1 /*
2 * Copyright (c) 1997, 2015, 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 = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 thread->initialize_thread_current();
423
424 OSThread* osthr = thread->osthread();
425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
426
427 if (UseNUMA) {
428 int lgrp_id = os::numa_get_group_id();
429 if (lgrp_id != -1) {
430 thread->set_lgrp_id(lgrp_id);
431 }
432 }
433
434 // Diagnostic code to investigate JDK-6573254
435 int res = 30115; // non-java thread
436 if (thread->is_Java_thread()) {
437 res = 20115; // java thread
438 }
439
440 // Install a win32 structured exception handler around every thread created
441 // by VM, so VM can generate error dump when an exception occurred in non-
442 // Java thread (e.g. VM thread).
443 __try {
444 thread->run();
445 } __except(topLevelExceptionFilter(
446 (_EXCEPTION_POINTERS*)_exception_info())) {
447 // Nothing to do.
448 }
449
450 // One less thread is executing
451 // When the VMThread gets here, the main thread may have already exited
452 // which frees the CodeHeap containing the Atomic::add code
453 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
454 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
455 }
456
457 // Thread must not return from exit_process_or_thread(), but if it does,
458 // let it proceed to exit normally
459 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
460 }
461
462 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
463 int thread_id) {
464 // Allocate the OSThread object
465 OSThread* osthread = new OSThread(NULL, NULL);
466 if (osthread == NULL) return NULL;
467
468 // Initialize support for Java interrupts
469 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
470 if (interrupt_event == NULL) {
471 delete osthread;
472 return NULL;
473 }
474 osthread->set_interrupt_event(interrupt_event);
475
476 // Store info on the Win32 thread into the OSThread
477 osthread->set_thread_handle(thread_handle);
478 osthread->set_thread_id(thread_id);
479
480 if (UseNUMA) {
481 int lgrp_id = os::numa_get_group_id();
482 if (lgrp_id != -1) {
483 thread->set_lgrp_id(lgrp_id);
484 }
485 }
486
487 // Initial thread state is INITIALIZED, not SUSPENDED
488 osthread->set_state(INITIALIZED);
489
490 return osthread;
491 }
492
493
494 bool os::create_attached_thread(JavaThread* thread) {
495 #ifdef ASSERT
496 thread->verify_not_published();
497 #endif
498 HANDLE thread_h;
499 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
500 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
501 fatal("DuplicateHandle failed\n");
502 }
503 OSThread* osthread = create_os_thread(thread, thread_h,
504 (int)current_thread_id());
505 if (osthread == NULL) {
506 return false;
507 }
508
509 // Initial thread state is RUNNABLE
510 osthread->set_state(RUNNABLE);
511
512 thread->set_osthread(osthread);
513 return true;
514 }
515
516 bool os::create_main_thread(JavaThread* thread) {
517 #ifdef ASSERT
518 thread->verify_not_published();
519 #endif
520 if (_starting_thread == NULL) {
521 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
522 if (_starting_thread == NULL) {
523 return false;
524 }
525 }
526
527 // The primordial thread is runnable from the start)
528 _starting_thread->set_state(RUNNABLE);
529
530 thread->set_osthread(_starting_thread);
531 return true;
532 }
533
534 // Allocate and initialize a new OSThread
535 bool os::create_thread(Thread* thread, ThreadType thr_type,
536 size_t stack_size) {
537 unsigned thread_id;
538
539 // Allocate the OSThread object
540 OSThread* osthread = new OSThread(NULL, NULL);
541 if (osthread == NULL) {
542 return false;
543 }
544
545 // Initialize support for Java interrupts
546 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
547 if (interrupt_event == NULL) {
548 delete osthread;
549 return NULL;
550 }
551 osthread->set_interrupt_event(interrupt_event);
552 osthread->set_interrupted(false);
553
554 thread->set_osthread(osthread);
555
556 if (stack_size == 0) {
557 switch (thr_type) {
558 case os::java_thread:
559 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
560 if (JavaThread::stack_size_at_create() > 0) {
561 stack_size = JavaThread::stack_size_at_create();
562 }
563 break;
564 case os::compiler_thread:
565 if (CompilerThreadStackSize > 0) {
566 stack_size = (size_t)(CompilerThreadStackSize * K);
567 break;
568 } // else fall through:
569 // use VMThreadStackSize if CompilerThreadStackSize is not defined
570 case os::vm_thread:
571 case os::pgc_thread:
572 case os::cgc_thread:
573 case os::watcher_thread:
574 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
575 break;
576 }
577 }
578
579 // Create the Win32 thread
580 //
581 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
582 // does not specify stack size. Instead, it specifies the size of
583 // initially committed space. The stack size is determined by
584 // PE header in the executable. If the committed "stack_size" is larger
585 // than default value in the PE header, the stack is rounded up to the
586 // nearest multiple of 1MB. For example if the launcher has default
587 // stack size of 320k, specifying any size less than 320k does not
588 // affect the actual stack size at all, it only affects the initial
589 // commitment. On the other hand, specifying 'stack_size' larger than
590 // default value may cause significant increase in memory usage, because
591 // not only the stack space will be rounded up to MB, but also the
592 // entire space is committed upfront.
593 //
594 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
595 // for CreateThread() that can treat 'stack_size' as stack size. However we
596 // are not supposed to call CreateThread() directly according to MSDN
597 // document because JVM uses C runtime library. The good news is that the
598 // flag appears to work with _beginthredex() as well.
599
600 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
601 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
602 #endif
603
604 HANDLE thread_handle =
605 (HANDLE)_beginthreadex(NULL,
606 (unsigned)stack_size,
607 (unsigned (__stdcall *)(void*)) java_start,
608 thread,
609 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
610 &thread_id);
611 if (thread_handle == NULL) {
612 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
613 // without the flag.
614 thread_handle =
615 (HANDLE)_beginthreadex(NULL,
616 (unsigned)stack_size,
617 (unsigned (__stdcall *)(void*)) java_start,
618 thread,
619 CREATE_SUSPENDED,
620 &thread_id);
621 }
622 if (thread_handle == NULL) {
623 // Need to clean up stuff we've allocated so far
624 CloseHandle(osthread->interrupt_event());
625 thread->set_osthread(NULL);
626 delete osthread;
627 return NULL;
628 }
629
630 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
631
632 // Store info on the Win32 thread into the OSThread
633 osthread->set_thread_handle(thread_handle);
634 osthread->set_thread_id(thread_id);
635
636 // Initial thread state is INITIALIZED, not SUSPENDED
637 osthread->set_state(INITIALIZED);
638
639 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
640 return true;
641 }
642
643
644 // Free Win32 resources related to the OSThread
645 void os::free_thread(OSThread* osthread) {
646 assert(osthread != NULL, "osthread not set");
647 CloseHandle(osthread->thread_handle());
648 CloseHandle(osthread->interrupt_event());
649 delete osthread;
650 }
651
652 static jlong first_filetime;
653 static jlong initial_performance_count;
654 static jlong performance_frequency;
655
656
657 jlong as_long(LARGE_INTEGER x) {
658 jlong result = 0; // initialization to avoid warning
659 set_high(&result, x.HighPart);
660 set_low(&result, x.LowPart);
661 return result;
662 }
663
664
665 jlong os::elapsed_counter() {
666 LARGE_INTEGER count;
667 if (win32::_has_performance_count) {
668 QueryPerformanceCounter(&count);
669 return as_long(count) - initial_performance_count;
670 } else {
671 FILETIME wt;
672 GetSystemTimeAsFileTime(&wt);
673 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
674 }
675 }
676
677
678 jlong os::elapsed_frequency() {
679 if (win32::_has_performance_count) {
680 return performance_frequency;
681 } else {
682 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
683 return 10000000;
684 }
685 }
686
687
688 julong os::available_memory() {
689 return win32::available_memory();
690 }
691
692 julong os::win32::available_memory() {
693 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
694 // value if total memory is larger than 4GB
695 MEMORYSTATUSEX ms;
696 ms.dwLength = sizeof(ms);
697 GlobalMemoryStatusEx(&ms);
698
699 return (julong)ms.ullAvailPhys;
700 }
701
702 julong os::physical_memory() {
703 return win32::physical_memory();
704 }
705
706 bool os::has_allocatable_memory_limit(julong* limit) {
707 MEMORYSTATUSEX ms;
708 ms.dwLength = sizeof(ms);
709 GlobalMemoryStatusEx(&ms);
710 #ifdef _LP64
711 *limit = (julong)ms.ullAvailVirtual;
712 return true;
713 #else
714 // Limit to 1400m because of the 2gb address space wall
715 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
716 return true;
717 #endif
718 }
719
720 // VC6 lacks DWORD_PTR
721 #if _MSC_VER < 1300
722 typedef UINT_PTR DWORD_PTR;
723 #endif
724
725 int os::active_processor_count() {
726 DWORD_PTR lpProcessAffinityMask = 0;
727 DWORD_PTR lpSystemAffinityMask = 0;
728 int proc_count = processor_count();
729 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
730 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
731 // Nof active processors is number of bits in process affinity mask
732 int bitcount = 0;
733 while (lpProcessAffinityMask != 0) {
734 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
735 bitcount++;
736 }
737 return bitcount;
738 } else {
739 return proc_count;
740 }
741 }
742
743 void os::set_native_thread_name(const char *name) {
744
745 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
746 //
747 // Note that unfortunately this only works if the process
748 // is already attached to a debugger; debugger must observe
749 // the exception below to show the correct name.
750
751 const DWORD MS_VC_EXCEPTION = 0x406D1388;
752 struct {
753 DWORD dwType; // must be 0x1000
754 LPCSTR szName; // pointer to name (in user addr space)
755 DWORD dwThreadID; // thread ID (-1=caller thread)
756 DWORD dwFlags; // reserved for future use, must be zero
757 } info;
758
759 info.dwType = 0x1000;
760 info.szName = name;
761 info.dwThreadID = -1;
762 info.dwFlags = 0;
763
764 __try {
765 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
766 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
767 }
768
769 bool os::distribute_processes(uint length, uint* distribution) {
770 // Not yet implemented.
771 return false;
772 }
773
774 bool os::bind_to_processor(uint processor_id) {
775 // Not yet implemented.
776 return false;
777 }
778
779 void os::win32::initialize_performance_counter() {
780 LARGE_INTEGER count;
781 if (QueryPerformanceFrequency(&count)) {
782 win32::_has_performance_count = 1;
783 performance_frequency = as_long(count);
784 QueryPerformanceCounter(&count);
785 initial_performance_count = as_long(count);
786 } else {
787 win32::_has_performance_count = 0;
788 FILETIME wt;
789 GetSystemTimeAsFileTime(&wt);
790 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
791 }
792 }
793
794
795 double os::elapsedTime() {
796 return (double) elapsed_counter() / (double) elapsed_frequency();
797 }
798
799
800 // Windows format:
801 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
802 // Java format:
803 // Java standards require the number of milliseconds since 1/1/1970
804
805 // Constant offset - calculated using offset()
806 static jlong _offset = 116444736000000000;
807 // Fake time counter for reproducible results when debugging
808 static jlong fake_time = 0;
809
810 #ifdef ASSERT
811 // Just to be safe, recalculate the offset in debug mode
812 static jlong _calculated_offset = 0;
813 static int _has_calculated_offset = 0;
814
815 jlong offset() {
816 if (_has_calculated_offset) return _calculated_offset;
817 SYSTEMTIME java_origin;
818 java_origin.wYear = 1970;
819 java_origin.wMonth = 1;
820 java_origin.wDayOfWeek = 0; // ignored
821 java_origin.wDay = 1;
822 java_origin.wHour = 0;
823 java_origin.wMinute = 0;
824 java_origin.wSecond = 0;
825 java_origin.wMilliseconds = 0;
826 FILETIME jot;
827 if (!SystemTimeToFileTime(&java_origin, &jot)) {
828 fatal("Error = %d\nWindows error", GetLastError());
829 }
830 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
831 _has_calculated_offset = 1;
832 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
833 return _calculated_offset;
834 }
835 #else
836 jlong offset() {
837 return _offset;
838 }
839 #endif
840
841 jlong windows_to_java_time(FILETIME wt) {
842 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
843 return (a - offset()) / 10000;
844 }
845
846 // Returns time ticks in (10th of micro seconds)
847 jlong windows_to_time_ticks(FILETIME wt) {
848 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
849 return (a - offset());
850 }
851
852 FILETIME java_to_windows_time(jlong l) {
853 jlong a = (l * 10000) + offset();
854 FILETIME result;
855 result.dwHighDateTime = high(a);
856 result.dwLowDateTime = low(a);
857 return result;
858 }
859
860 bool os::supports_vtime() { return true; }
861 bool os::enable_vtime() { return false; }
862 bool os::vtime_enabled() { return false; }
863
864 double os::elapsedVTime() {
865 FILETIME created;
866 FILETIME exited;
867 FILETIME kernel;
868 FILETIME user;
869 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
870 // the resolution of windows_to_java_time() should be sufficient (ms)
871 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
872 } else {
873 return elapsedTime();
874 }
875 }
876
877 jlong os::javaTimeMillis() {
878 if (UseFakeTimers) {
879 return fake_time++;
880 } else {
881 FILETIME wt;
882 GetSystemTimeAsFileTime(&wt);
883 return windows_to_java_time(wt);
884 }
885 }
886
887 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
888 FILETIME wt;
889 GetSystemTimeAsFileTime(&wt);
890 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
891 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
892 seconds = secs;
893 nanos = jlong(ticks - (secs*10000000)) * 100;
894 }
895
896 jlong os::javaTimeNanos() {
897 if (!win32::_has_performance_count) {
898 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
899 } else {
900 LARGE_INTEGER current_count;
901 QueryPerformanceCounter(¤t_count);
902 double current = as_long(current_count);
903 double freq = performance_frequency;
904 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
905 return time;
906 }
907 }
908
909 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
910 if (!win32::_has_performance_count) {
911 // javaTimeMillis() doesn't have much percision,
912 // but it is not going to wrap -- so all 64 bits
913 info_ptr->max_value = ALL_64_BITS;
914
915 // this is a wall clock timer, so may skip
916 info_ptr->may_skip_backward = true;
917 info_ptr->may_skip_forward = true;
918 } else {
919 jlong freq = performance_frequency;
920 if (freq < NANOSECS_PER_SEC) {
921 // the performance counter is 64 bits and we will
922 // be multiplying it -- so no wrap in 64 bits
923 info_ptr->max_value = ALL_64_BITS;
924 } else if (freq > NANOSECS_PER_SEC) {
925 // use the max value the counter can reach to
926 // determine the max value which could be returned
927 julong max_counter = (julong)ALL_64_BITS;
928 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
929 } else {
930 // the performance counter is 64 bits and we will
931 // be using it directly -- so no wrap in 64 bits
932 info_ptr->max_value = ALL_64_BITS;
933 }
934
935 // using a counter, so no skipping
936 info_ptr->may_skip_backward = false;
937 info_ptr->may_skip_forward = false;
938 }
939 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
940 }
941
942 char* os::local_time_string(char *buf, size_t buflen) {
943 SYSTEMTIME st;
944 GetLocalTime(&st);
945 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
946 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
947 return buf;
948 }
949
950 bool os::getTimesSecs(double* process_real_time,
951 double* process_user_time,
952 double* process_system_time) {
953 HANDLE h_process = GetCurrentProcess();
954 FILETIME create_time, exit_time, kernel_time, user_time;
955 BOOL result = GetProcessTimes(h_process,
956 &create_time,
957 &exit_time,
958 &kernel_time,
959 &user_time);
960 if (result != 0) {
961 FILETIME wt;
962 GetSystemTimeAsFileTime(&wt);
963 jlong rtc_millis = windows_to_java_time(wt);
964 jlong user_millis = windows_to_java_time(user_time);
965 jlong system_millis = windows_to_java_time(kernel_time);
966 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
967 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
968 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
969 return true;
970 } else {
971 return false;
972 }
973 }
974
975 void os::shutdown() {
976 // allow PerfMemory to attempt cleanup of any persistent resources
977 perfMemory_exit();
978
979 // flush buffered output, finish log files
980 ostream_abort();
981
982 // Check for abort hook
983 abort_hook_t abort_hook = Arguments::abort_hook();
984 if (abort_hook != NULL) {
985 abort_hook();
986 }
987 }
988
989
990 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
991 PMINIDUMP_EXCEPTION_INFORMATION,
992 PMINIDUMP_USER_STREAM_INFORMATION,
993 PMINIDUMP_CALLBACK_INFORMATION);
994
995 static HANDLE dumpFile = NULL;
996
997 // Check if dump file can be created.
998 void os::check_dump_limit(char* buffer, size_t buffsz) {
999 bool status = true;
1000 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1001 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1002 status = false;
1003 }
1004
1005 #ifndef ASSERT
1006 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1007 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1008 status = false;
1009 }
1010 #endif
1011
1012 if (status) {
1013 const char* cwd = get_current_directory(NULL, 0);
1014 int pid = current_process_id();
1015 if (cwd != NULL) {
1016 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1017 } else {
1018 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1019 }
1020
1021 if (dumpFile == NULL &&
1022 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1023 == INVALID_HANDLE_VALUE) {
1024 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1025 status = false;
1026 }
1027 }
1028 VMError::record_coredump_status(buffer, status);
1029 }
1030
1031 void os::abort(bool dump_core, void* siginfo, const void* context) {
1032 HINSTANCE dbghelp;
1033 EXCEPTION_POINTERS ep;
1034 MINIDUMP_EXCEPTION_INFORMATION mei;
1035 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1036
1037 HANDLE hProcess = GetCurrentProcess();
1038 DWORD processId = GetCurrentProcessId();
1039 MINIDUMP_TYPE dumpType;
1040
1041 shutdown();
1042 if (!dump_core || dumpFile == NULL) {
1043 if (dumpFile != NULL) {
1044 CloseHandle(dumpFile);
1045 }
1046 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1047 }
1048
1049 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1050
1051 if (dbghelp == NULL) {
1052 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1053 CloseHandle(dumpFile);
1054 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1055 }
1056
1057 _MiniDumpWriteDump =
1058 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1059 PMINIDUMP_EXCEPTION_INFORMATION,
1060 PMINIDUMP_USER_STREAM_INFORMATION,
1061 PMINIDUMP_CALLBACK_INFORMATION),
1062 GetProcAddress(dbghelp,
1063 "MiniDumpWriteDump"));
1064
1065 if (_MiniDumpWriteDump == NULL) {
1066 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1067 CloseHandle(dumpFile);
1068 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1069 }
1070
1071 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1072
1073 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1074 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1075 #if API_VERSION_NUMBER >= 11
1076 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1077 MiniDumpWithUnloadedModules);
1078 #endif
1079
1080 if (siginfo != NULL && context != NULL) {
1081 ep.ContextRecord = (PCONTEXT) context;
1082 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1083
1084 mei.ThreadId = GetCurrentThreadId();
1085 mei.ExceptionPointers = &ep;
1086 pmei = &mei;
1087 } else {
1088 pmei = NULL;
1089 }
1090
1091 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1092 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1093 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1094 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1095 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1096 }
1097 CloseHandle(dumpFile);
1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1099 }
1100
1101 // Die immediately, no exit hook, no abort hook, no cleanup.
1102 void os::die() {
1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1104 }
1105
1106 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1107 // * dirent_md.c 1.15 00/02/02
1108 //
1109 // The declarations for DIR and struct dirent are in jvm_win32.h.
1110
1111 // Caller must have already run dirname through JVM_NativePath, which removes
1112 // duplicate slashes and converts all instances of '/' into '\\'.
1113
1114 DIR * os::opendir(const char *dirname) {
1115 assert(dirname != NULL, "just checking"); // hotspot change
1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1117 DWORD fattr; // hotspot change
1118 char alt_dirname[4] = { 0, 0, 0, 0 };
1119
1120 if (dirp == 0) {
1121 errno = ENOMEM;
1122 return 0;
1123 }
1124
1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1126 // as a directory in FindFirstFile(). We detect this case here and
1127 // prepend the current drive name.
1128 //
1129 if (dirname[1] == '\0' && dirname[0] == '\\') {
1130 alt_dirname[0] = _getdrive() + 'A' - 1;
1131 alt_dirname[1] = ':';
1132 alt_dirname[2] = '\\';
1133 alt_dirname[3] = '\0';
1134 dirname = alt_dirname;
1135 }
1136
1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1138 if (dirp->path == 0) {
1139 free(dirp);
1140 errno = ENOMEM;
1141 return 0;
1142 }
1143 strcpy(dirp->path, dirname);
1144
1145 fattr = GetFileAttributes(dirp->path);
1146 if (fattr == 0xffffffff) {
1147 free(dirp->path);
1148 free(dirp);
1149 errno = ENOENT;
1150 return 0;
1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1152 free(dirp->path);
1153 free(dirp);
1154 errno = ENOTDIR;
1155 return 0;
1156 }
1157
1158 // Append "*.*", or possibly "\\*.*", to path
1159 if (dirp->path[1] == ':' &&
1160 (dirp->path[2] == '\0' ||
1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1162 // No '\\' needed for cases like "Z:" or "Z:\"
1163 strcat(dirp->path, "*.*");
1164 } else {
1165 strcat(dirp->path, "\\*.*");
1166 }
1167
1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1169 if (dirp->handle == INVALID_HANDLE_VALUE) {
1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1171 free(dirp->path);
1172 free(dirp);
1173 errno = EACCES;
1174 return 0;
1175 }
1176 }
1177 return dirp;
1178 }
1179
1180 // parameter dbuf unused on Windows
1181 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1182 assert(dirp != NULL, "just checking"); // hotspot change
1183 if (dirp->handle == INVALID_HANDLE_VALUE) {
1184 return 0;
1185 }
1186
1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1188
1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1190 if (GetLastError() == ERROR_INVALID_HANDLE) {
1191 errno = EBADF;
1192 return 0;
1193 }
1194 FindClose(dirp->handle);
1195 dirp->handle = INVALID_HANDLE_VALUE;
1196 }
1197
1198 return &dirp->dirent;
1199 }
1200
1201 int os::closedir(DIR *dirp) {
1202 assert(dirp != NULL, "just checking"); // hotspot change
1203 if (dirp->handle != INVALID_HANDLE_VALUE) {
1204 if (!FindClose(dirp->handle)) {
1205 errno = EBADF;
1206 return -1;
1207 }
1208 dirp->handle = INVALID_HANDLE_VALUE;
1209 }
1210 free(dirp->path);
1211 free(dirp);
1212 return 0;
1213 }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() {
1218 static char path_buf[MAX_PATH];
1219 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1220 return path_buf;
1221 } else {
1222 path_buf[0] = '\0';
1223 return path_buf;
1224 }
1225 }
1226
1227 static bool file_exists(const char* filename) {
1228 if (filename == NULL || strlen(filename) == 0) {
1229 return false;
1230 }
1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1232 }
1233
1234 bool os::dll_build_name(char *buffer, size_t buflen,
1235 const char* pname, const char* fname) {
1236 bool retval = false;
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1239
1240 // Return error on buffer overflow.
1241 if (pnamelen + strlen(fname) + 10 > buflen) {
1242 return retval;
1243 }
1244
1245 if (pnamelen == 0) {
1246 jio_snprintf(buffer, buflen, "%s.dll", fname);
1247 retval = true;
1248 } else if (c == ':' || c == '\\') {
1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1250 retval = true;
1251 } else if (strchr(pname, *os::path_separator()) != NULL) {
1252 int n;
1253 char** pelements = split_path(pname, &n);
1254 if (pelements == NULL) {
1255 return false;
1256 }
1257 for (int i = 0; i < n; i++) {
1258 char* path = pelements[i];
1259 // Really shouldn't be NULL, but check can't hurt
1260 size_t plen = (path == NULL) ? 0 : strlen(path);
1261 if (plen == 0) {
1262 continue; // skip the empty path values
1263 }
1264 const char lastchar = path[plen - 1];
1265 if (lastchar == ':' || lastchar == '\\') {
1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1267 } else {
1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1269 }
1270 if (file_exists(buffer)) {
1271 retval = true;
1272 break;
1273 }
1274 }
1275 // release the storage
1276 for (int i = 0; i < n; i++) {
1277 if (pelements[i] != NULL) {
1278 FREE_C_HEAP_ARRAY(char, pelements[i]);
1279 }
1280 }
1281 if (pelements != NULL) {
1282 FREE_C_HEAP_ARRAY(char*, pelements);
1283 }
1284 } else {
1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1286 retval = true;
1287 }
1288 return retval;
1289 }
1290
1291 // Needs to be in os specific directory because windows requires another
1292 // header file <direct.h>
1293 const char* os::get_current_directory(char *buf, size_t buflen) {
1294 int n = static_cast<int>(buflen);
1295 if (buflen > INT_MAX) n = INT_MAX;
1296 return _getcwd(buf, n);
1297 }
1298
1299 //-----------------------------------------------------------
1300 // Helper functions for fatal error handler
1301 #ifdef _WIN64
1302 // Helper routine which returns true if address in
1303 // within the NTDLL address space.
1304 //
1305 static bool _addr_in_ntdll(address addr) {
1306 HMODULE hmod;
1307 MODULEINFO minfo;
1308
1309 hmod = GetModuleHandle("NTDLL.DLL");
1310 if (hmod == NULL) return false;
1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1312 &minfo, sizeof(MODULEINFO))) {
1313 return false;
1314 }
1315
1316 if ((addr >= minfo.lpBaseOfDll) &&
1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1318 return true;
1319 } else {
1320 return false;
1321 }
1322 }
1323 #endif
1324
1325 struct _modinfo {
1326 address addr;
1327 char* full_path; // point to a char buffer
1328 int buflen; // size of the buffer
1329 address base_addr;
1330 };
1331
1332 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 struct _modinfo *pmod = (struct _modinfo *)param;
1335 if (!pmod) return -1;
1336
1337 if (base_addr <= pmod->addr &&
1338 top_address > pmod->addr) {
1339 // if a buffer is provided, copy path name to the buffer
1340 if (pmod->full_path) {
1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1342 }
1343 pmod->base_addr = base_addr;
1344 return 1;
1345 }
1346 return 0;
1347 }
1348
1349 bool os::dll_address_to_library_name(address addr, char* buf,
1350 int buflen, int* offset) {
1351 // buf is not optional, but offset is optional
1352 assert(buf != NULL, "sanity check");
1353
1354 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1355 // return the full path to the DLL file, sometimes it returns path
1356 // to the corresponding PDB file (debug info); sometimes it only
1357 // returns partial path, which makes life painful.
1358
1359 struct _modinfo mi;
1360 mi.addr = addr;
1361 mi.full_path = buf;
1362 mi.buflen = buflen;
1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1364 // buf already contains path name
1365 if (offset) *offset = addr - mi.base_addr;
1366 return true;
1367 }
1368
1369 buf[0] = '\0';
1370 if (offset) *offset = -1;
1371 return false;
1372 }
1373
1374 bool os::dll_address_to_function_name(address addr, char *buf,
1375 int buflen, int *offset,
1376 bool demangle) {
1377 // buf is not optional, but offset is optional
1378 assert(buf != NULL, "sanity check");
1379
1380 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1381 return true;
1382 }
1383 if (offset != NULL) *offset = -1;
1384 buf[0] = '\0';
1385 return false;
1386 }
1387
1388 // save the start and end address of jvm.dll into param[0] and param[1]
1389 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1390 address top_address, void * param) {
1391 if (!param) return -1;
1392
1393 if (base_addr <= (address)_locate_jvm_dll &&
1394 top_address > (address)_locate_jvm_dll) {
1395 ((address*)param)[0] = base_addr;
1396 ((address*)param)[1] = top_address;
1397 return 1;
1398 }
1399 return 0;
1400 }
1401
1402 address vm_lib_location[2]; // start and end address of jvm.dll
1403
1404 // check if addr is inside jvm.dll
1405 bool os::address_is_in_vm(address addr) {
1406 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1408 assert(false, "Can't find jvm module.");
1409 return false;
1410 }
1411 }
1412
1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1414 }
1415
1416 // print module info; param is outputStream*
1417 static int _print_module(const char* fname, address base_address,
1418 address top_address, void* param) {
1419 if (!param) return -1;
1420
1421 outputStream* st = (outputStream*)param;
1422
1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1424 return 0;
1425 }
1426
1427 // Loads .dll/.so and
1428 // in case of error it checks if .dll/.so was built for the
1429 // same architecture as Hotspot is running on
1430 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1431 void * result = LoadLibrary(name);
1432 if (result != NULL) {
1433 return result;
1434 }
1435
1436 DWORD errcode = GetLastError();
1437 if (errcode == ERROR_MOD_NOT_FOUND) {
1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1439 ebuf[ebuflen - 1] = '\0';
1440 return NULL;
1441 }
1442
1443 // Parsing dll below
1444 // If we can read dll-info and find that dll was built
1445 // for an architecture other than Hotspot is running in
1446 // - then print to buffer "DLL was built for a different architecture"
1447 // else call os::lasterror to obtain system error message
1448
1449 // Read system error message into ebuf
1450 // It may or may not be overwritten below (in the for loop and just above)
1451 lasterror(ebuf, (size_t) ebuflen);
1452 ebuf[ebuflen - 1] = '\0';
1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1454 if (fd < 0) {
1455 return NULL;
1456 }
1457
1458 uint32_t signature_offset;
1459 uint16_t lib_arch = 0;
1460 bool failed_to_get_lib_arch =
1461 ( // Go to position 3c in the dll
1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1463 ||
1464 // Read location of signature
1465 (sizeof(signature_offset) !=
1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1467 ||
1468 // Go to COFF File Header in dll
1469 // that is located after "signature" (4 bytes long)
1470 (os::seek_to_file_offset(fd,
1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1472 ||
1473 // Read field that contains code of architecture
1474 // that dll was built for
1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1476 );
1477
1478 ::close(fd);
1479 if (failed_to_get_lib_arch) {
1480 // file i/o error - report os::lasterror(...) msg
1481 return NULL;
1482 }
1483
1484 typedef struct {
1485 uint16_t arch_code;
1486 char* arch_name;
1487 } arch_t;
1488
1489 static const arch_t arch_array[] = {
1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1493 };
1494 #if (defined _M_IA64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1496 #elif (defined _M_AMD64)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1498 #elif (defined _M_IX86)
1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1500 #else
1501 #error Method os::dll_load requires that one of following \
1502 is defined :_M_IA64,_M_AMD64 or _M_IX86
1503 #endif
1504
1505
1506 // Obtain a string for printf operation
1507 // lib_arch_str shall contain string what platform this .dll was built for
1508 // running_arch_str shall string contain what platform Hotspot was built for
1509 char *running_arch_str = NULL, *lib_arch_str = NULL;
1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1511 if (lib_arch == arch_array[i].arch_code) {
1512 lib_arch_str = arch_array[i].arch_name;
1513 }
1514 if (running_arch == arch_array[i].arch_code) {
1515 running_arch_str = arch_array[i].arch_name;
1516 }
1517 }
1518
1519 assert(running_arch_str,
1520 "Didn't find running architecture code in arch_array");
1521
1522 // If the architecture is right
1523 // but some other error took place - report os::lasterror(...) msg
1524 if (lib_arch == running_arch) {
1525 return NULL;
1526 }
1527
1528 if (lib_arch_str != NULL) {
1529 ::_snprintf(ebuf, ebuflen - 1,
1530 "Can't load %s-bit .dll on a %s-bit platform",
1531 lib_arch_str, running_arch_str);
1532 } else {
1533 // don't know what architecture this dll was build for
1534 ::_snprintf(ebuf, ebuflen - 1,
1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1536 lib_arch, running_arch_str);
1537 }
1538
1539 return NULL;
1540 }
1541
1542 void os::print_dll_info(outputStream *st) {
1543 st->print_cr("Dynamic libraries:");
1544 get_loaded_modules_info(_print_module, (void *)st);
1545 }
1546
1547 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1548 HANDLE hProcess;
1549
1550 # define MAX_NUM_MODULES 128
1551 HMODULE modules[MAX_NUM_MODULES];
1552 static char filename[MAX_PATH];
1553 int result = 0;
1554
1555 if (!os::PSApiDll::PSApiAvailable()) {
1556 return 0;
1557 }
1558
1559 int pid = os::current_process_id();
1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1561 FALSE, pid);
1562 if (hProcess == NULL) return 0;
1563
1564 DWORD size_needed;
1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1566 sizeof(modules), &size_needed)) {
1567 CloseHandle(hProcess);
1568 return 0;
1569 }
1570
1571 // number of modules that are currently loaded
1572 int num_modules = size_needed / sizeof(HMODULE);
1573
1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1575 // Get Full pathname:
1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1577 filename, sizeof(filename))) {
1578 filename[0] = '\0';
1579 }
1580
1581 MODULEINFO modinfo;
1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1583 &modinfo, sizeof(modinfo))) {
1584 modinfo.lpBaseOfDll = NULL;
1585 modinfo.SizeOfImage = 0;
1586 }
1587
1588 // Invoke callback function
1589 result = callback(filename, (address)modinfo.lpBaseOfDll,
1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1591 if (result) break;
1592 }
1593
1594 CloseHandle(hProcess);
1595 return result;
1596 }
1597
1598 #ifndef PRODUCT
1599 bool os::get_host_name(char* buf, size_t buflen) {
1600 DWORD size = (DWORD)buflen;
1601 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1602 }
1603 #endif // PRODUCT
1604
1605 void os::get_summary_os_info(char* buf, size_t buflen) {
1606 stringStream sst(buf, buflen);
1607 os::win32::print_windows_version(&sst);
1608 // chop off newline character
1609 char* nl = strchr(buf, '\n');
1610 if (nl != NULL) *nl = '\0';
1611 }
1612
1613 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1614 int ret = vsnprintf(buf, len, fmt, args);
1615 // Get the correct buffer size if buf is too small
1616 if (ret < 0) {
1617 return _vscprintf(fmt, args);
1618 }
1619 return ret;
1620 }
1621
1622 void os::print_os_info_brief(outputStream* st) {
1623 os::print_os_info(st);
1624 }
1625
1626 void os::print_os_info(outputStream* st) {
1627 #ifdef ASSERT
1628 char buffer[1024];
1629 st->print("HostName: ");
1630 if (get_host_name(buffer, sizeof(buffer))) {
1631 st->print("%s ", buffer);
1632 } else {
1633 st->print("N/A ");
1634 }
1635 #endif
1636 st->print("OS:");
1637 os::win32::print_windows_version(st);
1638 }
1639
1640 void os::win32::print_windows_version(outputStream* st) {
1641 OSVERSIONINFOEX osvi;
1642 VS_FIXEDFILEINFO *file_info;
1643 TCHAR kernel32_path[MAX_PATH];
1644 UINT len, ret;
1645
1646 // Use the GetVersionEx information to see if we're on a server or
1647 // workstation edition of Windows. Starting with Windows 8.1 we can't
1648 // trust the OS version information returned by this API.
1649 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1650 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1651 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1652 st->print_cr("Call to GetVersionEx failed");
1653 return;
1654 }
1655 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1656
1657 // Get the full path to \Windows\System32\kernel32.dll and use that for
1658 // determining what version of Windows we're running on.
1659 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1660 ret = GetSystemDirectory(kernel32_path, len);
1661 if (ret == 0 || ret > len) {
1662 st->print_cr("Call to GetSystemDirectory failed");
1663 return;
1664 }
1665 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1666
1667 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1668 if (version_size == 0) {
1669 st->print_cr("Call to GetFileVersionInfoSize failed");
1670 return;
1671 }
1672
1673 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1674 if (version_info == NULL) {
1675 st->print_cr("Failed to allocate version_info");
1676 return;
1677 }
1678
1679 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1680 os::free(version_info);
1681 st->print_cr("Call to GetFileVersionInfo failed");
1682 return;
1683 }
1684
1685 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1686 os::free(version_info);
1687 st->print_cr("Call to VerQueryValue failed");
1688 return;
1689 }
1690
1691 int major_version = HIWORD(file_info->dwProductVersionMS);
1692 int minor_version = LOWORD(file_info->dwProductVersionMS);
1693 int build_number = HIWORD(file_info->dwProductVersionLS);
1694 int build_minor = LOWORD(file_info->dwProductVersionLS);
1695 int os_vers = major_version * 1000 + minor_version;
1696 os::free(version_info);
1697
1698 st->print(" Windows ");
1699 switch (os_vers) {
1700
1701 case 6000:
1702 if (is_workstation) {
1703 st->print("Vista");
1704 } else {
1705 st->print("Server 2008");
1706 }
1707 break;
1708
1709 case 6001:
1710 if (is_workstation) {
1711 st->print("7");
1712 } else {
1713 st->print("Server 2008 R2");
1714 }
1715 break;
1716
1717 case 6002:
1718 if (is_workstation) {
1719 st->print("8");
1720 } else {
1721 st->print("Server 2012");
1722 }
1723 break;
1724
1725 case 6003:
1726 if (is_workstation) {
1727 st->print("8.1");
1728 } else {
1729 st->print("Server 2012 R2");
1730 }
1731 break;
1732
1733 case 10000:
1734 if (is_workstation) {
1735 st->print("10");
1736 } else {
1737 // The server version name of Windows 10 is not known at this time
1738 st->print("%d.%d", major_version, minor_version);
1739 }
1740 break;
1741
1742 default:
1743 // Unrecognized windows, print out its major and minor versions
1744 st->print("%d.%d", major_version, minor_version);
1745 break;
1746 }
1747
1748 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1749 // find out whether we are running on 64 bit processor or not
1750 SYSTEM_INFO si;
1751 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1752 os::Kernel32Dll::GetNativeSystemInfo(&si);
1753 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1754 st->print(" , 64 bit");
1755 }
1756
1757 st->print(" Build %d", build_number);
1758 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1759 st->cr();
1760 }
1761
1762 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1763 // Nothing to do for now.
1764 }
1765
1766 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1767 HKEY key;
1768 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1769 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1770 if (status == ERROR_SUCCESS) {
1771 DWORD size = (DWORD)buflen;
1772 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1773 if (status != ERROR_SUCCESS) {
1774 strncpy(buf, "## __CPU__", buflen);
1775 }
1776 RegCloseKey(key);
1777 } else {
1778 // Put generic cpu info to return
1779 strncpy(buf, "## __CPU__", buflen);
1780 }
1781 }
1782
1783 void os::print_memory_info(outputStream* st) {
1784 st->print("Memory:");
1785 st->print(" %dk page", os::vm_page_size()>>10);
1786
1787 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1788 // value if total memory is larger than 4GB
1789 MEMORYSTATUSEX ms;
1790 ms.dwLength = sizeof(ms);
1791 GlobalMemoryStatusEx(&ms);
1792
1793 st->print(", physical %uk", os::physical_memory() >> 10);
1794 st->print("(%uk free)", os::available_memory() >> 10);
1795
1796 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1797 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1798 st->cr();
1799 }
1800
1801 void os::print_siginfo(outputStream *st, const void* siginfo) {
1802 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1803 st->print("siginfo:");
1804
1805 char tmp[64];
1806 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1807 strcpy(tmp, "EXCEPTION_??");
1808 }
1809 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1810
1811 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1812 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1813 er->NumberParameters >= 2) {
1814 switch (er->ExceptionInformation[0]) {
1815 case 0: st->print(", reading address"); break;
1816 case 1: st->print(", writing address"); break;
1817 case 8: st->print(", data execution prevention violation at address"); break;
1818 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1819 er->ExceptionInformation[0]);
1820 }
1821 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1822 } else {
1823 int num = er->NumberParameters;
1824 if (num > 0) {
1825 st->print(", ExceptionInformation=");
1826 for (int i = 0; i < num; i++) {
1827 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1828 }
1829 }
1830 }
1831 st->cr();
1832 }
1833
1834 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1835 // do nothing
1836 }
1837
1838 static char saved_jvm_path[MAX_PATH] = {0};
1839
1840 // Find the full path to the current module, jvm.dll
1841 void os::jvm_path(char *buf, jint buflen) {
1842 // Error checking.
1843 if (buflen < MAX_PATH) {
1844 assert(false, "must use a large-enough buffer");
1845 buf[0] = '\0';
1846 return;
1847 }
1848 // Lazy resolve the path to current module.
1849 if (saved_jvm_path[0] != 0) {
1850 strcpy(buf, saved_jvm_path);
1851 return;
1852 }
1853
1854 buf[0] = '\0';
1855 if (Arguments::sun_java_launcher_is_altjvm()) {
1856 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1857 // for a JAVA_HOME environment variable and fix up the path so it
1858 // looks like jvm.dll is installed there (append a fake suffix
1859 // hotspot/jvm.dll).
1860 char* java_home_var = ::getenv("JAVA_HOME");
1861 if (java_home_var != NULL && java_home_var[0] != 0 &&
1862 strlen(java_home_var) < (size_t)buflen) {
1863 strncpy(buf, java_home_var, buflen);
1864
1865 // determine if this is a legacy image or modules image
1866 // modules image doesn't have "jre" subdirectory
1867 size_t len = strlen(buf);
1868 char* jrebin_p = buf + len;
1869 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1870 if (0 != _access(buf, 0)) {
1871 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1872 }
1873 len = strlen(buf);
1874 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1875 }
1876 }
1877
1878 if (buf[0] == '\0') {
1879 GetModuleFileName(vm_lib_handle, buf, buflen);
1880 }
1881 strncpy(saved_jvm_path, buf, MAX_PATH);
1882 saved_jvm_path[MAX_PATH - 1] = '\0';
1883 }
1884
1885
1886 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1887 #ifndef _WIN64
1888 st->print("_");
1889 #endif
1890 }
1891
1892
1893 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1894 #ifndef _WIN64
1895 st->print("@%d", args_size * sizeof(int));
1896 #endif
1897 }
1898
1899 // This method is a copy of JDK's sysGetLastErrorString
1900 // from src/windows/hpi/src/system_md.c
1901
1902 size_t os::lasterror(char* buf, size_t len) {
1903 DWORD errval;
1904
1905 if ((errval = GetLastError()) != 0) {
1906 // DOS error
1907 size_t n = (size_t)FormatMessage(
1908 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1909 NULL,
1910 errval,
1911 0,
1912 buf,
1913 (DWORD)len,
1914 NULL);
1915 if (n > 3) {
1916 // Drop final '.', CR, LF
1917 if (buf[n - 1] == '\n') n--;
1918 if (buf[n - 1] == '\r') n--;
1919 if (buf[n - 1] == '.') n--;
1920 buf[n] = '\0';
1921 }
1922 return n;
1923 }
1924
1925 if (errno != 0) {
1926 // C runtime error that has no corresponding DOS error code
1927 const char* s = strerror(errno);
1928 size_t n = strlen(s);
1929 if (n >= len) n = len - 1;
1930 strncpy(buf, s, n);
1931 buf[n] = '\0';
1932 return n;
1933 }
1934
1935 return 0;
1936 }
1937
1938 int os::get_last_error() {
1939 DWORD error = GetLastError();
1940 if (error == 0) {
1941 error = errno;
1942 }
1943 return (int)error;
1944 }
1945
1946 WindowsSemaphore::WindowsSemaphore(uint value) {
1947 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1948
1949 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1950 }
1951
1952 WindowsSemaphore::~WindowsSemaphore() {
1953 ::CloseHandle(_semaphore);
1954 }
1955
1956 void WindowsSemaphore::signal(uint count) {
1957 if (count > 0) {
1958 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1959
1960 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1961 }
1962 }
1963
1964 void WindowsSemaphore::wait() {
1965 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1966 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1967 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1968 }
1969
1970 // sun.misc.Signal
1971 // NOTE that this is a workaround for an apparent kernel bug where if
1972 // a signal handler for SIGBREAK is installed then that signal handler
1973 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1974 // See bug 4416763.
1975 static void (*sigbreakHandler)(int) = NULL;
1976
1977 static void UserHandler(int sig, void *siginfo, void *context) {
1978 os::signal_notify(sig);
1979 // We need to reinstate the signal handler each time...
1980 os::signal(sig, (void*)UserHandler);
1981 }
1982
1983 void* os::user_handler() {
1984 return (void*) UserHandler;
1985 }
1986
1987 void* os::signal(int signal_number, void* handler) {
1988 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1989 void (*oldHandler)(int) = sigbreakHandler;
1990 sigbreakHandler = (void (*)(int)) handler;
1991 return (void*) oldHandler;
1992 } else {
1993 return (void*)::signal(signal_number, (void (*)(int))handler);
1994 }
1995 }
1996
1997 void os::signal_raise(int signal_number) {
1998 raise(signal_number);
1999 }
2000
2001 // The Win32 C runtime library maps all console control events other than ^C
2002 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2003 // logoff, and shutdown events. We therefore install our own console handler
2004 // that raises SIGTERM for the latter cases.
2005 //
2006 static BOOL WINAPI consoleHandler(DWORD event) {
2007 switch (event) {
2008 case CTRL_C_EVENT:
2009 if (is_error_reported()) {
2010 // Ctrl-C is pressed during error reporting, likely because the error
2011 // handler fails to abort. Let VM die immediately.
2012 os::die();
2013 }
2014
2015 os::signal_raise(SIGINT);
2016 return TRUE;
2017 break;
2018 case CTRL_BREAK_EVENT:
2019 if (sigbreakHandler != NULL) {
2020 (*sigbreakHandler)(SIGBREAK);
2021 }
2022 return TRUE;
2023 break;
2024 case CTRL_LOGOFF_EVENT: {
2025 // Don't terminate JVM if it is running in a non-interactive session,
2026 // such as a service process.
2027 USEROBJECTFLAGS flags;
2028 HANDLE handle = GetProcessWindowStation();
2029 if (handle != NULL &&
2030 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2031 sizeof(USEROBJECTFLAGS), NULL)) {
2032 // If it is a non-interactive session, let next handler to deal
2033 // with it.
2034 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2035 return FALSE;
2036 }
2037 }
2038 }
2039 case CTRL_CLOSE_EVENT:
2040 case CTRL_SHUTDOWN_EVENT:
2041 os::signal_raise(SIGTERM);
2042 return TRUE;
2043 break;
2044 default:
2045 break;
2046 }
2047 return FALSE;
2048 }
2049
2050 // The following code is moved from os.cpp for making this
2051 // code platform specific, which it is by its very nature.
2052
2053 // Return maximum OS signal used + 1 for internal use only
2054 // Used as exit signal for signal_thread
2055 int os::sigexitnum_pd() {
2056 return NSIG;
2057 }
2058
2059 // a counter for each possible signal value, including signal_thread exit signal
2060 static volatile jint pending_signals[NSIG+1] = { 0 };
2061 static HANDLE sig_sem = NULL;
2062
2063 void os::signal_init_pd() {
2064 // Initialize signal structures
2065 memset((void*)pending_signals, 0, sizeof(pending_signals));
2066
2067 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2068
2069 // Programs embedding the VM do not want it to attempt to receive
2070 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2071 // shutdown hooks mechanism introduced in 1.3. For example, when
2072 // the VM is run as part of a Windows NT service (i.e., a servlet
2073 // engine in a web server), the correct behavior is for any console
2074 // control handler to return FALSE, not TRUE, because the OS's
2075 // "final" handler for such events allows the process to continue if
2076 // it is a service (while terminating it if it is not a service).
2077 // To make this behavior uniform and the mechanism simpler, we
2078 // completely disable the VM's usage of these console events if -Xrs
2079 // (=ReduceSignalUsage) is specified. This means, for example, that
2080 // the CTRL-BREAK thread dump mechanism is also disabled in this
2081 // case. See bugs 4323062, 4345157, and related bugs.
2082
2083 if (!ReduceSignalUsage) {
2084 // Add a CTRL-C handler
2085 SetConsoleCtrlHandler(consoleHandler, TRUE);
2086 }
2087 }
2088
2089 void os::signal_notify(int signal_number) {
2090 BOOL ret;
2091 if (sig_sem != NULL) {
2092 Atomic::inc(&pending_signals[signal_number]);
2093 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2094 assert(ret != 0, "ReleaseSemaphore() failed");
2095 }
2096 }
2097
2098 static int check_pending_signals(bool wait_for_signal) {
2099 DWORD ret;
2100 while (true) {
2101 for (int i = 0; i < NSIG + 1; i++) {
2102 jint n = pending_signals[i];
2103 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2104 return i;
2105 }
2106 }
2107 if (!wait_for_signal) {
2108 return -1;
2109 }
2110
2111 JavaThread *thread = JavaThread::current();
2112
2113 ThreadBlockInVM tbivm(thread);
2114
2115 bool threadIsSuspended;
2116 do {
2117 thread->set_suspend_equivalent();
2118 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2119 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2120 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2121
2122 // were we externally suspended while we were waiting?
2123 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2124 if (threadIsSuspended) {
2125 // The semaphore has been incremented, but while we were waiting
2126 // another thread suspended us. We don't want to continue running
2127 // while suspended because that would surprise the thread that
2128 // suspended us.
2129 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2130 assert(ret != 0, "ReleaseSemaphore() failed");
2131
2132 thread->java_suspend_self();
2133 }
2134 } while (threadIsSuspended);
2135 }
2136 }
2137
2138 int os::signal_lookup() {
2139 return check_pending_signals(false);
2140 }
2141
2142 int os::signal_wait() {
2143 return check_pending_signals(true);
2144 }
2145
2146 // Implicit OS exception handling
2147
2148 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2149 address handler) {
2150 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2151 // Save pc in thread
2152 #ifdef _M_IA64
2153 // Do not blow up if no thread info available.
2154 if (thread) {
2155 // Saving PRECISE pc (with slot information) in thread.
2156 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2157 // Convert precise PC into "Unix" format
2158 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2159 thread->set_saved_exception_pc((address)precise_pc);
2160 }
2161 // Set pc to handler
2162 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2163 // Clear out psr.ri (= Restart Instruction) in order to continue
2164 // at the beginning of the target bundle.
2165 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2166 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2167 #else
2168 #ifdef _M_AMD64
2169 // Do not blow up if no thread info available.
2170 if (thread) {
2171 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2172 }
2173 // Set pc to handler
2174 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2175 #else
2176 // Do not blow up if no thread info available.
2177 if (thread) {
2178 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2179 }
2180 // Set pc to handler
2181 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2182 #endif
2183 #endif
2184
2185 // Continue the execution
2186 return EXCEPTION_CONTINUE_EXECUTION;
2187 }
2188
2189
2190 // Used for PostMortemDump
2191 extern "C" void safepoints();
2192 extern "C" void find(int x);
2193 extern "C" void events();
2194
2195 // According to Windows API documentation, an illegal instruction sequence should generate
2196 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2197 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2198 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2199
2200 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2201
2202 // From "Execution Protection in the Windows Operating System" draft 0.35
2203 // Once a system header becomes available, the "real" define should be
2204 // included or copied here.
2205 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2206
2207 // Handle NAT Bit consumption on IA64.
2208 #ifdef _M_IA64
2209 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2210 #endif
2211
2212 // Windows Vista/2008 heap corruption check
2213 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2214
2215 #define def_excpt(val) #val, val
2216
2217 struct siglabel {
2218 char *name;
2219 int number;
2220 };
2221
2222 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2223 // C++ compiler contain this error code. Because this is a compiler-generated
2224 // error, the code is not listed in the Win32 API header files.
2225 // The code is actually a cryptic mnemonic device, with the initial "E"
2226 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2227 // ASCII values of "msc".
2228
2229 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2230
2231
2232 struct siglabel exceptlabels[] = {
2233 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2234 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2235 def_excpt(EXCEPTION_BREAKPOINT),
2236 def_excpt(EXCEPTION_SINGLE_STEP),
2237 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2238 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2239 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2240 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2241 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2242 def_excpt(EXCEPTION_FLT_OVERFLOW),
2243 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2244 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2245 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2246 def_excpt(EXCEPTION_INT_OVERFLOW),
2247 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2248 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2249 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2250 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2251 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2252 def_excpt(EXCEPTION_STACK_OVERFLOW),
2253 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2254 def_excpt(EXCEPTION_GUARD_PAGE),
2255 def_excpt(EXCEPTION_INVALID_HANDLE),
2256 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2257 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2258 #ifdef _M_IA64
2259 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2260 #endif
2261 NULL, 0
2262 };
2263
2264 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2265 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2266 if (exceptlabels[i].number == exception_code) {
2267 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2268 return buf;
2269 }
2270 }
2271
2272 return NULL;
2273 }
2274
2275 //-----------------------------------------------------------------------------
2276 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2277 // handle exception caused by idiv; should only happen for -MinInt/-1
2278 // (division by zero is handled explicitly)
2279 #ifdef _M_IA64
2280 assert(0, "Fix Handle_IDiv_Exception");
2281 #else
2282 #ifdef _M_AMD64
2283 PCONTEXT ctx = exceptionInfo->ContextRecord;
2284 address pc = (address)ctx->Rip;
2285 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2286 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2287 if (pc[0] == 0xF7) {
2288 // set correct result values and continue after idiv instruction
2289 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2290 } else {
2291 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2292 }
2293 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2294 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2295 // idiv opcode (0xF7).
2296 ctx->Rdx = (DWORD)0; // remainder
2297 // Continue the execution
2298 #else
2299 PCONTEXT ctx = exceptionInfo->ContextRecord;
2300 address pc = (address)ctx->Eip;
2301 assert(pc[0] == 0xF7, "not an idiv opcode");
2302 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2303 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2304 // set correct result values and continue after idiv instruction
2305 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2306 ctx->Eax = (DWORD)min_jint; // result
2307 ctx->Edx = (DWORD)0; // remainder
2308 // Continue the execution
2309 #endif
2310 #endif
2311 return EXCEPTION_CONTINUE_EXECUTION;
2312 }
2313
2314 //-----------------------------------------------------------------------------
2315 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2316 PCONTEXT ctx = exceptionInfo->ContextRecord;
2317 #ifndef _WIN64
2318 // handle exception caused by native method modifying control word
2319 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2320
2321 switch (exception_code) {
2322 case EXCEPTION_FLT_DENORMAL_OPERAND:
2323 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2324 case EXCEPTION_FLT_INEXACT_RESULT:
2325 case EXCEPTION_FLT_INVALID_OPERATION:
2326 case EXCEPTION_FLT_OVERFLOW:
2327 case EXCEPTION_FLT_STACK_CHECK:
2328 case EXCEPTION_FLT_UNDERFLOW:
2329 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2330 if (fp_control_word != ctx->FloatSave.ControlWord) {
2331 // Restore FPCW and mask out FLT exceptions
2332 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2333 // Mask out pending FLT exceptions
2334 ctx->FloatSave.StatusWord &= 0xffffff00;
2335 return EXCEPTION_CONTINUE_EXECUTION;
2336 }
2337 }
2338
2339 if (prev_uef_handler != NULL) {
2340 // We didn't handle this exception so pass it to the previous
2341 // UnhandledExceptionFilter.
2342 return (prev_uef_handler)(exceptionInfo);
2343 }
2344 #else // !_WIN64
2345 // On Windows, the mxcsr control bits are non-volatile across calls
2346 // See also CR 6192333
2347 //
2348 jint MxCsr = INITIAL_MXCSR;
2349 // we can't use StubRoutines::addr_mxcsr_std()
2350 // because in Win64 mxcsr is not saved there
2351 if (MxCsr != ctx->MxCsr) {
2352 ctx->MxCsr = MxCsr;
2353 return EXCEPTION_CONTINUE_EXECUTION;
2354 }
2355 #endif // !_WIN64
2356
2357 return EXCEPTION_CONTINUE_SEARCH;
2358 }
2359
2360 static inline void report_error(Thread* t, DWORD exception_code,
2361 address addr, void* siginfo, void* context) {
2362 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2363
2364 // If UseOsErrorReporting, this will return here and save the error file
2365 // somewhere where we can find it in the minidump.
2366 }
2367
2368 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2369 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2370 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2371 address addr = (address) exceptionRecord->ExceptionInformation[1];
2372 if (Interpreter::contains(pc)) {
2373 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2374 if (!fr->is_first_java_frame()) {
2375 assert(fr->safe_for_sender(thread), "Safety check");
2376 *fr = fr->java_sender();
2377 }
2378 } else {
2379 // more complex code with compiled code
2380 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2381 CodeBlob* cb = CodeCache::find_blob(pc);
2382 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2383 // Not sure where the pc points to, fallback to default
2384 // stack overflow handling
2385 return false;
2386 } else {
2387 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2388 // in compiled code, the stack banging is performed just after the return pc
2389 // has been pushed on the stack
2390 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2391 if (!fr->is_java_frame()) {
2392 assert(fr->safe_for_sender(thread), "Safety check");
2393 *fr = fr->java_sender();
2394 }
2395 }
2396 }
2397 assert(fr->is_java_frame(), "Safety check");
2398 return true;
2399 }
2400
2401 //-----------------------------------------------------------------------------
2402 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2403 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2404 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2405 #ifdef _M_IA64
2406 // On Itanium, we need the "precise pc", which has the slot number coded
2407 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2408 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2409 // Convert the pc to "Unix format", which has the slot number coded
2410 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2411 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2412 // information is saved in the Unix format.
2413 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2414 #else
2415 #ifdef _M_AMD64
2416 address pc = (address) exceptionInfo->ContextRecord->Rip;
2417 #else
2418 address pc = (address) exceptionInfo->ContextRecord->Eip;
2419 #endif
2420 #endif
2421 Thread* t = Thread::current_or_null_safe();
2422
2423 // Handle SafeFetch32 and SafeFetchN exceptions.
2424 if (StubRoutines::is_safefetch_fault(pc)) {
2425 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2426 }
2427
2428 #ifndef _WIN64
2429 // Execution protection violation - win32 running on AMD64 only
2430 // Handled first to avoid misdiagnosis as a "normal" access violation;
2431 // This is safe to do because we have a new/unique ExceptionInformation
2432 // code for this condition.
2433 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2434 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2435 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2436 address addr = (address) exceptionRecord->ExceptionInformation[1];
2437
2438 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2439 int page_size = os::vm_page_size();
2440
2441 // Make sure the pc and the faulting address are sane.
2442 //
2443 // If an instruction spans a page boundary, and the page containing
2444 // the beginning of the instruction is executable but the following
2445 // page is not, the pc and the faulting address might be slightly
2446 // different - we still want to unguard the 2nd page in this case.
2447 //
2448 // 15 bytes seems to be a (very) safe value for max instruction size.
2449 bool pc_is_near_addr =
2450 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2451 bool instr_spans_page_boundary =
2452 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2453 (intptr_t) page_size) > 0);
2454
2455 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2456 static volatile address last_addr =
2457 (address) os::non_memory_address_word();
2458
2459 // In conservative mode, don't unguard unless the address is in the VM
2460 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2461 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2462
2463 // Set memory to RWX and retry
2464 address page_start =
2465 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2466 bool res = os::protect_memory((char*) page_start, page_size,
2467 os::MEM_PROT_RWX);
2468
2469 if (PrintMiscellaneous && Verbose) {
2470 char buf[256];
2471 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2472 "at " INTPTR_FORMAT
2473 ", unguarding " INTPTR_FORMAT ": %s", addr,
2474 page_start, (res ? "success" : strerror(errno)));
2475 tty->print_raw_cr(buf);
2476 }
2477
2478 // Set last_addr so if we fault again at the same address, we don't
2479 // end up in an endless loop.
2480 //
2481 // There are two potential complications here. Two threads trapping
2482 // at the same address at the same time could cause one of the
2483 // threads to think it already unguarded, and abort the VM. Likely
2484 // very rare.
2485 //
2486 // The other race involves two threads alternately trapping at
2487 // different addresses and failing to unguard the page, resulting in
2488 // an endless loop. This condition is probably even more unlikely
2489 // than the first.
2490 //
2491 // Although both cases could be avoided by using locks or thread
2492 // local last_addr, these solutions are unnecessary complication:
2493 // this handler is a best-effort safety net, not a complete solution.
2494 // It is disabled by default and should only be used as a workaround
2495 // in case we missed any no-execute-unsafe VM code.
2496
2497 last_addr = addr;
2498
2499 return EXCEPTION_CONTINUE_EXECUTION;
2500 }
2501 }
2502
2503 // Last unguard failed or not unguarding
2504 tty->print_raw_cr("Execution protection violation");
2505 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2506 exceptionInfo->ContextRecord);
2507 return EXCEPTION_CONTINUE_SEARCH;
2508 }
2509 }
2510 #endif // _WIN64
2511
2512 // Check to see if we caught the safepoint code in the
2513 // process of write protecting the memory serialization page.
2514 // It write enables the page immediately after protecting it
2515 // so just return.
2516 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2517 JavaThread* thread = (JavaThread*) t;
2518 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2519 address addr = (address) exceptionRecord->ExceptionInformation[1];
2520 if (os::is_memory_serialize_page(thread, addr)) {
2521 // Block current thread until the memory serialize page permission restored.
2522 os::block_on_serialize_page_trap();
2523 return EXCEPTION_CONTINUE_EXECUTION;
2524 }
2525 }
2526
2527 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2528 VM_Version::is_cpuinfo_segv_addr(pc)) {
2529 // Verify that OS save/restore AVX registers.
2530 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2531 }
2532
2533 if (t != NULL && t->is_Java_thread()) {
2534 JavaThread* thread = (JavaThread*) t;
2535 bool in_java = thread->thread_state() == _thread_in_Java;
2536
2537 // Handle potential stack overflows up front.
2538 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2539 if (os::uses_stack_guard_pages()) {
2540 #ifdef _M_IA64
2541 // Use guard page for register stack.
2542 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2543 address addr = (address) exceptionRecord->ExceptionInformation[1];
2544 // Check for a register stack overflow on Itanium
2545 if (thread->addr_inside_register_stack_red_zone(addr)) {
2546 // Fatal red zone violation happens if the Java program
2547 // catches a StackOverflow error and does so much processing
2548 // that it runs beyond the unprotected yellow guard zone. As
2549 // a result, we are out of here.
2550 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2551 } else if(thread->addr_inside_register_stack(addr)) {
2552 // Disable the yellow zone which sets the state that
2553 // we've got a stack overflow problem.
2554 if (thread->stack_yellow_zone_enabled()) {
2555 thread->disable_stack_yellow_zone();
2556 }
2557 // Give us some room to process the exception.
2558 thread->disable_register_stack_guard();
2559 // Tracing with +Verbose.
2560 if (Verbose) {
2561 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2562 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2563 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2564 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2565 thread->register_stack_base(),
2566 thread->register_stack_base() + thread->stack_size());
2567 }
2568
2569 // Reguard the permanent register stack red zone just to be sure.
2570 // We saw Windows silently disabling this without telling us.
2571 thread->enable_register_stack_red_zone();
2572
2573 return Handle_Exception(exceptionInfo,
2574 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2575 }
2576 #endif
2577 if (thread->stack_guards_enabled()) {
2578 if (_thread_in_Java) {
2579 frame fr;
2580 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2581 address addr = (address) exceptionRecord->ExceptionInformation[1];
2582 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2583 assert(fr.is_java_frame(), "Must be a Java frame");
2584 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2585 }
2586 }
2587 // Yellow zone violation. The o/s has unprotected the first yellow
2588 // zone page for us. Note: must call disable_stack_yellow_zone to
2589 // update the enabled status, even if the zone contains only one page.
2590 thread->disable_stack_yellow_zone();
2591 // If not in java code, return and hope for the best.
2592 return in_java
2593 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2594 : EXCEPTION_CONTINUE_EXECUTION;
2595 } else {
2596 // Fatal red zone violation.
2597 thread->disable_stack_red_zone();
2598 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2599 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2600 exceptionInfo->ContextRecord);
2601 return EXCEPTION_CONTINUE_SEARCH;
2602 }
2603 } else if (in_java) {
2604 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2605 // a one-time-only guard page, which it has released to us. The next
2606 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2607 return Handle_Exception(exceptionInfo,
2608 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2609 } else {
2610 // Can only return and hope for the best. Further stack growth will
2611 // result in an ACCESS_VIOLATION.
2612 return EXCEPTION_CONTINUE_EXECUTION;
2613 }
2614 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2615 // Either stack overflow or null pointer exception.
2616 if (in_java) {
2617 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2618 address addr = (address) exceptionRecord->ExceptionInformation[1];
2619 address stack_end = thread->stack_base() - thread->stack_size();
2620 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2621 // Stack overflow.
2622 assert(!os::uses_stack_guard_pages(),
2623 "should be caught by red zone code above.");
2624 return Handle_Exception(exceptionInfo,
2625 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2626 }
2627 // Check for safepoint polling and implicit null
2628 // We only expect null pointers in the stubs (vtable)
2629 // the rest are checked explicitly now.
2630 CodeBlob* cb = CodeCache::find_blob(pc);
2631 if (cb != NULL) {
2632 if (os::is_poll_address(addr)) {
2633 address stub = SharedRuntime::get_poll_stub(pc);
2634 return Handle_Exception(exceptionInfo, stub);
2635 }
2636 }
2637 {
2638 #ifdef _WIN64
2639 // If it's a legal stack address map the entire region in
2640 //
2641 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2642 address addr = (address) exceptionRecord->ExceptionInformation[1];
2643 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2644 addr = (address)((uintptr_t)addr &
2645 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2646 os::commit_memory((char *)addr, thread->stack_base() - addr,
2647 !ExecMem);
2648 return EXCEPTION_CONTINUE_EXECUTION;
2649 } else
2650 #endif
2651 {
2652 // Null pointer exception.
2653 #ifdef _M_IA64
2654 // Process implicit null checks in compiled code. Note: Implicit null checks
2655 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2656 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2657 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2658 // Handle implicit null check in UEP method entry
2659 if (cb && (cb->is_frame_complete_at(pc) ||
2660 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2661 if (Verbose) {
2662 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2663 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2664 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2665 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2666 *(bundle_start + 1), *bundle_start);
2667 }
2668 return Handle_Exception(exceptionInfo,
2669 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2670 }
2671 }
2672
2673 // Implicit null checks were processed above. Hence, we should not reach
2674 // here in the usual case => die!
2675 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2676 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2677 exceptionInfo->ContextRecord);
2678 return EXCEPTION_CONTINUE_SEARCH;
2679
2680 #else // !IA64
2681
2682 // Windows 98 reports faulting addresses incorrectly
2683 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2684 !os::win32::is_nt()) {
2685 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2686 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2687 }
2688 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2689 exceptionInfo->ContextRecord);
2690 return EXCEPTION_CONTINUE_SEARCH;
2691 #endif
2692 }
2693 }
2694 }
2695
2696 #ifdef _WIN64
2697 // Special care for fast JNI field accessors.
2698 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2699 // in and the heap gets shrunk before the field access.
2700 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2701 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2702 if (addr != (address)-1) {
2703 return Handle_Exception(exceptionInfo, addr);
2704 }
2705 }
2706 #endif
2707
2708 // Stack overflow or null pointer exception in native code.
2709 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2710 exceptionInfo->ContextRecord);
2711 return EXCEPTION_CONTINUE_SEARCH;
2712 } // /EXCEPTION_ACCESS_VIOLATION
2713 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2714 #if defined _M_IA64
2715 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2716 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2717 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2718
2719 // Compiled method patched to be non entrant? Following conditions must apply:
2720 // 1. must be first instruction in bundle
2721 // 2. must be a break instruction with appropriate code
2722 if ((((uint64_t) pc & 0x0F) == 0) &&
2723 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2724 return Handle_Exception(exceptionInfo,
2725 (address)SharedRuntime::get_handle_wrong_method_stub());
2726 }
2727 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2728 #endif
2729
2730
2731 if (in_java) {
2732 switch (exception_code) {
2733 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2734 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2735
2736 case EXCEPTION_INT_OVERFLOW:
2737 return Handle_IDiv_Exception(exceptionInfo);
2738
2739 } // switch
2740 }
2741 if (((thread->thread_state() == _thread_in_Java) ||
2742 (thread->thread_state() == _thread_in_native)) &&
2743 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2744 LONG result=Handle_FLT_Exception(exceptionInfo);
2745 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2746 }
2747 }
2748
2749 if (exception_code != EXCEPTION_BREAKPOINT) {
2750 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2751 exceptionInfo->ContextRecord);
2752 }
2753 return EXCEPTION_CONTINUE_SEARCH;
2754 }
2755
2756 #ifndef _WIN64
2757 // Special care for fast JNI accessors.
2758 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2759 // the heap gets shrunk before the field access.
2760 // Need to install our own structured exception handler since native code may
2761 // install its own.
2762 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2763 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2764 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2765 address pc = (address) exceptionInfo->ContextRecord->Eip;
2766 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2767 if (addr != (address)-1) {
2768 return Handle_Exception(exceptionInfo, addr);
2769 }
2770 }
2771 return EXCEPTION_CONTINUE_SEARCH;
2772 }
2773
2774 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2775 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2776 jobject obj, \
2777 jfieldID fieldID) { \
2778 __try { \
2779 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2780 obj, \
2781 fieldID); \
2782 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2783 _exception_info())) { \
2784 } \
2785 return 0; \
2786 }
2787
2788 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2789 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2790 DEFINE_FAST_GETFIELD(jchar, char, Char)
2791 DEFINE_FAST_GETFIELD(jshort, short, Short)
2792 DEFINE_FAST_GETFIELD(jint, int, Int)
2793 DEFINE_FAST_GETFIELD(jlong, long, Long)
2794 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2795 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2796
2797 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2798 switch (type) {
2799 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2800 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2801 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2802 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2803 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2804 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2805 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2806 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2807 default: ShouldNotReachHere();
2808 }
2809 return (address)-1;
2810 }
2811 #endif
2812
2813 // Virtual Memory
2814
2815 int os::vm_page_size() { return os::win32::vm_page_size(); }
2816 int os::vm_allocation_granularity() {
2817 return os::win32::vm_allocation_granularity();
2818 }
2819
2820 // Windows large page support is available on Windows 2003. In order to use
2821 // large page memory, the administrator must first assign additional privilege
2822 // to the user:
2823 // + select Control Panel -> Administrative Tools -> Local Security Policy
2824 // + select Local Policies -> User Rights Assignment
2825 // + double click "Lock pages in memory", add users and/or groups
2826 // + reboot
2827 // Note the above steps are needed for administrator as well, as administrators
2828 // by default do not have the privilege to lock pages in memory.
2829 //
2830 // Note about Windows 2003: although the API supports committing large page
2831 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2832 // scenario, I found through experiment it only uses large page if the entire
2833 // memory region is reserved and committed in a single VirtualAlloc() call.
2834 // This makes Windows large page support more or less like Solaris ISM, in
2835 // that the entire heap must be committed upfront. This probably will change
2836 // in the future, if so the code below needs to be revisited.
2837
2838 #ifndef MEM_LARGE_PAGES
2839 #define MEM_LARGE_PAGES 0x20000000
2840 #endif
2841
2842 static HANDLE _hProcess;
2843 static HANDLE _hToken;
2844
2845 // Container for NUMA node list info
2846 class NUMANodeListHolder {
2847 private:
2848 int *_numa_used_node_list; // allocated below
2849 int _numa_used_node_count;
2850
2851 void free_node_list() {
2852 if (_numa_used_node_list != NULL) {
2853 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2854 }
2855 }
2856
2857 public:
2858 NUMANodeListHolder() {
2859 _numa_used_node_count = 0;
2860 _numa_used_node_list = NULL;
2861 // do rest of initialization in build routine (after function pointers are set up)
2862 }
2863
2864 ~NUMANodeListHolder() {
2865 free_node_list();
2866 }
2867
2868 bool build() {
2869 DWORD_PTR proc_aff_mask;
2870 DWORD_PTR sys_aff_mask;
2871 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2872 ULONG highest_node_number;
2873 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2874 free_node_list();
2875 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2876 for (unsigned int i = 0; i <= highest_node_number; i++) {
2877 ULONGLONG proc_mask_numa_node;
2878 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2879 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2880 _numa_used_node_list[_numa_used_node_count++] = i;
2881 }
2882 }
2883 return (_numa_used_node_count > 1);
2884 }
2885
2886 int get_count() { return _numa_used_node_count; }
2887 int get_node_list_entry(int n) {
2888 // for indexes out of range, returns -1
2889 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2890 }
2891
2892 } numa_node_list_holder;
2893
2894
2895
2896 static size_t _large_page_size = 0;
2897
2898 static bool resolve_functions_for_large_page_init() {
2899 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2900 os::Advapi32Dll::AdvapiAvailable();
2901 }
2902
2903 static bool request_lock_memory_privilege() {
2904 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2905 os::current_process_id());
2906
2907 LUID luid;
2908 if (_hProcess != NULL &&
2909 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2910 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2911
2912 TOKEN_PRIVILEGES tp;
2913 tp.PrivilegeCount = 1;
2914 tp.Privileges[0].Luid = luid;
2915 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2916
2917 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2918 // privilege. Check GetLastError() too. See MSDN document.
2919 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2920 (GetLastError() == ERROR_SUCCESS)) {
2921 return true;
2922 }
2923 }
2924
2925 return false;
2926 }
2927
2928 static void cleanup_after_large_page_init() {
2929 if (_hProcess) CloseHandle(_hProcess);
2930 _hProcess = NULL;
2931 if (_hToken) CloseHandle(_hToken);
2932 _hToken = NULL;
2933 }
2934
2935 static bool numa_interleaving_init() {
2936 bool success = false;
2937 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2938
2939 // print a warning if UseNUMAInterleaving flag is specified on command line
2940 bool warn_on_failure = use_numa_interleaving_specified;
2941 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2942
2943 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2944 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2945 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2946
2947 if (os::Kernel32Dll::NumaCallsAvailable()) {
2948 if (numa_node_list_holder.build()) {
2949 if (PrintMiscellaneous && Verbose) {
2950 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2951 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2952 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2953 }
2954 tty->print("\n");
2955 }
2956 success = true;
2957 } else {
2958 WARN("Process does not cover multiple NUMA nodes.");
2959 }
2960 } else {
2961 WARN("NUMA Interleaving is not supported by the operating system.");
2962 }
2963 if (!success) {
2964 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2965 }
2966 return success;
2967 #undef WARN
2968 }
2969
2970 // this routine is used whenever we need to reserve a contiguous VA range
2971 // but we need to make separate VirtualAlloc calls for each piece of the range
2972 // Reasons for doing this:
2973 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2974 // * UseNUMAInterleaving requires a separate node for each piece
2975 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2976 DWORD prot,
2977 bool should_inject_error = false) {
2978 char * p_buf;
2979 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2980 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2981 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2982
2983 // first reserve enough address space in advance since we want to be
2984 // able to break a single contiguous virtual address range into multiple
2985 // large page commits but WS2003 does not allow reserving large page space
2986 // so we just use 4K pages for reserve, this gives us a legal contiguous
2987 // address space. then we will deallocate that reservation, and re alloc
2988 // using large pages
2989 const size_t size_of_reserve = bytes + chunk_size;
2990 if (bytes > size_of_reserve) {
2991 // Overflowed.
2992 return NULL;
2993 }
2994 p_buf = (char *) VirtualAlloc(addr,
2995 size_of_reserve, // size of Reserve
2996 MEM_RESERVE,
2997 PAGE_READWRITE);
2998 // If reservation failed, return NULL
2999 if (p_buf == NULL) return NULL;
3000 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
3001 os::release_memory(p_buf, bytes + chunk_size);
3002
3003 // we still need to round up to a page boundary (in case we are using large pages)
3004 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
3005 // instead we handle this in the bytes_to_rq computation below
3006 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
3007
3008 // now go through and allocate one chunk at a time until all bytes are
3009 // allocated
3010 size_t bytes_remaining = bytes;
3011 // An overflow of align_size_up() would have been caught above
3012 // in the calculation of size_of_reserve.
3013 char * next_alloc_addr = p_buf;
3014 HANDLE hProc = GetCurrentProcess();
3015
3016 #ifdef ASSERT
3017 // Variable for the failure injection
3018 long ran_num = os::random();
3019 size_t fail_after = ran_num % bytes;
3020 #endif
3021
3022 int count=0;
3023 while (bytes_remaining) {
3024 // select bytes_to_rq to get to the next chunk_size boundary
3025
3026 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3027 // Note allocate and commit
3028 char * p_new;
3029
3030 #ifdef ASSERT
3031 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3032 #else
3033 const bool inject_error_now = false;
3034 #endif
3035
3036 if (inject_error_now) {
3037 p_new = NULL;
3038 } else {
3039 if (!UseNUMAInterleaving) {
3040 p_new = (char *) VirtualAlloc(next_alloc_addr,
3041 bytes_to_rq,
3042 flags,
3043 prot);
3044 } else {
3045 // get the next node to use from the used_node_list
3046 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3047 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3048 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3049 next_alloc_addr,
3050 bytes_to_rq,
3051 flags,
3052 prot,
3053 node);
3054 }
3055 }
3056
3057 if (p_new == NULL) {
3058 // Free any allocated pages
3059 if (next_alloc_addr > p_buf) {
3060 // Some memory was committed so release it.
3061 size_t bytes_to_release = bytes - bytes_remaining;
3062 // NMT has yet to record any individual blocks, so it
3063 // need to create a dummy 'reserve' record to match
3064 // the release.
3065 MemTracker::record_virtual_memory_reserve((address)p_buf,
3066 bytes_to_release, CALLER_PC);
3067 os::release_memory(p_buf, bytes_to_release);
3068 }
3069 #ifdef ASSERT
3070 if (should_inject_error) {
3071 if (TracePageSizes && Verbose) {
3072 tty->print_cr("Reserving pages individually failed.");
3073 }
3074 }
3075 #endif
3076 return NULL;
3077 }
3078
3079 bytes_remaining -= bytes_to_rq;
3080 next_alloc_addr += bytes_to_rq;
3081 count++;
3082 }
3083 // Although the memory is allocated individually, it is returned as one.
3084 // NMT records it as one block.
3085 if ((flags & MEM_COMMIT) != 0) {
3086 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3087 } else {
3088 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3089 }
3090
3091 // made it this far, success
3092 return p_buf;
3093 }
3094
3095
3096
3097 void os::large_page_init() {
3098 if (!UseLargePages) return;
3099
3100 // print a warning if any large page related flag is specified on command line
3101 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3102 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3103 bool success = false;
3104
3105 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3106 if (resolve_functions_for_large_page_init()) {
3107 if (request_lock_memory_privilege()) {
3108 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3109 if (s) {
3110 #if defined(IA32) || defined(AMD64)
3111 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3112 WARN("JVM cannot use large pages bigger than 4mb.");
3113 } else {
3114 #endif
3115 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3116 _large_page_size = LargePageSizeInBytes;
3117 } else {
3118 _large_page_size = s;
3119 }
3120 success = true;
3121 #if defined(IA32) || defined(AMD64)
3122 }
3123 #endif
3124 } else {
3125 WARN("Large page is not supported by the processor.");
3126 }
3127 } else {
3128 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3129 }
3130 } else {
3131 WARN("Large page is not supported by the operating system.");
3132 }
3133 #undef WARN
3134
3135 const size_t default_page_size = (size_t) vm_page_size();
3136 if (success && _large_page_size > default_page_size) {
3137 _page_sizes[0] = _large_page_size;
3138 _page_sizes[1] = default_page_size;
3139 _page_sizes[2] = 0;
3140 }
3141
3142 cleanup_after_large_page_init();
3143 UseLargePages = success;
3144 }
3145
3146 // On win32, one cannot release just a part of reserved memory, it's an
3147 // all or nothing deal. When we split a reservation, we must break the
3148 // reservation into two reservations.
3149 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3150 bool realloc) {
3151 if (size > 0) {
3152 release_memory(base, size);
3153 if (realloc) {
3154 reserve_memory(split, base);
3155 }
3156 if (size != split) {
3157 reserve_memory(size - split, base + split);
3158 }
3159 }
3160 }
3161
3162 // Multiple threads can race in this code but it's not possible to unmap small sections of
3163 // virtual space to get requested alignment, like posix-like os's.
3164 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3165 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3166 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3167 "Alignment must be a multiple of allocation granularity (page size)");
3168 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3169
3170 size_t extra_size = size + alignment;
3171 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3172
3173 char* aligned_base = NULL;
3174
3175 do {
3176 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3177 if (extra_base == NULL) {
3178 return NULL;
3179 }
3180 // Do manual alignment
3181 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3182
3183 os::release_memory(extra_base, extra_size);
3184
3185 aligned_base = os::reserve_memory(size, aligned_base);
3186
3187 } while (aligned_base == NULL);
3188
3189 return aligned_base;
3190 }
3191
3192 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3193 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3194 "reserve alignment");
3195 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3196 char* res;
3197 // note that if UseLargePages is on, all the areas that require interleaving
3198 // will go thru reserve_memory_special rather than thru here.
3199 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3200 if (!use_individual) {
3201 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3202 } else {
3203 elapsedTimer reserveTimer;
3204 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3205 // in numa interleaving, we have to allocate pages individually
3206 // (well really chunks of NUMAInterleaveGranularity size)
3207 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3208 if (res == NULL) {
3209 warning("NUMA page allocation failed");
3210 }
3211 if (Verbose && PrintMiscellaneous) {
3212 reserveTimer.stop();
3213 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3214 reserveTimer.milliseconds(), reserveTimer.ticks());
3215 }
3216 }
3217 assert(res == NULL || addr == NULL || addr == res,
3218 "Unexpected address from reserve.");
3219
3220 return res;
3221 }
3222
3223 // Reserve memory at an arbitrary address, only if that area is
3224 // available (and not reserved for something else).
3225 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3226 // Windows os::reserve_memory() fails of the requested address range is
3227 // not avilable.
3228 return reserve_memory(bytes, requested_addr);
3229 }
3230
3231 size_t os::large_page_size() {
3232 return _large_page_size;
3233 }
3234
3235 bool os::can_commit_large_page_memory() {
3236 // Windows only uses large page memory when the entire region is reserved
3237 // and committed in a single VirtualAlloc() call. This may change in the
3238 // future, but with Windows 2003 it's not possible to commit on demand.
3239 return false;
3240 }
3241
3242 bool os::can_execute_large_page_memory() {
3243 return true;
3244 }
3245
3246 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3247 bool exec) {
3248 assert(UseLargePages, "only for large pages");
3249
3250 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3251 return NULL; // Fallback to small pages.
3252 }
3253
3254 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3255 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3256
3257 // with large pages, there are two cases where we need to use Individual Allocation
3258 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3259 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3260 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3261 if (TracePageSizes && Verbose) {
3262 tty->print_cr("Reserving large pages individually.");
3263 }
3264 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3265 if (p_buf == NULL) {
3266 // give an appropriate warning message
3267 if (UseNUMAInterleaving) {
3268 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3269 }
3270 if (UseLargePagesIndividualAllocation) {
3271 warning("Individually allocated large pages failed, "
3272 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3273 }
3274 return NULL;
3275 }
3276
3277 return p_buf;
3278
3279 } else {
3280 if (TracePageSizes && Verbose) {
3281 tty->print_cr("Reserving large pages in a single large chunk.");
3282 }
3283 // normal policy just allocate it all at once
3284 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3285 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3286 if (res != NULL) {
3287 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3288 }
3289
3290 return res;
3291 }
3292 }
3293
3294 bool os::release_memory_special(char* base, size_t bytes) {
3295 assert(base != NULL, "Sanity check");
3296 return release_memory(base, bytes);
3297 }
3298
3299 void os::print_statistics() {
3300 }
3301
3302 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3303 int err = os::get_last_error();
3304 char buf[256];
3305 size_t buf_len = os::lasterror(buf, sizeof(buf));
3306 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3307 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3308 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3309 }
3310
3311 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3312 if (bytes == 0) {
3313 // Don't bother the OS with noops.
3314 return true;
3315 }
3316 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3317 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3318 // Don't attempt to print anything if the OS call fails. We're
3319 // probably low on resources, so the print itself may cause crashes.
3320
3321 // unless we have NUMAInterleaving enabled, the range of a commit
3322 // is always within a reserve covered by a single VirtualAlloc
3323 // in that case we can just do a single commit for the requested size
3324 if (!UseNUMAInterleaving) {
3325 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3326 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3327 return false;
3328 }
3329 if (exec) {
3330 DWORD oldprot;
3331 // Windows doc says to use VirtualProtect to get execute permissions
3332 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3333 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3334 return false;
3335 }
3336 }
3337 return true;
3338 } else {
3339
3340 // when NUMAInterleaving is enabled, the commit might cover a range that
3341 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3342 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3343 // returns represents the number of bytes that can be committed in one step.
3344 size_t bytes_remaining = bytes;
3345 char * next_alloc_addr = addr;
3346 while (bytes_remaining > 0) {
3347 MEMORY_BASIC_INFORMATION alloc_info;
3348 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3349 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3350 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3351 PAGE_READWRITE) == NULL) {
3352 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3353 exec);)
3354 return false;
3355 }
3356 if (exec) {
3357 DWORD oldprot;
3358 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3359 PAGE_EXECUTE_READWRITE, &oldprot)) {
3360 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3361 exec);)
3362 return false;
3363 }
3364 }
3365 bytes_remaining -= bytes_to_rq;
3366 next_alloc_addr += bytes_to_rq;
3367 }
3368 }
3369 // if we made it this far, return true
3370 return true;
3371 }
3372
3373 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3374 bool exec) {
3375 // alignment_hint is ignored on this OS
3376 return pd_commit_memory(addr, size, exec);
3377 }
3378
3379 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3380 const char* mesg) {
3381 assert(mesg != NULL, "mesg must be specified");
3382 if (!pd_commit_memory(addr, size, exec)) {
3383 warn_fail_commit_memory(addr, size, exec);
3384 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3385 }
3386 }
3387
3388 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3389 size_t alignment_hint, bool exec,
3390 const char* mesg) {
3391 // alignment_hint is ignored on this OS
3392 pd_commit_memory_or_exit(addr, size, exec, mesg);
3393 }
3394
3395 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3396 if (bytes == 0) {
3397 // Don't bother the OS with noops.
3398 return true;
3399 }
3400 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3401 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3402 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3403 }
3404
3405 bool os::pd_release_memory(char* addr, size_t bytes) {
3406 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3407 }
3408
3409 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3410 return os::commit_memory(addr, size, !ExecMem);
3411 }
3412
3413 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3414 return os::uncommit_memory(addr, size);
3415 }
3416
3417 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3418 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
3419 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
3420
3421 uint count = 0;
3422 bool ret = false;
3423 size_t bytes_remaining = bytes;
3424 char * next_protect_addr = addr;
3425
3426 // Below split reflects address and size when we reserved the memory by allocate_pages_individually().
3427 while (bytes_remaining) {
3428 size_t bytes_to_protect = MIN2(bytes_remaining, chunk_size - ((size_t)next_protect_addr % chunk_size));
3429 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3430 // but we don't distinguish here as both cases are protected by same API.
3431 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3432 assert(ret, "Failed protecting chunk #" UINT32_FORMAT, count);
3433 if (!ret) return false;
3434
3435 bytes_remaining -= bytes_to_protect;
3436 next_protect_addr += bytes_to_protect;
3437 count++;
3438 }
3439 return ret;
3440 }
3441
3442 // Set protections specified
3443 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3444 bool is_committed) {
3445 unsigned int p = 0;
3446 switch (prot) {
3447 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3448 case MEM_PROT_READ: p = PAGE_READONLY; break;
3449 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3450 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3451 default:
3452 ShouldNotReachHere();
3453 }
3454
3455 DWORD old_status;
3456
3457 // Strange enough, but on Win32 one can change protection only for committed
3458 // memory, not a big deal anyway, as bytes less or equal than 64K
3459 if (!is_committed) {
3460 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3461 "cannot commit protection page");
3462 }
3463 // One cannot use os::guard_memory() here, as on Win32 guard page
3464 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3465 //
3466 // Pages in the region become guard pages. Any attempt to access a guard page
3467 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3468 // the guard page status. Guard pages thus act as a one-time access alarm.
3469 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3470 bool ret;
3471 if (use_individual) {
3472 ret = protect_pages_individually(addr, bytes, p, &old_status);
3473 } else {
3474 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3475 }
3476 #ifdef ASSERT
3477 if (!ret) {
3478 int err = os::get_last_error();
3479 char buf[256];
3480 size_t buf_len = os::lasterror(buf, sizeof(buf));
3481 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3482 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3483 buf_len != 0 ? buf : "<no_error_string>", err);
3484 }
3485 #endif
3486 return ret;
3487 }
3488
3489 bool os::guard_memory(char* addr, size_t bytes) {
3490 DWORD old_status;
3491 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3492 }
3493
3494 bool os::unguard_memory(char* addr, size_t bytes) {
3495 DWORD old_status;
3496 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3497 }
3498
3499 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3500 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3501 void os::numa_make_global(char *addr, size_t bytes) { }
3502 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3503 bool os::numa_topology_changed() { return false; }
3504 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3505 int os::numa_get_group_id() { return 0; }
3506 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3507 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3508 // Provide an answer for UMA systems
3509 ids[0] = 0;
3510 return 1;
3511 } else {
3512 // check for size bigger than actual groups_num
3513 size = MIN2(size, numa_get_groups_num());
3514 for (int i = 0; i < (int)size; i++) {
3515 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3516 }
3517 return size;
3518 }
3519 }
3520
3521 bool os::get_page_info(char *start, page_info* info) {
3522 return false;
3523 }
3524
3525 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3526 page_info* page_found) {
3527 return end;
3528 }
3529
3530 char* os::non_memory_address_word() {
3531 // Must never look like an address returned by reserve_memory,
3532 // even in its subfields (as defined by the CPU immediate fields,
3533 // if the CPU splits constants across multiple instructions).
3534 return (char*)-1;
3535 }
3536
3537 #define MAX_ERROR_COUNT 100
3538 #define SYS_THREAD_ERROR 0xffffffffUL
3539
3540 void os::pd_start_thread(Thread* thread) {
3541 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3542 // Returns previous suspend state:
3543 // 0: Thread was not suspended
3544 // 1: Thread is running now
3545 // >1: Thread is still suspended.
3546 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3547 }
3548
3549 class HighResolutionInterval : public CHeapObj<mtThread> {
3550 // The default timer resolution seems to be 10 milliseconds.
3551 // (Where is this written down?)
3552 // If someone wants to sleep for only a fraction of the default,
3553 // then we set the timer resolution down to 1 millisecond for
3554 // the duration of their interval.
3555 // We carefully set the resolution back, since otherwise we
3556 // seem to incur an overhead (3%?) that we don't need.
3557 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3558 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3559 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3560 // timeBeginPeriod() if the relative error exceeded some threshold.
3561 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3562 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3563 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3564 // resolution timers running.
3565 private:
3566 jlong resolution;
3567 public:
3568 HighResolutionInterval(jlong ms) {
3569 resolution = ms % 10L;
3570 if (resolution != 0) {
3571 MMRESULT result = timeBeginPeriod(1L);
3572 }
3573 }
3574 ~HighResolutionInterval() {
3575 if (resolution != 0) {
3576 MMRESULT result = timeEndPeriod(1L);
3577 }
3578 resolution = 0L;
3579 }
3580 };
3581
3582 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3583 jlong limit = (jlong) MAXDWORD;
3584
3585 while (ms > limit) {
3586 int res;
3587 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3588 return res;
3589 }
3590 ms -= limit;
3591 }
3592
3593 assert(thread == Thread::current(), "thread consistency check");
3594 OSThread* osthread = thread->osthread();
3595 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3596 int result;
3597 if (interruptable) {
3598 assert(thread->is_Java_thread(), "must be java thread");
3599 JavaThread *jt = (JavaThread *) thread;
3600 ThreadBlockInVM tbivm(jt);
3601
3602 jt->set_suspend_equivalent();
3603 // cleared by handle_special_suspend_equivalent_condition() or
3604 // java_suspend_self() via check_and_wait_while_suspended()
3605
3606 HANDLE events[1];
3607 events[0] = osthread->interrupt_event();
3608 HighResolutionInterval *phri=NULL;
3609 if (!ForceTimeHighResolution) {
3610 phri = new HighResolutionInterval(ms);
3611 }
3612 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3613 result = OS_TIMEOUT;
3614 } else {
3615 ResetEvent(osthread->interrupt_event());
3616 osthread->set_interrupted(false);
3617 result = OS_INTRPT;
3618 }
3619 delete phri; //if it is NULL, harmless
3620
3621 // were we externally suspended while we were waiting?
3622 jt->check_and_wait_while_suspended();
3623 } else {
3624 assert(!thread->is_Java_thread(), "must not be java thread");
3625 Sleep((long) ms);
3626 result = OS_TIMEOUT;
3627 }
3628 return result;
3629 }
3630
3631 // Short sleep, direct OS call.
3632 //
3633 // ms = 0, means allow others (if any) to run.
3634 //
3635 void os::naked_short_sleep(jlong ms) {
3636 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3637 Sleep(ms);
3638 }
3639
3640 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3641 void os::infinite_sleep() {
3642 while (true) { // sleep forever ...
3643 Sleep(100000); // ... 100 seconds at a time
3644 }
3645 }
3646
3647 typedef BOOL (WINAPI * STTSignature)(void);
3648
3649 void os::naked_yield() {
3650 // Use either SwitchToThread() or Sleep(0)
3651 // Consider passing back the return value from SwitchToThread().
3652 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3653 SwitchToThread();
3654 } else {
3655 Sleep(0);
3656 }
3657 }
3658
3659 // Win32 only gives you access to seven real priorities at a time,
3660 // so we compress Java's ten down to seven. It would be better
3661 // if we dynamically adjusted relative priorities.
3662
3663 int os::java_to_os_priority[CriticalPriority + 1] = {
3664 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3665 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3666 THREAD_PRIORITY_LOWEST, // 2
3667 THREAD_PRIORITY_BELOW_NORMAL, // 3
3668 THREAD_PRIORITY_BELOW_NORMAL, // 4
3669 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3670 THREAD_PRIORITY_NORMAL, // 6
3671 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3672 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3673 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3674 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3675 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3676 };
3677
3678 int prio_policy1[CriticalPriority + 1] = {
3679 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3680 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3681 THREAD_PRIORITY_LOWEST, // 2
3682 THREAD_PRIORITY_BELOW_NORMAL, // 3
3683 THREAD_PRIORITY_BELOW_NORMAL, // 4
3684 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3685 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3686 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3687 THREAD_PRIORITY_HIGHEST, // 8
3688 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3689 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3690 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3691 };
3692
3693 static int prio_init() {
3694 // If ThreadPriorityPolicy is 1, switch tables
3695 if (ThreadPriorityPolicy == 1) {
3696 int i;
3697 for (i = 0; i < CriticalPriority + 1; i++) {
3698 os::java_to_os_priority[i] = prio_policy1[i];
3699 }
3700 }
3701 if (UseCriticalJavaThreadPriority) {
3702 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3703 }
3704 return 0;
3705 }
3706
3707 OSReturn os::set_native_priority(Thread* thread, int priority) {
3708 if (!UseThreadPriorities) return OS_OK;
3709 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3710 return ret ? OS_OK : OS_ERR;
3711 }
3712
3713 OSReturn os::get_native_priority(const Thread* const thread,
3714 int* priority_ptr) {
3715 if (!UseThreadPriorities) {
3716 *priority_ptr = java_to_os_priority[NormPriority];
3717 return OS_OK;
3718 }
3719 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3720 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3721 assert(false, "GetThreadPriority failed");
3722 return OS_ERR;
3723 }
3724 *priority_ptr = os_prio;
3725 return OS_OK;
3726 }
3727
3728
3729 // Hint to the underlying OS that a task switch would not be good.
3730 // Void return because it's a hint and can fail.
3731 void os::hint_no_preempt() {}
3732
3733 void os::interrupt(Thread* thread) {
3734 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3735 Threads_lock->owned_by_self(),
3736 "possibility of dangling Thread pointer");
3737
3738 OSThread* osthread = thread->osthread();
3739 osthread->set_interrupted(true);
3740 // More than one thread can get here with the same value of osthread,
3741 // resulting in multiple notifications. We do, however, want the store
3742 // to interrupted() to be visible to other threads before we post
3743 // the interrupt event.
3744 OrderAccess::release();
3745 SetEvent(osthread->interrupt_event());
3746 // For JSR166: unpark after setting status
3747 if (thread->is_Java_thread()) {
3748 ((JavaThread*)thread)->parker()->unpark();
3749 }
3750
3751 ParkEvent * ev = thread->_ParkEvent;
3752 if (ev != NULL) ev->unpark();
3753 }
3754
3755
3756 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3757 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3758 "possibility of dangling Thread pointer");
3759
3760 OSThread* osthread = thread->osthread();
3761 // There is no synchronization between the setting of the interrupt
3762 // and it being cleared here. It is critical - see 6535709 - that
3763 // we only clear the interrupt state, and reset the interrupt event,
3764 // if we are going to report that we were indeed interrupted - else
3765 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3766 // depending on the timing. By checking thread interrupt event to see
3767 // if the thread gets real interrupt thus prevent spurious wakeup.
3768 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3769 if (interrupted && clear_interrupted) {
3770 osthread->set_interrupted(false);
3771 ResetEvent(osthread->interrupt_event());
3772 } // Otherwise leave the interrupted state alone
3773
3774 return interrupted;
3775 }
3776
3777 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3778 ExtendedPC os::get_thread_pc(Thread* thread) {
3779 CONTEXT context;
3780 context.ContextFlags = CONTEXT_CONTROL;
3781 HANDLE handle = thread->osthread()->thread_handle();
3782 #ifdef _M_IA64
3783 assert(0, "Fix get_thread_pc");
3784 return ExtendedPC(NULL);
3785 #else
3786 if (GetThreadContext(handle, &context)) {
3787 #ifdef _M_AMD64
3788 return ExtendedPC((address) context.Rip);
3789 #else
3790 return ExtendedPC((address) context.Eip);
3791 #endif
3792 } else {
3793 return ExtendedPC(NULL);
3794 }
3795 #endif
3796 }
3797
3798 // GetCurrentThreadId() returns DWORD
3799 intx os::current_thread_id() { return GetCurrentThreadId(); }
3800
3801 static int _initial_pid = 0;
3802
3803 int os::current_process_id() {
3804 return (_initial_pid ? _initial_pid : _getpid());
3805 }
3806
3807 int os::win32::_vm_page_size = 0;
3808 int os::win32::_vm_allocation_granularity = 0;
3809 int os::win32::_processor_type = 0;
3810 // Processor level is not available on non-NT systems, use vm_version instead
3811 int os::win32::_processor_level = 0;
3812 julong os::win32::_physical_memory = 0;
3813 size_t os::win32::_default_stack_size = 0;
3814
3815 intx os::win32::_os_thread_limit = 0;
3816 volatile intx os::win32::_os_thread_count = 0;
3817
3818 bool os::win32::_is_nt = false;
3819 bool os::win32::_is_windows_2003 = false;
3820 bool os::win32::_is_windows_server = false;
3821
3822 // 6573254
3823 // Currently, the bug is observed across all the supported Windows releases,
3824 // including the latest one (as of this writing - Windows Server 2012 R2)
3825 bool os::win32::_has_exit_bug = true;
3826 bool os::win32::_has_performance_count = 0;
3827
3828 void os::win32::initialize_system_info() {
3829 SYSTEM_INFO si;
3830 GetSystemInfo(&si);
3831 _vm_page_size = si.dwPageSize;
3832 _vm_allocation_granularity = si.dwAllocationGranularity;
3833 _processor_type = si.dwProcessorType;
3834 _processor_level = si.wProcessorLevel;
3835 set_processor_count(si.dwNumberOfProcessors);
3836
3837 MEMORYSTATUSEX ms;
3838 ms.dwLength = sizeof(ms);
3839
3840 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3841 // dwMemoryLoad (% of memory in use)
3842 GlobalMemoryStatusEx(&ms);
3843 _physical_memory = ms.ullTotalPhys;
3844
3845 OSVERSIONINFOEX oi;
3846 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3847 GetVersionEx((OSVERSIONINFO*)&oi);
3848 switch (oi.dwPlatformId) {
3849 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3850 case VER_PLATFORM_WIN32_NT:
3851 _is_nt = true;
3852 {
3853 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3854 if (os_vers == 5002) {
3855 _is_windows_2003 = true;
3856 }
3857 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3858 oi.wProductType == VER_NT_SERVER) {
3859 _is_windows_server = true;
3860 }
3861 }
3862 break;
3863 default: fatal("Unknown platform");
3864 }
3865
3866 _default_stack_size = os::current_stack_size();
3867 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3868 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3869 "stack size not a multiple of page size");
3870
3871 initialize_performance_counter();
3872 }
3873
3874
3875 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3876 int ebuflen) {
3877 char path[MAX_PATH];
3878 DWORD size;
3879 DWORD pathLen = (DWORD)sizeof(path);
3880 HINSTANCE result = NULL;
3881
3882 // only allow library name without path component
3883 assert(strchr(name, '\\') == NULL, "path not allowed");
3884 assert(strchr(name, ':') == NULL, "path not allowed");
3885 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3886 jio_snprintf(ebuf, ebuflen,
3887 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3888 return NULL;
3889 }
3890
3891 // search system directory
3892 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3893 if (size >= pathLen) {
3894 return NULL; // truncated
3895 }
3896 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3897 return NULL; // truncated
3898 }
3899 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3900 return result;
3901 }
3902 }
3903
3904 // try Windows directory
3905 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3906 if (size >= pathLen) {
3907 return NULL; // truncated
3908 }
3909 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3910 return NULL; // truncated
3911 }
3912 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3913 return result;
3914 }
3915 }
3916
3917 jio_snprintf(ebuf, ebuflen,
3918 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3919 return NULL;
3920 }
3921
3922 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3923
3924 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3925 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3926 return TRUE;
3927 }
3928
3929 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3930 // Basic approach:
3931 // - Each exiting thread registers its intent to exit and then does so.
3932 // - A thread trying to terminate the process must wait for all
3933 // threads currently exiting to complete their exit.
3934
3935 if (os::win32::has_exit_bug()) {
3936 // The array holds handles of the threads that have started exiting by calling
3937 // _endthreadex().
3938 // Should be large enough to avoid blocking the exiting thread due to lack of
3939 // a free slot.
3940 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3941 static int handle_count = 0;
3942
3943 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3944 static CRITICAL_SECTION crit_sect;
3945 static volatile jint process_exiting = 0;
3946 int i, j;
3947 DWORD res;
3948 HANDLE hproc, hthr;
3949
3950 // The first thread that reached this point, initializes the critical section.
3951 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3952 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3953 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3954 EnterCriticalSection(&crit_sect);
3955
3956 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3957 // Remove from the array those handles of the threads that have completed exiting.
3958 for (i = 0, j = 0; i < handle_count; ++i) {
3959 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3960 if (res == WAIT_TIMEOUT) {
3961 handles[j++] = handles[i];
3962 } else {
3963 if (res == WAIT_FAILED) {
3964 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3965 GetLastError(), __FILE__, __LINE__);
3966 }
3967 // Don't keep the handle, if we failed waiting for it.
3968 CloseHandle(handles[i]);
3969 }
3970 }
3971
3972 // If there's no free slot in the array of the kept handles, we'll have to
3973 // wait until at least one thread completes exiting.
3974 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3975 // Raise the priority of the oldest exiting thread to increase its chances
3976 // to complete sooner.
3977 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3978 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3979 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3980 i = (res - WAIT_OBJECT_0);
3981 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3982 for (; i < handle_count; ++i) {
3983 handles[i] = handles[i + 1];
3984 }
3985 } else {
3986 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3987 (res == WAIT_FAILED ? "failed" : "timed out"),
3988 GetLastError(), __FILE__, __LINE__);
3989 // Don't keep handles, if we failed waiting for them.
3990 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3991 CloseHandle(handles[i]);
3992 }
3993 handle_count = 0;
3994 }
3995 }
3996
3997 // Store a duplicate of the current thread handle in the array of handles.
3998 hproc = GetCurrentProcess();
3999 hthr = GetCurrentThread();
4000 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
4001 0, FALSE, DUPLICATE_SAME_ACCESS)) {
4002 warning("DuplicateHandle failed (%u) in %s: %d\n",
4003 GetLastError(), __FILE__, __LINE__);
4004 } else {
4005 ++handle_count;
4006 }
4007
4008 // The current exiting thread has stored its handle in the array, and now
4009 // should leave the critical section before calling _endthreadex().
4010
4011 } else if (what != EPT_THREAD) {
4012 if (handle_count > 0) {
4013 // Before ending the process, make sure all the threads that had called
4014 // _endthreadex() completed.
4015
4016 // Set the priority level of the current thread to the same value as
4017 // the priority level of exiting threads.
4018 // This is to ensure it will be given a fair chance to execute if
4019 // the timeout expires.
4020 hthr = GetCurrentThread();
4021 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
4022 for (i = 0; i < handle_count; ++i) {
4023 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
4024 }
4025 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
4026 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4027 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4028 (res == WAIT_FAILED ? "failed" : "timed out"),
4029 GetLastError(), __FILE__, __LINE__);
4030 }
4031 for (i = 0; i < handle_count; ++i) {
4032 CloseHandle(handles[i]);
4033 }
4034 handle_count = 0;
4035 }
4036
4037 OrderAccess::release_store(&process_exiting, 1);
4038 }
4039
4040 LeaveCriticalSection(&crit_sect);
4041 }
4042
4043 if (what == EPT_THREAD) {
4044 while (OrderAccess::load_acquire(&process_exiting) != 0) {
4045 // Some other thread is about to call exit(), so we
4046 // don't let the current thread proceed to _endthreadex()
4047 SuspendThread(GetCurrentThread());
4048 // Avoid busy-wait loop, if SuspendThread() failed.
4049 Sleep(EXIT_TIMEOUT);
4050 }
4051 }
4052 }
4053
4054 // We are here if either
4055 // - there's no 'race at exit' bug on this OS release;
4056 // - initialization of the critical section failed (unlikely);
4057 // - the current thread has stored its handle and left the critical section;
4058 // - the process-exiting thread has raised the flag and left the critical section.
4059 if (what == EPT_THREAD) {
4060 _endthreadex((unsigned)exit_code);
4061 } else if (what == EPT_PROCESS) {
4062 ::exit(exit_code);
4063 } else {
4064 _exit(exit_code);
4065 }
4066
4067 // Should not reach here
4068 return exit_code;
4069 }
4070
4071 #undef EXIT_TIMEOUT
4072
4073 void os::win32::setmode_streams() {
4074 _setmode(_fileno(stdin), _O_BINARY);
4075 _setmode(_fileno(stdout), _O_BINARY);
4076 _setmode(_fileno(stderr), _O_BINARY);
4077 }
4078
4079
4080 bool os::is_debugger_attached() {
4081 return IsDebuggerPresent() ? true : false;
4082 }
4083
4084
4085 void os::wait_for_keypress_at_exit(void) {
4086 if (PauseAtExit) {
4087 fprintf(stderr, "Press any key to continue...\n");
4088 fgetc(stdin);
4089 }
4090 }
4091
4092
4093 bool os::message_box(const char* title, const char* message) {
4094 int result = MessageBox(NULL, message, title,
4095 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4096 return result == IDYES;
4097 }
4098
4099 #ifndef PRODUCT
4100 #ifndef _WIN64
4101 // Helpers to check whether NX protection is enabled
4102 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4103 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4104 pex->ExceptionRecord->NumberParameters > 0 &&
4105 pex->ExceptionRecord->ExceptionInformation[0] ==
4106 EXCEPTION_INFO_EXEC_VIOLATION) {
4107 return EXCEPTION_EXECUTE_HANDLER;
4108 }
4109 return EXCEPTION_CONTINUE_SEARCH;
4110 }
4111
4112 void nx_check_protection() {
4113 // If NX is enabled we'll get an exception calling into code on the stack
4114 char code[] = { (char)0xC3 }; // ret
4115 void *code_ptr = (void *)code;
4116 __try {
4117 __asm call code_ptr
4118 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4119 tty->print_raw_cr("NX protection detected.");
4120 }
4121 }
4122 #endif // _WIN64
4123 #endif // PRODUCT
4124
4125 // this is called _before_ the global arguments have been parsed
4126 void os::init(void) {
4127 _initial_pid = _getpid();
4128
4129 init_random(1234567);
4130
4131 win32::initialize_system_info();
4132 win32::setmode_streams();
4133 init_page_sizes((size_t) win32::vm_page_size());
4134
4135 // This may be overridden later when argument processing is done.
4136 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4137 os::win32::is_windows_2003());
4138
4139 // Initialize main_process and main_thread
4140 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4141 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4142 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4143 fatal("DuplicateHandle failed\n");
4144 }
4145 main_thread_id = (int) GetCurrentThreadId();
4146
4147 // initialize fast thread access - only used for 32-bit
4148 win32::initialize_thread_ptr_offset();
4149 }
4150
4151 // To install functions for atexit processing
4152 extern "C" {
4153 static void perfMemory_exit_helper() {
4154 perfMemory_exit();
4155 }
4156 }
4157
4158 static jint initSock();
4159
4160 // this is called _after_ the global arguments have been parsed
4161 jint os::init_2(void) {
4162 // Allocate a single page and mark it as readable for safepoint polling
4163 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4164 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4165
4166 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4167 guarantee(return_page != NULL, "Commit Failed for polling page");
4168
4169 os::set_polling_page(polling_page);
4170
4171 #ifndef PRODUCT
4172 if (Verbose && PrintMiscellaneous) {
4173 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4174 (intptr_t)polling_page);
4175 }
4176 #endif
4177
4178 if (!UseMembar) {
4179 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4180 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4181
4182 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4183 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4184
4185 os::set_memory_serialize_page(mem_serialize_page);
4186
4187 #ifndef PRODUCT
4188 if (Verbose && PrintMiscellaneous) {
4189 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4190 (intptr_t)mem_serialize_page);
4191 }
4192 #endif
4193 }
4194
4195 // Setup Windows Exceptions
4196
4197 // for debugging float code generation bugs
4198 if (ForceFloatExceptions) {
4199 #ifndef _WIN64
4200 static long fp_control_word = 0;
4201 __asm { fstcw fp_control_word }
4202 // see Intel PPro Manual, Vol. 2, p 7-16
4203 const long precision = 0x20;
4204 const long underflow = 0x10;
4205 const long overflow = 0x08;
4206 const long zero_div = 0x04;
4207 const long denorm = 0x02;
4208 const long invalid = 0x01;
4209 fp_control_word |= invalid;
4210 __asm { fldcw fp_control_word }
4211 #endif
4212 }
4213
4214 // If stack_commit_size is 0, windows will reserve the default size,
4215 // but only commit a small portion of it.
4216 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4217 size_t default_reserve_size = os::win32::default_stack_size();
4218 size_t actual_reserve_size = stack_commit_size;
4219 if (stack_commit_size < default_reserve_size) {
4220 // If stack_commit_size == 0, we want this too
4221 actual_reserve_size = default_reserve_size;
4222 }
4223
4224 // Check minimum allowable stack size for thread creation and to initialize
4225 // the java system classes, including StackOverflowError - depends on page
4226 // size. Add a page for compiler2 recursion in main thread.
4227 // Add in 2*BytesPerWord times page size to account for VM stack during
4228 // class initialization depending on 32 or 64 bit VM.
4229 size_t min_stack_allowed =
4230 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4231 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4232 if (actual_reserve_size < min_stack_allowed) {
4233 tty->print_cr("\nThe stack size specified is too small, "
4234 "Specify at least %dk",
4235 min_stack_allowed / K);
4236 return JNI_ERR;
4237 }
4238
4239 JavaThread::set_stack_size_at_create(stack_commit_size);
4240
4241 // Calculate theoretical max. size of Threads to guard gainst artifical
4242 // out-of-memory situations, where all available address-space has been
4243 // reserved by thread stacks.
4244 assert(actual_reserve_size != 0, "Must have a stack");
4245
4246 // Calculate the thread limit when we should start doing Virtual Memory
4247 // banging. Currently when the threads will have used all but 200Mb of space.
4248 //
4249 // TODO: consider performing a similar calculation for commit size instead
4250 // as reserve size, since on a 64-bit platform we'll run into that more
4251 // often than running out of virtual memory space. We can use the
4252 // lower value of the two calculations as the os_thread_limit.
4253 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4254 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4255
4256 // at exit methods are called in the reverse order of their registration.
4257 // there is no limit to the number of functions registered. atexit does
4258 // not set errno.
4259
4260 if (PerfAllowAtExitRegistration) {
4261 // only register atexit functions if PerfAllowAtExitRegistration is set.
4262 // atexit functions can be delayed until process exit time, which
4263 // can be problematic for embedded VM situations. Embedded VMs should
4264 // call DestroyJavaVM() to assure that VM resources are released.
4265
4266 // note: perfMemory_exit_helper atexit function may be removed in
4267 // the future if the appropriate cleanup code can be added to the
4268 // VM_Exit VMOperation's doit method.
4269 if (atexit(perfMemory_exit_helper) != 0) {
4270 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4271 }
4272 }
4273
4274 #ifndef _WIN64
4275 // Print something if NX is enabled (win32 on AMD64)
4276 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4277 #endif
4278
4279 // initialize thread priority policy
4280 prio_init();
4281
4282 if (UseNUMA && !ForceNUMA) {
4283 UseNUMA = false; // We don't fully support this yet
4284 }
4285
4286 if (UseNUMAInterleaving) {
4287 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4288 bool success = numa_interleaving_init();
4289 if (!success) UseNUMAInterleaving = false;
4290 }
4291
4292 if (initSock() != JNI_OK) {
4293 return JNI_ERR;
4294 }
4295
4296 return JNI_OK;
4297 }
4298
4299 // Mark the polling page as unreadable
4300 void os::make_polling_page_unreadable(void) {
4301 DWORD old_status;
4302 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4303 PAGE_NOACCESS, &old_status)) {
4304 fatal("Could not disable polling page");
4305 }
4306 }
4307
4308 // Mark the polling page as readable
4309 void os::make_polling_page_readable(void) {
4310 DWORD old_status;
4311 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4312 PAGE_READONLY, &old_status)) {
4313 fatal("Could not enable polling page");
4314 }
4315 }
4316
4317
4318 int os::stat(const char *path, struct stat *sbuf) {
4319 char pathbuf[MAX_PATH];
4320 if (strlen(path) > MAX_PATH - 1) {
4321 errno = ENAMETOOLONG;
4322 return -1;
4323 }
4324 os::native_path(strcpy(pathbuf, path));
4325 int ret = ::stat(pathbuf, sbuf);
4326 if (sbuf != NULL && UseUTCFileTimestamp) {
4327 // Fix for 6539723. st_mtime returned from stat() is dependent on
4328 // the system timezone and so can return different values for the
4329 // same file if/when daylight savings time changes. This adjustment
4330 // makes sure the same timestamp is returned regardless of the TZ.
4331 //
4332 // See:
4333 // http://msdn.microsoft.com/library/
4334 // default.asp?url=/library/en-us/sysinfo/base/
4335 // time_zone_information_str.asp
4336 // and
4337 // http://msdn.microsoft.com/library/default.asp?url=
4338 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4339 //
4340 // NOTE: there is a insidious bug here: If the timezone is changed
4341 // after the call to stat() but before 'GetTimeZoneInformation()', then
4342 // the adjustment we do here will be wrong and we'll return the wrong
4343 // value (which will likely end up creating an invalid class data
4344 // archive). Absent a better API for this, or some time zone locking
4345 // mechanism, we'll have to live with this risk.
4346 TIME_ZONE_INFORMATION tz;
4347 DWORD tzid = GetTimeZoneInformation(&tz);
4348 int daylightBias =
4349 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4350 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4351 }
4352 return ret;
4353 }
4354
4355
4356 #define FT2INT64(ft) \
4357 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4358
4359
4360 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4361 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4362 // of a thread.
4363 //
4364 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4365 // the fast estimate available on the platform.
4366
4367 // current_thread_cpu_time() is not optimized for Windows yet
4368 jlong os::current_thread_cpu_time() {
4369 // return user + sys since the cost is the same
4370 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4371 }
4372
4373 jlong os::thread_cpu_time(Thread* thread) {
4374 // consistent with what current_thread_cpu_time() returns.
4375 return os::thread_cpu_time(thread, true /* user+sys */);
4376 }
4377
4378 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4379 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4380 }
4381
4382 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4383 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4384 // If this function changes, os::is_thread_cpu_time_supported() should too
4385 if (os::win32::is_nt()) {
4386 FILETIME CreationTime;
4387 FILETIME ExitTime;
4388 FILETIME KernelTime;
4389 FILETIME UserTime;
4390
4391 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4392 &ExitTime, &KernelTime, &UserTime) == 0) {
4393 return -1;
4394 } else if (user_sys_cpu_time) {
4395 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4396 } else {
4397 return FT2INT64(UserTime) * 100;
4398 }
4399 } else {
4400 return (jlong) timeGetTime() * 1000000;
4401 }
4402 }
4403
4404 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4405 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4406 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4407 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4408 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4409 }
4410
4411 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4412 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4413 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4414 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4415 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4416 }
4417
4418 bool os::is_thread_cpu_time_supported() {
4419 // see os::thread_cpu_time
4420 if (os::win32::is_nt()) {
4421 FILETIME CreationTime;
4422 FILETIME ExitTime;
4423 FILETIME KernelTime;
4424 FILETIME UserTime;
4425
4426 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4427 &KernelTime, &UserTime) == 0) {
4428 return false;
4429 } else {
4430 return true;
4431 }
4432 } else {
4433 return false;
4434 }
4435 }
4436
4437 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4438 // It does have primitives (PDH API) to get CPU usage and run queue length.
4439 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4440 // If we wanted to implement loadavg on Windows, we have a few options:
4441 //
4442 // a) Query CPU usage and run queue length and "fake" an answer by
4443 // returning the CPU usage if it's under 100%, and the run queue
4444 // length otherwise. It turns out that querying is pretty slow
4445 // on Windows, on the order of 200 microseconds on a fast machine.
4446 // Note that on the Windows the CPU usage value is the % usage
4447 // since the last time the API was called (and the first call
4448 // returns 100%), so we'd have to deal with that as well.
4449 //
4450 // b) Sample the "fake" answer using a sampling thread and store
4451 // the answer in a global variable. The call to loadavg would
4452 // just return the value of the global, avoiding the slow query.
4453 //
4454 // c) Sample a better answer using exponential decay to smooth the
4455 // value. This is basically the algorithm used by UNIX kernels.
4456 //
4457 // Note that sampling thread starvation could affect both (b) and (c).
4458 int os::loadavg(double loadavg[], int nelem) {
4459 return -1;
4460 }
4461
4462
4463 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4464 bool os::dont_yield() {
4465 return DontYieldALot;
4466 }
4467
4468 // This method is a slightly reworked copy of JDK's sysOpen
4469 // from src/windows/hpi/src/sys_api_md.c
4470
4471 int os::open(const char *path, int oflag, int mode) {
4472 char pathbuf[MAX_PATH];
4473
4474 if (strlen(path) > MAX_PATH - 1) {
4475 errno = ENAMETOOLONG;
4476 return -1;
4477 }
4478 os::native_path(strcpy(pathbuf, path));
4479 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4480 }
4481
4482 FILE* os::open(int fd, const char* mode) {
4483 return ::_fdopen(fd, mode);
4484 }
4485
4486 // Is a (classpath) directory empty?
4487 bool os::dir_is_empty(const char* path) {
4488 WIN32_FIND_DATA fd;
4489 HANDLE f = FindFirstFile(path, &fd);
4490 if (f == INVALID_HANDLE_VALUE) {
4491 return true;
4492 }
4493 FindClose(f);
4494 return false;
4495 }
4496
4497 // create binary file, rewriting existing file if required
4498 int os::create_binary_file(const char* path, bool rewrite_existing) {
4499 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4500 if (!rewrite_existing) {
4501 oflags |= _O_EXCL;
4502 }
4503 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4504 }
4505
4506 // return current position of file pointer
4507 jlong os::current_file_offset(int fd) {
4508 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4509 }
4510
4511 // move file pointer to the specified offset
4512 jlong os::seek_to_file_offset(int fd, jlong offset) {
4513 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4514 }
4515
4516
4517 jlong os::lseek(int fd, jlong offset, int whence) {
4518 return (jlong) ::_lseeki64(fd, offset, whence);
4519 }
4520
4521 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4522 OVERLAPPED ov;
4523 DWORD nread;
4524 BOOL result;
4525
4526 ZeroMemory(&ov, sizeof(ov));
4527 ov.Offset = (DWORD)offset;
4528 ov.OffsetHigh = (DWORD)(offset >> 32);
4529
4530 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4531
4532 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4533
4534 return result ? nread : 0;
4535 }
4536
4537
4538 // This method is a slightly reworked copy of JDK's sysNativePath
4539 // from src/windows/hpi/src/path_md.c
4540
4541 // Convert a pathname to native format. On win32, this involves forcing all
4542 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4543 // sometimes rejects '/') and removing redundant separators. The input path is
4544 // assumed to have been converted into the character encoding used by the local
4545 // system. Because this might be a double-byte encoding, care is taken to
4546 // treat double-byte lead characters correctly.
4547 //
4548 // This procedure modifies the given path in place, as the result is never
4549 // longer than the original. There is no error return; this operation always
4550 // succeeds.
4551 char * os::native_path(char *path) {
4552 char *src = path, *dst = path, *end = path;
4553 char *colon = NULL; // If a drive specifier is found, this will
4554 // point to the colon following the drive letter
4555
4556 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4557 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4558 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4559
4560 // Check for leading separators
4561 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4562 while (isfilesep(*src)) {
4563 src++;
4564 }
4565
4566 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4567 // Remove leading separators if followed by drive specifier. This
4568 // hack is necessary to support file URLs containing drive
4569 // specifiers (e.g., "file://c:/path"). As a side effect,
4570 // "/c:/path" can be used as an alternative to "c:/path".
4571 *dst++ = *src++;
4572 colon = dst;
4573 *dst++ = ':';
4574 src++;
4575 } else {
4576 src = path;
4577 if (isfilesep(src[0]) && isfilesep(src[1])) {
4578 // UNC pathname: Retain first separator; leave src pointed at
4579 // second separator so that further separators will be collapsed
4580 // into the second separator. The result will be a pathname
4581 // beginning with "\\\\" followed (most likely) by a host name.
4582 src = dst = path + 1;
4583 path[0] = '\\'; // Force first separator to '\\'
4584 }
4585 }
4586
4587 end = dst;
4588
4589 // Remove redundant separators from remainder of path, forcing all
4590 // separators to be '\\' rather than '/'. Also, single byte space
4591 // characters are removed from the end of the path because those
4592 // are not legal ending characters on this operating system.
4593 //
4594 while (*src != '\0') {
4595 if (isfilesep(*src)) {
4596 *dst++ = '\\'; src++;
4597 while (isfilesep(*src)) src++;
4598 if (*src == '\0') {
4599 // Check for trailing separator
4600 end = dst;
4601 if (colon == dst - 2) break; // "z:\\"
4602 if (dst == path + 1) break; // "\\"
4603 if (dst == path + 2 && isfilesep(path[0])) {
4604 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4605 // beginning of a UNC pathname. Even though it is not, by
4606 // itself, a valid UNC pathname, we leave it as is in order
4607 // to be consistent with the path canonicalizer as well
4608 // as the win32 APIs, which treat this case as an invalid
4609 // UNC pathname rather than as an alias for the root
4610 // directory of the current drive.
4611 break;
4612 }
4613 end = --dst; // Path does not denote a root directory, so
4614 // remove trailing separator
4615 break;
4616 }
4617 end = dst;
4618 } else {
4619 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4620 *dst++ = *src++;
4621 if (*src) *dst++ = *src++;
4622 end = dst;
4623 } else { // Copy a single-byte character
4624 char c = *src++;
4625 *dst++ = c;
4626 // Space is not a legal ending character
4627 if (c != ' ') end = dst;
4628 }
4629 }
4630 }
4631
4632 *end = '\0';
4633
4634 // For "z:", add "." to work around a bug in the C runtime library
4635 if (colon == dst - 1) {
4636 path[2] = '.';
4637 path[3] = '\0';
4638 }
4639
4640 return path;
4641 }
4642
4643 // This code is a copy of JDK's sysSetLength
4644 // from src/windows/hpi/src/sys_api_md.c
4645
4646 int os::ftruncate(int fd, jlong length) {
4647 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4648 long high = (long)(length >> 32);
4649 DWORD ret;
4650
4651 if (h == (HANDLE)(-1)) {
4652 return -1;
4653 }
4654
4655 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4656 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4657 return -1;
4658 }
4659
4660 if (::SetEndOfFile(h) == FALSE) {
4661 return -1;
4662 }
4663
4664 return 0;
4665 }
4666
4667
4668 // This code is a copy of JDK's sysSync
4669 // from src/windows/hpi/src/sys_api_md.c
4670 // except for the legacy workaround for a bug in Win 98
4671
4672 int os::fsync(int fd) {
4673 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4674
4675 if ((!::FlushFileBuffers(handle)) &&
4676 (GetLastError() != ERROR_ACCESS_DENIED)) {
4677 // from winerror.h
4678 return -1;
4679 }
4680 return 0;
4681 }
4682
4683 static int nonSeekAvailable(int, long *);
4684 static int stdinAvailable(int, long *);
4685
4686 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4687 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4688
4689 // This code is a copy of JDK's sysAvailable
4690 // from src/windows/hpi/src/sys_api_md.c
4691
4692 int os::available(int fd, jlong *bytes) {
4693 jlong cur, end;
4694 struct _stati64 stbuf64;
4695
4696 if (::_fstati64(fd, &stbuf64) >= 0) {
4697 int mode = stbuf64.st_mode;
4698 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4699 int ret;
4700 long lpbytes;
4701 if (fd == 0) {
4702 ret = stdinAvailable(fd, &lpbytes);
4703 } else {
4704 ret = nonSeekAvailable(fd, &lpbytes);
4705 }
4706 (*bytes) = (jlong)(lpbytes);
4707 return ret;
4708 }
4709 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4710 return FALSE;
4711 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4712 return FALSE;
4713 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4714 return FALSE;
4715 }
4716 *bytes = end - cur;
4717 return TRUE;
4718 } else {
4719 return FALSE;
4720 }
4721 }
4722
4723 // This code is a copy of JDK's nonSeekAvailable
4724 // from src/windows/hpi/src/sys_api_md.c
4725
4726 static int nonSeekAvailable(int fd, long *pbytes) {
4727 // This is used for available on non-seekable devices
4728 // (like both named and anonymous pipes, such as pipes
4729 // connected to an exec'd process).
4730 // Standard Input is a special case.
4731 HANDLE han;
4732
4733 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4734 return FALSE;
4735 }
4736
4737 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4738 // PeekNamedPipe fails when at EOF. In that case we
4739 // simply make *pbytes = 0 which is consistent with the
4740 // behavior we get on Solaris when an fd is at EOF.
4741 // The only alternative is to raise an Exception,
4742 // which isn't really warranted.
4743 //
4744 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4745 return FALSE;
4746 }
4747 *pbytes = 0;
4748 }
4749 return TRUE;
4750 }
4751
4752 #define MAX_INPUT_EVENTS 2000
4753
4754 // This code is a copy of JDK's stdinAvailable
4755 // from src/windows/hpi/src/sys_api_md.c
4756
4757 static int stdinAvailable(int fd, long *pbytes) {
4758 HANDLE han;
4759 DWORD numEventsRead = 0; // Number of events read from buffer
4760 DWORD numEvents = 0; // Number of events in buffer
4761 DWORD i = 0; // Loop index
4762 DWORD curLength = 0; // Position marker
4763 DWORD actualLength = 0; // Number of bytes readable
4764 BOOL error = FALSE; // Error holder
4765 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4766
4767 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4768 return FALSE;
4769 }
4770
4771 // Construct an array of input records in the console buffer
4772 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4773 if (error == 0) {
4774 return nonSeekAvailable(fd, pbytes);
4775 }
4776
4777 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4778 if (numEvents > MAX_INPUT_EVENTS) {
4779 numEvents = MAX_INPUT_EVENTS;
4780 }
4781
4782 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4783 if (lpBuffer == NULL) {
4784 return FALSE;
4785 }
4786
4787 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4788 if (error == 0) {
4789 os::free(lpBuffer);
4790 return FALSE;
4791 }
4792
4793 // Examine input records for the number of bytes available
4794 for (i=0; i<numEvents; i++) {
4795 if (lpBuffer[i].EventType == KEY_EVENT) {
4796
4797 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4798 &(lpBuffer[i].Event);
4799 if (keyRecord->bKeyDown == TRUE) {
4800 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4801 curLength++;
4802 if (*keyPressed == '\r') {
4803 actualLength = curLength;
4804 }
4805 }
4806 }
4807 }
4808
4809 if (lpBuffer != NULL) {
4810 os::free(lpBuffer);
4811 }
4812
4813 *pbytes = (long) actualLength;
4814 return TRUE;
4815 }
4816
4817 // Map a block of memory.
4818 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4819 char *addr, size_t bytes, bool read_only,
4820 bool allow_exec) {
4821 HANDLE hFile;
4822 char* base;
4823
4824 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4825 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4826 if (hFile == NULL) {
4827 if (PrintMiscellaneous && Verbose) {
4828 DWORD err = GetLastError();
4829 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4830 }
4831 return NULL;
4832 }
4833
4834 if (allow_exec) {
4835 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4836 // unless it comes from a PE image (which the shared archive is not.)
4837 // Even VirtualProtect refuses to give execute access to mapped memory
4838 // that was not previously executable.
4839 //
4840 // Instead, stick the executable region in anonymous memory. Yuck.
4841 // Penalty is that ~4 pages will not be shareable - in the future
4842 // we might consider DLLizing the shared archive with a proper PE
4843 // header so that mapping executable + sharing is possible.
4844
4845 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4846 PAGE_READWRITE);
4847 if (base == NULL) {
4848 if (PrintMiscellaneous && Verbose) {
4849 DWORD err = GetLastError();
4850 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4851 }
4852 CloseHandle(hFile);
4853 return NULL;
4854 }
4855
4856 DWORD bytes_read;
4857 OVERLAPPED overlapped;
4858 overlapped.Offset = (DWORD)file_offset;
4859 overlapped.OffsetHigh = 0;
4860 overlapped.hEvent = NULL;
4861 // ReadFile guarantees that if the return value is true, the requested
4862 // number of bytes were read before returning.
4863 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4864 if (!res) {
4865 if (PrintMiscellaneous && Verbose) {
4866 DWORD err = GetLastError();
4867 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4868 }
4869 release_memory(base, bytes);
4870 CloseHandle(hFile);
4871 return NULL;
4872 }
4873 } else {
4874 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4875 NULL /* file_name */);
4876 if (hMap == NULL) {
4877 if (PrintMiscellaneous && Verbose) {
4878 DWORD err = GetLastError();
4879 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4880 }
4881 CloseHandle(hFile);
4882 return NULL;
4883 }
4884
4885 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4886 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4887 (DWORD)bytes, addr);
4888 if (base == NULL) {
4889 if (PrintMiscellaneous && Verbose) {
4890 DWORD err = GetLastError();
4891 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4892 }
4893 CloseHandle(hMap);
4894 CloseHandle(hFile);
4895 return NULL;
4896 }
4897
4898 if (CloseHandle(hMap) == 0) {
4899 if (PrintMiscellaneous && Verbose) {
4900 DWORD err = GetLastError();
4901 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4902 }
4903 CloseHandle(hFile);
4904 return base;
4905 }
4906 }
4907
4908 if (allow_exec) {
4909 DWORD old_protect;
4910 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4911 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4912
4913 if (!res) {
4914 if (PrintMiscellaneous && Verbose) {
4915 DWORD err = GetLastError();
4916 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4917 }
4918 // Don't consider this a hard error, on IA32 even if the
4919 // VirtualProtect fails, we should still be able to execute
4920 CloseHandle(hFile);
4921 return base;
4922 }
4923 }
4924
4925 if (CloseHandle(hFile) == 0) {
4926 if (PrintMiscellaneous && Verbose) {
4927 DWORD err = GetLastError();
4928 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4929 }
4930 return base;
4931 }
4932
4933 return base;
4934 }
4935
4936
4937 // Remap a block of memory.
4938 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4939 char *addr, size_t bytes, bool read_only,
4940 bool allow_exec) {
4941 // This OS does not allow existing memory maps to be remapped so we
4942 // have to unmap the memory before we remap it.
4943 if (!os::unmap_memory(addr, bytes)) {
4944 return NULL;
4945 }
4946
4947 // There is a very small theoretical window between the unmap_memory()
4948 // call above and the map_memory() call below where a thread in native
4949 // code may be able to access an address that is no longer mapped.
4950
4951 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4952 read_only, allow_exec);
4953 }
4954
4955
4956 // Unmap a block of memory.
4957 // Returns true=success, otherwise false.
4958
4959 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4960 MEMORY_BASIC_INFORMATION mem_info;
4961 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4962 if (PrintMiscellaneous && Verbose) {
4963 DWORD err = GetLastError();
4964 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4965 }
4966 return false;
4967 }
4968
4969 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4970 // Instead, executable region was allocated using VirtualAlloc(). See
4971 // pd_map_memory() above.
4972 //
4973 // The following flags should match the 'exec_access' flages used for
4974 // VirtualProtect() in pd_map_memory().
4975 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4976 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4977 return pd_release_memory(addr, bytes);
4978 }
4979
4980 BOOL result = UnmapViewOfFile(addr);
4981 if (result == 0) {
4982 if (PrintMiscellaneous && Verbose) {
4983 DWORD err = GetLastError();
4984 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4985 }
4986 return false;
4987 }
4988 return true;
4989 }
4990
4991 void os::pause() {
4992 char filename[MAX_PATH];
4993 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4994 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4995 } else {
4996 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4997 }
4998
4999 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5000 if (fd != -1) {
5001 struct stat buf;
5002 ::close(fd);
5003 while (::stat(filename, &buf) == 0) {
5004 Sleep(100);
5005 }
5006 } else {
5007 jio_fprintf(stderr,
5008 "Could not open pause file '%s', continuing immediately.\n", filename);
5009 }
5010 }
5011
5012 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
5013 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
5014 }
5015
5016 // See the caveats for this class in os_windows.hpp
5017 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5018 // into this method and returns false. If no OS EXCEPTION was raised, returns
5019 // true.
5020 // The callback is supposed to provide the method that should be protected.
5021 //
5022 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5023 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
5024 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
5025 "crash_protection already set?");
5026
5027 bool success = true;
5028 __try {
5029 WatcherThread::watcher_thread()->set_crash_protection(this);
5030 cb.call();
5031 } __except(EXCEPTION_EXECUTE_HANDLER) {
5032 // only for protection, nothing to do
5033 success = false;
5034 }
5035 WatcherThread::watcher_thread()->set_crash_protection(NULL);
5036 return success;
5037 }
5038
5039 // An Event wraps a win32 "CreateEvent" kernel handle.
5040 //
5041 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5042 //
5043 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5044 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5045 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5046 // In addition, an unpark() operation might fetch the handle field, but the
5047 // event could recycle between the fetch and the SetEvent() operation.
5048 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5049 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5050 // on an stale but recycled handle would be harmless, but in practice this might
5051 // confuse other non-Sun code, so it's not a viable approach.
5052 //
5053 // 2: Once a win32 event handle is associated with an Event, it remains associated
5054 // with the Event. The event handle is never closed. This could be construed
5055 // as handle leakage, but only up to the maximum # of threads that have been extant
5056 // at any one time. This shouldn't be an issue, as windows platforms typically
5057 // permit a process to have hundreds of thousands of open handles.
5058 //
5059 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5060 // and release unused handles.
5061 //
5062 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5063 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5064 //
5065 // 5. Use an RCU-like mechanism (Read-Copy Update).
5066 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5067 //
5068 // We use (2).
5069 //
5070 // TODO-FIXME:
5071 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5072 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5073 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5074 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5075 // into a single win32 CreateEvent() handle.
5076 //
5077 // Assumption:
5078 // Only one parker can exist on an event, which is why we allocate
5079 // them per-thread. Multiple unparkers can coexist.
5080 //
5081 // _Event transitions in park()
5082 // -1 => -1 : illegal
5083 // 1 => 0 : pass - return immediately
5084 // 0 => -1 : block; then set _Event to 0 before returning
5085 //
5086 // _Event transitions in unpark()
5087 // 0 => 1 : just return
5088 // 1 => 1 : just return
5089 // -1 => either 0 or 1; must signal target thread
5090 // That is, we can safely transition _Event from -1 to either
5091 // 0 or 1.
5092 //
5093 // _Event serves as a restricted-range semaphore.
5094 // -1 : thread is blocked, i.e. there is a waiter
5095 // 0 : neutral: thread is running or ready,
5096 // could have been signaled after a wait started
5097 // 1 : signaled - thread is running or ready
5098 //
5099 // Another possible encoding of _Event would be with
5100 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5101 //
5102
5103 int os::PlatformEvent::park(jlong Millis) {
5104 // Transitions for _Event:
5105 // -1 => -1 : illegal
5106 // 1 => 0 : pass - return immediately
5107 // 0 => -1 : block; then set _Event to 0 before returning
5108
5109 guarantee(_ParkHandle != NULL , "Invariant");
5110 guarantee(Millis > 0 , "Invariant");
5111
5112 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5113 // the initial park() operation.
5114 // Consider: use atomic decrement instead of CAS-loop
5115
5116 int v;
5117 for (;;) {
5118 v = _Event;
5119 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5120 }
5121 guarantee((v == 0) || (v == 1), "invariant");
5122 if (v != 0) return OS_OK;
5123
5124 // Do this the hard way by blocking ...
5125 // TODO: consider a brief spin here, gated on the success of recent
5126 // spin attempts by this thread.
5127 //
5128 // We decompose long timeouts into series of shorter timed waits.
5129 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5130 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5131 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5132 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5133 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5134 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5135 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5136 // for the already waited time. This policy does not admit any new outcomes.
5137 // In the future, however, we might want to track the accumulated wait time and
5138 // adjust Millis accordingly if we encounter a spurious wakeup.
5139
5140 const int MAXTIMEOUT = 0x10000000;
5141 DWORD rv = WAIT_TIMEOUT;
5142 while (_Event < 0 && Millis > 0) {
5143 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5144 if (Millis > MAXTIMEOUT) {
5145 prd = MAXTIMEOUT;
5146 }
5147 rv = ::WaitForSingleObject(_ParkHandle, prd);
5148 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5149 if (rv == WAIT_TIMEOUT) {
5150 Millis -= prd;
5151 }
5152 }
5153 v = _Event;
5154 _Event = 0;
5155 // see comment at end of os::PlatformEvent::park() below:
5156 OrderAccess::fence();
5157 // If we encounter a nearly simultanous timeout expiry and unpark()
5158 // we return OS_OK indicating we awoke via unpark().
5159 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5160 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5161 }
5162
5163 void os::PlatformEvent::park() {
5164 // Transitions for _Event:
5165 // -1 => -1 : illegal
5166 // 1 => 0 : pass - return immediately
5167 // 0 => -1 : block; then set _Event to 0 before returning
5168
5169 guarantee(_ParkHandle != NULL, "Invariant");
5170 // Invariant: Only the thread associated with the Event/PlatformEvent
5171 // may call park().
5172 // Consider: use atomic decrement instead of CAS-loop
5173 int v;
5174 for (;;) {
5175 v = _Event;
5176 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5177 }
5178 guarantee((v == 0) || (v == 1), "invariant");
5179 if (v != 0) return;
5180
5181 // Do this the hard way by blocking ...
5182 // TODO: consider a brief spin here, gated on the success of recent
5183 // spin attempts by this thread.
5184 while (_Event < 0) {
5185 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5186 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5187 }
5188
5189 // Usually we'll find _Event == 0 at this point, but as
5190 // an optional optimization we clear it, just in case can
5191 // multiple unpark() operations drove _Event up to 1.
5192 _Event = 0;
5193 OrderAccess::fence();
5194 guarantee(_Event >= 0, "invariant");
5195 }
5196
5197 void os::PlatformEvent::unpark() {
5198 guarantee(_ParkHandle != NULL, "Invariant");
5199
5200 // Transitions for _Event:
5201 // 0 => 1 : just return
5202 // 1 => 1 : just return
5203 // -1 => either 0 or 1; must signal target thread
5204 // That is, we can safely transition _Event from -1 to either
5205 // 0 or 1.
5206 // See also: "Semaphores in Plan 9" by Mullender & Cox
5207 //
5208 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5209 // that it will take two back-to-back park() calls for the owning
5210 // thread to block. This has the benefit of forcing a spurious return
5211 // from the first park() call after an unpark() call which will help
5212 // shake out uses of park() and unpark() without condition variables.
5213
5214 if (Atomic::xchg(1, &_Event) >= 0) return;
5215
5216 ::SetEvent(_ParkHandle);
5217 }
5218
5219
5220 // JSR166
5221 // -------------------------------------------------------
5222
5223 // The Windows implementation of Park is very straightforward: Basic
5224 // operations on Win32 Events turn out to have the right semantics to
5225 // use them directly. We opportunistically resuse the event inherited
5226 // from Monitor.
5227
5228 void Parker::park(bool isAbsolute, jlong time) {
5229 guarantee(_ParkEvent != NULL, "invariant");
5230 // First, demultiplex/decode time arguments
5231 if (time < 0) { // don't wait
5232 return;
5233 } else if (time == 0 && !isAbsolute) {
5234 time = INFINITE;
5235 } else if (isAbsolute) {
5236 time -= os::javaTimeMillis(); // convert to relative time
5237 if (time <= 0) { // already elapsed
5238 return;
5239 }
5240 } else { // relative
5241 time /= 1000000; // Must coarsen from nanos to millis
5242 if (time == 0) { // Wait for the minimal time unit if zero
5243 time = 1;
5244 }
5245 }
5246
5247 JavaThread* thread = JavaThread::current();
5248
5249 // Don't wait if interrupted or already triggered
5250 if (Thread::is_interrupted(thread, false) ||
5251 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5252 ResetEvent(_ParkEvent);
5253 return;
5254 } else {
5255 ThreadBlockInVM tbivm(thread);
5256 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5257 thread->set_suspend_equivalent();
5258
5259 WaitForSingleObject(_ParkEvent, time);
5260 ResetEvent(_ParkEvent);
5261
5262 // If externally suspended while waiting, re-suspend
5263 if (thread->handle_special_suspend_equivalent_condition()) {
5264 thread->java_suspend_self();
5265 }
5266 }
5267 }
5268
5269 void Parker::unpark() {
5270 guarantee(_ParkEvent != NULL, "invariant");
5271 SetEvent(_ParkEvent);
5272 }
5273
5274 // Run the specified command in a separate process. Return its exit value,
5275 // or -1 on failure (e.g. can't create a new process).
5276 int os::fork_and_exec(char* cmd) {
5277 STARTUPINFO si;
5278 PROCESS_INFORMATION pi;
5279
5280 memset(&si, 0, sizeof(si));
5281 si.cb = sizeof(si);
5282 memset(&pi, 0, sizeof(pi));
5283 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5284 cmd, // command line
5285 NULL, // process security attribute
5286 NULL, // thread security attribute
5287 TRUE, // inherits system handles
5288 0, // no creation flags
5289 NULL, // use parent's environment block
5290 NULL, // use parent's starting directory
5291 &si, // (in) startup information
5292 &pi); // (out) process information
5293
5294 if (rslt) {
5295 // Wait until child process exits.
5296 WaitForSingleObject(pi.hProcess, INFINITE);
5297
5298 DWORD exit_code;
5299 GetExitCodeProcess(pi.hProcess, &exit_code);
5300
5301 // Close process and thread handles.
5302 CloseHandle(pi.hProcess);
5303 CloseHandle(pi.hThread);
5304
5305 return (int)exit_code;
5306 } else {
5307 return -1;
5308 }
5309 }
5310
5311 //--------------------------------------------------------------------------------------------------
5312 // Non-product code
5313
5314 static int mallocDebugIntervalCounter = 0;
5315 static int mallocDebugCounter = 0;
5316 bool os::check_heap(bool force) {
5317 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5318 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5319 // Note: HeapValidate executes two hardware breakpoints when it finds something
5320 // wrong; at these points, eax contains the address of the offending block (I think).
5321 // To get to the exlicit error message(s) below, just continue twice.
5322 //
5323 // Note: we want to check the CRT heap, which is not necessarily located in the
5324 // process default heap.
5325 HANDLE heap = (HANDLE) _get_heap_handle();
5326 if (!heap) {
5327 return true;
5328 }
5329
5330 // If we fail to lock the heap, then gflags.exe has been used
5331 // or some other special heap flag has been set that prevents
5332 // locking. We don't try to walk a heap we can't lock.
5333 if (HeapLock(heap) != 0) {
5334 PROCESS_HEAP_ENTRY phe;
5335 phe.lpData = NULL;
5336 while (HeapWalk(heap, &phe) != 0) {
5337 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5338 !HeapValidate(heap, 0, phe.lpData)) {
5339 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5340 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5341 HeapUnlock(heap);
5342 fatal("corrupted C heap");
5343 }
5344 }
5345 DWORD err = GetLastError();
5346 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5347 HeapUnlock(heap);
5348 fatal("heap walk aborted with error %d", err);
5349 }
5350 HeapUnlock(heap);
5351 }
5352 mallocDebugIntervalCounter = 0;
5353 }
5354 return true;
5355 }
5356
5357
5358 bool os::find(address addr, outputStream* st) {
5359 // Nothing yet
5360 return false;
5361 }
5362
5363 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5364 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5365
5366 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5367 JavaThread* thread = JavaThread::current();
5368 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5369 address addr = (address) exceptionRecord->ExceptionInformation[1];
5370
5371 if (os::is_memory_serialize_page(thread, addr)) {
5372 return EXCEPTION_CONTINUE_EXECUTION;
5373 }
5374 }
5375
5376 return EXCEPTION_CONTINUE_SEARCH;
5377 }
5378
5379 // We don't build a headless jre for Windows
5380 bool os::is_headless_jre() { return false; }
5381
5382 static jint initSock() {
5383 WSADATA wsadata;
5384
5385 if (!os::WinSock2Dll::WinSock2Available()) {
5386 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5387 ::GetLastError());
5388 return JNI_ERR;
5389 }
5390
5391 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5392 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5393 ::GetLastError());
5394 return JNI_ERR;
5395 }
5396 return JNI_OK;
5397 }
5398
5399 struct hostent* os::get_host_by_name(char* name) {
5400 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5401 }
5402
5403 int os::socket_close(int fd) {
5404 return ::closesocket(fd);
5405 }
5406
5407 int os::socket(int domain, int type, int protocol) {
5408 return ::socket(domain, type, protocol);
5409 }
5410
5411 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5412 return ::connect(fd, him, len);
5413 }
5414
5415 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5416 return ::recv(fd, buf, (int)nBytes, flags);
5417 }
5418
5419 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5420 return ::send(fd, buf, (int)nBytes, flags);
5421 }
5422
5423 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5424 return ::send(fd, buf, (int)nBytes, flags);
5425 }
5426
5427 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5428 #if defined(IA32)
5429 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5430 #elif defined (AMD64)
5431 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5432 #endif
5433
5434 // returns true if thread could be suspended,
5435 // false otherwise
5436 static bool do_suspend(HANDLE* h) {
5437 if (h != NULL) {
5438 if (SuspendThread(*h) != ~0) {
5439 return true;
5440 }
5441 }
5442 return false;
5443 }
5444
5445 // resume the thread
5446 // calling resume on an active thread is a no-op
5447 static void do_resume(HANDLE* h) {
5448 if (h != NULL) {
5449 ResumeThread(*h);
5450 }
5451 }
5452
5453 // retrieve a suspend/resume context capable handle
5454 // from the tid. Caller validates handle return value.
5455 void get_thread_handle_for_extended_context(HANDLE* h,
5456 OSThread::thread_id_t tid) {
5457 if (h != NULL) {
5458 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5459 }
5460 }
5461
5462 // Thread sampling implementation
5463 //
5464 void os::SuspendedThreadTask::internal_do_task() {
5465 CONTEXT ctxt;
5466 HANDLE h = NULL;
5467
5468 // get context capable handle for thread
5469 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5470
5471 // sanity
5472 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5473 return;
5474 }
5475
5476 // suspend the thread
5477 if (do_suspend(&h)) {
5478 ctxt.ContextFlags = sampling_context_flags;
5479 // get thread context
5480 GetThreadContext(h, &ctxt);
5481 SuspendedThreadTaskContext context(_thread, &ctxt);
5482 // pass context to Thread Sampling impl
5483 do_task(context);
5484 // resume thread
5485 do_resume(&h);
5486 }
5487
5488 // close handle
5489 CloseHandle(h);
5490 }
5491
5492
5493 // Kernel32 API
5494 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5495 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5496 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5497 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5498 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5499
5500 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5501 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5502 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5503 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5504 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5505
5506
5507 BOOL os::Kernel32Dll::initialized = FALSE;
5508 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5509 assert(initialized && _GetLargePageMinimum != NULL,
5510 "GetLargePageMinimumAvailable() not yet called");
5511 return _GetLargePageMinimum();
5512 }
5513
5514 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5515 if (!initialized) {
5516 initialize();
5517 }
5518 return _GetLargePageMinimum != NULL;
5519 }
5520
5521 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5522 if (!initialized) {
5523 initialize();
5524 }
5525 return _VirtualAllocExNuma != NULL;
5526 }
5527
5528 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5529 SIZE_T bytes, DWORD flags,
5530 DWORD prot, DWORD node) {
5531 assert(initialized && _VirtualAllocExNuma != NULL,
5532 "NUMACallsAvailable() not yet called");
5533
5534 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5535 }
5536
5537 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5538 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5539 "NUMACallsAvailable() not yet called");
5540
5541 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5542 }
5543
5544 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5545 PULONGLONG proc_mask) {
5546 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5547 "NUMACallsAvailable() not yet called");
5548
5549 return _GetNumaNodeProcessorMask(node, proc_mask);
5550 }
5551
5552 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5553 ULONG FrameToCapture,
5554 PVOID* BackTrace,
5555 PULONG BackTraceHash) {
5556 if (!initialized) {
5557 initialize();
5558 }
5559
5560 if (_RtlCaptureStackBackTrace != NULL) {
5561 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5562 BackTrace, BackTraceHash);
5563 } else {
5564 return 0;
5565 }
5566 }
5567
5568 void os::Kernel32Dll::initializeCommon() {
5569 if (!initialized) {
5570 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5571 assert(handle != NULL, "Just check");
5572 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5573 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5574 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5575 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5576 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5577 initialized = TRUE;
5578 }
5579 }
5580
5581 bool os::start_debugging(char *buf, int buflen) {
5582 int len = (int)strlen(buf);
5583 char *p = &buf[len];
5584
5585 jio_snprintf(p, buflen-len,
5586 "\n\n"
5587 "Do you want to debug the problem?\n\n"
5588 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5589 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5590 "Otherwise, select 'No' to abort...",
5591 os::current_process_id(), os::current_thread_id());
5592
5593 bool yes = os::message_box("Unexpected Error", buf);
5594
5595 if (yes) {
5596 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5597 // exception. If VM is running inside a debugger, the debugger will
5598 // catch the exception. Otherwise, the breakpoint exception will reach
5599 // the default windows exception handler, which can spawn a debugger and
5600 // automatically attach to the dying VM.
5601 os::breakpoint();
5602 yes = false;
5603 }
5604 return yes;
5605 }
5606
5607 void os::Kernel32Dll::initialize() {
5608 initializeCommon();
5609 }
5610
5611
5612 // Kernel32 API
5613 inline BOOL os::Kernel32Dll::SwitchToThread() {
5614 return ::SwitchToThread();
5615 }
5616
5617 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5618 return true;
5619 }
5620
5621 // Help tools
5622 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5623 return true;
5624 }
5625
5626 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5627 DWORD th32ProcessId) {
5628 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5629 }
5630
5631 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5632 LPMODULEENTRY32 lpme) {
5633 return ::Module32First(hSnapshot, lpme);
5634 }
5635
5636 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5637 LPMODULEENTRY32 lpme) {
5638 return ::Module32Next(hSnapshot, lpme);
5639 }
5640
5641 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5642 ::GetNativeSystemInfo(lpSystemInfo);
5643 }
5644
5645 // PSAPI API
5646 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5647 HMODULE *lpModule, DWORD cb,
5648 LPDWORD lpcbNeeded) {
5649 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5650 }
5651
5652 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5653 HMODULE hModule,
5654 LPTSTR lpFilename,
5655 DWORD nSize) {
5656 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5657 }
5658
5659 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5660 HMODULE hModule,
5661 LPMODULEINFO lpmodinfo,
5662 DWORD cb) {
5663 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5664 }
5665
5666 inline BOOL os::PSApiDll::PSApiAvailable() {
5667 return true;
5668 }
5669
5670
5671 // WinSock2 API
5672 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5673 LPWSADATA lpWSAData) {
5674 return ::WSAStartup(wVersionRequested, lpWSAData);
5675 }
5676
5677 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5678 return ::gethostbyname(name);
5679 }
5680
5681 inline BOOL os::WinSock2Dll::WinSock2Available() {
5682 return true;
5683 }
5684
5685 // Advapi API
5686 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5687 BOOL DisableAllPrivileges,
5688 PTOKEN_PRIVILEGES NewState,
5689 DWORD BufferLength,
5690 PTOKEN_PRIVILEGES PreviousState,
5691 PDWORD ReturnLength) {
5692 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5693 BufferLength, PreviousState, ReturnLength);
5694 }
5695
5696 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5697 DWORD DesiredAccess,
5698 PHANDLE TokenHandle) {
5699 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5700 }
5701
5702 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5703 LPCTSTR lpName,
5704 PLUID lpLuid) {
5705 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5706 }
5707
5708 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5709 return true;
5710 }
5711
5712 void* os::get_default_process_handle() {
5713 return (void*)GetModuleHandle(NULL);
5714 }
5715
5716 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5717 // which is used to find statically linked in agents.
5718 // Additionally for windows, takes into account __stdcall names.
5719 // Parameters:
5720 // sym_name: Symbol in library we are looking for
5721 // lib_name: Name of library to look in, NULL for shared libs.
5722 // is_absolute_path == true if lib_name is absolute path to agent
5723 // such as "C:/a/b/L.dll"
5724 // == false if only the base name of the library is passed in
5725 // such as "L"
5726 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5727 bool is_absolute_path) {
5728 char *agent_entry_name;
5729 size_t len;
5730 size_t name_len;
5731 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5732 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5733 const char *start;
5734
5735 if (lib_name != NULL) {
5736 len = name_len = strlen(lib_name);
5737 if (is_absolute_path) {
5738 // Need to strip path, prefix and suffix
5739 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5740 lib_name = ++start;
5741 } else {
5742 // Need to check for drive prefix
5743 if ((start = strchr(lib_name, ':')) != NULL) {
5744 lib_name = ++start;
5745 }
5746 }
5747 if (len <= (prefix_len + suffix_len)) {
5748 return NULL;
5749 }
5750 lib_name += prefix_len;
5751 name_len = strlen(lib_name) - suffix_len;
5752 }
5753 }
5754 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5755 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5756 if (agent_entry_name == NULL) {
5757 return NULL;
5758 }
5759 if (lib_name != NULL) {
5760 const char *p = strrchr(sym_name, '@');
5761 if (p != NULL && p != sym_name) {
5762 // sym_name == _Agent_OnLoad@XX
5763 strncpy(agent_entry_name, sym_name, (p - sym_name));
5764 agent_entry_name[(p-sym_name)] = '\0';
5765 // agent_entry_name == _Agent_OnLoad
5766 strcat(agent_entry_name, "_");
5767 strncat(agent_entry_name, lib_name, name_len);
5768 strcat(agent_entry_name, p);
5769 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5770 } else {
5771 strcpy(agent_entry_name, sym_name);
5772 strcat(agent_entry_name, "_");
5773 strncat(agent_entry_name, lib_name, name_len);
5774 }
5775 } else {
5776 strcpy(agent_entry_name, sym_name);
5777 }
5778 return agent_entry_name;
5779 }
5780
5781 #ifndef PRODUCT
5782
5783 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5784 // contiguous memory block at a particular address.
5785 // The test first tries to find a good approximate address to allocate at by using the same
5786 // method to allocate some memory at any address. The test then tries to allocate memory in
5787 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5788 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5789 // the previously allocated memory is available for allocation. The only actual failure
5790 // that is reported is when the test tries to allocate at a particular location but gets a
5791 // different valid one. A NULL return value at this point is not considered an error but may
5792 // be legitimate.
5793 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5794 void TestReserveMemorySpecial_test() {
5795 if (!UseLargePages) {
5796 if (VerboseInternalVMTests) {
5797 tty->print("Skipping test because large pages are disabled");
5798 }
5799 return;
5800 }
5801 // save current value of globals
5802 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5803 bool old_use_numa_interleaving = UseNUMAInterleaving;
5804
5805 // set globals to make sure we hit the correct code path
5806 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5807
5808 // do an allocation at an address selected by the OS to get a good one.
5809 const size_t large_allocation_size = os::large_page_size() * 4;
5810 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5811 if (result == NULL) {
5812 if (VerboseInternalVMTests) {
5813 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5814 large_allocation_size);
5815 }
5816 } else {
5817 os::release_memory_special(result, large_allocation_size);
5818
5819 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5820 // we managed to get it once.
5821 const size_t expected_allocation_size = os::large_page_size();
5822 char* expected_location = result + os::large_page_size();
5823 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5824 if (actual_location == NULL) {
5825 if (VerboseInternalVMTests) {
5826 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5827 expected_location, large_allocation_size);
5828 }
5829 } else {
5830 // release memory
5831 os::release_memory_special(actual_location, expected_allocation_size);
5832 // only now check, after releasing any memory to avoid any leaks.
5833 assert(actual_location == expected_location,
5834 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5835 expected_location, expected_allocation_size, actual_location);
5836 }
5837 }
5838
5839 // restore globals
5840 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5841 UseNUMAInterleaving = old_use_numa_interleaving;
5842 }
5843 #endif // PRODUCT
5844
5845 /*
5846 All the defined signal names for Windows.
5847
5848 NOTE that not all of these names are accepted by FindSignal!
5849
5850 For various reasons some of these may be rejected at runtime.
5851
5852 Here are the names currently accepted by a user of sun.misc.Signal with
5853 1.4.1 (ignoring potential interaction with use of chaining, etc):
5854
5855 (LIST TBD)
5856
5857 */
5858 int os::get_signal_number(const char* name) {
5859 static const struct {
5860 char* name;
5861 int number;
5862 } siglabels [] =
5863 // derived from version 6.0 VC98/include/signal.h
5864 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5865 "FPE", SIGFPE, // floating point exception
5866 "SEGV", SIGSEGV, // segment violation
5867 "INT", SIGINT, // interrupt
5868 "TERM", SIGTERM, // software term signal from kill
5869 "BREAK", SIGBREAK, // Ctrl-Break sequence
5870 "ILL", SIGILL}; // illegal instruction
5871 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
5872 if(!strcmp(name, siglabels[i].name))
5873 return siglabels[i].number;
5874 return -1;
5875 }
5876
5877 // Fast current thread access
5878
5879 int os::win32::_thread_ptr_offset = 0;
5880
5881 static void call_wrapper_dummy() {}
5882
5883 // We need to call the os_exception_wrapper once so that it sets
5884 // up the offset from FS of the thread pointer.
5885 void os::win32::initialize_thread_ptr_offset() {
5886 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5887 NULL, NULL, NULL, NULL);
5888 }