTime;
4220 FILETIME KernelTime;
4221 FILETIME UserTime;
4222
4223 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4224 &ExitTime, &KernelTime, &UserTime) == 0) {
4225 return -1;
4226 } else if (user_sys_cpu_time) {
4227 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4228 } else {
4229 return FT2INT64(UserTime) * 100;
4230 }
4231 }
4232
4233 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4234 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4235 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4236 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4237 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4238 }
4239
4240 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4241 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4242 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4243 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4244 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4245 }
4246
4247 bool os::is_thread_cpu_time_supported() {
4248 // see os::thread_cpu_time
4249 FILETIME CreationTime;
4250 FILETIME ExitTime;
4251 FILETIME KernelTime;
4252 FILETIME UserTime;
4253
4254 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4255 &KernelTime, &UserTime) == 0) {
4256 return false;
4257 } else {
4258 return true;
4259 }
4260 }
4261
4262 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4263 // It does have primitives (PDH API) to get CPU usage and run queue length.
4264 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4265 // If we wanted to implement loadavg on Windows, we have a few options:
4266 //
4267 // a) Query CPU usage and run queue length and "fake" an answer by
4268 // returning the CPU usage if it's under 100%, and the run queue
4269 // length otherwise. It turns out that querying is pretty slow
4270 // on Windows, on the order of 200 microseconds on a fast machine.
4271 // Note that on the Windows the CPU usage value is the % usage
4272 // since the last time the API was called (and the first call
4273 // returns 100%), so we'd have to deal with that as well.
4274 //
4275 // b) Sample the "fake" answer using a sampling thread and store
4276 // the answer in a global variable. The call to loadavg would
4277 // just return the value of the global, avoiding the slow query.
4278 //
4279 // c) Sample a better answer using exponential decay to smooth the
4280 // value. This is basically the algorithm used by UNIX kernels.
4281 //
4282 // Note that sampling thread starvation could affect both (b) and (c).
4283 int os::loadavg(double loadavg[], int nelem) {
4284 return -1;
4285 }
4286
4287
4288 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4289 bool os::dont_yield() {
4290 return DontYieldALot;
4291 }
4292
4293 // This method is a slightly reworked copy of JDK's sysOpen
4294 // from src/windows/hpi/src/sys_api_md.c
4295
4296 int os::open(const char *path, int oflag, int mode) {
4297 char pathbuf[MAX_PATH];
4298
4299 if (strlen(path) > MAX_PATH - 1) {
4300 errno = ENAMETOOLONG;
4301 return -1;
4302 }
4303 os::native_path(strcpy(pathbuf, path));
4304 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4305 }
4306
4307 FILE* os::open(int fd, const char* mode) {
4308 return ::_fdopen(fd, mode);
4309 }
4310
4311 // Is a (classpath) directory empty?
4312 bool os::dir_is_empty(const char* path) {
4313 WIN32_FIND_DATA fd;
4314 HANDLE f = FindFirstFile(path, &fd);
4315 if (f == INVALID_HANDLE_VALUE) {
4316 return true;
4317 }
4318 FindClose(f);
4319 return false;
4320 }
4321
4322 // create binary file, rewriting existing file if required
4323 int os::create_binary_file(const char* path, bool rewrite_existing) {
4324 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4325 if (!rewrite_existing) {
4326 oflags |= _O_EXCL;
4327 }
4328 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4329 }
4330
4331 // return current position of file pointer
4332 jlong os::current_file_offset(int fd) {
4333 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4334 }
4335
4336 // move file pointer to the specified offset
4337 jlong os::seek_to_file_offset(int fd, jlong offset) {
4338 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4339 }
4340
4341
4342 jlong os::lseek(int fd, jlong offset, int whence) {
4343 return (jlong) ::_lseeki64(fd, offset, whence);
4344 }
4345
4346 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4347 OVERLAPPED ov;
4348 DWORD nread;
4349 BOOL result;
4350
4351 ZeroMemory(&ov, sizeof(ov));
4352 ov.Offset = (DWORD)offset;
4353 ov.OffsetHigh = (DWORD)(offset >> 32);
4354
4355 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4356
4357 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4358
4359 return result ? nread : 0;
4360 }
4361
4362
4363 // This method is a slightly reworked copy of JDK's sysNativePath
4364 // from src/windows/hpi/src/path_md.c
4365
4366 // Convert a pathname to native format. On win32, this involves forcing all
4367 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4368 // sometimes rejects '/') and removing redundant separators. The input path is
4369 // assumed to have been converted into the character encoding used by the local
4370 // system. Because this might be a double-byte encoding, care is taken to
4371 // treat double-byte lead characters correctly.
4372 //
4373 // This procedure modifies the given path in place, as the result is never
4374 // longer than the original. There is no error return; this operation always
4375 // succeeds.
4376 char * os::native_path(char *path) {
4377 char *src = path, *dst = path, *end = path;
4378 char *colon = NULL; // If a drive specifier is found, this will
4379 // point to the colon following the drive letter
4380
4381 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4382 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4383 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4384
4385 // Check for leading separators
4386 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4387 while (isfilesep(*src)) {
4388 src++;
4389 }
4390
4391 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4392 // Remove leading separators if followed by drive specifier. This
4393 // hack is necessary to support file URLs containing drive
4394 // specifiers (e.g., "file://c:/path"). As a side effect,
4395 // "/c:/path" can be used as an alternative to "c:/path".
4396 *dst++ = *src++;
4397 colon = dst;
4398 *dst++ = ':';
4399 src++;
4400 } else {
4401 src = path;
4402 if (isfilesep(src[0]) && isfilesep(src[1])) {
4403 // UNC pathname: Retain first separator; leave src pointed at
4404 // second separator so that further separators will be collapsed
4405 // into the second separator. The result will be a pathname
4406 // beginning with "\\\\" followed (most likely) by a host name.
4407 src = dst = path + 1;
4408 path[0] = '\\'; // Force first separator to '\\'
4409 }
4410 }
4411
4412 end = dst;
4413
4414 // Remove redundant separators from remainder of path, forcing all
4415 // separators to be '\\' rather than '/'. Also, single byte space
4416 // characters are removed from the end of the path because those
4417 // are not legal ending characters on this operating system.
4418 //
4419 while (*src != '\0') {
4420 if (isfilesep(*src)) {
4421 *dst++ = '\\'; src++;
4422 while (isfilesep(*src)) src++;
4423 if (*src == '\0') {
4424 // Check for trailing separator
4425 end = dst;
4426 if (colon == dst - 2) break; // "z:\\"
4427 if (dst == path + 1) break; // "\\"
4428 if (dst == path + 2 && isfilesep(path[0])) {
4429 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4430 // beginning of a UNC pathname. Even though it is not, by
4431 // itself, a valid UNC pathname, we leave it as is in order
4432 // to be consistent with the path canonicalizer as well
4433 // as the win32 APIs, which treat this case as an invalid
4434 // UNC pathname rather than as an alias for the root
4435 // directory of the current drive.
4436 break;
4437 }
4438 end = --dst; // Path does not denote a root directory, so
4439 // remove trailing separator
4440 break;
4441 }
4442 end = dst;
4443 } else {
4444 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4445 *dst++ = *src++;
4446 if (*src) *dst++ = *src++;
4447 end = dst;
4448 } else { // Copy a single-byte character
4449 char c = *src++;
4450 *dst++ = c;
4451 // Space is not a legal ending character
4452 if (c != ' ') end = dst;
4453 }
4454 }
4455 }
4456
4457 *end = '\0';
4458
4459 // For "z:", add "." to work around a bug in the C runtime library
4460 if (colon == dst - 1) {
4461 path[2] = '.';
4462 path[3] = '\0';
4463 }
4464
4465 return path;
4466 }
4467
4468 // This code is a copy of JDK's sysSetLength
4469 // from src/windows/hpi/src/sys_api_md.c
4470
4471 int os::ftruncate(int fd, jlong length) {
4472 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4473 long high = (long)(length >> 32);
4474 DWORD ret;
4475
4476 if (h == (HANDLE)(-1)) {
4477 return -1;
4478 }
4479
4480 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4481 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4482 return -1;
4483 }
4484
4485 if (::SetEndOfFile(h) == FALSE) {
4486 return -1;
4487 }
4488
4489 return 0;
4490 }
4491
4492 int os::get_fileno(FILE* fp) {
4493 return _fileno(fp);
4494 }
4495
4496 // This code is a copy of JDK's sysSync
4497 // from src/windows/hpi/src/sys_api_md.c
4498 // except for the legacy workaround for a bug in Win 98
4499
4500 int os::fsync(int fd) {
4501 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4502
4503 if ((!::FlushFileBuffers(handle)) &&
4504 (GetLastError() != ERROR_ACCESS_DENIED)) {
4505 // from winerror.h
4506 return -1;
4507 }
4508 return 0;
4509 }
4510
4511 static int nonSeekAvailable(int, long *);
4512 static int stdinAvailable(int, long *);
4513
4514 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4515 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4516
4517 // This code is a copy of JDK's sysAvailable
4518 // from src/windows/hpi/src/sys_api_md.c
4519
4520 int os::available(int fd, jlong *bytes) {
4521 jlong cur, end;
4522 struct _stati64 stbuf64;
4523
4524 if (::_fstati64(fd, &stbuf64) >= 0) {
4525 int mode = stbuf64.st_mode;
4526 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4527 int ret;
4528 long lpbytes;
4529 if (fd == 0) {
4530 ret = stdinAvailable(fd, &lpbytes);
4531 } else {
4532 ret = nonSeekAvailable(fd, &lpbytes);
4533 }
4534 (*bytes) = (jlong)(lpbytes);
4535 return ret;
4536 }
4537 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4538 return FALSE;
4539 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4540 return FALSE;
4541 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4542 return FALSE;
4543 }
4544 *bytes = end - cur;
4545 return TRUE;
4546 } else {
4547 return FALSE;
4548 }
4549 }
4550
4551 void os::flockfile(FILE* fp) {
4552 _lock_file(fp);
4553 }
4554
4555 void os::funlockfile(FILE* fp) {
4556 _unlock_file(fp);
4557 }
4558
4559 // This code is a copy of JDK's nonSeekAvailable
4560 // from src/windows/hpi/src/sys_api_md.c
4561
4562 static int nonSeekAvailable(int fd, long *pbytes) {
4563 // This is used for available on non-seekable devices
4564 // (like both named and anonymous pipes, such as pipes
4565 // connected to an exec'd process).
4566 // Standard Input is a special case.
4567 HANDLE han;
4568
4569 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4570 return FALSE;
4571 }
4572
4573 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4574 // PeekNamedPipe fails when at EOF. In that case we
4575 // simply make *pbytes = 0 which is consistent with the
4576 // behavior we get on Solaris when an fd is at EOF.
4577 // The only alternative is to raise an Exception,
4578 // which isn't really warranted.
4579 //
4580 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4581 return FALSE;
4582 }
4583 *pbytes = 0;
4584 }
4585 return TRUE;
4586 }
4587
4588 #define MAX_INPUT_EVENTS 2000
4589
4590 // This code is a copy of JDK's stdinAvailable
4591 // from src/windows/hpi/src/sys_api_md.c
4592
4593 static int stdinAvailable(int fd, long *pbytes) {
4594 HANDLE han;
4595 DWORD numEventsRead = 0; // Number of events read from buffer
4596 DWORD numEvents = 0; // Number of events in buffer
4597 DWORD i = 0; // Loop index
4598 DWORD curLength = 0; // Position marker
4599 DWORD actualLength = 0; // Number of bytes readable
4600 BOOL error = FALSE; // Error holder
4601 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4602
4603 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4604 return FALSE;
4605 }
4606
4607 // Construct an array of input records in the console buffer
4608 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4609 if (error == 0) {
4610 return nonSeekAvailable(fd, pbytes);
4611 }
4612
4613 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4614 if (numEvents > MAX_INPUT_EVENTS) {
4615 numEvents = MAX_INPUT_EVENTS;
4616 }
4617
4618 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4619 if (lpBuffer == NULL) {
4620 return FALSE;
4621 }
4622
4623 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4624 if (error == 0) {
4625 os::free(lpBuffer);
4626 return FALSE;
4627 }
4628
4629 // Examine input records for the number of bytes available
4630 for (i=0; i<numEvents; i++) {
4631 if (lpBuffer[i].EventType == KEY_EVENT) {
4632
4633 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4634 &(lpBuffer[i].Event);
4635 if (keyRecord->bKeyDown == TRUE) {
4636 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4637 curLength++;
4638 if (*keyPressed == '\r') {
4639 actualLength = curLength;
4640 }
4641 }
4642 }
4643 }
4644
4645 if (lpBuffer != NULL) {
4646 os::free(lpBuffer);
4647 }
4648
4649 *pbytes = (long) actualLength;
4650 return TRUE;
4651 }
4652
4653 // Map a block of memory.
4654 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4655 char *addr, size_t bytes, bool read_only,
4656 bool allow_exec) {
4657 HANDLE hFile;
4658 char* base;
4659
4660 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4661 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4662 if (hFile == NULL) {
4663 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4664 return NULL;
4665 }
4666
4667 if (allow_exec) {
4668 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4669 // unless it comes from a PE image (which the shared archive is not.)
4670 // Even VirtualProtect refuses to give execute access to mapped memory
4671 // that was not previously executable.
4672 //
4673 // Instead, stick the executable region in anonymous memory. Yuck.
4674 // Penalty is that ~4 pages will not be shareable - in the future
4675 // we might consider DLLizing the shared archive with a proper PE
4676 // header so that mapping executable + sharing is possible.
4677
4678 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4679 PAGE_READWRITE);
4680 if (base == NULL) {
4681 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4682 CloseHandle(hFile);
4683 return NULL;
4684 }
4685
4686 DWORD bytes_read;
4687 OVERLAPPED overlapped;
4688 overlapped.Offset = (DWORD)file_offset;
4689 overlapped.OffsetHigh = 0;
4690 overlapped.hEvent = NULL;
4691 // ReadFile guarantees that if the return value is true, the requested
4692 // number of bytes were read before returning.
4693 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4694 if (!res) {
4695 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4696 release_memory(base, bytes);
4697 CloseHandle(hFile);
4698 return NULL;
4699 }
4700 } else {
4701 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4702 NULL /* file_name */);
4703 if (hMap == NULL) {
4704 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4705 CloseHandle(hFile);
4706 return NULL;
4707 }
4708
4709 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4710 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4711 (DWORD)bytes, addr);
4712 if (base == NULL) {
4713 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4714 CloseHandle(hMap);
4715 CloseHandle(hFile);
4716 return NULL;
4717 }
4718
4719 if (CloseHandle(hMap) == 0) {
4720 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4721 CloseHandle(hFile);
4722 return base;
4723 }
4724 }
4725
4726 if (allow_exec) {
4727 DWORD old_protect;
4728 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4729 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4730
4731 if (!res) {
4732 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4733 // Don't consider this a hard error, on IA32 even if the
4734 // VirtualProtect fails, we should still be able to execute
4735 CloseHandle(hFile);
4736 return base;
4737 }
4738 }
4739
4740 if (CloseHandle(hFile) == 0) {
4741 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4742 return base;
4743 }
4744
4745 return base;
4746 }
4747
4748
4749 // Remap a block of memory.
4750 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4751 char *addr, size_t bytes, bool read_only,
4752 bool allow_exec) {
4753 // This OS does not allow existing memory maps to be remapped so we
4754 // have to unmap the memory before we remap it.
4755 if (!os::unmap_memory(addr, bytes)) {
4756 return NULL;
4757 }
4758
4759 // There is a very small theoretical window between the unmap_memory()
4760 // call above and the map_memory() call below where a thread in native
4761 // code may be able to access an address that is no longer mapped.
4762
4763 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4764 read_only, allow_exec);
4765 }
4766
4767
4768 // Unmap a block of memory.
4769 // Returns true=success, otherwise false.
4770
4771 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4772 MEMORY_BASIC_INFORMATION mem_info;
4773 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4774 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4775 return false;
4776 }
4777
4778 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4779 // Instead, executable region was allocated using VirtualAlloc(). See
4780 // pd_map_memory() above.
4781 //
4782 // The following flags should match the 'exec_access' flages used for
4783 // VirtualProtect() in pd_map_memory().
4784 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4785 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4786 return pd_release_memory(addr, bytes);
4787 }
4788
4789 BOOL result = UnmapViewOfFile(addr);
4790 if (result == 0) {
4791 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4792 return false;
4793 }
4794 return true;
4795 }
4796
4797 void os::pause() {
4798 char filename[MAX_PATH];
4799 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4800 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4801 } else {
4802 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4803 }
4804
4805 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4806 if (fd != -1) {
4807 struct stat buf;
4808 ::close(fd);
4809 while (::stat(filename, &buf) == 0) {
4810 Sleep(100);
4811 }
4812 } else {
4813 jio_fprintf(stderr,
4814 "Could not open pause file '%s', continuing immediately.\n", filename);
4815 }
4816 }
4817
4818 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4819 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4820 }
4821
4822 // See the caveats for this class in os_windows.hpp
4823 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4824 // into this method and returns false. If no OS EXCEPTION was raised, returns
4825 // true.
4826 // The callback is supposed to provide the method that should be protected.
4827 //
4828 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4829 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4830 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4831 "crash_protection already set?");
4832
4833 bool success = true;
4834 __try {
4835 WatcherThread::watcher_thread()->set_crash_protection(this);
4836 cb.call();
4837 } __except(EXCEPTION_EXECUTE_HANDLER) {
4838 // only for protection, nothing to do
4839 success = false;
4840 }
4841 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4842 return success;
4843 }
4844
4845 // An Event wraps a win32 "CreateEvent" kernel handle.
4846 //
4847 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4848 //
4849 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4850 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4851 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4852 // In addition, an unpark() operation might fetch the handle field, but the
4853 // event could recycle between the fetch and the SetEvent() operation.
4854 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4855 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4856 // on an stale but recycled handle would be harmless, but in practice this might
4857 // confuse other non-Sun code, so it's not a viable approach.
4858 //
4859 // 2: Once a win32 event handle is associated with an Event, it remains associated
4860 // with the Event. The event handle is never closed. This could be construed
4861 // as handle leakage, but only up to the maximum # of threads that have been extant
4862 // at any one time. This shouldn't be an issue, as windows platforms typically
4863 // permit a process to have hundreds of thousands of open handles.
4864 //
4865 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4866 // and release unused handles.
4867 //
4868 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4869 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4870 //
4871 // 5. Use an RCU-like mechanism (Read-Copy Update).
4872 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4873 //
4874 // We use (2).
4875 //
4876 // TODO-FIXME:
4877 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4878 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4879 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4880 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4881 // into a single win32 CreateEvent() handle.
4882 //
4883 // Assumption:
4884 // Only one parker can exist on an event, which is why we allocate
4885 // them per-thread. Multiple unparkers can coexist.
4886 //
4887 // _Event transitions in park()
4888 // -1 => -1 : illegal
4889 // 1 => 0 : pass - return immediately
4890 // 0 => -1 : block; then set _Event to 0 before returning
4891 //
4892 // _Event transitions in unpark()
4893 // 0 => 1 : just return
4894 // 1 => 1 : just return
4895 // -1 => either 0 or 1; must signal target thread
4896 // That is, we can safely transition _Event from -1 to either
4897 // 0 or 1.
4898 //
4899 // _Event serves as a restricted-range semaphore.
4900 // -1 : thread is blocked, i.e. there is a waiter
4901 // 0 : neutral: thread is running or ready,
4902 // could have been signaled after a wait started
4903 // 1 : signaled - thread is running or ready
4904 //
4905 // Another possible encoding of _Event would be with
4906 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4907 //
4908
4909 int os::PlatformEvent::park(jlong Millis) {
4910 // Transitions for _Event:
4911 // -1 => -1 : illegal
4912 // 1 => 0 : pass - return immediately
4913 // 0 => -1 : block; then set _Event to 0 before returning
4914
4915 guarantee(_ParkHandle != NULL , "Invariant");
4916 guarantee(Millis > 0 , "Invariant");
4917
4918 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4919 // the initial park() operation.
4920 // Consider: use atomic decrement instead of CAS-loop
4921
4922 int v;
4923 for (;;) {
4924 v = _Event;
4925 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4926 }
4927 guarantee((v == 0) || (v == 1), "invariant");
4928 if (v != 0) return OS_OK;
4929
4930 // Do this the hard way by blocking ...
4931 // TODO: consider a brief spin here, gated on the success of recent
4932 // spin attempts by this thread.
4933 //
4934 // We decompose long timeouts into series of shorter timed waits.
4935 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4936 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4937 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4938 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4939 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4940 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4941 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4942 // for the already waited time. This policy does not admit any new outcomes.
4943 // In the future, however, we might want to track the accumulated wait time and
4944 // adjust Millis accordingly if we encounter a spurious wakeup.
4945
4946 const int MAXTIMEOUT = 0x10000000;
4947 DWORD rv = WAIT_TIMEOUT;
4948 while (_Event < 0 && Millis > 0) {
4949 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
4950 if (Millis > MAXTIMEOUT) {
4951 prd = MAXTIMEOUT;
4952 }
4953 rv = ::WaitForSingleObject(_ParkHandle, prd);
4954 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
4955 if (rv == WAIT_TIMEOUT) {
4956 Millis -= prd;
4957 }
4958 }
4959 v = _Event;
4960 _Event = 0;
4961 // see comment at end of os::PlatformEvent::park() below:
4962 OrderAccess::fence();
4963 // If we encounter a nearly simultanous timeout expiry and unpark()
4964 // we return OS_OK indicating we awoke via unpark().
4965 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4966 return (v >= 0) ? OS_OK : OS_TIMEOUT;
4967 }
4968
4969 void os::PlatformEvent::park() {
4970 // Transitions for _Event:
4971 // -1 => -1 : illegal
4972 // 1 => 0 : pass - return immediately
4973 // 0 => -1 : block; then set _Event to 0 before returning
4974
4975 guarantee(_ParkHandle != NULL, "Invariant");
4976 // Invariant: Only the thread associated with the Event/PlatformEvent
4977 // may call park().
4978 // Consider: use atomic decrement instead of CAS-loop
4979 int v;
4980 for (;;) {
4981 v = _Event;
4982 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4983 }
4984 guarantee((v == 0) || (v == 1), "invariant");
4985 if (v != 0) return;
4986
4987 // Do this the hard way by blocking ...
4988 // TODO: consider a brief spin here, gated on the success of recent
4989 // spin attempts by this thread.
4990 while (_Event < 0) {
4991 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
4992 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
4993 }
4994
4995 // Usually we'll find _Event == 0 at this point, but as
4996 // an optional optimization we clear it, just in case can
4997 // multiple unpark() operations drove _Event up to 1.
4998 _Event = 0;
4999 OrderAccess::fence();
5000 guarantee(_Event >= 0, "invariant");
5001 }
5002
5003 void os::PlatformEvent::unpark() {
5004 guarantee(_ParkHandle != NULL, "Invariant");
5005
5006 // Transitions for _Event:
5007 // 0 => 1 : just return
5008 // 1 => 1 : just return
5009 // -1 => either 0 or 1; must signal target thread
5010 // That is, we can safely transition _Event from -1 to either
5011 // 0 or 1.
5012 // See also: "Semaphores in Plan 9" by Mullender & Cox
5013 //
5014 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5015 // that it will take two back-to-back park() calls for the owning
5016 // thread to block. This has the benefit of forcing a spurious return
5017 // from the first park() call after an unpark() call which will help
5018 // shake out uses of park() and unpark() without condition variables.
5019
5020 if (Atomic::xchg(1, &_Event) >= 0) return;
5021
5022 ::SetEvent(_ParkHandle);
5023 }
5024
5025
5026 // JSR166
5027 // -------------------------------------------------------
5028
5029 // The Windows implementation of Park is very straightforward: Basic
5030 // operations on Win32 Events turn out to have the right semantics to
5031 // use them directly. We opportunistically resuse the event inherited
5032 // from Monitor.
5033
5034 void Parker::park(bool isAbsolute, jlong time) {
5035 guarantee(_ParkEvent != NULL, "invariant");
5036 // First, demultiplex/decode time arguments
5037 if (time < 0) { // don't wait
5038 return;
5039 } else if (time == 0 && !isAbsolute) {
5040 time = INFINITE;
5041 } else if (isAbsolute) {
5042 time -= os::javaTimeMillis(); // convert to relative time
5043 if (time <= 0) { // already elapsed
5044 return;
5045 }
5046 } else { // relative
5047 time /= 1000000; // Must coarsen from nanos to millis
5048 if (time == 0) { // Wait for the minimal time unit if zero
5049 time = 1;
5050 }
5051 }
5052
5053 JavaThread* thread = JavaThread::current();
5054
5055 // Don't wait if interrupted or already triggered
5056 if (Thread::is_interrupted(thread, false) ||
5057 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5058 ResetEvent(_ParkEvent);
5059 return;
5060 } else {
5061 ThreadBlockInVM tbivm(thread);
5062 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5063 thread->set_suspend_equivalent();
5064
5065 WaitForSingleObject(_ParkEvent, time);
5066 ResetEvent(_ParkEvent);
5067
5068 // If externally suspended while waiting, re-suspend
5069 if (thread->handle_special_suspend_equivalent_condition()) {
5070 thread->java_suspend_self();
5071 }
5072 }
5073 }
5074
5075 void Parker::unpark() {
5076 guarantee(_ParkEvent != NULL, "invariant");
5077 SetEvent(_ParkEvent);
5078 }
5079
5080 // Run the specified command in a separate process. Return its exit value,
5081 // or -1 on failure (e.g. can't create a new process).
5082 int os::fork_and_exec(char* cmd) {
5083 STARTUPINFO si;
5084 PROCESS_INFORMATION pi;
5085 DWORD exit_code;
5086
5087 char * cmd_string;
5088 char * cmd_prefix = "cmd /C ";
5089 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5090 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5091 if (cmd_string == NULL) {
5092 return -1;
5093 }
5094 cmd_string[0] = '\0';
5095 strcat(cmd_string, cmd_prefix);
5096 strcat(cmd_string, cmd);
5097
5098 // now replace all '\n' with '&'
5099 char * substring = cmd_string;
5100 while ((substring = strchr(substring, '\n')) != NULL) {
5101 substring[0] = '&';
5102 substring++;
5103 }
5104 memset(&si, 0, sizeof(si));
5105 si.cb = sizeof(si);
5106 memset(&pi, 0, sizeof(pi));
5107 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5108 cmd_string, // command line
5109 NULL, // process security attribute
5110 NULL, // thread security attribute
5111 TRUE, // inherits system handles
5112 0, // no creation flags
5113 NULL, // use parent's environment block
5114 NULL, // use parent's starting directory
5115 &si, // (in) startup information
5116 &pi); // (out) process information
5117
5118 if (rslt) {
5119 // Wait until child process exits.
5120 WaitForSingleObject(pi.hProcess, INFINITE);
5121
5122 GetExitCodeProcess(pi.hProcess, &exit_code);
5123
5124 // Close process and thread handles.
5125 CloseHandle(pi.hProcess);
5126 CloseHandle(pi.hThread);
5127 } else {
5128 exit_code = -1;
5129 }
5130
5131 FREE_C_HEAP_ARRAY(char, cmd_string);
5132 return (int)exit_code;
5133 }
5134
5135 bool os::find(address addr, outputStream* st) {
5136 int offset = -1;
5137 bool result = false;
5138 char buf[256];
5139 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5140 st->print(PTR_FORMAT " ", addr);
5141 if (strlen(buf) < sizeof(buf) - 1) {
5142 char* p = strrchr(buf, '\\');
5143 if (p) {
5144 st->print("%s", p + 1);
5145 } else {
5146 st->print("%s", buf);
5147 }
5148 } else {
5149 // The library name is probably truncated. Let's omit the library name.
5150 // See also JDK-8147512.
5151 }
5152 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5153 st->print("::%s + 0x%x", buf, offset);
5154 }
5155 st->cr();
5156 result = true;
5157 }
5158 return result;
5159 }
5160
5161 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5162 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5163
5164 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5165 JavaThread* thread = JavaThread::current();
5166 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5167 address addr = (address) exceptionRecord->ExceptionInformation[1];
5168
5169 if (os::is_memory_serialize_page(thread, addr)) {
5170 return EXCEPTION_CONTINUE_EXECUTION;
5171 }
5172 }
5173
5174 return EXCEPTION_CONTINUE_SEARCH;
5175 }
5176
5177 // We don't build a headless jre for Windows
5178 bool os::is_headless_jre() { return false; }
5179
5180 static jint initSock() {
5181 WSADATA wsadata;
5182
5183 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5184 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5185 ::GetLastError());
5186 return JNI_ERR;
5187 }
5188 return JNI_OK;
5189 }
5190
5191 struct hostent* os::get_host_by_name(char* name) {
5192 return (struct hostent*)gethostbyname(name);
5193 }
5194
5195 int os::socket_close(int fd) {
5196 return ::closesocket(fd);
5197 }
5198
5199 int os::socket(int domain, int type, int protocol) {
5200 return ::socket(domain, type, protocol);
5201 }
5202
5203 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5204 return ::connect(fd, him, len);
5205 }
5206
5207 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5208 return ::recv(fd, buf, (int)nBytes, flags);
5209 }
5210
5211 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5212 return ::send(fd, buf, (int)nBytes, flags);
5213 }
5214
5215 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5216 return ::send(fd, buf, (int)nBytes, flags);
5217 }
5218
5219 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5220 #if defined(IA32)
5221 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5222 #elif defined (AMD64)
5223 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5224 #endif
5225
5226 // returns true if thread could be suspended,
5227 // false otherwise
5228 static bool do_suspend(HANDLE* h) {
5229 if (h != NULL) {
5230 if (SuspendThread(*h) != ~0) {
5231 return true;
5232 }
5233 }
5234 return false;
5235 }
5236
5237 // resume the thread
5238 // calling resume on an active thread is a no-op
5239 static void do_resume(HANDLE* h) {
5240 if (h != NULL) {
5241 ResumeThread(*h);
5242 }
5243 }
5244
5245 // retrieve a suspend/resume context capable handle
5246 // from the tid. Caller validates handle return value.
5247 void get_thread_handle_for_extended_context(HANDLE* h,
5248 OSThread::thread_id_t tid) {
5249 if (h != NULL) {
5250 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5251 }
5252 }
5253
5254 // Thread sampling implementation
5255 //
5256 void os::SuspendedThreadTask::internal_do_task() {
5257 CONTEXT ctxt;
5258 HANDLE h = NULL;
5259
5260 // get context capable handle for thread
5261 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5262
5263 // sanity
5264 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5265 return;
5266 }
5267
5268 // suspend the thread
5269 if (do_suspend(&h)) {
5270 ctxt.ContextFlags = sampling_context_flags;
5271 // get thread context
5272 GetThreadContext(h, &ctxt);
5273 SuspendedThreadTaskContext context(_thread, &ctxt);
5274 // pass context to Thread Sampling impl
5275 do_task(context);
5276 // resume thread
5277 do_resume(&h);
5278 }
5279
5280 // close handle
5281 CloseHandle(h);
5282 }
5283
5284 bool os::start_debugging(char *buf, int buflen) {
5285 int len = (int)strlen(buf);
5286 char *p = &buf[len];
5287
5288 jio_snprintf(p, buflen-len,
5289 "\n\n"
5290 "Do you want to debug the problem?\n\n"
5291 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5292 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5293 "Otherwise, select 'No' to abort...",
5294 os::current_process_id(), os::current_thread_id());
5295
5296 bool yes = os::message_box("Unexpected Error", buf);
5297
5298 if (yes) {
5299 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5300 // exception. If VM is running inside a debugger, the debugger will
5301 // catch the exception. Otherwise, the breakpoint exception will reach
5302 // the default windows exception handler, which can spawn a debugger and
5303 // automatically attach to the dying VM.
5304 os::breakpoint();
5305 yes = false;
5306 }
5307 return yes;
5308 }
5309
5310 void* os::get_default_process_handle() {
5311 return (void*)GetModuleHandle(NULL);
5312 }
5313
5314 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5315 // which is used to find statically linked in agents.
5316 // Additionally for windows, takes into account __stdcall names.
5317 // Parameters:
5318 // sym_name: Symbol in library we are looking for
5319 // lib_name: Name of library to look in, NULL for shared libs.
5320 // is_absolute_path == true if lib_name is absolute path to agent
5321 // such as "C:/a/b/L.dll"
5322 // == false if only the base name of the library is passed in
5323 // such as "L"
5324 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5325 bool is_absolute_path) {
5326 char *agent_entry_name;
5327 size_t len;
5328 size_t name_len;
5329 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5330 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5331 const char *start;
5332
5333 if (lib_name != NULL) {
5334 len = name_len = strlen(lib_name);
5335 if (is_absolute_path) {
5336 // Need to strip path, prefix and suffix
5337 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5338 lib_name = ++start;
5339 } else {
5340 // Need to check for drive prefix
5341 if ((start = strchr(lib_name, ':')) != NULL) {
5342 lib_name = ++start;
5343 }
5344 }
5345 if (len <= (prefix_len + suffix_len)) {
5346 return NULL;
5347 }
5348 lib_name += prefix_len;
5349 name_len = strlen(lib_name) - suffix_len;
5350 }
5351 }
5352 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5353 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5354 if (agent_entry_name == NULL) {
5355 return NULL;
5356 }
5357 if (lib_name != NULL) {
5358 const char *p = strrchr(sym_name, '@');
5359 if (p != NULL && p != sym_name) {
5360 // sym_name == _Agent_OnLoad@XX
5361 strncpy(agent_entry_name, sym_name, (p - sym_name));
5362 agent_entry_name[(p-sym_name)] = '\0';
5363 // agent_entry_name == _Agent_OnLoad
5364 strcat(agent_entry_name, "_");
5365 strncat(agent_entry_name, lib_name, name_len);
5366 strcat(agent_entry_name, p);
5367 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5368 } else {
5369 strcpy(agent_entry_name, sym_name);
5370 strcat(agent_entry_name, "_");
5371 strncat(agent_entry_name, lib_name, name_len);
5372 }
5373 } else {
5374 strcpy(agent_entry_name, sym_name);
5375 }
5376 return agent_entry_name;
5377 }
5378
5379 #ifndef PRODUCT
5380
5381 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5382 // contiguous memory block at a particular address.
5383 // The test first tries to find a good approximate address to allocate at by using the same
5384 // method to allocate some memory at any address. The test then tries to allocate memory in
5385 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5386 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5387 // the previously allocated memory is available for allocation. The only actual failure
5388 // that is reported is when the test tries to allocate at a particular location but gets a
5389 // different valid one. A NULL return value at this point is not considered an error but may
5390 // be legitimate.
5391 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5392 void TestReserveMemorySpecial_test() {
5393 if (!UseLargePages) {
5394 if (VerboseInternalVMTests) {
5395 tty->print("Skipping test because large pages are disabled");
5396 }
5397 return;
5398 }
5399 // save current value of globals
5400 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5401 bool old_use_numa_interleaving = UseNUMAInterleaving;
5402
5403 // set globals to make sure we hit the correct code path
5404 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5405
5406 // do an allocation at an address selected by the OS to get a good one.
5407 const size_t large_allocation_size = os::large_page_size() * 4;
5408 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5409 if (result == NULL) {
5410 if (VerboseInternalVMTests) {
5411 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5412 large_allocation_size);
5413 }
5414 } else {
5415 os::release_memory_special(result, large_allocation_size);
5416
5417 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5418 // we managed to get it once.
5419 const size_t expected_allocation_size = os::large_page_size();
5420 char* expected_location = result + os::large_page_size();
5421 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5422 if (actual_location == NULL) {
5423 if (VerboseInternalVMTests) {
5424 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5425 expected_location, large_allocation_size);
5426 }
5427 } else {
5428 // release memory
5429 os::release_memory_special(actual_location, expected_allocation_size);
5430 // only now check, after releasing any memory to avoid any leaks.
5431 assert(actual_location == expected_location,
5432 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5433 expected_location, expected_allocation_size, actual_location);
5434 }
5435 }
5436
5437 // restore globals
5438 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5439 UseNUMAInterleaving = old_use_numa_interleaving;
5440 }
5441 #endif // PRODUCT
5442
5443 /*
5444 All the defined signal names for Windows.
5445
5446 NOTE that not all of these names are accepted by FindSignal!
5447
5448 For various reasons some of these may be rejected at runtime.
5449
5450 Here are the names currently accepted by a user of sun.misc.Signal with
5451 1.4.1 (ignoring potential interaction with use of chaining, etc):
5452
5453 (LIST TBD)
5454
5455 */
5456 int os::get_signal_number(const char* name) {
5457 static const struct {
5458 char* name;
5459 int number;
5460 } siglabels [] =
5461 // derived from version 6.0 VC98/include/signal.h
5462 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5463 "FPE", SIGFPE, // floating point exception
5464 "SEGV", SIGSEGV, // segment violation
5465 "INT", SIGINT, // interrupt
5466 "TERM", SIGTERM, // software term signal from kill
5467 "BREAK", SIGBREAK, // Ctrl-Break sequence
5468 "ILL", SIGILL}; // illegal instruction
5469 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5470 if (strcmp(name, siglabels[i].name) == 0) {
5471 return siglabels[i].number;
5472 }
5473 }
5474 return -1;
5475 }
5476
5477 // Fast current thread access
5478
5479 int os::win32::_thread_ptr_offset = 0;
5480
5481 static void call_wrapper_dummy() {}
5482
5483 // We need to call the os_exception_wrapper once so that it sets
5484 // up the offset from FS of the thread pointer.
5485 void os::win32::initialize_thread_ptr_offset() {
5486 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5487 NULL, NULL, NULL, NULL);
5488 }