1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
231 }
232
233 // library_path
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 // Win32 library search order (See the documentation for LoadLibrary):
239 //
240 // 1. The directory from which application is loaded.
241 // 2. The system wide Java Extensions directory (Java only)
242 // 3. System directory (GetSystemDirectory)
243 // 4. Windows directory (GetWindowsDirectory)
244 // 5. The PATH environment variable
245 // 6. The current directory
246
247 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
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
357 #ifdef _M_IA64
358 // IA64 has memory and register stacks
359 //
360 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
361 // at thread creation (1MB backing store growing upwards, 1MB memory stack
362 // growing downwards, 2MB summed up)
363 //
364 // ...
365 // ------- top of stack (high address) -----
366 // |
367 // | 1MB
368 // | Backing Store (Register Stack)
369 // |
370 // | / \
371 // | |
372 // | |
373 // | |
374 // ------------------------ stack base -----
375 // | 1MB
376 // | Memory Stack
377 // |
378 // | |
379 // | |
380 // | |
381 // | \ /
382 // |
383 // ----- bottom of stack (low address) -----
384 // ...
385
386 stack_size = stack_size / 2;
387 #endif
388 return stack_bottom + stack_size;
389 }
390
391 size_t os::current_stack_size() {
392 size_t sz;
393 MEMORY_BASIC_INFORMATION minfo;
394 VirtualQuery(&minfo, &minfo, sizeof(minfo));
395 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
396 return sz;
397 }
398
399 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
400 const struct tm* time_struct_ptr = localtime(clock);
401 if (time_struct_ptr != NULL) {
402 *res = *time_struct_ptr;
403 return res;
404 }
405 return NULL;
406 }
407
408 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
409
410 // Thread start routine for all new Java threads
411 static unsigned __stdcall java_start(Thread* thread) {
412 // Try to randomize the cache line index of hot stack frames.
413 // This helps when threads of the same stack traces evict each other's
414 // cache lines. The threads can be either from the same JVM instance, or
415 // from different JVM instances. The benefit is especially true for
416 // processors with hyperthreading technology.
417 static int counter = 0;
418 int pid = os::current_process_id();
419 _alloca(((pid ^ counter++) & 7) * 128);
420
421 thread->initialize_thread_current();
422
423 OSThread* osthr = thread->osthread();
424 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
425
426 if (UseNUMA) {
427 int lgrp_id = os::numa_get_group_id();
428 if (lgrp_id != -1) {
429 thread->set_lgrp_id(lgrp_id);
430 }
431 }
432
433 // Diagnostic code to investigate JDK-6573254
434 int res = 30115; // non-java thread
435 if (thread->is_Java_thread()) {
436 res = 20115; // java thread
437 }
438
439 // Install a win32 structured exception handler around every thread created
440 // by VM, so VM can generate error dump when an exception occurred in non-
441 // Java thread (e.g. VM thread).
442 __try {
443 thread->run();
444 } __except(topLevelExceptionFilter(
445 (_EXCEPTION_POINTERS*)_exception_info())) {
446 // Nothing to do.
447 }
448
449 // One less thread is executing
450 // When the VMThread gets here, the main thread may have already exited
451 // which frees the CodeHeap containing the Atomic::add code
452 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
453 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
454 }
455
456 // Thread must not return from exit_process_or_thread(), but if it does,
457 // let it proceed to exit normally
458 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
459 }
460
461 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
462 int thread_id) {
463 // Allocate the OSThread object
464 OSThread* osthread = new OSThread(NULL, NULL);
465 if (osthread == NULL) return NULL;
466
467 // Initialize support for Java interrupts
468 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
469 if (interrupt_event == NULL) {
470 delete osthread;
471 return NULL;
472 }
473 osthread->set_interrupt_event(interrupt_event);
474
475 // Store info on the Win32 thread into the OSThread
476 osthread->set_thread_handle(thread_handle);
477 osthread->set_thread_id(thread_id);
478
479 if (UseNUMA) {
480 int lgrp_id = os::numa_get_group_id();
481 if (lgrp_id != -1) {
482 thread->set_lgrp_id(lgrp_id);
483 }
484 }
485
486 // Initial thread state is INITIALIZED, not SUSPENDED
487 osthread->set_state(INITIALIZED);
488
489 return osthread;
490 }
491
492
493 bool os::create_attached_thread(JavaThread* thread) {
494 #ifdef ASSERT
495 thread->verify_not_published();
496 #endif
497 HANDLE thread_h;
498 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
499 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
500 fatal("DuplicateHandle failed\n");
501 }
502 OSThread* osthread = create_os_thread(thread, thread_h,
503 (int)current_thread_id());
504 if (osthread == NULL) {
505 return false;
506 }
507
508 // Initial thread state is RUNNABLE
509 osthread->set_state(RUNNABLE);
510
511 thread->set_osthread(osthread);
512 return true;
513 }
514
515 bool os::create_main_thread(JavaThread* thread) {
516 #ifdef ASSERT
517 thread->verify_not_published();
518 #endif
519 if (_starting_thread == NULL) {
520 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
521 if (_starting_thread == NULL) {
522 return false;
523 }
524 }
525
526 // The primordial thread is runnable from the start)
527 _starting_thread->set_state(RUNNABLE);
528
529 thread->set_osthread(_starting_thread);
530 return true;
531 }
532
533 // Allocate and initialize a new OSThread
534 bool os::create_thread(Thread* thread, ThreadType thr_type,
535 size_t stack_size) {
536 unsigned thread_id;
537
538 // Allocate the OSThread object
539 OSThread* osthread = new OSThread(NULL, NULL);
540 if (osthread == NULL) {
541 return false;
542 }
543
544 // Initialize support for Java interrupts
545 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
546 if (interrupt_event == NULL) {
547 delete osthread;
548 return NULL;
549 }
550 osthread->set_interrupt_event(interrupt_event);
551 osthread->set_interrupted(false);
552
553 thread->set_osthread(osthread);
554
555 if (stack_size == 0) {
556 switch (thr_type) {
557 case os::java_thread:
558 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
559 if (JavaThread::stack_size_at_create() > 0) {
560 stack_size = JavaThread::stack_size_at_create();
561 }
562 break;
563 case os::compiler_thread:
564 if (CompilerThreadStackSize > 0) {
565 stack_size = (size_t)(CompilerThreadStackSize * K);
566 break;
567 } // else fall through:
568 // use VMThreadStackSize if CompilerThreadStackSize is not defined
569 case os::vm_thread:
570 case os::pgc_thread:
571 case os::cgc_thread:
572 case os::watcher_thread:
573 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
574 break;
575 }
576 }
577
578 // Create the Win32 thread
579 //
580 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
581 // does not specify stack size. Instead, it specifies the size of
582 // initially committed space. The stack size is determined by
583 // PE header in the executable. If the committed "stack_size" is larger
584 // than default value in the PE header, the stack is rounded up to the
585 // nearest multiple of 1MB. For example if the launcher has default
586 // stack size of 320k, specifying any size less than 320k does not
587 // affect the actual stack size at all, it only affects the initial
588 // commitment. On the other hand, specifying 'stack_size' larger than
589 // default value may cause significant increase in memory usage, because
590 // not only the stack space will be rounded up to MB, but also the
591 // entire space is committed upfront.
592 //
593 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
594 // for CreateThread() that can treat 'stack_size' as stack size. However we
595 // are not supposed to call CreateThread() directly according to MSDN
596 // document because JVM uses C runtime library. The good news is that the
597 // flag appears to work with _beginthredex() as well.
598
599 HANDLE thread_handle =
600 (HANDLE)_beginthreadex(NULL,
601 (unsigned)stack_size,
602 (unsigned (__stdcall *)(void*)) java_start,
603 thread,
604 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
605 &thread_id);
606
607 if (thread_handle == NULL) {
608 // Need to clean up stuff we've allocated so far
609 CloseHandle(osthread->interrupt_event());
610 thread->set_osthread(NULL);
611 delete osthread;
612 return NULL;
613 }
614
615 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
616
617 // Store info on the Win32 thread into the OSThread
618 osthread->set_thread_handle(thread_handle);
619 osthread->set_thread_id(thread_id);
620
621 // Initial thread state is INITIALIZED, not SUSPENDED
622 osthread->set_state(INITIALIZED);
623
624 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
625 return true;
626 }
627
628
629 // Free Win32 resources related to the OSThread
630 void os::free_thread(OSThread* osthread) {
631 assert(osthread != NULL, "osthread not set");
632 CloseHandle(osthread->thread_handle());
633 CloseHandle(osthread->interrupt_event());
634 delete osthread;
635 }
636
637 static jlong first_filetime;
638 static jlong initial_performance_count;
639 static jlong performance_frequency;
640
641
642 jlong as_long(LARGE_INTEGER x) {
643 jlong result = 0; // initialization to avoid warning
644 set_high(&result, x.HighPart);
645 set_low(&result, x.LowPart);
646 return result;
647 }
648
649
650 jlong os::elapsed_counter() {
651 LARGE_INTEGER count;
652 QueryPerformanceCounter(&count);
653 return as_long(count) - initial_performance_count;
654 }
655
656
657 jlong os::elapsed_frequency() {
658 return performance_frequency;
659 }
660
661
662 julong os::available_memory() {
663 return win32::available_memory();
664 }
665
666 julong os::win32::available_memory() {
667 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
668 // value if total memory is larger than 4GB
669 MEMORYSTATUSEX ms;
670 ms.dwLength = sizeof(ms);
671 GlobalMemoryStatusEx(&ms);
672
673 return (julong)ms.ullAvailPhys;
674 }
675
676 julong os::physical_memory() {
677 return win32::physical_memory();
678 }
679
680 bool os::has_allocatable_memory_limit(julong* limit) {
681 MEMORYSTATUSEX ms;
682 ms.dwLength = sizeof(ms);
683 GlobalMemoryStatusEx(&ms);
684 #ifdef _LP64
685 *limit = (julong)ms.ullAvailVirtual;
686 return true;
687 #else
688 // Limit to 1400m because of the 2gb address space wall
689 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
690 return true;
691 #endif
692 }
693
694 int os::active_processor_count() {
695 DWORD_PTR lpProcessAffinityMask = 0;
696 DWORD_PTR lpSystemAffinityMask = 0;
697 int proc_count = processor_count();
698 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
699 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
700 // Nof active processors is number of bits in process affinity mask
701 int bitcount = 0;
702 while (lpProcessAffinityMask != 0) {
703 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
704 bitcount++;
705 }
706 return bitcount;
707 } else {
708 return proc_count;
709 }
710 }
711
712 void os::set_native_thread_name(const char *name) {
713
714 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
715 //
716 // Note that unfortunately this only works if the process
717 // is already attached to a debugger; debugger must observe
718 // the exception below to show the correct name.
719
720 const DWORD MS_VC_EXCEPTION = 0x406D1388;
721 struct {
722 DWORD dwType; // must be 0x1000
723 LPCSTR szName; // pointer to name (in user addr space)
724 DWORD dwThreadID; // thread ID (-1=caller thread)
725 DWORD dwFlags; // reserved for future use, must be zero
726 } info;
727
728 info.dwType = 0x1000;
729 info.szName = name;
730 info.dwThreadID = -1;
731 info.dwFlags = 0;
732
733 __try {
734 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
735 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
736 }
737
738 bool os::distribute_processes(uint length, uint* distribution) {
739 // Not yet implemented.
740 return false;
741 }
742
743 bool os::bind_to_processor(uint processor_id) {
744 // Not yet implemented.
745 return false;
746 }
747
748 void os::win32::initialize_performance_counter() {
749 LARGE_INTEGER count;
750 QueryPerformanceFrequency(&count);
751 performance_frequency = as_long(count);
752 QueryPerformanceCounter(&count);
753 initial_performance_count = as_long(count);
754 }
755
756
757 double os::elapsedTime() {
758 return (double) elapsed_counter() / (double) elapsed_frequency();
759 }
760
761
762 // Windows format:
763 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
764 // Java format:
765 // Java standards require the number of milliseconds since 1/1/1970
766
767 // Constant offset - calculated using offset()
768 static jlong _offset = 116444736000000000;
769 // Fake time counter for reproducible results when debugging
770 static jlong fake_time = 0;
771
772 #ifdef ASSERT
773 // Just to be safe, recalculate the offset in debug mode
774 static jlong _calculated_offset = 0;
775 static int _has_calculated_offset = 0;
776
777 jlong offset() {
778 if (_has_calculated_offset) return _calculated_offset;
779 SYSTEMTIME java_origin;
780 java_origin.wYear = 1970;
781 java_origin.wMonth = 1;
782 java_origin.wDayOfWeek = 0; // ignored
783 java_origin.wDay = 1;
784 java_origin.wHour = 0;
785 java_origin.wMinute = 0;
786 java_origin.wSecond = 0;
787 java_origin.wMilliseconds = 0;
788 FILETIME jot;
789 if (!SystemTimeToFileTime(&java_origin, &jot)) {
790 fatal("Error = %d\nWindows error", GetLastError());
791 }
792 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
793 _has_calculated_offset = 1;
794 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
795 return _calculated_offset;
796 }
797 #else
798 jlong offset() {
799 return _offset;
800 }
801 #endif
802
803 jlong windows_to_java_time(FILETIME wt) {
804 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
805 return (a - offset()) / 10000;
806 }
807
808 // Returns time ticks in (10th of micro seconds)
809 jlong windows_to_time_ticks(FILETIME wt) {
810 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
811 return (a - offset());
812 }
813
814 FILETIME java_to_windows_time(jlong l) {
815 jlong a = (l * 10000) + offset();
816 FILETIME result;
817 result.dwHighDateTime = high(a);
818 result.dwLowDateTime = low(a);
819 return result;
820 }
821
822 bool os::supports_vtime() { return true; }
823 bool os::enable_vtime() { return false; }
824 bool os::vtime_enabled() { return false; }
825
826 double os::elapsedVTime() {
827 FILETIME created;
828 FILETIME exited;
829 FILETIME kernel;
830 FILETIME user;
831 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
832 // the resolution of windows_to_java_time() should be sufficient (ms)
833 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
834 } else {
835 return elapsedTime();
836 }
837 }
838
839 jlong os::javaTimeMillis() {
840 if (UseFakeTimers) {
841 return fake_time++;
842 } else {
843 FILETIME wt;
844 GetSystemTimeAsFileTime(&wt);
845 return windows_to_java_time(wt);
846 }
847 }
848
849 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
850 FILETIME wt;
851 GetSystemTimeAsFileTime(&wt);
852 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
853 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
854 seconds = secs;
855 nanos = jlong(ticks - (secs*10000000)) * 100;
856 }
857
858 jlong os::javaTimeNanos() {
859 LARGE_INTEGER current_count;
860 QueryPerformanceCounter(¤t_count);
861 double current = as_long(current_count);
862 double freq = performance_frequency;
863 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
864 return time;
865 }
866
867 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
868 jlong freq = performance_frequency;
869 if (freq < NANOSECS_PER_SEC) {
870 // the performance counter is 64 bits and we will
871 // be multiplying it -- so no wrap in 64 bits
872 info_ptr->max_value = ALL_64_BITS;
873 } else if (freq > NANOSECS_PER_SEC) {
874 // use the max value the counter can reach to
875 // determine the max value which could be returned
876 julong max_counter = (julong)ALL_64_BITS;
877 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
878 } else {
879 // the performance counter is 64 bits and we will
880 // be using it directly -- so no wrap in 64 bits
881 info_ptr->max_value = ALL_64_BITS;
882 }
883
884 // using a counter, so no skipping
885 info_ptr->may_skip_backward = false;
886 info_ptr->may_skip_forward = false;
887
888 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
889 }
890
891 char* os::local_time_string(char *buf, size_t buflen) {
892 SYSTEMTIME st;
893 GetLocalTime(&st);
894 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
895 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
896 return buf;
897 }
898
899 bool os::getTimesSecs(double* process_real_time,
900 double* process_user_time,
901 double* process_system_time) {
902 HANDLE h_process = GetCurrentProcess();
903 FILETIME create_time, exit_time, kernel_time, user_time;
904 BOOL result = GetProcessTimes(h_process,
905 &create_time,
906 &exit_time,
907 &kernel_time,
908 &user_time);
909 if (result != 0) {
910 FILETIME wt;
911 GetSystemTimeAsFileTime(&wt);
912 jlong rtc_millis = windows_to_java_time(wt);
913 jlong user_millis = windows_to_java_time(user_time);
914 jlong system_millis = windows_to_java_time(kernel_time);
915 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
916 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
917 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
918 return true;
919 } else {
920 return false;
921 }
922 }
923
924 void os::shutdown() {
925 // allow PerfMemory to attempt cleanup of any persistent resources
926 perfMemory_exit();
927
928 // flush buffered output, finish log files
929 ostream_abort();
930
931 // Check for abort hook
932 abort_hook_t abort_hook = Arguments::abort_hook();
933 if (abort_hook != NULL) {
934 abort_hook();
935 }
936 }
937
938
939 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
940 PMINIDUMP_EXCEPTION_INFORMATION,
941 PMINIDUMP_USER_STREAM_INFORMATION,
942 PMINIDUMP_CALLBACK_INFORMATION);
943
944 static HANDLE dumpFile = NULL;
945
946 // Check if dump file can be created.
947 void os::check_dump_limit(char* buffer, size_t buffsz) {
948 bool status = true;
949 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
950 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
951 status = false;
952 }
953
954 #ifndef ASSERT
955 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
956 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
957 status = false;
958 }
959 #endif
960
961 if (status) {
962 const char* cwd = get_current_directory(NULL, 0);
963 int pid = current_process_id();
964 if (cwd != NULL) {
965 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
966 } else {
967 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
968 }
969
970 if (dumpFile == NULL &&
971 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
972 == INVALID_HANDLE_VALUE) {
973 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
974 status = false;
975 }
976 }
977 VMError::record_coredump_status(buffer, status);
978 }
979
980 void os::abort(bool dump_core, void* siginfo, const void* context) {
981 HINSTANCE dbghelp;
982 EXCEPTION_POINTERS ep;
983 MINIDUMP_EXCEPTION_INFORMATION mei;
984 MINIDUMP_EXCEPTION_INFORMATION* pmei;
985
986 HANDLE hProcess = GetCurrentProcess();
987 DWORD processId = GetCurrentProcessId();
988 MINIDUMP_TYPE dumpType;
989
990 shutdown();
991 if (!dump_core || dumpFile == NULL) {
992 if (dumpFile != NULL) {
993 CloseHandle(dumpFile);
994 }
995 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
996 }
997
998 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
999
1000 if (dbghelp == NULL) {
1001 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1002 CloseHandle(dumpFile);
1003 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1004 }
1005
1006 _MiniDumpWriteDump =
1007 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1008 PMINIDUMP_EXCEPTION_INFORMATION,
1009 PMINIDUMP_USER_STREAM_INFORMATION,
1010 PMINIDUMP_CALLBACK_INFORMATION),
1011 GetProcAddress(dbghelp,
1012 "MiniDumpWriteDump"));
1013
1014 if (_MiniDumpWriteDump == NULL) {
1015 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1016 CloseHandle(dumpFile);
1017 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1018 }
1019
1020 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1021 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1022
1023 if (siginfo != NULL && context != NULL) {
1024 ep.ContextRecord = (PCONTEXT) context;
1025 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1026
1027 mei.ThreadId = GetCurrentThreadId();
1028 mei.ExceptionPointers = &ep;
1029 pmei = &mei;
1030 } else {
1031 pmei = NULL;
1032 }
1033
1034 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1035 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1036 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1037 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1038 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1039 }
1040 CloseHandle(dumpFile);
1041 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1042 }
1043
1044 // Die immediately, no exit hook, no abort hook, no cleanup.
1045 void os::die() {
1046 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1047 }
1048
1049 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1050 // * dirent_md.c 1.15 00/02/02
1051 //
1052 // The declarations for DIR and struct dirent are in jvm_win32.h.
1053
1054 // Caller must have already run dirname through JVM_NativePath, which removes
1055 // duplicate slashes and converts all instances of '/' into '\\'.
1056
1057 DIR * os::opendir(const char *dirname) {
1058 assert(dirname != NULL, "just checking"); // hotspot change
1059 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1060 DWORD fattr; // hotspot change
1061 char alt_dirname[4] = { 0, 0, 0, 0 };
1062
1063 if (dirp == 0) {
1064 errno = ENOMEM;
1065 return 0;
1066 }
1067
1068 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1069 // as a directory in FindFirstFile(). We detect this case here and
1070 // prepend the current drive name.
1071 //
1072 if (dirname[1] == '\0' && dirname[0] == '\\') {
1073 alt_dirname[0] = _getdrive() + 'A' - 1;
1074 alt_dirname[1] = ':';
1075 alt_dirname[2] = '\\';
1076 alt_dirname[3] = '\0';
1077 dirname = alt_dirname;
1078 }
1079
1080 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1081 if (dirp->path == 0) {
1082 free(dirp);
1083 errno = ENOMEM;
1084 return 0;
1085 }
1086 strcpy(dirp->path, dirname);
1087
1088 fattr = GetFileAttributes(dirp->path);
1089 if (fattr == 0xffffffff) {
1090 free(dirp->path);
1091 free(dirp);
1092 errno = ENOENT;
1093 return 0;
1094 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1095 free(dirp->path);
1096 free(dirp);
1097 errno = ENOTDIR;
1098 return 0;
1099 }
1100
1101 // Append "*.*", or possibly "\\*.*", to path
1102 if (dirp->path[1] == ':' &&
1103 (dirp->path[2] == '\0' ||
1104 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1105 // No '\\' needed for cases like "Z:" or "Z:\"
1106 strcat(dirp->path, "*.*");
1107 } else {
1108 strcat(dirp->path, "\\*.*");
1109 }
1110
1111 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1112 if (dirp->handle == INVALID_HANDLE_VALUE) {
1113 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1114 free(dirp->path);
1115 free(dirp);
1116 errno = EACCES;
1117 return 0;
1118 }
1119 }
1120 return dirp;
1121 }
1122
1123 // parameter dbuf unused on Windows
1124 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1125 assert(dirp != NULL, "just checking"); // hotspot change
1126 if (dirp->handle == INVALID_HANDLE_VALUE) {
1127 return 0;
1128 }
1129
1130 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1131
1132 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1133 if (GetLastError() == ERROR_INVALID_HANDLE) {
1134 errno = EBADF;
1135 return 0;
1136 }
1137 FindClose(dirp->handle);
1138 dirp->handle = INVALID_HANDLE_VALUE;
1139 }
1140
1141 return &dirp->dirent;
1142 }
1143
1144 int os::closedir(DIR *dirp) {
1145 assert(dirp != NULL, "just checking"); // hotspot change
1146 if (dirp->handle != INVALID_HANDLE_VALUE) {
1147 if (!FindClose(dirp->handle)) {
1148 errno = EBADF;
1149 return -1;
1150 }
1151 dirp->handle = INVALID_HANDLE_VALUE;
1152 }
1153 free(dirp->path);
1154 free(dirp);
1155 return 0;
1156 }
1157
1158 // This must be hard coded because it's the system's temporary
1159 // directory not the java application's temp directory, ala java.io.tmpdir.
1160 const char* os::get_temp_directory() {
1161 static char path_buf[MAX_PATH];
1162 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1163 return path_buf;
1164 } else {
1165 path_buf[0] = '\0';
1166 return path_buf;
1167 }
1168 }
1169
1170 static bool file_exists(const char* filename) {
1171 if (filename == NULL || strlen(filename) == 0) {
1172 return false;
1173 }
1174 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1175 }
1176
1177 bool os::dll_build_name(char *buffer, size_t buflen,
1178 const char* pname, const char* fname) {
1179 bool retval = false;
1180 const size_t pnamelen = pname ? strlen(pname) : 0;
1181 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1182
1183 // Return error on buffer overflow.
1184 if (pnamelen + strlen(fname) + 10 > buflen) {
1185 return retval;
1186 }
1187
1188 if (pnamelen == 0) {
1189 jio_snprintf(buffer, buflen, "%s.dll", fname);
1190 retval = true;
1191 } else if (c == ':' || c == '\\') {
1192 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1193 retval = true;
1194 } else if (strchr(pname, *os::path_separator()) != NULL) {
1195 int n;
1196 char** pelements = split_path(pname, &n);
1197 if (pelements == NULL) {
1198 return false;
1199 }
1200 for (int i = 0; i < n; i++) {
1201 char* path = pelements[i];
1202 // Really shouldn't be NULL, but check can't hurt
1203 size_t plen = (path == NULL) ? 0 : strlen(path);
1204 if (plen == 0) {
1205 continue; // skip the empty path values
1206 }
1207 const char lastchar = path[plen - 1];
1208 if (lastchar == ':' || lastchar == '\\') {
1209 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1210 } else {
1211 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1212 }
1213 if (file_exists(buffer)) {
1214 retval = true;
1215 break;
1216 }
1217 }
1218 // release the storage
1219 for (int i = 0; i < n; i++) {
1220 if (pelements[i] != NULL) {
1221 FREE_C_HEAP_ARRAY(char, pelements[i]);
1222 }
1223 }
1224 if (pelements != NULL) {
1225 FREE_C_HEAP_ARRAY(char*, pelements);
1226 }
1227 } else {
1228 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1229 retval = true;
1230 }
1231 return retval;
1232 }
1233
1234 // Needs to be in os specific directory because windows requires another
1235 // header file <direct.h>
1236 const char* os::get_current_directory(char *buf, size_t buflen) {
1237 int n = static_cast<int>(buflen);
1238 if (buflen > INT_MAX) n = INT_MAX;
1239 return _getcwd(buf, n);
1240 }
1241
1242 //-----------------------------------------------------------
1243 // Helper functions for fatal error handler
1244 #ifdef _WIN64
1245 // Helper routine which returns true if address in
1246 // within the NTDLL address space.
1247 //
1248 static bool _addr_in_ntdll(address addr) {
1249 HMODULE hmod;
1250 MODULEINFO minfo;
1251
1252 hmod = GetModuleHandle("NTDLL.DLL");
1253 if (hmod == NULL) return false;
1254 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1255 &minfo, sizeof(MODULEINFO))) {
1256 return false;
1257 }
1258
1259 if ((addr >= minfo.lpBaseOfDll) &&
1260 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1261 return true;
1262 } else {
1263 return false;
1264 }
1265 }
1266 #endif
1267
1268 struct _modinfo {
1269 address addr;
1270 char* full_path; // point to a char buffer
1271 int buflen; // size of the buffer
1272 address base_addr;
1273 };
1274
1275 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1276 address top_address, void * param) {
1277 struct _modinfo *pmod = (struct _modinfo *)param;
1278 if (!pmod) return -1;
1279
1280 if (base_addr <= pmod->addr &&
1281 top_address > pmod->addr) {
1282 // if a buffer is provided, copy path name to the buffer
1283 if (pmod->full_path) {
1284 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1285 }
1286 pmod->base_addr = base_addr;
1287 return 1;
1288 }
1289 return 0;
1290 }
1291
1292 bool os::dll_address_to_library_name(address addr, char* buf,
1293 int buflen, int* offset) {
1294 // buf is not optional, but offset is optional
1295 assert(buf != NULL, "sanity check");
1296
1297 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1298 // return the full path to the DLL file, sometimes it returns path
1299 // to the corresponding PDB file (debug info); sometimes it only
1300 // returns partial path, which makes life painful.
1301
1302 struct _modinfo mi;
1303 mi.addr = addr;
1304 mi.full_path = buf;
1305 mi.buflen = buflen;
1306 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1307 // buf already contains path name
1308 if (offset) *offset = addr - mi.base_addr;
1309 return true;
1310 }
1311
1312 buf[0] = '\0';
1313 if (offset) *offset = -1;
1314 return false;
1315 }
1316
1317 bool os::dll_address_to_function_name(address addr, char *buf,
1318 int buflen, int *offset,
1319 bool demangle) {
1320 // buf is not optional, but offset is optional
1321 assert(buf != NULL, "sanity check");
1322
1323 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1324 return true;
1325 }
1326 if (offset != NULL) *offset = -1;
1327 buf[0] = '\0';
1328 return false;
1329 }
1330
1331 // save the start and end address of jvm.dll into param[0] and param[1]
1332 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 if (!param) return -1;
1335
1336 if (base_addr <= (address)_locate_jvm_dll &&
1337 top_address > (address)_locate_jvm_dll) {
1338 ((address*)param)[0] = base_addr;
1339 ((address*)param)[1] = top_address;
1340 return 1;
1341 }
1342 return 0;
1343 }
1344
1345 address vm_lib_location[2]; // start and end address of jvm.dll
1346
1347 // check if addr is inside jvm.dll
1348 bool os::address_is_in_vm(address addr) {
1349 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1350 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1351 assert(false, "Can't find jvm module.");
1352 return false;
1353 }
1354 }
1355
1356 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1357 }
1358
1359 // print module info; param is outputStream*
1360 static int _print_module(const char* fname, address base_address,
1361 address top_address, void* param) {
1362 if (!param) return -1;
1363
1364 outputStream* st = (outputStream*)param;
1365
1366 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1367 return 0;
1368 }
1369
1370 // Loads .dll/.so and
1371 // in case of error it checks if .dll/.so was built for the
1372 // same architecture as Hotspot is running on
1373 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1374 void * result = LoadLibrary(name);
1375 if (result != NULL) {
1376 return result;
1377 }
1378
1379 DWORD errcode = GetLastError();
1380 if (errcode == ERROR_MOD_NOT_FOUND) {
1381 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1382 ebuf[ebuflen - 1] = '\0';
1383 return NULL;
1384 }
1385
1386 // Parsing dll below
1387 // If we can read dll-info and find that dll was built
1388 // for an architecture other than Hotspot is running in
1389 // - then print to buffer "DLL was built for a different architecture"
1390 // else call os::lasterror to obtain system error message
1391
1392 // Read system error message into ebuf
1393 // It may or may not be overwritten below (in the for loop and just above)
1394 lasterror(ebuf, (size_t) ebuflen);
1395 ebuf[ebuflen - 1] = '\0';
1396 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1397 if (fd < 0) {
1398 return NULL;
1399 }
1400
1401 uint32_t signature_offset;
1402 uint16_t lib_arch = 0;
1403 bool failed_to_get_lib_arch =
1404 ( // Go to position 3c in the dll
1405 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1406 ||
1407 // Read location of signature
1408 (sizeof(signature_offset) !=
1409 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1410 ||
1411 // Go to COFF File Header in dll
1412 // that is located after "signature" (4 bytes long)
1413 (os::seek_to_file_offset(fd,
1414 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1415 ||
1416 // Read field that contains code of architecture
1417 // that dll was built for
1418 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1419 );
1420
1421 ::close(fd);
1422 if (failed_to_get_lib_arch) {
1423 // file i/o error - report os::lasterror(...) msg
1424 return NULL;
1425 }
1426
1427 typedef struct {
1428 uint16_t arch_code;
1429 char* arch_name;
1430 } arch_t;
1431
1432 static const arch_t arch_array[] = {
1433 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1434 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1435 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1436 };
1437 #if (defined _M_IA64)
1438 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1439 #elif (defined _M_AMD64)
1440 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1441 #elif (defined _M_IX86)
1442 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1443 #else
1444 #error Method os::dll_load requires that one of following \
1445 is defined :_M_IA64,_M_AMD64 or _M_IX86
1446 #endif
1447
1448
1449 // Obtain a string for printf operation
1450 // lib_arch_str shall contain string what platform this .dll was built for
1451 // running_arch_str shall string contain what platform Hotspot was built for
1452 char *running_arch_str = NULL, *lib_arch_str = NULL;
1453 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1454 if (lib_arch == arch_array[i].arch_code) {
1455 lib_arch_str = arch_array[i].arch_name;
1456 }
1457 if (running_arch == arch_array[i].arch_code) {
1458 running_arch_str = arch_array[i].arch_name;
1459 }
1460 }
1461
1462 assert(running_arch_str,
1463 "Didn't find running architecture code in arch_array");
1464
1465 // If the architecture is right
1466 // but some other error took place - report os::lasterror(...) msg
1467 if (lib_arch == running_arch) {
1468 return NULL;
1469 }
1470
1471 if (lib_arch_str != NULL) {
1472 ::_snprintf(ebuf, ebuflen - 1,
1473 "Can't load %s-bit .dll on a %s-bit platform",
1474 lib_arch_str, running_arch_str);
1475 } else {
1476 // don't know what architecture this dll was build for
1477 ::_snprintf(ebuf, ebuflen - 1,
1478 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1479 lib_arch, running_arch_str);
1480 }
1481
1482 return NULL;
1483 }
1484
1485 void os::print_dll_info(outputStream *st) {
1486 st->print_cr("Dynamic libraries:");
1487 get_loaded_modules_info(_print_module, (void *)st);
1488 }
1489
1490 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1491 HANDLE hProcess;
1492
1493 # define MAX_NUM_MODULES 128
1494 HMODULE modules[MAX_NUM_MODULES];
1495 static char filename[MAX_PATH];
1496 int result = 0;
1497
1498 int pid = os::current_process_id();
1499 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1500 FALSE, pid);
1501 if (hProcess == NULL) return 0;
1502
1503 DWORD size_needed;
1504 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1505 CloseHandle(hProcess);
1506 return 0;
1507 }
1508
1509 // number of modules that are currently loaded
1510 int num_modules = size_needed / sizeof(HMODULE);
1511
1512 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1513 // Get Full pathname:
1514 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1515 filename[0] = '\0';
1516 }
1517
1518 MODULEINFO modinfo;
1519 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1520 modinfo.lpBaseOfDll = NULL;
1521 modinfo.SizeOfImage = 0;
1522 }
1523
1524 // Invoke callback function
1525 result = callback(filename, (address)modinfo.lpBaseOfDll,
1526 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1527 if (result) break;
1528 }
1529
1530 CloseHandle(hProcess);
1531 return result;
1532 }
1533
1534 #ifndef PRODUCT
1535 bool os::get_host_name(char* buf, size_t buflen) {
1536 DWORD size = (DWORD)buflen;
1537 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1538 }
1539 #endif // PRODUCT
1540
1541 void os::get_summary_os_info(char* buf, size_t buflen) {
1542 stringStream sst(buf, buflen);
1543 os::win32::print_windows_version(&sst);
1544 // chop off newline character
1545 char* nl = strchr(buf, '\n');
1546 if (nl != NULL) *nl = '\0';
1547 }
1548
1549 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1550 int ret = vsnprintf(buf, len, fmt, args);
1551 // Get the correct buffer size if buf is too small
1552 if (ret < 0) {
1553 return _vscprintf(fmt, args);
1554 }
1555 return ret;
1556 }
1557
1558 void os::print_os_info_brief(outputStream* st) {
1559 os::print_os_info(st);
1560 }
1561
1562 void os::print_os_info(outputStream* st) {
1563 #ifdef ASSERT
1564 char buffer[1024];
1565 st->print("HostName: ");
1566 if (get_host_name(buffer, sizeof(buffer))) {
1567 st->print("%s ", buffer);
1568 } else {
1569 st->print("N/A ");
1570 }
1571 #endif
1572 st->print("OS:");
1573 os::win32::print_windows_version(st);
1574 }
1575
1576 void os::win32::print_windows_version(outputStream* st) {
1577 OSVERSIONINFOEX osvi;
1578 VS_FIXEDFILEINFO *file_info;
1579 TCHAR kernel32_path[MAX_PATH];
1580 UINT len, ret;
1581
1582 // Use the GetVersionEx information to see if we're on a server or
1583 // workstation edition of Windows. Starting with Windows 8.1 we can't
1584 // trust the OS version information returned by this API.
1585 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1586 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1587 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1588 st->print_cr("Call to GetVersionEx failed");
1589 return;
1590 }
1591 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1592
1593 // Get the full path to \Windows\System32\kernel32.dll and use that for
1594 // determining what version of Windows we're running on.
1595 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1596 ret = GetSystemDirectory(kernel32_path, len);
1597 if (ret == 0 || ret > len) {
1598 st->print_cr("Call to GetSystemDirectory failed");
1599 return;
1600 }
1601 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1602
1603 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1604 if (version_size == 0) {
1605 st->print_cr("Call to GetFileVersionInfoSize failed");
1606 return;
1607 }
1608
1609 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1610 if (version_info == NULL) {
1611 st->print_cr("Failed to allocate version_info");
1612 return;
1613 }
1614
1615 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1616 os::free(version_info);
1617 st->print_cr("Call to GetFileVersionInfo failed");
1618 return;
1619 }
1620
1621 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1622 os::free(version_info);
1623 st->print_cr("Call to VerQueryValue failed");
1624 return;
1625 }
1626
1627 int major_version = HIWORD(file_info->dwProductVersionMS);
1628 int minor_version = LOWORD(file_info->dwProductVersionMS);
1629 int build_number = HIWORD(file_info->dwProductVersionLS);
1630 int build_minor = LOWORD(file_info->dwProductVersionLS);
1631 int os_vers = major_version * 1000 + minor_version;
1632 os::free(version_info);
1633
1634 st->print(" Windows ");
1635 switch (os_vers) {
1636
1637 case 6000:
1638 if (is_workstation) {
1639 st->print("Vista");
1640 } else {
1641 st->print("Server 2008");
1642 }
1643 break;
1644
1645 case 6001:
1646 if (is_workstation) {
1647 st->print("7");
1648 } else {
1649 st->print("Server 2008 R2");
1650 }
1651 break;
1652
1653 case 6002:
1654 if (is_workstation) {
1655 st->print("8");
1656 } else {
1657 st->print("Server 2012");
1658 }
1659 break;
1660
1661 case 6003:
1662 if (is_workstation) {
1663 st->print("8.1");
1664 } else {
1665 st->print("Server 2012 R2");
1666 }
1667 break;
1668
1669 case 10000:
1670 if (is_workstation) {
1671 st->print("10");
1672 } else {
1673 // The server version name of Windows 10 is not known at this time
1674 st->print("%d.%d", major_version, minor_version);
1675 }
1676 break;
1677
1678 default:
1679 // Unrecognized windows, print out its major and minor versions
1680 st->print("%d.%d", major_version, minor_version);
1681 break;
1682 }
1683
1684 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1685 // find out whether we are running on 64 bit processor or not
1686 SYSTEM_INFO si;
1687 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1688 GetNativeSystemInfo(&si);
1689 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1690 st->print(" , 64 bit");
1691 }
1692
1693 st->print(" Build %d", build_number);
1694 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1695 st->cr();
1696 }
1697
1698 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1699 // Nothing to do for now.
1700 }
1701
1702 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1703 HKEY key;
1704 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1705 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1706 if (status == ERROR_SUCCESS) {
1707 DWORD size = (DWORD)buflen;
1708 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1709 if (status != ERROR_SUCCESS) {
1710 strncpy(buf, "## __CPU__", buflen);
1711 }
1712 RegCloseKey(key);
1713 } else {
1714 // Put generic cpu info to return
1715 strncpy(buf, "## __CPU__", buflen);
1716 }
1717 }
1718
1719 void os::print_memory_info(outputStream* st) {
1720 st->print("Memory:");
1721 st->print(" %dk page", os::vm_page_size()>>10);
1722
1723 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1724 // value if total memory is larger than 4GB
1725 MEMORYSTATUSEX ms;
1726 ms.dwLength = sizeof(ms);
1727 GlobalMemoryStatusEx(&ms);
1728
1729 st->print(", physical %uk", os::physical_memory() >> 10);
1730 st->print("(%uk free)", os::available_memory() >> 10);
1731
1732 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1733 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1734 st->cr();
1735 }
1736
1737 void os::print_siginfo(outputStream *st, const void* siginfo) {
1738 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1739 st->print("siginfo:");
1740
1741 char tmp[64];
1742 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1743 strcpy(tmp, "EXCEPTION_??");
1744 }
1745 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1746
1747 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1748 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1749 er->NumberParameters >= 2) {
1750 switch (er->ExceptionInformation[0]) {
1751 case 0: st->print(", reading address"); break;
1752 case 1: st->print(", writing address"); break;
1753 case 8: st->print(", data execution prevention violation at address"); break;
1754 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1755 er->ExceptionInformation[0]);
1756 }
1757 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1758 } else {
1759 int num = er->NumberParameters;
1760 if (num > 0) {
1761 st->print(", ExceptionInformation=");
1762 for (int i = 0; i < num; i++) {
1763 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1764 }
1765 }
1766 }
1767 st->cr();
1768 }
1769
1770 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1771 // do nothing
1772 }
1773
1774 static char saved_jvm_path[MAX_PATH] = {0};
1775
1776 // Find the full path to the current module, jvm.dll
1777 void os::jvm_path(char *buf, jint buflen) {
1778 // Error checking.
1779 if (buflen < MAX_PATH) {
1780 assert(false, "must use a large-enough buffer");
1781 buf[0] = '\0';
1782 return;
1783 }
1784 // Lazy resolve the path to current module.
1785 if (saved_jvm_path[0] != 0) {
1786 strcpy(buf, saved_jvm_path);
1787 return;
1788 }
1789
1790 buf[0] = '\0';
1791 if (Arguments::sun_java_launcher_is_altjvm()) {
1792 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1793 // for a JAVA_HOME environment variable and fix up the path so it
1794 // looks like jvm.dll is installed there (append a fake suffix
1795 // hotspot/jvm.dll).
1796 char* java_home_var = ::getenv("JAVA_HOME");
1797 if (java_home_var != NULL && java_home_var[0] != 0 &&
1798 strlen(java_home_var) < (size_t)buflen) {
1799 strncpy(buf, java_home_var, buflen);
1800
1801 // determine if this is a legacy image or modules image
1802 // modules image doesn't have "jre" subdirectory
1803 size_t len = strlen(buf);
1804 char* jrebin_p = buf + len;
1805 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1806 if (0 != _access(buf, 0)) {
1807 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1808 }
1809 len = strlen(buf);
1810 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1811 }
1812 }
1813
1814 if (buf[0] == '\0') {
1815 GetModuleFileName(vm_lib_handle, buf, buflen);
1816 }
1817 strncpy(saved_jvm_path, buf, MAX_PATH);
1818 saved_jvm_path[MAX_PATH - 1] = '\0';
1819 }
1820
1821
1822 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1823 #ifndef _WIN64
1824 st->print("_");
1825 #endif
1826 }
1827
1828
1829 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1830 #ifndef _WIN64
1831 st->print("@%d", args_size * sizeof(int));
1832 #endif
1833 }
1834
1835 // This method is a copy of JDK's sysGetLastErrorString
1836 // from src/windows/hpi/src/system_md.c
1837
1838 size_t os::lasterror(char* buf, size_t len) {
1839 DWORD errval;
1840
1841 if ((errval = GetLastError()) != 0) {
1842 // DOS error
1843 size_t n = (size_t)FormatMessage(
1844 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1845 NULL,
1846 errval,
1847 0,
1848 buf,
1849 (DWORD)len,
1850 NULL);
1851 if (n > 3) {
1852 // Drop final '.', CR, LF
1853 if (buf[n - 1] == '\n') n--;
1854 if (buf[n - 1] == '\r') n--;
1855 if (buf[n - 1] == '.') n--;
1856 buf[n] = '\0';
1857 }
1858 return n;
1859 }
1860
1861 if (errno != 0) {
1862 // C runtime error that has no corresponding DOS error code
1863 const char* s = strerror(errno);
1864 size_t n = strlen(s);
1865 if (n >= len) n = len - 1;
1866 strncpy(buf, s, n);
1867 buf[n] = '\0';
1868 return n;
1869 }
1870
1871 return 0;
1872 }
1873
1874 int os::get_last_error() {
1875 DWORD error = GetLastError();
1876 if (error == 0) {
1877 error = errno;
1878 }
1879 return (int)error;
1880 }
1881
1882 WindowsSemaphore::WindowsSemaphore(uint value) {
1883 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1884
1885 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1886 }
1887
1888 WindowsSemaphore::~WindowsSemaphore() {
1889 ::CloseHandle(_semaphore);
1890 }
1891
1892 void WindowsSemaphore::signal(uint count) {
1893 if (count > 0) {
1894 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1895
1896 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1897 }
1898 }
1899
1900 void WindowsSemaphore::wait() {
1901 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1902 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1903 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1904 }
1905
1906 // sun.misc.Signal
1907 // NOTE that this is a workaround for an apparent kernel bug where if
1908 // a signal handler for SIGBREAK is installed then that signal handler
1909 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1910 // See bug 4416763.
1911 static void (*sigbreakHandler)(int) = NULL;
1912
1913 static void UserHandler(int sig, void *siginfo, void *context) {
1914 os::signal_notify(sig);
1915 // We need to reinstate the signal handler each time...
1916 os::signal(sig, (void*)UserHandler);
1917 }
1918
1919 void* os::user_handler() {
1920 return (void*) UserHandler;
1921 }
1922
1923 void* os::signal(int signal_number, void* handler) {
1924 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1925 void (*oldHandler)(int) = sigbreakHandler;
1926 sigbreakHandler = (void (*)(int)) handler;
1927 return (void*) oldHandler;
1928 } else {
1929 return (void*)::signal(signal_number, (void (*)(int))handler);
1930 }
1931 }
1932
1933 void os::signal_raise(int signal_number) {
1934 raise(signal_number);
1935 }
1936
1937 // The Win32 C runtime library maps all console control events other than ^C
1938 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1939 // logoff, and shutdown events. We therefore install our own console handler
1940 // that raises SIGTERM for the latter cases.
1941 //
1942 static BOOL WINAPI consoleHandler(DWORD event) {
1943 switch (event) {
1944 case CTRL_C_EVENT:
1945 if (is_error_reported()) {
1946 // Ctrl-C is pressed during error reporting, likely because the error
1947 // handler fails to abort. Let VM die immediately.
1948 os::die();
1949 }
1950
1951 os::signal_raise(SIGINT);
1952 return TRUE;
1953 break;
1954 case CTRL_BREAK_EVENT:
1955 if (sigbreakHandler != NULL) {
1956 (*sigbreakHandler)(SIGBREAK);
1957 }
1958 return TRUE;
1959 break;
1960 case CTRL_LOGOFF_EVENT: {
1961 // Don't terminate JVM if it is running in a non-interactive session,
1962 // such as a service process.
1963 USEROBJECTFLAGS flags;
1964 HANDLE handle = GetProcessWindowStation();
1965 if (handle != NULL &&
1966 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1967 sizeof(USEROBJECTFLAGS), NULL)) {
1968 // If it is a non-interactive session, let next handler to deal
1969 // with it.
1970 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1971 return FALSE;
1972 }
1973 }
1974 }
1975 case CTRL_CLOSE_EVENT:
1976 case CTRL_SHUTDOWN_EVENT:
1977 os::signal_raise(SIGTERM);
1978 return TRUE;
1979 break;
1980 default:
1981 break;
1982 }
1983 return FALSE;
1984 }
1985
1986 // The following code is moved from os.cpp for making this
1987 // code platform specific, which it is by its very nature.
1988
1989 // Return maximum OS signal used + 1 for internal use only
1990 // Used as exit signal for signal_thread
1991 int os::sigexitnum_pd() {
1992 return NSIG;
1993 }
1994
1995 // a counter for each possible signal value, including signal_thread exit signal
1996 static volatile jint pending_signals[NSIG+1] = { 0 };
1997 static HANDLE sig_sem = NULL;
1998
1999 void os::signal_init_pd() {
2000 // Initialize signal structures
2001 memset((void*)pending_signals, 0, sizeof(pending_signals));
2002
2003 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2004
2005 // Programs embedding the VM do not want it to attempt to receive
2006 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2007 // shutdown hooks mechanism introduced in 1.3. For example, when
2008 // the VM is run as part of a Windows NT service (i.e., a servlet
2009 // engine in a web server), the correct behavior is for any console
2010 // control handler to return FALSE, not TRUE, because the OS's
2011 // "final" handler for such events allows the process to continue if
2012 // it is a service (while terminating it if it is not a service).
2013 // To make this behavior uniform and the mechanism simpler, we
2014 // completely disable the VM's usage of these console events if -Xrs
2015 // (=ReduceSignalUsage) is specified. This means, for example, that
2016 // the CTRL-BREAK thread dump mechanism is also disabled in this
2017 // case. See bugs 4323062, 4345157, and related bugs.
2018
2019 if (!ReduceSignalUsage) {
2020 // Add a CTRL-C handler
2021 SetConsoleCtrlHandler(consoleHandler, TRUE);
2022 }
2023 }
2024
2025 void os::signal_notify(int signal_number) {
2026 BOOL ret;
2027 if (sig_sem != NULL) {
2028 Atomic::inc(&pending_signals[signal_number]);
2029 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2030 assert(ret != 0, "ReleaseSemaphore() failed");
2031 }
2032 }
2033
2034 static int check_pending_signals(bool wait_for_signal) {
2035 DWORD ret;
2036 while (true) {
2037 for (int i = 0; i < NSIG + 1; i++) {
2038 jint n = pending_signals[i];
2039 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2040 return i;
2041 }
2042 }
2043 if (!wait_for_signal) {
2044 return -1;
2045 }
2046
2047 JavaThread *thread = JavaThread::current();
2048
2049 ThreadBlockInVM tbivm(thread);
2050
2051 bool threadIsSuspended;
2052 do {
2053 thread->set_suspend_equivalent();
2054 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2055 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2056 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2057
2058 // were we externally suspended while we were waiting?
2059 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2060 if (threadIsSuspended) {
2061 // The semaphore has been incremented, but while we were waiting
2062 // another thread suspended us. We don't want to continue running
2063 // while suspended because that would surprise the thread that
2064 // suspended us.
2065 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2066 assert(ret != 0, "ReleaseSemaphore() failed");
2067
2068 thread->java_suspend_self();
2069 }
2070 } while (threadIsSuspended);
2071 }
2072 }
2073
2074 int os::signal_lookup() {
2075 return check_pending_signals(false);
2076 }
2077
2078 int os::signal_wait() {
2079 return check_pending_signals(true);
2080 }
2081
2082 // Implicit OS exception handling
2083
2084 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2085 address handler) {
2086 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2087 // Save pc in thread
2088 #ifdef _M_IA64
2089 // Do not blow up if no thread info available.
2090 if (thread) {
2091 // Saving PRECISE pc (with slot information) in thread.
2092 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2093 // Convert precise PC into "Unix" format
2094 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2095 thread->set_saved_exception_pc((address)precise_pc);
2096 }
2097 // Set pc to handler
2098 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2099 // Clear out psr.ri (= Restart Instruction) in order to continue
2100 // at the beginning of the target bundle.
2101 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2102 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2103 #else
2104 #ifdef _M_AMD64
2105 // Do not blow up if no thread info available.
2106 if (thread) {
2107 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2108 }
2109 // Set pc to handler
2110 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2111 #else
2112 // Do not blow up if no thread info available.
2113 if (thread) {
2114 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2115 }
2116 // Set pc to handler
2117 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2118 #endif
2119 #endif
2120
2121 // Continue the execution
2122 return EXCEPTION_CONTINUE_EXECUTION;
2123 }
2124
2125
2126 // Used for PostMortemDump
2127 extern "C" void safepoints();
2128 extern "C" void find(int x);
2129 extern "C" void events();
2130
2131 // According to Windows API documentation, an illegal instruction sequence should generate
2132 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2133 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2134 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2135
2136 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2137
2138 // From "Execution Protection in the Windows Operating System" draft 0.35
2139 // Once a system header becomes available, the "real" define should be
2140 // included or copied here.
2141 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2142
2143 // Handle NAT Bit consumption on IA64.
2144 #ifdef _M_IA64
2145 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2146 #endif
2147
2148 // Windows Vista/2008 heap corruption check
2149 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2150
2151 #define def_excpt(val) #val, val
2152
2153 struct siglabel {
2154 char *name;
2155 int number;
2156 };
2157
2158 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2159 // C++ compiler contain this error code. Because this is a compiler-generated
2160 // error, the code is not listed in the Win32 API header files.
2161 // The code is actually a cryptic mnemonic device, with the initial "E"
2162 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2163 // ASCII values of "msc".
2164
2165 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2166
2167
2168 struct siglabel exceptlabels[] = {
2169 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2170 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2171 def_excpt(EXCEPTION_BREAKPOINT),
2172 def_excpt(EXCEPTION_SINGLE_STEP),
2173 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2174 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2175 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2176 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2177 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2178 def_excpt(EXCEPTION_FLT_OVERFLOW),
2179 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2180 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2181 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2182 def_excpt(EXCEPTION_INT_OVERFLOW),
2183 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2184 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2185 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2186 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2187 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2188 def_excpt(EXCEPTION_STACK_OVERFLOW),
2189 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2190 def_excpt(EXCEPTION_GUARD_PAGE),
2191 def_excpt(EXCEPTION_INVALID_HANDLE),
2192 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2193 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2194 #ifdef _M_IA64
2195 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2196 #endif
2197 NULL, 0
2198 };
2199
2200 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2201 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2202 if (exceptlabels[i].number == exception_code) {
2203 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2204 return buf;
2205 }
2206 }
2207
2208 return NULL;
2209 }
2210
2211 //-----------------------------------------------------------------------------
2212 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2213 // handle exception caused by idiv; should only happen for -MinInt/-1
2214 // (division by zero is handled explicitly)
2215 #ifdef _M_IA64
2216 assert(0, "Fix Handle_IDiv_Exception");
2217 #else
2218 #ifdef _M_AMD64
2219 PCONTEXT ctx = exceptionInfo->ContextRecord;
2220 address pc = (address)ctx->Rip;
2221 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2222 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2223 if (pc[0] == 0xF7) {
2224 // set correct result values and continue after idiv instruction
2225 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2226 } else {
2227 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2228 }
2229 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2230 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2231 // idiv opcode (0xF7).
2232 ctx->Rdx = (DWORD)0; // remainder
2233 // Continue the execution
2234 #else
2235 PCONTEXT ctx = exceptionInfo->ContextRecord;
2236 address pc = (address)ctx->Eip;
2237 assert(pc[0] == 0xF7, "not an idiv opcode");
2238 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2239 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2240 // set correct result values and continue after idiv instruction
2241 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2242 ctx->Eax = (DWORD)min_jint; // result
2243 ctx->Edx = (DWORD)0; // remainder
2244 // Continue the execution
2245 #endif
2246 #endif
2247 return EXCEPTION_CONTINUE_EXECUTION;
2248 }
2249
2250 //-----------------------------------------------------------------------------
2251 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2252 PCONTEXT ctx = exceptionInfo->ContextRecord;
2253 #ifndef _WIN64
2254 // handle exception caused by native method modifying control word
2255 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2256
2257 switch (exception_code) {
2258 case EXCEPTION_FLT_DENORMAL_OPERAND:
2259 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2260 case EXCEPTION_FLT_INEXACT_RESULT:
2261 case EXCEPTION_FLT_INVALID_OPERATION:
2262 case EXCEPTION_FLT_OVERFLOW:
2263 case EXCEPTION_FLT_STACK_CHECK:
2264 case EXCEPTION_FLT_UNDERFLOW:
2265 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2266 if (fp_control_word != ctx->FloatSave.ControlWord) {
2267 // Restore FPCW and mask out FLT exceptions
2268 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2269 // Mask out pending FLT exceptions
2270 ctx->FloatSave.StatusWord &= 0xffffff00;
2271 return EXCEPTION_CONTINUE_EXECUTION;
2272 }
2273 }
2274
2275 if (prev_uef_handler != NULL) {
2276 // We didn't handle this exception so pass it to the previous
2277 // UnhandledExceptionFilter.
2278 return (prev_uef_handler)(exceptionInfo);
2279 }
2280 #else // !_WIN64
2281 // On Windows, the mxcsr control bits are non-volatile across calls
2282 // See also CR 6192333
2283 //
2284 jint MxCsr = INITIAL_MXCSR;
2285 // we can't use StubRoutines::addr_mxcsr_std()
2286 // because in Win64 mxcsr is not saved there
2287 if (MxCsr != ctx->MxCsr) {
2288 ctx->MxCsr = MxCsr;
2289 return EXCEPTION_CONTINUE_EXECUTION;
2290 }
2291 #endif // !_WIN64
2292
2293 return EXCEPTION_CONTINUE_SEARCH;
2294 }
2295
2296 static inline void report_error(Thread* t, DWORD exception_code,
2297 address addr, void* siginfo, void* context) {
2298 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2299
2300 // If UseOsErrorReporting, this will return here and save the error file
2301 // somewhere where we can find it in the minidump.
2302 }
2303
2304 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2305 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2306 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2307 address addr = (address) exceptionRecord->ExceptionInformation[1];
2308 if (Interpreter::contains(pc)) {
2309 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2310 if (!fr->is_first_java_frame()) {
2311 assert(fr->safe_for_sender(thread), "Safety check");
2312 *fr = fr->java_sender();
2313 }
2314 } else {
2315 // more complex code with compiled code
2316 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2317 CodeBlob* cb = CodeCache::find_blob(pc);
2318 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2319 // Not sure where the pc points to, fallback to default
2320 // stack overflow handling
2321 return false;
2322 } else {
2323 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2324 // in compiled code, the stack banging is performed just after the return pc
2325 // has been pushed on the stack
2326 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2327 if (!fr->is_java_frame()) {
2328 assert(fr->safe_for_sender(thread), "Safety check");
2329 *fr = fr->java_sender();
2330 }
2331 }
2332 }
2333 assert(fr->is_java_frame(), "Safety check");
2334 return true;
2335 }
2336
2337 //-----------------------------------------------------------------------------
2338 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2339 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2340 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2341 #ifdef _M_IA64
2342 // On Itanium, we need the "precise pc", which has the slot number coded
2343 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2344 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2345 // Convert the pc to "Unix format", which has the slot number coded
2346 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2347 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2348 // information is saved in the Unix format.
2349 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2350 #else
2351 #ifdef _M_AMD64
2352 address pc = (address) exceptionInfo->ContextRecord->Rip;
2353 #else
2354 address pc = (address) exceptionInfo->ContextRecord->Eip;
2355 #endif
2356 #endif
2357 Thread* t = Thread::current_or_null_safe();
2358
2359 // Handle SafeFetch32 and SafeFetchN exceptions.
2360 if (StubRoutines::is_safefetch_fault(pc)) {
2361 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2362 }
2363
2364 #ifndef _WIN64
2365 // Execution protection violation - win32 running on AMD64 only
2366 // Handled first to avoid misdiagnosis as a "normal" access violation;
2367 // This is safe to do because we have a new/unique ExceptionInformation
2368 // code for this condition.
2369 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2370 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2371 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2372 address addr = (address) exceptionRecord->ExceptionInformation[1];
2373
2374 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2375 int page_size = os::vm_page_size();
2376
2377 // Make sure the pc and the faulting address are sane.
2378 //
2379 // If an instruction spans a page boundary, and the page containing
2380 // the beginning of the instruction is executable but the following
2381 // page is not, the pc and the faulting address might be slightly
2382 // different - we still want to unguard the 2nd page in this case.
2383 //
2384 // 15 bytes seems to be a (very) safe value for max instruction size.
2385 bool pc_is_near_addr =
2386 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2387 bool instr_spans_page_boundary =
2388 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2389 (intptr_t) page_size) > 0);
2390
2391 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2392 static volatile address last_addr =
2393 (address) os::non_memory_address_word();
2394
2395 // In conservative mode, don't unguard unless the address is in the VM
2396 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2397 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2398
2399 // Set memory to RWX and retry
2400 address page_start =
2401 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2402 bool res = os::protect_memory((char*) page_start, page_size,
2403 os::MEM_PROT_RWX);
2404
2405 if (PrintMiscellaneous && Verbose) {
2406 char buf[256];
2407 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2408 "at " INTPTR_FORMAT
2409 ", unguarding " INTPTR_FORMAT ": %s", addr,
2410 page_start, (res ? "success" : strerror(errno)));
2411 tty->print_raw_cr(buf);
2412 }
2413
2414 // Set last_addr so if we fault again at the same address, we don't
2415 // end up in an endless loop.
2416 //
2417 // There are two potential complications here. Two threads trapping
2418 // at the same address at the same time could cause one of the
2419 // threads to think it already unguarded, and abort the VM. Likely
2420 // very rare.
2421 //
2422 // The other race involves two threads alternately trapping at
2423 // different addresses and failing to unguard the page, resulting in
2424 // an endless loop. This condition is probably even more unlikely
2425 // than the first.
2426 //
2427 // Although both cases could be avoided by using locks or thread
2428 // local last_addr, these solutions are unnecessary complication:
2429 // this handler is a best-effort safety net, not a complete solution.
2430 // It is disabled by default and should only be used as a workaround
2431 // in case we missed any no-execute-unsafe VM code.
2432
2433 last_addr = addr;
2434
2435 return EXCEPTION_CONTINUE_EXECUTION;
2436 }
2437 }
2438
2439 // Last unguard failed or not unguarding
2440 tty->print_raw_cr("Execution protection violation");
2441 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2442 exceptionInfo->ContextRecord);
2443 return EXCEPTION_CONTINUE_SEARCH;
2444 }
2445 }
2446 #endif // _WIN64
2447
2448 // Check to see if we caught the safepoint code in the
2449 // process of write protecting the memory serialization page.
2450 // It write enables the page immediately after protecting it
2451 // so just return.
2452 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2453 JavaThread* thread = (JavaThread*) t;
2454 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2455 address addr = (address) exceptionRecord->ExceptionInformation[1];
2456 if (os::is_memory_serialize_page(thread, addr)) {
2457 // Block current thread until the memory serialize page permission restored.
2458 os::block_on_serialize_page_trap();
2459 return EXCEPTION_CONTINUE_EXECUTION;
2460 }
2461 }
2462
2463 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2464 VM_Version::is_cpuinfo_segv_addr(pc)) {
2465 // Verify that OS save/restore AVX registers.
2466 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2467 }
2468
2469 if (t != NULL && t->is_Java_thread()) {
2470 JavaThread* thread = (JavaThread*) t;
2471 bool in_java = thread->thread_state() == _thread_in_Java;
2472
2473 // Handle potential stack overflows up front.
2474 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2475 #ifdef _M_IA64
2476 // Use guard page for register stack.
2477 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2478 address addr = (address) exceptionRecord->ExceptionInformation[1];
2479 // Check for a register stack overflow on Itanium
2480 if (thread->addr_inside_register_stack_red_zone(addr)) {
2481 // Fatal red zone violation happens if the Java program
2482 // catches a StackOverflow error and does so much processing
2483 // that it runs beyond the unprotected yellow guard zone. As
2484 // a result, we are out of here.
2485 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2486 } else if(thread->addr_inside_register_stack(addr)) {
2487 // Disable the yellow zone which sets the state that
2488 // we've got a stack overflow problem.
2489 if (thread->stack_yellow_reserved_zone_enabled()) {
2490 thread->disable_stack_yellow_reserved_zone();
2491 }
2492 // Give us some room to process the exception.
2493 thread->disable_register_stack_guard();
2494 // Tracing with +Verbose.
2495 if (Verbose) {
2496 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2497 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2498 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2499 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2500 thread->register_stack_base(),
2501 thread->register_stack_base() + thread->stack_size());
2502 }
2503
2504 // Reguard the permanent register stack red zone just to be sure.
2505 // We saw Windows silently disabling this without telling us.
2506 thread->enable_register_stack_red_zone();
2507
2508 return Handle_Exception(exceptionInfo,
2509 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2510 }
2511 #endif
2512 if (thread->stack_guards_enabled()) {
2513 if (_thread_in_Java) {
2514 frame fr;
2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2516 address addr = (address) exceptionRecord->ExceptionInformation[1];
2517 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2518 assert(fr.is_java_frame(), "Must be a Java frame");
2519 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2520 }
2521 }
2522 // Yellow zone violation. The o/s has unprotected the first yellow
2523 // zone page for us. Note: must call disable_stack_yellow_zone to
2524 // update the enabled status, even if the zone contains only one page.
2525 thread->disable_stack_yellow_reserved_zone();
2526 // If not in java code, return and hope for the best.
2527 return in_java
2528 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2529 : EXCEPTION_CONTINUE_EXECUTION;
2530 } else {
2531 // Fatal red zone violation.
2532 thread->disable_stack_red_zone();
2533 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2534 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2535 exceptionInfo->ContextRecord);
2536 return EXCEPTION_CONTINUE_SEARCH;
2537 }
2538 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2539 // Either stack overflow or null pointer exception.
2540 if (in_java) {
2541 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2542 address addr = (address) exceptionRecord->ExceptionInformation[1];
2543 address stack_end = thread->stack_end();
2544 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2545 // Stack overflow.
2546 assert(!os::uses_stack_guard_pages(),
2547 "should be caught by red zone code above.");
2548 return Handle_Exception(exceptionInfo,
2549 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2550 }
2551 // Check for safepoint polling and implicit null
2552 // We only expect null pointers in the stubs (vtable)
2553 // the rest are checked explicitly now.
2554 CodeBlob* cb = CodeCache::find_blob(pc);
2555 if (cb != NULL) {
2556 if (os::is_poll_address(addr)) {
2557 address stub = SharedRuntime::get_poll_stub(pc);
2558 return Handle_Exception(exceptionInfo, stub);
2559 }
2560 }
2561 {
2562 #ifdef _WIN64
2563 // If it's a legal stack address map the entire region in
2564 //
2565 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2566 address addr = (address) exceptionRecord->ExceptionInformation[1];
2567 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2568 addr = (address)((uintptr_t)addr &
2569 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2570 os::commit_memory((char *)addr, thread->stack_base() - addr,
2571 !ExecMem);
2572 return EXCEPTION_CONTINUE_EXECUTION;
2573 } else
2574 #endif
2575 {
2576 // Null pointer exception.
2577 #ifdef _M_IA64
2578 // Process implicit null checks in compiled code. Note: Implicit null checks
2579 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2580 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2581 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2582 // Handle implicit null check in UEP method entry
2583 if (cb && (cb->is_frame_complete_at(pc) ||
2584 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2585 if (Verbose) {
2586 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2587 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2588 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2589 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2590 *(bundle_start + 1), *bundle_start);
2591 }
2592 return Handle_Exception(exceptionInfo,
2593 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2594 }
2595 }
2596
2597 // Implicit null checks were processed above. Hence, we should not reach
2598 // here in the usual case => die!
2599 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2600 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2601 exceptionInfo->ContextRecord);
2602 return EXCEPTION_CONTINUE_SEARCH;
2603
2604 #else // !IA64
2605
2606 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2607 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2608 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2609 }
2610 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2611 exceptionInfo->ContextRecord);
2612 return EXCEPTION_CONTINUE_SEARCH;
2613 #endif
2614 }
2615 }
2616 }
2617
2618 #ifdef _WIN64
2619 // Special care for fast JNI field accessors.
2620 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2621 // in and the heap gets shrunk before the field access.
2622 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2623 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2624 if (addr != (address)-1) {
2625 return Handle_Exception(exceptionInfo, addr);
2626 }
2627 }
2628 #endif
2629
2630 // Stack overflow or null pointer exception in native code.
2631 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2632 exceptionInfo->ContextRecord);
2633 return EXCEPTION_CONTINUE_SEARCH;
2634 } // /EXCEPTION_ACCESS_VIOLATION
2635 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2636 #if defined _M_IA64
2637 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2638 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2639 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2640
2641 // Compiled method patched to be non entrant? Following conditions must apply:
2642 // 1. must be first instruction in bundle
2643 // 2. must be a break instruction with appropriate code
2644 if ((((uint64_t) pc & 0x0F) == 0) &&
2645 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2646 return Handle_Exception(exceptionInfo,
2647 (address)SharedRuntime::get_handle_wrong_method_stub());
2648 }
2649 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2650 #endif
2651
2652
2653 if (in_java) {
2654 switch (exception_code) {
2655 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2656 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2657
2658 case EXCEPTION_INT_OVERFLOW:
2659 return Handle_IDiv_Exception(exceptionInfo);
2660
2661 } // switch
2662 }
2663 if (((thread->thread_state() == _thread_in_Java) ||
2664 (thread->thread_state() == _thread_in_native)) &&
2665 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2666 LONG result=Handle_FLT_Exception(exceptionInfo);
2667 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2668 }
2669 }
2670
2671 if (exception_code != EXCEPTION_BREAKPOINT) {
2672 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2673 exceptionInfo->ContextRecord);
2674 }
2675 return EXCEPTION_CONTINUE_SEARCH;
2676 }
2677
2678 #ifndef _WIN64
2679 // Special care for fast JNI accessors.
2680 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2681 // the heap gets shrunk before the field access.
2682 // Need to install our own structured exception handler since native code may
2683 // install its own.
2684 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2685 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2686 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2687 address pc = (address) exceptionInfo->ContextRecord->Eip;
2688 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2689 if (addr != (address)-1) {
2690 return Handle_Exception(exceptionInfo, addr);
2691 }
2692 }
2693 return EXCEPTION_CONTINUE_SEARCH;
2694 }
2695
2696 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2697 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2698 jobject obj, \
2699 jfieldID fieldID) { \
2700 __try { \
2701 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2702 obj, \
2703 fieldID); \
2704 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2705 _exception_info())) { \
2706 } \
2707 return 0; \
2708 }
2709
2710 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2711 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2712 DEFINE_FAST_GETFIELD(jchar, char, Char)
2713 DEFINE_FAST_GETFIELD(jshort, short, Short)
2714 DEFINE_FAST_GETFIELD(jint, int, Int)
2715 DEFINE_FAST_GETFIELD(jlong, long, Long)
2716 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2717 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2718
2719 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2720 switch (type) {
2721 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2722 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2723 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2724 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2725 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2726 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2727 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2728 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2729 default: ShouldNotReachHere();
2730 }
2731 return (address)-1;
2732 }
2733 #endif
2734
2735 // Virtual Memory
2736
2737 int os::vm_page_size() { return os::win32::vm_page_size(); }
2738 int os::vm_allocation_granularity() {
2739 return os::win32::vm_allocation_granularity();
2740 }
2741
2742 // Windows large page support is available on Windows 2003. In order to use
2743 // large page memory, the administrator must first assign additional privilege
2744 // to the user:
2745 // + select Control Panel -> Administrative Tools -> Local Security Policy
2746 // + select Local Policies -> User Rights Assignment
2747 // + double click "Lock pages in memory", add users and/or groups
2748 // + reboot
2749 // Note the above steps are needed for administrator as well, as administrators
2750 // by default do not have the privilege to lock pages in memory.
2751 //
2752 // Note about Windows 2003: although the API supports committing large page
2753 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2754 // scenario, I found through experiment it only uses large page if the entire
2755 // memory region is reserved and committed in a single VirtualAlloc() call.
2756 // This makes Windows large page support more or less like Solaris ISM, in
2757 // that the entire heap must be committed upfront. This probably will change
2758 // in the future, if so the code below needs to be revisited.
2759
2760 #ifndef MEM_LARGE_PAGES
2761 #define MEM_LARGE_PAGES 0x20000000
2762 #endif
2763
2764 static HANDLE _hProcess;
2765 static HANDLE _hToken;
2766
2767 // Container for NUMA node list info
2768 class NUMANodeListHolder {
2769 private:
2770 int *_numa_used_node_list; // allocated below
2771 int _numa_used_node_count;
2772
2773 void free_node_list() {
2774 if (_numa_used_node_list != NULL) {
2775 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2776 }
2777 }
2778
2779 public:
2780 NUMANodeListHolder() {
2781 _numa_used_node_count = 0;
2782 _numa_used_node_list = NULL;
2783 // do rest of initialization in build routine (after function pointers are set up)
2784 }
2785
2786 ~NUMANodeListHolder() {
2787 free_node_list();
2788 }
2789
2790 bool build() {
2791 DWORD_PTR proc_aff_mask;
2792 DWORD_PTR sys_aff_mask;
2793 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2794 ULONG highest_node_number;
2795 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2796 free_node_list();
2797 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2798 for (unsigned int i = 0; i <= highest_node_number; i++) {
2799 ULONGLONG proc_mask_numa_node;
2800 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2801 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2802 _numa_used_node_list[_numa_used_node_count++] = i;
2803 }
2804 }
2805 return (_numa_used_node_count > 1);
2806 }
2807
2808 int get_count() { return _numa_used_node_count; }
2809 int get_node_list_entry(int n) {
2810 // for indexes out of range, returns -1
2811 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2812 }
2813
2814 } numa_node_list_holder;
2815
2816
2817
2818 static size_t _large_page_size = 0;
2819
2820 static bool request_lock_memory_privilege() {
2821 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2822 os::current_process_id());
2823
2824 LUID luid;
2825 if (_hProcess != NULL &&
2826 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2827 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2828
2829 TOKEN_PRIVILEGES tp;
2830 tp.PrivilegeCount = 1;
2831 tp.Privileges[0].Luid = luid;
2832 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2833
2834 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2835 // privilege. Check GetLastError() too. See MSDN document.
2836 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2837 (GetLastError() == ERROR_SUCCESS)) {
2838 return true;
2839 }
2840 }
2841
2842 return false;
2843 }
2844
2845 static void cleanup_after_large_page_init() {
2846 if (_hProcess) CloseHandle(_hProcess);
2847 _hProcess = NULL;
2848 if (_hToken) CloseHandle(_hToken);
2849 _hToken = NULL;
2850 }
2851
2852 static bool numa_interleaving_init() {
2853 bool success = false;
2854 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2855
2856 // print a warning if UseNUMAInterleaving flag is specified on command line
2857 bool warn_on_failure = use_numa_interleaving_specified;
2858 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2859
2860 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2861 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2862 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2863
2864 if (numa_node_list_holder.build()) {
2865 if (PrintMiscellaneous && Verbose) {
2866 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2867 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2868 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2869 }
2870 tty->print("\n");
2871 }
2872 success = true;
2873 } else {
2874 WARN("Process does not cover multiple NUMA nodes.");
2875 }
2876 if (!success) {
2877 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2878 }
2879 return success;
2880 #undef WARN
2881 }
2882
2883 // this routine is used whenever we need to reserve a contiguous VA range
2884 // but we need to make separate VirtualAlloc calls for each piece of the range
2885 // Reasons for doing this:
2886 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2887 // * UseNUMAInterleaving requires a separate node for each piece
2888 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2889 DWORD prot,
2890 bool should_inject_error = false) {
2891 char * p_buf;
2892 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2893 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2894 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2895
2896 // first reserve enough address space in advance since we want to be
2897 // able to break a single contiguous virtual address range into multiple
2898 // large page commits but WS2003 does not allow reserving large page space
2899 // so we just use 4K pages for reserve, this gives us a legal contiguous
2900 // address space. then we will deallocate that reservation, and re alloc
2901 // using large pages
2902 const size_t size_of_reserve = bytes + chunk_size;
2903 if (bytes > size_of_reserve) {
2904 // Overflowed.
2905 return NULL;
2906 }
2907 p_buf = (char *) VirtualAlloc(addr,
2908 size_of_reserve, // size of Reserve
2909 MEM_RESERVE,
2910 PAGE_READWRITE);
2911 // If reservation failed, return NULL
2912 if (p_buf == NULL) return NULL;
2913 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2914 os::release_memory(p_buf, bytes + chunk_size);
2915
2916 // we still need to round up to a page boundary (in case we are using large pages)
2917 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2918 // instead we handle this in the bytes_to_rq computation below
2919 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2920
2921 // now go through and allocate one chunk at a time until all bytes are
2922 // allocated
2923 size_t bytes_remaining = bytes;
2924 // An overflow of align_size_up() would have been caught above
2925 // in the calculation of size_of_reserve.
2926 char * next_alloc_addr = p_buf;
2927 HANDLE hProc = GetCurrentProcess();
2928
2929 #ifdef ASSERT
2930 // Variable for the failure injection
2931 long ran_num = os::random();
2932 size_t fail_after = ran_num % bytes;
2933 #endif
2934
2935 int count=0;
2936 while (bytes_remaining) {
2937 // select bytes_to_rq to get to the next chunk_size boundary
2938
2939 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2940 // Note allocate and commit
2941 char * p_new;
2942
2943 #ifdef ASSERT
2944 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2945 #else
2946 const bool inject_error_now = false;
2947 #endif
2948
2949 if (inject_error_now) {
2950 p_new = NULL;
2951 } else {
2952 if (!UseNUMAInterleaving) {
2953 p_new = (char *) VirtualAlloc(next_alloc_addr,
2954 bytes_to_rq,
2955 flags,
2956 prot);
2957 } else {
2958 // get the next node to use from the used_node_list
2959 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2960 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2961 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2962 }
2963 }
2964
2965 if (p_new == NULL) {
2966 // Free any allocated pages
2967 if (next_alloc_addr > p_buf) {
2968 // Some memory was committed so release it.
2969 size_t bytes_to_release = bytes - bytes_remaining;
2970 // NMT has yet to record any individual blocks, so it
2971 // need to create a dummy 'reserve' record to match
2972 // the release.
2973 MemTracker::record_virtual_memory_reserve((address)p_buf,
2974 bytes_to_release, CALLER_PC);
2975 os::release_memory(p_buf, bytes_to_release);
2976 }
2977 #ifdef ASSERT
2978 if (should_inject_error) {
2979 if (TracePageSizes && Verbose) {
2980 tty->print_cr("Reserving pages individually failed.");
2981 }
2982 }
2983 #endif
2984 return NULL;
2985 }
2986
2987 bytes_remaining -= bytes_to_rq;
2988 next_alloc_addr += bytes_to_rq;
2989 count++;
2990 }
2991 // Although the memory is allocated individually, it is returned as one.
2992 // NMT records it as one block.
2993 if ((flags & MEM_COMMIT) != 0) {
2994 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2995 } else {
2996 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2997 }
2998
2999 // made it this far, success
3000 return p_buf;
3001 }
3002
3003
3004
3005 void os::large_page_init() {
3006 if (!UseLargePages) return;
3007
3008 // print a warning if any large page related flag is specified on command line
3009 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3010 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3011 bool success = false;
3012
3013 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3014 if (request_lock_memory_privilege()) {
3015 size_t s = GetLargePageMinimum();
3016 if (s) {
3017 #if defined(IA32) || defined(AMD64)
3018 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3019 WARN("JVM cannot use large pages bigger than 4mb.");
3020 } else {
3021 #endif
3022 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3023 _large_page_size = LargePageSizeInBytes;
3024 } else {
3025 _large_page_size = s;
3026 }
3027 success = true;
3028 #if defined(IA32) || defined(AMD64)
3029 }
3030 #endif
3031 } else {
3032 WARN("Large page is not supported by the processor.");
3033 }
3034 } else {
3035 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3036 }
3037 #undef WARN
3038
3039 const size_t default_page_size = (size_t) vm_page_size();
3040 if (success && _large_page_size > default_page_size) {
3041 _page_sizes[0] = _large_page_size;
3042 _page_sizes[1] = default_page_size;
3043 _page_sizes[2] = 0;
3044 }
3045
3046 cleanup_after_large_page_init();
3047 UseLargePages = success;
3048 }
3049
3050 // On win32, one cannot release just a part of reserved memory, it's an
3051 // all or nothing deal. When we split a reservation, we must break the
3052 // reservation into two reservations.
3053 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3054 bool realloc) {
3055 if (size > 0) {
3056 release_memory(base, size);
3057 if (realloc) {
3058 reserve_memory(split, base);
3059 }
3060 if (size != split) {
3061 reserve_memory(size - split, base + split);
3062 }
3063 }
3064 }
3065
3066 // Multiple threads can race in this code but it's not possible to unmap small sections of
3067 // virtual space to get requested alignment, like posix-like os's.
3068 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3069 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3070 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3071 "Alignment must be a multiple of allocation granularity (page size)");
3072 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3073
3074 size_t extra_size = size + alignment;
3075 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3076
3077 char* aligned_base = NULL;
3078
3079 do {
3080 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3081 if (extra_base == NULL) {
3082 return NULL;
3083 }
3084 // Do manual alignment
3085 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3086
3087 os::release_memory(extra_base, extra_size);
3088
3089 aligned_base = os::reserve_memory(size, aligned_base);
3090
3091 } while (aligned_base == NULL);
3092
3093 return aligned_base;
3094 }
3095
3096 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3097 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3098 "reserve alignment");
3099 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3100 char* res;
3101 // note that if UseLargePages is on, all the areas that require interleaving
3102 // will go thru reserve_memory_special rather than thru here.
3103 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3104 if (!use_individual) {
3105 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3106 } else {
3107 elapsedTimer reserveTimer;
3108 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3109 // in numa interleaving, we have to allocate pages individually
3110 // (well really chunks of NUMAInterleaveGranularity size)
3111 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3112 if (res == NULL) {
3113 warning("NUMA page allocation failed");
3114 }
3115 if (Verbose && PrintMiscellaneous) {
3116 reserveTimer.stop();
3117 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3118 reserveTimer.milliseconds(), reserveTimer.ticks());
3119 }
3120 }
3121 assert(res == NULL || addr == NULL || addr == res,
3122 "Unexpected address from reserve.");
3123
3124 return res;
3125 }
3126
3127 // Reserve memory at an arbitrary address, only if that area is
3128 // available (and not reserved for something else).
3129 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3130 // Windows os::reserve_memory() fails of the requested address range is
3131 // not avilable.
3132 return reserve_memory(bytes, requested_addr);
3133 }
3134
3135 size_t os::large_page_size() {
3136 return _large_page_size;
3137 }
3138
3139 bool os::can_commit_large_page_memory() {
3140 // Windows only uses large page memory when the entire region is reserved
3141 // and committed in a single VirtualAlloc() call. This may change in the
3142 // future, but with Windows 2003 it's not possible to commit on demand.
3143 return false;
3144 }
3145
3146 bool os::can_execute_large_page_memory() {
3147 return true;
3148 }
3149
3150 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3151 bool exec) {
3152 assert(UseLargePages, "only for large pages");
3153
3154 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3155 return NULL; // Fallback to small pages.
3156 }
3157
3158 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3159 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3160
3161 // with large pages, there are two cases where we need to use Individual Allocation
3162 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3163 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3164 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3165 if (TracePageSizes && Verbose) {
3166 tty->print_cr("Reserving large pages individually.");
3167 }
3168 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3169 if (p_buf == NULL) {
3170 // give an appropriate warning message
3171 if (UseNUMAInterleaving) {
3172 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3173 }
3174 if (UseLargePagesIndividualAllocation) {
3175 warning("Individually allocated large pages failed, "
3176 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3177 }
3178 return NULL;
3179 }
3180
3181 return p_buf;
3182
3183 } else {
3184 if (TracePageSizes && Verbose) {
3185 tty->print_cr("Reserving large pages in a single large chunk.");
3186 }
3187 // normal policy just allocate it all at once
3188 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3189 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3190 if (res != NULL) {
3191 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3192 }
3193
3194 return res;
3195 }
3196 }
3197
3198 bool os::release_memory_special(char* base, size_t bytes) {
3199 assert(base != NULL, "Sanity check");
3200 return release_memory(base, bytes);
3201 }
3202
3203 void os::print_statistics() {
3204 }
3205
3206 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3207 int err = os::get_last_error();
3208 char buf[256];
3209 size_t buf_len = os::lasterror(buf, sizeof(buf));
3210 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3211 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3212 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3213 }
3214
3215 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3216 if (bytes == 0) {
3217 // Don't bother the OS with noops.
3218 return true;
3219 }
3220 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3221 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3222 // Don't attempt to print anything if the OS call fails. We're
3223 // probably low on resources, so the print itself may cause crashes.
3224
3225 // unless we have NUMAInterleaving enabled, the range of a commit
3226 // is always within a reserve covered by a single VirtualAlloc
3227 // in that case we can just do a single commit for the requested size
3228 if (!UseNUMAInterleaving) {
3229 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3230 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3231 return false;
3232 }
3233 if (exec) {
3234 DWORD oldprot;
3235 // Windows doc says to use VirtualProtect to get execute permissions
3236 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3237 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3238 return false;
3239 }
3240 }
3241 return true;
3242 } else {
3243
3244 // when NUMAInterleaving is enabled, the commit might cover a range that
3245 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3246 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3247 // returns represents the number of bytes that can be committed in one step.
3248 size_t bytes_remaining = bytes;
3249 char * next_alloc_addr = addr;
3250 while (bytes_remaining > 0) {
3251 MEMORY_BASIC_INFORMATION alloc_info;
3252 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3253 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3254 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3255 PAGE_READWRITE) == NULL) {
3256 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3257 exec);)
3258 return false;
3259 }
3260 if (exec) {
3261 DWORD oldprot;
3262 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3263 PAGE_EXECUTE_READWRITE, &oldprot)) {
3264 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3265 exec);)
3266 return false;
3267 }
3268 }
3269 bytes_remaining -= bytes_to_rq;
3270 next_alloc_addr += bytes_to_rq;
3271 }
3272 }
3273 // if we made it this far, return true
3274 return true;
3275 }
3276
3277 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3278 bool exec) {
3279 // alignment_hint is ignored on this OS
3280 return pd_commit_memory(addr, size, exec);
3281 }
3282
3283 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3284 const char* mesg) {
3285 assert(mesg != NULL, "mesg must be specified");
3286 if (!pd_commit_memory(addr, size, exec)) {
3287 warn_fail_commit_memory(addr, size, exec);
3288 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3289 }
3290 }
3291
3292 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3293 size_t alignment_hint, bool exec,
3294 const char* mesg) {
3295 // alignment_hint is ignored on this OS
3296 pd_commit_memory_or_exit(addr, size, exec, mesg);
3297 }
3298
3299 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3300 if (bytes == 0) {
3301 // Don't bother the OS with noops.
3302 return true;
3303 }
3304 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3305 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3306 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3307 }
3308
3309 bool os::pd_release_memory(char* addr, size_t bytes) {
3310 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3311 }
3312
3313 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3314 return os::commit_memory(addr, size, !ExecMem);
3315 }
3316
3317 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3318 return os::uncommit_memory(addr, size);
3319 }
3320
3321 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3322 uint count = 0;
3323 bool ret = false;
3324 size_t bytes_remaining = bytes;
3325 char * next_protect_addr = addr;
3326
3327 // Use VirtualQuery() to get the chunk size.
3328 while (bytes_remaining) {
3329 MEMORY_BASIC_INFORMATION alloc_info;
3330 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3331 return false;
3332 }
3333
3334 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3335 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3336 // but we don't distinguish here as both cases are protected by same API.
3337 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3338 warning("Failed protecting pages individually for chunk #%u", count);
3339 if (!ret) {
3340 return false;
3341 }
3342
3343 bytes_remaining -= bytes_to_protect;
3344 next_protect_addr += bytes_to_protect;
3345 count++;
3346 }
3347 return ret;
3348 }
3349
3350 // Set protections specified
3351 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3352 bool is_committed) {
3353 unsigned int p = 0;
3354 switch (prot) {
3355 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3356 case MEM_PROT_READ: p = PAGE_READONLY; break;
3357 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3358 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3359 default:
3360 ShouldNotReachHere();
3361 }
3362
3363 DWORD old_status;
3364
3365 // Strange enough, but on Win32 one can change protection only for committed
3366 // memory, not a big deal anyway, as bytes less or equal than 64K
3367 if (!is_committed) {
3368 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3369 "cannot commit protection page");
3370 }
3371 // One cannot use os::guard_memory() here, as on Win32 guard page
3372 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3373 //
3374 // Pages in the region become guard pages. Any attempt to access a guard page
3375 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3376 // the guard page status. Guard pages thus act as a one-time access alarm.
3377 bool ret;
3378 if (UseNUMAInterleaving) {
3379 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3380 // so we must protect the chunks individually.
3381 ret = protect_pages_individually(addr, bytes, p, &old_status);
3382 } else {
3383 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3384 }
3385 #ifdef ASSERT
3386 if (!ret) {
3387 int err = os::get_last_error();
3388 char buf[256];
3389 size_t buf_len = os::lasterror(buf, sizeof(buf));
3390 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3391 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3392 buf_len != 0 ? buf : "<no_error_string>", err);
3393 }
3394 #endif
3395 return ret;
3396 }
3397
3398 bool os::guard_memory(char* addr, size_t bytes) {
3399 DWORD old_status;
3400 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3401 }
3402
3403 bool os::unguard_memory(char* addr, size_t bytes) {
3404 DWORD old_status;
3405 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3406 }
3407
3408 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3409 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3410 void os::numa_make_global(char *addr, size_t bytes) { }
3411 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3412 bool os::numa_topology_changed() { return false; }
3413 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3414 int os::numa_get_group_id() { return 0; }
3415 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3416 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3417 // Provide an answer for UMA systems
3418 ids[0] = 0;
3419 return 1;
3420 } else {
3421 // check for size bigger than actual groups_num
3422 size = MIN2(size, numa_get_groups_num());
3423 for (int i = 0; i < (int)size; i++) {
3424 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3425 }
3426 return size;
3427 }
3428 }
3429
3430 bool os::get_page_info(char *start, page_info* info) {
3431 return false;
3432 }
3433
3434 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3435 page_info* page_found) {
3436 return end;
3437 }
3438
3439 char* os::non_memory_address_word() {
3440 // Must never look like an address returned by reserve_memory,
3441 // even in its subfields (as defined by the CPU immediate fields,
3442 // if the CPU splits constants across multiple instructions).
3443 return (char*)-1;
3444 }
3445
3446 #define MAX_ERROR_COUNT 100
3447 #define SYS_THREAD_ERROR 0xffffffffUL
3448
3449 void os::pd_start_thread(Thread* thread) {
3450 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3451 // Returns previous suspend state:
3452 // 0: Thread was not suspended
3453 // 1: Thread is running now
3454 // >1: Thread is still suspended.
3455 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3456 }
3457
3458 class HighResolutionInterval : public CHeapObj<mtThread> {
3459 // The default timer resolution seems to be 10 milliseconds.
3460 // (Where is this written down?)
3461 // If someone wants to sleep for only a fraction of the default,
3462 // then we set the timer resolution down to 1 millisecond for
3463 // the duration of their interval.
3464 // We carefully set the resolution back, since otherwise we
3465 // seem to incur an overhead (3%?) that we don't need.
3466 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3467 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3468 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3469 // timeBeginPeriod() if the relative error exceeded some threshold.
3470 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3471 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3472 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3473 // resolution timers running.
3474 private:
3475 jlong resolution;
3476 public:
3477 HighResolutionInterval(jlong ms) {
3478 resolution = ms % 10L;
3479 if (resolution != 0) {
3480 MMRESULT result = timeBeginPeriod(1L);
3481 }
3482 }
3483 ~HighResolutionInterval() {
3484 if (resolution != 0) {
3485 MMRESULT result = timeEndPeriod(1L);
3486 }
3487 resolution = 0L;
3488 }
3489 };
3490
3491 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3492 jlong limit = (jlong) MAXDWORD;
3493
3494 while (ms > limit) {
3495 int res;
3496 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3497 return res;
3498 }
3499 ms -= limit;
3500 }
3501
3502 assert(thread == Thread::current(), "thread consistency check");
3503 OSThread* osthread = thread->osthread();
3504 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3505 int result;
3506 if (interruptable) {
3507 assert(thread->is_Java_thread(), "must be java thread");
3508 JavaThread *jt = (JavaThread *) thread;
3509 ThreadBlockInVM tbivm(jt);
3510
3511 jt->set_suspend_equivalent();
3512 // cleared by handle_special_suspend_equivalent_condition() or
3513 // java_suspend_self() via check_and_wait_while_suspended()
3514
3515 HANDLE events[1];
3516 events[0] = osthread->interrupt_event();
3517 HighResolutionInterval *phri=NULL;
3518 if (!ForceTimeHighResolution) {
3519 phri = new HighResolutionInterval(ms);
3520 }
3521 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3522 result = OS_TIMEOUT;
3523 } else {
3524 ResetEvent(osthread->interrupt_event());
3525 osthread->set_interrupted(false);
3526 result = OS_INTRPT;
3527 }
3528 delete phri; //if it is NULL, harmless
3529
3530 // were we externally suspended while we were waiting?
3531 jt->check_and_wait_while_suspended();
3532 } else {
3533 assert(!thread->is_Java_thread(), "must not be java thread");
3534 Sleep((long) ms);
3535 result = OS_TIMEOUT;
3536 }
3537 return result;
3538 }
3539
3540 // Short sleep, direct OS call.
3541 //
3542 // ms = 0, means allow others (if any) to run.
3543 //
3544 void os::naked_short_sleep(jlong ms) {
3545 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3546 Sleep(ms);
3547 }
3548
3549 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3550 void os::infinite_sleep() {
3551 while (true) { // sleep forever ...
3552 Sleep(100000); // ... 100 seconds at a time
3553 }
3554 }
3555
3556 typedef BOOL (WINAPI * STTSignature)(void);
3557
3558 void os::naked_yield() {
3559 // Consider passing back the return value from SwitchToThread().
3560 SwitchToThread();
3561 }
3562
3563 // Win32 only gives you access to seven real priorities at a time,
3564 // so we compress Java's ten down to seven. It would be better
3565 // if we dynamically adjusted relative priorities.
3566
3567 int os::java_to_os_priority[CriticalPriority + 1] = {
3568 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3569 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3570 THREAD_PRIORITY_LOWEST, // 2
3571 THREAD_PRIORITY_BELOW_NORMAL, // 3
3572 THREAD_PRIORITY_BELOW_NORMAL, // 4
3573 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3574 THREAD_PRIORITY_NORMAL, // 6
3575 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3576 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3577 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3578 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3579 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3580 };
3581
3582 int prio_policy1[CriticalPriority + 1] = {
3583 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3584 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3585 THREAD_PRIORITY_LOWEST, // 2
3586 THREAD_PRIORITY_BELOW_NORMAL, // 3
3587 THREAD_PRIORITY_BELOW_NORMAL, // 4
3588 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3589 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3590 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3591 THREAD_PRIORITY_HIGHEST, // 8
3592 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3593 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3594 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3595 };
3596
3597 static int prio_init() {
3598 // If ThreadPriorityPolicy is 1, switch tables
3599 if (ThreadPriorityPolicy == 1) {
3600 int i;
3601 for (i = 0; i < CriticalPriority + 1; i++) {
3602 os::java_to_os_priority[i] = prio_policy1[i];
3603 }
3604 }
3605 if (UseCriticalJavaThreadPriority) {
3606 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3607 }
3608 return 0;
3609 }
3610
3611 OSReturn os::set_native_priority(Thread* thread, int priority) {
3612 if (!UseThreadPriorities) return OS_OK;
3613 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3614 return ret ? OS_OK : OS_ERR;
3615 }
3616
3617 OSReturn os::get_native_priority(const Thread* const thread,
3618 int* priority_ptr) {
3619 if (!UseThreadPriorities) {
3620 *priority_ptr = java_to_os_priority[NormPriority];
3621 return OS_OK;
3622 }
3623 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3624 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3625 assert(false, "GetThreadPriority failed");
3626 return OS_ERR;
3627 }
3628 *priority_ptr = os_prio;
3629 return OS_OK;
3630 }
3631
3632
3633 // Hint to the underlying OS that a task switch would not be good.
3634 // Void return because it's a hint and can fail.
3635 void os::hint_no_preempt() {}
3636
3637 void os::interrupt(Thread* thread) {
3638 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3639 Threads_lock->owned_by_self(),
3640 "possibility of dangling Thread pointer");
3641
3642 OSThread* osthread = thread->osthread();
3643 osthread->set_interrupted(true);
3644 // More than one thread can get here with the same value of osthread,
3645 // resulting in multiple notifications. We do, however, want the store
3646 // to interrupted() to be visible to other threads before we post
3647 // the interrupt event.
3648 OrderAccess::release();
3649 SetEvent(osthread->interrupt_event());
3650 // For JSR166: unpark after setting status
3651 if (thread->is_Java_thread()) {
3652 ((JavaThread*)thread)->parker()->unpark();
3653 }
3654
3655 ParkEvent * ev = thread->_ParkEvent;
3656 if (ev != NULL) ev->unpark();
3657 }
3658
3659
3660 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3661 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3662 "possibility of dangling Thread pointer");
3663
3664 OSThread* osthread = thread->osthread();
3665 // There is no synchronization between the setting of the interrupt
3666 // and it being cleared here. It is critical - see 6535709 - that
3667 // we only clear the interrupt state, and reset the interrupt event,
3668 // if we are going to report that we were indeed interrupted - else
3669 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3670 // depending on the timing. By checking thread interrupt event to see
3671 // if the thread gets real interrupt thus prevent spurious wakeup.
3672 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3673 if (interrupted && clear_interrupted) {
3674 osthread->set_interrupted(false);
3675 ResetEvent(osthread->interrupt_event());
3676 } // Otherwise leave the interrupted state alone
3677
3678 return interrupted;
3679 }
3680
3681 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3682 ExtendedPC os::get_thread_pc(Thread* thread) {
3683 CONTEXT context;
3684 context.ContextFlags = CONTEXT_CONTROL;
3685 HANDLE handle = thread->osthread()->thread_handle();
3686 #ifdef _M_IA64
3687 assert(0, "Fix get_thread_pc");
3688 return ExtendedPC(NULL);
3689 #else
3690 if (GetThreadContext(handle, &context)) {
3691 #ifdef _M_AMD64
3692 return ExtendedPC((address) context.Rip);
3693 #else
3694 return ExtendedPC((address) context.Eip);
3695 #endif
3696 } else {
3697 return ExtendedPC(NULL);
3698 }
3699 #endif
3700 }
3701
3702 // GetCurrentThreadId() returns DWORD
3703 intx os::current_thread_id() { return GetCurrentThreadId(); }
3704
3705 static int _initial_pid = 0;
3706
3707 int os::current_process_id() {
3708 return (_initial_pid ? _initial_pid : _getpid());
3709 }
3710
3711 int os::win32::_vm_page_size = 0;
3712 int os::win32::_vm_allocation_granularity = 0;
3713 int os::win32::_processor_type = 0;
3714 // Processor level is not available on non-NT systems, use vm_version instead
3715 int os::win32::_processor_level = 0;
3716 julong os::win32::_physical_memory = 0;
3717 size_t os::win32::_default_stack_size = 0;
3718
3719 intx os::win32::_os_thread_limit = 0;
3720 volatile intx os::win32::_os_thread_count = 0;
3721
3722 bool os::win32::_is_windows_server = false;
3723
3724 // 6573254
3725 // Currently, the bug is observed across all the supported Windows releases,
3726 // including the latest one (as of this writing - Windows Server 2012 R2)
3727 bool os::win32::_has_exit_bug = true;
3728
3729 void os::win32::initialize_system_info() {
3730 SYSTEM_INFO si;
3731 GetSystemInfo(&si);
3732 _vm_page_size = si.dwPageSize;
3733 _vm_allocation_granularity = si.dwAllocationGranularity;
3734 _processor_type = si.dwProcessorType;
3735 _processor_level = si.wProcessorLevel;
3736 set_processor_count(si.dwNumberOfProcessors);
3737
3738 MEMORYSTATUSEX ms;
3739 ms.dwLength = sizeof(ms);
3740
3741 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3742 // dwMemoryLoad (% of memory in use)
3743 GlobalMemoryStatusEx(&ms);
3744 _physical_memory = ms.ullTotalPhys;
3745
3746 OSVERSIONINFOEX oi;
3747 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3748 GetVersionEx((OSVERSIONINFO*)&oi);
3749 switch (oi.dwPlatformId) {
3750 case VER_PLATFORM_WIN32_NT:
3751 {
3752 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3753 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3754 oi.wProductType == VER_NT_SERVER) {
3755 _is_windows_server = true;
3756 }
3757 }
3758 break;
3759 default: fatal("Unknown platform");
3760 }
3761
3762 _default_stack_size = os::current_stack_size();
3763 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3764 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3765 "stack size not a multiple of page size");
3766
3767 initialize_performance_counter();
3768 }
3769
3770
3771 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3772 int ebuflen) {
3773 char path[MAX_PATH];
3774 DWORD size;
3775 DWORD pathLen = (DWORD)sizeof(path);
3776 HINSTANCE result = NULL;
3777
3778 // only allow library name without path component
3779 assert(strchr(name, '\\') == NULL, "path not allowed");
3780 assert(strchr(name, ':') == NULL, "path not allowed");
3781 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3782 jio_snprintf(ebuf, ebuflen,
3783 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3784 return NULL;
3785 }
3786
3787 // search system directory
3788 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3789 if (size >= pathLen) {
3790 return NULL; // truncated
3791 }
3792 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3793 return NULL; // truncated
3794 }
3795 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3796 return result;
3797 }
3798 }
3799
3800 // try Windows directory
3801 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3802 if (size >= pathLen) {
3803 return NULL; // truncated
3804 }
3805 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3806 return NULL; // truncated
3807 }
3808 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3809 return result;
3810 }
3811 }
3812
3813 jio_snprintf(ebuf, ebuflen,
3814 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3815 return NULL;
3816 }
3817
3818 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3819 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3820
3821 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3822 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3823 return TRUE;
3824 }
3825
3826 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3827 // Basic approach:
3828 // - Each exiting thread registers its intent to exit and then does so.
3829 // - A thread trying to terminate the process must wait for all
3830 // threads currently exiting to complete their exit.
3831
3832 if (os::win32::has_exit_bug()) {
3833 // The array holds handles of the threads that have started exiting by calling
3834 // _endthreadex().
3835 // Should be large enough to avoid blocking the exiting thread due to lack of
3836 // a free slot.
3837 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3838 static int handle_count = 0;
3839
3840 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3841 static CRITICAL_SECTION crit_sect;
3842 static volatile jint process_exiting = 0;
3843 int i, j;
3844 DWORD res;
3845 HANDLE hproc, hthr;
3846
3847 // The first thread that reached this point, initializes the critical section.
3848 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3849 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3850 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3851 if (what != EPT_THREAD) {
3852 // Atomically set process_exiting before the critical section
3853 // to increase the visibility between racing threads.
3854 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3855 }
3856 EnterCriticalSection(&crit_sect);
3857
3858 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3859 // Remove from the array those handles of the threads that have completed exiting.
3860 for (i = 0, j = 0; i < handle_count; ++i) {
3861 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3862 if (res == WAIT_TIMEOUT) {
3863 handles[j++] = handles[i];
3864 } else {
3865 if (res == WAIT_FAILED) {
3866 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3867 GetLastError(), __FILE__, __LINE__);
3868 }
3869 // Don't keep the handle, if we failed waiting for it.
3870 CloseHandle(handles[i]);
3871 }
3872 }
3873
3874 // If there's no free slot in the array of the kept handles, we'll have to
3875 // wait until at least one thread completes exiting.
3876 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3877 // Raise the priority of the oldest exiting thread to increase its chances
3878 // to complete sooner.
3879 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3880 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3881 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3882 i = (res - WAIT_OBJECT_0);
3883 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3884 for (; i < handle_count; ++i) {
3885 handles[i] = handles[i + 1];
3886 }
3887 } else {
3888 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3889 (res == WAIT_FAILED ? "failed" : "timed out"),
3890 GetLastError(), __FILE__, __LINE__);
3891 // Don't keep handles, if we failed waiting for them.
3892 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3893 CloseHandle(handles[i]);
3894 }
3895 handle_count = 0;
3896 }
3897 }
3898
3899 // Store a duplicate of the current thread handle in the array of handles.
3900 hproc = GetCurrentProcess();
3901 hthr = GetCurrentThread();
3902 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3903 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3904 warning("DuplicateHandle failed (%u) in %s: %d\n",
3905 GetLastError(), __FILE__, __LINE__);
3906 } else {
3907 ++handle_count;
3908 }
3909
3910 // The current exiting thread has stored its handle in the array, and now
3911 // should leave the critical section before calling _endthreadex().
3912
3913 } else if (what != EPT_THREAD && handle_count > 0) {
3914 jlong start_time, finish_time, timeout_left;
3915 // Before ending the process, make sure all the threads that had called
3916 // _endthreadex() completed.
3917
3918 // Set the priority level of the current thread to the same value as
3919 // the priority level of exiting threads.
3920 // This is to ensure it will be given a fair chance to execute if
3921 // the timeout expires.
3922 hthr = GetCurrentThread();
3923 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3924 start_time = os::javaTimeNanos();
3925 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3926 for (i = 0; ; ) {
3927 int portion_count = handle_count - i;
3928 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3929 portion_count = MAXIMUM_WAIT_OBJECTS;
3930 }
3931 for (j = 0; j < portion_count; ++j) {
3932 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3933 }
3934 timeout_left = (finish_time - start_time) / 1000000L;
3935 if (timeout_left < 0) {
3936 timeout_left = 0;
3937 }
3938 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3939 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3940 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3941 (res == WAIT_FAILED ? "failed" : "timed out"),
3942 GetLastError(), __FILE__, __LINE__);
3943 // Reset portion_count so we close the remaining
3944 // handles due to this error.
3945 portion_count = handle_count - i;
3946 }
3947 for (j = 0; j < portion_count; ++j) {
3948 CloseHandle(handles[i + j]);
3949 }
3950 if ((i += portion_count) >= handle_count) {
3951 break;
3952 }
3953 start_time = os::javaTimeNanos();
3954 }
3955 handle_count = 0;
3956 }
3957
3958 LeaveCriticalSection(&crit_sect);
3959 }
3960
3961 if (OrderAccess::load_acquire(&process_exiting) != 0 &&
3962 process_exiting != (jint)GetCurrentThreadId()) {
3963 // Some other thread is about to call exit(), so we
3964 // don't let the current thread proceed to exit() or _endthreadex()
3965 while (true) {
3966 SuspendThread(GetCurrentThread());
3967 // Avoid busy-wait loop, if SuspendThread() failed.
3968 Sleep(EXIT_TIMEOUT);
3969 }
3970 }
3971 }
3972
3973 // We are here if either
3974 // - there's no 'race at exit' bug on this OS release;
3975 // - initialization of the critical section failed (unlikely);
3976 // - the current thread has stored its handle and left the critical section;
3977 // - the process-exiting thread has raised the flag and left the critical section.
3978 if (what == EPT_THREAD) {
3979 _endthreadex((unsigned)exit_code);
3980 } else if (what == EPT_PROCESS) {
3981 ::exit(exit_code);
3982 } else {
3983 _exit(exit_code);
3984 }
3985
3986 // Should not reach here
3987 return exit_code;
3988 }
3989
3990 #undef EXIT_TIMEOUT
3991
3992 void os::win32::setmode_streams() {
3993 _setmode(_fileno(stdin), _O_BINARY);
3994 _setmode(_fileno(stdout), _O_BINARY);
3995 _setmode(_fileno(stderr), _O_BINARY);
3996 }
3997
3998
3999 bool os::is_debugger_attached() {
4000 return IsDebuggerPresent() ? true : false;
4001 }
4002
4003
4004 void os::wait_for_keypress_at_exit(void) {
4005 if (PauseAtExit) {
4006 fprintf(stderr, "Press any key to continue...\n");
4007 fgetc(stdin);
4008 }
4009 }
4010
4011
4012 bool os::message_box(const char* title, const char* message) {
4013 int result = MessageBox(NULL, message, title,
4014 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4015 return result == IDYES;
4016 }
4017
4018 #ifndef PRODUCT
4019 #ifndef _WIN64
4020 // Helpers to check whether NX protection is enabled
4021 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4022 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4023 pex->ExceptionRecord->NumberParameters > 0 &&
4024 pex->ExceptionRecord->ExceptionInformation[0] ==
4025 EXCEPTION_INFO_EXEC_VIOLATION) {
4026 return EXCEPTION_EXECUTE_HANDLER;
4027 }
4028 return EXCEPTION_CONTINUE_SEARCH;
4029 }
4030
4031 void nx_check_protection() {
4032 // If NX is enabled we'll get an exception calling into code on the stack
4033 char code[] = { (char)0xC3 }; // ret
4034 void *code_ptr = (void *)code;
4035 __try {
4036 __asm call code_ptr
4037 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4038 tty->print_raw_cr("NX protection detected.");
4039 }
4040 }
4041 #endif // _WIN64
4042 #endif // PRODUCT
4043
4044 // This is called _before_ the global arguments have been parsed
4045 void os::init(void) {
4046 _initial_pid = _getpid();
4047
4048 init_random(1234567);
4049
4050 win32::initialize_system_info();
4051 win32::setmode_streams();
4052 init_page_sizes((size_t) win32::vm_page_size());
4053
4054 // This may be overridden later when argument processing is done.
4055 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4056
4057 // Initialize main_process and main_thread
4058 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4059 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4060 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4061 fatal("DuplicateHandle failed\n");
4062 }
4063 main_thread_id = (int) GetCurrentThreadId();
4064
4065 // initialize fast thread access - only used for 32-bit
4066 win32::initialize_thread_ptr_offset();
4067 }
4068
4069 // To install functions for atexit processing
4070 extern "C" {
4071 static void perfMemory_exit_helper() {
4072 perfMemory_exit();
4073 }
4074 }
4075
4076 static jint initSock();
4077
4078 // this is called _after_ the global arguments have been parsed
4079 jint os::init_2(void) {
4080 // Allocate a single page and mark it as readable for safepoint polling
4081 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4082 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4083
4084 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4085 guarantee(return_page != NULL, "Commit Failed for polling page");
4086
4087 os::set_polling_page(polling_page);
4088
4089 #ifndef PRODUCT
4090 if (Verbose && PrintMiscellaneous) {
4091 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4092 (intptr_t)polling_page);
4093 }
4094 #endif
4095
4096 if (!UseMembar) {
4097 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4098 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4099
4100 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4101 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4102
4103 os::set_memory_serialize_page(mem_serialize_page);
4104
4105 #ifndef PRODUCT
4106 if (Verbose && PrintMiscellaneous) {
4107 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4108 (intptr_t)mem_serialize_page);
4109 }
4110 #endif
4111 }
4112
4113 // Setup Windows Exceptions
4114
4115 // for debugging float code generation bugs
4116 if (ForceFloatExceptions) {
4117 #ifndef _WIN64
4118 static long fp_control_word = 0;
4119 __asm { fstcw fp_control_word }
4120 // see Intel PPro Manual, Vol. 2, p 7-16
4121 const long precision = 0x20;
4122 const long underflow = 0x10;
4123 const long overflow = 0x08;
4124 const long zero_div = 0x04;
4125 const long denorm = 0x02;
4126 const long invalid = 0x01;
4127 fp_control_word |= invalid;
4128 __asm { fldcw fp_control_word }
4129 #endif
4130 }
4131
4132 // If stack_commit_size is 0, windows will reserve the default size,
4133 // but only commit a small portion of it.
4134 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4135 size_t default_reserve_size = os::win32::default_stack_size();
4136 size_t actual_reserve_size = stack_commit_size;
4137 if (stack_commit_size < default_reserve_size) {
4138 // If stack_commit_size == 0, we want this too
4139 actual_reserve_size = default_reserve_size;
4140 }
4141
4142 // Check minimum allowable stack size for thread creation and to initialize
4143 // the java system classes, including StackOverflowError - depends on page
4144 // size. Add a page for compiler2 recursion in main thread.
4145 // Add in 2*BytesPerWord times page size to account for VM stack during
4146 // class initialization depending on 32 or 64 bit VM.
4147 size_t min_stack_allowed =
4148 (size_t)(JavaThread::stack_yellow_zone_size() + JavaThread::stack_red_zone_size() +
4149 JavaThread::stack_shadow_zone_size() +
4150 (2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size());
4151 if (actual_reserve_size < min_stack_allowed) {
4152 tty->print_cr("\nThe stack size specified is too small, "
4153 "Specify at least %dk",
4154 min_stack_allowed / K);
4155 return JNI_ERR;
4156 }
4157
4158 JavaThread::set_stack_size_at_create(stack_commit_size);
4159
4160 // Calculate theoretical max. size of Threads to guard gainst artifical
4161 // out-of-memory situations, where all available address-space has been
4162 // reserved by thread stacks.
4163 assert(actual_reserve_size != 0, "Must have a stack");
4164
4165 // Calculate the thread limit when we should start doing Virtual Memory
4166 // banging. Currently when the threads will have used all but 200Mb of space.
4167 //
4168 // TODO: consider performing a similar calculation for commit size instead
4169 // as reserve size, since on a 64-bit platform we'll run into that more
4170 // often than running out of virtual memory space. We can use the
4171 // lower value of the two calculations as the os_thread_limit.
4172 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4173 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4174
4175 // at exit methods are called in the reverse order of their registration.
4176 // there is no limit to the number of functions registered. atexit does
4177 // not set errno.
4178
4179 if (PerfAllowAtExitRegistration) {
4180 // only register atexit functions if PerfAllowAtExitRegistration is set.
4181 // atexit functions can be delayed until process exit time, which
4182 // can be problematic for embedded VM situations. Embedded VMs should
4183 // call DestroyJavaVM() to assure that VM resources are released.
4184
4185 // note: perfMemory_exit_helper atexit function may be removed in
4186 // the future if the appropriate cleanup code can be added to the
4187 // VM_Exit VMOperation's doit method.
4188 if (atexit(perfMemory_exit_helper) != 0) {
4189 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4190 }
4191 }
4192
4193 #ifndef _WIN64
4194 // Print something if NX is enabled (win32 on AMD64)
4195 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4196 #endif
4197
4198 // initialize thread priority policy
4199 prio_init();
4200
4201 if (UseNUMA && !ForceNUMA) {
4202 UseNUMA = false; // We don't fully support this yet
4203 }
4204
4205 if (UseNUMAInterleaving) {
4206 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4207 bool success = numa_interleaving_init();
4208 if (!success) UseNUMAInterleaving = false;
4209 }
4210
4211 if (initSock() != JNI_OK) {
4212 return JNI_ERR;
4213 }
4214
4215 return JNI_OK;
4216 }
4217
4218 // Mark the polling page as unreadable
4219 void os::make_polling_page_unreadable(void) {
4220 DWORD old_status;
4221 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4222 PAGE_NOACCESS, &old_status)) {
4223 fatal("Could not disable polling page");
4224 }
4225 }
4226
4227 // Mark the polling page as readable
4228 void os::make_polling_page_readable(void) {
4229 DWORD old_status;
4230 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4231 PAGE_READONLY, &old_status)) {
4232 fatal("Could not enable polling page");
4233 }
4234 }
4235
4236
4237 int os::stat(const char *path, struct stat *sbuf) {
4238 char pathbuf[MAX_PATH];
4239 if (strlen(path) > MAX_PATH - 1) {
4240 errno = ENAMETOOLONG;
4241 return -1;
4242 }
4243 os::native_path(strcpy(pathbuf, path));
4244 int ret = ::stat(pathbuf, sbuf);
4245 if (sbuf != NULL && UseUTCFileTimestamp) {
4246 // Fix for 6539723. st_mtime returned from stat() is dependent on
4247 // the system timezone and so can return different values for the
4248 // same file if/when daylight savings time changes. This adjustment
4249 // makes sure the same timestamp is returned regardless of the TZ.
4250 //
4251 // See:
4252 // http://msdn.microsoft.com/library/
4253 // default.asp?url=/library/en-us/sysinfo/base/
4254 // time_zone_information_str.asp
4255 // and
4256 // http://msdn.microsoft.com/library/default.asp?url=
4257 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4258 //
4259 // NOTE: there is a insidious bug here: If the timezone is changed
4260 // after the call to stat() but before 'GetTimeZoneInformation()', then
4261 // the adjustment we do here will be wrong and we'll return the wrong
4262 // value (which will likely end up creating an invalid class data
4263 // archive). Absent a better API for this, or some time zone locking
4264 // mechanism, we'll have to live with this risk.
4265 TIME_ZONE_INFORMATION tz;
4266 DWORD tzid = GetTimeZoneInformation(&tz);
4267 int daylightBias =
4268 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4269 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4270 }
4271 return ret;
4272 }
4273
4274
4275 #define FT2INT64(ft) \
4276 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4277
4278
4279 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4280 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4281 // of a thread.
4282 //
4283 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4284 // the fast estimate available on the platform.
4285
4286 // current_thread_cpu_time() is not optimized for Windows yet
4287 jlong os::current_thread_cpu_time() {
4288 // return user + sys since the cost is the same
4289 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4290 }
4291
4292 jlong os::thread_cpu_time(Thread* thread) {
4293 // consistent with what current_thread_cpu_time() returns.
4294 return os::thread_cpu_time(thread, true /* user+sys */);
4295 }
4296
4297 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4298 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4299 }
4300
4301 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4302 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4303 // If this function changes, os::is_thread_cpu_time_supported() should too
4304 FILETIME CreationTime;
4305 FILETIME ExitTime;
4306 FILETIME KernelTime;
4307 FILETIME UserTime;
4308
4309 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4310 &ExitTime, &KernelTime, &UserTime) == 0) {
4311 return -1;
4312 } else if (user_sys_cpu_time) {
4313 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4314 } else {
4315 return FT2INT64(UserTime) * 100;
4316 }
4317 }
4318
4319 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4320 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4321 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4322 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4323 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4324 }
4325
4326 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4327 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4328 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4329 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4330 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4331 }
4332
4333 bool os::is_thread_cpu_time_supported() {
4334 // see os::thread_cpu_time
4335 FILETIME CreationTime;
4336 FILETIME ExitTime;
4337 FILETIME KernelTime;
4338 FILETIME UserTime;
4339
4340 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4341 &KernelTime, &UserTime) == 0) {
4342 return false;
4343 } else {
4344 return true;
4345 }
4346 }
4347
4348 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4349 // It does have primitives (PDH API) to get CPU usage and run queue length.
4350 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4351 // If we wanted to implement loadavg on Windows, we have a few options:
4352 //
4353 // a) Query CPU usage and run queue length and "fake" an answer by
4354 // returning the CPU usage if it's under 100%, and the run queue
4355 // length otherwise. It turns out that querying is pretty slow
4356 // on Windows, on the order of 200 microseconds on a fast machine.
4357 // Note that on the Windows the CPU usage value is the % usage
4358 // since the last time the API was called (and the first call
4359 // returns 100%), so we'd have to deal with that as well.
4360 //
4361 // b) Sample the "fake" answer using a sampling thread and store
4362 // the answer in a global variable. The call to loadavg would
4363 // just return the value of the global, avoiding the slow query.
4364 //
4365 // c) Sample a better answer using exponential decay to smooth the
4366 // value. This is basically the algorithm used by UNIX kernels.
4367 //
4368 // Note that sampling thread starvation could affect both (b) and (c).
4369 int os::loadavg(double loadavg[], int nelem) {
4370 return -1;
4371 }
4372
4373
4374 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4375 bool os::dont_yield() {
4376 return DontYieldALot;
4377 }
4378
4379 // This method is a slightly reworked copy of JDK's sysOpen
4380 // from src/windows/hpi/src/sys_api_md.c
4381
4382 int os::open(const char *path, int oflag, int mode) {
4383 char pathbuf[MAX_PATH];
4384
4385 if (strlen(path) > MAX_PATH - 1) {
4386 errno = ENAMETOOLONG;
4387 return -1;
4388 }
4389 os::native_path(strcpy(pathbuf, path));
4390 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4391 }
4392
4393 FILE* os::open(int fd, const char* mode) {
4394 return ::_fdopen(fd, mode);
4395 }
4396
4397 // Is a (classpath) directory empty?
4398 bool os::dir_is_empty(const char* path) {
4399 WIN32_FIND_DATA fd;
4400 HANDLE f = FindFirstFile(path, &fd);
4401 if (f == INVALID_HANDLE_VALUE) {
4402 return true;
4403 }
4404 FindClose(f);
4405 return false;
4406 }
4407
4408 // create binary file, rewriting existing file if required
4409 int os::create_binary_file(const char* path, bool rewrite_existing) {
4410 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4411 if (!rewrite_existing) {
4412 oflags |= _O_EXCL;
4413 }
4414 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4415 }
4416
4417 // return current position of file pointer
4418 jlong os::current_file_offset(int fd) {
4419 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4420 }
4421
4422 // move file pointer to the specified offset
4423 jlong os::seek_to_file_offset(int fd, jlong offset) {
4424 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4425 }
4426
4427
4428 jlong os::lseek(int fd, jlong offset, int whence) {
4429 return (jlong) ::_lseeki64(fd, offset, whence);
4430 }
4431
4432 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4433 OVERLAPPED ov;
4434 DWORD nread;
4435 BOOL result;
4436
4437 ZeroMemory(&ov, sizeof(ov));
4438 ov.Offset = (DWORD)offset;
4439 ov.OffsetHigh = (DWORD)(offset >> 32);
4440
4441 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4442
4443 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4444
4445 return result ? nread : 0;
4446 }
4447
4448
4449 // This method is a slightly reworked copy of JDK's sysNativePath
4450 // from src/windows/hpi/src/path_md.c
4451
4452 // Convert a pathname to native format. On win32, this involves forcing all
4453 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4454 // sometimes rejects '/') and removing redundant separators. The input path is
4455 // assumed to have been converted into the character encoding used by the local
4456 // system. Because this might be a double-byte encoding, care is taken to
4457 // treat double-byte lead characters correctly.
4458 //
4459 // This procedure modifies the given path in place, as the result is never
4460 // longer than the original. There is no error return; this operation always
4461 // succeeds.
4462 char * os::native_path(char *path) {
4463 char *src = path, *dst = path, *end = path;
4464 char *colon = NULL; // If a drive specifier is found, this will
4465 // point to the colon following the drive letter
4466
4467 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4468 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4469 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4470
4471 // Check for leading separators
4472 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4473 while (isfilesep(*src)) {
4474 src++;
4475 }
4476
4477 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4478 // Remove leading separators if followed by drive specifier. This
4479 // hack is necessary to support file URLs containing drive
4480 // specifiers (e.g., "file://c:/path"). As a side effect,
4481 // "/c:/path" can be used as an alternative to "c:/path".
4482 *dst++ = *src++;
4483 colon = dst;
4484 *dst++ = ':';
4485 src++;
4486 } else {
4487 src = path;
4488 if (isfilesep(src[0]) && isfilesep(src[1])) {
4489 // UNC pathname: Retain first separator; leave src pointed at
4490 // second separator so that further separators will be collapsed
4491 // into the second separator. The result will be a pathname
4492 // beginning with "\\\\" followed (most likely) by a host name.
4493 src = dst = path + 1;
4494 path[0] = '\\'; // Force first separator to '\\'
4495 }
4496 }
4497
4498 end = dst;
4499
4500 // Remove redundant separators from remainder of path, forcing all
4501 // separators to be '\\' rather than '/'. Also, single byte space
4502 // characters are removed from the end of the path because those
4503 // are not legal ending characters on this operating system.
4504 //
4505 while (*src != '\0') {
4506 if (isfilesep(*src)) {
4507 *dst++ = '\\'; src++;
4508 while (isfilesep(*src)) src++;
4509 if (*src == '\0') {
4510 // Check for trailing separator
4511 end = dst;
4512 if (colon == dst - 2) break; // "z:\\"
4513 if (dst == path + 1) break; // "\\"
4514 if (dst == path + 2 && isfilesep(path[0])) {
4515 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4516 // beginning of a UNC pathname. Even though it is not, by
4517 // itself, a valid UNC pathname, we leave it as is in order
4518 // to be consistent with the path canonicalizer as well
4519 // as the win32 APIs, which treat this case as an invalid
4520 // UNC pathname rather than as an alias for the root
4521 // directory of the current drive.
4522 break;
4523 }
4524 end = --dst; // Path does not denote a root directory, so
4525 // remove trailing separator
4526 break;
4527 }
4528 end = dst;
4529 } else {
4530 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4531 *dst++ = *src++;
4532 if (*src) *dst++ = *src++;
4533 end = dst;
4534 } else { // Copy a single-byte character
4535 char c = *src++;
4536 *dst++ = c;
4537 // Space is not a legal ending character
4538 if (c != ' ') end = dst;
4539 }
4540 }
4541 }
4542
4543 *end = '\0';
4544
4545 // For "z:", add "." to work around a bug in the C runtime library
4546 if (colon == dst - 1) {
4547 path[2] = '.';
4548 path[3] = '\0';
4549 }
4550
4551 return path;
4552 }
4553
4554 // This code is a copy of JDK's sysSetLength
4555 // from src/windows/hpi/src/sys_api_md.c
4556
4557 int os::ftruncate(int fd, jlong length) {
4558 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4559 long high = (long)(length >> 32);
4560 DWORD ret;
4561
4562 if (h == (HANDLE)(-1)) {
4563 return -1;
4564 }
4565
4566 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4567 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4568 return -1;
4569 }
4570
4571 if (::SetEndOfFile(h) == FALSE) {
4572 return -1;
4573 }
4574
4575 return 0;
4576 }
4577
4578
4579 // This code is a copy of JDK's sysSync
4580 // from src/windows/hpi/src/sys_api_md.c
4581 // except for the legacy workaround for a bug in Win 98
4582
4583 int os::fsync(int fd) {
4584 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4585
4586 if ((!::FlushFileBuffers(handle)) &&
4587 (GetLastError() != ERROR_ACCESS_DENIED)) {
4588 // from winerror.h
4589 return -1;
4590 }
4591 return 0;
4592 }
4593
4594 static int nonSeekAvailable(int, long *);
4595 static int stdinAvailable(int, long *);
4596
4597 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4598 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4599
4600 // This code is a copy of JDK's sysAvailable
4601 // from src/windows/hpi/src/sys_api_md.c
4602
4603 int os::available(int fd, jlong *bytes) {
4604 jlong cur, end;
4605 struct _stati64 stbuf64;
4606
4607 if (::_fstati64(fd, &stbuf64) >= 0) {
4608 int mode = stbuf64.st_mode;
4609 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4610 int ret;
4611 long lpbytes;
4612 if (fd == 0) {
4613 ret = stdinAvailable(fd, &lpbytes);
4614 } else {
4615 ret = nonSeekAvailable(fd, &lpbytes);
4616 }
4617 (*bytes) = (jlong)(lpbytes);
4618 return ret;
4619 }
4620 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4621 return FALSE;
4622 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4623 return FALSE;
4624 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4625 return FALSE;
4626 }
4627 *bytes = end - cur;
4628 return TRUE;
4629 } else {
4630 return FALSE;
4631 }
4632 }
4633
4634 // This code is a copy of JDK's nonSeekAvailable
4635 // from src/windows/hpi/src/sys_api_md.c
4636
4637 static int nonSeekAvailable(int fd, long *pbytes) {
4638 // This is used for available on non-seekable devices
4639 // (like both named and anonymous pipes, such as pipes
4640 // connected to an exec'd process).
4641 // Standard Input is a special case.
4642 HANDLE han;
4643
4644 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4645 return FALSE;
4646 }
4647
4648 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4649 // PeekNamedPipe fails when at EOF. In that case we
4650 // simply make *pbytes = 0 which is consistent with the
4651 // behavior we get on Solaris when an fd is at EOF.
4652 // The only alternative is to raise an Exception,
4653 // which isn't really warranted.
4654 //
4655 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4656 return FALSE;
4657 }
4658 *pbytes = 0;
4659 }
4660 return TRUE;
4661 }
4662
4663 #define MAX_INPUT_EVENTS 2000
4664
4665 // This code is a copy of JDK's stdinAvailable
4666 // from src/windows/hpi/src/sys_api_md.c
4667
4668 static int stdinAvailable(int fd, long *pbytes) {
4669 HANDLE han;
4670 DWORD numEventsRead = 0; // Number of events read from buffer
4671 DWORD numEvents = 0; // Number of events in buffer
4672 DWORD i = 0; // Loop index
4673 DWORD curLength = 0; // Position marker
4674 DWORD actualLength = 0; // Number of bytes readable
4675 BOOL error = FALSE; // Error holder
4676 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4677
4678 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4679 return FALSE;
4680 }
4681
4682 // Construct an array of input records in the console buffer
4683 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4684 if (error == 0) {
4685 return nonSeekAvailable(fd, pbytes);
4686 }
4687
4688 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4689 if (numEvents > MAX_INPUT_EVENTS) {
4690 numEvents = MAX_INPUT_EVENTS;
4691 }
4692
4693 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4694 if (lpBuffer == NULL) {
4695 return FALSE;
4696 }
4697
4698 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4699 if (error == 0) {
4700 os::free(lpBuffer);
4701 return FALSE;
4702 }
4703
4704 // Examine input records for the number of bytes available
4705 for (i=0; i<numEvents; i++) {
4706 if (lpBuffer[i].EventType == KEY_EVENT) {
4707
4708 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4709 &(lpBuffer[i].Event);
4710 if (keyRecord->bKeyDown == TRUE) {
4711 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4712 curLength++;
4713 if (*keyPressed == '\r') {
4714 actualLength = curLength;
4715 }
4716 }
4717 }
4718 }
4719
4720 if (lpBuffer != NULL) {
4721 os::free(lpBuffer);
4722 }
4723
4724 *pbytes = (long) actualLength;
4725 return TRUE;
4726 }
4727
4728 // Map a block of memory.
4729 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4730 char *addr, size_t bytes, bool read_only,
4731 bool allow_exec) {
4732 HANDLE hFile;
4733 char* base;
4734
4735 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4736 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4737 if (hFile == NULL) {
4738 if (PrintMiscellaneous && Verbose) {
4739 DWORD err = GetLastError();
4740 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4741 }
4742 return NULL;
4743 }
4744
4745 if (allow_exec) {
4746 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4747 // unless it comes from a PE image (which the shared archive is not.)
4748 // Even VirtualProtect refuses to give execute access to mapped memory
4749 // that was not previously executable.
4750 //
4751 // Instead, stick the executable region in anonymous memory. Yuck.
4752 // Penalty is that ~4 pages will not be shareable - in the future
4753 // we might consider DLLizing the shared archive with a proper PE
4754 // header so that mapping executable + sharing is possible.
4755
4756 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4757 PAGE_READWRITE);
4758 if (base == NULL) {
4759 if (PrintMiscellaneous && Verbose) {
4760 DWORD err = GetLastError();
4761 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4762 }
4763 CloseHandle(hFile);
4764 return NULL;
4765 }
4766
4767 DWORD bytes_read;
4768 OVERLAPPED overlapped;
4769 overlapped.Offset = (DWORD)file_offset;
4770 overlapped.OffsetHigh = 0;
4771 overlapped.hEvent = NULL;
4772 // ReadFile guarantees that if the return value is true, the requested
4773 // number of bytes were read before returning.
4774 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4775 if (!res) {
4776 if (PrintMiscellaneous && Verbose) {
4777 DWORD err = GetLastError();
4778 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4779 }
4780 release_memory(base, bytes);
4781 CloseHandle(hFile);
4782 return NULL;
4783 }
4784 } else {
4785 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4786 NULL /* file_name */);
4787 if (hMap == NULL) {
4788 if (PrintMiscellaneous && Verbose) {
4789 DWORD err = GetLastError();
4790 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4791 }
4792 CloseHandle(hFile);
4793 return NULL;
4794 }
4795
4796 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4797 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4798 (DWORD)bytes, addr);
4799 if (base == NULL) {
4800 if (PrintMiscellaneous && Verbose) {
4801 DWORD err = GetLastError();
4802 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4803 }
4804 CloseHandle(hMap);
4805 CloseHandle(hFile);
4806 return NULL;
4807 }
4808
4809 if (CloseHandle(hMap) == 0) {
4810 if (PrintMiscellaneous && Verbose) {
4811 DWORD err = GetLastError();
4812 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4813 }
4814 CloseHandle(hFile);
4815 return base;
4816 }
4817 }
4818
4819 if (allow_exec) {
4820 DWORD old_protect;
4821 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4822 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4823
4824 if (!res) {
4825 if (PrintMiscellaneous && Verbose) {
4826 DWORD err = GetLastError();
4827 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4828 }
4829 // Don't consider this a hard error, on IA32 even if the
4830 // VirtualProtect fails, we should still be able to execute
4831 CloseHandle(hFile);
4832 return base;
4833 }
4834 }
4835
4836 if (CloseHandle(hFile) == 0) {
4837 if (PrintMiscellaneous && Verbose) {
4838 DWORD err = GetLastError();
4839 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4840 }
4841 return base;
4842 }
4843
4844 return base;
4845 }
4846
4847
4848 // Remap a block of memory.
4849 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4850 char *addr, size_t bytes, bool read_only,
4851 bool allow_exec) {
4852 // This OS does not allow existing memory maps to be remapped so we
4853 // have to unmap the memory before we remap it.
4854 if (!os::unmap_memory(addr, bytes)) {
4855 return NULL;
4856 }
4857
4858 // There is a very small theoretical window between the unmap_memory()
4859 // call above and the map_memory() call below where a thread in native
4860 // code may be able to access an address that is no longer mapped.
4861
4862 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4863 read_only, allow_exec);
4864 }
4865
4866
4867 // Unmap a block of memory.
4868 // Returns true=success, otherwise false.
4869
4870 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4871 MEMORY_BASIC_INFORMATION mem_info;
4872 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4873 if (PrintMiscellaneous && Verbose) {
4874 DWORD err = GetLastError();
4875 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4876 }
4877 return false;
4878 }
4879
4880 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4881 // Instead, executable region was allocated using VirtualAlloc(). See
4882 // pd_map_memory() above.
4883 //
4884 // The following flags should match the 'exec_access' flages used for
4885 // VirtualProtect() in pd_map_memory().
4886 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4887 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4888 return pd_release_memory(addr, bytes);
4889 }
4890
4891 BOOL result = UnmapViewOfFile(addr);
4892 if (result == 0) {
4893 if (PrintMiscellaneous && Verbose) {
4894 DWORD err = GetLastError();
4895 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4896 }
4897 return false;
4898 }
4899 return true;
4900 }
4901
4902 void os::pause() {
4903 char filename[MAX_PATH];
4904 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4905 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4906 } else {
4907 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4908 }
4909
4910 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4911 if (fd != -1) {
4912 struct stat buf;
4913 ::close(fd);
4914 while (::stat(filename, &buf) == 0) {
4915 Sleep(100);
4916 }
4917 } else {
4918 jio_fprintf(stderr,
4919 "Could not open pause file '%s', continuing immediately.\n", filename);
4920 }
4921 }
4922
4923 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4924 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4925 }
4926
4927 // See the caveats for this class in os_windows.hpp
4928 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4929 // into this method and returns false. If no OS EXCEPTION was raised, returns
4930 // true.
4931 // The callback is supposed to provide the method that should be protected.
4932 //
4933 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4934 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4935 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4936 "crash_protection already set?");
4937
4938 bool success = true;
4939 __try {
4940 WatcherThread::watcher_thread()->set_crash_protection(this);
4941 cb.call();
4942 } __except(EXCEPTION_EXECUTE_HANDLER) {
4943 // only for protection, nothing to do
4944 success = false;
4945 }
4946 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4947 return success;
4948 }
4949
4950 // An Event wraps a win32 "CreateEvent" kernel handle.
4951 //
4952 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4953 //
4954 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4955 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4956 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4957 // In addition, an unpark() operation might fetch the handle field, but the
4958 // event could recycle between the fetch and the SetEvent() operation.
4959 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4960 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4961 // on an stale but recycled handle would be harmless, but in practice this might
4962 // confuse other non-Sun code, so it's not a viable approach.
4963 //
4964 // 2: Once a win32 event handle is associated with an Event, it remains associated
4965 // with the Event. The event handle is never closed. This could be construed
4966 // as handle leakage, but only up to the maximum # of threads that have been extant
4967 // at any one time. This shouldn't be an issue, as windows platforms typically
4968 // permit a process to have hundreds of thousands of open handles.
4969 //
4970 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4971 // and release unused handles.
4972 //
4973 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4974 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4975 //
4976 // 5. Use an RCU-like mechanism (Read-Copy Update).
4977 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4978 //
4979 // We use (2).
4980 //
4981 // TODO-FIXME:
4982 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4983 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4984 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4985 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4986 // into a single win32 CreateEvent() handle.
4987 //
4988 // Assumption:
4989 // Only one parker can exist on an event, which is why we allocate
4990 // them per-thread. Multiple unparkers can coexist.
4991 //
4992 // _Event transitions in park()
4993 // -1 => -1 : illegal
4994 // 1 => 0 : pass - return immediately
4995 // 0 => -1 : block; then set _Event to 0 before returning
4996 //
4997 // _Event transitions in unpark()
4998 // 0 => 1 : just return
4999 // 1 => 1 : just return
5000 // -1 => either 0 or 1; must signal target thread
5001 // That is, we can safely transition _Event from -1 to either
5002 // 0 or 1.
5003 //
5004 // _Event serves as a restricted-range semaphore.
5005 // -1 : thread is blocked, i.e. there is a waiter
5006 // 0 : neutral: thread is running or ready,
5007 // could have been signaled after a wait started
5008 // 1 : signaled - thread is running or ready
5009 //
5010 // Another possible encoding of _Event would be with
5011 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5012 //
5013
5014 int os::PlatformEvent::park(jlong Millis) {
5015 // Transitions for _Event:
5016 // -1 => -1 : illegal
5017 // 1 => 0 : pass - return immediately
5018 // 0 => -1 : block; then set _Event to 0 before returning
5019
5020 guarantee(_ParkHandle != NULL , "Invariant");
5021 guarantee(Millis > 0 , "Invariant");
5022
5023 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5024 // the initial park() operation.
5025 // Consider: use atomic decrement instead of CAS-loop
5026
5027 int v;
5028 for (;;) {
5029 v = _Event;
5030 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5031 }
5032 guarantee((v == 0) || (v == 1), "invariant");
5033 if (v != 0) return OS_OK;
5034
5035 // Do this the hard way by blocking ...
5036 // TODO: consider a brief spin here, gated on the success of recent
5037 // spin attempts by this thread.
5038 //
5039 // We decompose long timeouts into series of shorter timed waits.
5040 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5041 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5042 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5043 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5044 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5045 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5046 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5047 // for the already waited time. This policy does not admit any new outcomes.
5048 // In the future, however, we might want to track the accumulated wait time and
5049 // adjust Millis accordingly if we encounter a spurious wakeup.
5050
5051 const int MAXTIMEOUT = 0x10000000;
5052 DWORD rv = WAIT_TIMEOUT;
5053 while (_Event < 0 && Millis > 0) {
5054 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5055 if (Millis > MAXTIMEOUT) {
5056 prd = MAXTIMEOUT;
5057 }
5058 rv = ::WaitForSingleObject(_ParkHandle, prd);
5059 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5060 if (rv == WAIT_TIMEOUT) {
5061 Millis -= prd;
5062 }
5063 }
5064 v = _Event;
5065 _Event = 0;
5066 // see comment at end of os::PlatformEvent::park() below:
5067 OrderAccess::fence();
5068 // If we encounter a nearly simultanous timeout expiry and unpark()
5069 // we return OS_OK indicating we awoke via unpark().
5070 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5071 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5072 }
5073
5074 void os::PlatformEvent::park() {
5075 // Transitions for _Event:
5076 // -1 => -1 : illegal
5077 // 1 => 0 : pass - return immediately
5078 // 0 => -1 : block; then set _Event to 0 before returning
5079
5080 guarantee(_ParkHandle != NULL, "Invariant");
5081 // Invariant: Only the thread associated with the Event/PlatformEvent
5082 // may call park().
5083 // Consider: use atomic decrement instead of CAS-loop
5084 int v;
5085 for (;;) {
5086 v = _Event;
5087 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5088 }
5089 guarantee((v == 0) || (v == 1), "invariant");
5090 if (v != 0) return;
5091
5092 // Do this the hard way by blocking ...
5093 // TODO: consider a brief spin here, gated on the success of recent
5094 // spin attempts by this thread.
5095 while (_Event < 0) {
5096 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5097 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5098 }
5099
5100 // Usually we'll find _Event == 0 at this point, but as
5101 // an optional optimization we clear it, just in case can
5102 // multiple unpark() operations drove _Event up to 1.
5103 _Event = 0;
5104 OrderAccess::fence();
5105 guarantee(_Event >= 0, "invariant");
5106 }
5107
5108 void os::PlatformEvent::unpark() {
5109 guarantee(_ParkHandle != NULL, "Invariant");
5110
5111 // Transitions for _Event:
5112 // 0 => 1 : just return
5113 // 1 => 1 : just return
5114 // -1 => either 0 or 1; must signal target thread
5115 // That is, we can safely transition _Event from -1 to either
5116 // 0 or 1.
5117 // See also: "Semaphores in Plan 9" by Mullender & Cox
5118 //
5119 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5120 // that it will take two back-to-back park() calls for the owning
5121 // thread to block. This has the benefit of forcing a spurious return
5122 // from the first park() call after an unpark() call which will help
5123 // shake out uses of park() and unpark() without condition variables.
5124
5125 if (Atomic::xchg(1, &_Event) >= 0) return;
5126
5127 ::SetEvent(_ParkHandle);
5128 }
5129
5130
5131 // JSR166
5132 // -------------------------------------------------------
5133
5134 // The Windows implementation of Park is very straightforward: Basic
5135 // operations on Win32 Events turn out to have the right semantics to
5136 // use them directly. We opportunistically resuse the event inherited
5137 // from Monitor.
5138
5139 void Parker::park(bool isAbsolute, jlong time) {
5140 guarantee(_ParkEvent != NULL, "invariant");
5141 // First, demultiplex/decode time arguments
5142 if (time < 0) { // don't wait
5143 return;
5144 } else if (time == 0 && !isAbsolute) {
5145 time = INFINITE;
5146 } else if (isAbsolute) {
5147 time -= os::javaTimeMillis(); // convert to relative time
5148 if (time <= 0) { // already elapsed
5149 return;
5150 }
5151 } else { // relative
5152 time /= 1000000; // Must coarsen from nanos to millis
5153 if (time == 0) { // Wait for the minimal time unit if zero
5154 time = 1;
5155 }
5156 }
5157
5158 JavaThread* thread = JavaThread::current();
5159
5160 // Don't wait if interrupted or already triggered
5161 if (Thread::is_interrupted(thread, false) ||
5162 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5163 ResetEvent(_ParkEvent);
5164 return;
5165 } else {
5166 ThreadBlockInVM tbivm(thread);
5167 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5168 thread->set_suspend_equivalent();
5169
5170 WaitForSingleObject(_ParkEvent, time);
5171 ResetEvent(_ParkEvent);
5172
5173 // If externally suspended while waiting, re-suspend
5174 if (thread->handle_special_suspend_equivalent_condition()) {
5175 thread->java_suspend_self();
5176 }
5177 }
5178 }
5179
5180 void Parker::unpark() {
5181 guarantee(_ParkEvent != NULL, "invariant");
5182 SetEvent(_ParkEvent);
5183 }
5184
5185 // Run the specified command in a separate process. Return its exit value,
5186 // or -1 on failure (e.g. can't create a new process).
5187 int os::fork_and_exec(char* cmd) {
5188 STARTUPINFO si;
5189 PROCESS_INFORMATION pi;
5190
5191 memset(&si, 0, sizeof(si));
5192 si.cb = sizeof(si);
5193 memset(&pi, 0, sizeof(pi));
5194 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5195 cmd, // command line
5196 NULL, // process security attribute
5197 NULL, // thread security attribute
5198 TRUE, // inherits system handles
5199 0, // no creation flags
5200 NULL, // use parent's environment block
5201 NULL, // use parent's starting directory
5202 &si, // (in) startup information
5203 &pi); // (out) process information
5204
5205 if (rslt) {
5206 // Wait until child process exits.
5207 WaitForSingleObject(pi.hProcess, INFINITE);
5208
5209 DWORD exit_code;
5210 GetExitCodeProcess(pi.hProcess, &exit_code);
5211
5212 // Close process and thread handles.
5213 CloseHandle(pi.hProcess);
5214 CloseHandle(pi.hThread);
5215
5216 return (int)exit_code;
5217 } else {
5218 return -1;
5219 }
5220 }
5221
5222 //--------------------------------------------------------------------------------------------------
5223 // Non-product code
5224
5225 static int mallocDebugIntervalCounter = 0;
5226 static int mallocDebugCounter = 0;
5227 bool os::check_heap(bool force) {
5228 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5229 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5230 // Note: HeapValidate executes two hardware breakpoints when it finds something
5231 // wrong; at these points, eax contains the address of the offending block (I think).
5232 // To get to the exlicit error message(s) below, just continue twice.
5233 //
5234 // Note: we want to check the CRT heap, which is not necessarily located in the
5235 // process default heap.
5236 HANDLE heap = (HANDLE) _get_heap_handle();
5237 if (!heap) {
5238 return true;
5239 }
5240
5241 // If we fail to lock the heap, then gflags.exe has been used
5242 // or some other special heap flag has been set that prevents
5243 // locking. We don't try to walk a heap we can't lock.
5244 if (HeapLock(heap) != 0) {
5245 PROCESS_HEAP_ENTRY phe;
5246 phe.lpData = NULL;
5247 while (HeapWalk(heap, &phe) != 0) {
5248 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5249 !HeapValidate(heap, 0, phe.lpData)) {
5250 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5251 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5252 HeapUnlock(heap);
5253 fatal("corrupted C heap");
5254 }
5255 }
5256 DWORD err = GetLastError();
5257 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5258 HeapUnlock(heap);
5259 fatal("heap walk aborted with error %d", err);
5260 }
5261 HeapUnlock(heap);
5262 }
5263 mallocDebugIntervalCounter = 0;
5264 }
5265 return true;
5266 }
5267
5268
5269 bool os::find(address addr, outputStream* st) {
5270 int offset = -1;
5271 bool result = false;
5272 char buf[256];
5273 // Note: there is no easy way to handle library name trunctation here. In case
5274 // of truncation, we just omit the library name.
5275 // See also JDK-8147512.
5276 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5277 st->print(PTR_FORMAT " ", addr);
5278 if (strlen(buf) < 255) {
5279 char* p = strrchr(buf, '\\');
5280 if (p) {
5281 st->print("%s", p + 1);
5282 } else {
5283 st->print("%s", buf);
5284 }
5285 }
5286 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5287 st->print("::%s + 0x%x", buf, offset);
5288 }
5289 st->cr();
5290 result = true;
5291 }
5292 return result;
5293 }
5294
5295 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5296 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5297
5298 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5299 JavaThread* thread = JavaThread::current();
5300 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5301 address addr = (address) exceptionRecord->ExceptionInformation[1];
5302
5303 if (os::is_memory_serialize_page(thread, addr)) {
5304 return EXCEPTION_CONTINUE_EXECUTION;
5305 }
5306 }
5307
5308 return EXCEPTION_CONTINUE_SEARCH;
5309 }
5310
5311 // We don't build a headless jre for Windows
5312 bool os::is_headless_jre() { return false; }
5313
5314 static jint initSock() {
5315 WSADATA wsadata;
5316
5317 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5318 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5319 ::GetLastError());
5320 return JNI_ERR;
5321 }
5322 return JNI_OK;
5323 }
5324
5325 struct hostent* os::get_host_by_name(char* name) {
5326 return (struct hostent*)gethostbyname(name);
5327 }
5328
5329 int os::socket_close(int fd) {
5330 return ::closesocket(fd);
5331 }
5332
5333 int os::socket(int domain, int type, int protocol) {
5334 return ::socket(domain, type, protocol);
5335 }
5336
5337 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5338 return ::connect(fd, him, len);
5339 }
5340
5341 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5342 return ::recv(fd, buf, (int)nBytes, flags);
5343 }
5344
5345 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5346 return ::send(fd, buf, (int)nBytes, flags);
5347 }
5348
5349 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5350 return ::send(fd, buf, (int)nBytes, flags);
5351 }
5352
5353 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5354 #if defined(IA32)
5355 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5356 #elif defined (AMD64)
5357 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5358 #endif
5359
5360 // returns true if thread could be suspended,
5361 // false otherwise
5362 static bool do_suspend(HANDLE* h) {
5363 if (h != NULL) {
5364 if (SuspendThread(*h) != ~0) {
5365 return true;
5366 }
5367 }
5368 return false;
5369 }
5370
5371 // resume the thread
5372 // calling resume on an active thread is a no-op
5373 static void do_resume(HANDLE* h) {
5374 if (h != NULL) {
5375 ResumeThread(*h);
5376 }
5377 }
5378
5379 // retrieve a suspend/resume context capable handle
5380 // from the tid. Caller validates handle return value.
5381 void get_thread_handle_for_extended_context(HANDLE* h,
5382 OSThread::thread_id_t tid) {
5383 if (h != NULL) {
5384 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5385 }
5386 }
5387
5388 // Thread sampling implementation
5389 //
5390 void os::SuspendedThreadTask::internal_do_task() {
5391 CONTEXT ctxt;
5392 HANDLE h = NULL;
5393
5394 // get context capable handle for thread
5395 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5396
5397 // sanity
5398 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5399 return;
5400 }
5401
5402 // suspend the thread
5403 if (do_suspend(&h)) {
5404 ctxt.ContextFlags = sampling_context_flags;
5405 // get thread context
5406 GetThreadContext(h, &ctxt);
5407 SuspendedThreadTaskContext context(_thread, &ctxt);
5408 // pass context to Thread Sampling impl
5409 do_task(context);
5410 // resume thread
5411 do_resume(&h);
5412 }
5413
5414 // close handle
5415 CloseHandle(h);
5416 }
5417
5418 bool os::start_debugging(char *buf, int buflen) {
5419 int len = (int)strlen(buf);
5420 char *p = &buf[len];
5421
5422 jio_snprintf(p, buflen-len,
5423 "\n\n"
5424 "Do you want to debug the problem?\n\n"
5425 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5426 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5427 "Otherwise, select 'No' to abort...",
5428 os::current_process_id(), os::current_thread_id());
5429
5430 bool yes = os::message_box("Unexpected Error", buf);
5431
5432 if (yes) {
5433 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5434 // exception. If VM is running inside a debugger, the debugger will
5435 // catch the exception. Otherwise, the breakpoint exception will reach
5436 // the default windows exception handler, which can spawn a debugger and
5437 // automatically attach to the dying VM.
5438 os::breakpoint();
5439 yes = false;
5440 }
5441 return yes;
5442 }
5443
5444 void* os::get_default_process_handle() {
5445 return (void*)GetModuleHandle(NULL);
5446 }
5447
5448 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5449 // which is used to find statically linked in agents.
5450 // Additionally for windows, takes into account __stdcall names.
5451 // Parameters:
5452 // sym_name: Symbol in library we are looking for
5453 // lib_name: Name of library to look in, NULL for shared libs.
5454 // is_absolute_path == true if lib_name is absolute path to agent
5455 // such as "C:/a/b/L.dll"
5456 // == false if only the base name of the library is passed in
5457 // such as "L"
5458 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5459 bool is_absolute_path) {
5460 char *agent_entry_name;
5461 size_t len;
5462 size_t name_len;
5463 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5464 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5465 const char *start;
5466
5467 if (lib_name != NULL) {
5468 len = name_len = strlen(lib_name);
5469 if (is_absolute_path) {
5470 // Need to strip path, prefix and suffix
5471 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5472 lib_name = ++start;
5473 } else {
5474 // Need to check for drive prefix
5475 if ((start = strchr(lib_name, ':')) != NULL) {
5476 lib_name = ++start;
5477 }
5478 }
5479 if (len <= (prefix_len + suffix_len)) {
5480 return NULL;
5481 }
5482 lib_name += prefix_len;
5483 name_len = strlen(lib_name) - suffix_len;
5484 }
5485 }
5486 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5487 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5488 if (agent_entry_name == NULL) {
5489 return NULL;
5490 }
5491 if (lib_name != NULL) {
5492 const char *p = strrchr(sym_name, '@');
5493 if (p != NULL && p != sym_name) {
5494 // sym_name == _Agent_OnLoad@XX
5495 strncpy(agent_entry_name, sym_name, (p - sym_name));
5496 agent_entry_name[(p-sym_name)] = '\0';
5497 // agent_entry_name == _Agent_OnLoad
5498 strcat(agent_entry_name, "_");
5499 strncat(agent_entry_name, lib_name, name_len);
5500 strcat(agent_entry_name, p);
5501 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5502 } else {
5503 strcpy(agent_entry_name, sym_name);
5504 strcat(agent_entry_name, "_");
5505 strncat(agent_entry_name, lib_name, name_len);
5506 }
5507 } else {
5508 strcpy(agent_entry_name, sym_name);
5509 }
5510 return agent_entry_name;
5511 }
5512
5513 #ifndef PRODUCT
5514
5515 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5516 // contiguous memory block at a particular address.
5517 // The test first tries to find a good approximate address to allocate at by using the same
5518 // method to allocate some memory at any address. The test then tries to allocate memory in
5519 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5520 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5521 // the previously allocated memory is available for allocation. The only actual failure
5522 // that is reported is when the test tries to allocate at a particular location but gets a
5523 // different valid one. A NULL return value at this point is not considered an error but may
5524 // be legitimate.
5525 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5526 void TestReserveMemorySpecial_test() {
5527 if (!UseLargePages) {
5528 if (VerboseInternalVMTests) {
5529 tty->print("Skipping test because large pages are disabled");
5530 }
5531 return;
5532 }
5533 // save current value of globals
5534 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5535 bool old_use_numa_interleaving = UseNUMAInterleaving;
5536
5537 // set globals to make sure we hit the correct code path
5538 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5539
5540 // do an allocation at an address selected by the OS to get a good one.
5541 const size_t large_allocation_size = os::large_page_size() * 4;
5542 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5543 if (result == NULL) {
5544 if (VerboseInternalVMTests) {
5545 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5546 large_allocation_size);
5547 }
5548 } else {
5549 os::release_memory_special(result, large_allocation_size);
5550
5551 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5552 // we managed to get it once.
5553 const size_t expected_allocation_size = os::large_page_size();
5554 char* expected_location = result + os::large_page_size();
5555 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5556 if (actual_location == NULL) {
5557 if (VerboseInternalVMTests) {
5558 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5559 expected_location, large_allocation_size);
5560 }
5561 } else {
5562 // release memory
5563 os::release_memory_special(actual_location, expected_allocation_size);
5564 // only now check, after releasing any memory to avoid any leaks.
5565 assert(actual_location == expected_location,
5566 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5567 expected_location, expected_allocation_size, actual_location);
5568 }
5569 }
5570
5571 // restore globals
5572 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5573 UseNUMAInterleaving = old_use_numa_interleaving;
5574 }
5575 #endif // PRODUCT
5576
5577 /*
5578 All the defined signal names for Windows.
5579
5580 NOTE that not all of these names are accepted by FindSignal!
5581
5582 For various reasons some of these may be rejected at runtime.
5583
5584 Here are the names currently accepted by a user of sun.misc.Signal with
5585 1.4.1 (ignoring potential interaction with use of chaining, etc):
5586
5587 (LIST TBD)
5588
5589 */
5590 int os::get_signal_number(const char* name) {
5591 static const struct {
5592 char* name;
5593 int number;
5594 } siglabels [] =
5595 // derived from version 6.0 VC98/include/signal.h
5596 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5597 "FPE", SIGFPE, // floating point exception
5598 "SEGV", SIGSEGV, // segment violation
5599 "INT", SIGINT, // interrupt
5600 "TERM", SIGTERM, // software term signal from kill
5601 "BREAK", SIGBREAK, // Ctrl-Break sequence
5602 "ILL", SIGILL}; // illegal instruction
5603 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
5604 if(!strcmp(name, siglabels[i].name))
5605 return siglabels[i].number;
5606 return -1;
5607 }
5608
5609 // Fast current thread access
5610
5611 int os::win32::_thread_ptr_offset = 0;
5612
5613 static void call_wrapper_dummy() {}
5614
5615 // We need to call the os_exception_wrapper once so that it sets
5616 // up the offset from FS of the thread pointer.
5617 void os::win32::initialize_thread_ptr_offset() {
5618 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5619 NULL, NULL, NULL, NULL);
5620 }