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 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1466 };
1467 #if (defined _M_AMD64)
1468 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1469 #elif (defined _M_IX86)
1470 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1471 #else
1472 #error Method os::dll_load requires that one of following \
1473 is defined :_M_AMD64 or _M_IX86
1474 #endif
1475
1476
1477 // Obtain a string for printf operation
1478 // lib_arch_str shall contain string what platform this .dll was built for
1479 // running_arch_str shall string contain what platform Hotspot was built for
1480 char *running_arch_str = NULL, *lib_arch_str = NULL;
1481 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1482 if (lib_arch == arch_array[i].arch_code) {
1483 lib_arch_str = arch_array[i].arch_name;
1484 }
1485 if (running_arch == arch_array[i].arch_code) {
1486 running_arch_str = arch_array[i].arch_name;
1487 }
1488 }
1489
1490 assert(running_arch_str,
1491 "Didn't find running architecture code in arch_array");
1492
1493 // If the architecture is right
1494 // but some other error took place - report os::lasterror(...) msg
1495 if (lib_arch == running_arch) {
1496 return NULL;
1497 }
1498
1499 if (lib_arch_str != NULL) {
1500 ::_snprintf(ebuf, ebuflen - 1,
1501 "Can't load %s-bit .dll on a %s-bit platform",
1502 lib_arch_str, running_arch_str);
1503 } else {
1504 // don't know what architecture this dll was build for
1505 ::_snprintf(ebuf, ebuflen - 1,
1506 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1507 lib_arch, running_arch_str);
1508 }
1509
1510 return NULL;
1511 }
1512
1513 void os::print_dll_info(outputStream *st) {
1514 st->print_cr("Dynamic libraries:");
1515 get_loaded_modules_info(_print_module, (void *)st);
1516 }
1517
1518 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1519 HANDLE hProcess;
1520
1521 # define MAX_NUM_MODULES 128
1522 HMODULE modules[MAX_NUM_MODULES];
1523 static char filename[MAX_PATH];
1524 int result = 0;
1525
1526 int pid = os::current_process_id();
1527 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1528 FALSE, pid);
1529 if (hProcess == NULL) return 0;
1530
1531 DWORD size_needed;
1532 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1533 CloseHandle(hProcess);
1534 return 0;
1535 }
1536
1537 // number of modules that are currently loaded
1538 int num_modules = size_needed / sizeof(HMODULE);
1539
1540 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1541 // Get Full pathname:
1542 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1543 filename[0] = '\0';
1544 }
1545
1546 MODULEINFO modinfo;
1547 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1548 modinfo.lpBaseOfDll = NULL;
1549 modinfo.SizeOfImage = 0;
1550 }
1551
1552 // Invoke callback function
1553 result = callback(filename, (address)modinfo.lpBaseOfDll,
1554 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1555 if (result) break;
1556 }
1557
1558 CloseHandle(hProcess);
1559 return result;
1560 }
1561
1562 bool os::get_host_name(char* buf, size_t buflen) {
1563 DWORD size = (DWORD)buflen;
1564 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1565 }
1566
1567 void os::get_summary_os_info(char* buf, size_t buflen) {
1568 stringStream sst(buf, buflen);
1569 os::win32::print_windows_version(&sst);
1570 // chop off newline character
1571 char* nl = strchr(buf, '\n');
1572 if (nl != NULL) *nl = '\0';
1573 }
1574
1575 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1576 int ret = vsnprintf(buf, len, fmt, args);
1577 // Get the correct buffer size if buf is too small
1578 if (ret < 0) {
1579 return _vscprintf(fmt, args);
1580 }
1581 return ret;
1582 }
1583
1584 static inline time_t get_mtime(const char* filename) {
1585 struct stat st;
1586 int ret = os::stat(filename, &st);
1587 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1588 return st.st_mtime;
1589 }
1590
1591 int os::compare_file_modified_times(const char* file1, const char* file2) {
1592 time_t t1 = get_mtime(file1);
1593 time_t t2 = get_mtime(file2);
1594 return t1 - t2;
1595 }
1596
1597 void os::print_os_info_brief(outputStream* st) {
1598 os::print_os_info(st);
1599 }
1600
1601 void os::print_os_info(outputStream* st) {
1602 #ifdef ASSERT
1603 char buffer[1024];
1604 st->print("HostName: ");
1605 if (get_host_name(buffer, sizeof(buffer))) {
1606 st->print("%s ", buffer);
1607 } else {
1608 st->print("N/A ");
1609 }
1610 #endif
1611 st->print("OS:");
1612 os::win32::print_windows_version(st);
1613 }
1614
1615 void os::win32::print_windows_version(outputStream* st) {
1616 OSVERSIONINFOEX osvi;
1617 VS_FIXEDFILEINFO *file_info;
1618 TCHAR kernel32_path[MAX_PATH];
1619 UINT len, ret;
1620
1621 // Use the GetVersionEx information to see if we're on a server or
1622 // workstation edition of Windows. Starting with Windows 8.1 we can't
1623 // trust the OS version information returned by this API.
1624 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1625 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1626 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1627 st->print_cr("Call to GetVersionEx failed");
1628 return;
1629 }
1630 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1631
1632 // Get the full path to \Windows\System32\kernel32.dll and use that for
1633 // determining what version of Windows we're running on.
1634 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1635 ret = GetSystemDirectory(kernel32_path, len);
1636 if (ret == 0 || ret > len) {
1637 st->print_cr("Call to GetSystemDirectory failed");
1638 return;
1639 }
1640 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1641
1642 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1643 if (version_size == 0) {
1644 st->print_cr("Call to GetFileVersionInfoSize failed");
1645 return;
1646 }
1647
1648 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1649 if (version_info == NULL) {
1650 st->print_cr("Failed to allocate version_info");
1651 return;
1652 }
1653
1654 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1655 os::free(version_info);
1656 st->print_cr("Call to GetFileVersionInfo failed");
1657 return;
1658 }
1659
1660 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1661 os::free(version_info);
1662 st->print_cr("Call to VerQueryValue failed");
1663 return;
1664 }
1665
1666 int major_version = HIWORD(file_info->dwProductVersionMS);
1667 int minor_version = LOWORD(file_info->dwProductVersionMS);
1668 int build_number = HIWORD(file_info->dwProductVersionLS);
1669 int build_minor = LOWORD(file_info->dwProductVersionLS);
1670 int os_vers = major_version * 1000 + minor_version;
1671 os::free(version_info);
1672
1673 st->print(" Windows ");
1674 switch (os_vers) {
1675
1676 case 6000:
1677 if (is_workstation) {
1678 st->print("Vista");
1679 } else {
1680 st->print("Server 2008");
1681 }
1682 break;
1683
1684 case 6001:
1685 if (is_workstation) {
1686 st->print("7");
1687 } else {
1688 st->print("Server 2008 R2");
1689 }
1690 break;
1691
1692 case 6002:
1693 if (is_workstation) {
1694 st->print("8");
1695 } else {
1696 st->print("Server 2012");
1697 }
1698 break;
1699
1700 case 6003:
1701 if (is_workstation) {
1702 st->print("8.1");
1703 } else {
1704 st->print("Server 2012 R2");
1705 }
1706 break;
1707
1708 case 10000:
1709 if (is_workstation) {
1710 st->print("10");
1711 } else {
1712 st->print("Server 2016");
1713 }
1714 break;
1715
1716 default:
1717 // Unrecognized windows, print out its major and minor versions
1718 st->print("%d.%d", major_version, minor_version);
1719 break;
1720 }
1721
1722 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1723 // find out whether we are running on 64 bit processor or not
1724 SYSTEM_INFO si;
1725 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1726 GetNativeSystemInfo(&si);
1727 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1728 st->print(" , 64 bit");
1729 }
1730
1731 st->print(" Build %d", build_number);
1732 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1733 st->cr();
1734 }
1735
1736 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1737 // Nothing to do for now.
1738 }
1739
1740 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1741 HKEY key;
1742 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1743 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1744 if (status == ERROR_SUCCESS) {
1745 DWORD size = (DWORD)buflen;
1746 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1747 if (status != ERROR_SUCCESS) {
1748 strncpy(buf, "## __CPU__", buflen);
1749 }
1750 RegCloseKey(key);
1751 } else {
1752 // Put generic cpu info to return
1753 strncpy(buf, "## __CPU__", buflen);
1754 }
1755 }
1756
1757 void os::print_memory_info(outputStream* st) {
1758 st->print("Memory:");
1759 st->print(" %dk page", os::vm_page_size()>>10);
1760
1761 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1762 // value if total memory is larger than 4GB
1763 MEMORYSTATUSEX ms;
1764 ms.dwLength = sizeof(ms);
1765 GlobalMemoryStatusEx(&ms);
1766
1767 st->print(", physical %uk", os::physical_memory() >> 10);
1768 st->print("(%uk free)", os::available_memory() >> 10);
1769
1770 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1771 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1772 st->cr();
1773 }
1774
1775 void os::print_siginfo(outputStream *st, const void* siginfo) {
1776 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1777 st->print("siginfo:");
1778
1779 char tmp[64];
1780 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1781 strcpy(tmp, "EXCEPTION_??");
1782 }
1783 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1784
1785 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1786 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1787 er->NumberParameters >= 2) {
1788 switch (er->ExceptionInformation[0]) {
1789 case 0: st->print(", reading address"); break;
1790 case 1: st->print(", writing address"); break;
1791 case 8: st->print(", data execution prevention violation at address"); break;
1792 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1793 er->ExceptionInformation[0]);
1794 }
1795 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1796 } else {
1797 int num = er->NumberParameters;
1798 if (num > 0) {
1799 st->print(", ExceptionInformation=");
1800 for (int i = 0; i < num; i++) {
1801 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1802 }
1803 }
1804 }
1805 st->cr();
1806 }
1807
1808 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1809 // do nothing
1810 }
1811
1812 static char saved_jvm_path[MAX_PATH] = {0};
1813
1814 // Find the full path to the current module, jvm.dll
1815 void os::jvm_path(char *buf, jint buflen) {
1816 // Error checking.
1817 if (buflen < MAX_PATH) {
1818 assert(false, "must use a large-enough buffer");
1819 buf[0] = '\0';
1820 return;
1821 }
1822 // Lazy resolve the path to current module.
1823 if (saved_jvm_path[0] != 0) {
1824 strcpy(buf, saved_jvm_path);
1825 return;
1826 }
1827
1828 buf[0] = '\0';
1829 if (Arguments::sun_java_launcher_is_altjvm()) {
1830 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1831 // for a JAVA_HOME environment variable and fix up the path so it
1832 // looks like jvm.dll is installed there (append a fake suffix
1833 // hotspot/jvm.dll).
1834 char* java_home_var = ::getenv("JAVA_HOME");
1835 if (java_home_var != NULL && java_home_var[0] != 0 &&
1836 strlen(java_home_var) < (size_t)buflen) {
1837 strncpy(buf, java_home_var, buflen);
1838
1839 // determine if this is a legacy image or modules image
1840 // modules image doesn't have "jre" subdirectory
1841 size_t len = strlen(buf);
1842 char* jrebin_p = buf + len;
1843 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1844 if (0 != _access(buf, 0)) {
1845 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1846 }
1847 len = strlen(buf);
1848 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1849 }
1850 }
1851
1852 if (buf[0] == '\0') {
1853 GetModuleFileName(vm_lib_handle, buf, buflen);
1854 }
1855 strncpy(saved_jvm_path, buf, MAX_PATH);
1856 saved_jvm_path[MAX_PATH - 1] = '\0';
1857 }
1858
1859
1860 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1861 #ifndef _WIN64
1862 st->print("_");
1863 #endif
1864 }
1865
1866
1867 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1868 #ifndef _WIN64
1869 st->print("@%d", args_size * sizeof(int));
1870 #endif
1871 }
1872
1873 // This method is a copy of JDK's sysGetLastErrorString
1874 // from src/windows/hpi/src/system_md.c
1875
1876 size_t os::lasterror(char* buf, size_t len) {
1877 DWORD errval;
1878
1879 if ((errval = GetLastError()) != 0) {
1880 // DOS error
1881 size_t n = (size_t)FormatMessage(
1882 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1883 NULL,
1884 errval,
1885 0,
1886 buf,
1887 (DWORD)len,
1888 NULL);
1889 if (n > 3) {
1890 // Drop final '.', CR, LF
1891 if (buf[n - 1] == '\n') n--;
1892 if (buf[n - 1] == '\r') n--;
1893 if (buf[n - 1] == '.') n--;
1894 buf[n] = '\0';
1895 }
1896 return n;
1897 }
1898
1899 if (errno != 0) {
1900 // C runtime error that has no corresponding DOS error code
1901 const char* s = os::strerror(errno);
1902 size_t n = strlen(s);
1903 if (n >= len) n = len - 1;
1904 strncpy(buf, s, n);
1905 buf[n] = '\0';
1906 return n;
1907 }
1908
1909 return 0;
1910 }
1911
1912 int os::get_last_error() {
1913 DWORD error = GetLastError();
1914 if (error == 0) {
1915 error = errno;
1916 }
1917 return (int)error;
1918 }
1919
1920 WindowsSemaphore::WindowsSemaphore(uint value) {
1921 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1922
1923 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1924 }
1925
1926 WindowsSemaphore::~WindowsSemaphore() {
1927 ::CloseHandle(_semaphore);
1928 }
1929
1930 void WindowsSemaphore::signal(uint count) {
1931 if (count > 0) {
1932 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1933
1934 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1935 }
1936 }
1937
1938 void WindowsSemaphore::wait() {
1939 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1940 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1941 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1942 }
1943
1944 // sun.misc.Signal
1945 // NOTE that this is a workaround for an apparent kernel bug where if
1946 // a signal handler for SIGBREAK is installed then that signal handler
1947 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1948 // See bug 4416763.
1949 static void (*sigbreakHandler)(int) = NULL;
1950
1951 static void UserHandler(int sig, void *siginfo, void *context) {
1952 os::signal_notify(sig);
1953 // We need to reinstate the signal handler each time...
1954 os::signal(sig, (void*)UserHandler);
1955 }
1956
1957 void* os::user_handler() {
1958 return (void*) UserHandler;
1959 }
1960
1961 void* os::signal(int signal_number, void* handler) {
1962 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1963 void (*oldHandler)(int) = sigbreakHandler;
1964 sigbreakHandler = (void (*)(int)) handler;
1965 return (void*) oldHandler;
1966 } else {
1967 return (void*)::signal(signal_number, (void (*)(int))handler);
1968 }
1969 }
1970
1971 void os::signal_raise(int signal_number) {
1972 raise(signal_number);
1973 }
1974
1975 // The Win32 C runtime library maps all console control events other than ^C
1976 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1977 // logoff, and shutdown events. We therefore install our own console handler
1978 // that raises SIGTERM for the latter cases.
1979 //
1980 static BOOL WINAPI consoleHandler(DWORD event) {
1981 switch (event) {
1982 case CTRL_C_EVENT:
1983 if (is_error_reported()) {
1984 // Ctrl-C is pressed during error reporting, likely because the error
1985 // handler fails to abort. Let VM die immediately.
1986 os::die();
1987 }
1988
1989 os::signal_raise(SIGINT);
1990 return TRUE;
1991 break;
1992 case CTRL_BREAK_EVENT:
1993 if (sigbreakHandler != NULL) {
1994 (*sigbreakHandler)(SIGBREAK);
1995 }
1996 return TRUE;
1997 break;
1998 case CTRL_LOGOFF_EVENT: {
1999 // Don't terminate JVM if it is running in a non-interactive session,
2000 // such as a service process.
2001 USEROBJECTFLAGS flags;
2002 HANDLE handle = GetProcessWindowStation();
2003 if (handle != NULL &&
2004 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2005 sizeof(USEROBJECTFLAGS), NULL)) {
2006 // If it is a non-interactive session, let next handler to deal
2007 // with it.
2008 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2009 return FALSE;
2010 }
2011 }
2012 }
2013 case CTRL_CLOSE_EVENT:
2014 case CTRL_SHUTDOWN_EVENT:
2015 os::signal_raise(SIGTERM);
2016 return TRUE;
2017 break;
2018 default:
2019 break;
2020 }
2021 return FALSE;
2022 }
2023
2024 // The following code is moved from os.cpp for making this
2025 // code platform specific, which it is by its very nature.
2026
2027 // Return maximum OS signal used + 1 for internal use only
2028 // Used as exit signal for signal_thread
2029 int os::sigexitnum_pd() {
2030 return NSIG;
2031 }
2032
2033 // a counter for each possible signal value, including signal_thread exit signal
2034 static volatile jint pending_signals[NSIG+1] = { 0 };
2035 static HANDLE sig_sem = NULL;
2036
2037 void os::signal_init_pd() {
2038 // Initialize signal structures
2039 memset((void*)pending_signals, 0, sizeof(pending_signals));
2040
2041 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2042
2043 // Programs embedding the VM do not want it to attempt to receive
2044 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2045 // shutdown hooks mechanism introduced in 1.3. For example, when
2046 // the VM is run as part of a Windows NT service (i.e., a servlet
2047 // engine in a web server), the correct behavior is for any console
2048 // control handler to return FALSE, not TRUE, because the OS's
2049 // "final" handler for such events allows the process to continue if
2050 // it is a service (while terminating it if it is not a service).
2051 // To make this behavior uniform and the mechanism simpler, we
2052 // completely disable the VM's usage of these console events if -Xrs
2053 // (=ReduceSignalUsage) is specified. This means, for example, that
2054 // the CTRL-BREAK thread dump mechanism is also disabled in this
2055 // case. See bugs 4323062, 4345157, and related bugs.
2056
2057 if (!ReduceSignalUsage) {
2058 // Add a CTRL-C handler
2059 SetConsoleCtrlHandler(consoleHandler, TRUE);
2060 }
2061 }
2062
2063 void os::signal_notify(int signal_number) {
2064 BOOL ret;
2065 if (sig_sem != NULL) {
2066 Atomic::inc(&pending_signals[signal_number]);
2067 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2068 assert(ret != 0, "ReleaseSemaphore() failed");
2069 }
2070 }
2071
2072 static int check_pending_signals(bool wait_for_signal) {
2073 DWORD ret;
2074 while (true) {
2075 for (int i = 0; i < NSIG + 1; i++) {
2076 jint n = pending_signals[i];
2077 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2078 return i;
2079 }
2080 }
2081 if (!wait_for_signal) {
2082 return -1;
2083 }
2084
2085 JavaThread *thread = JavaThread::current();
2086
2087 ThreadBlockInVM tbivm(thread);
2088
2089 bool threadIsSuspended;
2090 do {
2091 thread->set_suspend_equivalent();
2092 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2093 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2094 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2095
2096 // were we externally suspended while we were waiting?
2097 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2098 if (threadIsSuspended) {
2099 // The semaphore has been incremented, but while we were waiting
2100 // another thread suspended us. We don't want to continue running
2101 // while suspended because that would surprise the thread that
2102 // suspended us.
2103 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2104 assert(ret != 0, "ReleaseSemaphore() failed");
2105
2106 thread->java_suspend_self();
2107 }
2108 } while (threadIsSuspended);
2109 }
2110 }
2111
2112 int os::signal_lookup() {
2113 return check_pending_signals(false);
2114 }
2115
2116 int os::signal_wait() {
2117 return check_pending_signals(true);
2118 }
2119
2120 // Implicit OS exception handling
2121
2122 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2123 address handler) {
2124 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2125 // Save pc in thread
2126 #ifdef _M_AMD64
2127 // Do not blow up if no thread info available.
2128 if (thread) {
2129 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2130 }
2131 // Set pc to handler
2132 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2133 #else
2134 // Do not blow up if no thread info available.
2135 if (thread) {
2136 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2137 }
2138 // Set pc to handler
2139 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2140 #endif
2141
2142 // Continue the execution
2143 return EXCEPTION_CONTINUE_EXECUTION;
2144 }
2145
2146
2147 // Used for PostMortemDump
2148 extern "C" void safepoints();
2149 extern "C" void find(int x);
2150 extern "C" void events();
2151
2152 // According to Windows API documentation, an illegal instruction sequence should generate
2153 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2154 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2155 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2156
2157 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2158
2159 // From "Execution Protection in the Windows Operating System" draft 0.35
2160 // Once a system header becomes available, the "real" define should be
2161 // included or copied here.
2162 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2163
2164 // Windows Vista/2008 heap corruption check
2165 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2166
2167 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2168 // C++ compiler contain this error code. Because this is a compiler-generated
2169 // error, the code is not listed in the Win32 API header files.
2170 // The code is actually a cryptic mnemonic device, with the initial "E"
2171 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2172 // ASCII values of "msc".
2173
2174 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2175
2176 #define def_excpt(val) { #val, (val) }
2177
2178 static const struct { char* name; uint number; } exceptlabels[] = {
2179 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2180 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2181 def_excpt(EXCEPTION_BREAKPOINT),
2182 def_excpt(EXCEPTION_SINGLE_STEP),
2183 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2184 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2185 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2186 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2187 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2188 def_excpt(EXCEPTION_FLT_OVERFLOW),
2189 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2190 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2191 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2192 def_excpt(EXCEPTION_INT_OVERFLOW),
2193 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2194 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2195 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2196 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2197 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2198 def_excpt(EXCEPTION_STACK_OVERFLOW),
2199 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2200 def_excpt(EXCEPTION_GUARD_PAGE),
2201 def_excpt(EXCEPTION_INVALID_HANDLE),
2202 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2203 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2204 };
2205
2206 #undef def_excpt
2207
2208 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2209 uint code = static_cast<uint>(exception_code);
2210 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2211 if (exceptlabels[i].number == code) {
2212 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2213 return buf;
2214 }
2215 }
2216
2217 return NULL;
2218 }
2219
2220 //-----------------------------------------------------------------------------
2221 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2222 // handle exception caused by idiv; should only happen for -MinInt/-1
2223 // (division by zero is handled explicitly)
2224 #ifdef _M_AMD64
2225 PCONTEXT ctx = exceptionInfo->ContextRecord;
2226 address pc = (address)ctx->Rip;
2227 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2228 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2229 if (pc[0] == 0xF7) {
2230 // set correct result values and continue after idiv instruction
2231 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2232 } else {
2233 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2234 }
2235 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2236 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2237 // idiv opcode (0xF7).
2238 ctx->Rdx = (DWORD)0; // remainder
2239 // Continue the execution
2240 #else
2241 PCONTEXT ctx = exceptionInfo->ContextRecord;
2242 address pc = (address)ctx->Eip;
2243 assert(pc[0] == 0xF7, "not an idiv opcode");
2244 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2245 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2246 // set correct result values and continue after idiv instruction
2247 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2248 ctx->Eax = (DWORD)min_jint; // result
2249 ctx->Edx = (DWORD)0; // remainder
2250 // Continue the execution
2251 #endif
2252 return EXCEPTION_CONTINUE_EXECUTION;
2253 }
2254
2255 //-----------------------------------------------------------------------------
2256 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2257 PCONTEXT ctx = exceptionInfo->ContextRecord;
2258 #ifndef _WIN64
2259 // handle exception caused by native method modifying control word
2260 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2261
2262 switch (exception_code) {
2263 case EXCEPTION_FLT_DENORMAL_OPERAND:
2264 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2265 case EXCEPTION_FLT_INEXACT_RESULT:
2266 case EXCEPTION_FLT_INVALID_OPERATION:
2267 case EXCEPTION_FLT_OVERFLOW:
2268 case EXCEPTION_FLT_STACK_CHECK:
2269 case EXCEPTION_FLT_UNDERFLOW:
2270 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2271 if (fp_control_word != ctx->FloatSave.ControlWord) {
2272 // Restore FPCW and mask out FLT exceptions
2273 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2274 // Mask out pending FLT exceptions
2275 ctx->FloatSave.StatusWord &= 0xffffff00;
2276 return EXCEPTION_CONTINUE_EXECUTION;
2277 }
2278 }
2279
2280 if (prev_uef_handler != NULL) {
2281 // We didn't handle this exception so pass it to the previous
2282 // UnhandledExceptionFilter.
2283 return (prev_uef_handler)(exceptionInfo);
2284 }
2285 #else // !_WIN64
2286 // On Windows, the mxcsr control bits are non-volatile across calls
2287 // See also CR 6192333
2288 //
2289 jint MxCsr = INITIAL_MXCSR;
2290 // we can't use StubRoutines::addr_mxcsr_std()
2291 // because in Win64 mxcsr is not saved there
2292 if (MxCsr != ctx->MxCsr) {
2293 ctx->MxCsr = MxCsr;
2294 return EXCEPTION_CONTINUE_EXECUTION;
2295 }
2296 #endif // !_WIN64
2297
2298 return EXCEPTION_CONTINUE_SEARCH;
2299 }
2300
2301 static inline void report_error(Thread* t, DWORD exception_code,
2302 address addr, void* siginfo, void* context) {
2303 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2304
2305 // If UseOsErrorReporting, this will return here and save the error file
2306 // somewhere where we can find it in the minidump.
2307 }
2308
2309 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2310 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2311 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2312 address addr = (address) exceptionRecord->ExceptionInformation[1];
2313 if (Interpreter::contains(pc)) {
2314 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2315 if (!fr->is_first_java_frame()) {
2316 // get_frame_at_stack_banging_point() is only called when we
2317 // have well defined stacks so java_sender() calls do not need
2318 // to assert safe_for_sender() first.
2319 *fr = fr->java_sender();
2320 }
2321 } else {
2322 // more complex code with compiled code
2323 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2324 CodeBlob* cb = CodeCache::find_blob(pc);
2325 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2326 // Not sure where the pc points to, fallback to default
2327 // stack overflow handling
2328 return false;
2329 } else {
2330 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2331 // in compiled code, the stack banging is performed just after the return pc
2332 // has been pushed on the stack
2333 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2334 if (!fr->is_java_frame()) {
2335 // See java_sender() comment above.
2336 *fr = fr->java_sender();
2337 }
2338 }
2339 }
2340 assert(fr->is_java_frame(), "Safety check");
2341 return true;
2342 }
2343
2344 //-----------------------------------------------------------------------------
2345 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2346 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2347 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2348 #ifdef _M_AMD64
2349 address pc = (address) exceptionInfo->ContextRecord->Rip;
2350 #else
2351 address pc = (address) exceptionInfo->ContextRecord->Eip;
2352 #endif
2353 Thread* t = Thread::current_or_null_safe();
2354
2355 // Handle SafeFetch32 and SafeFetchN exceptions.
2356 if (StubRoutines::is_safefetch_fault(pc)) {
2357 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2358 }
2359
2360 #ifndef _WIN64
2361 // Execution protection violation - win32 running on AMD64 only
2362 // Handled first to avoid misdiagnosis as a "normal" access violation;
2363 // This is safe to do because we have a new/unique ExceptionInformation
2364 // code for this condition.
2365 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2366 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2367 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2368 address addr = (address) exceptionRecord->ExceptionInformation[1];
2369
2370 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2371 int page_size = os::vm_page_size();
2372
2373 // Make sure the pc and the faulting address are sane.
2374 //
2375 // If an instruction spans a page boundary, and the page containing
2376 // the beginning of the instruction is executable but the following
2377 // page is not, the pc and the faulting address might be slightly
2378 // different - we still want to unguard the 2nd page in this case.
2379 //
2380 // 15 bytes seems to be a (very) safe value for max instruction size.
2381 bool pc_is_near_addr =
2382 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2383 bool instr_spans_page_boundary =
2384 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2385 (intptr_t) page_size) > 0);
2386
2387 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2388 static volatile address last_addr =
2389 (address) os::non_memory_address_word();
2390
2391 // In conservative mode, don't unguard unless the address is in the VM
2392 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2393 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2394
2395 // Set memory to RWX and retry
2396 address page_start =
2397 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2398 bool res = os::protect_memory((char*) page_start, page_size,
2399 os::MEM_PROT_RWX);
2400
2401 log_debug(os)("Execution protection violation "
2402 "at " INTPTR_FORMAT
2403 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2404 p2i(page_start), (res ? "success" : os::strerror(errno)));
2405
2406 // Set last_addr so if we fault again at the same address, we don't
2407 // end up in an endless loop.
2408 //
2409 // There are two potential complications here. Two threads trapping
2410 // at the same address at the same time could cause one of the
2411 // threads to think it already unguarded, and abort the VM. Likely
2412 // very rare.
2413 //
2414 // The other race involves two threads alternately trapping at
2415 // different addresses and failing to unguard the page, resulting in
2416 // an endless loop. This condition is probably even more unlikely
2417 // than the first.
2418 //
2419 // Although both cases could be avoided by using locks or thread
2420 // local last_addr, these solutions are unnecessary complication:
2421 // this handler is a best-effort safety net, not a complete solution.
2422 // It is disabled by default and should only be used as a workaround
2423 // in case we missed any no-execute-unsafe VM code.
2424
2425 last_addr = addr;
2426
2427 return EXCEPTION_CONTINUE_EXECUTION;
2428 }
2429 }
2430
2431 // Last unguard failed or not unguarding
2432 tty->print_raw_cr("Execution protection violation");
2433 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2434 exceptionInfo->ContextRecord);
2435 return EXCEPTION_CONTINUE_SEARCH;
2436 }
2437 }
2438 #endif // _WIN64
2439
2440 // Check to see if we caught the safepoint code in the
2441 // process of write protecting the memory serialization page.
2442 // It write enables the page immediately after protecting it
2443 // so just return.
2444 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2445 if (t != NULL && t->is_Java_thread()) {
2446 JavaThread* thread = (JavaThread*) t;
2447 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2448 address addr = (address) exceptionRecord->ExceptionInformation[1];
2449 if (os::is_memory_serialize_page(thread, addr)) {
2450 // Block current thread until the memory serialize page permission restored.
2451 os::block_on_serialize_page_trap();
2452 return EXCEPTION_CONTINUE_EXECUTION;
2453 }
2454 }
2455 }
2456
2457 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2458 VM_Version::is_cpuinfo_segv_addr(pc)) {
2459 // Verify that OS save/restore AVX registers.
2460 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2461 }
2462
2463 if (t != NULL && t->is_Java_thread()) {
2464 JavaThread* thread = (JavaThread*) t;
2465 bool in_java = thread->thread_state() == _thread_in_Java;
2466
2467 // Handle potential stack overflows up front.
2468 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2469 if (thread->stack_guards_enabled()) {
2470 if (in_java) {
2471 frame fr;
2472 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2473 address addr = (address) exceptionRecord->ExceptionInformation[1];
2474 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2475 assert(fr.is_java_frame(), "Must be a Java frame");
2476 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2477 }
2478 }
2479 // Yellow zone violation. The o/s has unprotected the first yellow
2480 // zone page for us. Note: must call disable_stack_yellow_zone to
2481 // update the enabled status, even if the zone contains only one page.
2482 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2483 thread->disable_stack_yellow_reserved_zone();
2484 // If not in java code, return and hope for the best.
2485 return in_java
2486 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2487 : EXCEPTION_CONTINUE_EXECUTION;
2488 } else {
2489 // Fatal red zone violation.
2490 thread->disable_stack_red_zone();
2491 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2492 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2493 exceptionInfo->ContextRecord);
2494 return EXCEPTION_CONTINUE_SEARCH;
2495 }
2496 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2497 // Either stack overflow or null pointer exception.
2498 if (in_java) {
2499 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2500 address addr = (address) exceptionRecord->ExceptionInformation[1];
2501 address stack_end = thread->stack_end();
2502 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2503 // Stack overflow.
2504 assert(!os::uses_stack_guard_pages(),
2505 "should be caught by red zone code above.");
2506 return Handle_Exception(exceptionInfo,
2507 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2508 }
2509 // Check for safepoint polling and implicit null
2510 // We only expect null pointers in the stubs (vtable)
2511 // the rest are checked explicitly now.
2512 CodeBlob* cb = CodeCache::find_blob(pc);
2513 if (cb != NULL) {
2514 if (os::is_poll_address(addr)) {
2515 address stub = SharedRuntime::get_poll_stub(pc);
2516 return Handle_Exception(exceptionInfo, stub);
2517 }
2518 }
2519 {
2520 #ifdef _WIN64
2521 // If it's a legal stack address map the entire region in
2522 //
2523 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2524 address addr = (address) exceptionRecord->ExceptionInformation[1];
2525 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2526 addr = (address)((uintptr_t)addr &
2527 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2528 os::commit_memory((char *)addr, thread->stack_base() - addr,
2529 !ExecMem);
2530 return EXCEPTION_CONTINUE_EXECUTION;
2531 } else
2532 #endif
2533 {
2534 // Null pointer exception.
2535 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2536 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2537 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2538 }
2539 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2540 exceptionInfo->ContextRecord);
2541 return EXCEPTION_CONTINUE_SEARCH;
2542 }
2543 }
2544 }
2545
2546 #ifdef _WIN64
2547 // Special care for fast JNI field accessors.
2548 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2549 // in and the heap gets shrunk before the field access.
2550 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2551 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2552 if (addr != (address)-1) {
2553 return Handle_Exception(exceptionInfo, addr);
2554 }
2555 }
2556 #endif
2557
2558 // Stack overflow or null pointer exception in native code.
2559 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2560 exceptionInfo->ContextRecord);
2561 return EXCEPTION_CONTINUE_SEARCH;
2562 } // /EXCEPTION_ACCESS_VIOLATION
2563 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2564
2565 if (in_java) {
2566 switch (exception_code) {
2567 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2568 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2569
2570 case EXCEPTION_INT_OVERFLOW:
2571 return Handle_IDiv_Exception(exceptionInfo);
2572
2573 } // switch
2574 }
2575 if (((thread->thread_state() == _thread_in_Java) ||
2576 (thread->thread_state() == _thread_in_native)) &&
2577 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2578 LONG result=Handle_FLT_Exception(exceptionInfo);
2579 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2580 }
2581 }
2582
2583 if (exception_code != EXCEPTION_BREAKPOINT) {
2584 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2585 exceptionInfo->ContextRecord);
2586 }
2587 return EXCEPTION_CONTINUE_SEARCH;
2588 }
2589
2590 #ifndef _WIN64
2591 // Special care for fast JNI accessors.
2592 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2593 // the heap gets shrunk before the field access.
2594 // Need to install our own structured exception handler since native code may
2595 // install its own.
2596 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2597 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2598 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2599 address pc = (address) exceptionInfo->ContextRecord->Eip;
2600 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2601 if (addr != (address)-1) {
2602 return Handle_Exception(exceptionInfo, addr);
2603 }
2604 }
2605 return EXCEPTION_CONTINUE_SEARCH;
2606 }
2607
2608 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2609 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2610 jobject obj, \
2611 jfieldID fieldID) { \
2612 __try { \
2613 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2614 obj, \
2615 fieldID); \
2616 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2617 _exception_info())) { \
2618 } \
2619 return 0; \
2620 }
2621
2622 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2623 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2624 DEFINE_FAST_GETFIELD(jchar, char, Char)
2625 DEFINE_FAST_GETFIELD(jshort, short, Short)
2626 DEFINE_FAST_GETFIELD(jint, int, Int)
2627 DEFINE_FAST_GETFIELD(jlong, long, Long)
2628 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2629 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2630
2631 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2632 switch (type) {
2633 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2634 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2635 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2636 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2637 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2638 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2639 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2640 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2641 default: ShouldNotReachHere();
2642 }
2643 return (address)-1;
2644 }
2645 #endif
2646
2647 // Virtual Memory
2648
2649 int os::vm_page_size() { return os::win32::vm_page_size(); }
2650 int os::vm_allocation_granularity() {
2651 return os::win32::vm_allocation_granularity();
2652 }
2653
2654 // Windows large page support is available on Windows 2003. In order to use
2655 // large page memory, the administrator must first assign additional privilege
2656 // to the user:
2657 // + select Control Panel -> Administrative Tools -> Local Security Policy
2658 // + select Local Policies -> User Rights Assignment
2659 // + double click "Lock pages in memory", add users and/or groups
2660 // + reboot
2661 // Note the above steps are needed for administrator as well, as administrators
2662 // by default do not have the privilege to lock pages in memory.
2663 //
2664 // Note about Windows 2003: although the API supports committing large page
2665 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2666 // scenario, I found through experiment it only uses large page if the entire
2667 // memory region is reserved and committed in a single VirtualAlloc() call.
2668 // This makes Windows large page support more or less like Solaris ISM, in
2669 // that the entire heap must be committed upfront. This probably will change
2670 // in the future, if so the code below needs to be revisited.
2671
2672 #ifndef MEM_LARGE_PAGES
2673 #define MEM_LARGE_PAGES 0x20000000
2674 #endif
2675
2676 static HANDLE _hProcess;
2677 static HANDLE _hToken;
2678
2679 // Container for NUMA node list info
2680 class NUMANodeListHolder {
2681 private:
2682 int *_numa_used_node_list; // allocated below
2683 int _numa_used_node_count;
2684
2685 void free_node_list() {
2686 if (_numa_used_node_list != NULL) {
2687 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2688 }
2689 }
2690
2691 public:
2692 NUMANodeListHolder() {
2693 _numa_used_node_count = 0;
2694 _numa_used_node_list = NULL;
2695 // do rest of initialization in build routine (after function pointers are set up)
2696 }
2697
2698 ~NUMANodeListHolder() {
2699 free_node_list();
2700 }
2701
2702 bool build() {
2703 DWORD_PTR proc_aff_mask;
2704 DWORD_PTR sys_aff_mask;
2705 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2706 ULONG highest_node_number;
2707 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2708 free_node_list();
2709 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2710 for (unsigned int i = 0; i <= highest_node_number; i++) {
2711 ULONGLONG proc_mask_numa_node;
2712 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2713 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2714 _numa_used_node_list[_numa_used_node_count++] = i;
2715 }
2716 }
2717 return (_numa_used_node_count > 1);
2718 }
2719
2720 int get_count() { return _numa_used_node_count; }
2721 int get_node_list_entry(int n) {
2722 // for indexes out of range, returns -1
2723 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2724 }
2725
2726 } numa_node_list_holder;
2727
2728
2729
2730 static size_t _large_page_size = 0;
2731
2732 static bool request_lock_memory_privilege() {
2733 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2734 os::current_process_id());
2735
2736 LUID luid;
2737 if (_hProcess != NULL &&
2738 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2739 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2740
2741 TOKEN_PRIVILEGES tp;
2742 tp.PrivilegeCount = 1;
2743 tp.Privileges[0].Luid = luid;
2744 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2745
2746 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2747 // privilege. Check GetLastError() too. See MSDN document.
2748 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2749 (GetLastError() == ERROR_SUCCESS)) {
2750 return true;
2751 }
2752 }
2753
2754 return false;
2755 }
2756
2757 static void cleanup_after_large_page_init() {
2758 if (_hProcess) CloseHandle(_hProcess);
2759 _hProcess = NULL;
2760 if (_hToken) CloseHandle(_hToken);
2761 _hToken = NULL;
2762 }
2763
2764 static bool numa_interleaving_init() {
2765 bool success = false;
2766 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2767
2768 // print a warning if UseNUMAInterleaving flag is specified on command line
2769 bool warn_on_failure = use_numa_interleaving_specified;
2770 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2771
2772 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2773 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2774 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2775
2776 if (numa_node_list_holder.build()) {
2777 if (log_is_enabled(Debug, os, cpu)) {
2778 Log(os, cpu) log;
2779 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2780 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2781 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2782 }
2783 }
2784 success = true;
2785 } else {
2786 WARN("Process does not cover multiple NUMA nodes.");
2787 }
2788 if (!success) {
2789 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2790 }
2791 return success;
2792 #undef WARN
2793 }
2794
2795 // this routine is used whenever we need to reserve a contiguous VA range
2796 // but we need to make separate VirtualAlloc calls for each piece of the range
2797 // Reasons for doing this:
2798 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2799 // * UseNUMAInterleaving requires a separate node for each piece
2800 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2801 DWORD prot,
2802 bool should_inject_error = false) {
2803 char * p_buf;
2804 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2805 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2806 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2807
2808 // first reserve enough address space in advance since we want to be
2809 // able to break a single contiguous virtual address range into multiple
2810 // large page commits but WS2003 does not allow reserving large page space
2811 // so we just use 4K pages for reserve, this gives us a legal contiguous
2812 // address space. then we will deallocate that reservation, and re alloc
2813 // using large pages
2814 const size_t size_of_reserve = bytes + chunk_size;
2815 if (bytes > size_of_reserve) {
2816 // Overflowed.
2817 return NULL;
2818 }
2819 p_buf = (char *) VirtualAlloc(addr,
2820 size_of_reserve, // size of Reserve
2821 MEM_RESERVE,
2822 PAGE_READWRITE);
2823 // If reservation failed, return NULL
2824 if (p_buf == NULL) return NULL;
2825 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2826 os::release_memory(p_buf, bytes + chunk_size);
2827
2828 // we still need to round up to a page boundary (in case we are using large pages)
2829 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2830 // instead we handle this in the bytes_to_rq computation below
2831 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2832
2833 // now go through and allocate one chunk at a time until all bytes are
2834 // allocated
2835 size_t bytes_remaining = bytes;
2836 // An overflow of align_size_up() would have been caught above
2837 // in the calculation of size_of_reserve.
2838 char * next_alloc_addr = p_buf;
2839 HANDLE hProc = GetCurrentProcess();
2840
2841 #ifdef ASSERT
2842 // Variable for the failure injection
2843 long ran_num = os::random();
2844 size_t fail_after = ran_num % bytes;
2845 #endif
2846
2847 int count=0;
2848 while (bytes_remaining) {
2849 // select bytes_to_rq to get to the next chunk_size boundary
2850
2851 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2852 // Note allocate and commit
2853 char * p_new;
2854
2855 #ifdef ASSERT
2856 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2857 #else
2858 const bool inject_error_now = false;
2859 #endif
2860
2861 if (inject_error_now) {
2862 p_new = NULL;
2863 } else {
2864 if (!UseNUMAInterleaving) {
2865 p_new = (char *) VirtualAlloc(next_alloc_addr,
2866 bytes_to_rq,
2867 flags,
2868 prot);
2869 } else {
2870 // get the next node to use from the used_node_list
2871 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2872 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2873 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2874 }
2875 }
2876
2877 if (p_new == NULL) {
2878 // Free any allocated pages
2879 if (next_alloc_addr > p_buf) {
2880 // Some memory was committed so release it.
2881 size_t bytes_to_release = bytes - bytes_remaining;
2882 // NMT has yet to record any individual blocks, so it
2883 // need to create a dummy 'reserve' record to match
2884 // the release.
2885 MemTracker::record_virtual_memory_reserve((address)p_buf,
2886 bytes_to_release, CALLER_PC);
2887 os::release_memory(p_buf, bytes_to_release);
2888 }
2889 #ifdef ASSERT
2890 if (should_inject_error) {
2891 log_develop_debug(pagesize)("Reserving pages individually failed.");
2892 }
2893 #endif
2894 return NULL;
2895 }
2896
2897 bytes_remaining -= bytes_to_rq;
2898 next_alloc_addr += bytes_to_rq;
2899 count++;
2900 }
2901 // Although the memory is allocated individually, it is returned as one.
2902 // NMT records it as one block.
2903 if ((flags & MEM_COMMIT) != 0) {
2904 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2905 } else {
2906 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2907 }
2908
2909 // made it this far, success
2910 return p_buf;
2911 }
2912
2913
2914
2915 void os::large_page_init() {
2916 if (!UseLargePages) return;
2917
2918 // print a warning if any large page related flag is specified on command line
2919 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2920 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2921 bool success = false;
2922
2923 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2924 if (request_lock_memory_privilege()) {
2925 size_t s = GetLargePageMinimum();
2926 if (s) {
2927 #if defined(IA32) || defined(AMD64)
2928 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2929 WARN("JVM cannot use large pages bigger than 4mb.");
2930 } else {
2931 #endif
2932 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2933 _large_page_size = LargePageSizeInBytes;
2934 } else {
2935 _large_page_size = s;
2936 }
2937 success = true;
2938 #if defined(IA32) || defined(AMD64)
2939 }
2940 #endif
2941 } else {
2942 WARN("Large page is not supported by the processor.");
2943 }
2944 } else {
2945 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2946 }
2947 #undef WARN
2948
2949 const size_t default_page_size = (size_t) vm_page_size();
2950 if (success && _large_page_size > default_page_size) {
2951 _page_sizes[0] = _large_page_size;
2952 _page_sizes[1] = default_page_size;
2953 _page_sizes[2] = 0;
2954 }
2955
2956 cleanup_after_large_page_init();
2957 UseLargePages = success;
2958 }
2959
2960 // On win32, one cannot release just a part of reserved memory, it's an
2961 // all or nothing deal. When we split a reservation, we must break the
2962 // reservation into two reservations.
2963 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2964 bool realloc) {
2965 if (size > 0) {
2966 release_memory(base, size);
2967 if (realloc) {
2968 reserve_memory(split, base);
2969 }
2970 if (size != split) {
2971 reserve_memory(size - split, base + split);
2972 }
2973 }
2974 }
2975
2976 // Multiple threads can race in this code but it's not possible to unmap small sections of
2977 // virtual space to get requested alignment, like posix-like os's.
2978 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
2979 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
2980 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
2981 "Alignment must be a multiple of allocation granularity (page size)");
2982 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
2983
2984 size_t extra_size = size + alignment;
2985 assert(extra_size >= size, "overflow, size is too large to allow alignment");
2986
2987 char* aligned_base = NULL;
2988
2989 do {
2990 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
2991 if (extra_base == NULL) {
2992 return NULL;
2993 }
2994 // Do manual alignment
2995 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
2996
2997 os::release_memory(extra_base, extra_size);
2998
2999 aligned_base = os::reserve_memory(size, aligned_base);
3000
3001 } while (aligned_base == NULL);
3002
3003 return aligned_base;
3004 }
3005
3006 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3007 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3008 "reserve alignment");
3009 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3010 char* res;
3011 // note that if UseLargePages is on, all the areas that require interleaving
3012 // will go thru reserve_memory_special rather than thru here.
3013 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3014 if (!use_individual) {
3015 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3016 } else {
3017 elapsedTimer reserveTimer;
3018 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3019 // in numa interleaving, we have to allocate pages individually
3020 // (well really chunks of NUMAInterleaveGranularity size)
3021 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3022 if (res == NULL) {
3023 warning("NUMA page allocation failed");
3024 }
3025 if (Verbose && PrintMiscellaneous) {
3026 reserveTimer.stop();
3027 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3028 reserveTimer.milliseconds(), reserveTimer.ticks());
3029 }
3030 }
3031 assert(res == NULL || addr == NULL || addr == res,
3032 "Unexpected address from reserve.");
3033
3034 return res;
3035 }
3036
3037 // Reserve memory at an arbitrary address, only if that area is
3038 // available (and not reserved for something else).
3039 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3040 // Windows os::reserve_memory() fails of the requested address range is
3041 // not avilable.
3042 return reserve_memory(bytes, requested_addr);
3043 }
3044
3045 size_t os::large_page_size() {
3046 return _large_page_size;
3047 }
3048
3049 bool os::can_commit_large_page_memory() {
3050 // Windows only uses large page memory when the entire region is reserved
3051 // and committed in a single VirtualAlloc() call. This may change in the
3052 // future, but with Windows 2003 it's not possible to commit on demand.
3053 return false;
3054 }
3055
3056 bool os::can_execute_large_page_memory() {
3057 return true;
3058 }
3059
3060 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3061 bool exec) {
3062 assert(UseLargePages, "only for large pages");
3063
3064 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3065 return NULL; // Fallback to small pages.
3066 }
3067
3068 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3069 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3070
3071 // with large pages, there are two cases where we need to use Individual Allocation
3072 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3073 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3074 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3075 log_debug(pagesize)("Reserving large pages individually.");
3076
3077 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3078 if (p_buf == NULL) {
3079 // give an appropriate warning message
3080 if (UseNUMAInterleaving) {
3081 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3082 }
3083 if (UseLargePagesIndividualAllocation) {
3084 warning("Individually allocated large pages failed, "
3085 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3086 }
3087 return NULL;
3088 }
3089
3090 return p_buf;
3091
3092 } else {
3093 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3094
3095 // normal policy just allocate it all at once
3096 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3097 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3098 if (res != NULL) {
3099 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3100 }
3101
3102 return res;
3103 }
3104 }
3105
3106 bool os::release_memory_special(char* base, size_t bytes) {
3107 assert(base != NULL, "Sanity check");
3108 return release_memory(base, bytes);
3109 }
3110
3111 void os::print_statistics() {
3112 }
3113
3114 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3115 int err = os::get_last_error();
3116 char buf[256];
3117 size_t buf_len = os::lasterror(buf, sizeof(buf));
3118 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3119 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3120 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3121 }
3122
3123 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3124 if (bytes == 0) {
3125 // Don't bother the OS with noops.
3126 return true;
3127 }
3128 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3129 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3130 // Don't attempt to print anything if the OS call fails. We're
3131 // probably low on resources, so the print itself may cause crashes.
3132
3133 // unless we have NUMAInterleaving enabled, the range of a commit
3134 // is always within a reserve covered by a single VirtualAlloc
3135 // in that case we can just do a single commit for the requested size
3136 if (!UseNUMAInterleaving) {
3137 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3138 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3139 return false;
3140 }
3141 if (exec) {
3142 DWORD oldprot;
3143 // Windows doc says to use VirtualProtect to get execute permissions
3144 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3145 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3146 return false;
3147 }
3148 }
3149 return true;
3150 } else {
3151
3152 // when NUMAInterleaving is enabled, the commit might cover a range that
3153 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3154 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3155 // returns represents the number of bytes that can be committed in one step.
3156 size_t bytes_remaining = bytes;
3157 char * next_alloc_addr = addr;
3158 while (bytes_remaining > 0) {
3159 MEMORY_BASIC_INFORMATION alloc_info;
3160 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3161 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3162 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3163 PAGE_READWRITE) == NULL) {
3164 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3165 exec);)
3166 return false;
3167 }
3168 if (exec) {
3169 DWORD oldprot;
3170 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3171 PAGE_EXECUTE_READWRITE, &oldprot)) {
3172 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3173 exec);)
3174 return false;
3175 }
3176 }
3177 bytes_remaining -= bytes_to_rq;
3178 next_alloc_addr += bytes_to_rq;
3179 }
3180 }
3181 // if we made it this far, return true
3182 return true;
3183 }
3184
3185 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3186 bool exec) {
3187 // alignment_hint is ignored on this OS
3188 return pd_commit_memory(addr, size, exec);
3189 }
3190
3191 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3192 const char* mesg) {
3193 assert(mesg != NULL, "mesg must be specified");
3194 if (!pd_commit_memory(addr, size, exec)) {
3195 warn_fail_commit_memory(addr, size, exec);
3196 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3197 }
3198 }
3199
3200 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3201 size_t alignment_hint, bool exec,
3202 const char* mesg) {
3203 // alignment_hint is ignored on this OS
3204 pd_commit_memory_or_exit(addr, size, exec, mesg);
3205 }
3206
3207 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3208 if (bytes == 0) {
3209 // Don't bother the OS with noops.
3210 return true;
3211 }
3212 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3213 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3214 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3215 }
3216
3217 bool os::pd_release_memory(char* addr, size_t bytes) {
3218 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3219 }
3220
3221 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3222 return os::commit_memory(addr, size, !ExecMem);
3223 }
3224
3225 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3226 return os::uncommit_memory(addr, size);
3227 }
3228
3229 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3230 uint count = 0;
3231 bool ret = false;
3232 size_t bytes_remaining = bytes;
3233 char * next_protect_addr = addr;
3234
3235 // Use VirtualQuery() to get the chunk size.
3236 while (bytes_remaining) {
3237 MEMORY_BASIC_INFORMATION alloc_info;
3238 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3239 return false;
3240 }
3241
3242 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3243 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3244 // but we don't distinguish here as both cases are protected by same API.
3245 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3246 warning("Failed protecting pages individually for chunk #%u", count);
3247 if (!ret) {
3248 return false;
3249 }
3250
3251 bytes_remaining -= bytes_to_protect;
3252 next_protect_addr += bytes_to_protect;
3253 count++;
3254 }
3255 return ret;
3256 }
3257
3258 // Set protections specified
3259 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3260 bool is_committed) {
3261 unsigned int p = 0;
3262 switch (prot) {
3263 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3264 case MEM_PROT_READ: p = PAGE_READONLY; break;
3265 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3266 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3267 default:
3268 ShouldNotReachHere();
3269 }
3270
3271 DWORD old_status;
3272
3273 // Strange enough, but on Win32 one can change protection only for committed
3274 // memory, not a big deal anyway, as bytes less or equal than 64K
3275 if (!is_committed) {
3276 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3277 "cannot commit protection page");
3278 }
3279 // One cannot use os::guard_memory() here, as on Win32 guard page
3280 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3281 //
3282 // Pages in the region become guard pages. Any attempt to access a guard page
3283 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3284 // the guard page status. Guard pages thus act as a one-time access alarm.
3285 bool ret;
3286 if (UseNUMAInterleaving) {
3287 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3288 // so we must protect the chunks individually.
3289 ret = protect_pages_individually(addr, bytes, p, &old_status);
3290 } else {
3291 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3292 }
3293 #ifdef ASSERT
3294 if (!ret) {
3295 int err = os::get_last_error();
3296 char buf[256];
3297 size_t buf_len = os::lasterror(buf, sizeof(buf));
3298 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3299 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3300 buf_len != 0 ? buf : "<no_error_string>", err);
3301 }
3302 #endif
3303 return ret;
3304 }
3305
3306 bool os::guard_memory(char* addr, size_t bytes) {
3307 DWORD old_status;
3308 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3309 }
3310
3311 bool os::unguard_memory(char* addr, size_t bytes) {
3312 DWORD old_status;
3313 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3314 }
3315
3316 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3317 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3318 void os::numa_make_global(char *addr, size_t bytes) { }
3319 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3320 bool os::numa_topology_changed() { return false; }
3321 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3322 int os::numa_get_group_id() { return 0; }
3323 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3324 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3325 // Provide an answer for UMA systems
3326 ids[0] = 0;
3327 return 1;
3328 } else {
3329 // check for size bigger than actual groups_num
3330 size = MIN2(size, numa_get_groups_num());
3331 for (int i = 0; i < (int)size; i++) {
3332 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3333 }
3334 return size;
3335 }
3336 }
3337
3338 bool os::get_page_info(char *start, page_info* info) {
3339 return false;
3340 }
3341
3342 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3343 page_info* page_found) {
3344 return end;
3345 }
3346
3347 char* os::non_memory_address_word() {
3348 // Must never look like an address returned by reserve_memory,
3349 // even in its subfields (as defined by the CPU immediate fields,
3350 // if the CPU splits constants across multiple instructions).
3351 return (char*)-1;
3352 }
3353
3354 #define MAX_ERROR_COUNT 100
3355 #define SYS_THREAD_ERROR 0xffffffffUL
3356
3357 void os::pd_start_thread(Thread* thread) {
3358 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3359 // Returns previous suspend state:
3360 // 0: Thread was not suspended
3361 // 1: Thread is running now
3362 // >1: Thread is still suspended.
3363 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3364 }
3365
3366 class HighResolutionInterval : public CHeapObj<mtThread> {
3367 // The default timer resolution seems to be 10 milliseconds.
3368 // (Where is this written down?)
3369 // If someone wants to sleep for only a fraction of the default,
3370 // then we set the timer resolution down to 1 millisecond for
3371 // the duration of their interval.
3372 // We carefully set the resolution back, since otherwise we
3373 // seem to incur an overhead (3%?) that we don't need.
3374 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3375 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3376 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3377 // timeBeginPeriod() if the relative error exceeded some threshold.
3378 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3379 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3380 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3381 // resolution timers running.
3382 private:
3383 jlong resolution;
3384 public:
3385 HighResolutionInterval(jlong ms) {
3386 resolution = ms % 10L;
3387 if (resolution != 0) {
3388 MMRESULT result = timeBeginPeriod(1L);
3389 }
3390 }
3391 ~HighResolutionInterval() {
3392 if (resolution != 0) {
3393 MMRESULT result = timeEndPeriod(1L);
3394 }
3395 resolution = 0L;
3396 }
3397 };
3398
3399 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3400 jlong limit = (jlong) MAXDWORD;
3401
3402 while (ms > limit) {
3403 int res;
3404 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3405 return res;
3406 }
3407 ms -= limit;
3408 }
3409
3410 assert(thread == Thread::current(), "thread consistency check");
3411 OSThread* osthread = thread->osthread();
3412 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3413 int result;
3414 if (interruptable) {
3415 assert(thread->is_Java_thread(), "must be java thread");
3416 JavaThread *jt = (JavaThread *) thread;
3417 ThreadBlockInVM tbivm(jt);
3418
3419 jt->set_suspend_equivalent();
3420 // cleared by handle_special_suspend_equivalent_condition() or
3421 // java_suspend_self() via check_and_wait_while_suspended()
3422
3423 HANDLE events[1];
3424 events[0] = osthread->interrupt_event();
3425 HighResolutionInterval *phri=NULL;
3426 if (!ForceTimeHighResolution) {
3427 phri = new HighResolutionInterval(ms);
3428 }
3429 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3430 result = OS_TIMEOUT;
3431 } else {
3432 ResetEvent(osthread->interrupt_event());
3433 osthread->set_interrupted(false);
3434 result = OS_INTRPT;
3435 }
3436 delete phri; //if it is NULL, harmless
3437
3438 // were we externally suspended while we were waiting?
3439 jt->check_and_wait_while_suspended();
3440 } else {
3441 assert(!thread->is_Java_thread(), "must not be java thread");
3442 Sleep((long) ms);
3443 result = OS_TIMEOUT;
3444 }
3445 return result;
3446 }
3447
3448 // Short sleep, direct OS call.
3449 //
3450 // ms = 0, means allow others (if any) to run.
3451 //
3452 void os::naked_short_sleep(jlong ms) {
3453 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3454 Sleep(ms);
3455 }
3456
3457 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3458 void os::infinite_sleep() {
3459 while (true) { // sleep forever ...
3460 Sleep(100000); // ... 100 seconds at a time
3461 }
3462 }
3463
3464 typedef BOOL (WINAPI * STTSignature)(void);
3465
3466 void os::naked_yield() {
3467 // Consider passing back the return value from SwitchToThread().
3468 SwitchToThread();
3469 }
3470
3471 // Win32 only gives you access to seven real priorities at a time,
3472 // so we compress Java's ten down to seven. It would be better
3473 // if we dynamically adjusted relative priorities.
3474
3475 int os::java_to_os_priority[CriticalPriority + 1] = {
3476 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3477 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3478 THREAD_PRIORITY_LOWEST, // 2
3479 THREAD_PRIORITY_BELOW_NORMAL, // 3
3480 THREAD_PRIORITY_BELOW_NORMAL, // 4
3481 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3482 THREAD_PRIORITY_NORMAL, // 6
3483 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3484 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3485 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3486 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3487 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3488 };
3489
3490 int prio_policy1[CriticalPriority + 1] = {
3491 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3492 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3493 THREAD_PRIORITY_LOWEST, // 2
3494 THREAD_PRIORITY_BELOW_NORMAL, // 3
3495 THREAD_PRIORITY_BELOW_NORMAL, // 4
3496 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3497 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3498 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3499 THREAD_PRIORITY_HIGHEST, // 8
3500 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3501 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3502 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3503 };
3504
3505 static int prio_init() {
3506 // If ThreadPriorityPolicy is 1, switch tables
3507 if (ThreadPriorityPolicy == 1) {
3508 int i;
3509 for (i = 0; i < CriticalPriority + 1; i++) {
3510 os::java_to_os_priority[i] = prio_policy1[i];
3511 }
3512 }
3513 if (UseCriticalJavaThreadPriority) {
3514 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3515 }
3516 return 0;
3517 }
3518
3519 OSReturn os::set_native_priority(Thread* thread, int priority) {
3520 if (!UseThreadPriorities) return OS_OK;
3521 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3522 return ret ? OS_OK : OS_ERR;
3523 }
3524
3525 OSReturn os::get_native_priority(const Thread* const thread,
3526 int* priority_ptr) {
3527 if (!UseThreadPriorities) {
3528 *priority_ptr = java_to_os_priority[NormPriority];
3529 return OS_OK;
3530 }
3531 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3532 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3533 assert(false, "GetThreadPriority failed");
3534 return OS_ERR;
3535 }
3536 *priority_ptr = os_prio;
3537 return OS_OK;
3538 }
3539
3540
3541 // Hint to the underlying OS that a task switch would not be good.
3542 // Void return because it's a hint and can fail.
3543 void os::hint_no_preempt() {}
3544
3545 void os::interrupt(Thread* thread) {
3546 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3547 Threads_lock->owned_by_self(),
3548 "possibility of dangling Thread pointer");
3549
3550 OSThread* osthread = thread->osthread();
3551 osthread->set_interrupted(true);
3552 // More than one thread can get here with the same value of osthread,
3553 // resulting in multiple notifications. We do, however, want the store
3554 // to interrupted() to be visible to other threads before we post
3555 // the interrupt event.
3556 OrderAccess::release();
3557 SetEvent(osthread->interrupt_event());
3558 // For JSR166: unpark after setting status
3559 if (thread->is_Java_thread()) {
3560 ((JavaThread*)thread)->parker()->unpark();
3561 }
3562
3563 ParkEvent * ev = thread->_ParkEvent;
3564 if (ev != NULL) ev->unpark();
3565 }
3566
3567
3568 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3569 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3570 "possibility of dangling Thread pointer");
3571
3572 OSThread* osthread = thread->osthread();
3573 // There is no synchronization between the setting of the interrupt
3574 // and it being cleared here. It is critical - see 6535709 - that
3575 // we only clear the interrupt state, and reset the interrupt event,
3576 // if we are going to report that we were indeed interrupted - else
3577 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3578 // depending on the timing. By checking thread interrupt event to see
3579 // if the thread gets real interrupt thus prevent spurious wakeup.
3580 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3581 if (interrupted && clear_interrupted) {
3582 osthread->set_interrupted(false);
3583 ResetEvent(osthread->interrupt_event());
3584 } // Otherwise leave the interrupted state alone
3585
3586 return interrupted;
3587 }
3588
3589 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3590 ExtendedPC os::get_thread_pc(Thread* thread) {
3591 CONTEXT context;
3592 context.ContextFlags = CONTEXT_CONTROL;
3593 HANDLE handle = thread->osthread()->thread_handle();
3594 if (GetThreadContext(handle, &context)) {
3595 #ifdef _M_AMD64
3596 return ExtendedPC((address) context.Rip);
3597 #else
3598 return ExtendedPC((address) context.Eip);
3599 #endif
3600 } else {
3601 return ExtendedPC(NULL);
3602 }
3603 }
3604
3605 // GetCurrentThreadId() returns DWORD
3606 intx os::current_thread_id() { return GetCurrentThreadId(); }
3607
3608 static int _initial_pid = 0;
3609
3610 int os::current_process_id() {
3611 return (_initial_pid ? _initial_pid : _getpid());
3612 }
3613
3614 int os::win32::_vm_page_size = 0;
3615 int os::win32::_vm_allocation_granularity = 0;
3616 int os::win32::_processor_type = 0;
3617 // Processor level is not available on non-NT systems, use vm_version instead
3618 int os::win32::_processor_level = 0;
3619 julong os::win32::_physical_memory = 0;
3620 size_t os::win32::_default_stack_size = 0;
3621
3622 intx os::win32::_os_thread_limit = 0;
3623 volatile intx os::win32::_os_thread_count = 0;
3624
3625 bool os::win32::_is_windows_server = false;
3626
3627 // 6573254
3628 // Currently, the bug is observed across all the supported Windows releases,
3629 // including the latest one (as of this writing - Windows Server 2012 R2)
3630 bool os::win32::_has_exit_bug = true;
3631
3632 void os::win32::initialize_system_info() {
3633 SYSTEM_INFO si;
3634 GetSystemInfo(&si);
3635 _vm_page_size = si.dwPageSize;
3636 _vm_allocation_granularity = si.dwAllocationGranularity;
3637 _processor_type = si.dwProcessorType;
3638 _processor_level = si.wProcessorLevel;
3639 set_processor_count(si.dwNumberOfProcessors);
3640
3641 MEMORYSTATUSEX ms;
3642 ms.dwLength = sizeof(ms);
3643
3644 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3645 // dwMemoryLoad (% of memory in use)
3646 GlobalMemoryStatusEx(&ms);
3647 _physical_memory = ms.ullTotalPhys;
3648
3649 if (FLAG_IS_DEFAULT(MaxRAM)) {
3650 // Adjust MaxRAM according to the maximum virtual address space available.
3651 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3652 }
3653
3654 OSVERSIONINFOEX oi;
3655 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3656 GetVersionEx((OSVERSIONINFO*)&oi);
3657 switch (oi.dwPlatformId) {
3658 case VER_PLATFORM_WIN32_NT:
3659 {
3660 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3661 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3662 oi.wProductType == VER_NT_SERVER) {
3663 _is_windows_server = true;
3664 }
3665 }
3666 break;
3667 default: fatal("Unknown platform");
3668 }
3669
3670 _default_stack_size = os::current_stack_size();
3671 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3672 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3673 "stack size not a multiple of page size");
3674
3675 initialize_performance_counter();
3676 }
3677
3678
3679 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3680 int ebuflen) {
3681 char path[MAX_PATH];
3682 DWORD size;
3683 DWORD pathLen = (DWORD)sizeof(path);
3684 HINSTANCE result = NULL;
3685
3686 // only allow library name without path component
3687 assert(strchr(name, '\\') == NULL, "path not allowed");
3688 assert(strchr(name, ':') == NULL, "path not allowed");
3689 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3690 jio_snprintf(ebuf, ebuflen,
3691 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3692 return NULL;
3693 }
3694
3695 // search system directory
3696 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3697 if (size >= pathLen) {
3698 return NULL; // truncated
3699 }
3700 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3701 return NULL; // truncated
3702 }
3703 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3704 return result;
3705 }
3706 }
3707
3708 // try Windows directory
3709 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3710 if (size >= pathLen) {
3711 return NULL; // truncated
3712 }
3713 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3714 return NULL; // truncated
3715 }
3716 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3717 return result;
3718 }
3719 }
3720
3721 jio_snprintf(ebuf, ebuflen,
3722 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3723 return NULL;
3724 }
3725
3726 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3727 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3728
3729 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3730 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3731 return TRUE;
3732 }
3733
3734 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3735 // Basic approach:
3736 // - Each exiting thread registers its intent to exit and then does so.
3737 // - A thread trying to terminate the process must wait for all
3738 // threads currently exiting to complete their exit.
3739
3740 if (os::win32::has_exit_bug()) {
3741 // The array holds handles of the threads that have started exiting by calling
3742 // _endthreadex().
3743 // Should be large enough to avoid blocking the exiting thread due to lack of
3744 // a free slot.
3745 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3746 static int handle_count = 0;
3747
3748 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3749 static CRITICAL_SECTION crit_sect;
3750 static volatile jint process_exiting = 0;
3751 int i, j;
3752 DWORD res;
3753 HANDLE hproc, hthr;
3754
3755 // We only attempt to register threads until a process exiting
3756 // thread manages to set the process_exiting flag. Any threads
3757 // that come through here after the process_exiting flag is set
3758 // are unregistered and will be caught in the SuspendThread()
3759 // infinite loop below.
3760 bool registered = false;
3761
3762 // The first thread that reached this point, initializes the critical section.
3763 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3764 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3765 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3766 if (what != EPT_THREAD) {
3767 // Atomically set process_exiting before the critical section
3768 // to increase the visibility between racing threads.
3769 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3770 }
3771 EnterCriticalSection(&crit_sect);
3772
3773 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3774 // Remove from the array those handles of the threads that have completed exiting.
3775 for (i = 0, j = 0; i < handle_count; ++i) {
3776 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3777 if (res == WAIT_TIMEOUT) {
3778 handles[j++] = handles[i];
3779 } else {
3780 if (res == WAIT_FAILED) {
3781 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3782 GetLastError(), __FILE__, __LINE__);
3783 }
3784 // Don't keep the handle, if we failed waiting for it.
3785 CloseHandle(handles[i]);
3786 }
3787 }
3788
3789 // If there's no free slot in the array of the kept handles, we'll have to
3790 // wait until at least one thread completes exiting.
3791 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3792 // Raise the priority of the oldest exiting thread to increase its chances
3793 // to complete sooner.
3794 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3795 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3796 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3797 i = (res - WAIT_OBJECT_0);
3798 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3799 for (; i < handle_count; ++i) {
3800 handles[i] = handles[i + 1];
3801 }
3802 } else {
3803 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3804 (res == WAIT_FAILED ? "failed" : "timed out"),
3805 GetLastError(), __FILE__, __LINE__);
3806 // Don't keep handles, if we failed waiting for them.
3807 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3808 CloseHandle(handles[i]);
3809 }
3810 handle_count = 0;
3811 }
3812 }
3813
3814 // Store a duplicate of the current thread handle in the array of handles.
3815 hproc = GetCurrentProcess();
3816 hthr = GetCurrentThread();
3817 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3818 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3819 warning("DuplicateHandle failed (%u) in %s: %d\n",
3820 GetLastError(), __FILE__, __LINE__);
3821
3822 // We can't register this thread (no more handles) so this thread
3823 // may be racing with a thread that is calling exit(). If the thread
3824 // that is calling exit() has managed to set the process_exiting
3825 // flag, then this thread will be caught in the SuspendThread()
3826 // infinite loop below which closes that race. A small timing
3827 // window remains before the process_exiting flag is set, but it
3828 // is only exposed when we are out of handles.
3829 } else {
3830 ++handle_count;
3831 registered = true;
3832
3833 // The current exiting thread has stored its handle in the array, and now
3834 // should leave the critical section before calling _endthreadex().
3835 }
3836
3837 } else if (what != EPT_THREAD && handle_count > 0) {
3838 jlong start_time, finish_time, timeout_left;
3839 // Before ending the process, make sure all the threads that had called
3840 // _endthreadex() completed.
3841
3842 // Set the priority level of the current thread to the same value as
3843 // the priority level of exiting threads.
3844 // This is to ensure it will be given a fair chance to execute if
3845 // the timeout expires.
3846 hthr = GetCurrentThread();
3847 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3848 start_time = os::javaTimeNanos();
3849 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3850 for (i = 0; ; ) {
3851 int portion_count = handle_count - i;
3852 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3853 portion_count = MAXIMUM_WAIT_OBJECTS;
3854 }
3855 for (j = 0; j < portion_count; ++j) {
3856 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3857 }
3858 timeout_left = (finish_time - start_time) / 1000000L;
3859 if (timeout_left < 0) {
3860 timeout_left = 0;
3861 }
3862 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3863 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3864 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3865 (res == WAIT_FAILED ? "failed" : "timed out"),
3866 GetLastError(), __FILE__, __LINE__);
3867 // Reset portion_count so we close the remaining
3868 // handles due to this error.
3869 portion_count = handle_count - i;
3870 }
3871 for (j = 0; j < portion_count; ++j) {
3872 CloseHandle(handles[i + j]);
3873 }
3874 if ((i += portion_count) >= handle_count) {
3875 break;
3876 }
3877 start_time = os::javaTimeNanos();
3878 }
3879 handle_count = 0;
3880 }
3881
3882 LeaveCriticalSection(&crit_sect);
3883 }
3884
3885 if (!registered &&
3886 OrderAccess::load_acquire(&process_exiting) != 0 &&
3887 process_exiting != (jint)GetCurrentThreadId()) {
3888 // Some other thread is about to call exit(), so we don't let
3889 // the current unregistered thread proceed to exit() or _endthreadex()
3890 while (true) {
3891 SuspendThread(GetCurrentThread());
3892 // Avoid busy-wait loop, if SuspendThread() failed.
3893 Sleep(EXIT_TIMEOUT);
3894 }
3895 }
3896 }
3897
3898 // We are here if either
3899 // - there's no 'race at exit' bug on this OS release;
3900 // - initialization of the critical section failed (unlikely);
3901 // - the current thread has registered itself and left the critical section;
3902 // - the process-exiting thread has raised the flag and left the critical section.
3903 if (what == EPT_THREAD) {
3904 _endthreadex((unsigned)exit_code);
3905 } else if (what == EPT_PROCESS) {
3906 ::exit(exit_code);
3907 } else {
3908 _exit(exit_code);
3909 }
3910
3911 // Should not reach here
3912 return exit_code;
3913 }
3914
3915 #undef EXIT_TIMEOUT
3916
3917 void os::win32::setmode_streams() {
3918 _setmode(_fileno(stdin), _O_BINARY);
3919 _setmode(_fileno(stdout), _O_BINARY);
3920 _setmode(_fileno(stderr), _O_BINARY);
3921 }
3922
3923
3924 bool os::is_debugger_attached() {
3925 return IsDebuggerPresent() ? true : false;
3926 }
3927
3928
3929 void os::wait_for_keypress_at_exit(void) {
3930 if (PauseAtExit) {
3931 fprintf(stderr, "Press any key to continue...\n");
3932 fgetc(stdin);
3933 }
3934 }
3935
3936
3937 bool os::message_box(const char* title, const char* message) {
3938 int result = MessageBox(NULL, message, title,
3939 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3940 return result == IDYES;
3941 }
3942
3943 #ifndef PRODUCT
3944 #ifndef _WIN64
3945 // Helpers to check whether NX protection is enabled
3946 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3947 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3948 pex->ExceptionRecord->NumberParameters > 0 &&
3949 pex->ExceptionRecord->ExceptionInformation[0] ==
3950 EXCEPTION_INFO_EXEC_VIOLATION) {
3951 return EXCEPTION_EXECUTE_HANDLER;
3952 }
3953 return EXCEPTION_CONTINUE_SEARCH;
3954 }
3955
3956 void nx_check_protection() {
3957 // If NX is enabled we'll get an exception calling into code on the stack
3958 char code[] = { (char)0xC3 }; // ret
3959 void *code_ptr = (void *)code;
3960 __try {
3961 __asm call code_ptr
3962 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3963 tty->print_raw_cr("NX protection detected.");
3964 }
3965 }
3966 #endif // _WIN64
3967 #endif // PRODUCT
3968
3969 // This is called _before_ the global arguments have been parsed
3970 void os::init(void) {
3971 _initial_pid = _getpid();
3972
3973 init_random(1234567);
3974
3975 win32::initialize_system_info();
3976 win32::setmode_streams();
3977 init_page_sizes((size_t) win32::vm_page_size());
3978
3979 // This may be overridden later when argument processing is done.
3980 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
3981
3982 // Initialize main_process and main_thread
3983 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3984 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3985 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3986 fatal("DuplicateHandle failed\n");
3987 }
3988 main_thread_id = (int) GetCurrentThreadId();
3989
3990 // initialize fast thread access - only used for 32-bit
3991 win32::initialize_thread_ptr_offset();
3992 }
3993
3994 // To install functions for atexit processing
3995 extern "C" {
3996 static void perfMemory_exit_helper() {
3997 perfMemory_exit();
3998 }
3999 }
4000
4001 static jint initSock();
4002
4003 // this is called _after_ the global arguments have been parsed
4004 jint os::init_2(void) {
4005 // Allocate a single page and mark it as readable for safepoint polling
4006 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4007 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4008
4009 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4010 guarantee(return_page != NULL, "Commit Failed for polling page");
4011
4012 os::set_polling_page(polling_page);
4013 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4014
4015 if (!UseMembar) {
4016 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4017 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4018
4019 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4020 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4021
4022 os::set_memory_serialize_page(mem_serialize_page);
4023 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4024 }
4025
4026 // Setup Windows Exceptions
4027
4028 // for debugging float code generation bugs
4029 if (ForceFloatExceptions) {
4030 #ifndef _WIN64
4031 static long fp_control_word = 0;
4032 __asm { fstcw fp_control_word }
4033 // see Intel PPro Manual, Vol. 2, p 7-16
4034 const long precision = 0x20;
4035 const long underflow = 0x10;
4036 const long overflow = 0x08;
4037 const long zero_div = 0x04;
4038 const long denorm = 0x02;
4039 const long invalid = 0x01;
4040 fp_control_word |= invalid;
4041 __asm { fldcw fp_control_word }
4042 #endif
4043 }
4044
4045 // If stack_commit_size is 0, windows will reserve the default size,
4046 // but only commit a small portion of it.
4047 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4048 size_t default_reserve_size = os::win32::default_stack_size();
4049 size_t actual_reserve_size = stack_commit_size;
4050 if (stack_commit_size < default_reserve_size) {
4051 // If stack_commit_size == 0, we want this too
4052 actual_reserve_size = default_reserve_size;
4053 }
4054
4055 // Check minimum allowable stack size for thread creation and to initialize
4056 // the java system classes, including StackOverflowError - depends on page
4057 // size. Add two 4K pages for compiler2 recursion in main thread.
4058 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4059 // class initialization depending on 32 or 64 bit VM.
4060 size_t min_stack_allowed =
4061 (size_t)(JavaThread::stack_guard_zone_size() +
4062 JavaThread::stack_shadow_zone_size() +
4063 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4064
4065 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size());
4066
4067 if (actual_reserve_size < min_stack_allowed) {
4068 tty->print_cr("\nThe Java thread stack size specified is too small. "
4069 "Specify at least %dk",
4070 min_stack_allowed / K);
4071 return JNI_ERR;
4072 }
4073
4074 JavaThread::set_stack_size_at_create(stack_commit_size);
4075
4076 // Calculate theoretical max. size of Threads to guard gainst artifical
4077 // out-of-memory situations, where all available address-space has been
4078 // reserved by thread stacks.
4079 assert(actual_reserve_size != 0, "Must have a stack");
4080
4081 // Calculate the thread limit when we should start doing Virtual Memory
4082 // banging. Currently when the threads will have used all but 200Mb of space.
4083 //
4084 // TODO: consider performing a similar calculation for commit size instead
4085 // as reserve size, since on a 64-bit platform we'll run into that more
4086 // often than running out of virtual memory space. We can use the
4087 // lower value of the two calculations as the os_thread_limit.
4088 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4089 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4090
4091 // at exit methods are called in the reverse order of their registration.
4092 // there is no limit to the number of functions registered. atexit does
4093 // not set errno.
4094
4095 if (PerfAllowAtExitRegistration) {
4096 // only register atexit functions if PerfAllowAtExitRegistration is set.
4097 // atexit functions can be delayed until process exit time, which
4098 // can be problematic for embedded VM situations. Embedded VMs should
4099 // call DestroyJavaVM() to assure that VM resources are released.
4100
4101 // note: perfMemory_exit_helper atexit function may be removed in
4102 // the future if the appropriate cleanup code can be added to the
4103 // VM_Exit VMOperation's doit method.
4104 if (atexit(perfMemory_exit_helper) != 0) {
4105 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4106 }
4107 }
4108
4109 #ifndef _WIN64
4110 // Print something if NX is enabled (win32 on AMD64)
4111 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4112 #endif
4113
4114 // initialize thread priority policy
4115 prio_init();
4116
4117 if (UseNUMA && !ForceNUMA) {
4118 UseNUMA = false; // We don't fully support this yet
4119 }
4120
4121 if (UseNUMAInterleaving) {
4122 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4123 bool success = numa_interleaving_init();
4124 if (!success) UseNUMAInterleaving = false;
4125 }
4126
4127 if (initSock() != JNI_OK) {
4128 return JNI_ERR;
4129 }
4130
4131 return JNI_OK;
4132 }
4133
4134 // Mark the polling page as unreadable
4135 void os::make_polling_page_unreadable(void) {
4136 DWORD old_status;
4137 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4138 PAGE_NOACCESS, &old_status)) {
4139 fatal("Could not disable polling page");
4140 }
4141 }
4142
4143 // Mark the polling page as readable
4144 void os::make_polling_page_readable(void) {
4145 DWORD old_status;
4146 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4147 PAGE_READONLY, &old_status)) {
4148 fatal("Could not enable polling page");
4149 }
4150 }
4151
4152
4153 int os::stat(const char *path, struct stat *sbuf) {
4154 char pathbuf[MAX_PATH];
4155 if (strlen(path) > MAX_PATH - 1) {
4156 errno = ENAMETOOLONG;
4157 return -1;
4158 }
4159 os::native_path(strcpy(pathbuf, path));
4160 int ret = ::stat(pathbuf, sbuf);
4161 if (sbuf != NULL && UseUTCFileTimestamp) {
4162 // Fix for 6539723. st_mtime returned from stat() is dependent on
4163 // the system timezone and so can return different values for the
4164 // same file if/when daylight savings time changes. This adjustment
4165 // makes sure the same timestamp is returned regardless of the TZ.
4166 //
4167 // See:
4168 // http://msdn.microsoft.com/library/
4169 // default.asp?url=/library/en-us/sysinfo/base/
4170 // time_zone_information_str.asp
4171 // and
4172 // http://msdn.microsoft.com/library/default.asp?url=
4173 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4174 //
4175 // NOTE: there is a insidious bug here: If the timezone is changed
4176 // after the call to stat() but before 'GetTimeZoneInformation()', then
4177 // the adjustment we do here will be wrong and we'll return the wrong
4178 // value (which will likely end up creating an invalid class data
4179 // archive). Absent a better API for this, or some time zone locking
4180 // mechanism, we'll have to live with this risk.
4181 TIME_ZONE_INFORMATION tz;
4182 DWORD tzid = GetTimeZoneInformation(&tz);
4183 int daylightBias =
4184 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4185 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4186 }
4187 return ret;
4188 }
4189
4190
4191 #define FT2INT64(ft) \
4192 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4193
4194
4195 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4196 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4197 // of a thread.
4198 //
4199 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4200 // the fast estimate available on the platform.
4201
4202 // current_thread_cpu_time() is not optimized for Windows yet
4203 jlong os::current_thread_cpu_time() {
4204 // return user + sys since the cost is the same
4205 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4206 }
4207
4208 jlong os::thread_cpu_time(Thread* thread) {
4209 // consistent with what current_thread_cpu_time() returns.
4210 return os::thread_cpu_time(thread, true /* user+sys */);
4211 }
4212
4213 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4214 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4215 }
4216
4217 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4218 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4219 // If this function changes, os::is_thread_cpu_time_supported() should too
4220 FILETIME CreationTime;
4221 FILETIME ExitTime;
4222 FILETIME KernelTime;
4223 FILETIME UserTime;
4224
4225 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4226 &ExitTime, &KernelTime, &UserTime) == 0) {
4227 return -1;
4228 } else if (user_sys_cpu_time) {
4229 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4230 } else {
4231 return FT2INT64(UserTime) * 100;
4232 }
4233 }
4234
4235 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4236 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4237 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4238 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4239 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4240 }
4241
4242 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4243 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4244 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4245 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4246 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4247 }
4248
4249 bool os::is_thread_cpu_time_supported() {
4250 // see os::thread_cpu_time
4251 FILETIME CreationTime;
4252 FILETIME ExitTime;
4253 FILETIME KernelTime;
4254 FILETIME UserTime;
4255
4256 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4257 &KernelTime, &UserTime) == 0) {
4258 return false;
4259 } else {
4260 return true;
4261 }
4262 }
4263
4264 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4265 // It does have primitives (PDH API) to get CPU usage and run queue length.
4266 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4267 // If we wanted to implement loadavg on Windows, we have a few options:
4268 //
4269 // a) Query CPU usage and run queue length and "fake" an answer by
4270 // returning the CPU usage if it's under 100%, and the run queue
4271 // length otherwise. It turns out that querying is pretty slow
4272 // on Windows, on the order of 200 microseconds on a fast machine.
4273 // Note that on the Windows the CPU usage value is the % usage
4274 // since the last time the API was called (and the first call
4275 // returns 100%), so we'd have to deal with that as well.
4276 //
4277 // b) Sample the "fake" answer using a sampling thread and store
4278 // the answer in a global variable. The call to loadavg would
4279 // just return the value of the global, avoiding the slow query.
4280 //
4281 // c) Sample a better answer using exponential decay to smooth the
4282 // value. This is basically the algorithm used by UNIX kernels.
4283 //
4284 // Note that sampling thread starvation could affect both (b) and (c).
4285 int os::loadavg(double loadavg[], int nelem) {
4286 return -1;
4287 }
4288
4289
4290 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4291 bool os::dont_yield() {
4292 return DontYieldALot;
4293 }
4294
4295 // This method is a slightly reworked copy of JDK's sysOpen
4296 // from src/windows/hpi/src/sys_api_md.c
4297
4298 int os::open(const char *path, int oflag, int mode) {
4299 char pathbuf[MAX_PATH];
4300
4301 if (strlen(path) > MAX_PATH - 1) {
4302 errno = ENAMETOOLONG;
4303 return -1;
4304 }
4305 os::native_path(strcpy(pathbuf, path));
4306 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4307 }
4308
4309 FILE* os::open(int fd, const char* mode) {
4310 return ::_fdopen(fd, mode);
4311 }
4312
4313 // Is a (classpath) directory empty?
4314 bool os::dir_is_empty(const char* path) {
4315 WIN32_FIND_DATA fd;
4316 HANDLE f = FindFirstFile(path, &fd);
4317 if (f == INVALID_HANDLE_VALUE) {
4318 return true;
4319 }
4320 FindClose(f);
4321 return false;
4322 }
4323
4324 // create binary file, rewriting existing file if required
4325 int os::create_binary_file(const char* path, bool rewrite_existing) {
4326 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4327 if (!rewrite_existing) {
4328 oflags |= _O_EXCL;
4329 }
4330 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4331 }
4332
4333 // return current position of file pointer
4334 jlong os::current_file_offset(int fd) {
4335 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4336 }
4337
4338 // move file pointer to the specified offset
4339 jlong os::seek_to_file_offset(int fd, jlong offset) {
4340 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4341 }
4342
4343
4344 jlong os::lseek(int fd, jlong offset, int whence) {
4345 return (jlong) ::_lseeki64(fd, offset, whence);
4346 }
4347
4348 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4349 OVERLAPPED ov;
4350 DWORD nread;
4351 BOOL result;
4352
4353 ZeroMemory(&ov, sizeof(ov));
4354 ov.Offset = (DWORD)offset;
4355 ov.OffsetHigh = (DWORD)(offset >> 32);
4356
4357 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4358
4359 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4360
4361 return result ? nread : 0;
4362 }
4363
4364
4365 // This method is a slightly reworked copy of JDK's sysNativePath
4366 // from src/windows/hpi/src/path_md.c
4367
4368 // Convert a pathname to native format. On win32, this involves forcing all
4369 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4370 // sometimes rejects '/') and removing redundant separators. The input path is
4371 // assumed to have been converted into the character encoding used by the local
4372 // system. Because this might be a double-byte encoding, care is taken to
4373 // treat double-byte lead characters correctly.
4374 //
4375 // This procedure modifies the given path in place, as the result is never
4376 // longer than the original. There is no error return; this operation always
4377 // succeeds.
4378 char * os::native_path(char *path) {
4379 char *src = path, *dst = path, *end = path;
4380 char *colon = NULL; // If a drive specifier is found, this will
4381 // point to the colon following the drive letter
4382
4383 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4384 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4385 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4386
4387 // Check for leading separators
4388 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4389 while (isfilesep(*src)) {
4390 src++;
4391 }
4392
4393 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4394 // Remove leading separators if followed by drive specifier. This
4395 // hack is necessary to support file URLs containing drive
4396 // specifiers (e.g., "file://c:/path"). As a side effect,
4397 // "/c:/path" can be used as an alternative to "c:/path".
4398 *dst++ = *src++;
4399 colon = dst;
4400 *dst++ = ':';
4401 src++;
4402 } else {
4403 src = path;
4404 if (isfilesep(src[0]) && isfilesep(src[1])) {
4405 // UNC pathname: Retain first separator; leave src pointed at
4406 // second separator so that further separators will be collapsed
4407 // into the second separator. The result will be a pathname
4408 // beginning with "\\\\" followed (most likely) by a host name.
4409 src = dst = path + 1;
4410 path[0] = '\\'; // Force first separator to '\\'
4411 }
4412 }
4413
4414 end = dst;
4415
4416 // Remove redundant separators from remainder of path, forcing all
4417 // separators to be '\\' rather than '/'. Also, single byte space
4418 // characters are removed from the end of the path because those
4419 // are not legal ending characters on this operating system.
4420 //
4421 while (*src != '\0') {
4422 if (isfilesep(*src)) {
4423 *dst++ = '\\'; src++;
4424 while (isfilesep(*src)) src++;
4425 if (*src == '\0') {
4426 // Check for trailing separator
4427 end = dst;
4428 if (colon == dst - 2) break; // "z:\\"
4429 if (dst == path + 1) break; // "\\"
4430 if (dst == path + 2 && isfilesep(path[0])) {
4431 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4432 // beginning of a UNC pathname. Even though it is not, by
4433 // itself, a valid UNC pathname, we leave it as is in order
4434 // to be consistent with the path canonicalizer as well
4435 // as the win32 APIs, which treat this case as an invalid
4436 // UNC pathname rather than as an alias for the root
4437 // directory of the current drive.
4438 break;
4439 }
4440 end = --dst; // Path does not denote a root directory, so
4441 // remove trailing separator
4442 break;
4443 }
4444 end = dst;
4445 } else {
4446 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4447 *dst++ = *src++;
4448 if (*src) *dst++ = *src++;
4449 end = dst;
4450 } else { // Copy a single-byte character
4451 char c = *src++;
4452 *dst++ = c;
4453 // Space is not a legal ending character
4454 if (c != ' ') end = dst;
4455 }
4456 }
4457 }
4458
4459 *end = '\0';
4460
4461 // For "z:", add "." to work around a bug in the C runtime library
4462 if (colon == dst - 1) {
4463 path[2] = '.';
4464 path[3] = '\0';
4465 }
4466
4467 return path;
4468 }
4469
4470 // This code is a copy of JDK's sysSetLength
4471 // from src/windows/hpi/src/sys_api_md.c
4472
4473 int os::ftruncate(int fd, jlong length) {
4474 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4475 long high = (long)(length >> 32);
4476 DWORD ret;
4477
4478 if (h == (HANDLE)(-1)) {
4479 return -1;
4480 }
4481
4482 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4483 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4484 return -1;
4485 }
4486
4487 if (::SetEndOfFile(h) == FALSE) {
4488 return -1;
4489 }
4490
4491 return 0;
4492 }
4493
4494 int os::get_fileno(FILE* fp) {
4495 return _fileno(fp);
4496 }
4497
4498 // This code is a copy of JDK's sysSync
4499 // from src/windows/hpi/src/sys_api_md.c
4500 // except for the legacy workaround for a bug in Win 98
4501
4502 int os::fsync(int fd) {
4503 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4504
4505 if ((!::FlushFileBuffers(handle)) &&
4506 (GetLastError() != ERROR_ACCESS_DENIED)) {
4507 // from winerror.h
4508 return -1;
4509 }
4510 return 0;
4511 }
4512
4513 static int nonSeekAvailable(int, long *);
4514 static int stdinAvailable(int, long *);
4515
4516 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4517 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4518
4519 // This code is a copy of JDK's sysAvailable
4520 // from src/windows/hpi/src/sys_api_md.c
4521
4522 int os::available(int fd, jlong *bytes) {
4523 jlong cur, end;
4524 struct _stati64 stbuf64;
4525
4526 if (::_fstati64(fd, &stbuf64) >= 0) {
4527 int mode = stbuf64.st_mode;
4528 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4529 int ret;
4530 long lpbytes;
4531 if (fd == 0) {
4532 ret = stdinAvailable(fd, &lpbytes);
4533 } else {
4534 ret = nonSeekAvailable(fd, &lpbytes);
4535 }
4536 (*bytes) = (jlong)(lpbytes);
4537 return ret;
4538 }
4539 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4540 return FALSE;
4541 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4542 return FALSE;
4543 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4544 return FALSE;
4545 }
4546 *bytes = end - cur;
4547 return TRUE;
4548 } else {
4549 return FALSE;
4550 }
4551 }
4552
4553 void os::flockfile(FILE* fp) {
4554 _lock_file(fp);
4555 }
4556
4557 void os::funlockfile(FILE* fp) {
4558 _unlock_file(fp);
4559 }
4560
4561 // This code is a copy of JDK's nonSeekAvailable
4562 // from src/windows/hpi/src/sys_api_md.c
4563
4564 static int nonSeekAvailable(int fd, long *pbytes) {
4565 // This is used for available on non-seekable devices
4566 // (like both named and anonymous pipes, such as pipes
4567 // connected to an exec'd process).
4568 // Standard Input is a special case.
4569 HANDLE han;
4570
4571 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4572 return FALSE;
4573 }
4574
4575 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4576 // PeekNamedPipe fails when at EOF. In that case we
4577 // simply make *pbytes = 0 which is consistent with the
4578 // behavior we get on Solaris when an fd is at EOF.
4579 // The only alternative is to raise an Exception,
4580 // which isn't really warranted.
4581 //
4582 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4583 return FALSE;
4584 }
4585 *pbytes = 0;
4586 }
4587 return TRUE;
4588 }
4589
4590 #define MAX_INPUT_EVENTS 2000
4591
4592 // This code is a copy of JDK's stdinAvailable
4593 // from src/windows/hpi/src/sys_api_md.c
4594
4595 static int stdinAvailable(int fd, long *pbytes) {
4596 HANDLE han;
4597 DWORD numEventsRead = 0; // Number of events read from buffer
4598 DWORD numEvents = 0; // Number of events in buffer
4599 DWORD i = 0; // Loop index
4600 DWORD curLength = 0; // Position marker
4601 DWORD actualLength = 0; // Number of bytes readable
4602 BOOL error = FALSE; // Error holder
4603 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4604
4605 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4606 return FALSE;
4607 }
4608
4609 // Construct an array of input records in the console buffer
4610 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4611 if (error == 0) {
4612 return nonSeekAvailable(fd, pbytes);
4613 }
4614
4615 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4616 if (numEvents > MAX_INPUT_EVENTS) {
4617 numEvents = MAX_INPUT_EVENTS;
4618 }
4619
4620 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4621 if (lpBuffer == NULL) {
4622 return FALSE;
4623 }
4624
4625 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4626 if (error == 0) {
4627 os::free(lpBuffer);
4628 return FALSE;
4629 }
4630
4631 // Examine input records for the number of bytes available
4632 for (i=0; i<numEvents; i++) {
4633 if (lpBuffer[i].EventType == KEY_EVENT) {
4634
4635 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4636 &(lpBuffer[i].Event);
4637 if (keyRecord->bKeyDown == TRUE) {
4638 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4639 curLength++;
4640 if (*keyPressed == '\r') {
4641 actualLength = curLength;
4642 }
4643 }
4644 }
4645 }
4646
4647 if (lpBuffer != NULL) {
4648 os::free(lpBuffer);
4649 }
4650
4651 *pbytes = (long) actualLength;
4652 return TRUE;
4653 }
4654
4655 // Map a block of memory.
4656 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4657 char *addr, size_t bytes, bool read_only,
4658 bool allow_exec) {
4659 HANDLE hFile;
4660 char* base;
4661
4662 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4663 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4664 if (hFile == NULL) {
4665 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4666 return NULL;
4667 }
4668
4669 if (allow_exec) {
4670 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4671 // unless it comes from a PE image (which the shared archive is not.)
4672 // Even VirtualProtect refuses to give execute access to mapped memory
4673 // that was not previously executable.
4674 //
4675 // Instead, stick the executable region in anonymous memory. Yuck.
4676 // Penalty is that ~4 pages will not be shareable - in the future
4677 // we might consider DLLizing the shared archive with a proper PE
4678 // header so that mapping executable + sharing is possible.
4679
4680 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4681 PAGE_READWRITE);
4682 if (base == NULL) {
4683 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4684 CloseHandle(hFile);
4685 return NULL;
4686 }
4687
4688 DWORD bytes_read;
4689 OVERLAPPED overlapped;
4690 overlapped.Offset = (DWORD)file_offset;
4691 overlapped.OffsetHigh = 0;
4692 overlapped.hEvent = NULL;
4693 // ReadFile guarantees that if the return value is true, the requested
4694 // number of bytes were read before returning.
4695 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4696 if (!res) {
4697 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4698 release_memory(base, bytes);
4699 CloseHandle(hFile);
4700 return NULL;
4701 }
4702 } else {
4703 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4704 NULL /* file_name */);
4705 if (hMap == NULL) {
4706 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4707 CloseHandle(hFile);
4708 return NULL;
4709 }
4710
4711 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4712 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4713 (DWORD)bytes, addr);
4714 if (base == NULL) {
4715 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4716 CloseHandle(hMap);
4717 CloseHandle(hFile);
4718 return NULL;
4719 }
4720
4721 if (CloseHandle(hMap) == 0) {
4722 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4723 CloseHandle(hFile);
4724 return base;
4725 }
4726 }
4727
4728 if (allow_exec) {
4729 DWORD old_protect;
4730 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4731 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4732
4733 if (!res) {
4734 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4735 // Don't consider this a hard error, on IA32 even if the
4736 // VirtualProtect fails, we should still be able to execute
4737 CloseHandle(hFile);
4738 return base;
4739 }
4740 }
4741
4742 if (CloseHandle(hFile) == 0) {
4743 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4744 return base;
4745 }
4746
4747 return base;
4748 }
4749
4750
4751 // Remap a block of memory.
4752 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4753 char *addr, size_t bytes, bool read_only,
4754 bool allow_exec) {
4755 // This OS does not allow existing memory maps to be remapped so we
4756 // have to unmap the memory before we remap it.
4757 if (!os::unmap_memory(addr, bytes)) {
4758 return NULL;
4759 }
4760
4761 // There is a very small theoretical window between the unmap_memory()
4762 // call above and the map_memory() call below where a thread in native
4763 // code may be able to access an address that is no longer mapped.
4764
4765 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4766 read_only, allow_exec);
4767 }
4768
4769
4770 // Unmap a block of memory.
4771 // Returns true=success, otherwise false.
4772
4773 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4774 MEMORY_BASIC_INFORMATION mem_info;
4775 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4776 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4777 return false;
4778 }
4779
4780 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4781 // Instead, executable region was allocated using VirtualAlloc(). See
4782 // pd_map_memory() above.
4783 //
4784 // The following flags should match the 'exec_access' flages used for
4785 // VirtualProtect() in pd_map_memory().
4786 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4787 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4788 return pd_release_memory(addr, bytes);
4789 }
4790
4791 BOOL result = UnmapViewOfFile(addr);
4792 if (result == 0) {
4793 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4794 return false;
4795 }
4796 return true;
4797 }
4798
4799 void os::pause() {
4800 char filename[MAX_PATH];
4801 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4802 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4803 } else {
4804 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4805 }
4806
4807 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4808 if (fd != -1) {
4809 struct stat buf;
4810 ::close(fd);
4811 while (::stat(filename, &buf) == 0) {
4812 Sleep(100);
4813 }
4814 } else {
4815 jio_fprintf(stderr,
4816 "Could not open pause file '%s', continuing immediately.\n", filename);
4817 }
4818 }
4819
4820 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4821 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4822 }
4823
4824 // See the caveats for this class in os_windows.hpp
4825 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4826 // into this method and returns false. If no OS EXCEPTION was raised, returns
4827 // true.
4828 // The callback is supposed to provide the method that should be protected.
4829 //
4830 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4831 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4832 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4833 "crash_protection already set?");
4834
4835 bool success = true;
4836 __try {
4837 WatcherThread::watcher_thread()->set_crash_protection(this);
4838 cb.call();
4839 } __except(EXCEPTION_EXECUTE_HANDLER) {
4840 // only for protection, nothing to do
4841 success = false;
4842 }
4843 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4844 return success;
4845 }
4846
4847 // An Event wraps a win32 "CreateEvent" kernel handle.
4848 //
4849 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4850 //
4851 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4852 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4853 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4854 // In addition, an unpark() operation might fetch the handle field, but the
4855 // event could recycle between the fetch and the SetEvent() operation.
4856 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4857 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4858 // on an stale but recycled handle would be harmless, but in practice this might
4859 // confuse other non-Sun code, so it's not a viable approach.
4860 //
4861 // 2: Once a win32 event handle is associated with an Event, it remains associated
4862 // with the Event. The event handle is never closed. This could be construed
4863 // as handle leakage, but only up to the maximum # of threads that have been extant
4864 // at any one time. This shouldn't be an issue, as windows platforms typically
4865 // permit a process to have hundreds of thousands of open handles.
4866 //
4867 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4868 // and release unused handles.
4869 //
4870 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4871 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4872 //
4873 // 5. Use an RCU-like mechanism (Read-Copy Update).
4874 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4875 //
4876 // We use (2).
4877 //
4878 // TODO-FIXME:
4879 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4880 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4881 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4882 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4883 // into a single win32 CreateEvent() handle.
4884 //
4885 // Assumption:
4886 // Only one parker can exist on an event, which is why we allocate
4887 // them per-thread. Multiple unparkers can coexist.
4888 //
4889 // _Event transitions in park()
4890 // -1 => -1 : illegal
4891 // 1 => 0 : pass - return immediately
4892 // 0 => -1 : block; then set _Event to 0 before returning
4893 //
4894 // _Event transitions in unpark()
4895 // 0 => 1 : just return
4896 // 1 => 1 : just return
4897 // -1 => either 0 or 1; must signal target thread
4898 // That is, we can safely transition _Event from -1 to either
4899 // 0 or 1.
4900 //
4901 // _Event serves as a restricted-range semaphore.
4902 // -1 : thread is blocked, i.e. there is a waiter
4903 // 0 : neutral: thread is running or ready,
4904 // could have been signaled after a wait started
4905 // 1 : signaled - thread is running or ready
4906 //
4907 // Another possible encoding of _Event would be with
4908 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4909 //
4910
4911 int os::PlatformEvent::park(jlong Millis) {
4912 // Transitions for _Event:
4913 // -1 => -1 : illegal
4914 // 1 => 0 : pass - return immediately
4915 // 0 => -1 : block; then set _Event to 0 before returning
4916
4917 guarantee(_ParkHandle != NULL , "Invariant");
4918 guarantee(Millis > 0 , "Invariant");
4919
4920 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4921 // the initial park() operation.
4922 // Consider: use atomic decrement instead of CAS-loop
4923
4924 int v;
4925 for (;;) {
4926 v = _Event;
4927 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4928 }
4929 guarantee((v == 0) || (v == 1), "invariant");
4930 if (v != 0) return OS_OK;
4931
4932 // Do this the hard way by blocking ...
4933 // TODO: consider a brief spin here, gated on the success of recent
4934 // spin attempts by this thread.
4935 //
4936 // We decompose long timeouts into series of shorter timed waits.
4937 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4938 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4939 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4940 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4941 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4942 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4943 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4944 // for the already waited time. This policy does not admit any new outcomes.
4945 // In the future, however, we might want to track the accumulated wait time and
4946 // adjust Millis accordingly if we encounter a spurious wakeup.
4947
4948 const int MAXTIMEOUT = 0x10000000;
4949 DWORD rv = WAIT_TIMEOUT;
4950 while (_Event < 0 && Millis > 0) {
4951 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
4952 if (Millis > MAXTIMEOUT) {
4953 prd = MAXTIMEOUT;
4954 }
4955 rv = ::WaitForSingleObject(_ParkHandle, prd);
4956 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
4957 if (rv == WAIT_TIMEOUT) {
4958 Millis -= prd;
4959 }
4960 }
4961 v = _Event;
4962 _Event = 0;
4963 // see comment at end of os::PlatformEvent::park() below:
4964 OrderAccess::fence();
4965 // If we encounter a nearly simultanous timeout expiry and unpark()
4966 // we return OS_OK indicating we awoke via unpark().
4967 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4968 return (v >= 0) ? OS_OK : OS_TIMEOUT;
4969 }
4970
4971 void os::PlatformEvent::park() {
4972 // Transitions for _Event:
4973 // -1 => -1 : illegal
4974 // 1 => 0 : pass - return immediately
4975 // 0 => -1 : block; then set _Event to 0 before returning
4976
4977 guarantee(_ParkHandle != NULL, "Invariant");
4978 // Invariant: Only the thread associated with the Event/PlatformEvent
4979 // may call park().
4980 // Consider: use atomic decrement instead of CAS-loop
4981 int v;
4982 for (;;) {
4983 v = _Event;
4984 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4985 }
4986 guarantee((v == 0) || (v == 1), "invariant");
4987 if (v != 0) return;
4988
4989 // Do this the hard way by blocking ...
4990 // TODO: consider a brief spin here, gated on the success of recent
4991 // spin attempts by this thread.
4992 while (_Event < 0) {
4993 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
4994 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
4995 }
4996
4997 // Usually we'll find _Event == 0 at this point, but as
4998 // an optional optimization we clear it, just in case can
4999 // multiple unpark() operations drove _Event up to 1.
5000 _Event = 0;
5001 OrderAccess::fence();
5002 guarantee(_Event >= 0, "invariant");
5003 }
5004
5005 void os::PlatformEvent::unpark() {
5006 guarantee(_ParkHandle != NULL, "Invariant");
5007
5008 // Transitions for _Event:
5009 // 0 => 1 : just return
5010 // 1 => 1 : just return
5011 // -1 => either 0 or 1; must signal target thread
5012 // That is, we can safely transition _Event from -1 to either
5013 // 0 or 1.
5014 // See also: "Semaphores in Plan 9" by Mullender & Cox
5015 //
5016 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5017 // that it will take two back-to-back park() calls for the owning
5018 // thread to block. This has the benefit of forcing a spurious return
5019 // from the first park() call after an unpark() call which will help
5020 // shake out uses of park() and unpark() without condition variables.
5021
5022 if (Atomic::xchg(1, &_Event) >= 0) return;
5023
5024 ::SetEvent(_ParkHandle);
5025 }
5026
5027
5028 // JSR166
5029 // -------------------------------------------------------
5030
5031 // The Windows implementation of Park is very straightforward: Basic
5032 // operations on Win32 Events turn out to have the right semantics to
5033 // use them directly. We opportunistically resuse the event inherited
5034 // from Monitor.
5035
5036 void Parker::park(bool isAbsolute, jlong time) {
5037 guarantee(_ParkEvent != NULL, "invariant");
5038 // First, demultiplex/decode time arguments
5039 if (time < 0) { // don't wait
5040 return;
5041 } else if (time == 0 && !isAbsolute) {
5042 time = INFINITE;
5043 } else if (isAbsolute) {
5044 time -= os::javaTimeMillis(); // convert to relative time
5045 if (time <= 0) { // already elapsed
5046 return;
5047 }
5048 } else { // relative
5049 time /= 1000000; // Must coarsen from nanos to millis
5050 if (time == 0) { // Wait for the minimal time unit if zero
5051 time = 1;
5052 }
5053 }
5054
5055 JavaThread* thread = JavaThread::current();
5056
5057 // Don't wait if interrupted or already triggered
5058 if (Thread::is_interrupted(thread, false) ||
5059 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5060 ResetEvent(_ParkEvent);
5061 return;
5062 } else {
5063 ThreadBlockInVM tbivm(thread);
5064 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5065 thread->set_suspend_equivalent();
5066
5067 WaitForSingleObject(_ParkEvent, time);
5068 ResetEvent(_ParkEvent);
5069
5070 // If externally suspended while waiting, re-suspend
5071 if (thread->handle_special_suspend_equivalent_condition()) {
5072 thread->java_suspend_self();
5073 }
5074 }
5075 }
5076
5077 void Parker::unpark() {
5078 guarantee(_ParkEvent != NULL, "invariant");
5079 SetEvent(_ParkEvent);
5080 }
5081
5082 // Run the specified command in a separate process. Return its exit value,
5083 // or -1 on failure (e.g. can't create a new process).
5084 int os::fork_and_exec(char* cmd) {
5085 STARTUPINFO si;
5086 PROCESS_INFORMATION pi;
5087 DWORD exit_code;
5088
5089 char * cmd_string;
5090 char * cmd_prefix = "cmd /C ";
5091 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5092 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5093 if (cmd_string == NULL) {
5094 return -1;
5095 }
5096 cmd_string[0] = '\0';
5097 strcat(cmd_string, cmd_prefix);
5098 strcat(cmd_string, cmd);
5099
5100 // now replace all '\n' with '&'
5101 char * substring = cmd_string;
5102 while ((substring = strchr(substring, '\n')) != NULL) {
5103 substring[0] = '&';
5104 substring++;
5105 }
5106 memset(&si, 0, sizeof(si));
5107 si.cb = sizeof(si);
5108 memset(&pi, 0, sizeof(pi));
5109 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5110 cmd_string, // command line
5111 NULL, // process security attribute
5112 NULL, // thread security attribute
5113 TRUE, // inherits system handles
5114 0, // no creation flags
5115 NULL, // use parent's environment block
5116 NULL, // use parent's starting directory
5117 &si, // (in) startup information
5118 &pi); // (out) process information
5119
5120 if (rslt) {
5121 // Wait until child process exits.
5122 WaitForSingleObject(pi.hProcess, INFINITE);
5123
5124 GetExitCodeProcess(pi.hProcess, &exit_code);
5125
5126 // Close process and thread handles.
5127 CloseHandle(pi.hProcess);
5128 CloseHandle(pi.hThread);
5129 } else {
5130 exit_code = -1;
5131 }
5132
5133 FREE_C_HEAP_ARRAY(char, cmd_string);
5134 return (int)exit_code;
5135 }
5136
5137 bool os::find(address addr, outputStream* st) {
5138 int offset = -1;
5139 bool result = false;
5140 char buf[256];
5141 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5142 st->print(PTR_FORMAT " ", addr);
5143 if (strlen(buf) < sizeof(buf) - 1) {
5144 char* p = strrchr(buf, '\\');
5145 if (p) {
5146 st->print("%s", p + 1);
5147 } else {
5148 st->print("%s", buf);
5149 }
5150 } else {
5151 // The library name is probably truncated. Let's omit the library name.
5152 // See also JDK-8147512.
5153 }
5154 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5155 st->print("::%s + 0x%x", buf, offset);
5156 }
5157 st->cr();
5158 result = true;
5159 }
5160 return result;
5161 }
5162
5163 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5164 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5165
5166 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5167 JavaThread* thread = JavaThread::current();
5168 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5169 address addr = (address) exceptionRecord->ExceptionInformation[1];
5170
5171 if (os::is_memory_serialize_page(thread, addr)) {
5172 return EXCEPTION_CONTINUE_EXECUTION;
5173 }
5174 }
5175
5176 return EXCEPTION_CONTINUE_SEARCH;
5177 }
5178
5179 // We don't build a headless jre for Windows
5180 bool os::is_headless_jre() { return false; }
5181
5182 static jint initSock() {
5183 WSADATA wsadata;
5184
5185 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5186 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5187 ::GetLastError());
5188 return JNI_ERR;
5189 }
5190 return JNI_OK;
5191 }
5192
5193 struct hostent* os::get_host_by_name(char* name) {
5194 return (struct hostent*)gethostbyname(name);
5195 }
5196
5197 int os::socket_close(int fd) {
5198 return ::closesocket(fd);
5199 }
5200
5201 int os::socket(int domain, int type, int protocol) {
5202 return ::socket(domain, type, protocol);
5203 }
5204
5205 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5206 return ::connect(fd, him, len);
5207 }
5208
5209 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5210 return ::recv(fd, buf, (int)nBytes, flags);
5211 }
5212
5213 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5214 return ::send(fd, buf, (int)nBytes, flags);
5215 }
5216
5217 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5218 return ::send(fd, buf, (int)nBytes, flags);
5219 }
5220
5221 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5222 #if defined(IA32)
5223 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5224 #elif defined (AMD64)
5225 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5226 #endif
5227
5228 // returns true if thread could be suspended,
5229 // false otherwise
5230 static bool do_suspend(HANDLE* h) {
5231 if (h != NULL) {
5232 if (SuspendThread(*h) != ~0) {
5233 return true;
5234 }
5235 }
5236 return false;
5237 }
5238
5239 // resume the thread
5240 // calling resume on an active thread is a no-op
5241 static void do_resume(HANDLE* h) {
5242 if (h != NULL) {
5243 ResumeThread(*h);
5244 }
5245 }
5246
5247 // retrieve a suspend/resume context capable handle
5248 // from the tid. Caller validates handle return value.
5249 void get_thread_handle_for_extended_context(HANDLE* h,
5250 OSThread::thread_id_t tid) {
5251 if (h != NULL) {
5252 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5253 }
5254 }
5255
5256 // Thread sampling implementation
5257 //
5258 void os::SuspendedThreadTask::internal_do_task() {
5259 CONTEXT ctxt;
5260 HANDLE h = NULL;
5261
5262 // get context capable handle for thread
5263 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5264
5265 // sanity
5266 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5267 return;
5268 }
5269
5270 // suspend the thread
5271 if (do_suspend(&h)) {
5272 ctxt.ContextFlags = sampling_context_flags;
5273 // get thread context
5274 GetThreadContext(h, &ctxt);
5275 SuspendedThreadTaskContext context(_thread, &ctxt);
5276 // pass context to Thread Sampling impl
5277 do_task(context);
5278 // resume thread
5279 do_resume(&h);
5280 }
5281
5282 // close handle
5283 CloseHandle(h);
5284 }
5285
5286 bool os::start_debugging(char *buf, int buflen) {
5287 int len = (int)strlen(buf);
5288 char *p = &buf[len];
5289
5290 jio_snprintf(p, buflen-len,
5291 "\n\n"
5292 "Do you want to debug the problem?\n\n"
5293 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5294 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5295 "Otherwise, select 'No' to abort...",
5296 os::current_process_id(), os::current_thread_id());
5297
5298 bool yes = os::message_box("Unexpected Error", buf);
5299
5300 if (yes) {
5301 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5302 // exception. If VM is running inside a debugger, the debugger will
5303 // catch the exception. Otherwise, the breakpoint exception will reach
5304 // the default windows exception handler, which can spawn a debugger and
5305 // automatically attach to the dying VM.
5306 os::breakpoint();
5307 yes = false;
5308 }
5309 return yes;
5310 }
5311
5312 void* os::get_default_process_handle() {
5313 return (void*)GetModuleHandle(NULL);
5314 }
5315
5316 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5317 // which is used to find statically linked in agents.
5318 // Additionally for windows, takes into account __stdcall names.
5319 // Parameters:
5320 // sym_name: Symbol in library we are looking for
5321 // lib_name: Name of library to look in, NULL for shared libs.
5322 // is_absolute_path == true if lib_name is absolute path to agent
5323 // such as "C:/a/b/L.dll"
5324 // == false if only the base name of the library is passed in
5325 // such as "L"
5326 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5327 bool is_absolute_path) {
5328 char *agent_entry_name;
5329 size_t len;
5330 size_t name_len;
5331 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5332 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5333 const char *start;
5334
5335 if (lib_name != NULL) {
5336 len = name_len = strlen(lib_name);
5337 if (is_absolute_path) {
5338 // Need to strip path, prefix and suffix
5339 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5340 lib_name = ++start;
5341 } else {
5342 // Need to check for drive prefix
5343 if ((start = strchr(lib_name, ':')) != NULL) {
5344 lib_name = ++start;
5345 }
5346 }
5347 if (len <= (prefix_len + suffix_len)) {
5348 return NULL;
5349 }
5350 lib_name += prefix_len;
5351 name_len = strlen(lib_name) - suffix_len;
5352 }
5353 }
5354 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5355 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5356 if (agent_entry_name == NULL) {
5357 return NULL;
5358 }
5359 if (lib_name != NULL) {
5360 const char *p = strrchr(sym_name, '@');
5361 if (p != NULL && p != sym_name) {
5362 // sym_name == _Agent_OnLoad@XX
5363 strncpy(agent_entry_name, sym_name, (p - sym_name));
5364 agent_entry_name[(p-sym_name)] = '\0';
5365 // agent_entry_name == _Agent_OnLoad
5366 strcat(agent_entry_name, "_");
5367 strncat(agent_entry_name, lib_name, name_len);
5368 strcat(agent_entry_name, p);
5369 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5370 } else {
5371 strcpy(agent_entry_name, sym_name);
5372 strcat(agent_entry_name, "_");
5373 strncat(agent_entry_name, lib_name, name_len);
5374 }
5375 } else {
5376 strcpy(agent_entry_name, sym_name);
5377 }
5378 return agent_entry_name;
5379 }
5380
5381 #ifndef PRODUCT
5382
5383 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5384 // contiguous memory block at a particular address.
5385 // The test first tries to find a good approximate address to allocate at by using the same
5386 // method to allocate some memory at any address. The test then tries to allocate memory in
5387 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5388 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5389 // the previously allocated memory is available for allocation. The only actual failure
5390 // that is reported is when the test tries to allocate at a particular location but gets a
5391 // different valid one. A NULL return value at this point is not considered an error but may
5392 // be legitimate.
5393 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5394 void TestReserveMemorySpecial_test() {
5395 if (!UseLargePages) {
5396 if (VerboseInternalVMTests) {
5397 tty->print("Skipping test because large pages are disabled");
5398 }
5399 return;
5400 }
5401 // save current value of globals
5402 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5403 bool old_use_numa_interleaving = UseNUMAInterleaving;
5404
5405 // set globals to make sure we hit the correct code path
5406 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5407
5408 // do an allocation at an address selected by the OS to get a good one.
5409 const size_t large_allocation_size = os::large_page_size() * 4;
5410 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5411 if (result == NULL) {
5412 if (VerboseInternalVMTests) {
5413 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5414 large_allocation_size);
5415 }
5416 } else {
5417 os::release_memory_special(result, large_allocation_size);
5418
5419 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5420 // we managed to get it once.
5421 const size_t expected_allocation_size = os::large_page_size();
5422 char* expected_location = result + os::large_page_size();
5423 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5424 if (actual_location == NULL) {
5425 if (VerboseInternalVMTests) {
5426 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5427 expected_location, large_allocation_size);
5428 }
5429 } else {
5430 // release memory
5431 os::release_memory_special(actual_location, expected_allocation_size);
5432 // only now check, after releasing any memory to avoid any leaks.
5433 assert(actual_location == expected_location,
5434 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5435 expected_location, expected_allocation_size, actual_location);
5436 }
5437 }
5438
5439 // restore globals
5440 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5441 UseNUMAInterleaving = old_use_numa_interleaving;
5442 }
5443 #endif // PRODUCT
5444
5445 /*
5446 All the defined signal names for Windows.
5447
5448 NOTE that not all of these names are accepted by FindSignal!
5449
5450 For various reasons some of these may be rejected at runtime.
5451
5452 Here are the names currently accepted by a user of sun.misc.Signal with
5453 1.4.1 (ignoring potential interaction with use of chaining, etc):
5454
5455 (LIST TBD)
5456
5457 */
5458 int os::get_signal_number(const char* name) {
5459 static const struct {
5460 char* name;
5461 int number;
5462 } siglabels [] =
5463 // derived from version 6.0 VC98/include/signal.h
5464 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5465 "FPE", SIGFPE, // floating point exception
5466 "SEGV", SIGSEGV, // segment violation
5467 "INT", SIGINT, // interrupt
5468 "TERM", SIGTERM, // software term signal from kill
5469 "BREAK", SIGBREAK, // Ctrl-Break sequence
5470 "ILL", SIGILL}; // illegal instruction
5471 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5472 if (strcmp(name, siglabels[i].name) == 0) {
5473 return siglabels[i].number;
5474 }
5475 }
5476 return -1;
5477 }
5478
5479 // Fast current thread access
5480
5481 int os::win32::_thread_ptr_offset = 0;
5482
5483 static void call_wrapper_dummy() {}
5484
5485 // We need to call the os_exception_wrapper once so that it sets
5486 // up the offset from FS of the thread pointer.
5487 void os::win32::initialize_thread_ptr_offset() {
5488 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5489 NULL, NULL, NULL, NULL);
5490 }