1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "logging/log.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76
77 #ifdef _DEBUG
78 #include <crtdbg.h>
79 #endif
80
81
82 #include <windows.h>
83 #include <sys/types.h>
84 #include <sys/stat.h>
85 #include <sys/timeb.h>
86 #include <objidl.h>
87 #include <shlobj.h>
88
89 #include <malloc.h>
90 #include <signal.h>
91 #include <direct.h>
92 #include <errno.h>
93 #include <fcntl.h>
94 #include <io.h>
95 #include <process.h> // For _beginthreadex(), _endthreadex()
96 #include <imagehlp.h> // For os::dll_address_to_function_name
97 // for enumerating dll libraries
98 #include <vdmdbg.h>
99
100 // for timer info max values which include all bits
101 #define ALL_64_BITS CONST64(-1)
102
103 // For DLL loading/load error detection
104 // Values of PE COFF
105 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
106 #define IMAGE_FILE_SIGNATURE_LENGTH 4
107
108 static HANDLE main_process;
109 static HANDLE main_thread;
110 static int main_thread_id;
111
112 static FILETIME process_creation_time;
113 static FILETIME process_exit_time;
114 static FILETIME process_user_time;
115 static FILETIME process_kernel_time;
116
117 #ifdef _M_AMD64
118 #define __CPU__ amd64
119 #else
120 #define __CPU__ i486
121 #endif
122
123 // save DLL module handle, used by GetModuleFileName
124
125 HINSTANCE vm_lib_handle;
126
127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
128 switch (reason) {
129 case DLL_PROCESS_ATTACH:
130 vm_lib_handle = hinst;
131 if (ForceTimeHighResolution) {
132 timeBeginPeriod(1L);
133 }
134 break;
135 case DLL_PROCESS_DETACH:
136 if (ForceTimeHighResolution) {
137 timeEndPeriod(1L);
138 }
139 break;
140 default:
141 break;
142 }
143 return true;
144 }
145
146 static inline double fileTimeAsDouble(FILETIME* time) {
147 const double high = (double) ((unsigned int) ~0);
148 const double split = 10000000.0;
149 double result = (time->dwLowDateTime / split) +
150 time->dwHighDateTime * (high/split);
151 return result;
152 }
153
154 // Implementation of os
155
156 bool os::unsetenv(const char* name) {
157 assert(name != NULL, "Null pointer");
158 return (SetEnvironmentVariable(name, NULL) == TRUE);
159 }
160
161 // No setuid programs under Windows.
162 bool os::have_special_privileges() {
163 return false;
164 }
165
166
167 // This method is a periodic task to check for misbehaving JNI applications
168 // under CheckJNI, we can add any periodic checks here.
169 // For Windows at the moment does nothing
170 void os::run_periodic_checks() {
171 return;
172 }
173
174 // previous UnhandledExceptionFilter, if there is one
175 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
176
177 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
178
179 void os::init_system_properties_values() {
180 // sysclasspath, java_home, dll_dir
181 {
182 char *home_path;
183 char *dll_path;
184 char *pslash;
185 char *bin = "\\bin";
186 char home_dir[MAX_PATH + 1];
187 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
188
189 if (alt_home_dir != NULL) {
190 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
191 home_dir[MAX_PATH] = '\0';
192 } else {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; // get rid of \{client|server}
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \bin
203 }
204 }
205 }
206
207 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
208 if (home_path == NULL) {
209 return;
210 }
211 strcpy(home_path, home_dir);
212 Arguments::set_java_home(home_path);
213 FREE_C_HEAP_ARRAY(char, home_path);
214
215 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
216 mtInternal);
217 if (dll_path == NULL) {
218 return;
219 }
220 strcpy(dll_path, home_dir);
221 strcat(dll_path, bin);
222 Arguments::set_dll_dir(dll_path);
223 FREE_C_HEAP_ARRAY(char, dll_path);
224
225 if (!set_boot_path('\\', ';')) {
226 return;
227 }
228 }
229
230 // library_path
231 #define EXT_DIR "\\lib\\ext"
232 #define BIN_DIR "\\bin"
233 #define PACKAGE_DIR "\\Sun\\Java"
234 {
235 // Win32 library search order (See the documentation for LoadLibrary):
236 //
237 // 1. The directory from which application is loaded.
238 // 2. The system wide Java Extensions directory (Java only)
239 // 3. System directory (GetSystemDirectory)
240 // 4. Windows directory (GetWindowsDirectory)
241 // 5. The PATH environment variable
242 // 6. The current directory
243
244 char *library_path;
245 char tmp[MAX_PATH];
246 char *path_str = ::getenv("PATH");
247
248 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
249 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
250
251 library_path[0] = '\0';
252
253 GetModuleFileName(NULL, tmp, sizeof(tmp));
254 *(strrchr(tmp, '\\')) = '\0';
255 strcat(library_path, tmp);
256
257 GetWindowsDirectory(tmp, sizeof(tmp));
258 strcat(library_path, ";");
259 strcat(library_path, tmp);
260 strcat(library_path, PACKAGE_DIR BIN_DIR);
261
262 GetSystemDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265
266 GetWindowsDirectory(tmp, sizeof(tmp));
267 strcat(library_path, ";");
268 strcat(library_path, tmp);
269
270 if (path_str) {
271 strcat(library_path, ";");
272 strcat(library_path, path_str);
273 }
274
275 strcat(library_path, ";.");
276
277 Arguments::set_library_path(library_path);
278 FREE_C_HEAP_ARRAY(char, library_path);
279 }
280
281 // Default extensions directory
282 {
283 char path[MAX_PATH];
284 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
285 GetWindowsDirectory(path, MAX_PATH);
286 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
287 path, PACKAGE_DIR, EXT_DIR);
288 Arguments::set_ext_dirs(buf);
289 }
290 #undef EXT_DIR
291 #undef BIN_DIR
292 #undef PACKAGE_DIR
293
294 #ifndef _WIN64
295 // set our UnhandledExceptionFilter and save any previous one
296 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
297 #endif
298
299 // Done
300 return;
301 }
302
303 void os::breakpoint() {
304 DebugBreak();
305 }
306
307 // Invoked from the BREAKPOINT Macro
308 extern "C" void breakpoint() {
309 os::breakpoint();
310 }
311
312 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
313 // So far, this method is only used by Native Memory Tracking, which is
314 // only supported on Windows XP or later.
315 //
316 int os::get_native_stack(address* stack, int frames, int toSkip) {
317 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
318 for (int index = captured; index < frames; index ++) {
319 stack[index] = NULL;
320 }
321 return captured;
322 }
323
324
325 // os::current_stack_base()
326 //
327 // Returns the base of the stack, which is the stack's
328 // starting address. This function must be called
329 // while running on the stack of the thread being queried.
330
331 address os::current_stack_base() {
332 MEMORY_BASIC_INFORMATION minfo;
333 address stack_bottom;
334 size_t stack_size;
335
336 VirtualQuery(&minfo, &minfo, sizeof(minfo));
337 stack_bottom = (address)minfo.AllocationBase;
338 stack_size = minfo.RegionSize;
339
340 // Add up the sizes of all the regions with the same
341 // AllocationBase.
342 while (1) {
343 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
344 if (stack_bottom == (address)minfo.AllocationBase) {
345 stack_size += minfo.RegionSize;
346 } else {
347 break;
348 }
349 }
350 return stack_bottom + stack_size;
351 }
352
353 size_t os::current_stack_size() {
354 size_t sz;
355 MEMORY_BASIC_INFORMATION minfo;
356 VirtualQuery(&minfo, &minfo, sizeof(minfo));
357 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
358 return sz;
359 }
360
361 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
362 const struct tm* time_struct_ptr = localtime(clock);
363 if (time_struct_ptr != NULL) {
364 *res = *time_struct_ptr;
365 return res;
366 }
367 return NULL;
368 }
369
370 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
371 const struct tm* time_struct_ptr = gmtime(clock);
372 if (time_struct_ptr != NULL) {
373 *res = *time_struct_ptr;
374 return res;
375 }
376 return NULL;
377 }
378
379 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
380
381 // Thread start routine for all newly created threads
382 static unsigned __stdcall thread_native_entry(Thread* thread) {
383 // Try to randomize the cache line index of hot stack frames.
384 // This helps when threads of the same stack traces evict each other's
385 // cache lines. The threads can be either from the same JVM instance, or
386 // from different JVM instances. The benefit is especially true for
387 // processors with hyperthreading technology.
388 static int counter = 0;
389 int pid = os::current_process_id();
390 _alloca(((pid ^ counter++) & 7) * 128);
391
392 thread->initialize_thread_current();
393
394 OSThread* osthr = thread->osthread();
395 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
396
397 if (UseNUMA) {
398 int lgrp_id = os::numa_get_group_id();
399 if (lgrp_id != -1) {
400 thread->set_lgrp_id(lgrp_id);
401 }
402 }
403
404 // Diagnostic code to investigate JDK-6573254
405 int res = 30115; // non-java thread
406 if (thread->is_Java_thread()) {
407 res = 20115; // java thread
408 }
409
410 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
411
412 // Install a win32 structured exception handler around every thread created
413 // by VM, so VM can generate error dump when an exception occurred in non-
414 // Java thread (e.g. VM thread).
415 __try {
416 thread->run();
417 } __except(topLevelExceptionFilter(
418 (_EXCEPTION_POINTERS*)_exception_info())) {
419 // Nothing to do.
420 }
421
422 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
423
424 // One less thread is executing
425 // When the VMThread gets here, the main thread may have already exited
426 // which frees the CodeHeap containing the Atomic::add code
427 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
428 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
429 }
430
431 // If a thread has not deleted itself ("delete this") as part of its
432 // termination sequence, we have to ensure thread-local-storage is
433 // cleared before we actually terminate. No threads should ever be
434 // deleted asynchronously with respect to their termination.
435 if (Thread::current_or_null_safe() != NULL) {
436 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
437 thread->clear_thread_current();
438 }
439
440 // Thread must not return from exit_process_or_thread(), but if it does,
441 // let it proceed to exit normally
442 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
443 }
444
445 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
446 int thread_id) {
447 // Allocate the OSThread object
448 OSThread* osthread = new OSThread(NULL, NULL);
449 if (osthread == NULL) return NULL;
450
451 // Initialize support for Java interrupts
452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
453 if (interrupt_event == NULL) {
454 delete osthread;
455 return NULL;
456 }
457 osthread->set_interrupt_event(interrupt_event);
458
459 // Store info on the Win32 thread into the OSThread
460 osthread->set_thread_handle(thread_handle);
461 osthread->set_thread_id(thread_id);
462
463 if (UseNUMA) {
464 int lgrp_id = os::numa_get_group_id();
465 if (lgrp_id != -1) {
466 thread->set_lgrp_id(lgrp_id);
467 }
468 }
469
470 // Initial thread state is INITIALIZED, not SUSPENDED
471 osthread->set_state(INITIALIZED);
472
473 return osthread;
474 }
475
476
477 bool os::create_attached_thread(JavaThread* thread) {
478 #ifdef ASSERT
479 thread->verify_not_published();
480 #endif
481 HANDLE thread_h;
482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
483 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
484 fatal("DuplicateHandle failed\n");
485 }
486 OSThread* osthread = create_os_thread(thread, thread_h,
487 (int)current_thread_id());
488 if (osthread == NULL) {
489 return false;
490 }
491
492 // Initial thread state is RUNNABLE
493 osthread->set_state(RUNNABLE);
494
495 thread->set_osthread(osthread);
496
497 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
498 os::current_thread_id());
499
500 return true;
501 }
502
503 bool os::create_main_thread(JavaThread* thread) {
504 #ifdef ASSERT
505 thread->verify_not_published();
506 #endif
507 if (_starting_thread == NULL) {
508 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
509 if (_starting_thread == NULL) {
510 return false;
511 }
512 }
513
514 // The primordial thread is runnable from the start)
515 _starting_thread->set_state(RUNNABLE);
516
517 thread->set_osthread(_starting_thread);
518 return true;
519 }
520
521 // Helper function to trace _beginthreadex attributes,
522 // similar to os::Posix::describe_pthread_attr()
523 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
524 size_t stacksize, unsigned initflag) {
525 stringStream ss(buf, buflen);
526 if (stacksize == 0) {
527 ss.print("stacksize: default, ");
528 } else {
529 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
530 }
531 ss.print("flags: ");
532 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
533 #define ALL(X) \
534 X(CREATE_SUSPENDED) \
535 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
536 ALL(PRINT_FLAG)
537 #undef ALL
538 #undef PRINT_FLAG
539 return buf;
540 }
541
542 // Allocate and initialize a new OSThread
543 bool os::create_thread(Thread* thread, ThreadType thr_type,
544 size_t stack_size) {
545 unsigned thread_id;
546
547 // Allocate the OSThread object
548 OSThread* osthread = new OSThread(NULL, NULL);
549 if (osthread == NULL) {
550 return false;
551 }
552
553 // Initialize support for Java interrupts
554 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
555 if (interrupt_event == NULL) {
556 delete osthread;
557 return NULL;
558 }
559 osthread->set_interrupt_event(interrupt_event);
560 osthread->set_interrupted(false);
561
562 thread->set_osthread(osthread);
563
564 if (stack_size == 0) {
565 switch (thr_type) {
566 case os::java_thread:
567 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
568 if (JavaThread::stack_size_at_create() > 0) {
569 stack_size = JavaThread::stack_size_at_create();
570 }
571 break;
572 case os::compiler_thread:
573 if (CompilerThreadStackSize > 0) {
574 stack_size = (size_t)(CompilerThreadStackSize * K);
575 break;
576 } // else fall through:
577 // use VMThreadStackSize if CompilerThreadStackSize is not defined
578 case os::vm_thread:
579 case os::pgc_thread:
580 case os::cgc_thread:
581 case os::watcher_thread:
582 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
583 break;
584 }
585 }
586
587 // Create the Win32 thread
588 //
589 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
590 // does not specify stack size. Instead, it specifies the size of
591 // initially committed space. The stack size is determined by
592 // PE header in the executable. If the committed "stack_size" is larger
593 // than default value in the PE header, the stack is rounded up to the
594 // nearest multiple of 1MB. For example if the launcher has default
595 // stack size of 320k, specifying any size less than 320k does not
596 // affect the actual stack size at all, it only affects the initial
597 // commitment. On the other hand, specifying 'stack_size' larger than
598 // default value may cause significant increase in memory usage, because
599 // not only the stack space will be rounded up to MB, but also the
600 // entire space is committed upfront.
601 //
602 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
603 // for CreateThread() that can treat 'stack_size' as stack size. However we
604 // are not supposed to call CreateThread() directly according to MSDN
605 // document because JVM uses C runtime library. The good news is that the
606 // flag appears to work with _beginthredex() as well.
607
608 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
609 HANDLE thread_handle =
610 (HANDLE)_beginthreadex(NULL,
611 (unsigned)stack_size,
612 (unsigned (__stdcall *)(void*)) thread_native_entry,
613 thread,
614 initflag,
615 &thread_id);
616
617 char buf[64];
618 if (thread_handle != NULL) {
619 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
620 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
621 } else {
622 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
623 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
624 }
625
626 if (thread_handle == NULL) {
627 // Need to clean up stuff we've allocated so far
628 CloseHandle(osthread->interrupt_event());
629 thread->set_osthread(NULL);
630 delete osthread;
631 return NULL;
632 }
633
634 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
635
636 // Store info on the Win32 thread into the OSThread
637 osthread->set_thread_handle(thread_handle);
638 osthread->set_thread_id(thread_id);
639
640 // Initial thread state is INITIALIZED, not SUSPENDED
641 osthread->set_state(INITIALIZED);
642
643 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
644 return true;
645 }
646
647
648 // Free Win32 resources related to the OSThread
649 void os::free_thread(OSThread* osthread) {
650 assert(osthread != NULL, "osthread not set");
651
652 // We are told to free resources of the argument thread,
653 // but we can only really operate on the current thread.
654 assert(Thread::current()->osthread() == osthread,
655 "os::free_thread but not current thread");
656
657 CloseHandle(osthread->thread_handle());
658 CloseHandle(osthread->interrupt_event());
659 delete osthread;
660 }
661
662 static jlong first_filetime;
663 static jlong initial_performance_count;
664 static jlong performance_frequency;
665
666
667 jlong as_long(LARGE_INTEGER x) {
668 jlong result = 0; // initialization to avoid warning
669 set_high(&result, x.HighPart);
670 set_low(&result, x.LowPart);
671 return result;
672 }
673
674
675 jlong os::elapsed_counter() {
676 LARGE_INTEGER count;
677 QueryPerformanceCounter(&count);
678 return as_long(count) - initial_performance_count;
679 }
680
681
682 jlong os::elapsed_frequency() {
683 return performance_frequency;
684 }
685
686
687 julong os::available_memory() {
688 return win32::available_memory();
689 }
690
691 julong os::win32::available_memory() {
692 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
693 // value if total memory is larger than 4GB
694 MEMORYSTATUSEX ms;
695 ms.dwLength = sizeof(ms);
696 GlobalMemoryStatusEx(&ms);
697
698 return (julong)ms.ullAvailPhys;
699 }
700
701 julong os::physical_memory() {
702 return win32::physical_memory();
703 }
704
705 bool os::has_allocatable_memory_limit(julong* limit) {
706 MEMORYSTATUSEX ms;
707 ms.dwLength = sizeof(ms);
708 GlobalMemoryStatusEx(&ms);
709 #ifdef _LP64
710 *limit = (julong)ms.ullAvailVirtual;
711 return true;
712 #else
713 // Limit to 1400m because of the 2gb address space wall
714 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
715 return true;
716 #endif
717 }
718
719 int os::active_processor_count() {
720 DWORD_PTR lpProcessAffinityMask = 0;
721 DWORD_PTR lpSystemAffinityMask = 0;
722 int proc_count = processor_count();
723 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
724 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
725 // Nof active processors is number of bits in process affinity mask
726 int bitcount = 0;
727 while (lpProcessAffinityMask != 0) {
728 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
729 bitcount++;
730 }
731 return bitcount;
732 } else {
733 return proc_count;
734 }
735 }
736
737 void os::set_native_thread_name(const char *name) {
738
739 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
740 //
741 // Note that unfortunately this only works if the process
742 // is already attached to a debugger; debugger must observe
743 // the exception below to show the correct name.
744
745 // If there is no debugger attached skip raising the exception
746 if (!IsDebuggerPresent()) {
747 return;
748 }
749
750 const DWORD MS_VC_EXCEPTION = 0x406D1388;
751 struct {
752 DWORD dwType; // must be 0x1000
753 LPCSTR szName; // pointer to name (in user addr space)
754 DWORD dwThreadID; // thread ID (-1=caller thread)
755 DWORD dwFlags; // reserved for future use, must be zero
756 } info;
757
758 info.dwType = 0x1000;
759 info.szName = name;
760 info.dwThreadID = -1;
761 info.dwFlags = 0;
762
763 __try {
764 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
765 } __except(EXCEPTION_EXECUTE_HANDLER) {}
766 }
767
768 bool os::distribute_processes(uint length, uint* distribution) {
769 // Not yet implemented.
770 return false;
771 }
772
773 bool os::bind_to_processor(uint processor_id) {
774 // Not yet implemented.
775 return false;
776 }
777
778 void os::win32::initialize_performance_counter() {
779 LARGE_INTEGER count;
780 QueryPerformanceFrequency(&count);
781 performance_frequency = as_long(count);
782 QueryPerformanceCounter(&count);
783 initial_performance_count = as_long(count);
784 }
785
786
787 double os::elapsedTime() {
788 return (double) elapsed_counter() / (double) elapsed_frequency();
789 }
790
791
792 // Windows format:
793 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
794 // Java format:
795 // Java standards require the number of milliseconds since 1/1/1970
796
797 // Constant offset - calculated using offset()
798 static jlong _offset = 116444736000000000;
799 // Fake time counter for reproducible results when debugging
800 static jlong fake_time = 0;
801
802 #ifdef ASSERT
803 // Just to be safe, recalculate the offset in debug mode
804 static jlong _calculated_offset = 0;
805 static int _has_calculated_offset = 0;
806
807 jlong offset() {
808 if (_has_calculated_offset) return _calculated_offset;
809 SYSTEMTIME java_origin;
810 java_origin.wYear = 1970;
811 java_origin.wMonth = 1;
812 java_origin.wDayOfWeek = 0; // ignored
813 java_origin.wDay = 1;
814 java_origin.wHour = 0;
815 java_origin.wMinute = 0;
816 java_origin.wSecond = 0;
817 java_origin.wMilliseconds = 0;
818 FILETIME jot;
819 if (!SystemTimeToFileTime(&java_origin, &jot)) {
820 fatal("Error = %d\nWindows error", GetLastError());
821 }
822 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
823 _has_calculated_offset = 1;
824 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
825 return _calculated_offset;
826 }
827 #else
828 jlong offset() {
829 return _offset;
830 }
831 #endif
832
833 jlong windows_to_java_time(FILETIME wt) {
834 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
835 return (a - offset()) / 10000;
836 }
837
838 // Returns time ticks in (10th of micro seconds)
839 jlong windows_to_time_ticks(FILETIME wt) {
840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
841 return (a - offset());
842 }
843
844 FILETIME java_to_windows_time(jlong l) {
845 jlong a = (l * 10000) + offset();
846 FILETIME result;
847 result.dwHighDateTime = high(a);
848 result.dwLowDateTime = low(a);
849 return result;
850 }
851
852 bool os::supports_vtime() { return true; }
853 bool os::enable_vtime() { return false; }
854 bool os::vtime_enabled() { return false; }
855
856 double os::elapsedVTime() {
857 FILETIME created;
858 FILETIME exited;
859 FILETIME kernel;
860 FILETIME user;
861 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
862 // the resolution of windows_to_java_time() should be sufficient (ms)
863 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
864 } else {
865 return elapsedTime();
866 }
867 }
868
869 jlong os::javaTimeMillis() {
870 if (UseFakeTimers) {
871 return fake_time++;
872 } else {
873 FILETIME wt;
874 GetSystemTimeAsFileTime(&wt);
875 return windows_to_java_time(wt);
876 }
877 }
878
879 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
880 FILETIME wt;
881 GetSystemTimeAsFileTime(&wt);
882 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
883 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
884 seconds = secs;
885 nanos = jlong(ticks - (secs*10000000)) * 100;
886 }
887
888 jlong os::javaTimeNanos() {
889 LARGE_INTEGER current_count;
890 QueryPerformanceCounter(¤t_count);
891 double current = as_long(current_count);
892 double freq = performance_frequency;
893 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
894 return time;
895 }
896
897 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
898 jlong freq = performance_frequency;
899 if (freq < NANOSECS_PER_SEC) {
900 // the performance counter is 64 bits and we will
901 // be multiplying it -- so no wrap in 64 bits
902 info_ptr->max_value = ALL_64_BITS;
903 } else if (freq > NANOSECS_PER_SEC) {
904 // use the max value the counter can reach to
905 // determine the max value which could be returned
906 julong max_counter = (julong)ALL_64_BITS;
907 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
908 } else {
909 // the performance counter is 64 bits and we will
910 // be using it directly -- so no wrap in 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912 }
913
914 // using a counter, so no skipping
915 info_ptr->may_skip_backward = false;
916 info_ptr->may_skip_forward = false;
917
918 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
919 }
920
921 char* os::local_time_string(char *buf, size_t buflen) {
922 SYSTEMTIME st;
923 GetLocalTime(&st);
924 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
925 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
926 return buf;
927 }
928
929 bool os::getTimesSecs(double* process_real_time,
930 double* process_user_time,
931 double* process_system_time) {
932 HANDLE h_process = GetCurrentProcess();
933 FILETIME create_time, exit_time, kernel_time, user_time;
934 BOOL result = GetProcessTimes(h_process,
935 &create_time,
936 &exit_time,
937 &kernel_time,
938 &user_time);
939 if (result != 0) {
940 FILETIME wt;
941 GetSystemTimeAsFileTime(&wt);
942 jlong rtc_millis = windows_to_java_time(wt);
943 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
944 *process_user_time =
945 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
946 *process_system_time =
947 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
948 return true;
949 } else {
950 return false;
951 }
952 }
953
954 void os::shutdown() {
955 // allow PerfMemory to attempt cleanup of any persistent resources
956 perfMemory_exit();
957
958 // flush buffered output, finish log files
959 ostream_abort();
960
961 // Check for abort hook
962 abort_hook_t abort_hook = Arguments::abort_hook();
963 if (abort_hook != NULL) {
964 abort_hook();
965 }
966 }
967
968
969 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
970 PMINIDUMP_EXCEPTION_INFORMATION,
971 PMINIDUMP_USER_STREAM_INFORMATION,
972 PMINIDUMP_CALLBACK_INFORMATION);
973
974 static HANDLE dumpFile = NULL;
975
976 // Check if dump file can be created.
977 void os::check_dump_limit(char* buffer, size_t buffsz) {
978 bool status = true;
979 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
980 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
981 status = false;
982 }
983
984 #ifndef ASSERT
985 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
986 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
987 status = false;
988 }
989 #endif
990
991 if (status) {
992 const char* cwd = get_current_directory(NULL, 0);
993 int pid = current_process_id();
994 if (cwd != NULL) {
995 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
996 } else {
997 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
998 }
999
1000 if (dumpFile == NULL &&
1001 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1002 == INVALID_HANDLE_VALUE) {
1003 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1004 status = false;
1005 }
1006 }
1007 VMError::record_coredump_status(buffer, status);
1008 }
1009
1010 void os::abort(bool dump_core, void* siginfo, const void* context) {
1011 HINSTANCE dbghelp;
1012 EXCEPTION_POINTERS ep;
1013 MINIDUMP_EXCEPTION_INFORMATION mei;
1014 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1015
1016 HANDLE hProcess = GetCurrentProcess();
1017 DWORD processId = GetCurrentProcessId();
1018 MINIDUMP_TYPE dumpType;
1019
1020 shutdown();
1021 if (!dump_core || dumpFile == NULL) {
1022 if (dumpFile != NULL) {
1023 CloseHandle(dumpFile);
1024 }
1025 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1026 }
1027
1028 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1029
1030 if (dbghelp == NULL) {
1031 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1032 CloseHandle(dumpFile);
1033 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1034 }
1035
1036 _MiniDumpWriteDump =
1037 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1038 PMINIDUMP_EXCEPTION_INFORMATION,
1039 PMINIDUMP_USER_STREAM_INFORMATION,
1040 PMINIDUMP_CALLBACK_INFORMATION),
1041 GetProcAddress(dbghelp,
1042 "MiniDumpWriteDump"));
1043
1044 if (_MiniDumpWriteDump == NULL) {
1045 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1046 CloseHandle(dumpFile);
1047 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1048 }
1049
1050 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1051 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1052
1053 if (siginfo != NULL && context != NULL) {
1054 ep.ContextRecord = (PCONTEXT) context;
1055 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1056
1057 mei.ThreadId = GetCurrentThreadId();
1058 mei.ExceptionPointers = &ep;
1059 pmei = &mei;
1060 } else {
1061 pmei = NULL;
1062 }
1063
1064 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1065 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1066 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1067 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1068 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1069 }
1070 CloseHandle(dumpFile);
1071 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1072 }
1073
1074 // Die immediately, no exit hook, no abort hook, no cleanup.
1075 void os::die() {
1076 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1077 }
1078
1079 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1080 // * dirent_md.c 1.15 00/02/02
1081 //
1082 // The declarations for DIR and struct dirent are in jvm_win32.h.
1083
1084 // Caller must have already run dirname through JVM_NativePath, which removes
1085 // duplicate slashes and converts all instances of '/' into '\\'.
1086
1087 DIR * os::opendir(const char *dirname) {
1088 assert(dirname != NULL, "just checking"); // hotspot change
1089 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1090 DWORD fattr; // hotspot change
1091 char alt_dirname[4] = { 0, 0, 0, 0 };
1092
1093 if (dirp == 0) {
1094 errno = ENOMEM;
1095 return 0;
1096 }
1097
1098 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1099 // as a directory in FindFirstFile(). We detect this case here and
1100 // prepend the current drive name.
1101 //
1102 if (dirname[1] == '\0' && dirname[0] == '\\') {
1103 alt_dirname[0] = _getdrive() + 'A' - 1;
1104 alt_dirname[1] = ':';
1105 alt_dirname[2] = '\\';
1106 alt_dirname[3] = '\0';
1107 dirname = alt_dirname;
1108 }
1109
1110 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1111 if (dirp->path == 0) {
1112 free(dirp);
1113 errno = ENOMEM;
1114 return 0;
1115 }
1116 strcpy(dirp->path, dirname);
1117
1118 fattr = GetFileAttributes(dirp->path);
1119 if (fattr == 0xffffffff) {
1120 free(dirp->path);
1121 free(dirp);
1122 errno = ENOENT;
1123 return 0;
1124 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1125 free(dirp->path);
1126 free(dirp);
1127 errno = ENOTDIR;
1128 return 0;
1129 }
1130
1131 // Append "*.*", or possibly "\\*.*", to path
1132 if (dirp->path[1] == ':' &&
1133 (dirp->path[2] == '\0' ||
1134 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1135 // No '\\' needed for cases like "Z:" or "Z:\"
1136 strcat(dirp->path, "*.*");
1137 } else {
1138 strcat(dirp->path, "\\*.*");
1139 }
1140
1141 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1142 if (dirp->handle == INVALID_HANDLE_VALUE) {
1143 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1144 free(dirp->path);
1145 free(dirp);
1146 errno = EACCES;
1147 return 0;
1148 }
1149 }
1150 return dirp;
1151 }
1152
1153 // parameter dbuf unused on Windows
1154 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1155 assert(dirp != NULL, "just checking"); // hotspot change
1156 if (dirp->handle == INVALID_HANDLE_VALUE) {
1157 return 0;
1158 }
1159
1160 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1161
1162 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1163 if (GetLastError() == ERROR_INVALID_HANDLE) {
1164 errno = EBADF;
1165 return 0;
1166 }
1167 FindClose(dirp->handle);
1168 dirp->handle = INVALID_HANDLE_VALUE;
1169 }
1170
1171 return &dirp->dirent;
1172 }
1173
1174 int os::closedir(DIR *dirp) {
1175 assert(dirp != NULL, "just checking"); // hotspot change
1176 if (dirp->handle != INVALID_HANDLE_VALUE) {
1177 if (!FindClose(dirp->handle)) {
1178 errno = EBADF;
1179 return -1;
1180 }
1181 dirp->handle = INVALID_HANDLE_VALUE;
1182 }
1183 free(dirp->path);
1184 free(dirp);
1185 return 0;
1186 }
1187
1188 // This must be hard coded because it's the system's temporary
1189 // directory not the java application's temp directory, ala java.io.tmpdir.
1190 const char* os::get_temp_directory() {
1191 static char path_buf[MAX_PATH];
1192 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1193 return path_buf;
1194 } else {
1195 path_buf[0] = '\0';
1196 return path_buf;
1197 }
1198 }
1199
1200 static bool file_exists(const char* filename) {
1201 if (filename == NULL || strlen(filename) == 0) {
1202 return false;
1203 }
1204 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1205 }
1206
1207 bool os::dll_build_name(char *buffer, size_t buflen,
1208 const char* pname, const char* fname) {
1209 bool retval = false;
1210 const size_t pnamelen = pname ? strlen(pname) : 0;
1211 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1212
1213 // Return error on buffer overflow.
1214 if (pnamelen + strlen(fname) + 10 > buflen) {
1215 return retval;
1216 }
1217
1218 if (pnamelen == 0) {
1219 jio_snprintf(buffer, buflen, "%s.dll", fname);
1220 retval = true;
1221 } else if (c == ':' || c == '\\') {
1222 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1223 retval = true;
1224 } else if (strchr(pname, *os::path_separator()) != NULL) {
1225 int n;
1226 char** pelements = split_path(pname, &n);
1227 if (pelements == NULL) {
1228 return false;
1229 }
1230 for (int i = 0; i < n; i++) {
1231 char* path = pelements[i];
1232 // Really shouldn't be NULL, but check can't hurt
1233 size_t plen = (path == NULL) ? 0 : strlen(path);
1234 if (plen == 0) {
1235 continue; // skip the empty path values
1236 }
1237 const char lastchar = path[plen - 1];
1238 if (lastchar == ':' || lastchar == '\\') {
1239 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1240 } else {
1241 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1242 }
1243 if (file_exists(buffer)) {
1244 retval = true;
1245 break;
1246 }
1247 }
1248 // release the storage
1249 for (int i = 0; i < n; i++) {
1250 if (pelements[i] != NULL) {
1251 FREE_C_HEAP_ARRAY(char, pelements[i]);
1252 }
1253 }
1254 if (pelements != NULL) {
1255 FREE_C_HEAP_ARRAY(char*, pelements);
1256 }
1257 } else {
1258 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1259 retval = true;
1260 }
1261 return retval;
1262 }
1263
1264 // Needs to be in os specific directory because windows requires another
1265 // header file <direct.h>
1266 const char* os::get_current_directory(char *buf, size_t buflen) {
1267 int n = static_cast<int>(buflen);
1268 if (buflen > INT_MAX) n = INT_MAX;
1269 return _getcwd(buf, n);
1270 }
1271
1272 //-----------------------------------------------------------
1273 // Helper functions for fatal error handler
1274 #ifdef _WIN64
1275 // Helper routine which returns true if address in
1276 // within the NTDLL address space.
1277 //
1278 static bool _addr_in_ntdll(address addr) {
1279 HMODULE hmod;
1280 MODULEINFO minfo;
1281
1282 hmod = GetModuleHandle("NTDLL.DLL");
1283 if (hmod == NULL) return false;
1284 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1285 &minfo, sizeof(MODULEINFO))) {
1286 return false;
1287 }
1288
1289 if ((addr >= minfo.lpBaseOfDll) &&
1290 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1291 return true;
1292 } else {
1293 return false;
1294 }
1295 }
1296 #endif
1297
1298 struct _modinfo {
1299 address addr;
1300 char* full_path; // point to a char buffer
1301 int buflen; // size of the buffer
1302 address base_addr;
1303 };
1304
1305 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1306 address top_address, void * param) {
1307 struct _modinfo *pmod = (struct _modinfo *)param;
1308 if (!pmod) return -1;
1309
1310 if (base_addr <= pmod->addr &&
1311 top_address > pmod->addr) {
1312 // if a buffer is provided, copy path name to the buffer
1313 if (pmod->full_path) {
1314 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1315 }
1316 pmod->base_addr = base_addr;
1317 return 1;
1318 }
1319 return 0;
1320 }
1321
1322 bool os::dll_address_to_library_name(address addr, char* buf,
1323 int buflen, int* offset) {
1324 // buf is not optional, but offset is optional
1325 assert(buf != NULL, "sanity check");
1326
1327 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1328 // return the full path to the DLL file, sometimes it returns path
1329 // to the corresponding PDB file (debug info); sometimes it only
1330 // returns partial path, which makes life painful.
1331
1332 struct _modinfo mi;
1333 mi.addr = addr;
1334 mi.full_path = buf;
1335 mi.buflen = buflen;
1336 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1337 // buf already contains path name
1338 if (offset) *offset = addr - mi.base_addr;
1339 return true;
1340 }
1341
1342 buf[0] = '\0';
1343 if (offset) *offset = -1;
1344 return false;
1345 }
1346
1347 bool os::dll_address_to_function_name(address addr, char *buf,
1348 int buflen, int *offset,
1349 bool demangle) {
1350 // buf is not optional, but offset is optional
1351 assert(buf != NULL, "sanity check");
1352
1353 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1354 return true;
1355 }
1356 if (offset != NULL) *offset = -1;
1357 buf[0] = '\0';
1358 return false;
1359 }
1360
1361 // save the start and end address of jvm.dll into param[0] and param[1]
1362 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1363 address top_address, void * param) {
1364 if (!param) return -1;
1365
1366 if (base_addr <= (address)_locate_jvm_dll &&
1367 top_address > (address)_locate_jvm_dll) {
1368 ((address*)param)[0] = base_addr;
1369 ((address*)param)[1] = top_address;
1370 return 1;
1371 }
1372 return 0;
1373 }
1374
1375 address vm_lib_location[2]; // start and end address of jvm.dll
1376
1377 // check if addr is inside jvm.dll
1378 bool os::address_is_in_vm(address addr) {
1379 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1380 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1381 assert(false, "Can't find jvm module.");
1382 return false;
1383 }
1384 }
1385
1386 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1387 }
1388
1389 // print module info; param is outputStream*
1390 static int _print_module(const char* fname, address base_address,
1391 address top_address, void* param) {
1392 if (!param) return -1;
1393
1394 outputStream* st = (outputStream*)param;
1395
1396 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1397 return 0;
1398 }
1399
1400 // Loads .dll/.so and
1401 // in case of error it checks if .dll/.so was built for the
1402 // same architecture as Hotspot is running on
1403 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1404 void * result = LoadLibrary(name);
1405 if (result != NULL) {
1406 return result;
1407 }
1408
1409 DWORD errcode = GetLastError();
1410 if (errcode == ERROR_MOD_NOT_FOUND) {
1411 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1412 ebuf[ebuflen - 1] = '\0';
1413 return NULL;
1414 }
1415
1416 // Parsing dll below
1417 // If we can read dll-info and find that dll was built
1418 // for an architecture other than Hotspot is running in
1419 // - then print to buffer "DLL was built for a different architecture"
1420 // else call os::lasterror to obtain system error message
1421
1422 // Read system error message into ebuf
1423 // It may or may not be overwritten below (in the for loop and just above)
1424 lasterror(ebuf, (size_t) ebuflen);
1425 ebuf[ebuflen - 1] = '\0';
1426 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1427 if (fd < 0) {
1428 return NULL;
1429 }
1430
1431 uint32_t signature_offset;
1432 uint16_t lib_arch = 0;
1433 bool failed_to_get_lib_arch =
1434 ( // Go to position 3c in the dll
1435 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1436 ||
1437 // Read location of signature
1438 (sizeof(signature_offset) !=
1439 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1440 ||
1441 // Go to COFF File Header in dll
1442 // that is located after "signature" (4 bytes long)
1443 (os::seek_to_file_offset(fd,
1444 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1445 ||
1446 // Read field that contains code of architecture
1447 // that dll was built for
1448 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1449 );
1450
1451 ::close(fd);
1452 if (failed_to_get_lib_arch) {
1453 // file i/o error - report os::lasterror(...) msg
1454 return NULL;
1455 }
1456
1457 typedef struct {
1458 uint16_t arch_code;
1459 char* arch_name;
1460 } arch_t;
1461
1462 static const arch_t arch_array[] = {
1463 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1464 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1465 };
1466 #if (defined _M_AMD64)
1467 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1468 #elif (defined _M_IX86)
1469 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1470 #else
1471 #error Method os::dll_load requires that one of following \
1472 is defined :_M_AMD64 or _M_IX86
1473 #endif
1474
1475
1476 // Obtain a string for printf operation
1477 // lib_arch_str shall contain string what platform this .dll was built for
1478 // running_arch_str shall string contain what platform Hotspot was built for
1479 char *running_arch_str = NULL, *lib_arch_str = NULL;
1480 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1481 if (lib_arch == arch_array[i].arch_code) {
1482 lib_arch_str = arch_array[i].arch_name;
1483 }
1484 if (running_arch == arch_array[i].arch_code) {
1485 running_arch_str = arch_array[i].arch_name;
1486 }
1487 }
1488
1489 assert(running_arch_str,
1490 "Didn't find running architecture code in arch_array");
1491
1492 // If the architecture is right
1493 // but some other error took place - report os::lasterror(...) msg
1494 if (lib_arch == running_arch) {
1495 return NULL;
1496 }
1497
1498 if (lib_arch_str != NULL) {
1499 ::_snprintf(ebuf, ebuflen - 1,
1500 "Can't load %s-bit .dll on a %s-bit platform",
1501 lib_arch_str, running_arch_str);
1502 } else {
1503 // don't know what architecture this dll was build for
1504 ::_snprintf(ebuf, ebuflen - 1,
1505 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1506 lib_arch, running_arch_str);
1507 }
1508
1509 return NULL;
1510 }
1511
1512 void os::print_dll_info(outputStream *st) {
1513 st->print_cr("Dynamic libraries:");
1514 get_loaded_modules_info(_print_module, (void *)st);
1515 }
1516
1517 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1518 HANDLE hProcess;
1519
1520 # define MAX_NUM_MODULES 128
1521 HMODULE modules[MAX_NUM_MODULES];
1522 static char filename[MAX_PATH];
1523 int result = 0;
1524
1525 int pid = os::current_process_id();
1526 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1527 FALSE, pid);
1528 if (hProcess == NULL) return 0;
1529
1530 DWORD size_needed;
1531 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1532 CloseHandle(hProcess);
1533 return 0;
1534 }
1535
1536 // number of modules that are currently loaded
1537 int num_modules = size_needed / sizeof(HMODULE);
1538
1539 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1540 // Get Full pathname:
1541 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1542 filename[0] = '\0';
1543 }
1544
1545 MODULEINFO modinfo;
1546 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1547 modinfo.lpBaseOfDll = NULL;
1548 modinfo.SizeOfImage = 0;
1549 }
1550
1551 // Invoke callback function
1552 result = callback(filename, (address)modinfo.lpBaseOfDll,
1553 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1554 if (result) break;
1555 }
1556
1557 CloseHandle(hProcess);
1558 return result;
1559 }
1560
1561 bool os::get_host_name(char* buf, size_t buflen) {
1562 DWORD size = (DWORD)buflen;
1563 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1564 }
1565
1566 void os::get_summary_os_info(char* buf, size_t buflen) {
1567 stringStream sst(buf, buflen);
1568 os::win32::print_windows_version(&sst);
1569 // chop off newline character
1570 char* nl = strchr(buf, '\n');
1571 if (nl != NULL) *nl = '\0';
1572 }
1573
1574 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1575 int ret = vsnprintf(buf, len, fmt, args);
1576 // Get the correct buffer size if buf is too small
1577 if (ret < 0) {
1578 return _vscprintf(fmt, args);
1579 }
1580 return ret;
1581 }
1582
1583 static inline time_t get_mtime(const char* filename) {
1584 struct stat st;
1585 int ret = os::stat(filename, &st);
1586 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1587 return st.st_mtime;
1588 }
1589
1590 int os::compare_file_modified_times(const char* file1, const char* file2) {
1591 time_t t1 = get_mtime(file1);
1592 time_t t2 = get_mtime(file2);
1593 return t1 - t2;
1594 }
1595
1596 void os::print_os_info_brief(outputStream* st) {
1597 os::print_os_info(st);
1598 }
1599
1600 void os::print_os_info(outputStream* st) {
1601 #ifdef ASSERT
1602 char buffer[1024];
1603 st->print("HostName: ");
1604 if (get_host_name(buffer, sizeof(buffer))) {
1605 st->print("%s ", buffer);
1606 } else {
1607 st->print("N/A ");
1608 }
1609 #endif
1610 st->print("OS:");
1611 os::win32::print_windows_version(st);
1612 }
1613
1614 void os::win32::print_windows_version(outputStream* st) {
1615 OSVERSIONINFOEX osvi;
1616 VS_FIXEDFILEINFO *file_info;
1617 TCHAR kernel32_path[MAX_PATH];
1618 UINT len, ret;
1619
1620 // Use the GetVersionEx information to see if we're on a server or
1621 // workstation edition of Windows. Starting with Windows 8.1 we can't
1622 // trust the OS version information returned by this API.
1623 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1624 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1625 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1626 st->print_cr("Call to GetVersionEx failed");
1627 return;
1628 }
1629 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1630
1631 // Get the full path to \Windows\System32\kernel32.dll and use that for
1632 // determining what version of Windows we're running on.
1633 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1634 ret = GetSystemDirectory(kernel32_path, len);
1635 if (ret == 0 || ret > len) {
1636 st->print_cr("Call to GetSystemDirectory failed");
1637 return;
1638 }
1639 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1640
1641 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1642 if (version_size == 0) {
1643 st->print_cr("Call to GetFileVersionInfoSize failed");
1644 return;
1645 }
1646
1647 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1648 if (version_info == NULL) {
1649 st->print_cr("Failed to allocate version_info");
1650 return;
1651 }
1652
1653 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1654 os::free(version_info);
1655 st->print_cr("Call to GetFileVersionInfo failed");
1656 return;
1657 }
1658
1659 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1660 os::free(version_info);
1661 st->print_cr("Call to VerQueryValue failed");
1662 return;
1663 }
1664
1665 int major_version = HIWORD(file_info->dwProductVersionMS);
1666 int minor_version = LOWORD(file_info->dwProductVersionMS);
1667 int build_number = HIWORD(file_info->dwProductVersionLS);
1668 int build_minor = LOWORD(file_info->dwProductVersionLS);
1669 int os_vers = major_version * 1000 + minor_version;
1670 os::free(version_info);
1671
1672 st->print(" Windows ");
1673 switch (os_vers) {
1674
1675 case 6000:
1676 if (is_workstation) {
1677 st->print("Vista");
1678 } else {
1679 st->print("Server 2008");
1680 }
1681 break;
1682
1683 case 6001:
1684 if (is_workstation) {
1685 st->print("7");
1686 } else {
1687 st->print("Server 2008 R2");
1688 }
1689 break;
1690
1691 case 6002:
1692 if (is_workstation) {
1693 st->print("8");
1694 } else {
1695 st->print("Server 2012");
1696 }
1697 break;
1698
1699 case 6003:
1700 if (is_workstation) {
1701 st->print("8.1");
1702 } else {
1703 st->print("Server 2012 R2");
1704 }
1705 break;
1706
1707 case 10000:
1708 if (is_workstation) {
1709 st->print("10");
1710 } else {
1711 st->print("Server 2016");
1712 }
1713 break;
1714
1715 default:
1716 // Unrecognized windows, print out its major and minor versions
1717 st->print("%d.%d", major_version, minor_version);
1718 break;
1719 }
1720
1721 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1722 // find out whether we are running on 64 bit processor or not
1723 SYSTEM_INFO si;
1724 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1725 GetNativeSystemInfo(&si);
1726 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1727 st->print(" , 64 bit");
1728 }
1729
1730 st->print(" Build %d", build_number);
1731 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1732 st->cr();
1733 }
1734
1735 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1736 // Nothing to do for now.
1737 }
1738
1739 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1740 HKEY key;
1741 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1742 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1743 if (status == ERROR_SUCCESS) {
1744 DWORD size = (DWORD)buflen;
1745 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1746 if (status != ERROR_SUCCESS) {
1747 strncpy(buf, "## __CPU__", buflen);
1748 }
1749 RegCloseKey(key);
1750 } else {
1751 // Put generic cpu info to return
1752 strncpy(buf, "## __CPU__", buflen);
1753 }
1754 }
1755
1756 void os::print_memory_info(outputStream* st) {
1757 st->print("Memory:");
1758 st->print(" %dk page", os::vm_page_size()>>10);
1759
1760 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1761 // value if total memory is larger than 4GB
1762 MEMORYSTATUSEX ms;
1763 ms.dwLength = sizeof(ms);
1764 GlobalMemoryStatusEx(&ms);
1765
1766 st->print(", physical %uk", os::physical_memory() >> 10);
1767 st->print("(%uk free)", os::available_memory() >> 10);
1768
1769 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1770 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1771 st->cr();
1772 }
1773
1774 void os::print_siginfo(outputStream *st, const void* siginfo) {
1775 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1776 st->print("siginfo:");
1777
1778 char tmp[64];
1779 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1780 strcpy(tmp, "EXCEPTION_??");
1781 }
1782 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1783
1784 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1785 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1786 er->NumberParameters >= 2) {
1787 switch (er->ExceptionInformation[0]) {
1788 case 0: st->print(", reading address"); break;
1789 case 1: st->print(", writing address"); break;
1790 case 8: st->print(", data execution prevention violation at address"); break;
1791 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1792 er->ExceptionInformation[0]);
1793 }
1794 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1795 } else {
1796 int num = er->NumberParameters;
1797 if (num > 0) {
1798 st->print(", ExceptionInformation=");
1799 for (int i = 0; i < num; i++) {
1800 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1801 }
1802 }
1803 }
1804 st->cr();
1805 }
1806
1807 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1808 // do nothing
1809 }
1810
1811 static char saved_jvm_path[MAX_PATH] = {0};
1812
1813 // Find the full path to the current module, jvm.dll
1814 void os::jvm_path(char *buf, jint buflen) {
1815 // Error checking.
1816 if (buflen < MAX_PATH) {
1817 assert(false, "must use a large-enough buffer");
1818 buf[0] = '\0';
1819 return;
1820 }
1821 // Lazy resolve the path to current module.
1822 if (saved_jvm_path[0] != 0) {
1823 strcpy(buf, saved_jvm_path);
1824 return;
1825 }
1826
1827 buf[0] = '\0';
1828 if (Arguments::sun_java_launcher_is_altjvm()) {
1829 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1830 // for a JAVA_HOME environment variable and fix up the path so it
1831 // looks like jvm.dll is installed there (append a fake suffix
1832 // hotspot/jvm.dll).
1833 char* java_home_var = ::getenv("JAVA_HOME");
1834 if (java_home_var != NULL && java_home_var[0] != 0 &&
1835 strlen(java_home_var) < (size_t)buflen) {
1836 strncpy(buf, java_home_var, buflen);
1837
1838 // determine if this is a legacy image or modules image
1839 // modules image doesn't have "jre" subdirectory
1840 size_t len = strlen(buf);
1841 char* jrebin_p = buf + len;
1842 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1843 if (0 != _access(buf, 0)) {
1844 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1845 }
1846 len = strlen(buf);
1847 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1848 }
1849 }
1850
1851 if (buf[0] == '\0') {
1852 GetModuleFileName(vm_lib_handle, buf, buflen);
1853 }
1854 strncpy(saved_jvm_path, buf, MAX_PATH);
1855 saved_jvm_path[MAX_PATH - 1] = '\0';
1856 }
1857
1858
1859 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1860 #ifndef _WIN64
1861 st->print("_");
1862 #endif
1863 }
1864
1865
1866 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1867 #ifndef _WIN64
1868 st->print("@%d", args_size * sizeof(int));
1869 #endif
1870 }
1871
1872 // This method is a copy of JDK's sysGetLastErrorString
1873 // from src/windows/hpi/src/system_md.c
1874
1875 size_t os::lasterror(char* buf, size_t len) {
1876 DWORD errval;
1877
1878 if ((errval = GetLastError()) != 0) {
1879 // DOS error
1880 size_t n = (size_t)FormatMessage(
1881 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1882 NULL,
1883 errval,
1884 0,
1885 buf,
1886 (DWORD)len,
1887 NULL);
1888 if (n > 3) {
1889 // Drop final '.', CR, LF
1890 if (buf[n - 1] == '\n') n--;
1891 if (buf[n - 1] == '\r') n--;
1892 if (buf[n - 1] == '.') n--;
1893 buf[n] = '\0';
1894 }
1895 return n;
1896 }
1897
1898 if (errno != 0) {
1899 // C runtime error that has no corresponding DOS error code
1900 const char* s = os::strerror(errno);
1901 size_t n = strlen(s);
1902 if (n >= len) n = len - 1;
1903 strncpy(buf, s, n);
1904 buf[n] = '\0';
1905 return n;
1906 }
1907
1908 return 0;
1909 }
1910
1911 int os::get_last_error() {
1912 DWORD error = GetLastError();
1913 if (error == 0) {
1914 error = errno;
1915 }
1916 return (int)error;
1917 }
1918
1919 WindowsSemaphore::WindowsSemaphore(uint value) {
1920 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1921
1922 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1923 }
1924
1925 WindowsSemaphore::~WindowsSemaphore() {
1926 ::CloseHandle(_semaphore);
1927 }
1928
1929 void WindowsSemaphore::signal(uint count) {
1930 if (count > 0) {
1931 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1932
1933 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1934 }
1935 }
1936
1937 void WindowsSemaphore::wait() {
1938 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1939 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1940 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1941 }
1942
1943 // sun.misc.Signal
1944 // NOTE that this is a workaround for an apparent kernel bug where if
1945 // a signal handler for SIGBREAK is installed then that signal handler
1946 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1947 // See bug 4416763.
1948 static void (*sigbreakHandler)(int) = NULL;
1949
1950 static void UserHandler(int sig, void *siginfo, void *context) {
1951 os::signal_notify(sig);
1952 // We need to reinstate the signal handler each time...
1953 os::signal(sig, (void*)UserHandler);
1954 }
1955
1956 void* os::user_handler() {
1957 return (void*) UserHandler;
1958 }
1959
1960 void* os::signal(int signal_number, void* handler) {
1961 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1962 void (*oldHandler)(int) = sigbreakHandler;
1963 sigbreakHandler = (void (*)(int)) handler;
1964 return (void*) oldHandler;
1965 } else {
1966 return (void*)::signal(signal_number, (void (*)(int))handler);
1967 }
1968 }
1969
1970 void os::signal_raise(int signal_number) {
1971 raise(signal_number);
1972 }
1973
1974 // The Win32 C runtime library maps all console control events other than ^C
1975 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1976 // logoff, and shutdown events. We therefore install our own console handler
1977 // that raises SIGTERM for the latter cases.
1978 //
1979 static BOOL WINAPI consoleHandler(DWORD event) {
1980 switch (event) {
1981 case CTRL_C_EVENT:
1982 if (VMError::is_error_reported()) {
1983 // Ctrl-C is pressed during error reporting, likely because the error
1984 // handler fails to abort. Let VM die immediately.
1985 os::die();
1986 }
1987
1988 os::signal_raise(SIGINT);
1989 return TRUE;
1990 break;
1991 case CTRL_BREAK_EVENT:
1992 if (sigbreakHandler != NULL) {
1993 (*sigbreakHandler)(SIGBREAK);
1994 }
1995 return TRUE;
1996 break;
1997 case CTRL_LOGOFF_EVENT: {
1998 // Don't terminate JVM if it is running in a non-interactive session,
1999 // such as a service process.
2000 USEROBJECTFLAGS flags;
2001 HANDLE handle = GetProcessWindowStation();
2002 if (handle != NULL &&
2003 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2004 sizeof(USEROBJECTFLAGS), NULL)) {
2005 // If it is a non-interactive session, let next handler to deal
2006 // with it.
2007 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2008 return FALSE;
2009 }
2010 }
2011 }
2012 case CTRL_CLOSE_EVENT:
2013 case CTRL_SHUTDOWN_EVENT:
2014 os::signal_raise(SIGTERM);
2015 return TRUE;
2016 break;
2017 default:
2018 break;
2019 }
2020 return FALSE;
2021 }
2022
2023 // The following code is moved from os.cpp for making this
2024 // code platform specific, which it is by its very nature.
2025
2026 // Return maximum OS signal used + 1 for internal use only
2027 // Used as exit signal for signal_thread
2028 int os::sigexitnum_pd() {
2029 return NSIG;
2030 }
2031
2032 // a counter for each possible signal value, including signal_thread exit signal
2033 static volatile jint pending_signals[NSIG+1] = { 0 };
2034 static HANDLE sig_sem = NULL;
2035
2036 void os::signal_init_pd() {
2037 // Initialize signal structures
2038 memset((void*)pending_signals, 0, sizeof(pending_signals));
2039
2040 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2041
2042 // Programs embedding the VM do not want it to attempt to receive
2043 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2044 // shutdown hooks mechanism introduced in 1.3. For example, when
2045 // the VM is run as part of a Windows NT service (i.e., a servlet
2046 // engine in a web server), the correct behavior is for any console
2047 // control handler to return FALSE, not TRUE, because the OS's
2048 // "final" handler for such events allows the process to continue if
2049 // it is a service (while terminating it if it is not a service).
2050 // To make this behavior uniform and the mechanism simpler, we
2051 // completely disable the VM's usage of these console events if -Xrs
2052 // (=ReduceSignalUsage) is specified. This means, for example, that
2053 // the CTRL-BREAK thread dump mechanism is also disabled in this
2054 // case. See bugs 4323062, 4345157, and related bugs.
2055
2056 if (!ReduceSignalUsage) {
2057 // Add a CTRL-C handler
2058 SetConsoleCtrlHandler(consoleHandler, TRUE);
2059 }
2060 }
2061
2062 void os::signal_notify(int signal_number) {
2063 BOOL ret;
2064 if (sig_sem != NULL) {
2065 Atomic::inc(&pending_signals[signal_number]);
2066 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2067 assert(ret != 0, "ReleaseSemaphore() failed");
2068 }
2069 }
2070
2071 static int check_pending_signals(bool wait_for_signal) {
2072 DWORD ret;
2073 while (true) {
2074 for (int i = 0; i < NSIG + 1; i++) {
2075 jint n = pending_signals[i];
2076 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2077 return i;
2078 }
2079 }
2080 if (!wait_for_signal) {
2081 return -1;
2082 }
2083
2084 JavaThread *thread = JavaThread::current();
2085
2086 ThreadBlockInVM tbivm(thread);
2087
2088 bool threadIsSuspended;
2089 do {
2090 thread->set_suspend_equivalent();
2091 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2092 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2093 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2094
2095 // were we externally suspended while we were waiting?
2096 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2097 if (threadIsSuspended) {
2098 // The semaphore has been incremented, but while we were waiting
2099 // another thread suspended us. We don't want to continue running
2100 // while suspended because that would surprise the thread that
2101 // suspended us.
2102 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2103 assert(ret != 0, "ReleaseSemaphore() failed");
2104
2105 thread->java_suspend_self();
2106 }
2107 } while (threadIsSuspended);
2108 }
2109 }
2110
2111 int os::signal_lookup() {
2112 return check_pending_signals(false);
2113 }
2114
2115 int os::signal_wait() {
2116 return check_pending_signals(true);
2117 }
2118
2119 // Implicit OS exception handling
2120
2121 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2122 address handler) {
2123 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2124 // Save pc in thread
2125 #ifdef _M_AMD64
2126 // Do not blow up if no thread info available.
2127 if (thread) {
2128 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2129 }
2130 // Set pc to handler
2131 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2132 #else
2133 // Do not blow up if no thread info available.
2134 if (thread) {
2135 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2136 }
2137 // Set pc to handler
2138 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2139 #endif
2140
2141 // Continue the execution
2142 return EXCEPTION_CONTINUE_EXECUTION;
2143 }
2144
2145
2146 // Used for PostMortemDump
2147 extern "C" void safepoints();
2148 extern "C" void find(int x);
2149 extern "C" void events();
2150
2151 // According to Windows API documentation, an illegal instruction sequence should generate
2152 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2153 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2154 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2155
2156 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2157
2158 // From "Execution Protection in the Windows Operating System" draft 0.35
2159 // Once a system header becomes available, the "real" define should be
2160 // included or copied here.
2161 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2162
2163 // Windows Vista/2008 heap corruption check
2164 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2165
2166 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2167 // C++ compiler contain this error code. Because this is a compiler-generated
2168 // error, the code is not listed in the Win32 API header files.
2169 // The code is actually a cryptic mnemonic device, with the initial "E"
2170 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2171 // ASCII values of "msc".
2172
2173 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2174
2175 #define def_excpt(val) { #val, (val) }
2176
2177 static const struct { char* name; uint number; } exceptlabels[] = {
2178 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2179 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2180 def_excpt(EXCEPTION_BREAKPOINT),
2181 def_excpt(EXCEPTION_SINGLE_STEP),
2182 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2183 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2184 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2185 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2186 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2187 def_excpt(EXCEPTION_FLT_OVERFLOW),
2188 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2189 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2190 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2191 def_excpt(EXCEPTION_INT_OVERFLOW),
2192 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2193 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2194 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2195 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2196 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2197 def_excpt(EXCEPTION_STACK_OVERFLOW),
2198 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2199 def_excpt(EXCEPTION_GUARD_PAGE),
2200 def_excpt(EXCEPTION_INVALID_HANDLE),
2201 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2202 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2203 };
2204
2205 #undef def_excpt
2206
2207 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2208 uint code = static_cast<uint>(exception_code);
2209 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2210 if (exceptlabels[i].number == code) {
2211 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2212 return buf;
2213 }
2214 }
2215
2216 return NULL;
2217 }
2218
2219 //-----------------------------------------------------------------------------
2220 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2221 // handle exception caused by idiv; should only happen for -MinInt/-1
2222 // (division by zero is handled explicitly)
2223 #ifdef _M_AMD64
2224 PCONTEXT ctx = exceptionInfo->ContextRecord;
2225 address pc = (address)ctx->Rip;
2226 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2227 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2228 if (pc[0] == 0xF7) {
2229 // set correct result values and continue after idiv instruction
2230 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2231 } else {
2232 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2233 }
2234 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2235 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2236 // idiv opcode (0xF7).
2237 ctx->Rdx = (DWORD)0; // remainder
2238 // Continue the execution
2239 #else
2240 PCONTEXT ctx = exceptionInfo->ContextRecord;
2241 address pc = (address)ctx->Eip;
2242 assert(pc[0] == 0xF7, "not an idiv opcode");
2243 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2244 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2245 // set correct result values and continue after idiv instruction
2246 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2247 ctx->Eax = (DWORD)min_jint; // result
2248 ctx->Edx = (DWORD)0; // remainder
2249 // Continue the execution
2250 #endif
2251 return EXCEPTION_CONTINUE_EXECUTION;
2252 }
2253
2254 //-----------------------------------------------------------------------------
2255 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2256 PCONTEXT ctx = exceptionInfo->ContextRecord;
2257 #ifndef _WIN64
2258 // handle exception caused by native method modifying control word
2259 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2260
2261 switch (exception_code) {
2262 case EXCEPTION_FLT_DENORMAL_OPERAND:
2263 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2264 case EXCEPTION_FLT_INEXACT_RESULT:
2265 case EXCEPTION_FLT_INVALID_OPERATION:
2266 case EXCEPTION_FLT_OVERFLOW:
2267 case EXCEPTION_FLT_STACK_CHECK:
2268 case EXCEPTION_FLT_UNDERFLOW:
2269 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2270 if (fp_control_word != ctx->FloatSave.ControlWord) {
2271 // Restore FPCW and mask out FLT exceptions
2272 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2273 // Mask out pending FLT exceptions
2274 ctx->FloatSave.StatusWord &= 0xffffff00;
2275 return EXCEPTION_CONTINUE_EXECUTION;
2276 }
2277 }
2278
2279 if (prev_uef_handler != NULL) {
2280 // We didn't handle this exception so pass it to the previous
2281 // UnhandledExceptionFilter.
2282 return (prev_uef_handler)(exceptionInfo);
2283 }
2284 #else // !_WIN64
2285 // On Windows, the mxcsr control bits are non-volatile across calls
2286 // See also CR 6192333
2287 //
2288 jint MxCsr = INITIAL_MXCSR;
2289 // we can't use StubRoutines::addr_mxcsr_std()
2290 // because in Win64 mxcsr is not saved there
2291 if (MxCsr != ctx->MxCsr) {
2292 ctx->MxCsr = MxCsr;
2293 return EXCEPTION_CONTINUE_EXECUTION;
2294 }
2295 #endif // !_WIN64
2296
2297 return EXCEPTION_CONTINUE_SEARCH;
2298 }
2299
2300 static inline void report_error(Thread* t, DWORD exception_code,
2301 address addr, void* siginfo, void* context) {
2302 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2303
2304 // If UseOsErrorReporting, this will return here and save the error file
2305 // somewhere where we can find it in the minidump.
2306 }
2307
2308 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2309 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2310 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2311 address addr = (address) exceptionRecord->ExceptionInformation[1];
2312 if (Interpreter::contains(pc)) {
2313 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2314 if (!fr->is_first_java_frame()) {
2315 // get_frame_at_stack_banging_point() is only called when we
2316 // have well defined stacks so java_sender() calls do not need
2317 // to assert safe_for_sender() first.
2318 *fr = fr->java_sender();
2319 }
2320 } else {
2321 // more complex code with compiled code
2322 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2323 CodeBlob* cb = CodeCache::find_blob(pc);
2324 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2325 // Not sure where the pc points to, fallback to default
2326 // stack overflow handling
2327 return false;
2328 } else {
2329 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2330 // in compiled code, the stack banging is performed just after the return pc
2331 // has been pushed on the stack
2332 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2333 if (!fr->is_java_frame()) {
2334 // See java_sender() comment above.
2335 *fr = fr->java_sender();
2336 }
2337 }
2338 }
2339 assert(fr->is_java_frame(), "Safety check");
2340 return true;
2341 }
2342
2343 //-----------------------------------------------------------------------------
2344 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2345 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2346 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2347 #ifdef _M_AMD64
2348 address pc = (address) exceptionInfo->ContextRecord->Rip;
2349 #else
2350 address pc = (address) exceptionInfo->ContextRecord->Eip;
2351 #endif
2352 Thread* t = Thread::current_or_null_safe();
2353
2354 // Handle SafeFetch32 and SafeFetchN exceptions.
2355 if (StubRoutines::is_safefetch_fault(pc)) {
2356 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2357 }
2358
2359 #ifndef _WIN64
2360 // Execution protection violation - win32 running on AMD64 only
2361 // Handled first to avoid misdiagnosis as a "normal" access violation;
2362 // This is safe to do because we have a new/unique ExceptionInformation
2363 // code for this condition.
2364 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2365 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2366 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2367 address addr = (address) exceptionRecord->ExceptionInformation[1];
2368
2369 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2370 int page_size = os::vm_page_size();
2371
2372 // Make sure the pc and the faulting address are sane.
2373 //
2374 // If an instruction spans a page boundary, and the page containing
2375 // the beginning of the instruction is executable but the following
2376 // page is not, the pc and the faulting address might be slightly
2377 // different - we still want to unguard the 2nd page in this case.
2378 //
2379 // 15 bytes seems to be a (very) safe value for max instruction size.
2380 bool pc_is_near_addr =
2381 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2382 bool instr_spans_page_boundary =
2383 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2384 (intptr_t) page_size) > 0);
2385
2386 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2387 static volatile address last_addr =
2388 (address) os::non_memory_address_word();
2389
2390 // In conservative mode, don't unguard unless the address is in the VM
2391 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2392 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2393
2394 // Set memory to RWX and retry
2395 address page_start =
2396 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2397 bool res = os::protect_memory((char*) page_start, page_size,
2398 os::MEM_PROT_RWX);
2399
2400 log_debug(os)("Execution protection violation "
2401 "at " INTPTR_FORMAT
2402 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2403 p2i(page_start), (res ? "success" : os::strerror(errno)));
2404
2405 // Set last_addr so if we fault again at the same address, we don't
2406 // end up in an endless loop.
2407 //
2408 // There are two potential complications here. Two threads trapping
2409 // at the same address at the same time could cause one of the
2410 // threads to think it already unguarded, and abort the VM. Likely
2411 // very rare.
2412 //
2413 // The other race involves two threads alternately trapping at
2414 // different addresses and failing to unguard the page, resulting in
2415 // an endless loop. This condition is probably even more unlikely
2416 // than the first.
2417 //
2418 // Although both cases could be avoided by using locks or thread
2419 // local last_addr, these solutions are unnecessary complication:
2420 // this handler is a best-effort safety net, not a complete solution.
2421 // It is disabled by default and should only be used as a workaround
2422 // in case we missed any no-execute-unsafe VM code.
2423
2424 last_addr = addr;
2425
2426 return EXCEPTION_CONTINUE_EXECUTION;
2427 }
2428 }
2429
2430 // Last unguard failed or not unguarding
2431 tty->print_raw_cr("Execution protection violation");
2432 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2433 exceptionInfo->ContextRecord);
2434 return EXCEPTION_CONTINUE_SEARCH;
2435 }
2436 }
2437 #endif // _WIN64
2438
2439 // Check to see if we caught the safepoint code in the
2440 // process of write protecting the memory serialization page.
2441 // It write enables the page immediately after protecting it
2442 // so just return.
2443 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2444 if (t != NULL && t->is_Java_thread()) {
2445 JavaThread* thread = (JavaThread*) t;
2446 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2447 address addr = (address) exceptionRecord->ExceptionInformation[1];
2448 if (os::is_memory_serialize_page(thread, addr)) {
2449 // Block current thread until the memory serialize page permission restored.
2450 os::block_on_serialize_page_trap();
2451 return EXCEPTION_CONTINUE_EXECUTION;
2452 }
2453 }
2454 }
2455
2456 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2457 VM_Version::is_cpuinfo_segv_addr(pc)) {
2458 // Verify that OS save/restore AVX registers.
2459 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2460 }
2461
2462 if (t != NULL && t->is_Java_thread()) {
2463 JavaThread* thread = (JavaThread*) t;
2464 bool in_java = thread->thread_state() == _thread_in_Java;
2465
2466 // Handle potential stack overflows up front.
2467 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2468 if (thread->stack_guards_enabled()) {
2469 if (in_java) {
2470 frame fr;
2471 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2472 address addr = (address) exceptionRecord->ExceptionInformation[1];
2473 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2474 assert(fr.is_java_frame(), "Must be a Java frame");
2475 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2476 }
2477 }
2478 // Yellow zone violation. The o/s has unprotected the first yellow
2479 // zone page for us. Note: must call disable_stack_yellow_zone to
2480 // update the enabled status, even if the zone contains only one page.
2481 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2482 thread->disable_stack_yellow_reserved_zone();
2483 // If not in java code, return and hope for the best.
2484 return in_java
2485 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2486 : EXCEPTION_CONTINUE_EXECUTION;
2487 } else {
2488 // Fatal red zone violation.
2489 thread->disable_stack_red_zone();
2490 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2491 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2492 exceptionInfo->ContextRecord);
2493 return EXCEPTION_CONTINUE_SEARCH;
2494 }
2495 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2496 // Either stack overflow or null pointer exception.
2497 if (in_java) {
2498 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2499 address addr = (address) exceptionRecord->ExceptionInformation[1];
2500 address stack_end = thread->stack_end();
2501 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2502 // Stack overflow.
2503 assert(!os::uses_stack_guard_pages(),
2504 "should be caught by red zone code above.");
2505 return Handle_Exception(exceptionInfo,
2506 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2507 }
2508 // Check for safepoint polling and implicit null
2509 // We only expect null pointers in the stubs (vtable)
2510 // the rest are checked explicitly now.
2511 CodeBlob* cb = CodeCache::find_blob(pc);
2512 if (cb != NULL) {
2513 if (os::is_poll_address(addr)) {
2514 address stub = SharedRuntime::get_poll_stub(pc);
2515 return Handle_Exception(exceptionInfo, stub);
2516 }
2517 }
2518 {
2519 #ifdef _WIN64
2520 // If it's a legal stack address map the entire region in
2521 //
2522 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2523 address addr = (address) exceptionRecord->ExceptionInformation[1];
2524 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2525 addr = (address)((uintptr_t)addr &
2526 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2527 os::commit_memory((char *)addr, thread->stack_base() - addr,
2528 !ExecMem);
2529 return EXCEPTION_CONTINUE_EXECUTION;
2530 } else
2531 #endif
2532 {
2533 // Null pointer exception.
2534 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2535 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2536 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2537 }
2538 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2539 exceptionInfo->ContextRecord);
2540 return EXCEPTION_CONTINUE_SEARCH;
2541 }
2542 }
2543 }
2544
2545 #ifdef _WIN64
2546 // Special care for fast JNI field accessors.
2547 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2548 // in and the heap gets shrunk before the field access.
2549 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2550 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2551 if (addr != (address)-1) {
2552 return Handle_Exception(exceptionInfo, addr);
2553 }
2554 }
2555 #endif
2556
2557 // Stack overflow or null pointer exception in native code.
2558 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2559 exceptionInfo->ContextRecord);
2560 return EXCEPTION_CONTINUE_SEARCH;
2561 } // /EXCEPTION_ACCESS_VIOLATION
2562 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2563
2564 if (in_java) {
2565 switch (exception_code) {
2566 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2567 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2568
2569 case EXCEPTION_INT_OVERFLOW:
2570 return Handle_IDiv_Exception(exceptionInfo);
2571
2572 } // switch
2573 }
2574 if (((thread->thread_state() == _thread_in_Java) ||
2575 (thread->thread_state() == _thread_in_native)) &&
2576 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2577 LONG result=Handle_FLT_Exception(exceptionInfo);
2578 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2579 }
2580 }
2581
2582 if (exception_code != EXCEPTION_BREAKPOINT) {
2583 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2584 exceptionInfo->ContextRecord);
2585 }
2586 return EXCEPTION_CONTINUE_SEARCH;
2587 }
2588
2589 #ifndef _WIN64
2590 // Special care for fast JNI accessors.
2591 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2592 // the heap gets shrunk before the field access.
2593 // Need to install our own structured exception handler since native code may
2594 // install its own.
2595 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2596 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2597 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2598 address pc = (address) exceptionInfo->ContextRecord->Eip;
2599 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2600 if (addr != (address)-1) {
2601 return Handle_Exception(exceptionInfo, addr);
2602 }
2603 }
2604 return EXCEPTION_CONTINUE_SEARCH;
2605 }
2606
2607 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2608 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2609 jobject obj, \
2610 jfieldID fieldID) { \
2611 __try { \
2612 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2613 obj, \
2614 fieldID); \
2615 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2616 _exception_info())) { \
2617 } \
2618 return 0; \
2619 }
2620
2621 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2622 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2623 DEFINE_FAST_GETFIELD(jchar, char, Char)
2624 DEFINE_FAST_GETFIELD(jshort, short, Short)
2625 DEFINE_FAST_GETFIELD(jint, int, Int)
2626 DEFINE_FAST_GETFIELD(jlong, long, Long)
2627 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2628 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2629
2630 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2631 switch (type) {
2632 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2633 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2634 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2635 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2636 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2637 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2638 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2639 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2640 default: ShouldNotReachHere();
2641 }
2642 return (address)-1;
2643 }
2644 #endif
2645
2646 // Virtual Memory
2647
2648 int os::vm_page_size() { return os::win32::vm_page_size(); }
2649 int os::vm_allocation_granularity() {
2650 return os::win32::vm_allocation_granularity();
2651 }
2652
2653 // Windows large page support is available on Windows 2003. In order to use
2654 // large page memory, the administrator must first assign additional privilege
2655 // to the user:
2656 // + select Control Panel -> Administrative Tools -> Local Security Policy
2657 // + select Local Policies -> User Rights Assignment
2658 // + double click "Lock pages in memory", add users and/or groups
2659 // + reboot
2660 // Note the above steps are needed for administrator as well, as administrators
2661 // by default do not have the privilege to lock pages in memory.
2662 //
2663 // Note about Windows 2003: although the API supports committing large page
2664 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2665 // scenario, I found through experiment it only uses large page if the entire
2666 // memory region is reserved and committed in a single VirtualAlloc() call.
2667 // This makes Windows large page support more or less like Solaris ISM, in
2668 // that the entire heap must be committed upfront. This probably will change
2669 // in the future, if so the code below needs to be revisited.
2670
2671 #ifndef MEM_LARGE_PAGES
2672 #define MEM_LARGE_PAGES 0x20000000
2673 #endif
2674
2675 static HANDLE _hProcess;
2676 static HANDLE _hToken;
2677
2678 // Container for NUMA node list info
2679 class NUMANodeListHolder {
2680 private:
2681 int *_numa_used_node_list; // allocated below
2682 int _numa_used_node_count;
2683
2684 void free_node_list() {
2685 if (_numa_used_node_list != NULL) {
2686 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2687 }
2688 }
2689
2690 public:
2691 NUMANodeListHolder() {
2692 _numa_used_node_count = 0;
2693 _numa_used_node_list = NULL;
2694 // do rest of initialization in build routine (after function pointers are set up)
2695 }
2696
2697 ~NUMANodeListHolder() {
2698 free_node_list();
2699 }
2700
2701 bool build() {
2702 DWORD_PTR proc_aff_mask;
2703 DWORD_PTR sys_aff_mask;
2704 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2705 ULONG highest_node_number;
2706 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2707 free_node_list();
2708 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2709 for (unsigned int i = 0; i <= highest_node_number; i++) {
2710 ULONGLONG proc_mask_numa_node;
2711 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2712 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2713 _numa_used_node_list[_numa_used_node_count++] = i;
2714 }
2715 }
2716 return (_numa_used_node_count > 1);
2717 }
2718
2719 int get_count() { return _numa_used_node_count; }
2720 int get_node_list_entry(int n) {
2721 // for indexes out of range, returns -1
2722 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2723 }
2724
2725 } numa_node_list_holder;
2726
2727
2728
2729 static size_t _large_page_size = 0;
2730
2731 static bool request_lock_memory_privilege() {
2732 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2733 os::current_process_id());
2734
2735 LUID luid;
2736 if (_hProcess != NULL &&
2737 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2738 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2739
2740 TOKEN_PRIVILEGES tp;
2741 tp.PrivilegeCount = 1;
2742 tp.Privileges[0].Luid = luid;
2743 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2744
2745 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2746 // privilege. Check GetLastError() too. See MSDN document.
2747 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2748 (GetLastError() == ERROR_SUCCESS)) {
2749 return true;
2750 }
2751 }
2752
2753 return false;
2754 }
2755
2756 static void cleanup_after_large_page_init() {
2757 if (_hProcess) CloseHandle(_hProcess);
2758 _hProcess = NULL;
2759 if (_hToken) CloseHandle(_hToken);
2760 _hToken = NULL;
2761 }
2762
2763 static bool numa_interleaving_init() {
2764 bool success = false;
2765 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2766
2767 // print a warning if UseNUMAInterleaving flag is specified on command line
2768 bool warn_on_failure = use_numa_interleaving_specified;
2769 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2770
2771 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2772 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2773 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2774
2775 if (numa_node_list_holder.build()) {
2776 if (log_is_enabled(Debug, os, cpu)) {
2777 Log(os, cpu) log;
2778 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2779 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2780 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2781 }
2782 }
2783 success = true;
2784 } else {
2785 WARN("Process does not cover multiple NUMA nodes.");
2786 }
2787 if (!success) {
2788 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2789 }
2790 return success;
2791 #undef WARN
2792 }
2793
2794 // this routine is used whenever we need to reserve a contiguous VA range
2795 // but we need to make separate VirtualAlloc calls for each piece of the range
2796 // Reasons for doing this:
2797 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2798 // * UseNUMAInterleaving requires a separate node for each piece
2799 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2800 DWORD prot,
2801 bool should_inject_error = false) {
2802 char * p_buf;
2803 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2804 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2805 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2806
2807 // first reserve enough address space in advance since we want to be
2808 // able to break a single contiguous virtual address range into multiple
2809 // large page commits but WS2003 does not allow reserving large page space
2810 // so we just use 4K pages for reserve, this gives us a legal contiguous
2811 // address space. then we will deallocate that reservation, and re alloc
2812 // using large pages
2813 const size_t size_of_reserve = bytes + chunk_size;
2814 if (bytes > size_of_reserve) {
2815 // Overflowed.
2816 return NULL;
2817 }
2818 p_buf = (char *) VirtualAlloc(addr,
2819 size_of_reserve, // size of Reserve
2820 MEM_RESERVE,
2821 PAGE_READWRITE);
2822 // If reservation failed, return NULL
2823 if (p_buf == NULL) return NULL;
2824 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2825 os::release_memory(p_buf, bytes + chunk_size);
2826
2827 // we still need to round up to a page boundary (in case we are using large pages)
2828 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2829 // instead we handle this in the bytes_to_rq computation below
2830 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2831
2832 // now go through and allocate one chunk at a time until all bytes are
2833 // allocated
2834 size_t bytes_remaining = bytes;
2835 // An overflow of align_size_up() would have been caught above
2836 // in the calculation of size_of_reserve.
2837 char * next_alloc_addr = p_buf;
2838 HANDLE hProc = GetCurrentProcess();
2839
2840 #ifdef ASSERT
2841 // Variable for the failure injection
2842 long ran_num = os::random();
2843 size_t fail_after = ran_num % bytes;
2844 #endif
2845
2846 int count=0;
2847 while (bytes_remaining) {
2848 // select bytes_to_rq to get to the next chunk_size boundary
2849
2850 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2851 // Note allocate and commit
2852 char * p_new;
2853
2854 #ifdef ASSERT
2855 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2856 #else
2857 const bool inject_error_now = false;
2858 #endif
2859
2860 if (inject_error_now) {
2861 p_new = NULL;
2862 } else {
2863 if (!UseNUMAInterleaving) {
2864 p_new = (char *) VirtualAlloc(next_alloc_addr,
2865 bytes_to_rq,
2866 flags,
2867 prot);
2868 } else {
2869 // get the next node to use from the used_node_list
2870 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2871 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2872 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2873 }
2874 }
2875
2876 if (p_new == NULL) {
2877 // Free any allocated pages
2878 if (next_alloc_addr > p_buf) {
2879 // Some memory was committed so release it.
2880 size_t bytes_to_release = bytes - bytes_remaining;
2881 // NMT has yet to record any individual blocks, so it
2882 // need to create a dummy 'reserve' record to match
2883 // the release.
2884 MemTracker::record_virtual_memory_reserve((address)p_buf,
2885 bytes_to_release, CALLER_PC);
2886 os::release_memory(p_buf, bytes_to_release);
2887 }
2888 #ifdef ASSERT
2889 if (should_inject_error) {
2890 log_develop_debug(pagesize)("Reserving pages individually failed.");
2891 }
2892 #endif
2893 return NULL;
2894 }
2895
2896 bytes_remaining -= bytes_to_rq;
2897 next_alloc_addr += bytes_to_rq;
2898 count++;
2899 }
2900 // Although the memory is allocated individually, it is returned as one.
2901 // NMT records it as one block.
2902 if ((flags & MEM_COMMIT) != 0) {
2903 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2904 } else {
2905 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2906 }
2907
2908 // made it this far, success
2909 return p_buf;
2910 }
2911
2912
2913
2914 void os::large_page_init() {
2915 if (!UseLargePages) return;
2916
2917 // print a warning if any large page related flag is specified on command line
2918 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2919 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2920 bool success = false;
2921
2922 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2923 if (request_lock_memory_privilege()) {
2924 size_t s = GetLargePageMinimum();
2925 if (s) {
2926 #if defined(IA32) || defined(AMD64)
2927 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2928 WARN("JVM cannot use large pages bigger than 4mb.");
2929 } else {
2930 #endif
2931 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2932 _large_page_size = LargePageSizeInBytes;
2933 } else {
2934 _large_page_size = s;
2935 }
2936 success = true;
2937 #if defined(IA32) || defined(AMD64)
2938 }
2939 #endif
2940 } else {
2941 WARN("Large page is not supported by the processor.");
2942 }
2943 } else {
2944 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2945 }
2946 #undef WARN
2947
2948 const size_t default_page_size = (size_t) vm_page_size();
2949 if (success && _large_page_size > default_page_size) {
2950 _page_sizes[0] = _large_page_size;
2951 _page_sizes[1] = default_page_size;
2952 _page_sizes[2] = 0;
2953 }
2954
2955 cleanup_after_large_page_init();
2956 UseLargePages = success;
2957 }
2958
2959 // On win32, one cannot release just a part of reserved memory, it's an
2960 // all or nothing deal. When we split a reservation, we must break the
2961 // reservation into two reservations.
2962 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2963 bool realloc) {
2964 if (size > 0) {
2965 release_memory(base, size);
2966 if (realloc) {
2967 reserve_memory(split, base);
2968 }
2969 if (size != split) {
2970 reserve_memory(size - split, base + split);
2971 }
2972 }
2973 }
2974
2975 // Multiple threads can race in this code but it's not possible to unmap small sections of
2976 // virtual space to get requested alignment, like posix-like os's.
2977 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
2978 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
2979 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
2980 "Alignment must be a multiple of allocation granularity (page size)");
2981 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
2982
2983 size_t extra_size = size + alignment;
2984 assert(extra_size >= size, "overflow, size is too large to allow alignment");
2985
2986 char* aligned_base = NULL;
2987
2988 do {
2989 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
2990 if (extra_base == NULL) {
2991 return NULL;
2992 }
2993 // Do manual alignment
2994 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
2995
2996 os::release_memory(extra_base, extra_size);
2997
2998 aligned_base = os::reserve_memory(size, aligned_base);
2999
3000 } while (aligned_base == NULL);
3001
3002 return aligned_base;
3003 }
3004
3005 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3006 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3007 "reserve alignment");
3008 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3009 char* res;
3010 // note that if UseLargePages is on, all the areas that require interleaving
3011 // will go thru reserve_memory_special rather than thru here.
3012 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3013 if (!use_individual) {
3014 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3015 } else {
3016 elapsedTimer reserveTimer;
3017 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3018 // in numa interleaving, we have to allocate pages individually
3019 // (well really chunks of NUMAInterleaveGranularity size)
3020 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3021 if (res == NULL) {
3022 warning("NUMA page allocation failed");
3023 }
3024 if (Verbose && PrintMiscellaneous) {
3025 reserveTimer.stop();
3026 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3027 reserveTimer.milliseconds(), reserveTimer.ticks());
3028 }
3029 }
3030 assert(res == NULL || addr == NULL || addr == res,
3031 "Unexpected address from reserve.");
3032
3033 return res;
3034 }
3035
3036 // Reserve memory at an arbitrary address, only if that area is
3037 // available (and not reserved for something else).
3038 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3039 // Windows os::reserve_memory() fails of the requested address range is
3040 // not avilable.
3041 return reserve_memory(bytes, requested_addr);
3042 }
3043
3044 size_t os::large_page_size() {
3045 return _large_page_size;
3046 }
3047
3048 bool os::can_commit_large_page_memory() {
3049 // Windows only uses large page memory when the entire region is reserved
3050 // and committed in a single VirtualAlloc() call. This may change in the
3051 // future, but with Windows 2003 it's not possible to commit on demand.
3052 return false;
3053 }
3054
3055 bool os::can_execute_large_page_memory() {
3056 return true;
3057 }
3058
3059 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3060 bool exec) {
3061 assert(UseLargePages, "only for large pages");
3062
3063 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3064 return NULL; // Fallback to small pages.
3065 }
3066
3067 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3068 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3069
3070 // with large pages, there are two cases where we need to use Individual Allocation
3071 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3072 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3073 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3074 log_debug(pagesize)("Reserving large pages individually.");
3075
3076 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3077 if (p_buf == NULL) {
3078 // give an appropriate warning message
3079 if (UseNUMAInterleaving) {
3080 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3081 }
3082 if (UseLargePagesIndividualAllocation) {
3083 warning("Individually allocated large pages failed, "
3084 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3085 }
3086 return NULL;
3087 }
3088
3089 return p_buf;
3090
3091 } else {
3092 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3093
3094 // normal policy just allocate it all at once
3095 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3096 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3097 if (res != NULL) {
3098 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3099 }
3100
3101 return res;
3102 }
3103 }
3104
3105 bool os::release_memory_special(char* base, size_t bytes) {
3106 assert(base != NULL, "Sanity check");
3107 return release_memory(base, bytes);
3108 }
3109
3110 void os::print_statistics() {
3111 }
3112
3113 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3114 int err = os::get_last_error();
3115 char buf[256];
3116 size_t buf_len = os::lasterror(buf, sizeof(buf));
3117 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3118 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3119 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3120 }
3121
3122 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3123 if (bytes == 0) {
3124 // Don't bother the OS with noops.
3125 return true;
3126 }
3127 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3128 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3129 // Don't attempt to print anything if the OS call fails. We're
3130 // probably low on resources, so the print itself may cause crashes.
3131
3132 // unless we have NUMAInterleaving enabled, the range of a commit
3133 // is always within a reserve covered by a single VirtualAlloc
3134 // in that case we can just do a single commit for the requested size
3135 if (!UseNUMAInterleaving) {
3136 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3137 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3138 return false;
3139 }
3140 if (exec) {
3141 DWORD oldprot;
3142 // Windows doc says to use VirtualProtect to get execute permissions
3143 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3144 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3145 return false;
3146 }
3147 }
3148 return true;
3149 } else {
3150
3151 // when NUMAInterleaving is enabled, the commit might cover a range that
3152 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3153 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3154 // returns represents the number of bytes that can be committed in one step.
3155 size_t bytes_remaining = bytes;
3156 char * next_alloc_addr = addr;
3157 while (bytes_remaining > 0) {
3158 MEMORY_BASIC_INFORMATION alloc_info;
3159 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3160 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3161 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3162 PAGE_READWRITE) == NULL) {
3163 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3164 exec);)
3165 return false;
3166 }
3167 if (exec) {
3168 DWORD oldprot;
3169 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3170 PAGE_EXECUTE_READWRITE, &oldprot)) {
3171 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3172 exec);)
3173 return false;
3174 }
3175 }
3176 bytes_remaining -= bytes_to_rq;
3177 next_alloc_addr += bytes_to_rq;
3178 }
3179 }
3180 // if we made it this far, return true
3181 return true;
3182 }
3183
3184 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3185 bool exec) {
3186 // alignment_hint is ignored on this OS
3187 return pd_commit_memory(addr, size, exec);
3188 }
3189
3190 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3191 const char* mesg) {
3192 assert(mesg != NULL, "mesg must be specified");
3193 if (!pd_commit_memory(addr, size, exec)) {
3194 warn_fail_commit_memory(addr, size, exec);
3195 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3196 }
3197 }
3198
3199 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3200 size_t alignment_hint, bool exec,
3201 const char* mesg) {
3202 // alignment_hint is ignored on this OS
3203 pd_commit_memory_or_exit(addr, size, exec, mesg);
3204 }
3205
3206 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3207 if (bytes == 0) {
3208 // Don't bother the OS with noops.
3209 return true;
3210 }
3211 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3212 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3213 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3214 }
3215
3216 bool os::pd_release_memory(char* addr, size_t bytes) {
3217 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3218 }
3219
3220 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3221 return os::commit_memory(addr, size, !ExecMem);
3222 }
3223
3224 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3225 return os::uncommit_memory(addr, size);
3226 }
3227
3228 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3229 uint count = 0;
3230 bool ret = false;
3231 size_t bytes_remaining = bytes;
3232 char * next_protect_addr = addr;
3233
3234 // Use VirtualQuery() to get the chunk size.
3235 while (bytes_remaining) {
3236 MEMORY_BASIC_INFORMATION alloc_info;
3237 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3238 return false;
3239 }
3240
3241 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3242 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3243 // but we don't distinguish here as both cases are protected by same API.
3244 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3245 warning("Failed protecting pages individually for chunk #%u", count);
3246 if (!ret) {
3247 return false;
3248 }
3249
3250 bytes_remaining -= bytes_to_protect;
3251 next_protect_addr += bytes_to_protect;
3252 count++;
3253 }
3254 return ret;
3255 }
3256
3257 // Set protections specified
3258 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3259 bool is_committed) {
3260 unsigned int p = 0;
3261 switch (prot) {
3262 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3263 case MEM_PROT_READ: p = PAGE_READONLY; break;
3264 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3265 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3266 default:
3267 ShouldNotReachHere();
3268 }
3269
3270 DWORD old_status;
3271
3272 // Strange enough, but on Win32 one can change protection only for committed
3273 // memory, not a big deal anyway, as bytes less or equal than 64K
3274 if (!is_committed) {
3275 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3276 "cannot commit protection page");
3277 }
3278 // One cannot use os::guard_memory() here, as on Win32 guard page
3279 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3280 //
3281 // Pages in the region become guard pages. Any attempt to access a guard page
3282 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3283 // the guard page status. Guard pages thus act as a one-time access alarm.
3284 bool ret;
3285 if (UseNUMAInterleaving) {
3286 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3287 // so we must protect the chunks individually.
3288 ret = protect_pages_individually(addr, bytes, p, &old_status);
3289 } else {
3290 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3291 }
3292 #ifdef ASSERT
3293 if (!ret) {
3294 int err = os::get_last_error();
3295 char buf[256];
3296 size_t buf_len = os::lasterror(buf, sizeof(buf));
3297 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3298 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3299 buf_len != 0 ? buf : "<no_error_string>", err);
3300 }
3301 #endif
3302 return ret;
3303 }
3304
3305 bool os::guard_memory(char* addr, size_t bytes) {
3306 DWORD old_status;
3307 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3308 }
3309
3310 bool os::unguard_memory(char* addr, size_t bytes) {
3311 DWORD old_status;
3312 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3313 }
3314
3315 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3316 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3317 void os::numa_make_global(char *addr, size_t bytes) { }
3318 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3319 bool os::numa_topology_changed() { return false; }
3320 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3321 int os::numa_get_group_id() { return 0; }
3322 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3323 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3324 // Provide an answer for UMA systems
3325 ids[0] = 0;
3326 return 1;
3327 } else {
3328 // check for size bigger than actual groups_num
3329 size = MIN2(size, numa_get_groups_num());
3330 for (int i = 0; i < (int)size; i++) {
3331 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3332 }
3333 return size;
3334 }
3335 }
3336
3337 bool os::get_page_info(char *start, page_info* info) {
3338 return false;
3339 }
3340
3341 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3342 page_info* page_found) {
3343 return end;
3344 }
3345
3346 char* os::non_memory_address_word() {
3347 // Must never look like an address returned by reserve_memory,
3348 // even in its subfields (as defined by the CPU immediate fields,
3349 // if the CPU splits constants across multiple instructions).
3350 return (char*)-1;
3351 }
3352
3353 #define MAX_ERROR_COUNT 100
3354 #define SYS_THREAD_ERROR 0xffffffffUL
3355
3356 void os::pd_start_thread(Thread* thread) {
3357 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3358 // Returns previous suspend state:
3359 // 0: Thread was not suspended
3360 // 1: Thread is running now
3361 // >1: Thread is still suspended.
3362 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3363 }
3364
3365 class HighResolutionInterval : public CHeapObj<mtThread> {
3366 // The default timer resolution seems to be 10 milliseconds.
3367 // (Where is this written down?)
3368 // If someone wants to sleep for only a fraction of the default,
3369 // then we set the timer resolution down to 1 millisecond for
3370 // the duration of their interval.
3371 // We carefully set the resolution back, since otherwise we
3372 // seem to incur an overhead (3%?) that we don't need.
3373 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3374 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3375 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3376 // timeBeginPeriod() if the relative error exceeded some threshold.
3377 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3378 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3379 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3380 // resolution timers running.
3381 private:
3382 jlong resolution;
3383 public:
3384 HighResolutionInterval(jlong ms) {
3385 resolution = ms % 10L;
3386 if (resolution != 0) {
3387 MMRESULT result = timeBeginPeriod(1L);
3388 }
3389 }
3390 ~HighResolutionInterval() {
3391 if (resolution != 0) {
3392 MMRESULT result = timeEndPeriod(1L);
3393 }
3394 resolution = 0L;
3395 }
3396 };
3397
3398 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3399 jlong limit = (jlong) MAXDWORD;
3400
3401 while (ms > limit) {
3402 int res;
3403 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3404 return res;
3405 }
3406 ms -= limit;
3407 }
3408
3409 assert(thread == Thread::current(), "thread consistency check");
3410 OSThread* osthread = thread->osthread();
3411 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3412 int result;
3413 if (interruptable) {
3414 assert(thread->is_Java_thread(), "must be java thread");
3415 JavaThread *jt = (JavaThread *) thread;
3416 ThreadBlockInVM tbivm(jt);
3417
3418 jt->set_suspend_equivalent();
3419 // cleared by handle_special_suspend_equivalent_condition() or
3420 // java_suspend_self() via check_and_wait_while_suspended()
3421
3422 HANDLE events[1];
3423 events[0] = osthread->interrupt_event();
3424 HighResolutionInterval *phri=NULL;
3425 if (!ForceTimeHighResolution) {
3426 phri = new HighResolutionInterval(ms);
3427 }
3428 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3429 result = OS_TIMEOUT;
3430 } else {
3431 ResetEvent(osthread->interrupt_event());
3432 osthread->set_interrupted(false);
3433 result = OS_INTRPT;
3434 }
3435 delete phri; //if it is NULL, harmless
3436
3437 // were we externally suspended while we were waiting?
3438 jt->check_and_wait_while_suspended();
3439 } else {
3440 assert(!thread->is_Java_thread(), "must not be java thread");
3441 Sleep((long) ms);
3442 result = OS_TIMEOUT;
3443 }
3444 return result;
3445 }
3446
3447 // Short sleep, direct OS call.
3448 //
3449 // ms = 0, means allow others (if any) to run.
3450 //
3451 void os::naked_short_sleep(jlong ms) {
3452 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3453 Sleep(ms);
3454 }
3455
3456 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3457 void os::infinite_sleep() {
3458 while (true) { // sleep forever ...
3459 Sleep(100000); // ... 100 seconds at a time
3460 }
3461 }
3462
3463 typedef BOOL (WINAPI * STTSignature)(void);
3464
3465 void os::naked_yield() {
3466 // Consider passing back the return value from SwitchToThread().
3467 SwitchToThread();
3468 }
3469
3470 // Win32 only gives you access to seven real priorities at a time,
3471 // so we compress Java's ten down to seven. It would be better
3472 // if we dynamically adjusted relative priorities.
3473
3474 int os::java_to_os_priority[CriticalPriority + 1] = {
3475 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3476 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3477 THREAD_PRIORITY_LOWEST, // 2
3478 THREAD_PRIORITY_BELOW_NORMAL, // 3
3479 THREAD_PRIORITY_BELOW_NORMAL, // 4
3480 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3481 THREAD_PRIORITY_NORMAL, // 6
3482 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3483 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3484 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3485 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3486 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3487 };
3488
3489 int prio_policy1[CriticalPriority + 1] = {
3490 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3491 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3492 THREAD_PRIORITY_LOWEST, // 2
3493 THREAD_PRIORITY_BELOW_NORMAL, // 3
3494 THREAD_PRIORITY_BELOW_NORMAL, // 4
3495 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3496 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3497 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3498 THREAD_PRIORITY_HIGHEST, // 8
3499 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3500 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3501 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3502 };
3503
3504 static int prio_init() {
3505 // If ThreadPriorityPolicy is 1, switch tables
3506 if (ThreadPriorityPolicy == 1) {
3507 int i;
3508 for (i = 0; i < CriticalPriority + 1; i++) {
3509 os::java_to_os_priority[i] = prio_policy1[i];
3510 }
3511 }
3512 if (UseCriticalJavaThreadPriority) {
3513 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3514 }
3515 return 0;
3516 }
3517
3518 OSReturn os::set_native_priority(Thread* thread, int priority) {
3519 if (!UseThreadPriorities) return OS_OK;
3520 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3521 return ret ? OS_OK : OS_ERR;
3522 }
3523
3524 OSReturn os::get_native_priority(const Thread* const thread,
3525 int* priority_ptr) {
3526 if (!UseThreadPriorities) {
3527 *priority_ptr = java_to_os_priority[NormPriority];
3528 return OS_OK;
3529 }
3530 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3531 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3532 assert(false, "GetThreadPriority failed");
3533 return OS_ERR;
3534 }
3535 *priority_ptr = os_prio;
3536 return OS_OK;
3537 }
3538
3539
3540 // Hint to the underlying OS that a task switch would not be good.
3541 // Void return because it's a hint and can fail.
3542 void os::hint_no_preempt() {}
3543
3544 void os::interrupt(Thread* thread) {
3545 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3546 Threads_lock->owned_by_self(),
3547 "possibility of dangling Thread pointer");
3548
3549 OSThread* osthread = thread->osthread();
3550 osthread->set_interrupted(true);
3551 // More than one thread can get here with the same value of osthread,
3552 // resulting in multiple notifications. We do, however, want the store
3553 // to interrupted() to be visible to other threads before we post
3554 // the interrupt event.
3555 OrderAccess::release();
3556 SetEvent(osthread->interrupt_event());
3557 // For JSR166: unpark after setting status
3558 if (thread->is_Java_thread()) {
3559 ((JavaThread*)thread)->parker()->unpark();
3560 }
3561
3562 ParkEvent * ev = thread->_ParkEvent;
3563 if (ev != NULL) ev->unpark();
3564 }
3565
3566
3567 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3568 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3569 "possibility of dangling Thread pointer");
3570
3571 OSThread* osthread = thread->osthread();
3572 // There is no synchronization between the setting of the interrupt
3573 // and it being cleared here. It is critical - see 6535709 - that
3574 // we only clear the interrupt state, and reset the interrupt event,
3575 // if we are going to report that we were indeed interrupted - else
3576 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3577 // depending on the timing. By checking thread interrupt event to see
3578 // if the thread gets real interrupt thus prevent spurious wakeup.
3579 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3580 if (interrupted && clear_interrupted) {
3581 osthread->set_interrupted(false);
3582 ResetEvent(osthread->interrupt_event());
3583 } // Otherwise leave the interrupted state alone
3584
3585 return interrupted;
3586 }
3587
3588 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3589 ExtendedPC os::get_thread_pc(Thread* thread) {
3590 CONTEXT context;
3591 context.ContextFlags = CONTEXT_CONTROL;
3592 HANDLE handle = thread->osthread()->thread_handle();
3593 if (GetThreadContext(handle, &context)) {
3594 #ifdef _M_AMD64
3595 return ExtendedPC((address) context.Rip);
3596 #else
3597 return ExtendedPC((address) context.Eip);
3598 #endif
3599 } else {
3600 return ExtendedPC(NULL);
3601 }
3602 }
3603
3604 // GetCurrentThreadId() returns DWORD
3605 intx os::current_thread_id() { return GetCurrentThreadId(); }
3606
3607 static int _initial_pid = 0;
3608
3609 int os::current_process_id() {
3610 return (_initial_pid ? _initial_pid : _getpid());
3611 }
3612
3613 int os::win32::_vm_page_size = 0;
3614 int os::win32::_vm_allocation_granularity = 0;
3615 int os::win32::_processor_type = 0;
3616 // Processor level is not available on non-NT systems, use vm_version instead
3617 int os::win32::_processor_level = 0;
3618 julong os::win32::_physical_memory = 0;
3619 size_t os::win32::_default_stack_size = 0;
3620
3621 intx os::win32::_os_thread_limit = 0;
3622 volatile intx os::win32::_os_thread_count = 0;
3623
3624 bool os::win32::_is_windows_server = false;
3625
3626 // 6573254
3627 // Currently, the bug is observed across all the supported Windows releases,
3628 // including the latest one (as of this writing - Windows Server 2012 R2)
3629 bool os::win32::_has_exit_bug = true;
3630
3631 void os::win32::initialize_system_info() {
3632 SYSTEM_INFO si;
3633 GetSystemInfo(&si);
3634 _vm_page_size = si.dwPageSize;
3635 _vm_allocation_granularity = si.dwAllocationGranularity;
3636 _processor_type = si.dwProcessorType;
3637 _processor_level = si.wProcessorLevel;
3638 set_processor_count(si.dwNumberOfProcessors);
3639
3640 MEMORYSTATUSEX ms;
3641 ms.dwLength = sizeof(ms);
3642
3643 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3644 // dwMemoryLoad (% of memory in use)
3645 GlobalMemoryStatusEx(&ms);
3646 _physical_memory = ms.ullTotalPhys;
3647
3648 if (FLAG_IS_DEFAULT(MaxRAM)) {
3649 // Adjust MaxRAM according to the maximum virtual address space available.
3650 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3651 }
3652
3653 OSVERSIONINFOEX oi;
3654 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3655 GetVersionEx((OSVERSIONINFO*)&oi);
3656 switch (oi.dwPlatformId) {
3657 case VER_PLATFORM_WIN32_NT:
3658 {
3659 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3660 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3661 oi.wProductType == VER_NT_SERVER) {
3662 _is_windows_server = true;
3663 }
3664 }
3665 break;
3666 default: fatal("Unknown platform");
3667 }
3668
3669 _default_stack_size = os::current_stack_size();
3670 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3671 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3672 "stack size not a multiple of page size");
3673
3674 initialize_performance_counter();
3675 }
3676
3677
3678 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3679 int ebuflen) {
3680 char path[MAX_PATH];
3681 DWORD size;
3682 DWORD pathLen = (DWORD)sizeof(path);
3683 HINSTANCE result = NULL;
3684
3685 // only allow library name without path component
3686 assert(strchr(name, '\\') == NULL, "path not allowed");
3687 assert(strchr(name, ':') == NULL, "path not allowed");
3688 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3689 jio_snprintf(ebuf, ebuflen,
3690 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3691 return NULL;
3692 }
3693
3694 // search system directory
3695 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3696 if (size >= pathLen) {
3697 return NULL; // truncated
3698 }
3699 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3700 return NULL; // truncated
3701 }
3702 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3703 return result;
3704 }
3705 }
3706
3707 // try Windows directory
3708 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3709 if (size >= pathLen) {
3710 return NULL; // truncated
3711 }
3712 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3713 return NULL; // truncated
3714 }
3715 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3716 return result;
3717 }
3718 }
3719
3720 jio_snprintf(ebuf, ebuflen,
3721 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3722 return NULL;
3723 }
3724
3725 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3726 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3727
3728 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3729 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3730 return TRUE;
3731 }
3732
3733 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3734 // Basic approach:
3735 // - Each exiting thread registers its intent to exit and then does so.
3736 // - A thread trying to terminate the process must wait for all
3737 // threads currently exiting to complete their exit.
3738
3739 if (os::win32::has_exit_bug()) {
3740 // The array holds handles of the threads that have started exiting by calling
3741 // _endthreadex().
3742 // Should be large enough to avoid blocking the exiting thread due to lack of
3743 // a free slot.
3744 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3745 static int handle_count = 0;
3746
3747 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3748 static CRITICAL_SECTION crit_sect;
3749 static volatile jint process_exiting = 0;
3750 int i, j;
3751 DWORD res;
3752 HANDLE hproc, hthr;
3753
3754 // We only attempt to register threads until a process exiting
3755 // thread manages to set the process_exiting flag. Any threads
3756 // that come through here after the process_exiting flag is set
3757 // are unregistered and will be caught in the SuspendThread()
3758 // infinite loop below.
3759 bool registered = false;
3760
3761 // The first thread that reached this point, initializes the critical section.
3762 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3763 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3764 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3765 if (what != EPT_THREAD) {
3766 // Atomically set process_exiting before the critical section
3767 // to increase the visibility between racing threads.
3768 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3769 }
3770 EnterCriticalSection(&crit_sect);
3771
3772 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3773 // Remove from the array those handles of the threads that have completed exiting.
3774 for (i = 0, j = 0; i < handle_count; ++i) {
3775 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3776 if (res == WAIT_TIMEOUT) {
3777 handles[j++] = handles[i];
3778 } else {
3779 if (res == WAIT_FAILED) {
3780 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3781 GetLastError(), __FILE__, __LINE__);
3782 }
3783 // Don't keep the handle, if we failed waiting for it.
3784 CloseHandle(handles[i]);
3785 }
3786 }
3787
3788 // If there's no free slot in the array of the kept handles, we'll have to
3789 // wait until at least one thread completes exiting.
3790 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3791 // Raise the priority of the oldest exiting thread to increase its chances
3792 // to complete sooner.
3793 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3794 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3795 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3796 i = (res - WAIT_OBJECT_0);
3797 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3798 for (; i < handle_count; ++i) {
3799 handles[i] = handles[i + 1];
3800 }
3801 } else {
3802 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3803 (res == WAIT_FAILED ? "failed" : "timed out"),
3804 GetLastError(), __FILE__, __LINE__);
3805 // Don't keep handles, if we failed waiting for them.
3806 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3807 CloseHandle(handles[i]);
3808 }
3809 handle_count = 0;
3810 }
3811 }
3812
3813 // Store a duplicate of the current thread handle in the array of handles.
3814 hproc = GetCurrentProcess();
3815 hthr = GetCurrentThread();
3816 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3817 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3818 warning("DuplicateHandle failed (%u) in %s: %d\n",
3819 GetLastError(), __FILE__, __LINE__);
3820
3821 // We can't register this thread (no more handles) so this thread
3822 // may be racing with a thread that is calling exit(). If the thread
3823 // that is calling exit() has managed to set the process_exiting
3824 // flag, then this thread will be caught in the SuspendThread()
3825 // infinite loop below which closes that race. A small timing
3826 // window remains before the process_exiting flag is set, but it
3827 // is only exposed when we are out of handles.
3828 } else {
3829 ++handle_count;
3830 registered = true;
3831
3832 // The current exiting thread has stored its handle in the array, and now
3833 // should leave the critical section before calling _endthreadex().
3834 }
3835
3836 } else if (what != EPT_THREAD && handle_count > 0) {
3837 jlong start_time, finish_time, timeout_left;
3838 // Before ending the process, make sure all the threads that had called
3839 // _endthreadex() completed.
3840
3841 // Set the priority level of the current thread to the same value as
3842 // the priority level of exiting threads.
3843 // This is to ensure it will be given a fair chance to execute if
3844 // the timeout expires.
3845 hthr = GetCurrentThread();
3846 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3847 start_time = os::javaTimeNanos();
3848 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3849 for (i = 0; ; ) {
3850 int portion_count = handle_count - i;
3851 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3852 portion_count = MAXIMUM_WAIT_OBJECTS;
3853 }
3854 for (j = 0; j < portion_count; ++j) {
3855 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3856 }
3857 timeout_left = (finish_time - start_time) / 1000000L;
3858 if (timeout_left < 0) {
3859 timeout_left = 0;
3860 }
3861 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3862 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3863 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3864 (res == WAIT_FAILED ? "failed" : "timed out"),
3865 GetLastError(), __FILE__, __LINE__);
3866 // Reset portion_count so we close the remaining
3867 // handles due to this error.
3868 portion_count = handle_count - i;
3869 }
3870 for (j = 0; j < portion_count; ++j) {
3871 CloseHandle(handles[i + j]);
3872 }
3873 if ((i += portion_count) >= handle_count) {
3874 break;
3875 }
3876 start_time = os::javaTimeNanos();
3877 }
3878 handle_count = 0;
3879 }
3880
3881 LeaveCriticalSection(&crit_sect);
3882 }
3883
3884 if (!registered &&
3885 OrderAccess::load_acquire(&process_exiting) != 0 &&
3886 process_exiting != (jint)GetCurrentThreadId()) {
3887 // Some other thread is about to call exit(), so we don't let
3888 // the current unregistered thread proceed to exit() or _endthreadex()
3889 while (true) {
3890 SuspendThread(GetCurrentThread());
3891 // Avoid busy-wait loop, if SuspendThread() failed.
3892 Sleep(EXIT_TIMEOUT);
3893 }
3894 }
3895 }
3896
3897 // We are here if either
3898 // - there's no 'race at exit' bug on this OS release;
3899 // - initialization of the critical section failed (unlikely);
3900 // - the current thread has registered itself and left the critical section;
3901 // - the process-exiting thread has raised the flag and left the critical section.
3902 if (what == EPT_THREAD) {
3903 _endthreadex((unsigned)exit_code);
3904 } else if (what == EPT_PROCESS) {
3905 ::exit(exit_code);
3906 } else {
3907 _exit(exit_code);
3908 }
3909
3910 // Should not reach here
3911 return exit_code;
3912 }
3913
3914 #undef EXIT_TIMEOUT
3915
3916 void os::win32::setmode_streams() {
3917 _setmode(_fileno(stdin), _O_BINARY);
3918 _setmode(_fileno(stdout), _O_BINARY);
3919 _setmode(_fileno(stderr), _O_BINARY);
3920 }
3921
3922
3923 bool os::is_debugger_attached() {
3924 return IsDebuggerPresent() ? true : false;
3925 }
3926
3927
3928 void os::wait_for_keypress_at_exit(void) {
3929 if (PauseAtExit) {
3930 fprintf(stderr, "Press any key to continue...\n");
3931 fgetc(stdin);
3932 }
3933 }
3934
3935
3936 bool os::message_box(const char* title, const char* message) {
3937 int result = MessageBox(NULL, message, title,
3938 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3939 return result == IDYES;
3940 }
3941
3942 #ifndef PRODUCT
3943 #ifndef _WIN64
3944 // Helpers to check whether NX protection is enabled
3945 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3946 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3947 pex->ExceptionRecord->NumberParameters > 0 &&
3948 pex->ExceptionRecord->ExceptionInformation[0] ==
3949 EXCEPTION_INFO_EXEC_VIOLATION) {
3950 return EXCEPTION_EXECUTE_HANDLER;
3951 }
3952 return EXCEPTION_CONTINUE_SEARCH;
3953 }
3954
3955 void nx_check_protection() {
3956 // If NX is enabled we'll get an exception calling into code on the stack
3957 char code[] = { (char)0xC3 }; // ret
3958 void *code_ptr = (void *)code;
3959 __try {
3960 __asm call code_ptr
3961 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3962 tty->print_raw_cr("NX protection detected.");
3963 }
3964 }
3965 #endif // _WIN64
3966 #endif // PRODUCT
3967
3968 // This is called _before_ the global arguments have been parsed
3969 void os::init(void) {
3970 _initial_pid = _getpid();
3971
3972 init_random(1234567);
3973
3974 win32::initialize_system_info();
3975 win32::setmode_streams();
3976 init_page_sizes((size_t) win32::vm_page_size());
3977
3978 // This may be overridden later when argument processing is done.
3979 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
3980
3981 // Initialize main_process and main_thread
3982 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3983 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3984 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3985 fatal("DuplicateHandle failed\n");
3986 }
3987 main_thread_id = (int) GetCurrentThreadId();
3988
3989 // initialize fast thread access - only used for 32-bit
3990 win32::initialize_thread_ptr_offset();
3991 }
3992
3993 // To install functions for atexit processing
3994 extern "C" {
3995 static void perfMemory_exit_helper() {
3996 perfMemory_exit();
3997 }
3998 }
3999
4000 static jint initSock();
4001
4002 // this is called _after_ the global arguments have been parsed
4003 jint os::init_2(void) {
4004 // Allocate a single page and mark it as readable for safepoint polling
4005 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4006 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4007
4008 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4009 guarantee(return_page != NULL, "Commit Failed for polling page");
4010
4011 os::set_polling_page(polling_page);
4012 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4013
4014 if (!UseMembar) {
4015 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4016 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4017
4018 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4019 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4020
4021 os::set_memory_serialize_page(mem_serialize_page);
4022 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4023 }
4024
4025 // Setup Windows Exceptions
4026
4027 // for debugging float code generation bugs
4028 if (ForceFloatExceptions) {
4029 #ifndef _WIN64
4030 static long fp_control_word = 0;
4031 __asm { fstcw fp_control_word }
4032 // see Intel PPro Manual, Vol. 2, p 7-16
4033 const long precision = 0x20;
4034 const long underflow = 0x10;
4035 const long overflow = 0x08;
4036 const long zero_div = 0x04;
4037 const long denorm = 0x02;
4038 const long invalid = 0x01;
4039 fp_control_word |= invalid;
4040 __asm { fldcw fp_control_word }
4041 #endif
4042 }
4043
4044 // If stack_commit_size is 0, windows will reserve the default size,
4045 // but only commit a small portion of it.
4046 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4047 size_t default_reserve_size = os::win32::default_stack_size();
4048 size_t actual_reserve_size = stack_commit_size;
4049 if (stack_commit_size < default_reserve_size) {
4050 // If stack_commit_size == 0, we want this too
4051 actual_reserve_size = default_reserve_size;
4052 }
4053
4054 // Check minimum allowable stack size for thread creation and to initialize
4055 // the java system classes, including StackOverflowError - depends on page
4056 // size. Add two 4K pages for compiler2 recursion in main thread.
4057 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4058 // class initialization depending on 32 or 64 bit VM.
4059 size_t min_stack_allowed =
4060 (size_t)(JavaThread::stack_guard_zone_size() +
4061 JavaThread::stack_shadow_zone_size() +
4062 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4063
4064 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size());
4065
4066 if (actual_reserve_size < min_stack_allowed) {
4067 tty->print_cr("\nThe Java thread stack size specified is too small. "
4068 "Specify at least %dk",
4069 min_stack_allowed / K);
4070 return JNI_ERR;
4071 }
4072
4073 JavaThread::set_stack_size_at_create(stack_commit_size);
4074
4075 // Calculate theoretical max. size of Threads to guard gainst artifical
4076 // out-of-memory situations, where all available address-space has been
4077 // reserved by thread stacks.
4078 assert(actual_reserve_size != 0, "Must have a stack");
4079
4080 // Calculate the thread limit when we should start doing Virtual Memory
4081 // banging. Currently when the threads will have used all but 200Mb of space.
4082 //
4083 // TODO: consider performing a similar calculation for commit size instead
4084 // as reserve size, since on a 64-bit platform we'll run into that more
4085 // often than running out of virtual memory space. We can use the
4086 // lower value of the two calculations as the os_thread_limit.
4087 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4088 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4089
4090 // at exit methods are called in the reverse order of their registration.
4091 // there is no limit to the number of functions registered. atexit does
4092 // not set errno.
4093
4094 if (PerfAllowAtExitRegistration) {
4095 // only register atexit functions if PerfAllowAtExitRegistration is set.
4096 // atexit functions can be delayed until process exit time, which
4097 // can be problematic for embedded VM situations. Embedded VMs should
4098 // call DestroyJavaVM() to assure that VM resources are released.
4099
4100 // note: perfMemory_exit_helper atexit function may be removed in
4101 // the future if the appropriate cleanup code can be added to the
4102 // VM_Exit VMOperation's doit method.
4103 if (atexit(perfMemory_exit_helper) != 0) {
4104 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4105 }
4106 }
4107
4108 #ifndef _WIN64
4109 // Print something if NX is enabled (win32 on AMD64)
4110 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4111 #endif
4112
4113 // initialize thread priority policy
4114 prio_init();
4115
4116 if (UseNUMA && !ForceNUMA) {
4117 UseNUMA = false; // We don't fully support this yet
4118 }
4119
4120 if (UseNUMAInterleaving) {
4121 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4122 bool success = numa_interleaving_init();
4123 if (!success) UseNUMAInterleaving = false;
4124 }
4125
4126 if (initSock() != JNI_OK) {
4127 return JNI_ERR;
4128 }
4129
4130 return JNI_OK;
4131 }
4132
4133 // Mark the polling page as unreadable
4134 void os::make_polling_page_unreadable(void) {
4135 DWORD old_status;
4136 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4137 PAGE_NOACCESS, &old_status)) {
4138 fatal("Could not disable polling page");
4139 }
4140 }
4141
4142 // Mark the polling page as readable
4143 void os::make_polling_page_readable(void) {
4144 DWORD old_status;
4145 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4146 PAGE_READONLY, &old_status)) {
4147 fatal("Could not enable polling page");
4148 }
4149 }
4150
4151
4152 int os::stat(const char *path, struct stat *sbuf) {
4153 char pathbuf[MAX_PATH];
4154 if (strlen(path) > MAX_PATH - 1) {
4155 errno = ENAMETOOLONG;
4156 return -1;
4157 }
4158 os::native_path(strcpy(pathbuf, path));
4159 int ret = ::stat(pathbuf, sbuf);
4160 if (sbuf != NULL && UseUTCFileTimestamp) {
4161 // Fix for 6539723. st_mtime returned from stat() is dependent on
4162 // the system timezone and so can return different values for the
4163 // same file if/when daylight savings time changes. This adjustment
4164 // makes sure the same timestamp is returned regardless of the TZ.
4165 //
4166 // See:
4167 // http://msdn.microsoft.com/library/
4168 // default.asp?url=/library/en-us/sysinfo/base/
4169 // time_zone_information_str.asp
4170 // and
4171 // http://msdn.microsoft.com/library/default.asp?url=
4172 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4173 //
4174 // NOTE: there is a insidious bug here: If the timezone is changed
4175 // after the call to stat() but before 'GetTimeZoneInformation()', then
4176 // the adjustment we do here will be wrong and we'll return the wrong
4177 // value (which will likely end up creating an invalid class data
4178 // archive). Absent a better API for this, or some time zone locking
4179 // mechanism, we'll have to live with this risk.
4180 TIME_ZONE_INFORMATION tz;
4181 DWORD tzid = GetTimeZoneInformation(&tz);
4182 int daylightBias =
4183 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4184 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4185 }
4186 return ret;
4187 }
4188
4189
4190 #define FT2INT64(ft) \
4191 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4192
4193
4194 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4195 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4196 // of a thread.
4197 //
4198 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4199 // the fast estimate available on the platform.
4200
4201 // current_thread_cpu_time() is not optimized for Windows yet
4202 jlong os::current_thread_cpu_time() {
4203 // return user + sys since the cost is the same
4204 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4205 }
4206
4207 jlong os::thread_cpu_time(Thread* thread) {
4208 // consistent with what current_thread_cpu_time() returns.
4209 return os::thread_cpu_time(thread, true /* user+sys */);
4210 }
4211
4212 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4213 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4214 }
4215
4216 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4217 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4218 // If this function changes, os::is_thread_cpu_time_supported() should too
4219 FILETIME CreationTime;
4220 FILETIME ExitTime;
4221 FILETIME KernelTime;
4222 FILETIME UserTime;
4223
4224 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4225 &ExitTime, &KernelTime, &UserTime) == 0) {
4226 return -1;
4227 } else if (user_sys_cpu_time) {
4228 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4229 } else {
4230 return FT2INT64(UserTime) * 100;
4231 }
4232 }
4233
4234 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4235 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4236 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4237 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4238 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4239 }
4240
4241 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4242 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4243 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4244 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4245 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4246 }
4247
4248 bool os::is_thread_cpu_time_supported() {
4249 // see os::thread_cpu_time
4250 FILETIME CreationTime;
4251 FILETIME ExitTime;
4252 FILETIME KernelTime;
4253 FILETIME UserTime;
4254
4255 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4256 &KernelTime, &UserTime) == 0) {
4257 return false;
4258 } else {
4259 return true;
4260 }
4261 }
4262
4263 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4264 // It does have primitives (PDH API) to get CPU usage and run queue length.
4265 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4266 // If we wanted to implement loadavg on Windows, we have a few options:
4267 //
4268 // a) Query CPU usage and run queue length and "fake" an answer by
4269 // returning the CPU usage if it's under 100%, and the run queue
4270 // length otherwise. It turns out that querying is pretty slow
4271 // on Windows, on the order of 200 microseconds on a fast machine.
4272 // Note that on the Windows the CPU usage value is the % usage
4273 // since the last time the API was called (and the first call
4274 // returns 100%), so we'd have to deal with that as well.
4275 //
4276 // b) Sample the "fake" answer using a sampling thread and store
4277 // the answer in a global variable. The call to loadavg would
4278 // just return the value of the global, avoiding the slow query.
4279 //
4280 // c) Sample a better answer using exponential decay to smooth the
4281 // value. This is basically the algorithm used by UNIX kernels.
4282 //
4283 // Note that sampling thread starvation could affect both (b) and (c).
4284 int os::loadavg(double loadavg[], int nelem) {
4285 return -1;
4286 }
4287
4288
4289 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4290 bool os::dont_yield() {
4291 return DontYieldALot;
4292 }
4293
4294 // This method is a slightly reworked copy of JDK's sysOpen
4295 // from src/windows/hpi/src/sys_api_md.c
4296
4297 int os::open(const char *path, int oflag, int mode) {
4298 char pathbuf[MAX_PATH];
4299
4300 if (strlen(path) > MAX_PATH - 1) {
4301 errno = ENAMETOOLONG;
4302 return -1;
4303 }
4304 os::native_path(strcpy(pathbuf, path));
4305 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4306 }
4307
4308 FILE* os::open(int fd, const char* mode) {
4309 return ::_fdopen(fd, mode);
4310 }
4311
4312 // Is a (classpath) directory empty?
4313 bool os::dir_is_empty(const char* path) {
4314 WIN32_FIND_DATA fd;
4315 HANDLE f = FindFirstFile(path, &fd);
4316 if (f == INVALID_HANDLE_VALUE) {
4317 return true;
4318 }
4319 FindClose(f);
4320 return false;
4321 }
4322
4323 // create binary file, rewriting existing file if required
4324 int os::create_binary_file(const char* path, bool rewrite_existing) {
4325 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4326 if (!rewrite_existing) {
4327 oflags |= _O_EXCL;
4328 }
4329 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4330 }
4331
4332 // return current position of file pointer
4333 jlong os::current_file_offset(int fd) {
4334 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4335 }
4336
4337 // move file pointer to the specified offset
4338 jlong os::seek_to_file_offset(int fd, jlong offset) {
4339 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4340 }
4341
4342
4343 jlong os::lseek(int fd, jlong offset, int whence) {
4344 return (jlong) ::_lseeki64(fd, offset, whence);
4345 }
4346
4347 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4348 OVERLAPPED ov;
4349 DWORD nread;
4350 BOOL result;
4351
4352 ZeroMemory(&ov, sizeof(ov));
4353 ov.Offset = (DWORD)offset;
4354 ov.OffsetHigh = (DWORD)(offset >> 32);
4355
4356 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4357
4358 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4359
4360 return result ? nread : 0;
4361 }
4362
4363
4364 // This method is a slightly reworked copy of JDK's sysNativePath
4365 // from src/windows/hpi/src/path_md.c
4366
4367 // Convert a pathname to native format. On win32, this involves forcing all
4368 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4369 // sometimes rejects '/') and removing redundant separators. The input path is
4370 // assumed to have been converted into the character encoding used by the local
4371 // system. Because this might be a double-byte encoding, care is taken to
4372 // treat double-byte lead characters correctly.
4373 //
4374 // This procedure modifies the given path in place, as the result is never
4375 // longer than the original. There is no error return; this operation always
4376 // succeeds.
4377 char * os::native_path(char *path) {
4378 char *src = path, *dst = path, *end = path;
4379 char *colon = NULL; // If a drive specifier is found, this will
4380 // point to the colon following the drive letter
4381
4382 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4383 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4384 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4385
4386 // Check for leading separators
4387 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4388 while (isfilesep(*src)) {
4389 src++;
4390 }
4391
4392 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4393 // Remove leading separators if followed by drive specifier. This
4394 // hack is necessary to support file URLs containing drive
4395 // specifiers (e.g., "file://c:/path"). As a side effect,
4396 // "/c:/path" can be used as an alternative to "c:/path".
4397 *dst++ = *src++;
4398 colon = dst;
4399 *dst++ = ':';
4400 src++;
4401 } else {
4402 src = path;
4403 if (isfilesep(src[0]) && isfilesep(src[1])) {
4404 // UNC pathname: Retain first separator; leave src pointed at
4405 // second separator so that further separators will be collapsed
4406 // into the second separator. The result will be a pathname
4407 // beginning with "\\\\" followed (most likely) by a host name.
4408 src = dst = path + 1;
4409 path[0] = '\\'; // Force first separator to '\\'
4410 }
4411 }
4412
4413 end = dst;
4414
4415 // Remove redundant separators from remainder of path, forcing all
4416 // separators to be '\\' rather than '/'. Also, single byte space
4417 // characters are removed from the end of the path because those
4418 // are not legal ending characters on this operating system.
4419 //
4420 while (*src != '\0') {
4421 if (isfilesep(*src)) {
4422 *dst++ = '\\'; src++;
4423 while (isfilesep(*src)) src++;
4424 if (*src == '\0') {
4425 // Check for trailing separator
4426 end = dst;
4427 if (colon == dst - 2) break; // "z:\\"
4428 if (dst == path + 1) break; // "\\"
4429 if (dst == path + 2 && isfilesep(path[0])) {
4430 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4431 // beginning of a UNC pathname. Even though it is not, by
4432 // itself, a valid UNC pathname, we leave it as is in order
4433 // to be consistent with the path canonicalizer as well
4434 // as the win32 APIs, which treat this case as an invalid
4435 // UNC pathname rather than as an alias for the root
4436 // directory of the current drive.
4437 break;
4438 }
4439 end = --dst; // Path does not denote a root directory, so
4440 // remove trailing separator
4441 break;
4442 }
4443 end = dst;
4444 } else {
4445 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4446 *dst++ = *src++;
4447 if (*src) *dst++ = *src++;
4448 end = dst;
4449 } else { // Copy a single-byte character
4450 char c = *src++;
4451 *dst++ = c;
4452 // Space is not a legal ending character
4453 if (c != ' ') end = dst;
4454 }
4455 }
4456 }
4457
4458 *end = '\0';
4459
4460 // For "z:", add "." to work around a bug in the C runtime library
4461 if (colon == dst - 1) {
4462 path[2] = '.';
4463 path[3] = '\0';
4464 }
4465
4466 return path;
4467 }
4468
4469 // This code is a copy of JDK's sysSetLength
4470 // from src/windows/hpi/src/sys_api_md.c
4471
4472 int os::ftruncate(int fd, jlong length) {
4473 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4474 long high = (long)(length >> 32);
4475 DWORD ret;
4476
4477 if (h == (HANDLE)(-1)) {
4478 return -1;
4479 }
4480
4481 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4482 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4483 return -1;
4484 }
4485
4486 if (::SetEndOfFile(h) == FALSE) {
4487 return -1;
4488 }
4489
4490 return 0;
4491 }
4492
4493 int os::get_fileno(FILE* fp) {
4494 return _fileno(fp);
4495 }
4496
4497 // This code is a copy of JDK's sysSync
4498 // from src/windows/hpi/src/sys_api_md.c
4499 // except for the legacy workaround for a bug in Win 98
4500
4501 int os::fsync(int fd) {
4502 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4503
4504 if ((!::FlushFileBuffers(handle)) &&
4505 (GetLastError() != ERROR_ACCESS_DENIED)) {
4506 // from winerror.h
4507 return -1;
4508 }
4509 return 0;
4510 }
4511
4512 static int nonSeekAvailable(int, long *);
4513 static int stdinAvailable(int, long *);
4514
4515 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4516 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4517
4518 // This code is a copy of JDK's sysAvailable
4519 // from src/windows/hpi/src/sys_api_md.c
4520
4521 int os::available(int fd, jlong *bytes) {
4522 jlong cur, end;
4523 struct _stati64 stbuf64;
4524
4525 if (::_fstati64(fd, &stbuf64) >= 0) {
4526 int mode = stbuf64.st_mode;
4527 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4528 int ret;
4529 long lpbytes;
4530 if (fd == 0) {
4531 ret = stdinAvailable(fd, &lpbytes);
4532 } else {
4533 ret = nonSeekAvailable(fd, &lpbytes);
4534 }
4535 (*bytes) = (jlong)(lpbytes);
4536 return ret;
4537 }
4538 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4539 return FALSE;
4540 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4541 return FALSE;
4542 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4543 return FALSE;
4544 }
4545 *bytes = end - cur;
4546 return TRUE;
4547 } else {
4548 return FALSE;
4549 }
4550 }
4551
4552 void os::flockfile(FILE* fp) {
4553 _lock_file(fp);
4554 }
4555
4556 void os::funlockfile(FILE* fp) {
4557 _unlock_file(fp);
4558 }
4559
4560 // This code is a copy of JDK's nonSeekAvailable
4561 // from src/windows/hpi/src/sys_api_md.c
4562
4563 static int nonSeekAvailable(int fd, long *pbytes) {
4564 // This is used for available on non-seekable devices
4565 // (like both named and anonymous pipes, such as pipes
4566 // connected to an exec'd process).
4567 // Standard Input is a special case.
4568 HANDLE han;
4569
4570 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4571 return FALSE;
4572 }
4573
4574 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4575 // PeekNamedPipe fails when at EOF. In that case we
4576 // simply make *pbytes = 0 which is consistent with the
4577 // behavior we get on Solaris when an fd is at EOF.
4578 // The only alternative is to raise an Exception,
4579 // which isn't really warranted.
4580 //
4581 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4582 return FALSE;
4583 }
4584 *pbytes = 0;
4585 }
4586 return TRUE;
4587 }
4588
4589 #define MAX_INPUT_EVENTS 2000
4590
4591 // This code is a copy of JDK's stdinAvailable
4592 // from src/windows/hpi/src/sys_api_md.c
4593
4594 static int stdinAvailable(int fd, long *pbytes) {
4595 HANDLE han;
4596 DWORD numEventsRead = 0; // Number of events read from buffer
4597 DWORD numEvents = 0; // Number of events in buffer
4598 DWORD i = 0; // Loop index
4599 DWORD curLength = 0; // Position marker
4600 DWORD actualLength = 0; // Number of bytes readable
4601 BOOL error = FALSE; // Error holder
4602 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4603
4604 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4605 return FALSE;
4606 }
4607
4608 // Construct an array of input records in the console buffer
4609 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4610 if (error == 0) {
4611 return nonSeekAvailable(fd, pbytes);
4612 }
4613
4614 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4615 if (numEvents > MAX_INPUT_EVENTS) {
4616 numEvents = MAX_INPUT_EVENTS;
4617 }
4618
4619 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4620 if (lpBuffer == NULL) {
4621 return FALSE;
4622 }
4623
4624 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4625 if (error == 0) {
4626 os::free(lpBuffer);
4627 return FALSE;
4628 }
4629
4630 // Examine input records for the number of bytes available
4631 for (i=0; i<numEvents; i++) {
4632 if (lpBuffer[i].EventType == KEY_EVENT) {
4633
4634 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4635 &(lpBuffer[i].Event);
4636 if (keyRecord->bKeyDown == TRUE) {
4637 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4638 curLength++;
4639 if (*keyPressed == '\r') {
4640 actualLength = curLength;
4641 }
4642 }
4643 }
4644 }
4645
4646 if (lpBuffer != NULL) {
4647 os::free(lpBuffer);
4648 }
4649
4650 *pbytes = (long) actualLength;
4651 return TRUE;
4652 }
4653
4654 // Map a block of memory.
4655 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4656 char *addr, size_t bytes, bool read_only,
4657 bool allow_exec) {
4658 HANDLE hFile;
4659 char* base;
4660
4661 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4662 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4663 if (hFile == NULL) {
4664 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4665 return NULL;
4666 }
4667
4668 if (allow_exec) {
4669 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4670 // unless it comes from a PE image (which the shared archive is not.)
4671 // Even VirtualProtect refuses to give execute access to mapped memory
4672 // that was not previously executable.
4673 //
4674 // Instead, stick the executable region in anonymous memory. Yuck.
4675 // Penalty is that ~4 pages will not be shareable - in the future
4676 // we might consider DLLizing the shared archive with a proper PE
4677 // header so that mapping executable + sharing is possible.
4678
4679 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4680 PAGE_READWRITE);
4681 if (base == NULL) {
4682 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4683 CloseHandle(hFile);
4684 return NULL;
4685 }
4686
4687 DWORD bytes_read;
4688 OVERLAPPED overlapped;
4689 overlapped.Offset = (DWORD)file_offset;
4690 overlapped.OffsetHigh = 0;
4691 overlapped.hEvent = NULL;
4692 // ReadFile guarantees that if the return value is true, the requested
4693 // number of bytes were read before returning.
4694 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4695 if (!res) {
4696 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4697 release_memory(base, bytes);
4698 CloseHandle(hFile);
4699 return NULL;
4700 }
4701 } else {
4702 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4703 NULL /* file_name */);
4704 if (hMap == NULL) {
4705 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4706 CloseHandle(hFile);
4707 return NULL;
4708 }
4709
4710 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4711 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4712 (DWORD)bytes, addr);
4713 if (base == NULL) {
4714 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4715 CloseHandle(hMap);
4716 CloseHandle(hFile);
4717 return NULL;
4718 }
4719
4720 if (CloseHandle(hMap) == 0) {
4721 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4722 CloseHandle(hFile);
4723 return base;
4724 }
4725 }
4726
4727 if (allow_exec) {
4728 DWORD old_protect;
4729 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4730 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4731
4732 if (!res) {
4733 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4734 // Don't consider this a hard error, on IA32 even if the
4735 // VirtualProtect fails, we should still be able to execute
4736 CloseHandle(hFile);
4737 return base;
4738 }
4739 }
4740
4741 if (CloseHandle(hFile) == 0) {
4742 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4743 return base;
4744 }
4745
4746 return base;
4747 }
4748
4749
4750 // Remap a block of memory.
4751 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4752 char *addr, size_t bytes, bool read_only,
4753 bool allow_exec) {
4754 // This OS does not allow existing memory maps to be remapped so we
4755 // have to unmap the memory before we remap it.
4756 if (!os::unmap_memory(addr, bytes)) {
4757 return NULL;
4758 }
4759
4760 // There is a very small theoretical window between the unmap_memory()
4761 // call above and the map_memory() call below where a thread in native
4762 // code may be able to access an address that is no longer mapped.
4763
4764 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4765 read_only, allow_exec);
4766 }
4767
4768
4769 // Unmap a block of memory.
4770 // Returns true=success, otherwise false.
4771
4772 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4773 MEMORY_BASIC_INFORMATION mem_info;
4774 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4775 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4776 return false;
4777 }
4778
4779 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4780 // Instead, executable region was allocated using VirtualAlloc(). See
4781 // pd_map_memory() above.
4782 //
4783 // The following flags should match the 'exec_access' flages used for
4784 // VirtualProtect() in pd_map_memory().
4785 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4786 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4787 return pd_release_memory(addr, bytes);
4788 }
4789
4790 BOOL result = UnmapViewOfFile(addr);
4791 if (result == 0) {
4792 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4793 return false;
4794 }
4795 return true;
4796 }
4797
4798 void os::pause() {
4799 char filename[MAX_PATH];
4800 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4801 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4802 } else {
4803 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4804 }
4805
4806 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4807 if (fd != -1) {
4808 struct stat buf;
4809 ::close(fd);
4810 while (::stat(filename, &buf) == 0) {
4811 Sleep(100);
4812 }
4813 } else {
4814 jio_fprintf(stderr,
4815 "Could not open pause file '%s', continuing immediately.\n", filename);
4816 }
4817 }
4818
4819 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4820 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4821 }
4822
4823 // See the caveats for this class in os_windows.hpp
4824 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4825 // into this method and returns false. If no OS EXCEPTION was raised, returns
4826 // true.
4827 // The callback is supposed to provide the method that should be protected.
4828 //
4829 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4830 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4831 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4832 "crash_protection already set?");
4833
4834 bool success = true;
4835 __try {
4836 WatcherThread::watcher_thread()->set_crash_protection(this);
4837 cb.call();
4838 } __except(EXCEPTION_EXECUTE_HANDLER) {
4839 // only for protection, nothing to do
4840 success = false;
4841 }
4842 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4843 return success;
4844 }
4845
4846 // An Event wraps a win32 "CreateEvent" kernel handle.
4847 //
4848 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4849 //
4850 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4851 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4852 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4853 // In addition, an unpark() operation might fetch the handle field, but the
4854 // event could recycle between the fetch and the SetEvent() operation.
4855 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4856 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4857 // on an stale but recycled handle would be harmless, but in practice this might
4858 // confuse other non-Sun code, so it's not a viable approach.
4859 //
4860 // 2: Once a win32 event handle is associated with an Event, it remains associated
4861 // with the Event. The event handle is never closed. This could be construed
4862 // as handle leakage, but only up to the maximum # of threads that have been extant
4863 // at any one time. This shouldn't be an issue, as windows platforms typically
4864 // permit a process to have hundreds of thousands of open handles.
4865 //
4866 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4867 // and release unused handles.
4868 //
4869 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4870 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4871 //
4872 // 5. Use an RCU-like mechanism (Read-Copy Update).
4873 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4874 //
4875 // We use (2).
4876 //
4877 // TODO-FIXME:
4878 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4879 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4880 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4881 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4882 // into a single win32 CreateEvent() handle.
4883 //
4884 // Assumption:
4885 // Only one parker can exist on an event, which is why we allocate
4886 // them per-thread. Multiple unparkers can coexist.
4887 //
4888 // _Event transitions in park()
4889 // -1 => -1 : illegal
4890 // 1 => 0 : pass - return immediately
4891 // 0 => -1 : block; then set _Event to 0 before returning
4892 //
4893 // _Event transitions in unpark()
4894 // 0 => 1 : just return
4895 // 1 => 1 : just return
4896 // -1 => either 0 or 1; must signal target thread
4897 // That is, we can safely transition _Event from -1 to either
4898 // 0 or 1.
4899 //
4900 // _Event serves as a restricted-range semaphore.
4901 // -1 : thread is blocked, i.e. there is a waiter
4902 // 0 : neutral: thread is running or ready,
4903 // could have been signaled after a wait started
4904 // 1 : signaled - thread is running or ready
4905 //
4906 // Another possible encoding of _Event would be with
4907 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4908 //
4909
4910 int os::PlatformEvent::park(jlong Millis) {
4911 // Transitions for _Event:
4912 // -1 => -1 : illegal
4913 // 1 => 0 : pass - return immediately
4914 // 0 => -1 : block; then set _Event to 0 before returning
4915
4916 guarantee(_ParkHandle != NULL , "Invariant");
4917 guarantee(Millis > 0 , "Invariant");
4918
4919 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4920 // the initial park() operation.
4921 // Consider: use atomic decrement instead of CAS-loop
4922
4923 int v;
4924 for (;;) {
4925 v = _Event;
4926 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4927 }
4928 guarantee((v == 0) || (v == 1), "invariant");
4929 if (v != 0) return OS_OK;
4930
4931 // Do this the hard way by blocking ...
4932 // TODO: consider a brief spin here, gated on the success of recent
4933 // spin attempts by this thread.
4934 //
4935 // We decompose long timeouts into series of shorter timed waits.
4936 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4937 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4938 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4939 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4940 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4941 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4942 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4943 // for the already waited time. This policy does not admit any new outcomes.
4944 // In the future, however, we might want to track the accumulated wait time and
4945 // adjust Millis accordingly if we encounter a spurious wakeup.
4946
4947 const int MAXTIMEOUT = 0x10000000;
4948 DWORD rv = WAIT_TIMEOUT;
4949 while (_Event < 0 && Millis > 0) {
4950 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
4951 if (Millis > MAXTIMEOUT) {
4952 prd = MAXTIMEOUT;
4953 }
4954 rv = ::WaitForSingleObject(_ParkHandle, prd);
4955 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
4956 if (rv == WAIT_TIMEOUT) {
4957 Millis -= prd;
4958 }
4959 }
4960 v = _Event;
4961 _Event = 0;
4962 // see comment at end of os::PlatformEvent::park() below:
4963 OrderAccess::fence();
4964 // If we encounter a nearly simultanous timeout expiry and unpark()
4965 // we return OS_OK indicating we awoke via unpark().
4966 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4967 return (v >= 0) ? OS_OK : OS_TIMEOUT;
4968 }
4969
4970 void os::PlatformEvent::park() {
4971 // Transitions for _Event:
4972 // -1 => -1 : illegal
4973 // 1 => 0 : pass - return immediately
4974 // 0 => -1 : block; then set _Event to 0 before returning
4975
4976 guarantee(_ParkHandle != NULL, "Invariant");
4977 // Invariant: Only the thread associated with the Event/PlatformEvent
4978 // may call park().
4979 // Consider: use atomic decrement instead of CAS-loop
4980 int v;
4981 for (;;) {
4982 v = _Event;
4983 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4984 }
4985 guarantee((v == 0) || (v == 1), "invariant");
4986 if (v != 0) return;
4987
4988 // Do this the hard way by blocking ...
4989 // TODO: consider a brief spin here, gated on the success of recent
4990 // spin attempts by this thread.
4991 while (_Event < 0) {
4992 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
4993 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
4994 }
4995
4996 // Usually we'll find _Event == 0 at this point, but as
4997 // an optional optimization we clear it, just in case can
4998 // multiple unpark() operations drove _Event up to 1.
4999 _Event = 0;
5000 OrderAccess::fence();
5001 guarantee(_Event >= 0, "invariant");
5002 }
5003
5004 void os::PlatformEvent::unpark() {
5005 guarantee(_ParkHandle != NULL, "Invariant");
5006
5007 // Transitions for _Event:
5008 // 0 => 1 : just return
5009 // 1 => 1 : just return
5010 // -1 => either 0 or 1; must signal target thread
5011 // That is, we can safely transition _Event from -1 to either
5012 // 0 or 1.
5013 // See also: "Semaphores in Plan 9" by Mullender & Cox
5014 //
5015 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5016 // that it will take two back-to-back park() calls for the owning
5017 // thread to block. This has the benefit of forcing a spurious return
5018 // from the first park() call after an unpark() call which will help
5019 // shake out uses of park() and unpark() without condition variables.
5020
5021 if (Atomic::xchg(1, &_Event) >= 0) return;
5022
5023 ::SetEvent(_ParkHandle);
5024 }
5025
5026
5027 // JSR166
5028 // -------------------------------------------------------
5029
5030 // The Windows implementation of Park is very straightforward: Basic
5031 // operations on Win32 Events turn out to have the right semantics to
5032 // use them directly. We opportunistically resuse the event inherited
5033 // from Monitor.
5034
5035 void Parker::park(bool isAbsolute, jlong time) {
5036 guarantee(_ParkEvent != NULL, "invariant");
5037 // First, demultiplex/decode time arguments
5038 if (time < 0) { // don't wait
5039 return;
5040 } else if (time == 0 && !isAbsolute) {
5041 time = INFINITE;
5042 } else if (isAbsolute) {
5043 time -= os::javaTimeMillis(); // convert to relative time
5044 if (time <= 0) { // already elapsed
5045 return;
5046 }
5047 } else { // relative
5048 time /= 1000000; // Must coarsen from nanos to millis
5049 if (time == 0) { // Wait for the minimal time unit if zero
5050 time = 1;
5051 }
5052 }
5053
5054 JavaThread* thread = JavaThread::current();
5055
5056 // Don't wait if interrupted or already triggered
5057 if (Thread::is_interrupted(thread, false) ||
5058 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5059 ResetEvent(_ParkEvent);
5060 return;
5061 } else {
5062 ThreadBlockInVM tbivm(thread);
5063 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5064 thread->set_suspend_equivalent();
5065
5066 WaitForSingleObject(_ParkEvent, time);
5067 ResetEvent(_ParkEvent);
5068
5069 // If externally suspended while waiting, re-suspend
5070 if (thread->handle_special_suspend_equivalent_condition()) {
5071 thread->java_suspend_self();
5072 }
5073 }
5074 }
5075
5076 void Parker::unpark() {
5077 guarantee(_ParkEvent != NULL, "invariant");
5078 SetEvent(_ParkEvent);
5079 }
5080
5081 // Run the specified command in a separate process. Return its exit value,
5082 // or -1 on failure (e.g. can't create a new process).
5083 int os::fork_and_exec(char* cmd) {
5084 STARTUPINFO si;
5085 PROCESS_INFORMATION pi;
5086 DWORD exit_code;
5087
5088 char * cmd_string;
5089 char * cmd_prefix = "cmd /C ";
5090 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5091 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5092 if (cmd_string == NULL) {
5093 return -1;
5094 }
5095 cmd_string[0] = '\0';
5096 strcat(cmd_string, cmd_prefix);
5097 strcat(cmd_string, cmd);
5098
5099 // now replace all '\n' with '&'
5100 char * substring = cmd_string;
5101 while ((substring = strchr(substring, '\n')) != NULL) {
5102 substring[0] = '&';
5103 substring++;
5104 }
5105 memset(&si, 0, sizeof(si));
5106 si.cb = sizeof(si);
5107 memset(&pi, 0, sizeof(pi));
5108 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5109 cmd_string, // command line
5110 NULL, // process security attribute
5111 NULL, // thread security attribute
5112 TRUE, // inherits system handles
5113 0, // no creation flags
5114 NULL, // use parent's environment block
5115 NULL, // use parent's starting directory
5116 &si, // (in) startup information
5117 &pi); // (out) process information
5118
5119 if (rslt) {
5120 // Wait until child process exits.
5121 WaitForSingleObject(pi.hProcess, INFINITE);
5122
5123 GetExitCodeProcess(pi.hProcess, &exit_code);
5124
5125 // Close process and thread handles.
5126 CloseHandle(pi.hProcess);
5127 CloseHandle(pi.hThread);
5128 } else {
5129 exit_code = -1;
5130 }
5131
5132 FREE_C_HEAP_ARRAY(char, cmd_string);
5133 return (int)exit_code;
5134 }
5135
5136 bool os::find(address addr, outputStream* st) {
5137 int offset = -1;
5138 bool result = false;
5139 char buf[256];
5140 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5141 st->print(PTR_FORMAT " ", addr);
5142 if (strlen(buf) < sizeof(buf) - 1) {
5143 char* p = strrchr(buf, '\\');
5144 if (p) {
5145 st->print("%s", p + 1);
5146 } else {
5147 st->print("%s", buf);
5148 }
5149 } else {
5150 // The library name is probably truncated. Let's omit the library name.
5151 // See also JDK-8147512.
5152 }
5153 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5154 st->print("::%s + 0x%x", buf, offset);
5155 }
5156 st->cr();
5157 result = true;
5158 }
5159 return result;
5160 }
5161
5162 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5163 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5164
5165 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5166 JavaThread* thread = JavaThread::current();
5167 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5168 address addr = (address) exceptionRecord->ExceptionInformation[1];
5169
5170 if (os::is_memory_serialize_page(thread, addr)) {
5171 return EXCEPTION_CONTINUE_EXECUTION;
5172 }
5173 }
5174
5175 return EXCEPTION_CONTINUE_SEARCH;
5176 }
5177
5178 // We don't build a headless jre for Windows
5179 bool os::is_headless_jre() { return false; }
5180
5181 static jint initSock() {
5182 WSADATA wsadata;
5183
5184 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5185 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5186 ::GetLastError());
5187 return JNI_ERR;
5188 }
5189 return JNI_OK;
5190 }
5191
5192 struct hostent* os::get_host_by_name(char* name) {
5193 return (struct hostent*)gethostbyname(name);
5194 }
5195
5196 int os::socket_close(int fd) {
5197 return ::closesocket(fd);
5198 }
5199
5200 int os::socket(int domain, int type, int protocol) {
5201 return ::socket(domain, type, protocol);
5202 }
5203
5204 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5205 return ::connect(fd, him, len);
5206 }
5207
5208 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5209 return ::recv(fd, buf, (int)nBytes, flags);
5210 }
5211
5212 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5213 return ::send(fd, buf, (int)nBytes, flags);
5214 }
5215
5216 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5217 return ::send(fd, buf, (int)nBytes, flags);
5218 }
5219
5220 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5221 #if defined(IA32)
5222 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5223 #elif defined (AMD64)
5224 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5225 #endif
5226
5227 // returns true if thread could be suspended,
5228 // false otherwise
5229 static bool do_suspend(HANDLE* h) {
5230 if (h != NULL) {
5231 if (SuspendThread(*h) != ~0) {
5232 return true;
5233 }
5234 }
5235 return false;
5236 }
5237
5238 // resume the thread
5239 // calling resume on an active thread is a no-op
5240 static void do_resume(HANDLE* h) {
5241 if (h != NULL) {
5242 ResumeThread(*h);
5243 }
5244 }
5245
5246 // retrieve a suspend/resume context capable handle
5247 // from the tid. Caller validates handle return value.
5248 void get_thread_handle_for_extended_context(HANDLE* h,
5249 OSThread::thread_id_t tid) {
5250 if (h != NULL) {
5251 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5252 }
5253 }
5254
5255 // Thread sampling implementation
5256 //
5257 void os::SuspendedThreadTask::internal_do_task() {
5258 CONTEXT ctxt;
5259 HANDLE h = NULL;
5260
5261 // get context capable handle for thread
5262 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5263
5264 // sanity
5265 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5266 return;
5267 }
5268
5269 // suspend the thread
5270 if (do_suspend(&h)) {
5271 ctxt.ContextFlags = sampling_context_flags;
5272 // get thread context
5273 GetThreadContext(h, &ctxt);
5274 SuspendedThreadTaskContext context(_thread, &ctxt);
5275 // pass context to Thread Sampling impl
5276 do_task(context);
5277 // resume thread
5278 do_resume(&h);
5279 }
5280
5281 // close handle
5282 CloseHandle(h);
5283 }
5284
5285 bool os::start_debugging(char *buf, int buflen) {
5286 int len = (int)strlen(buf);
5287 char *p = &buf[len];
5288
5289 jio_snprintf(p, buflen-len,
5290 "\n\n"
5291 "Do you want to debug the problem?\n\n"
5292 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5293 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5294 "Otherwise, select 'No' to abort...",
5295 os::current_process_id(), os::current_thread_id());
5296
5297 bool yes = os::message_box("Unexpected Error", buf);
5298
5299 if (yes) {
5300 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5301 // exception. If VM is running inside a debugger, the debugger will
5302 // catch the exception. Otherwise, the breakpoint exception will reach
5303 // the default windows exception handler, which can spawn a debugger and
5304 // automatically attach to the dying VM.
5305 os::breakpoint();
5306 yes = false;
5307 }
5308 return yes;
5309 }
5310
5311 void* os::get_default_process_handle() {
5312 return (void*)GetModuleHandle(NULL);
5313 }
5314
5315 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5316 // which is used to find statically linked in agents.
5317 // Additionally for windows, takes into account __stdcall names.
5318 // Parameters:
5319 // sym_name: Symbol in library we are looking for
5320 // lib_name: Name of library to look in, NULL for shared libs.
5321 // is_absolute_path == true if lib_name is absolute path to agent
5322 // such as "C:/a/b/L.dll"
5323 // == false if only the base name of the library is passed in
5324 // such as "L"
5325 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5326 bool is_absolute_path) {
5327 char *agent_entry_name;
5328 size_t len;
5329 size_t name_len;
5330 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5331 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5332 const char *start;
5333
5334 if (lib_name != NULL) {
5335 len = name_len = strlen(lib_name);
5336 if (is_absolute_path) {
5337 // Need to strip path, prefix and suffix
5338 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5339 lib_name = ++start;
5340 } else {
5341 // Need to check for drive prefix
5342 if ((start = strchr(lib_name, ':')) != NULL) {
5343 lib_name = ++start;
5344 }
5345 }
5346 if (len <= (prefix_len + suffix_len)) {
5347 return NULL;
5348 }
5349 lib_name += prefix_len;
5350 name_len = strlen(lib_name) - suffix_len;
5351 }
5352 }
5353 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5354 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5355 if (agent_entry_name == NULL) {
5356 return NULL;
5357 }
5358 if (lib_name != NULL) {
5359 const char *p = strrchr(sym_name, '@');
5360 if (p != NULL && p != sym_name) {
5361 // sym_name == _Agent_OnLoad@XX
5362 strncpy(agent_entry_name, sym_name, (p - sym_name));
5363 agent_entry_name[(p-sym_name)] = '\0';
5364 // agent_entry_name == _Agent_OnLoad
5365 strcat(agent_entry_name, "_");
5366 strncat(agent_entry_name, lib_name, name_len);
5367 strcat(agent_entry_name, p);
5368 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5369 } else {
5370 strcpy(agent_entry_name, sym_name);
5371 strcat(agent_entry_name, "_");
5372 strncat(agent_entry_name, lib_name, name_len);
5373 }
5374 } else {
5375 strcpy(agent_entry_name, sym_name);
5376 }
5377 return agent_entry_name;
5378 }
5379
5380 #ifndef PRODUCT
5381
5382 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5383 // contiguous memory block at a particular address.
5384 // The test first tries to find a good approximate address to allocate at by using the same
5385 // method to allocate some memory at any address. The test then tries to allocate memory in
5386 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5387 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5388 // the previously allocated memory is available for allocation. The only actual failure
5389 // that is reported is when the test tries to allocate at a particular location but gets a
5390 // different valid one. A NULL return value at this point is not considered an error but may
5391 // be legitimate.
5392 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5393 void TestReserveMemorySpecial_test() {
5394 if (!UseLargePages) {
5395 if (VerboseInternalVMTests) {
5396 tty->print("Skipping test because large pages are disabled");
5397 }
5398 return;
5399 }
5400 // save current value of globals
5401 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5402 bool old_use_numa_interleaving = UseNUMAInterleaving;
5403
5404 // set globals to make sure we hit the correct code path
5405 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5406
5407 // do an allocation at an address selected by the OS to get a good one.
5408 const size_t large_allocation_size = os::large_page_size() * 4;
5409 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5410 if (result == NULL) {
5411 if (VerboseInternalVMTests) {
5412 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5413 large_allocation_size);
5414 }
5415 } else {
5416 os::release_memory_special(result, large_allocation_size);
5417
5418 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5419 // we managed to get it once.
5420 const size_t expected_allocation_size = os::large_page_size();
5421 char* expected_location = result + os::large_page_size();
5422 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5423 if (actual_location == NULL) {
5424 if (VerboseInternalVMTests) {
5425 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5426 expected_location, large_allocation_size);
5427 }
5428 } else {
5429 // release memory
5430 os::release_memory_special(actual_location, expected_allocation_size);
5431 // only now check, after releasing any memory to avoid any leaks.
5432 assert(actual_location == expected_location,
5433 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5434 expected_location, expected_allocation_size, actual_location);
5435 }
5436 }
5437
5438 // restore globals
5439 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5440 UseNUMAInterleaving = old_use_numa_interleaving;
5441 }
5442 #endif // PRODUCT
5443
5444 /*
5445 All the defined signal names for Windows.
5446
5447 NOTE that not all of these names are accepted by FindSignal!
5448
5449 For various reasons some of these may be rejected at runtime.
5450
5451 Here are the names currently accepted by a user of sun.misc.Signal with
5452 1.4.1 (ignoring potential interaction with use of chaining, etc):
5453
5454 (LIST TBD)
5455
5456 */
5457 int os::get_signal_number(const char* name) {
5458 static const struct {
5459 char* name;
5460 int number;
5461 } siglabels [] =
5462 // derived from version 6.0 VC98/include/signal.h
5463 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5464 "FPE", SIGFPE, // floating point exception
5465 "SEGV", SIGSEGV, // segment violation
5466 "INT", SIGINT, // interrupt
5467 "TERM", SIGTERM, // software term signal from kill
5468 "BREAK", SIGBREAK, // Ctrl-Break sequence
5469 "ILL", SIGILL}; // illegal instruction
5470 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5471 if (strcmp(name, siglabels[i].name) == 0) {
5472 return siglabels[i].number;
5473 }
5474 }
5475 return -1;
5476 }
5477
5478 // Fast current thread access
5479
5480 int os::win32::_thread_ptr_offset = 0;
5481
5482 static void call_wrapper_dummy() {}
5483
5484 // We need to call the os_exception_wrapper once so that it sets
5485 // up the offset from FS of the thread pointer.
5486 void os::win32::initialize_thread_ptr_offset() {
5487 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5488 NULL, NULL, NULL, NULL);
5489 }