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