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 (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2491 CodeBlob* cb;
2492 CompiledMethod* nm;
2493 JavaThread* thread = (JavaThread*)t;
2494 if (in_java) {
2495 cb = CodeCache::find_blob_unsafe(pc);
2496 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2497 }
2498 if (thread->doing_unsafe_access() || (nm != NULL && nm->has_unsafe_access())) {
2499 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, (address)Assembler::locate_next_instruction(pc)));
2500 }
2501 }
2502
2503 if (in_java) {
2504 switch (exception_code) {
2505 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2506 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2507
2508 case EXCEPTION_INT_OVERFLOW:
2509 return Handle_IDiv_Exception(exceptionInfo);
2510
2511 } // switch
2512 }
2513 if (((thread->thread_state() == _thread_in_Java) ||
2514 (thread->thread_state() == _thread_in_native)) &&
2515 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2516 LONG result=Handle_FLT_Exception(exceptionInfo);
2517 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2518 }
2519 }
2520
2521 if (exception_code != EXCEPTION_BREAKPOINT) {
2522 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2523 exceptionInfo->ContextRecord);
2524 }
2525 return EXCEPTION_CONTINUE_SEARCH;
2526 }
2527
2528 #ifndef _WIN64
2529 // Special care for fast JNI accessors.
2530 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2531 // the heap gets shrunk before the field access.
2532 // Need to install our own structured exception handler since native code may
2533 // install its own.
2534 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2535 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2536 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2537 address pc = (address) exceptionInfo->ContextRecord->Eip;
2538 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2539 if (addr != (address)-1) {
2540 return Handle_Exception(exceptionInfo, addr);
2541 }
2542 }
2543 return EXCEPTION_CONTINUE_SEARCH;
2544 }
2545
2546 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2547 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2548 jobject obj, \
2549 jfieldID fieldID) { \
2550 __try { \
2551 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2552 obj, \
2553 fieldID); \
2554 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2555 _exception_info())) { \
2556 } \
2557 return 0; \
2558 }
2559
2560 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2561 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2562 DEFINE_FAST_GETFIELD(jchar, char, Char)
2563 DEFINE_FAST_GETFIELD(jshort, short, Short)
2564 DEFINE_FAST_GETFIELD(jint, int, Int)
2565 DEFINE_FAST_GETFIELD(jlong, long, Long)
2566 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2567 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2568
2569 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2570 switch (type) {
2571 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2572 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2573 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2574 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2575 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2576 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2577 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2578 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2579 default: ShouldNotReachHere();
2580 }
2581 return (address)-1;
2582 }
2583 #endif
2584
2585 // Virtual Memory
2586
2587 int os::vm_page_size() { return os::win32::vm_page_size(); }
2588 int os::vm_allocation_granularity() {
2589 return os::win32::vm_allocation_granularity();
2590 }
2591
2592 // Windows large page support is available on Windows 2003. In order to use
2593 // large page memory, the administrator must first assign additional privilege
2594 // to the user:
2595 // + select Control Panel -> Administrative Tools -> Local Security Policy
2596 // + select Local Policies -> User Rights Assignment
2597 // + double click "Lock pages in memory", add users and/or groups
2598 // + reboot
2599 // Note the above steps are needed for administrator as well, as administrators
2600 // by default do not have the privilege to lock pages in memory.
2601 //
2602 // Note about Windows 2003: although the API supports committing large page
2603 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2604 // scenario, I found through experiment it only uses large page if the entire
2605 // memory region is reserved and committed in a single VirtualAlloc() call.
2606 // This makes Windows large page support more or less like Solaris ISM, in
2607 // that the entire heap must be committed upfront. This probably will change
2608 // in the future, if so the code below needs to be revisited.
2609
2610 #ifndef MEM_LARGE_PAGES
2611 #define MEM_LARGE_PAGES 0x20000000
2612 #endif
2613
2614 static HANDLE _hProcess;
2615 static HANDLE _hToken;
2616
2617 // Container for NUMA node list info
2618 class NUMANodeListHolder {
2619 private:
2620 int *_numa_used_node_list; // allocated below
2621 int _numa_used_node_count;
2622
2623 void free_node_list() {
2624 if (_numa_used_node_list != NULL) {
2625 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2626 }
2627 }
2628
2629 public:
2630 NUMANodeListHolder() {
2631 _numa_used_node_count = 0;
2632 _numa_used_node_list = NULL;
2633 // do rest of initialization in build routine (after function pointers are set up)
2634 }
2635
2636 ~NUMANodeListHolder() {
2637 free_node_list();
2638 }
2639
2640 bool build() {
2641 DWORD_PTR proc_aff_mask;
2642 DWORD_PTR sys_aff_mask;
2643 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2644 ULONG highest_node_number;
2645 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2646 free_node_list();
2647 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2648 for (unsigned int i = 0; i <= highest_node_number; i++) {
2649 ULONGLONG proc_mask_numa_node;
2650 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2651 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2652 _numa_used_node_list[_numa_used_node_count++] = i;
2653 }
2654 }
2655 return (_numa_used_node_count > 1);
2656 }
2657
2658 int get_count() { return _numa_used_node_count; }
2659 int get_node_list_entry(int n) {
2660 // for indexes out of range, returns -1
2661 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2662 }
2663
2664 } numa_node_list_holder;
2665
2666
2667
2668 static size_t _large_page_size = 0;
2669
2670 static bool request_lock_memory_privilege() {
2671 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2672 os::current_process_id());
2673
2674 LUID luid;
2675 if (_hProcess != NULL &&
2676 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2677 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2678
2679 TOKEN_PRIVILEGES tp;
2680 tp.PrivilegeCount = 1;
2681 tp.Privileges[0].Luid = luid;
2682 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2683
2684 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2685 // privilege. Check GetLastError() too. See MSDN document.
2686 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2687 (GetLastError() == ERROR_SUCCESS)) {
2688 return true;
2689 }
2690 }
2691
2692 return false;
2693 }
2694
2695 static void cleanup_after_large_page_init() {
2696 if (_hProcess) CloseHandle(_hProcess);
2697 _hProcess = NULL;
2698 if (_hToken) CloseHandle(_hToken);
2699 _hToken = NULL;
2700 }
2701
2702 static bool numa_interleaving_init() {
2703 bool success = false;
2704 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2705
2706 // print a warning if UseNUMAInterleaving flag is specified on command line
2707 bool warn_on_failure = use_numa_interleaving_specified;
2708 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2709
2710 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2711 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2712 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2713
2714 if (numa_node_list_holder.build()) {
2715 if (log_is_enabled(Debug, os, cpu)) {
2716 Log(os, cpu) log;
2717 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2718 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2719 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2720 }
2721 }
2722 success = true;
2723 } else {
2724 WARN("Process does not cover multiple NUMA nodes.");
2725 }
2726 if (!success) {
2727 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2728 }
2729 return success;
2730 #undef WARN
2731 }
2732
2733 // this routine is used whenever we need to reserve a contiguous VA range
2734 // but we need to make separate VirtualAlloc calls for each piece of the range
2735 // Reasons for doing this:
2736 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2737 // * UseNUMAInterleaving requires a separate node for each piece
2738 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2739 DWORD prot,
2740 bool should_inject_error = false) {
2741 char * p_buf;
2742 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2743 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2744 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2745
2746 // first reserve enough address space in advance since we want to be
2747 // able to break a single contiguous virtual address range into multiple
2748 // large page commits but WS2003 does not allow reserving large page space
2749 // so we just use 4K pages for reserve, this gives us a legal contiguous
2750 // address space. then we will deallocate that reservation, and re alloc
2751 // using large pages
2752 const size_t size_of_reserve = bytes + chunk_size;
2753 if (bytes > size_of_reserve) {
2754 // Overflowed.
2755 return NULL;
2756 }
2757 p_buf = (char *) VirtualAlloc(addr,
2758 size_of_reserve, // size of Reserve
2759 MEM_RESERVE,
2760 PAGE_READWRITE);
2761 // If reservation failed, return NULL
2762 if (p_buf == NULL) return NULL;
2763 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2764 os::release_memory(p_buf, bytes + chunk_size);
2765
2766 // we still need to round up to a page boundary (in case we are using large pages)
2767 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2768 // instead we handle this in the bytes_to_rq computation below
2769 p_buf = align_up(p_buf, page_size);
2770
2771 // now go through and allocate one chunk at a time until all bytes are
2772 // allocated
2773 size_t bytes_remaining = bytes;
2774 // An overflow of align_up() would have been caught above
2775 // in the calculation of size_of_reserve.
2776 char * next_alloc_addr = p_buf;
2777 HANDLE hProc = GetCurrentProcess();
2778
2779 #ifdef ASSERT
2780 // Variable for the failure injection
2781 int ran_num = os::random();
2782 size_t fail_after = ran_num % bytes;
2783 #endif
2784
2785 int count=0;
2786 while (bytes_remaining) {
2787 // select bytes_to_rq to get to the next chunk_size boundary
2788
2789 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2790 // Note allocate and commit
2791 char * p_new;
2792
2793 #ifdef ASSERT
2794 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2795 #else
2796 const bool inject_error_now = false;
2797 #endif
2798
2799 if (inject_error_now) {
2800 p_new = NULL;
2801 } else {
2802 if (!UseNUMAInterleaving) {
2803 p_new = (char *) VirtualAlloc(next_alloc_addr,
2804 bytes_to_rq,
2805 flags,
2806 prot);
2807 } else {
2808 // get the next node to use from the used_node_list
2809 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2810 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2811 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2812 }
2813 }
2814
2815 if (p_new == NULL) {
2816 // Free any allocated pages
2817 if (next_alloc_addr > p_buf) {
2818 // Some memory was committed so release it.
2819 size_t bytes_to_release = bytes - bytes_remaining;
2820 // NMT has yet to record any individual blocks, so it
2821 // need to create a dummy 'reserve' record to match
2822 // the release.
2823 MemTracker::record_virtual_memory_reserve((address)p_buf,
2824 bytes_to_release, CALLER_PC);
2825 os::release_memory(p_buf, bytes_to_release);
2826 }
2827 #ifdef ASSERT
2828 if (should_inject_error) {
2829 log_develop_debug(pagesize)("Reserving pages individually failed.");
2830 }
2831 #endif
2832 return NULL;
2833 }
2834
2835 bytes_remaining -= bytes_to_rq;
2836 next_alloc_addr += bytes_to_rq;
2837 count++;
2838 }
2839 // Although the memory is allocated individually, it is returned as one.
2840 // NMT records it as one block.
2841 if ((flags & MEM_COMMIT) != 0) {
2842 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2843 } else {
2844 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2845 }
2846
2847 // made it this far, success
2848 return p_buf;
2849 }
2850
2851
2852
2853 void os::large_page_init() {
2854 if (!UseLargePages) return;
2855
2856 // print a warning if any large page related flag is specified on command line
2857 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2858 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2859 bool success = false;
2860
2861 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2862 if (request_lock_memory_privilege()) {
2863 size_t s = GetLargePageMinimum();
2864 if (s) {
2865 #if defined(IA32) || defined(AMD64)
2866 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2867 WARN("JVM cannot use large pages bigger than 4mb.");
2868 } else {
2869 #endif
2870 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2871 _large_page_size = LargePageSizeInBytes;
2872 } else {
2873 _large_page_size = s;
2874 }
2875 success = true;
2876 #if defined(IA32) || defined(AMD64)
2877 }
2878 #endif
2879 } else {
2880 WARN("Large page is not supported by the processor.");
2881 }
2882 } else {
2883 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2884 }
2885 #undef WARN
2886
2887 const size_t default_page_size = (size_t) vm_page_size();
2888 if (success && _large_page_size > default_page_size) {
2889 _page_sizes[0] = _large_page_size;
2890 _page_sizes[1] = default_page_size;
2891 _page_sizes[2] = 0;
2892 }
2893
2894 cleanup_after_large_page_init();
2895 UseLargePages = success;
2896 }
2897
2898 // On win32, one cannot release just a part of reserved memory, it's an
2899 // all or nothing deal. When we split a reservation, we must break the
2900 // reservation into two reservations.
2901 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2902 bool realloc) {
2903 if (size > 0) {
2904 release_memory(base, size);
2905 if (realloc) {
2906 reserve_memory(split, base);
2907 }
2908 if (size != split) {
2909 reserve_memory(size - split, base + split);
2910 }
2911 }
2912 }
2913
2914 // Multiple threads can race in this code but it's not possible to unmap small sections of
2915 // virtual space to get requested alignment, like posix-like os's.
2916 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
2917 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
2918 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
2919 "Alignment must be a multiple of allocation granularity (page size)");
2920 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
2921
2922 size_t extra_size = size + alignment;
2923 assert(extra_size >= size, "overflow, size is too large to allow alignment");
2924
2925 char* aligned_base = NULL;
2926
2927 do {
2928 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
2929 if (extra_base == NULL) {
2930 return NULL;
2931 }
2932 // Do manual alignment
2933 aligned_base = align_up(extra_base, alignment);
2934
2935 os::release_memory(extra_base, extra_size);
2936
2937 aligned_base = os::reserve_memory(size, aligned_base);
2938
2939 } while (aligned_base == NULL);
2940
2941 return aligned_base;
2942 }
2943
2944 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2945 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2946 "reserve alignment");
2947 assert(bytes % os::vm_page_size() == 0, "reserve page size");
2948 char* res;
2949 // note that if UseLargePages is on, all the areas that require interleaving
2950 // will go thru reserve_memory_special rather than thru here.
2951 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
2952 if (!use_individual) {
2953 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2954 } else {
2955 elapsedTimer reserveTimer;
2956 if (Verbose && PrintMiscellaneous) reserveTimer.start();
2957 // in numa interleaving, we have to allocate pages individually
2958 // (well really chunks of NUMAInterleaveGranularity size)
2959 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
2960 if (res == NULL) {
2961 warning("NUMA page allocation failed");
2962 }
2963 if (Verbose && PrintMiscellaneous) {
2964 reserveTimer.stop();
2965 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
2966 reserveTimer.milliseconds(), reserveTimer.ticks());
2967 }
2968 }
2969 assert(res == NULL || addr == NULL || addr == res,
2970 "Unexpected address from reserve.");
2971
2972 return res;
2973 }
2974
2975 // Reserve memory at an arbitrary address, only if that area is
2976 // available (and not reserved for something else).
2977 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2978 // Windows os::reserve_memory() fails of the requested address range is
2979 // not avilable.
2980 return reserve_memory(bytes, requested_addr);
2981 }
2982
2983 size_t os::large_page_size() {
2984 return _large_page_size;
2985 }
2986
2987 bool os::can_commit_large_page_memory() {
2988 // Windows only uses large page memory when the entire region is reserved
2989 // and committed in a single VirtualAlloc() call. This may change in the
2990 // future, but with Windows 2003 it's not possible to commit on demand.
2991 return false;
2992 }
2993
2994 bool os::can_execute_large_page_memory() {
2995 return true;
2996 }
2997
2998 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
2999 bool exec) {
3000 assert(UseLargePages, "only for large pages");
3001
3002 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3003 return NULL; // Fallback to small pages.
3004 }
3005
3006 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3007 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3008
3009 // with large pages, there are two cases where we need to use Individual Allocation
3010 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3011 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3012 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3013 log_debug(pagesize)("Reserving large pages individually.");
3014
3015 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3016 if (p_buf == NULL) {
3017 // give an appropriate warning message
3018 if (UseNUMAInterleaving) {
3019 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3020 }
3021 if (UseLargePagesIndividualAllocation) {
3022 warning("Individually allocated large pages failed, "
3023 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3024 }
3025 return NULL;
3026 }
3027
3028 return p_buf;
3029
3030 } else {
3031 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3032
3033 // normal policy just allocate it all at once
3034 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3035 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3036 if (res != NULL) {
3037 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3038 }
3039
3040 return res;
3041 }
3042 }
3043
3044 bool os::release_memory_special(char* base, size_t bytes) {
3045 assert(base != NULL, "Sanity check");
3046 return release_memory(base, bytes);
3047 }
3048
3049 void os::print_statistics() {
3050 }
3051
3052 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3053 int err = os::get_last_error();
3054 char buf[256];
3055 size_t buf_len = os::lasterror(buf, sizeof(buf));
3056 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3057 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3058 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3059 }
3060
3061 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3062 if (bytes == 0) {
3063 // Don't bother the OS with noops.
3064 return true;
3065 }
3066 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3067 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3068 // Don't attempt to print anything if the OS call fails. We're
3069 // probably low on resources, so the print itself may cause crashes.
3070
3071 // unless we have NUMAInterleaving enabled, the range of a commit
3072 // is always within a reserve covered by a single VirtualAlloc
3073 // in that case we can just do a single commit for the requested size
3074 if (!UseNUMAInterleaving) {
3075 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3076 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3077 return false;
3078 }
3079 if (exec) {
3080 DWORD oldprot;
3081 // Windows doc says to use VirtualProtect to get execute permissions
3082 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3083 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3084 return false;
3085 }
3086 }
3087 return true;
3088 } else {
3089
3090 // when NUMAInterleaving is enabled, the commit might cover a range that
3091 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3092 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3093 // returns represents the number of bytes that can be committed in one step.
3094 size_t bytes_remaining = bytes;
3095 char * next_alloc_addr = addr;
3096 while (bytes_remaining > 0) {
3097 MEMORY_BASIC_INFORMATION alloc_info;
3098 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3099 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3100 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3101 PAGE_READWRITE) == NULL) {
3102 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3103 exec);)
3104 return false;
3105 }
3106 if (exec) {
3107 DWORD oldprot;
3108 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3109 PAGE_EXECUTE_READWRITE, &oldprot)) {
3110 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3111 exec);)
3112 return false;
3113 }
3114 }
3115 bytes_remaining -= bytes_to_rq;
3116 next_alloc_addr += bytes_to_rq;
3117 }
3118 }
3119 // if we made it this far, return true
3120 return true;
3121 }
3122
3123 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3124 bool exec) {
3125 // alignment_hint is ignored on this OS
3126 return pd_commit_memory(addr, size, exec);
3127 }
3128
3129 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3130 const char* mesg) {
3131 assert(mesg != NULL, "mesg must be specified");
3132 if (!pd_commit_memory(addr, size, exec)) {
3133 warn_fail_commit_memory(addr, size, exec);
3134 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3135 }
3136 }
3137
3138 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3139 size_t alignment_hint, bool exec,
3140 const char* mesg) {
3141 // alignment_hint is ignored on this OS
3142 pd_commit_memory_or_exit(addr, size, exec, mesg);
3143 }
3144
3145 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3146 if (bytes == 0) {
3147 // Don't bother the OS with noops.
3148 return true;
3149 }
3150 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3151 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3152 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3153 }
3154
3155 bool os::pd_release_memory(char* addr, size_t bytes) {
3156 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3157 }
3158
3159 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3160 return os::commit_memory(addr, size, !ExecMem);
3161 }
3162
3163 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3164 return os::uncommit_memory(addr, size);
3165 }
3166
3167 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3168 uint count = 0;
3169 bool ret = false;
3170 size_t bytes_remaining = bytes;
3171 char * next_protect_addr = addr;
3172
3173 // Use VirtualQuery() to get the chunk size.
3174 while (bytes_remaining) {
3175 MEMORY_BASIC_INFORMATION alloc_info;
3176 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3177 return false;
3178 }
3179
3180 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3181 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3182 // but we don't distinguish here as both cases are protected by same API.
3183 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3184 warning("Failed protecting pages individually for chunk #%u", count);
3185 if (!ret) {
3186 return false;
3187 }
3188
3189 bytes_remaining -= bytes_to_protect;
3190 next_protect_addr += bytes_to_protect;
3191 count++;
3192 }
3193 return ret;
3194 }
3195
3196 // Set protections specified
3197 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3198 bool is_committed) {
3199 unsigned int p = 0;
3200 switch (prot) {
3201 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3202 case MEM_PROT_READ: p = PAGE_READONLY; break;
3203 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3204 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3205 default:
3206 ShouldNotReachHere();
3207 }
3208
3209 DWORD old_status;
3210
3211 // Strange enough, but on Win32 one can change protection only for committed
3212 // memory, not a big deal anyway, as bytes less or equal than 64K
3213 if (!is_committed) {
3214 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3215 "cannot commit protection page");
3216 }
3217 // One cannot use os::guard_memory() here, as on Win32 guard page
3218 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3219 //
3220 // Pages in the region become guard pages. Any attempt to access a guard page
3221 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3222 // the guard page status. Guard pages thus act as a one-time access alarm.
3223 bool ret;
3224 if (UseNUMAInterleaving) {
3225 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3226 // so we must protect the chunks individually.
3227 ret = protect_pages_individually(addr, bytes, p, &old_status);
3228 } else {
3229 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3230 }
3231 #ifdef ASSERT
3232 if (!ret) {
3233 int err = os::get_last_error();
3234 char buf[256];
3235 size_t buf_len = os::lasterror(buf, sizeof(buf));
3236 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3237 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3238 buf_len != 0 ? buf : "<no_error_string>", err);
3239 }
3240 #endif
3241 return ret;
3242 }
3243
3244 bool os::guard_memory(char* addr, size_t bytes) {
3245 DWORD old_status;
3246 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3247 }
3248
3249 bool os::unguard_memory(char* addr, size_t bytes) {
3250 DWORD old_status;
3251 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3252 }
3253
3254 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3255 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3256 void os::numa_make_global(char *addr, size_t bytes) { }
3257 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3258 bool os::numa_topology_changed() { return false; }
3259 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3260 int os::numa_get_group_id() { return 0; }
3261 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3262 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3263 // Provide an answer for UMA systems
3264 ids[0] = 0;
3265 return 1;
3266 } else {
3267 // check for size bigger than actual groups_num
3268 size = MIN2(size, numa_get_groups_num());
3269 for (int i = 0; i < (int)size; i++) {
3270 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3271 }
3272 return size;
3273 }
3274 }
3275
3276 bool os::get_page_info(char *start, page_info* info) {
3277 return false;
3278 }
3279
3280 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3281 page_info* page_found) {
3282 return end;
3283 }
3284
3285 char* os::non_memory_address_word() {
3286 // Must never look like an address returned by reserve_memory,
3287 // even in its subfields (as defined by the CPU immediate fields,
3288 // if the CPU splits constants across multiple instructions).
3289 return (char*)-1;
3290 }
3291
3292 #define MAX_ERROR_COUNT 100
3293 #define SYS_THREAD_ERROR 0xffffffffUL
3294
3295 void os::pd_start_thread(Thread* thread) {
3296 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3297 // Returns previous suspend state:
3298 // 0: Thread was not suspended
3299 // 1: Thread is running now
3300 // >1: Thread is still suspended.
3301 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3302 }
3303
3304 class HighResolutionInterval : public CHeapObj<mtThread> {
3305 // The default timer resolution seems to be 10 milliseconds.
3306 // (Where is this written down?)
3307 // If someone wants to sleep for only a fraction of the default,
3308 // then we set the timer resolution down to 1 millisecond for
3309 // the duration of their interval.
3310 // We carefully set the resolution back, since otherwise we
3311 // seem to incur an overhead (3%?) that we don't need.
3312 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3313 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3314 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3315 // timeBeginPeriod() if the relative error exceeded some threshold.
3316 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3317 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3318 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3319 // resolution timers running.
3320 private:
3321 jlong resolution;
3322 public:
3323 HighResolutionInterval(jlong ms) {
3324 resolution = ms % 10L;
3325 if (resolution != 0) {
3326 MMRESULT result = timeBeginPeriod(1L);
3327 }
3328 }
3329 ~HighResolutionInterval() {
3330 if (resolution != 0) {
3331 MMRESULT result = timeEndPeriod(1L);
3332 }
3333 resolution = 0L;
3334 }
3335 };
3336
3337 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3338 jlong limit = (jlong) MAXDWORD;
3339
3340 while (ms > limit) {
3341 int res;
3342 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3343 return res;
3344 }
3345 ms -= limit;
3346 }
3347
3348 assert(thread == Thread::current(), "thread consistency check");
3349 OSThread* osthread = thread->osthread();
3350 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3351 int result;
3352 if (interruptable) {
3353 assert(thread->is_Java_thread(), "must be java thread");
3354 JavaThread *jt = (JavaThread *) thread;
3355 ThreadBlockInVM tbivm(jt);
3356
3357 jt->set_suspend_equivalent();
3358 // cleared by handle_special_suspend_equivalent_condition() or
3359 // java_suspend_self() via check_and_wait_while_suspended()
3360
3361 HANDLE events[1];
3362 events[0] = osthread->interrupt_event();
3363 HighResolutionInterval *phri=NULL;
3364 if (!ForceTimeHighResolution) {
3365 phri = new HighResolutionInterval(ms);
3366 }
3367 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3368 result = OS_TIMEOUT;
3369 } else {
3370 ResetEvent(osthread->interrupt_event());
3371 osthread->set_interrupted(false);
3372 result = OS_INTRPT;
3373 }
3374 delete phri; //if it is NULL, harmless
3375
3376 // were we externally suspended while we were waiting?
3377 jt->check_and_wait_while_suspended();
3378 } else {
3379 assert(!thread->is_Java_thread(), "must not be java thread");
3380 Sleep((long) ms);
3381 result = OS_TIMEOUT;
3382 }
3383 return result;
3384 }
3385
3386 // Short sleep, direct OS call.
3387 //
3388 // ms = 0, means allow others (if any) to run.
3389 //
3390 void os::naked_short_sleep(jlong ms) {
3391 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3392 Sleep(ms);
3393 }
3394
3395 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3396 void os::infinite_sleep() {
3397 while (true) { // sleep forever ...
3398 Sleep(100000); // ... 100 seconds at a time
3399 }
3400 }
3401
3402 typedef BOOL (WINAPI * STTSignature)(void);
3403
3404 void os::naked_yield() {
3405 // Consider passing back the return value from SwitchToThread().
3406 SwitchToThread();
3407 }
3408
3409 // Win32 only gives you access to seven real priorities at a time,
3410 // so we compress Java's ten down to seven. It would be better
3411 // if we dynamically adjusted relative priorities.
3412
3413 int os::java_to_os_priority[CriticalPriority + 1] = {
3414 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3415 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3416 THREAD_PRIORITY_LOWEST, // 2
3417 THREAD_PRIORITY_BELOW_NORMAL, // 3
3418 THREAD_PRIORITY_BELOW_NORMAL, // 4
3419 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3420 THREAD_PRIORITY_NORMAL, // 6
3421 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3422 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3423 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3424 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3425 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3426 };
3427
3428 int prio_policy1[CriticalPriority + 1] = {
3429 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3430 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3431 THREAD_PRIORITY_LOWEST, // 2
3432 THREAD_PRIORITY_BELOW_NORMAL, // 3
3433 THREAD_PRIORITY_BELOW_NORMAL, // 4
3434 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3435 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3436 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3437 THREAD_PRIORITY_HIGHEST, // 8
3438 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3439 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3440 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3441 };
3442
3443 static int prio_init() {
3444 // If ThreadPriorityPolicy is 1, switch tables
3445 if (ThreadPriorityPolicy == 1) {
3446 int i;
3447 for (i = 0; i < CriticalPriority + 1; i++) {
3448 os::java_to_os_priority[i] = prio_policy1[i];
3449 }
3450 }
3451 if (UseCriticalJavaThreadPriority) {
3452 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3453 }
3454 return 0;
3455 }
3456
3457 OSReturn os::set_native_priority(Thread* thread, int priority) {
3458 if (!UseThreadPriorities) return OS_OK;
3459 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3460 return ret ? OS_OK : OS_ERR;
3461 }
3462
3463 OSReturn os::get_native_priority(const Thread* const thread,
3464 int* priority_ptr) {
3465 if (!UseThreadPriorities) {
3466 *priority_ptr = java_to_os_priority[NormPriority];
3467 return OS_OK;
3468 }
3469 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3470 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3471 assert(false, "GetThreadPriority failed");
3472 return OS_ERR;
3473 }
3474 *priority_ptr = os_prio;
3475 return OS_OK;
3476 }
3477
3478
3479 // Hint to the underlying OS that a task switch would not be good.
3480 // Void return because it's a hint and can fail.
3481 void os::hint_no_preempt() {}
3482
3483 void os::interrupt(Thread* thread) {
3484 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3485 Threads_lock->owned_by_self(),
3486 "possibility of dangling Thread pointer");
3487
3488 OSThread* osthread = thread->osthread();
3489 osthread->set_interrupted(true);
3490 // More than one thread can get here with the same value of osthread,
3491 // resulting in multiple notifications. We do, however, want the store
3492 // to interrupted() to be visible to other threads before we post
3493 // the interrupt event.
3494 OrderAccess::release();
3495 SetEvent(osthread->interrupt_event());
3496 // For JSR166: unpark after setting status
3497 if (thread->is_Java_thread()) {
3498 ((JavaThread*)thread)->parker()->unpark();
3499 }
3500
3501 ParkEvent * ev = thread->_ParkEvent;
3502 if (ev != NULL) ev->unpark();
3503 }
3504
3505
3506 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3507 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3508 "possibility of dangling Thread pointer");
3509
3510 OSThread* osthread = thread->osthread();
3511 // There is no synchronization between the setting of the interrupt
3512 // and it being cleared here. It is critical - see 6535709 - that
3513 // we only clear the interrupt state, and reset the interrupt event,
3514 // if we are going to report that we were indeed interrupted - else
3515 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3516 // depending on the timing. By checking thread interrupt event to see
3517 // if the thread gets real interrupt thus prevent spurious wakeup.
3518 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3519 if (interrupted && clear_interrupted) {
3520 osthread->set_interrupted(false);
3521 ResetEvent(osthread->interrupt_event());
3522 } // Otherwise leave the interrupted state alone
3523
3524 return interrupted;
3525 }
3526
3527 // GetCurrentThreadId() returns DWORD
3528 intx os::current_thread_id() { return GetCurrentThreadId(); }
3529
3530 static int _initial_pid = 0;
3531
3532 int os::current_process_id() {
3533 return (_initial_pid ? _initial_pid : _getpid());
3534 }
3535
3536 int os::win32::_vm_page_size = 0;
3537 int os::win32::_vm_allocation_granularity = 0;
3538 int os::win32::_processor_type = 0;
3539 // Processor level is not available on non-NT systems, use vm_version instead
3540 int os::win32::_processor_level = 0;
3541 julong os::win32::_physical_memory = 0;
3542 size_t os::win32::_default_stack_size = 0;
3543
3544 intx os::win32::_os_thread_limit = 0;
3545 volatile intx os::win32::_os_thread_count = 0;
3546
3547 bool os::win32::_is_windows_server = false;
3548
3549 // 6573254
3550 // Currently, the bug is observed across all the supported Windows releases,
3551 // including the latest one (as of this writing - Windows Server 2012 R2)
3552 bool os::win32::_has_exit_bug = true;
3553
3554 void os::win32::initialize_system_info() {
3555 SYSTEM_INFO si;
3556 GetSystemInfo(&si);
3557 _vm_page_size = si.dwPageSize;
3558 _vm_allocation_granularity = si.dwAllocationGranularity;
3559 _processor_type = si.dwProcessorType;
3560 _processor_level = si.wProcessorLevel;
3561 set_processor_count(si.dwNumberOfProcessors);
3562
3563 MEMORYSTATUSEX ms;
3564 ms.dwLength = sizeof(ms);
3565
3566 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3567 // dwMemoryLoad (% of memory in use)
3568 GlobalMemoryStatusEx(&ms);
3569 _physical_memory = ms.ullTotalPhys;
3570
3571 if (FLAG_IS_DEFAULT(MaxRAM)) {
3572 // Adjust MaxRAM according to the maximum virtual address space available.
3573 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3574 }
3575
3576 OSVERSIONINFOEX oi;
3577 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3578 GetVersionEx((OSVERSIONINFO*)&oi);
3579 switch (oi.dwPlatformId) {
3580 case VER_PLATFORM_WIN32_NT:
3581 {
3582 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3583 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3584 oi.wProductType == VER_NT_SERVER) {
3585 _is_windows_server = true;
3586 }
3587 }
3588 break;
3589 default: fatal("Unknown platform");
3590 }
3591
3592 _default_stack_size = os::current_stack_size();
3593 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3594 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3595 "stack size not a multiple of page size");
3596
3597 initialize_performance_counter();
3598 }
3599
3600
3601 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3602 int ebuflen) {
3603 char path[MAX_PATH];
3604 DWORD size;
3605 DWORD pathLen = (DWORD)sizeof(path);
3606 HINSTANCE result = NULL;
3607
3608 // only allow library name without path component
3609 assert(strchr(name, '\\') == NULL, "path not allowed");
3610 assert(strchr(name, ':') == NULL, "path not allowed");
3611 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3612 jio_snprintf(ebuf, ebuflen,
3613 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3614 return NULL;
3615 }
3616
3617 // search system directory
3618 if ((size = GetSystemDirectory(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 // try Windows directory
3631 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3632 if (size >= pathLen) {
3633 return NULL; // truncated
3634 }
3635 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3636 return NULL; // truncated
3637 }
3638 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3639 return result;
3640 }
3641 }
3642
3643 jio_snprintf(ebuf, ebuflen,
3644 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3645 return NULL;
3646 }
3647
3648 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3649 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3650
3651 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3652 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3653 return TRUE;
3654 }
3655
3656 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3657 // Basic approach:
3658 // - Each exiting thread registers its intent to exit and then does so.
3659 // - A thread trying to terminate the process must wait for all
3660 // threads currently exiting to complete their exit.
3661
3662 if (os::win32::has_exit_bug()) {
3663 // The array holds handles of the threads that have started exiting by calling
3664 // _endthreadex().
3665 // Should be large enough to avoid blocking the exiting thread due to lack of
3666 // a free slot.
3667 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3668 static int handle_count = 0;
3669
3670 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3671 static CRITICAL_SECTION crit_sect;
3672 static volatile DWORD process_exiting = 0;
3673 int i, j;
3674 DWORD res;
3675 HANDLE hproc, hthr;
3676
3677 // We only attempt to register threads until a process exiting
3678 // thread manages to set the process_exiting flag. Any threads
3679 // that come through here after the process_exiting flag is set
3680 // are unregistered and will be caught in the SuspendThread()
3681 // infinite loop below.
3682 bool registered = false;
3683
3684 // The first thread that reached this point, initializes the critical section.
3685 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3686 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3687 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3688 if (what != EPT_THREAD) {
3689 // Atomically set process_exiting before the critical section
3690 // to increase the visibility between racing threads.
3691 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3692 }
3693 EnterCriticalSection(&crit_sect);
3694
3695 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3696 // Remove from the array those handles of the threads that have completed exiting.
3697 for (i = 0, j = 0; i < handle_count; ++i) {
3698 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3699 if (res == WAIT_TIMEOUT) {
3700 handles[j++] = handles[i];
3701 } else {
3702 if (res == WAIT_FAILED) {
3703 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3704 GetLastError(), __FILE__, __LINE__);
3705 }
3706 // Don't keep the handle, if we failed waiting for it.
3707 CloseHandle(handles[i]);
3708 }
3709 }
3710
3711 // If there's no free slot in the array of the kept handles, we'll have to
3712 // wait until at least one thread completes exiting.
3713 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3714 // Raise the priority of the oldest exiting thread to increase its chances
3715 // to complete sooner.
3716 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3717 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3718 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3719 i = (res - WAIT_OBJECT_0);
3720 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3721 for (; i < handle_count; ++i) {
3722 handles[i] = handles[i + 1];
3723 }
3724 } else {
3725 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3726 (res == WAIT_FAILED ? "failed" : "timed out"),
3727 GetLastError(), __FILE__, __LINE__);
3728 // Don't keep handles, if we failed waiting for them.
3729 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3730 CloseHandle(handles[i]);
3731 }
3732 handle_count = 0;
3733 }
3734 }
3735
3736 // Store a duplicate of the current thread handle in the array of handles.
3737 hproc = GetCurrentProcess();
3738 hthr = GetCurrentThread();
3739 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3740 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3741 warning("DuplicateHandle failed (%u) in %s: %d\n",
3742 GetLastError(), __FILE__, __LINE__);
3743
3744 // We can't register this thread (no more handles) so this thread
3745 // may be racing with a thread that is calling exit(). If the thread
3746 // that is calling exit() has managed to set the process_exiting
3747 // flag, then this thread will be caught in the SuspendThread()
3748 // infinite loop below which closes that race. A small timing
3749 // window remains before the process_exiting flag is set, but it
3750 // is only exposed when we are out of handles.
3751 } else {
3752 ++handle_count;
3753 registered = true;
3754
3755 // The current exiting thread has stored its handle in the array, and now
3756 // should leave the critical section before calling _endthreadex().
3757 }
3758
3759 } else if (what != EPT_THREAD && handle_count > 0) {
3760 jlong start_time, finish_time, timeout_left;
3761 // Before ending the process, make sure all the threads that had called
3762 // _endthreadex() completed.
3763
3764 // Set the priority level of the current thread to the same value as
3765 // the priority level of exiting threads.
3766 // This is to ensure it will be given a fair chance to execute if
3767 // the timeout expires.
3768 hthr = GetCurrentThread();
3769 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3770 start_time = os::javaTimeNanos();
3771 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3772 for (i = 0; ; ) {
3773 int portion_count = handle_count - i;
3774 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3775 portion_count = MAXIMUM_WAIT_OBJECTS;
3776 }
3777 for (j = 0; j < portion_count; ++j) {
3778 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3779 }
3780 timeout_left = (finish_time - start_time) / 1000000L;
3781 if (timeout_left < 0) {
3782 timeout_left = 0;
3783 }
3784 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3785 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3786 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3787 (res == WAIT_FAILED ? "failed" : "timed out"),
3788 GetLastError(), __FILE__, __LINE__);
3789 // Reset portion_count so we close the remaining
3790 // handles due to this error.
3791 portion_count = handle_count - i;
3792 }
3793 for (j = 0; j < portion_count; ++j) {
3794 CloseHandle(handles[i + j]);
3795 }
3796 if ((i += portion_count) >= handle_count) {
3797 break;
3798 }
3799 start_time = os::javaTimeNanos();
3800 }
3801 handle_count = 0;
3802 }
3803
3804 LeaveCriticalSection(&crit_sect);
3805 }
3806
3807 if (!registered &&
3808 OrderAccess::load_acquire(&process_exiting) != 0 &&
3809 process_exiting != GetCurrentThreadId()) {
3810 // Some other thread is about to call exit(), so we don't let
3811 // the current unregistered thread proceed to exit() or _endthreadex()
3812 while (true) {
3813 SuspendThread(GetCurrentThread());
3814 // Avoid busy-wait loop, if SuspendThread() failed.
3815 Sleep(EXIT_TIMEOUT);
3816 }
3817 }
3818 }
3819
3820 // We are here if either
3821 // - there's no 'race at exit' bug on this OS release;
3822 // - initialization of the critical section failed (unlikely);
3823 // - the current thread has registered itself and left the critical section;
3824 // - the process-exiting thread has raised the flag and left the critical section.
3825 if (what == EPT_THREAD) {
3826 _endthreadex((unsigned)exit_code);
3827 } else if (what == EPT_PROCESS) {
3828 ::exit(exit_code);
3829 } else {
3830 _exit(exit_code);
3831 }
3832
3833 // Should not reach here
3834 return exit_code;
3835 }
3836
3837 #undef EXIT_TIMEOUT
3838
3839 void os::win32::setmode_streams() {
3840 _setmode(_fileno(stdin), _O_BINARY);
3841 _setmode(_fileno(stdout), _O_BINARY);
3842 _setmode(_fileno(stderr), _O_BINARY);
3843 }
3844
3845
3846 bool os::is_debugger_attached() {
3847 return IsDebuggerPresent() ? true : false;
3848 }
3849
3850
3851 void os::wait_for_keypress_at_exit(void) {
3852 if (PauseAtExit) {
3853 fprintf(stderr, "Press any key to continue...\n");
3854 fgetc(stdin);
3855 }
3856 }
3857
3858
3859 bool os::message_box(const char* title, const char* message) {
3860 int result = MessageBox(NULL, message, title,
3861 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3862 return result == IDYES;
3863 }
3864
3865 #ifndef PRODUCT
3866 #ifndef _WIN64
3867 // Helpers to check whether NX protection is enabled
3868 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3869 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3870 pex->ExceptionRecord->NumberParameters > 0 &&
3871 pex->ExceptionRecord->ExceptionInformation[0] ==
3872 EXCEPTION_INFO_EXEC_VIOLATION) {
3873 return EXCEPTION_EXECUTE_HANDLER;
3874 }
3875 return EXCEPTION_CONTINUE_SEARCH;
3876 }
3877
3878 void nx_check_protection() {
3879 // If NX is enabled we'll get an exception calling into code on the stack
3880 char code[] = { (char)0xC3 }; // ret
3881 void *code_ptr = (void *)code;
3882 __try {
3883 __asm call code_ptr
3884 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3885 tty->print_raw_cr("NX protection detected.");
3886 }
3887 }
3888 #endif // _WIN64
3889 #endif // PRODUCT
3890
3891 // This is called _before_ the global arguments have been parsed
3892 void os::init(void) {
3893 _initial_pid = _getpid();
3894
3895 init_random(1234567);
3896
3897 win32::initialize_system_info();
3898 win32::setmode_streams();
3899 init_page_sizes((size_t) win32::vm_page_size());
3900
3901 // This may be overridden later when argument processing is done.
3902 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
3903
3904 // Initialize main_process and main_thread
3905 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3906 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3907 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3908 fatal("DuplicateHandle failed\n");
3909 }
3910 main_thread_id = (int) GetCurrentThreadId();
3911
3912 // initialize fast thread access - only used for 32-bit
3913 win32::initialize_thread_ptr_offset();
3914 }
3915
3916 // To install functions for atexit processing
3917 extern "C" {
3918 static void perfMemory_exit_helper() {
3919 perfMemory_exit();
3920 }
3921 }
3922
3923 static jint initSock();
3924
3925 // this is called _after_ the global arguments have been parsed
3926 jint os::init_2(void) {
3927 // Setup Windows Exceptions
3928
3929 // for debugging float code generation bugs
3930 if (ForceFloatExceptions) {
3931 #ifndef _WIN64
3932 static long fp_control_word = 0;
3933 __asm { fstcw fp_control_word }
3934 // see Intel PPro Manual, Vol. 2, p 7-16
3935 const long precision = 0x20;
3936 const long underflow = 0x10;
3937 const long overflow = 0x08;
3938 const long zero_div = 0x04;
3939 const long denorm = 0x02;
3940 const long invalid = 0x01;
3941 fp_control_word |= invalid;
3942 __asm { fldcw fp_control_word }
3943 #endif
3944 }
3945
3946 // If stack_commit_size is 0, windows will reserve the default size,
3947 // but only commit a small portion of it.
3948 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
3949 size_t default_reserve_size = os::win32::default_stack_size();
3950 size_t actual_reserve_size = stack_commit_size;
3951 if (stack_commit_size < default_reserve_size) {
3952 // If stack_commit_size == 0, we want this too
3953 actual_reserve_size = default_reserve_size;
3954 }
3955
3956 // Check minimum allowable stack size for thread creation and to initialize
3957 // the java system classes, including StackOverflowError - depends on page
3958 // size. Add two 4K pages for compiler2 recursion in main thread.
3959 // Add in 4*BytesPerWord 4K pages to account for VM stack during
3960 // class initialization depending on 32 or 64 bit VM.
3961 size_t min_stack_allowed =
3962 (size_t)(JavaThread::stack_guard_zone_size() +
3963 JavaThread::stack_shadow_zone_size() +
3964 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
3965
3966 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
3967
3968 if (actual_reserve_size < min_stack_allowed) {
3969 tty->print_cr("\nThe Java thread stack size specified is too small. "
3970 "Specify at least %dk",
3971 min_stack_allowed / K);
3972 return JNI_ERR;
3973 }
3974
3975 JavaThread::set_stack_size_at_create(stack_commit_size);
3976
3977 // Calculate theoretical max. size of Threads to guard gainst artifical
3978 // out-of-memory situations, where all available address-space has been
3979 // reserved by thread stacks.
3980 assert(actual_reserve_size != 0, "Must have a stack");
3981
3982 // Calculate the thread limit when we should start doing Virtual Memory
3983 // banging. Currently when the threads will have used all but 200Mb of space.
3984 //
3985 // TODO: consider performing a similar calculation for commit size instead
3986 // as reserve size, since on a 64-bit platform we'll run into that more
3987 // often than running out of virtual memory space. We can use the
3988 // lower value of the two calculations as the os_thread_limit.
3989 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3990 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3991
3992 // at exit methods are called in the reverse order of their registration.
3993 // there is no limit to the number of functions registered. atexit does
3994 // not set errno.
3995
3996 if (PerfAllowAtExitRegistration) {
3997 // only register atexit functions if PerfAllowAtExitRegistration is set.
3998 // atexit functions can be delayed until process exit time, which
3999 // can be problematic for embedded VM situations. Embedded VMs should
4000 // call DestroyJavaVM() to assure that VM resources are released.
4001
4002 // note: perfMemory_exit_helper atexit function may be removed in
4003 // the future if the appropriate cleanup code can be added to the
4004 // VM_Exit VMOperation's doit method.
4005 if (atexit(perfMemory_exit_helper) != 0) {
4006 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4007 }
4008 }
4009
4010 #ifndef _WIN64
4011 // Print something if NX is enabled (win32 on AMD64)
4012 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4013 #endif
4014
4015 // initialize thread priority policy
4016 prio_init();
4017
4018 if (UseNUMA && !ForceNUMA) {
4019 UseNUMA = false; // We don't fully support this yet
4020 }
4021
4022 if (UseNUMAInterleaving) {
4023 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4024 bool success = numa_interleaving_init();
4025 if (!success) UseNUMAInterleaving = false;
4026 }
4027
4028 if (initSock() != JNI_OK) {
4029 return JNI_ERR;
4030 }
4031
4032 SymbolEngine::recalc_search_path();
4033
4034 return JNI_OK;
4035 }
4036
4037 // Mark the polling page as unreadable
4038 void os::make_polling_page_unreadable(void) {
4039 DWORD old_status;
4040 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4041 PAGE_NOACCESS, &old_status)) {
4042 fatal("Could not disable polling page");
4043 }
4044 }
4045
4046 // Mark the polling page as readable
4047 void os::make_polling_page_readable(void) {
4048 DWORD old_status;
4049 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4050 PAGE_READONLY, &old_status)) {
4051 fatal("Could not enable polling page");
4052 }
4053 }
4054
4055
4056 int os::stat(const char *path, struct stat *sbuf) {
4057 char pathbuf[MAX_PATH];
4058 if (strlen(path) > MAX_PATH - 1) {
4059 errno = ENAMETOOLONG;
4060 return -1;
4061 }
4062 os::native_path(strcpy(pathbuf, path));
4063 int ret = ::stat(pathbuf, sbuf);
4064 if (sbuf != NULL && UseUTCFileTimestamp) {
4065 // Fix for 6539723. st_mtime returned from stat() is dependent on
4066 // the system timezone and so can return different values for the
4067 // same file if/when daylight savings time changes. This adjustment
4068 // makes sure the same timestamp is returned regardless of the TZ.
4069 //
4070 // See:
4071 // http://msdn.microsoft.com/library/
4072 // default.asp?url=/library/en-us/sysinfo/base/
4073 // time_zone_information_str.asp
4074 // and
4075 // http://msdn.microsoft.com/library/default.asp?url=
4076 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4077 //
4078 // NOTE: there is a insidious bug here: If the timezone is changed
4079 // after the call to stat() but before 'GetTimeZoneInformation()', then
4080 // the adjustment we do here will be wrong and we'll return the wrong
4081 // value (which will likely end up creating an invalid class data
4082 // archive). Absent a better API for this, or some time zone locking
4083 // mechanism, we'll have to live with this risk.
4084 TIME_ZONE_INFORMATION tz;
4085 DWORD tzid = GetTimeZoneInformation(&tz);
4086 int daylightBias =
4087 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4088 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4089 }
4090 return ret;
4091 }
4092
4093
4094 #define FT2INT64(ft) \
4095 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4096
4097
4098 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4099 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4100 // of a thread.
4101 //
4102 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4103 // the fast estimate available on the platform.
4104
4105 // current_thread_cpu_time() is not optimized for Windows yet
4106 jlong os::current_thread_cpu_time() {
4107 // return user + sys since the cost is the same
4108 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4109 }
4110
4111 jlong os::thread_cpu_time(Thread* thread) {
4112 // consistent with what current_thread_cpu_time() returns.
4113 return os::thread_cpu_time(thread, true /* user+sys */);
4114 }
4115
4116 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4117 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4118 }
4119
4120 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4121 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4122 // If this function changes, os::is_thread_cpu_time_supported() should too
4123 FILETIME CreationTime;
4124 FILETIME ExitTime;
4125 FILETIME KernelTime;
4126 FILETIME UserTime;
4127
4128 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4129 &ExitTime, &KernelTime, &UserTime) == 0) {
4130 return -1;
4131 } else if (user_sys_cpu_time) {
4132 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4133 } else {
4134 return FT2INT64(UserTime) * 100;
4135 }
4136 }
4137
4138 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4139 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4140 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4141 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4142 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4143 }
4144
4145 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4146 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4147 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4148 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4149 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4150 }
4151
4152 bool os::is_thread_cpu_time_supported() {
4153 // see os::thread_cpu_time
4154 FILETIME CreationTime;
4155 FILETIME ExitTime;
4156 FILETIME KernelTime;
4157 FILETIME UserTime;
4158
4159 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4160 &KernelTime, &UserTime) == 0) {
4161 return false;
4162 } else {
4163 return true;
4164 }
4165 }
4166
4167 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4168 // It does have primitives (PDH API) to get CPU usage and run queue length.
4169 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4170 // If we wanted to implement loadavg on Windows, we have a few options:
4171 //
4172 // a) Query CPU usage and run queue length and "fake" an answer by
4173 // returning the CPU usage if it's under 100%, and the run queue
4174 // length otherwise. It turns out that querying is pretty slow
4175 // on Windows, on the order of 200 microseconds on a fast machine.
4176 // Note that on the Windows the CPU usage value is the % usage
4177 // since the last time the API was called (and the first call
4178 // returns 100%), so we'd have to deal with that as well.
4179 //
4180 // b) Sample the "fake" answer using a sampling thread and store
4181 // the answer in a global variable. The call to loadavg would
4182 // just return the value of the global, avoiding the slow query.
4183 //
4184 // c) Sample a better answer using exponential decay to smooth the
4185 // value. This is basically the algorithm used by UNIX kernels.
4186 //
4187 // Note that sampling thread starvation could affect both (b) and (c).
4188 int os::loadavg(double loadavg[], int nelem) {
4189 return -1;
4190 }
4191
4192
4193 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4194 bool os::dont_yield() {
4195 return DontYieldALot;
4196 }
4197
4198 // This method is a slightly reworked copy of JDK's sysOpen
4199 // from src/windows/hpi/src/sys_api_md.c
4200
4201 int os::open(const char *path, int oflag, int mode) {
4202 char pathbuf[MAX_PATH];
4203
4204 if (strlen(path) > MAX_PATH - 1) {
4205 errno = ENAMETOOLONG;
4206 return -1;
4207 }
4208 os::native_path(strcpy(pathbuf, path));
4209 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4210 }
4211
4212 FILE* os::open(int fd, const char* mode) {
4213 return ::_fdopen(fd, mode);
4214 }
4215
4216 // Is a (classpath) directory empty?
4217 bool os::dir_is_empty(const char* path) {
4218 WIN32_FIND_DATA fd;
4219 HANDLE f = FindFirstFile(path, &fd);
4220 if (f == INVALID_HANDLE_VALUE) {
4221 return true;
4222 }
4223 FindClose(f);
4224 return false;
4225 }
4226
4227 // create binary file, rewriting existing file if required
4228 int os::create_binary_file(const char* path, bool rewrite_existing) {
4229 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4230 if (!rewrite_existing) {
4231 oflags |= _O_EXCL;
4232 }
4233 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4234 }
4235
4236 // return current position of file pointer
4237 jlong os::current_file_offset(int fd) {
4238 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4239 }
4240
4241 // move file pointer to the specified offset
4242 jlong os::seek_to_file_offset(int fd, jlong offset) {
4243 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4244 }
4245
4246
4247 jlong os::lseek(int fd, jlong offset, int whence) {
4248 return (jlong) ::_lseeki64(fd, offset, whence);
4249 }
4250
4251 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4252 OVERLAPPED ov;
4253 DWORD nread;
4254 BOOL result;
4255
4256 ZeroMemory(&ov, sizeof(ov));
4257 ov.Offset = (DWORD)offset;
4258 ov.OffsetHigh = (DWORD)(offset >> 32);
4259
4260 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4261
4262 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4263
4264 return result ? nread : 0;
4265 }
4266
4267
4268 // This method is a slightly reworked copy of JDK's sysNativePath
4269 // from src/windows/hpi/src/path_md.c
4270
4271 // Convert a pathname to native format. On win32, this involves forcing all
4272 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4273 // sometimes rejects '/') and removing redundant separators. The input path is
4274 // assumed to have been converted into the character encoding used by the local
4275 // system. Because this might be a double-byte encoding, care is taken to
4276 // treat double-byte lead characters correctly.
4277 //
4278 // This procedure modifies the given path in place, as the result is never
4279 // longer than the original. There is no error return; this operation always
4280 // succeeds.
4281 char * os::native_path(char *path) {
4282 char *src = path, *dst = path, *end = path;
4283 char *colon = NULL; // If a drive specifier is found, this will
4284 // point to the colon following the drive letter
4285
4286 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4287 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4288 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4289
4290 // Check for leading separators
4291 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4292 while (isfilesep(*src)) {
4293 src++;
4294 }
4295
4296 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4297 // Remove leading separators if followed by drive specifier. This
4298 // hack is necessary to support file URLs containing drive
4299 // specifiers (e.g., "file://c:/path"). As a side effect,
4300 // "/c:/path" can be used as an alternative to "c:/path".
4301 *dst++ = *src++;
4302 colon = dst;
4303 *dst++ = ':';
4304 src++;
4305 } else {
4306 src = path;
4307 if (isfilesep(src[0]) && isfilesep(src[1])) {
4308 // UNC pathname: Retain first separator; leave src pointed at
4309 // second separator so that further separators will be collapsed
4310 // into the second separator. The result will be a pathname
4311 // beginning with "\\\\" followed (most likely) by a host name.
4312 src = dst = path + 1;
4313 path[0] = '\\'; // Force first separator to '\\'
4314 }
4315 }
4316
4317 end = dst;
4318
4319 // Remove redundant separators from remainder of path, forcing all
4320 // separators to be '\\' rather than '/'. Also, single byte space
4321 // characters are removed from the end of the path because those
4322 // are not legal ending characters on this operating system.
4323 //
4324 while (*src != '\0') {
4325 if (isfilesep(*src)) {
4326 *dst++ = '\\'; src++;
4327 while (isfilesep(*src)) src++;
4328 if (*src == '\0') {
4329 // Check for trailing separator
4330 end = dst;
4331 if (colon == dst - 2) break; // "z:\\"
4332 if (dst == path + 1) break; // "\\"
4333 if (dst == path + 2 && isfilesep(path[0])) {
4334 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4335 // beginning of a UNC pathname. Even though it is not, by
4336 // itself, a valid UNC pathname, we leave it as is in order
4337 // to be consistent with the path canonicalizer as well
4338 // as the win32 APIs, which treat this case as an invalid
4339 // UNC pathname rather than as an alias for the root
4340 // directory of the current drive.
4341 break;
4342 }
4343 end = --dst; // Path does not denote a root directory, so
4344 // remove trailing separator
4345 break;
4346 }
4347 end = dst;
4348 } else {
4349 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4350 *dst++ = *src++;
4351 if (*src) *dst++ = *src++;
4352 end = dst;
4353 } else { // Copy a single-byte character
4354 char c = *src++;
4355 *dst++ = c;
4356 // Space is not a legal ending character
4357 if (c != ' ') end = dst;
4358 }
4359 }
4360 }
4361
4362 *end = '\0';
4363
4364 // For "z:", add "." to work around a bug in the C runtime library
4365 if (colon == dst - 1) {
4366 path[2] = '.';
4367 path[3] = '\0';
4368 }
4369
4370 return path;
4371 }
4372
4373 // This code is a copy of JDK's sysSetLength
4374 // from src/windows/hpi/src/sys_api_md.c
4375
4376 int os::ftruncate(int fd, jlong length) {
4377 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4378 long high = (long)(length >> 32);
4379 DWORD ret;
4380
4381 if (h == (HANDLE)(-1)) {
4382 return -1;
4383 }
4384
4385 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4386 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4387 return -1;
4388 }
4389
4390 if (::SetEndOfFile(h) == FALSE) {
4391 return -1;
4392 }
4393
4394 return 0;
4395 }
4396
4397 int os::get_fileno(FILE* fp) {
4398 return _fileno(fp);
4399 }
4400
4401 // This code is a copy of JDK's sysSync
4402 // from src/windows/hpi/src/sys_api_md.c
4403 // except for the legacy workaround for a bug in Win 98
4404
4405 int os::fsync(int fd) {
4406 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4407
4408 if ((!::FlushFileBuffers(handle)) &&
4409 (GetLastError() != ERROR_ACCESS_DENIED)) {
4410 // from winerror.h
4411 return -1;
4412 }
4413 return 0;
4414 }
4415
4416 static int nonSeekAvailable(int, long *);
4417 static int stdinAvailable(int, long *);
4418
4419 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4420 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4421
4422 // This code is a copy of JDK's sysAvailable
4423 // from src/windows/hpi/src/sys_api_md.c
4424
4425 int os::available(int fd, jlong *bytes) {
4426 jlong cur, end;
4427 struct _stati64 stbuf64;
4428
4429 if (::_fstati64(fd, &stbuf64) >= 0) {
4430 int mode = stbuf64.st_mode;
4431 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4432 int ret;
4433 long lpbytes;
4434 if (fd == 0) {
4435 ret = stdinAvailable(fd, &lpbytes);
4436 } else {
4437 ret = nonSeekAvailable(fd, &lpbytes);
4438 }
4439 (*bytes) = (jlong)(lpbytes);
4440 return ret;
4441 }
4442 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4443 return FALSE;
4444 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4445 return FALSE;
4446 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4447 return FALSE;
4448 }
4449 *bytes = end - cur;
4450 return TRUE;
4451 } else {
4452 return FALSE;
4453 }
4454 }
4455
4456 void os::flockfile(FILE* fp) {
4457 _lock_file(fp);
4458 }
4459
4460 void os::funlockfile(FILE* fp) {
4461 _unlock_file(fp);
4462 }
4463
4464 // This code is a copy of JDK's nonSeekAvailable
4465 // from src/windows/hpi/src/sys_api_md.c
4466
4467 static int nonSeekAvailable(int fd, long *pbytes) {
4468 // This is used for available on non-seekable devices
4469 // (like both named and anonymous pipes, such as pipes
4470 // connected to an exec'd process).
4471 // Standard Input is a special case.
4472 HANDLE han;
4473
4474 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4475 return FALSE;
4476 }
4477
4478 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4479 // PeekNamedPipe fails when at EOF. In that case we
4480 // simply make *pbytes = 0 which is consistent with the
4481 // behavior we get on Solaris when an fd is at EOF.
4482 // The only alternative is to raise an Exception,
4483 // which isn't really warranted.
4484 //
4485 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4486 return FALSE;
4487 }
4488 *pbytes = 0;
4489 }
4490 return TRUE;
4491 }
4492
4493 #define MAX_INPUT_EVENTS 2000
4494
4495 // This code is a copy of JDK's stdinAvailable
4496 // from src/windows/hpi/src/sys_api_md.c
4497
4498 static int stdinAvailable(int fd, long *pbytes) {
4499 HANDLE han;
4500 DWORD numEventsRead = 0; // Number of events read from buffer
4501 DWORD numEvents = 0; // Number of events in buffer
4502 DWORD i = 0; // Loop index
4503 DWORD curLength = 0; // Position marker
4504 DWORD actualLength = 0; // Number of bytes readable
4505 BOOL error = FALSE; // Error holder
4506 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4507
4508 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4509 return FALSE;
4510 }
4511
4512 // Construct an array of input records in the console buffer
4513 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4514 if (error == 0) {
4515 return nonSeekAvailable(fd, pbytes);
4516 }
4517
4518 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4519 if (numEvents > MAX_INPUT_EVENTS) {
4520 numEvents = MAX_INPUT_EVENTS;
4521 }
4522
4523 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4524 if (lpBuffer == NULL) {
4525 return FALSE;
4526 }
4527
4528 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4529 if (error == 0) {
4530 os::free(lpBuffer);
4531 return FALSE;
4532 }
4533
4534 // Examine input records for the number of bytes available
4535 for (i=0; i<numEvents; i++) {
4536 if (lpBuffer[i].EventType == KEY_EVENT) {
4537
4538 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4539 &(lpBuffer[i].Event);
4540 if (keyRecord->bKeyDown == TRUE) {
4541 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4542 curLength++;
4543 if (*keyPressed == '\r') {
4544 actualLength = curLength;
4545 }
4546 }
4547 }
4548 }
4549
4550 if (lpBuffer != NULL) {
4551 os::free(lpBuffer);
4552 }
4553
4554 *pbytes = (long) actualLength;
4555 return TRUE;
4556 }
4557
4558 // Map a block of memory.
4559 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4560 char *addr, size_t bytes, bool read_only,
4561 bool allow_exec) {
4562 HANDLE hFile;
4563 char* base;
4564
4565 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4566 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4567 if (hFile == NULL) {
4568 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4569 return NULL;
4570 }
4571
4572 if (allow_exec) {
4573 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4574 // unless it comes from a PE image (which the shared archive is not.)
4575 // Even VirtualProtect refuses to give execute access to mapped memory
4576 // that was not previously executable.
4577 //
4578 // Instead, stick the executable region in anonymous memory. Yuck.
4579 // Penalty is that ~4 pages will not be shareable - in the future
4580 // we might consider DLLizing the shared archive with a proper PE
4581 // header so that mapping executable + sharing is possible.
4582
4583 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4584 PAGE_READWRITE);
4585 if (base == NULL) {
4586 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4587 CloseHandle(hFile);
4588 return NULL;
4589 }
4590
4591 DWORD bytes_read;
4592 OVERLAPPED overlapped;
4593 overlapped.Offset = (DWORD)file_offset;
4594 overlapped.OffsetHigh = 0;
4595 overlapped.hEvent = NULL;
4596 // ReadFile guarantees that if the return value is true, the requested
4597 // number of bytes were read before returning.
4598 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4599 if (!res) {
4600 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4601 release_memory(base, bytes);
4602 CloseHandle(hFile);
4603 return NULL;
4604 }
4605 } else {
4606 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4607 NULL /* file_name */);
4608 if (hMap == NULL) {
4609 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4610 CloseHandle(hFile);
4611 return NULL;
4612 }
4613
4614 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4615 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4616 (DWORD)bytes, addr);
4617 if (base == NULL) {
4618 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4619 CloseHandle(hMap);
4620 CloseHandle(hFile);
4621 return NULL;
4622 }
4623
4624 if (CloseHandle(hMap) == 0) {
4625 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4626 CloseHandle(hFile);
4627 return base;
4628 }
4629 }
4630
4631 if (allow_exec) {
4632 DWORD old_protect;
4633 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4634 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4635
4636 if (!res) {
4637 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4638 // Don't consider this a hard error, on IA32 even if the
4639 // VirtualProtect fails, we should still be able to execute
4640 CloseHandle(hFile);
4641 return base;
4642 }
4643 }
4644
4645 if (CloseHandle(hFile) == 0) {
4646 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4647 return base;
4648 }
4649
4650 return base;
4651 }
4652
4653
4654 // Remap a block of memory.
4655 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4656 char *addr, size_t bytes, bool read_only,
4657 bool allow_exec) {
4658 // This OS does not allow existing memory maps to be remapped so we
4659 // have to unmap the memory before we remap it.
4660 if (!os::unmap_memory(addr, bytes)) {
4661 return NULL;
4662 }
4663
4664 // There is a very small theoretical window between the unmap_memory()
4665 // call above and the map_memory() call below where a thread in native
4666 // code may be able to access an address that is no longer mapped.
4667
4668 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4669 read_only, allow_exec);
4670 }
4671
4672
4673 // Unmap a block of memory.
4674 // Returns true=success, otherwise false.
4675
4676 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4677 MEMORY_BASIC_INFORMATION mem_info;
4678 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4679 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4680 return false;
4681 }
4682
4683 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4684 // Instead, executable region was allocated using VirtualAlloc(). See
4685 // pd_map_memory() above.
4686 //
4687 // The following flags should match the 'exec_access' flages used for
4688 // VirtualProtect() in pd_map_memory().
4689 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4690 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4691 return pd_release_memory(addr, bytes);
4692 }
4693
4694 BOOL result = UnmapViewOfFile(addr);
4695 if (result == 0) {
4696 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4697 return false;
4698 }
4699 return true;
4700 }
4701
4702 void os::pause() {
4703 char filename[MAX_PATH];
4704 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4705 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4706 } else {
4707 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4708 }
4709
4710 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4711 if (fd != -1) {
4712 struct stat buf;
4713 ::close(fd);
4714 while (::stat(filename, &buf) == 0) {
4715 Sleep(100);
4716 }
4717 } else {
4718 jio_fprintf(stderr,
4719 "Could not open pause file '%s', continuing immediately.\n", filename);
4720 }
4721 }
4722
4723 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
4724 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
4725 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
4726
4727 os::ThreadCrashProtection::ThreadCrashProtection() {
4728 }
4729
4730 // See the caveats for this class in os_windows.hpp
4731 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4732 // into this method and returns false. If no OS EXCEPTION was raised, returns
4733 // true.
4734 // The callback is supposed to provide the method that should be protected.
4735 //
4736 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4737
4738 Thread::muxAcquire(&_crash_mux, "CrashProtection");
4739
4740 _protected_thread = Thread::current_or_null();
4741 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
4742
4743 bool success = true;
4744 __try {
4745 _crash_protection = this;
4746 cb.call();
4747 } __except(EXCEPTION_EXECUTE_HANDLER) {
4748 // only for protection, nothing to do
4749 success = false;
4750 }
4751 _crash_protection = NULL;
4752 _protected_thread = NULL;
4753 Thread::muxRelease(&_crash_mux);
4754 return success;
4755 }
4756
4757 // An Event wraps a win32 "CreateEvent" kernel handle.
4758 //
4759 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4760 //
4761 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4762 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4763 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4764 // In addition, an unpark() operation might fetch the handle field, but the
4765 // event could recycle between the fetch and the SetEvent() operation.
4766 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4767 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4768 // on an stale but recycled handle would be harmless, but in practice this might
4769 // confuse other non-Sun code, so it's not a viable approach.
4770 //
4771 // 2: Once a win32 event handle is associated with an Event, it remains associated
4772 // with the Event. The event handle is never closed. This could be construed
4773 // as handle leakage, but only up to the maximum # of threads that have been extant
4774 // at any one time. This shouldn't be an issue, as windows platforms typically
4775 // permit a process to have hundreds of thousands of open handles.
4776 //
4777 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4778 // and release unused handles.
4779 //
4780 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4781 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4782 //
4783 // 5. Use an RCU-like mechanism (Read-Copy Update).
4784 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4785 //
4786 // We use (2).
4787 //
4788 // TODO-FIXME:
4789 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4790 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4791 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4792 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4793 // into a single win32 CreateEvent() handle.
4794 //
4795 // Assumption:
4796 // Only one parker can exist on an event, which is why we allocate
4797 // them per-thread. Multiple unparkers can coexist.
4798 //
4799 // _Event transitions in park()
4800 // -1 => -1 : illegal
4801 // 1 => 0 : pass - return immediately
4802 // 0 => -1 : block; then set _Event to 0 before returning
4803 //
4804 // _Event transitions in unpark()
4805 // 0 => 1 : just return
4806 // 1 => 1 : just return
4807 // -1 => either 0 or 1; must signal target thread
4808 // That is, we can safely transition _Event from -1 to either
4809 // 0 or 1.
4810 //
4811 // _Event serves as a restricted-range semaphore.
4812 // -1 : thread is blocked, i.e. there is a waiter
4813 // 0 : neutral: thread is running or ready,
4814 // could have been signaled after a wait started
4815 // 1 : signaled - thread is running or ready
4816 //
4817 // Another possible encoding of _Event would be with
4818 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4819 //
4820
4821 int os::PlatformEvent::park(jlong Millis) {
4822 // Transitions for _Event:
4823 // -1 => -1 : illegal
4824 // 1 => 0 : pass - return immediately
4825 // 0 => -1 : block; then set _Event to 0 before returning
4826
4827 guarantee(_ParkHandle != NULL , "Invariant");
4828 guarantee(Millis > 0 , "Invariant");
4829
4830 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4831 // the initial park() operation.
4832 // Consider: use atomic decrement instead of CAS-loop
4833
4834 int v;
4835 for (;;) {
4836 v = _Event;
4837 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4838 }
4839 guarantee((v == 0) || (v == 1), "invariant");
4840 if (v != 0) return OS_OK;
4841
4842 // Do this the hard way by blocking ...
4843 // TODO: consider a brief spin here, gated on the success of recent
4844 // spin attempts by this thread.
4845 //
4846 // We decompose long timeouts into series of shorter timed waits.
4847 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4848 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4849 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4850 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4851 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4852 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4853 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4854 // for the already waited time. This policy does not admit any new outcomes.
4855 // In the future, however, we might want to track the accumulated wait time and
4856 // adjust Millis accordingly if we encounter a spurious wakeup.
4857
4858 const int MAXTIMEOUT = 0x10000000;
4859 DWORD rv = WAIT_TIMEOUT;
4860 while (_Event < 0 && Millis > 0) {
4861 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
4862 if (Millis > MAXTIMEOUT) {
4863 prd = MAXTIMEOUT;
4864 }
4865 rv = ::WaitForSingleObject(_ParkHandle, prd);
4866 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
4867 if (rv == WAIT_TIMEOUT) {
4868 Millis -= prd;
4869 }
4870 }
4871 v = _Event;
4872 _Event = 0;
4873 // see comment at end of os::PlatformEvent::park() below:
4874 OrderAccess::fence();
4875 // If we encounter a nearly simultanous timeout expiry and unpark()
4876 // we return OS_OK indicating we awoke via unpark().
4877 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4878 return (v >= 0) ? OS_OK : OS_TIMEOUT;
4879 }
4880
4881 void os::PlatformEvent::park() {
4882 // Transitions for _Event:
4883 // -1 => -1 : illegal
4884 // 1 => 0 : pass - return immediately
4885 // 0 => -1 : block; then set _Event to 0 before returning
4886
4887 guarantee(_ParkHandle != NULL, "Invariant");
4888 // Invariant: Only the thread associated with the Event/PlatformEvent
4889 // may call park().
4890 // Consider: use atomic decrement instead of CAS-loop
4891 int v;
4892 for (;;) {
4893 v = _Event;
4894 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4895 }
4896 guarantee((v == 0) || (v == 1), "invariant");
4897 if (v != 0) return;
4898
4899 // Do this the hard way by blocking ...
4900 // TODO: consider a brief spin here, gated on the success of recent
4901 // spin attempts by this thread.
4902 while (_Event < 0) {
4903 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
4904 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
4905 }
4906
4907 // Usually we'll find _Event == 0 at this point, but as
4908 // an optional optimization we clear it, just in case can
4909 // multiple unpark() operations drove _Event up to 1.
4910 _Event = 0;
4911 OrderAccess::fence();
4912 guarantee(_Event >= 0, "invariant");
4913 }
4914
4915 void os::PlatformEvent::unpark() {
4916 guarantee(_ParkHandle != NULL, "Invariant");
4917
4918 // Transitions for _Event:
4919 // 0 => 1 : just return
4920 // 1 => 1 : just return
4921 // -1 => either 0 or 1; must signal target thread
4922 // That is, we can safely transition _Event from -1 to either
4923 // 0 or 1.
4924 // See also: "Semaphores in Plan 9" by Mullender & Cox
4925 //
4926 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4927 // that it will take two back-to-back park() calls for the owning
4928 // thread to block. This has the benefit of forcing a spurious return
4929 // from the first park() call after an unpark() call which will help
4930 // shake out uses of park() and unpark() without condition variables.
4931
4932 if (Atomic::xchg(1, &_Event) >= 0) return;
4933
4934 ::SetEvent(_ParkHandle);
4935 }
4936
4937
4938 // JSR166
4939 // -------------------------------------------------------
4940
4941 // The Windows implementation of Park is very straightforward: Basic
4942 // operations on Win32 Events turn out to have the right semantics to
4943 // use them directly. We opportunistically resuse the event inherited
4944 // from Monitor.
4945
4946 void Parker::park(bool isAbsolute, jlong time) {
4947 guarantee(_ParkEvent != NULL, "invariant");
4948 // First, demultiplex/decode time arguments
4949 if (time < 0) { // don't wait
4950 return;
4951 } else if (time == 0 && !isAbsolute) {
4952 time = INFINITE;
4953 } else if (isAbsolute) {
4954 time -= os::javaTimeMillis(); // convert to relative time
4955 if (time <= 0) { // already elapsed
4956 return;
4957 }
4958 } else { // relative
4959 time /= 1000000; // Must coarsen from nanos to millis
4960 if (time == 0) { // Wait for the minimal time unit if zero
4961 time = 1;
4962 }
4963 }
4964
4965 JavaThread* thread = JavaThread::current();
4966
4967 // Don't wait if interrupted or already triggered
4968 if (Thread::is_interrupted(thread, false) ||
4969 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4970 ResetEvent(_ParkEvent);
4971 return;
4972 } else {
4973 ThreadBlockInVM tbivm(thread);
4974 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4975 thread->set_suspend_equivalent();
4976
4977 WaitForSingleObject(_ParkEvent, time);
4978 ResetEvent(_ParkEvent);
4979
4980 // If externally suspended while waiting, re-suspend
4981 if (thread->handle_special_suspend_equivalent_condition()) {
4982 thread->java_suspend_self();
4983 }
4984 }
4985 }
4986
4987 void Parker::unpark() {
4988 guarantee(_ParkEvent != NULL, "invariant");
4989 SetEvent(_ParkEvent);
4990 }
4991
4992 // Run the specified command in a separate process. Return its exit value,
4993 // or -1 on failure (e.g. can't create a new process).
4994 int os::fork_and_exec(char* cmd) {
4995 STARTUPINFO si;
4996 PROCESS_INFORMATION pi;
4997 DWORD exit_code;
4998
4999 char * cmd_string;
5000 char * cmd_prefix = "cmd /C ";
5001 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5002 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5003 if (cmd_string == NULL) {
5004 return -1;
5005 }
5006 cmd_string[0] = '\0';
5007 strcat(cmd_string, cmd_prefix);
5008 strcat(cmd_string, cmd);
5009
5010 // now replace all '\n' with '&'
5011 char * substring = cmd_string;
5012 while ((substring = strchr(substring, '\n')) != NULL) {
5013 substring[0] = '&';
5014 substring++;
5015 }
5016 memset(&si, 0, sizeof(si));
5017 si.cb = sizeof(si);
5018 memset(&pi, 0, sizeof(pi));
5019 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5020 cmd_string, // command line
5021 NULL, // process security attribute
5022 NULL, // thread security attribute
5023 TRUE, // inherits system handles
5024 0, // no creation flags
5025 NULL, // use parent's environment block
5026 NULL, // use parent's starting directory
5027 &si, // (in) startup information
5028 &pi); // (out) process information
5029
5030 if (rslt) {
5031 // Wait until child process exits.
5032 WaitForSingleObject(pi.hProcess, INFINITE);
5033
5034 GetExitCodeProcess(pi.hProcess, &exit_code);
5035
5036 // Close process and thread handles.
5037 CloseHandle(pi.hProcess);
5038 CloseHandle(pi.hThread);
5039 } else {
5040 exit_code = -1;
5041 }
5042
5043 FREE_C_HEAP_ARRAY(char, cmd_string);
5044 return (int)exit_code;
5045 }
5046
5047 bool os::find(address addr, outputStream* st) {
5048 int offset = -1;
5049 bool result = false;
5050 char buf[256];
5051 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5052 st->print(PTR_FORMAT " ", addr);
5053 if (strlen(buf) < sizeof(buf) - 1) {
5054 char* p = strrchr(buf, '\\');
5055 if (p) {
5056 st->print("%s", p + 1);
5057 } else {
5058 st->print("%s", buf);
5059 }
5060 } else {
5061 // The library name is probably truncated. Let's omit the library name.
5062 // See also JDK-8147512.
5063 }
5064 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5065 st->print("::%s + 0x%x", buf, offset);
5066 }
5067 st->cr();
5068 result = true;
5069 }
5070 return result;
5071 }
5072
5073 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5074 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5075
5076 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5077 JavaThread* thread = JavaThread::current();
5078 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5079 address addr = (address) exceptionRecord->ExceptionInformation[1];
5080
5081 if (os::is_memory_serialize_page(thread, addr)) {
5082 return EXCEPTION_CONTINUE_EXECUTION;
5083 }
5084 }
5085
5086 return EXCEPTION_CONTINUE_SEARCH;
5087 }
5088
5089 // We don't build a headless jre for Windows
5090 bool os::is_headless_jre() { return false; }
5091
5092 static jint initSock() {
5093 WSADATA wsadata;
5094
5095 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5096 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5097 ::GetLastError());
5098 return JNI_ERR;
5099 }
5100 return JNI_OK;
5101 }
5102
5103 struct hostent* os::get_host_by_name(char* name) {
5104 return (struct hostent*)gethostbyname(name);
5105 }
5106
5107 int os::socket_close(int fd) {
5108 return ::closesocket(fd);
5109 }
5110
5111 int os::socket(int domain, int type, int protocol) {
5112 return ::socket(domain, type, protocol);
5113 }
5114
5115 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5116 return ::connect(fd, him, len);
5117 }
5118
5119 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5120 return ::recv(fd, buf, (int)nBytes, flags);
5121 }
5122
5123 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5124 return ::send(fd, buf, (int)nBytes, flags);
5125 }
5126
5127 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5128 return ::send(fd, buf, (int)nBytes, flags);
5129 }
5130
5131 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5132 #if defined(IA32)
5133 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5134 #elif defined (AMD64)
5135 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5136 #endif
5137
5138 // returns true if thread could be suspended,
5139 // false otherwise
5140 static bool do_suspend(HANDLE* h) {
5141 if (h != NULL) {
5142 if (SuspendThread(*h) != ~0) {
5143 return true;
5144 }
5145 }
5146 return false;
5147 }
5148
5149 // resume the thread
5150 // calling resume on an active thread is a no-op
5151 static void do_resume(HANDLE* h) {
5152 if (h != NULL) {
5153 ResumeThread(*h);
5154 }
5155 }
5156
5157 // retrieve a suspend/resume context capable handle
5158 // from the tid. Caller validates handle return value.
5159 void get_thread_handle_for_extended_context(HANDLE* h,
5160 OSThread::thread_id_t tid) {
5161 if (h != NULL) {
5162 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5163 }
5164 }
5165
5166 // Thread sampling implementation
5167 //
5168 void os::SuspendedThreadTask::internal_do_task() {
5169 CONTEXT ctxt;
5170 HANDLE h = NULL;
5171
5172 // get context capable handle for thread
5173 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5174
5175 // sanity
5176 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5177 return;
5178 }
5179
5180 // suspend the thread
5181 if (do_suspend(&h)) {
5182 ctxt.ContextFlags = sampling_context_flags;
5183 // get thread context
5184 GetThreadContext(h, &ctxt);
5185 SuspendedThreadTaskContext context(_thread, &ctxt);
5186 // pass context to Thread Sampling impl
5187 do_task(context);
5188 // resume thread
5189 do_resume(&h);
5190 }
5191
5192 // close handle
5193 CloseHandle(h);
5194 }
5195
5196 bool os::start_debugging(char *buf, int buflen) {
5197 int len = (int)strlen(buf);
5198 char *p = &buf[len];
5199
5200 jio_snprintf(p, buflen-len,
5201 "\n\n"
5202 "Do you want to debug the problem?\n\n"
5203 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5204 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5205 "Otherwise, select 'No' to abort...",
5206 os::current_process_id(), os::current_thread_id());
5207
5208 bool yes = os::message_box("Unexpected Error", buf);
5209
5210 if (yes) {
5211 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5212 // exception. If VM is running inside a debugger, the debugger will
5213 // catch the exception. Otherwise, the breakpoint exception will reach
5214 // the default windows exception handler, which can spawn a debugger and
5215 // automatically attach to the dying VM.
5216 os::breakpoint();
5217 yes = false;
5218 }
5219 return yes;
5220 }
5221
5222 void* os::get_default_process_handle() {
5223 return (void*)GetModuleHandle(NULL);
5224 }
5225
5226 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5227 // which is used to find statically linked in agents.
5228 // Additionally for windows, takes into account __stdcall names.
5229 // Parameters:
5230 // sym_name: Symbol in library we are looking for
5231 // lib_name: Name of library to look in, NULL for shared libs.
5232 // is_absolute_path == true if lib_name is absolute path to agent
5233 // such as "C:/a/b/L.dll"
5234 // == false if only the base name of the library is passed in
5235 // such as "L"
5236 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5237 bool is_absolute_path) {
5238 char *agent_entry_name;
5239 size_t len;
5240 size_t name_len;
5241 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5242 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5243 const char *start;
5244
5245 if (lib_name != NULL) {
5246 len = name_len = strlen(lib_name);
5247 if (is_absolute_path) {
5248 // Need to strip path, prefix and suffix
5249 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5250 lib_name = ++start;
5251 } else {
5252 // Need to check for drive prefix
5253 if ((start = strchr(lib_name, ':')) != NULL) {
5254 lib_name = ++start;
5255 }
5256 }
5257 if (len <= (prefix_len + suffix_len)) {
5258 return NULL;
5259 }
5260 lib_name += prefix_len;
5261 name_len = strlen(lib_name) - suffix_len;
5262 }
5263 }
5264 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5265 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5266 if (agent_entry_name == NULL) {
5267 return NULL;
5268 }
5269 if (lib_name != NULL) {
5270 const char *p = strrchr(sym_name, '@');
5271 if (p != NULL && p != sym_name) {
5272 // sym_name == _Agent_OnLoad@XX
5273 strncpy(agent_entry_name, sym_name, (p - sym_name));
5274 agent_entry_name[(p-sym_name)] = '\0';
5275 // agent_entry_name == _Agent_OnLoad
5276 strcat(agent_entry_name, "_");
5277 strncat(agent_entry_name, lib_name, name_len);
5278 strcat(agent_entry_name, p);
5279 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5280 } else {
5281 strcpy(agent_entry_name, sym_name);
5282 strcat(agent_entry_name, "_");
5283 strncat(agent_entry_name, lib_name, name_len);
5284 }
5285 } else {
5286 strcpy(agent_entry_name, sym_name);
5287 }
5288 return agent_entry_name;
5289 }
5290
5291 #ifndef PRODUCT
5292
5293 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5294 // contiguous memory block at a particular address.
5295 // The test first tries to find a good approximate address to allocate at by using the same
5296 // method to allocate some memory at any address. The test then tries to allocate memory in
5297 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5298 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5299 // the previously allocated memory is available for allocation. The only actual failure
5300 // that is reported is when the test tries to allocate at a particular location but gets a
5301 // different valid one. A NULL return value at this point is not considered an error but may
5302 // be legitimate.
5303 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5304 void TestReserveMemorySpecial_test() {
5305 if (!UseLargePages) {
5306 if (VerboseInternalVMTests) {
5307 tty->print("Skipping test because large pages are disabled");
5308 }
5309 return;
5310 }
5311 // save current value of globals
5312 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5313 bool old_use_numa_interleaving = UseNUMAInterleaving;
5314
5315 // set globals to make sure we hit the correct code path
5316 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5317
5318 // do an allocation at an address selected by the OS to get a good one.
5319 const size_t large_allocation_size = os::large_page_size() * 4;
5320 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5321 if (result == NULL) {
5322 if (VerboseInternalVMTests) {
5323 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5324 large_allocation_size);
5325 }
5326 } else {
5327 os::release_memory_special(result, large_allocation_size);
5328
5329 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5330 // we managed to get it once.
5331 const size_t expected_allocation_size = os::large_page_size();
5332 char* expected_location = result + os::large_page_size();
5333 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5334 if (actual_location == NULL) {
5335 if (VerboseInternalVMTests) {
5336 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5337 expected_location, large_allocation_size);
5338 }
5339 } else {
5340 // release memory
5341 os::release_memory_special(actual_location, expected_allocation_size);
5342 // only now check, after releasing any memory to avoid any leaks.
5343 assert(actual_location == expected_location,
5344 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5345 expected_location, expected_allocation_size, actual_location);
5346 }
5347 }
5348
5349 // restore globals
5350 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5351 UseNUMAInterleaving = old_use_numa_interleaving;
5352 }
5353 #endif // PRODUCT
5354
5355 /*
5356 All the defined signal names for Windows.
5357
5358 NOTE that not all of these names are accepted by FindSignal!
5359
5360 For various reasons some of these may be rejected at runtime.
5361
5362 Here are the names currently accepted by a user of sun.misc.Signal with
5363 1.4.1 (ignoring potential interaction with use of chaining, etc):
5364
5365 (LIST TBD)
5366
5367 */
5368 int os::get_signal_number(const char* name) {
5369 static const struct {
5370 char* name;
5371 int number;
5372 } siglabels [] =
5373 // derived from version 6.0 VC98/include/signal.h
5374 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5375 "FPE", SIGFPE, // floating point exception
5376 "SEGV", SIGSEGV, // segment violation
5377 "INT", SIGINT, // interrupt
5378 "TERM", SIGTERM, // software term signal from kill
5379 "BREAK", SIGBREAK, // Ctrl-Break sequence
5380 "ILL", SIGILL}; // illegal instruction
5381 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5382 if (strcmp(name, siglabels[i].name) == 0) {
5383 return siglabels[i].number;
5384 }
5385 }
5386 return -1;
5387 }
5388
5389 // Fast current thread access
5390
5391 int os::win32::_thread_ptr_offset = 0;
5392
5393 static void call_wrapper_dummy() {}
5394
5395 // We need to call the os_exception_wrapper once so that it sets
5396 // up the offset from FS of the thread pointer.
5397 void os::win32::initialize_thread_ptr_offset() {
5398 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5399 NULL, NULL, NULL, NULL);
5400 }