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 uint count = 0;
3419 bool ret = false;
3420 size_t bytes_remaining = bytes;
3421 char * next_protect_addr = addr;
3422
3423 // Use VirtualQuery() to get the chunk size.
3424 while (bytes_remaining) {
3425 MEMORY_BASIC_INFORMATION alloc_info;
3426 VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info));
3427 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3428 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3429 // but we don't distinguish here as both cases are protected by same API.
3430 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3431 assert(ret, "Failed protecting chunk #%u", count);
3432 if (!ret) {
3433 return false;
3434 }
3435
3436 bytes_remaining -= bytes_to_protect;
3437 next_protect_addr += bytes_to_protect;
3438 count++;
3439 }
3440 return ret;
3441 }
3442
3443 // Set protections specified
3444 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3445 bool is_committed) {
3446 unsigned int p = 0;
3447 switch (prot) {
3448 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3449 case MEM_PROT_READ: p = PAGE_READONLY; break;
3450 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3451 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3452 default:
3453 ShouldNotReachHere();
3454 }
3455
3456 DWORD old_status;
3457
3458 // Strange enough, but on Win32 one can change protection only for committed
3459 // memory, not a big deal anyway, as bytes less or equal than 64K
3460 if (!is_committed) {
3461 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3462 "cannot commit protection page");
3463 }
3464 // One cannot use os::guard_memory() here, as on Win32 guard page
3465 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3466 //
3467 // Pages in the region become guard pages. Any attempt to access a guard page
3468 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3469 // the guard page status. Guard pages thus act as a one-time access alarm.
3470 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3471 bool ret;
3472 if (use_individual) {
3473 ret = protect_pages_individually(addr, bytes, p, &old_status);
3474 } else {
3475 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3476 }
3477 #ifdef ASSERT
3478 if (!ret) {
3479 int err = os::get_last_error();
3480 char buf[256];
3481 size_t buf_len = os::lasterror(buf, sizeof(buf));
3482 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3483 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3484 buf_len != 0 ? buf : "<no_error_string>", err);
3485 }
3486 #endif
3487 return ret;
3488 }
3489
3490 bool os::guard_memory(char* addr, size_t bytes) {
3491 DWORD old_status;
3492 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3493 }
3494
3495 bool os::unguard_memory(char* addr, size_t bytes) {
3496 DWORD old_status;
3497 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3498 }
3499
3500 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3501 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3502 void os::numa_make_global(char *addr, size_t bytes) { }
3503 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3504 bool os::numa_topology_changed() { return false; }
3505 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3506 int os::numa_get_group_id() { return 0; }
3507 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3508 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3509 // Provide an answer for UMA systems
3510 ids[0] = 0;
3511 return 1;
3512 } else {
3513 // check for size bigger than actual groups_num
3514 size = MIN2(size, numa_get_groups_num());
3515 for (int i = 0; i < (int)size; i++) {
3516 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3517 }
3518 return size;
3519 }
3520 }
3521
3522 bool os::get_page_info(char *start, page_info* info) {
3523 return false;
3524 }
3525
3526 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3527 page_info* page_found) {
3528 return end;
3529 }
3530
3531 char* os::non_memory_address_word() {
3532 // Must never look like an address returned by reserve_memory,
3533 // even in its subfields (as defined by the CPU immediate fields,
3534 // if the CPU splits constants across multiple instructions).
3535 return (char*)-1;
3536 }
3537
3538 #define MAX_ERROR_COUNT 100
3539 #define SYS_THREAD_ERROR 0xffffffffUL
3540
3541 void os::pd_start_thread(Thread* thread) {
3542 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3543 // Returns previous suspend state:
3544 // 0: Thread was not suspended
3545 // 1: Thread is running now
3546 // >1: Thread is still suspended.
3547 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3548 }
3549
3550 class HighResolutionInterval : public CHeapObj<mtThread> {
3551 // The default timer resolution seems to be 10 milliseconds.
3552 // (Where is this written down?)
3553 // If someone wants to sleep for only a fraction of the default,
3554 // then we set the timer resolution down to 1 millisecond for
3555 // the duration of their interval.
3556 // We carefully set the resolution back, since otherwise we
3557 // seem to incur an overhead (3%?) that we don't need.
3558 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3559 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3560 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3561 // timeBeginPeriod() if the relative error exceeded some threshold.
3562 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3563 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3564 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3565 // resolution timers running.
3566 private:
3567 jlong resolution;
3568 public:
3569 HighResolutionInterval(jlong ms) {
3570 resolution = ms % 10L;
3571 if (resolution != 0) {
3572 MMRESULT result = timeBeginPeriod(1L);
3573 }
3574 }
3575 ~HighResolutionInterval() {
3576 if (resolution != 0) {
3577 MMRESULT result = timeEndPeriod(1L);
3578 }
3579 resolution = 0L;
3580 }
3581 };
3582
3583 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3584 jlong limit = (jlong) MAXDWORD;
3585
3586 while (ms > limit) {
3587 int res;
3588 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3589 return res;
3590 }
3591 ms -= limit;
3592 }
3593
3594 assert(thread == Thread::current(), "thread consistency check");
3595 OSThread* osthread = thread->osthread();
3596 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3597 int result;
3598 if (interruptable) {
3599 assert(thread->is_Java_thread(), "must be java thread");
3600 JavaThread *jt = (JavaThread *) thread;
3601 ThreadBlockInVM tbivm(jt);
3602
3603 jt->set_suspend_equivalent();
3604 // cleared by handle_special_suspend_equivalent_condition() or
3605 // java_suspend_self() via check_and_wait_while_suspended()
3606
3607 HANDLE events[1];
3608 events[0] = osthread->interrupt_event();
3609 HighResolutionInterval *phri=NULL;
3610 if (!ForceTimeHighResolution) {
3611 phri = new HighResolutionInterval(ms);
3612 }
3613 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3614 result = OS_TIMEOUT;
3615 } else {
3616 ResetEvent(osthread->interrupt_event());
3617 osthread->set_interrupted(false);
3618 result = OS_INTRPT;
3619 }
3620 delete phri; //if it is NULL, harmless
3621
3622 // were we externally suspended while we were waiting?
3623 jt->check_and_wait_while_suspended();
3624 } else {
3625 assert(!thread->is_Java_thread(), "must not be java thread");
3626 Sleep((long) ms);
3627 result = OS_TIMEOUT;
3628 }
3629 return result;
3630 }
3631
3632 // Short sleep, direct OS call.
3633 //
3634 // ms = 0, means allow others (if any) to run.
3635 //
3636 void os::naked_short_sleep(jlong ms) {
3637 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3638 Sleep(ms);
3639 }
3640
3641 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3642 void os::infinite_sleep() {
3643 while (true) { // sleep forever ...
3644 Sleep(100000); // ... 100 seconds at a time
3645 }
3646 }
3647
3648 typedef BOOL (WINAPI * STTSignature)(void);
3649
3650 void os::naked_yield() {
3651 // Use either SwitchToThread() or Sleep(0)
3652 // Consider passing back the return value from SwitchToThread().
3653 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3654 SwitchToThread();
3655 } else {
3656 Sleep(0);
3657 }
3658 }
3659
3660 // Win32 only gives you access to seven real priorities at a time,
3661 // so we compress Java's ten down to seven. It would be better
3662 // if we dynamically adjusted relative priorities.
3663
3664 int os::java_to_os_priority[CriticalPriority + 1] = {
3665 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3666 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3667 THREAD_PRIORITY_LOWEST, // 2
3668 THREAD_PRIORITY_BELOW_NORMAL, // 3
3669 THREAD_PRIORITY_BELOW_NORMAL, // 4
3670 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3671 THREAD_PRIORITY_NORMAL, // 6
3672 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3673 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3674 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3675 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3676 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3677 };
3678
3679 int prio_policy1[CriticalPriority + 1] = {
3680 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3681 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3682 THREAD_PRIORITY_LOWEST, // 2
3683 THREAD_PRIORITY_BELOW_NORMAL, // 3
3684 THREAD_PRIORITY_BELOW_NORMAL, // 4
3685 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3686 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3687 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3688 THREAD_PRIORITY_HIGHEST, // 8
3689 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3690 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3691 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3692 };
3693
3694 static int prio_init() {
3695 // If ThreadPriorityPolicy is 1, switch tables
3696 if (ThreadPriorityPolicy == 1) {
3697 int i;
3698 for (i = 0; i < CriticalPriority + 1; i++) {
3699 os::java_to_os_priority[i] = prio_policy1[i];
3700 }
3701 }
3702 if (UseCriticalJavaThreadPriority) {
3703 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3704 }
3705 return 0;
3706 }
3707
3708 OSReturn os::set_native_priority(Thread* thread, int priority) {
3709 if (!UseThreadPriorities) return OS_OK;
3710 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3711 return ret ? OS_OK : OS_ERR;
3712 }
3713
3714 OSReturn os::get_native_priority(const Thread* const thread,
3715 int* priority_ptr) {
3716 if (!UseThreadPriorities) {
3717 *priority_ptr = java_to_os_priority[NormPriority];
3718 return OS_OK;
3719 }
3720 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3721 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3722 assert(false, "GetThreadPriority failed");
3723 return OS_ERR;
3724 }
3725 *priority_ptr = os_prio;
3726 return OS_OK;
3727 }
3728
3729
3730 // Hint to the underlying OS that a task switch would not be good.
3731 // Void return because it's a hint and can fail.
3732 void os::hint_no_preempt() {}
3733
3734 void os::interrupt(Thread* thread) {
3735 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3736 Threads_lock->owned_by_self(),
3737 "possibility of dangling Thread pointer");
3738
3739 OSThread* osthread = thread->osthread();
3740 osthread->set_interrupted(true);
3741 // More than one thread can get here with the same value of osthread,
3742 // resulting in multiple notifications. We do, however, want the store
3743 // to interrupted() to be visible to other threads before we post
3744 // the interrupt event.
3745 OrderAccess::release();
3746 SetEvent(osthread->interrupt_event());
3747 // For JSR166: unpark after setting status
3748 if (thread->is_Java_thread()) {
3749 ((JavaThread*)thread)->parker()->unpark();
3750 }
3751
3752 ParkEvent * ev = thread->_ParkEvent;
3753 if (ev != NULL) ev->unpark();
3754 }
3755
3756
3757 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3758 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3759 "possibility of dangling Thread pointer");
3760
3761 OSThread* osthread = thread->osthread();
3762 // There is no synchronization between the setting of the interrupt
3763 // and it being cleared here. It is critical - see 6535709 - that
3764 // we only clear the interrupt state, and reset the interrupt event,
3765 // if we are going to report that we were indeed interrupted - else
3766 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3767 // depending on the timing. By checking thread interrupt event to see
3768 // if the thread gets real interrupt thus prevent spurious wakeup.
3769 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3770 if (interrupted && clear_interrupted) {
3771 osthread->set_interrupted(false);
3772 ResetEvent(osthread->interrupt_event());
3773 } // Otherwise leave the interrupted state alone
3774
3775 return interrupted;
3776 }
3777
3778 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3779 ExtendedPC os::get_thread_pc(Thread* thread) {
3780 CONTEXT context;
3781 context.ContextFlags = CONTEXT_CONTROL;
3782 HANDLE handle = thread->osthread()->thread_handle();
3783 #ifdef _M_IA64
3784 assert(0, "Fix get_thread_pc");
3785 return ExtendedPC(NULL);
3786 #else
3787 if (GetThreadContext(handle, &context)) {
3788 #ifdef _M_AMD64
3789 return ExtendedPC((address) context.Rip);
3790 #else
3791 return ExtendedPC((address) context.Eip);
3792 #endif
3793 } else {
3794 return ExtendedPC(NULL);
3795 }
3796 #endif
3797 }
3798
3799 // GetCurrentThreadId() returns DWORD
3800 intx os::current_thread_id() { return GetCurrentThreadId(); }
3801
3802 static int _initial_pid = 0;
3803
3804 int os::current_process_id() {
3805 return (_initial_pid ? _initial_pid : _getpid());
3806 }
3807
3808 int os::win32::_vm_page_size = 0;
3809 int os::win32::_vm_allocation_granularity = 0;
3810 int os::win32::_processor_type = 0;
3811 // Processor level is not available on non-NT systems, use vm_version instead
3812 int os::win32::_processor_level = 0;
3813 julong os::win32::_physical_memory = 0;
3814 size_t os::win32::_default_stack_size = 0;
3815
3816 intx os::win32::_os_thread_limit = 0;
3817 volatile intx os::win32::_os_thread_count = 0;
3818
3819 bool os::win32::_is_nt = false;
3820 bool os::win32::_is_windows_2003 = false;
3821 bool os::win32::_is_windows_server = false;
3822
3823 // 6573254
3824 // Currently, the bug is observed across all the supported Windows releases,
3825 // including the latest one (as of this writing - Windows Server 2012 R2)
3826 bool os::win32::_has_exit_bug = true;
3827 bool os::win32::_has_performance_count = 0;
3828
3829 void os::win32::initialize_system_info() {
3830 SYSTEM_INFO si;
3831 GetSystemInfo(&si);
3832 _vm_page_size = si.dwPageSize;
3833 _vm_allocation_granularity = si.dwAllocationGranularity;
3834 _processor_type = si.dwProcessorType;
3835 _processor_level = si.wProcessorLevel;
3836 set_processor_count(si.dwNumberOfProcessors);
3837
3838 MEMORYSTATUSEX ms;
3839 ms.dwLength = sizeof(ms);
3840
3841 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3842 // dwMemoryLoad (% of memory in use)
3843 GlobalMemoryStatusEx(&ms);
3844 _physical_memory = ms.ullTotalPhys;
3845
3846 OSVERSIONINFOEX oi;
3847 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3848 GetVersionEx((OSVERSIONINFO*)&oi);
3849 switch (oi.dwPlatformId) {
3850 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3851 case VER_PLATFORM_WIN32_NT:
3852 _is_nt = true;
3853 {
3854 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3855 if (os_vers == 5002) {
3856 _is_windows_2003 = true;
3857 }
3858 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3859 oi.wProductType == VER_NT_SERVER) {
3860 _is_windows_server = true;
3861 }
3862 }
3863 break;
3864 default: fatal("Unknown platform");
3865 }
3866
3867 _default_stack_size = os::current_stack_size();
3868 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3869 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3870 "stack size not a multiple of page size");
3871
3872 initialize_performance_counter();
3873 }
3874
3875
3876 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3877 int ebuflen) {
3878 char path[MAX_PATH];
3879 DWORD size;
3880 DWORD pathLen = (DWORD)sizeof(path);
3881 HINSTANCE result = NULL;
3882
3883 // only allow library name without path component
3884 assert(strchr(name, '\\') == NULL, "path not allowed");
3885 assert(strchr(name, ':') == NULL, "path not allowed");
3886 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3887 jio_snprintf(ebuf, ebuflen,
3888 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3889 return NULL;
3890 }
3891
3892 // search system directory
3893 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3894 if (size >= pathLen) {
3895 return NULL; // truncated
3896 }
3897 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3898 return NULL; // truncated
3899 }
3900 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3901 return result;
3902 }
3903 }
3904
3905 // try Windows directory
3906 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3907 if (size >= pathLen) {
3908 return NULL; // truncated
3909 }
3910 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3911 return NULL; // truncated
3912 }
3913 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3914 return result;
3915 }
3916 }
3917
3918 jio_snprintf(ebuf, ebuflen,
3919 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3920 return NULL;
3921 }
3922
3923 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3924
3925 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3926 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3927 return TRUE;
3928 }
3929
3930 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3931 // Basic approach:
3932 // - Each exiting thread registers its intent to exit and then does so.
3933 // - A thread trying to terminate the process must wait for all
3934 // threads currently exiting to complete their exit.
3935
3936 if (os::win32::has_exit_bug()) {
3937 // The array holds handles of the threads that have started exiting by calling
3938 // _endthreadex().
3939 // Should be large enough to avoid blocking the exiting thread due to lack of
3940 // a free slot.
3941 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3942 static int handle_count = 0;
3943
3944 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3945 static CRITICAL_SECTION crit_sect;
3946 static volatile jint process_exiting = 0;
3947 int i, j;
3948 DWORD res;
3949 HANDLE hproc, hthr;
3950
3951 // The first thread that reached this point, initializes the critical section.
3952 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3953 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3954 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3955 EnterCriticalSection(&crit_sect);
3956
3957 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3958 // Remove from the array those handles of the threads that have completed exiting.
3959 for (i = 0, j = 0; i < handle_count; ++i) {
3960 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3961 if (res == WAIT_TIMEOUT) {
3962 handles[j++] = handles[i];
3963 } else {
3964 if (res == WAIT_FAILED) {
3965 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3966 GetLastError(), __FILE__, __LINE__);
3967 }
3968 // Don't keep the handle, if we failed waiting for it.
3969 CloseHandle(handles[i]);
3970 }
3971 }
3972
3973 // If there's no free slot in the array of the kept handles, we'll have to
3974 // wait until at least one thread completes exiting.
3975 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3976 // Raise the priority of the oldest exiting thread to increase its chances
3977 // to complete sooner.
3978 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3979 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3980 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3981 i = (res - WAIT_OBJECT_0);
3982 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3983 for (; i < handle_count; ++i) {
3984 handles[i] = handles[i + 1];
3985 }
3986 } else {
3987 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3988 (res == WAIT_FAILED ? "failed" : "timed out"),
3989 GetLastError(), __FILE__, __LINE__);
3990 // Don't keep handles, if we failed waiting for them.
3991 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3992 CloseHandle(handles[i]);
3993 }
3994 handle_count = 0;
3995 }
3996 }
3997
3998 // Store a duplicate of the current thread handle in the array of handles.
3999 hproc = GetCurrentProcess();
4000 hthr = GetCurrentThread();
4001 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
4002 0, FALSE, DUPLICATE_SAME_ACCESS)) {
4003 warning("DuplicateHandle failed (%u) in %s: %d\n",
4004 GetLastError(), __FILE__, __LINE__);
4005 } else {
4006 ++handle_count;
4007 }
4008
4009 // The current exiting thread has stored its handle in the array, and now
4010 // should leave the critical section before calling _endthreadex().
4011
4012 } else if (what != EPT_THREAD) {
4013 if (handle_count > 0) {
4014 // Before ending the process, make sure all the threads that had called
4015 // _endthreadex() completed.
4016
4017 // Set the priority level of the current thread to the same value as
4018 // the priority level of exiting threads.
4019 // This is to ensure it will be given a fair chance to execute if
4020 // the timeout expires.
4021 hthr = GetCurrentThread();
4022 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
4023 for (i = 0; i < handle_count; ++i) {
4024 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
4025 }
4026 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
4027 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4028 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4029 (res == WAIT_FAILED ? "failed" : "timed out"),
4030 GetLastError(), __FILE__, __LINE__);
4031 }
4032 for (i = 0; i < handle_count; ++i) {
4033 CloseHandle(handles[i]);
4034 }
4035 handle_count = 0;
4036 }
4037
4038 OrderAccess::release_store(&process_exiting, 1);
4039 }
4040
4041 LeaveCriticalSection(&crit_sect);
4042 }
4043
4044 if (what == EPT_THREAD) {
4045 while (OrderAccess::load_acquire(&process_exiting) != 0) {
4046 // Some other thread is about to call exit(), so we
4047 // don't let the current thread proceed to _endthreadex()
4048 SuspendThread(GetCurrentThread());
4049 // Avoid busy-wait loop, if SuspendThread() failed.
4050 Sleep(EXIT_TIMEOUT);
4051 }
4052 }
4053 }
4054
4055 // We are here if either
4056 // - there's no 'race at exit' bug on this OS release;
4057 // - initialization of the critical section failed (unlikely);
4058 // - the current thread has stored its handle and left the critical section;
4059 // - the process-exiting thread has raised the flag and left the critical section.
4060 if (what == EPT_THREAD) {
4061 _endthreadex((unsigned)exit_code);
4062 } else if (what == EPT_PROCESS) {
4063 ::exit(exit_code);
4064 } else {
4065 _exit(exit_code);
4066 }
4067
4068 // Should not reach here
4069 return exit_code;
4070 }
4071
4072 #undef EXIT_TIMEOUT
4073
4074 void os::win32::setmode_streams() {
4075 _setmode(_fileno(stdin), _O_BINARY);
4076 _setmode(_fileno(stdout), _O_BINARY);
4077 _setmode(_fileno(stderr), _O_BINARY);
4078 }
4079
4080
4081 bool os::is_debugger_attached() {
4082 return IsDebuggerPresent() ? true : false;
4083 }
4084
4085
4086 void os::wait_for_keypress_at_exit(void) {
4087 if (PauseAtExit) {
4088 fprintf(stderr, "Press any key to continue...\n");
4089 fgetc(stdin);
4090 }
4091 }
4092
4093
4094 bool os::message_box(const char* title, const char* message) {
4095 int result = MessageBox(NULL, message, title,
4096 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4097 return result == IDYES;
4098 }
4099
4100 #ifndef PRODUCT
4101 #ifndef _WIN64
4102 // Helpers to check whether NX protection is enabled
4103 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4104 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4105 pex->ExceptionRecord->NumberParameters > 0 &&
4106 pex->ExceptionRecord->ExceptionInformation[0] ==
4107 EXCEPTION_INFO_EXEC_VIOLATION) {
4108 return EXCEPTION_EXECUTE_HANDLER;
4109 }
4110 return EXCEPTION_CONTINUE_SEARCH;
4111 }
4112
4113 void nx_check_protection() {
4114 // If NX is enabled we'll get an exception calling into code on the stack
4115 char code[] = { (char)0xC3 }; // ret
4116 void *code_ptr = (void *)code;
4117 __try {
4118 __asm call code_ptr
4119 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4120 tty->print_raw_cr("NX protection detected.");
4121 }
4122 }
4123 #endif // _WIN64
4124 #endif // PRODUCT
4125
4126 // this is called _before_ the global arguments have been parsed
4127 void os::init(void) {
4128 _initial_pid = _getpid();
4129
4130 init_random(1234567);
4131
4132 win32::initialize_system_info();
4133 win32::setmode_streams();
4134 init_page_sizes((size_t) win32::vm_page_size());
4135
4136 // This may be overridden later when argument processing is done.
4137 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4138 os::win32::is_windows_2003());
4139
4140 // Initialize main_process and main_thread
4141 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4142 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4143 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4144 fatal("DuplicateHandle failed\n");
4145 }
4146 main_thread_id = (int) GetCurrentThreadId();
4147
4148 // initialize fast thread access - only used for 32-bit
4149 win32::initialize_thread_ptr_offset();
4150 }
4151
4152 // To install functions for atexit processing
4153 extern "C" {
4154 static void perfMemory_exit_helper() {
4155 perfMemory_exit();
4156 }
4157 }
4158
4159 static jint initSock();
4160
4161 // this is called _after_ the global arguments have been parsed
4162 jint os::init_2(void) {
4163 // Allocate a single page and mark it as readable for safepoint polling
4164 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4165 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4166
4167 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4168 guarantee(return_page != NULL, "Commit Failed for polling page");
4169
4170 os::set_polling_page(polling_page);
4171
4172 #ifndef PRODUCT
4173 if (Verbose && PrintMiscellaneous) {
4174 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4175 (intptr_t)polling_page);
4176 }
4177 #endif
4178
4179 if (!UseMembar) {
4180 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4181 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4182
4183 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4184 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4185
4186 os::set_memory_serialize_page(mem_serialize_page);
4187
4188 #ifndef PRODUCT
4189 if (Verbose && PrintMiscellaneous) {
4190 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4191 (intptr_t)mem_serialize_page);
4192 }
4193 #endif
4194 }
4195
4196 // Setup Windows Exceptions
4197
4198 // for debugging float code generation bugs
4199 if (ForceFloatExceptions) {
4200 #ifndef _WIN64
4201 static long fp_control_word = 0;
4202 __asm { fstcw fp_control_word }
4203 // see Intel PPro Manual, Vol. 2, p 7-16
4204 const long precision = 0x20;
4205 const long underflow = 0x10;
4206 const long overflow = 0x08;
4207 const long zero_div = 0x04;
4208 const long denorm = 0x02;
4209 const long invalid = 0x01;
4210 fp_control_word |= invalid;
4211 __asm { fldcw fp_control_word }
4212 #endif
4213 }
4214
4215 // If stack_commit_size is 0, windows will reserve the default size,
4216 // but only commit a small portion of it.
4217 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4218 size_t default_reserve_size = os::win32::default_stack_size();
4219 size_t actual_reserve_size = stack_commit_size;
4220 if (stack_commit_size < default_reserve_size) {
4221 // If stack_commit_size == 0, we want this too
4222 actual_reserve_size = default_reserve_size;
4223 }
4224
4225 // Check minimum allowable stack size for thread creation and to initialize
4226 // the java system classes, including StackOverflowError - depends on page
4227 // size. Add a page for compiler2 recursion in main thread.
4228 // Add in 2*BytesPerWord times page size to account for VM stack during
4229 // class initialization depending on 32 or 64 bit VM.
4230 size_t min_stack_allowed =
4231 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4232 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4233 if (actual_reserve_size < min_stack_allowed) {
4234 tty->print_cr("\nThe stack size specified is too small, "
4235 "Specify at least %dk",
4236 min_stack_allowed / K);
4237 return JNI_ERR;
4238 }
4239
4240 JavaThread::set_stack_size_at_create(stack_commit_size);
4241
4242 // Calculate theoretical max. size of Threads to guard gainst artifical
4243 // out-of-memory situations, where all available address-space has been
4244 // reserved by thread stacks.
4245 assert(actual_reserve_size != 0, "Must have a stack");
4246
4247 // Calculate the thread limit when we should start doing Virtual Memory
4248 // banging. Currently when the threads will have used all but 200Mb of space.
4249 //
4250 // TODO: consider performing a similar calculation for commit size instead
4251 // as reserve size, since on a 64-bit platform we'll run into that more
4252 // often than running out of virtual memory space. We can use the
4253 // lower value of the two calculations as the os_thread_limit.
4254 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4255 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4256
4257 // at exit methods are called in the reverse order of their registration.
4258 // there is no limit to the number of functions registered. atexit does
4259 // not set errno.
4260
4261 if (PerfAllowAtExitRegistration) {
4262 // only register atexit functions if PerfAllowAtExitRegistration is set.
4263 // atexit functions can be delayed until process exit time, which
4264 // can be problematic for embedded VM situations. Embedded VMs should
4265 // call DestroyJavaVM() to assure that VM resources are released.
4266
4267 // note: perfMemory_exit_helper atexit function may be removed in
4268 // the future if the appropriate cleanup code can be added to the
4269 // VM_Exit VMOperation's doit method.
4270 if (atexit(perfMemory_exit_helper) != 0) {
4271 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4272 }
4273 }
4274
4275 #ifndef _WIN64
4276 // Print something if NX is enabled (win32 on AMD64)
4277 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4278 #endif
4279
4280 // initialize thread priority policy
4281 prio_init();
4282
4283 if (UseNUMA && !ForceNUMA) {
4284 UseNUMA = false; // We don't fully support this yet
4285 }
4286
4287 if (UseNUMAInterleaving) {
4288 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4289 bool success = numa_interleaving_init();
4290 if (!success) UseNUMAInterleaving = false;
4291 }
4292
4293 if (initSock() != JNI_OK) {
4294 return JNI_ERR;
4295 }
4296
4297 return JNI_OK;
4298 }
4299
4300 // Mark the polling page as unreadable
4301 void os::make_polling_page_unreadable(void) {
4302 DWORD old_status;
4303 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4304 PAGE_NOACCESS, &old_status)) {
4305 fatal("Could not disable polling page");
4306 }
4307 }
4308
4309 // Mark the polling page as readable
4310 void os::make_polling_page_readable(void) {
4311 DWORD old_status;
4312 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4313 PAGE_READONLY, &old_status)) {
4314 fatal("Could not enable polling page");
4315 }
4316 }
4317
4318
4319 int os::stat(const char *path, struct stat *sbuf) {
4320 char pathbuf[MAX_PATH];
4321 if (strlen(path) > MAX_PATH - 1) {
4322 errno = ENAMETOOLONG;
4323 return -1;
4324 }
4325 os::native_path(strcpy(pathbuf, path));
4326 int ret = ::stat(pathbuf, sbuf);
4327 if (sbuf != NULL && UseUTCFileTimestamp) {
4328 // Fix for 6539723. st_mtime returned from stat() is dependent on
4329 // the system timezone and so can return different values for the
4330 // same file if/when daylight savings time changes. This adjustment
4331 // makes sure the same timestamp is returned regardless of the TZ.
4332 //
4333 // See:
4334 // http://msdn.microsoft.com/library/
4335 // default.asp?url=/library/en-us/sysinfo/base/
4336 // time_zone_information_str.asp
4337 // and
4338 // http://msdn.microsoft.com/library/default.asp?url=
4339 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4340 //
4341 // NOTE: there is a insidious bug here: If the timezone is changed
4342 // after the call to stat() but before 'GetTimeZoneInformation()', then
4343 // the adjustment we do here will be wrong and we'll return the wrong
4344 // value (which will likely end up creating an invalid class data
4345 // archive). Absent a better API for this, or some time zone locking
4346 // mechanism, we'll have to live with this risk.
4347 TIME_ZONE_INFORMATION tz;
4348 DWORD tzid = GetTimeZoneInformation(&tz);
4349 int daylightBias =
4350 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4351 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4352 }
4353 return ret;
4354 }
4355
4356
4357 #define FT2INT64(ft) \
4358 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4359
4360
4361 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4362 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4363 // of a thread.
4364 //
4365 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4366 // the fast estimate available on the platform.
4367
4368 // current_thread_cpu_time() is not optimized for Windows yet
4369 jlong os::current_thread_cpu_time() {
4370 // return user + sys since the cost is the same
4371 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4372 }
4373
4374 jlong os::thread_cpu_time(Thread* thread) {
4375 // consistent with what current_thread_cpu_time() returns.
4376 return os::thread_cpu_time(thread, true /* user+sys */);
4377 }
4378
4379 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4380 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4381 }
4382
4383 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4384 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4385 // If this function changes, os::is_thread_cpu_time_supported() should too
4386 if (os::win32::is_nt()) {
4387 FILETIME CreationTime;
4388 FILETIME ExitTime;
4389 FILETIME KernelTime;
4390 FILETIME UserTime;
4391
4392 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4393 &ExitTime, &KernelTime, &UserTime) == 0) {
4394 return -1;
4395 } else if (user_sys_cpu_time) {
4396 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4397 } else {
4398 return FT2INT64(UserTime) * 100;
4399 }
4400 } else {
4401 return (jlong) timeGetTime() * 1000000;
4402 }
4403 }
4404
4405 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4406 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4407 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4408 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4409 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4410 }
4411
4412 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4413 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4414 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4415 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4416 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4417 }
4418
4419 bool os::is_thread_cpu_time_supported() {
4420 // see os::thread_cpu_time
4421 if (os::win32::is_nt()) {
4422 FILETIME CreationTime;
4423 FILETIME ExitTime;
4424 FILETIME KernelTime;
4425 FILETIME UserTime;
4426
4427 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4428 &KernelTime, &UserTime) == 0) {
4429 return false;
4430 } else {
4431 return true;
4432 }
4433 } else {
4434 return false;
4435 }
4436 }
4437
4438 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4439 // It does have primitives (PDH API) to get CPU usage and run queue length.
4440 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4441 // If we wanted to implement loadavg on Windows, we have a few options:
4442 //
4443 // a) Query CPU usage and run queue length and "fake" an answer by
4444 // returning the CPU usage if it's under 100%, and the run queue
4445 // length otherwise. It turns out that querying is pretty slow
4446 // on Windows, on the order of 200 microseconds on a fast machine.
4447 // Note that on the Windows the CPU usage value is the % usage
4448 // since the last time the API was called (and the first call
4449 // returns 100%), so we'd have to deal with that as well.
4450 //
4451 // b) Sample the "fake" answer using a sampling thread and store
4452 // the answer in a global variable. The call to loadavg would
4453 // just return the value of the global, avoiding the slow query.
4454 //
4455 // c) Sample a better answer using exponential decay to smooth the
4456 // value. This is basically the algorithm used by UNIX kernels.
4457 //
4458 // Note that sampling thread starvation could affect both (b) and (c).
4459 int os::loadavg(double loadavg[], int nelem) {
4460 return -1;
4461 }
4462
4463
4464 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4465 bool os::dont_yield() {
4466 return DontYieldALot;
4467 }
4468
4469 // This method is a slightly reworked copy of JDK's sysOpen
4470 // from src/windows/hpi/src/sys_api_md.c
4471
4472 int os::open(const char *path, int oflag, int mode) {
4473 char pathbuf[MAX_PATH];
4474
4475 if (strlen(path) > MAX_PATH - 1) {
4476 errno = ENAMETOOLONG;
4477 return -1;
4478 }
4479 os::native_path(strcpy(pathbuf, path));
4480 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4481 }
4482
4483 FILE* os::open(int fd, const char* mode) {
4484 return ::_fdopen(fd, mode);
4485 }
4486
4487 // Is a (classpath) directory empty?
4488 bool os::dir_is_empty(const char* path) {
4489 WIN32_FIND_DATA fd;
4490 HANDLE f = FindFirstFile(path, &fd);
4491 if (f == INVALID_HANDLE_VALUE) {
4492 return true;
4493 }
4494 FindClose(f);
4495 return false;
4496 }
4497
4498 // create binary file, rewriting existing file if required
4499 int os::create_binary_file(const char* path, bool rewrite_existing) {
4500 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4501 if (!rewrite_existing) {
4502 oflags |= _O_EXCL;
4503 }
4504 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4505 }
4506
4507 // return current position of file pointer
4508 jlong os::current_file_offset(int fd) {
4509 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4510 }
4511
4512 // move file pointer to the specified offset
4513 jlong os::seek_to_file_offset(int fd, jlong offset) {
4514 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4515 }
4516
4517
4518 jlong os::lseek(int fd, jlong offset, int whence) {
4519 return (jlong) ::_lseeki64(fd, offset, whence);
4520 }
4521
4522 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4523 OVERLAPPED ov;
4524 DWORD nread;
4525 BOOL result;
4526
4527 ZeroMemory(&ov, sizeof(ov));
4528 ov.Offset = (DWORD)offset;
4529 ov.OffsetHigh = (DWORD)(offset >> 32);
4530
4531 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4532
4533 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4534
4535 return result ? nread : 0;
4536 }
4537
4538
4539 // This method is a slightly reworked copy of JDK's sysNativePath
4540 // from src/windows/hpi/src/path_md.c
4541
4542 // Convert a pathname to native format. On win32, this involves forcing all
4543 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4544 // sometimes rejects '/') and removing redundant separators. The input path is
4545 // assumed to have been converted into the character encoding used by the local
4546 // system. Because this might be a double-byte encoding, care is taken to
4547 // treat double-byte lead characters correctly.
4548 //
4549 // This procedure modifies the given path in place, as the result is never
4550 // longer than the original. There is no error return; this operation always
4551 // succeeds.
4552 char * os::native_path(char *path) {
4553 char *src = path, *dst = path, *end = path;
4554 char *colon = NULL; // If a drive specifier is found, this will
4555 // point to the colon following the drive letter
4556
4557 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4558 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4559 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4560
4561 // Check for leading separators
4562 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4563 while (isfilesep(*src)) {
4564 src++;
4565 }
4566
4567 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4568 // Remove leading separators if followed by drive specifier. This
4569 // hack is necessary to support file URLs containing drive
4570 // specifiers (e.g., "file://c:/path"). As a side effect,
4571 // "/c:/path" can be used as an alternative to "c:/path".
4572 *dst++ = *src++;
4573 colon = dst;
4574 *dst++ = ':';
4575 src++;
4576 } else {
4577 src = path;
4578 if (isfilesep(src[0]) && isfilesep(src[1])) {
4579 // UNC pathname: Retain first separator; leave src pointed at
4580 // second separator so that further separators will be collapsed
4581 // into the second separator. The result will be a pathname
4582 // beginning with "\\\\" followed (most likely) by a host name.
4583 src = dst = path + 1;
4584 path[0] = '\\'; // Force first separator to '\\'
4585 }
4586 }
4587
4588 end = dst;
4589
4590 // Remove redundant separators from remainder of path, forcing all
4591 // separators to be '\\' rather than '/'. Also, single byte space
4592 // characters are removed from the end of the path because those
4593 // are not legal ending characters on this operating system.
4594 //
4595 while (*src != '\0') {
4596 if (isfilesep(*src)) {
4597 *dst++ = '\\'; src++;
4598 while (isfilesep(*src)) src++;
4599 if (*src == '\0') {
4600 // Check for trailing separator
4601 end = dst;
4602 if (colon == dst - 2) break; // "z:\\"
4603 if (dst == path + 1) break; // "\\"
4604 if (dst == path + 2 && isfilesep(path[0])) {
4605 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4606 // beginning of a UNC pathname. Even though it is not, by
4607 // itself, a valid UNC pathname, we leave it as is in order
4608 // to be consistent with the path canonicalizer as well
4609 // as the win32 APIs, which treat this case as an invalid
4610 // UNC pathname rather than as an alias for the root
4611 // directory of the current drive.
4612 break;
4613 }
4614 end = --dst; // Path does not denote a root directory, so
4615 // remove trailing separator
4616 break;
4617 }
4618 end = dst;
4619 } else {
4620 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4621 *dst++ = *src++;
4622 if (*src) *dst++ = *src++;
4623 end = dst;
4624 } else { // Copy a single-byte character
4625 char c = *src++;
4626 *dst++ = c;
4627 // Space is not a legal ending character
4628 if (c != ' ') end = dst;
4629 }
4630 }
4631 }
4632
4633 *end = '\0';
4634
4635 // For "z:", add "." to work around a bug in the C runtime library
4636 if (colon == dst - 1) {
4637 path[2] = '.';
4638 path[3] = '\0';
4639 }
4640
4641 return path;
4642 }
4643
4644 // This code is a copy of JDK's sysSetLength
4645 // from src/windows/hpi/src/sys_api_md.c
4646
4647 int os::ftruncate(int fd, jlong length) {
4648 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4649 long high = (long)(length >> 32);
4650 DWORD ret;
4651
4652 if (h == (HANDLE)(-1)) {
4653 return -1;
4654 }
4655
4656 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4657 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4658 return -1;
4659 }
4660
4661 if (::SetEndOfFile(h) == FALSE) {
4662 return -1;
4663 }
4664
4665 return 0;
4666 }
4667
4668
4669 // This code is a copy of JDK's sysSync
4670 // from src/windows/hpi/src/sys_api_md.c
4671 // except for the legacy workaround for a bug in Win 98
4672
4673 int os::fsync(int fd) {
4674 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4675
4676 if ((!::FlushFileBuffers(handle)) &&
4677 (GetLastError() != ERROR_ACCESS_DENIED)) {
4678 // from winerror.h
4679 return -1;
4680 }
4681 return 0;
4682 }
4683
4684 static int nonSeekAvailable(int, long *);
4685 static int stdinAvailable(int, long *);
4686
4687 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4688 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4689
4690 // This code is a copy of JDK's sysAvailable
4691 // from src/windows/hpi/src/sys_api_md.c
4692
4693 int os::available(int fd, jlong *bytes) {
4694 jlong cur, end;
4695 struct _stati64 stbuf64;
4696
4697 if (::_fstati64(fd, &stbuf64) >= 0) {
4698 int mode = stbuf64.st_mode;
4699 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4700 int ret;
4701 long lpbytes;
4702 if (fd == 0) {
4703 ret = stdinAvailable(fd, &lpbytes);
4704 } else {
4705 ret = nonSeekAvailable(fd, &lpbytes);
4706 }
4707 (*bytes) = (jlong)(lpbytes);
4708 return ret;
4709 }
4710 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4711 return FALSE;
4712 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4713 return FALSE;
4714 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4715 return FALSE;
4716 }
4717 *bytes = end - cur;
4718 return TRUE;
4719 } else {
4720 return FALSE;
4721 }
4722 }
4723
4724 // This code is a copy of JDK's nonSeekAvailable
4725 // from src/windows/hpi/src/sys_api_md.c
4726
4727 static int nonSeekAvailable(int fd, long *pbytes) {
4728 // This is used for available on non-seekable devices
4729 // (like both named and anonymous pipes, such as pipes
4730 // connected to an exec'd process).
4731 // Standard Input is a special case.
4732 HANDLE han;
4733
4734 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4735 return FALSE;
4736 }
4737
4738 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4739 // PeekNamedPipe fails when at EOF. In that case we
4740 // simply make *pbytes = 0 which is consistent with the
4741 // behavior we get on Solaris when an fd is at EOF.
4742 // The only alternative is to raise an Exception,
4743 // which isn't really warranted.
4744 //
4745 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4746 return FALSE;
4747 }
4748 *pbytes = 0;
4749 }
4750 return TRUE;
4751 }
4752
4753 #define MAX_INPUT_EVENTS 2000
4754
4755 // This code is a copy of JDK's stdinAvailable
4756 // from src/windows/hpi/src/sys_api_md.c
4757
4758 static int stdinAvailable(int fd, long *pbytes) {
4759 HANDLE han;
4760 DWORD numEventsRead = 0; // Number of events read from buffer
4761 DWORD numEvents = 0; // Number of events in buffer
4762 DWORD i = 0; // Loop index
4763 DWORD curLength = 0; // Position marker
4764 DWORD actualLength = 0; // Number of bytes readable
4765 BOOL error = FALSE; // Error holder
4766 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4767
4768 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4769 return FALSE;
4770 }
4771
4772 // Construct an array of input records in the console buffer
4773 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4774 if (error == 0) {
4775 return nonSeekAvailable(fd, pbytes);
4776 }
4777
4778 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4779 if (numEvents > MAX_INPUT_EVENTS) {
4780 numEvents = MAX_INPUT_EVENTS;
4781 }
4782
4783 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4784 if (lpBuffer == NULL) {
4785 return FALSE;
4786 }
4787
4788 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4789 if (error == 0) {
4790 os::free(lpBuffer);
4791 return FALSE;
4792 }
4793
4794 // Examine input records for the number of bytes available
4795 for (i=0; i<numEvents; i++) {
4796 if (lpBuffer[i].EventType == KEY_EVENT) {
4797
4798 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4799 &(lpBuffer[i].Event);
4800 if (keyRecord->bKeyDown == TRUE) {
4801 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4802 curLength++;
4803 if (*keyPressed == '\r') {
4804 actualLength = curLength;
4805 }
4806 }
4807 }
4808 }
4809
4810 if (lpBuffer != NULL) {
4811 os::free(lpBuffer);
4812 }
4813
4814 *pbytes = (long) actualLength;
4815 return TRUE;
4816 }
4817
4818 // Map a block of memory.
4819 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4820 char *addr, size_t bytes, bool read_only,
4821 bool allow_exec) {
4822 HANDLE hFile;
4823 char* base;
4824
4825 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4826 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4827 if (hFile == NULL) {
4828 if (PrintMiscellaneous && Verbose) {
4829 DWORD err = GetLastError();
4830 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4831 }
4832 return NULL;
4833 }
4834
4835 if (allow_exec) {
4836 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4837 // unless it comes from a PE image (which the shared archive is not.)
4838 // Even VirtualProtect refuses to give execute access to mapped memory
4839 // that was not previously executable.
4840 //
4841 // Instead, stick the executable region in anonymous memory. Yuck.
4842 // Penalty is that ~4 pages will not be shareable - in the future
4843 // we might consider DLLizing the shared archive with a proper PE
4844 // header so that mapping executable + sharing is possible.
4845
4846 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4847 PAGE_READWRITE);
4848 if (base == NULL) {
4849 if (PrintMiscellaneous && Verbose) {
4850 DWORD err = GetLastError();
4851 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4852 }
4853 CloseHandle(hFile);
4854 return NULL;
4855 }
4856
4857 DWORD bytes_read;
4858 OVERLAPPED overlapped;
4859 overlapped.Offset = (DWORD)file_offset;
4860 overlapped.OffsetHigh = 0;
4861 overlapped.hEvent = NULL;
4862 // ReadFile guarantees that if the return value is true, the requested
4863 // number of bytes were read before returning.
4864 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4865 if (!res) {
4866 if (PrintMiscellaneous && Verbose) {
4867 DWORD err = GetLastError();
4868 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4869 }
4870 release_memory(base, bytes);
4871 CloseHandle(hFile);
4872 return NULL;
4873 }
4874 } else {
4875 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4876 NULL /* file_name */);
4877 if (hMap == NULL) {
4878 if (PrintMiscellaneous && Verbose) {
4879 DWORD err = GetLastError();
4880 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4881 }
4882 CloseHandle(hFile);
4883 return NULL;
4884 }
4885
4886 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4887 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4888 (DWORD)bytes, addr);
4889 if (base == NULL) {
4890 if (PrintMiscellaneous && Verbose) {
4891 DWORD err = GetLastError();
4892 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4893 }
4894 CloseHandle(hMap);
4895 CloseHandle(hFile);
4896 return NULL;
4897 }
4898
4899 if (CloseHandle(hMap) == 0) {
4900 if (PrintMiscellaneous && Verbose) {
4901 DWORD err = GetLastError();
4902 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4903 }
4904 CloseHandle(hFile);
4905 return base;
4906 }
4907 }
4908
4909 if (allow_exec) {
4910 DWORD old_protect;
4911 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4912 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4913
4914 if (!res) {
4915 if (PrintMiscellaneous && Verbose) {
4916 DWORD err = GetLastError();
4917 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4918 }
4919 // Don't consider this a hard error, on IA32 even if the
4920 // VirtualProtect fails, we should still be able to execute
4921 CloseHandle(hFile);
4922 return base;
4923 }
4924 }
4925
4926 if (CloseHandle(hFile) == 0) {
4927 if (PrintMiscellaneous && Verbose) {
4928 DWORD err = GetLastError();
4929 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4930 }
4931 return base;
4932 }
4933
4934 return base;
4935 }
4936
4937
4938 // Remap a block of memory.
4939 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4940 char *addr, size_t bytes, bool read_only,
4941 bool allow_exec) {
4942 // This OS does not allow existing memory maps to be remapped so we
4943 // have to unmap the memory before we remap it.
4944 if (!os::unmap_memory(addr, bytes)) {
4945 return NULL;
4946 }
4947
4948 // There is a very small theoretical window between the unmap_memory()
4949 // call above and the map_memory() call below where a thread in native
4950 // code may be able to access an address that is no longer mapped.
4951
4952 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4953 read_only, allow_exec);
4954 }
4955
4956
4957 // Unmap a block of memory.
4958 // Returns true=success, otherwise false.
4959
4960 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4961 MEMORY_BASIC_INFORMATION mem_info;
4962 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4963 if (PrintMiscellaneous && Verbose) {
4964 DWORD err = GetLastError();
4965 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4966 }
4967 return false;
4968 }
4969
4970 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4971 // Instead, executable region was allocated using VirtualAlloc(). See
4972 // pd_map_memory() above.
4973 //
4974 // The following flags should match the 'exec_access' flages used for
4975 // VirtualProtect() in pd_map_memory().
4976 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4977 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4978 return pd_release_memory(addr, bytes);
4979 }
4980
4981 BOOL result = UnmapViewOfFile(addr);
4982 if (result == 0) {
4983 if (PrintMiscellaneous && Verbose) {
4984 DWORD err = GetLastError();
4985 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4986 }
4987 return false;
4988 }
4989 return true;
4990 }
4991
4992 void os::pause() {
4993 char filename[MAX_PATH];
4994 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4995 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4996 } else {
4997 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4998 }
4999
5000 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5001 if (fd != -1) {
5002 struct stat buf;
5003 ::close(fd);
5004 while (::stat(filename, &buf) == 0) {
5005 Sleep(100);
5006 }
5007 } else {
5008 jio_fprintf(stderr,
5009 "Could not open pause file '%s', continuing immediately.\n", filename);
5010 }
5011 }
5012
5013 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
5014 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
5015 }
5016
5017 // See the caveats for this class in os_windows.hpp
5018 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5019 // into this method and returns false. If no OS EXCEPTION was raised, returns
5020 // true.
5021 // The callback is supposed to provide the method that should be protected.
5022 //
5023 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5024 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
5025 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
5026 "crash_protection already set?");
5027
5028 bool success = true;
5029 __try {
5030 WatcherThread::watcher_thread()->set_crash_protection(this);
5031 cb.call();
5032 } __except(EXCEPTION_EXECUTE_HANDLER) {
5033 // only for protection, nothing to do
5034 success = false;
5035 }
5036 WatcherThread::watcher_thread()->set_crash_protection(NULL);
5037 return success;
5038 }
5039
5040 // An Event wraps a win32 "CreateEvent" kernel handle.
5041 //
5042 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5043 //
5044 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5045 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5046 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5047 // In addition, an unpark() operation might fetch the handle field, but the
5048 // event could recycle between the fetch and the SetEvent() operation.
5049 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5050 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5051 // on an stale but recycled handle would be harmless, but in practice this might
5052 // confuse other non-Sun code, so it's not a viable approach.
5053 //
5054 // 2: Once a win32 event handle is associated with an Event, it remains associated
5055 // with the Event. The event handle is never closed. This could be construed
5056 // as handle leakage, but only up to the maximum # of threads that have been extant
5057 // at any one time. This shouldn't be an issue, as windows platforms typically
5058 // permit a process to have hundreds of thousands of open handles.
5059 //
5060 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5061 // and release unused handles.
5062 //
5063 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5064 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5065 //
5066 // 5. Use an RCU-like mechanism (Read-Copy Update).
5067 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5068 //
5069 // We use (2).
5070 //
5071 // TODO-FIXME:
5072 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5073 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5074 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5075 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5076 // into a single win32 CreateEvent() handle.
5077 //
5078 // Assumption:
5079 // Only one parker can exist on an event, which is why we allocate
5080 // them per-thread. Multiple unparkers can coexist.
5081 //
5082 // _Event transitions in park()
5083 // -1 => -1 : illegal
5084 // 1 => 0 : pass - return immediately
5085 // 0 => -1 : block; then set _Event to 0 before returning
5086 //
5087 // _Event transitions in unpark()
5088 // 0 => 1 : just return
5089 // 1 => 1 : just return
5090 // -1 => either 0 or 1; must signal target thread
5091 // That is, we can safely transition _Event from -1 to either
5092 // 0 or 1.
5093 //
5094 // _Event serves as a restricted-range semaphore.
5095 // -1 : thread is blocked, i.e. there is a waiter
5096 // 0 : neutral: thread is running or ready,
5097 // could have been signaled after a wait started
5098 // 1 : signaled - thread is running or ready
5099 //
5100 // Another possible encoding of _Event would be with
5101 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5102 //
5103
5104 int os::PlatformEvent::park(jlong Millis) {
5105 // Transitions for _Event:
5106 // -1 => -1 : illegal
5107 // 1 => 0 : pass - return immediately
5108 // 0 => -1 : block; then set _Event to 0 before returning
5109
5110 guarantee(_ParkHandle != NULL , "Invariant");
5111 guarantee(Millis > 0 , "Invariant");
5112
5113 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5114 // the initial park() operation.
5115 // Consider: use atomic decrement instead of CAS-loop
5116
5117 int v;
5118 for (;;) {
5119 v = _Event;
5120 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5121 }
5122 guarantee((v == 0) || (v == 1), "invariant");
5123 if (v != 0) return OS_OK;
5124
5125 // Do this the hard way by blocking ...
5126 // TODO: consider a brief spin here, gated on the success of recent
5127 // spin attempts by this thread.
5128 //
5129 // We decompose long timeouts into series of shorter timed waits.
5130 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5131 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5132 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5133 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5134 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5135 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5136 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5137 // for the already waited time. This policy does not admit any new outcomes.
5138 // In the future, however, we might want to track the accumulated wait time and
5139 // adjust Millis accordingly if we encounter a spurious wakeup.
5140
5141 const int MAXTIMEOUT = 0x10000000;
5142 DWORD rv = WAIT_TIMEOUT;
5143 while (_Event < 0 && Millis > 0) {
5144 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5145 if (Millis > MAXTIMEOUT) {
5146 prd = MAXTIMEOUT;
5147 }
5148 rv = ::WaitForSingleObject(_ParkHandle, prd);
5149 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5150 if (rv == WAIT_TIMEOUT) {
5151 Millis -= prd;
5152 }
5153 }
5154 v = _Event;
5155 _Event = 0;
5156 // see comment at end of os::PlatformEvent::park() below:
5157 OrderAccess::fence();
5158 // If we encounter a nearly simultanous timeout expiry and unpark()
5159 // we return OS_OK indicating we awoke via unpark().
5160 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5161 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5162 }
5163
5164 void os::PlatformEvent::park() {
5165 // Transitions for _Event:
5166 // -1 => -1 : illegal
5167 // 1 => 0 : pass - return immediately
5168 // 0 => -1 : block; then set _Event to 0 before returning
5169
5170 guarantee(_ParkHandle != NULL, "Invariant");
5171 // Invariant: Only the thread associated with the Event/PlatformEvent
5172 // may call park().
5173 // Consider: use atomic decrement instead of CAS-loop
5174 int v;
5175 for (;;) {
5176 v = _Event;
5177 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5178 }
5179 guarantee((v == 0) || (v == 1), "invariant");
5180 if (v != 0) return;
5181
5182 // Do this the hard way by blocking ...
5183 // TODO: consider a brief spin here, gated on the success of recent
5184 // spin attempts by this thread.
5185 while (_Event < 0) {
5186 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5187 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5188 }
5189
5190 // Usually we'll find _Event == 0 at this point, but as
5191 // an optional optimization we clear it, just in case can
5192 // multiple unpark() operations drove _Event up to 1.
5193 _Event = 0;
5194 OrderAccess::fence();
5195 guarantee(_Event >= 0, "invariant");
5196 }
5197
5198 void os::PlatformEvent::unpark() {
5199 guarantee(_ParkHandle != NULL, "Invariant");
5200
5201 // Transitions for _Event:
5202 // 0 => 1 : just return
5203 // 1 => 1 : just return
5204 // -1 => either 0 or 1; must signal target thread
5205 // That is, we can safely transition _Event from -1 to either
5206 // 0 or 1.
5207 // See also: "Semaphores in Plan 9" by Mullender & Cox
5208 //
5209 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5210 // that it will take two back-to-back park() calls for the owning
5211 // thread to block. This has the benefit of forcing a spurious return
5212 // from the first park() call after an unpark() call which will help
5213 // shake out uses of park() and unpark() without condition variables.
5214
5215 if (Atomic::xchg(1, &_Event) >= 0) return;
5216
5217 ::SetEvent(_ParkHandle);
5218 }
5219
5220
5221 // JSR166
5222 // -------------------------------------------------------
5223
5224 // The Windows implementation of Park is very straightforward: Basic
5225 // operations on Win32 Events turn out to have the right semantics to
5226 // use them directly. We opportunistically resuse the event inherited
5227 // from Monitor.
5228
5229 void Parker::park(bool isAbsolute, jlong time) {
5230 guarantee(_ParkEvent != NULL, "invariant");
5231 // First, demultiplex/decode time arguments
5232 if (time < 0) { // don't wait
5233 return;
5234 } else if (time == 0 && !isAbsolute) {
5235 time = INFINITE;
5236 } else if (isAbsolute) {
5237 time -= os::javaTimeMillis(); // convert to relative time
5238 if (time <= 0) { // already elapsed
5239 return;
5240 }
5241 } else { // relative
5242 time /= 1000000; // Must coarsen from nanos to millis
5243 if (time == 0) { // Wait for the minimal time unit if zero
5244 time = 1;
5245 }
5246 }
5247
5248 JavaThread* thread = JavaThread::current();
5249
5250 // Don't wait if interrupted or already triggered
5251 if (Thread::is_interrupted(thread, false) ||
5252 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5253 ResetEvent(_ParkEvent);
5254 return;
5255 } else {
5256 ThreadBlockInVM tbivm(thread);
5257 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5258 thread->set_suspend_equivalent();
5259
5260 WaitForSingleObject(_ParkEvent, time);
5261 ResetEvent(_ParkEvent);
5262
5263 // If externally suspended while waiting, re-suspend
5264 if (thread->handle_special_suspend_equivalent_condition()) {
5265 thread->java_suspend_self();
5266 }
5267 }
5268 }
5269
5270 void Parker::unpark() {
5271 guarantee(_ParkEvent != NULL, "invariant");
5272 SetEvent(_ParkEvent);
5273 }
5274
5275 // Run the specified command in a separate process. Return its exit value,
5276 // or -1 on failure (e.g. can't create a new process).
5277 int os::fork_and_exec(char* cmd) {
5278 STARTUPINFO si;
5279 PROCESS_INFORMATION pi;
5280
5281 memset(&si, 0, sizeof(si));
5282 si.cb = sizeof(si);
5283 memset(&pi, 0, sizeof(pi));
5284 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5285 cmd, // command line
5286 NULL, // process security attribute
5287 NULL, // thread security attribute
5288 TRUE, // inherits system handles
5289 0, // no creation flags
5290 NULL, // use parent's environment block
5291 NULL, // use parent's starting directory
5292 &si, // (in) startup information
5293 &pi); // (out) process information
5294
5295 if (rslt) {
5296 // Wait until child process exits.
5297 WaitForSingleObject(pi.hProcess, INFINITE);
5298
5299 DWORD exit_code;
5300 GetExitCodeProcess(pi.hProcess, &exit_code);
5301
5302 // Close process and thread handles.
5303 CloseHandle(pi.hProcess);
5304 CloseHandle(pi.hThread);
5305
5306 return (int)exit_code;
5307 } else {
5308 return -1;
5309 }
5310 }
5311
5312 //--------------------------------------------------------------------------------------------------
5313 // Non-product code
5314
5315 static int mallocDebugIntervalCounter = 0;
5316 static int mallocDebugCounter = 0;
5317 bool os::check_heap(bool force) {
5318 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5319 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5320 // Note: HeapValidate executes two hardware breakpoints when it finds something
5321 // wrong; at these points, eax contains the address of the offending block (I think).
5322 // To get to the exlicit error message(s) below, just continue twice.
5323 //
5324 // Note: we want to check the CRT heap, which is not necessarily located in the
5325 // process default heap.
5326 HANDLE heap = (HANDLE) _get_heap_handle();
5327 if (!heap) {
5328 return true;
5329 }
5330
5331 // If we fail to lock the heap, then gflags.exe has been used
5332 // or some other special heap flag has been set that prevents
5333 // locking. We don't try to walk a heap we can't lock.
5334 if (HeapLock(heap) != 0) {
5335 PROCESS_HEAP_ENTRY phe;
5336 phe.lpData = NULL;
5337 while (HeapWalk(heap, &phe) != 0) {
5338 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5339 !HeapValidate(heap, 0, phe.lpData)) {
5340 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5341 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5342 HeapUnlock(heap);
5343 fatal("corrupted C heap");
5344 }
5345 }
5346 DWORD err = GetLastError();
5347 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5348 HeapUnlock(heap);
5349 fatal("heap walk aborted with error %d", err);
5350 }
5351 HeapUnlock(heap);
5352 }
5353 mallocDebugIntervalCounter = 0;
5354 }
5355 return true;
5356 }
5357
5358
5359 bool os::find(address addr, outputStream* st) {
5360 // Nothing yet
5361 return false;
5362 }
5363
5364 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5365 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5366
5367 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5368 JavaThread* thread = JavaThread::current();
5369 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5370 address addr = (address) exceptionRecord->ExceptionInformation[1];
5371
5372 if (os::is_memory_serialize_page(thread, addr)) {
5373 return EXCEPTION_CONTINUE_EXECUTION;
5374 }
5375 }
5376
5377 return EXCEPTION_CONTINUE_SEARCH;
5378 }
5379
5380 // We don't build a headless jre for Windows
5381 bool os::is_headless_jre() { return false; }
5382
5383 static jint initSock() {
5384 WSADATA wsadata;
5385
5386 if (!os::WinSock2Dll::WinSock2Available()) {
5387 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5388 ::GetLastError());
5389 return JNI_ERR;
5390 }
5391
5392 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5393 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5394 ::GetLastError());
5395 return JNI_ERR;
5396 }
5397 return JNI_OK;
5398 }
5399
5400 struct hostent* os::get_host_by_name(char* name) {
5401 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5402 }
5403
5404 int os::socket_close(int fd) {
5405 return ::closesocket(fd);
5406 }
5407
5408 int os::socket(int domain, int type, int protocol) {
5409 return ::socket(domain, type, protocol);
5410 }
5411
5412 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5413 return ::connect(fd, him, len);
5414 }
5415
5416 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5417 return ::recv(fd, buf, (int)nBytes, flags);
5418 }
5419
5420 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5421 return ::send(fd, buf, (int)nBytes, flags);
5422 }
5423
5424 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5425 return ::send(fd, buf, (int)nBytes, flags);
5426 }
5427
5428 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5429 #if defined(IA32)
5430 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5431 #elif defined (AMD64)
5432 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5433 #endif
5434
5435 // returns true if thread could be suspended,
5436 // false otherwise
5437 static bool do_suspend(HANDLE* h) {
5438 if (h != NULL) {
5439 if (SuspendThread(*h) != ~0) {
5440 return true;
5441 }
5442 }
5443 return false;
5444 }
5445
5446 // resume the thread
5447 // calling resume on an active thread is a no-op
5448 static void do_resume(HANDLE* h) {
5449 if (h != NULL) {
5450 ResumeThread(*h);
5451 }
5452 }
5453
5454 // retrieve a suspend/resume context capable handle
5455 // from the tid. Caller validates handle return value.
5456 void get_thread_handle_for_extended_context(HANDLE* h,
5457 OSThread::thread_id_t tid) {
5458 if (h != NULL) {
5459 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5460 }
5461 }
5462
5463 // Thread sampling implementation
5464 //
5465 void os::SuspendedThreadTask::internal_do_task() {
5466 CONTEXT ctxt;
5467 HANDLE h = NULL;
5468
5469 // get context capable handle for thread
5470 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5471
5472 // sanity
5473 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5474 return;
5475 }
5476
5477 // suspend the thread
5478 if (do_suspend(&h)) {
5479 ctxt.ContextFlags = sampling_context_flags;
5480 // get thread context
5481 GetThreadContext(h, &ctxt);
5482 SuspendedThreadTaskContext context(_thread, &ctxt);
5483 // pass context to Thread Sampling impl
5484 do_task(context);
5485 // resume thread
5486 do_resume(&h);
5487 }
5488
5489 // close handle
5490 CloseHandle(h);
5491 }
5492
5493
5494 // Kernel32 API
5495 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5496 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5497 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5498 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5499 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5500
5501 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5502 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5503 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5504 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5505 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5506
5507
5508 BOOL os::Kernel32Dll::initialized = FALSE;
5509 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5510 assert(initialized && _GetLargePageMinimum != NULL,
5511 "GetLargePageMinimumAvailable() not yet called");
5512 return _GetLargePageMinimum();
5513 }
5514
5515 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5516 if (!initialized) {
5517 initialize();
5518 }
5519 return _GetLargePageMinimum != NULL;
5520 }
5521
5522 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5523 if (!initialized) {
5524 initialize();
5525 }
5526 return _VirtualAllocExNuma != NULL;
5527 }
5528
5529 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5530 SIZE_T bytes, DWORD flags,
5531 DWORD prot, DWORD node) {
5532 assert(initialized && _VirtualAllocExNuma != NULL,
5533 "NUMACallsAvailable() not yet called");
5534
5535 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5536 }
5537
5538 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5539 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5540 "NUMACallsAvailable() not yet called");
5541
5542 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5543 }
5544
5545 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5546 PULONGLONG proc_mask) {
5547 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5548 "NUMACallsAvailable() not yet called");
5549
5550 return _GetNumaNodeProcessorMask(node, proc_mask);
5551 }
5552
5553 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5554 ULONG FrameToCapture,
5555 PVOID* BackTrace,
5556 PULONG BackTraceHash) {
5557 if (!initialized) {
5558 initialize();
5559 }
5560
5561 if (_RtlCaptureStackBackTrace != NULL) {
5562 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5563 BackTrace, BackTraceHash);
5564 } else {
5565 return 0;
5566 }
5567 }
5568
5569 void os::Kernel32Dll::initializeCommon() {
5570 if (!initialized) {
5571 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5572 assert(handle != NULL, "Just check");
5573 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5574 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5575 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5576 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5577 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5578 initialized = TRUE;
5579 }
5580 }
5581
5582 bool os::start_debugging(char *buf, int buflen) {
5583 int len = (int)strlen(buf);
5584 char *p = &buf[len];
5585
5586 jio_snprintf(p, buflen-len,
5587 "\n\n"
5588 "Do you want to debug the problem?\n\n"
5589 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5590 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5591 "Otherwise, select 'No' to abort...",
5592 os::current_process_id(), os::current_thread_id());
5593
5594 bool yes = os::message_box("Unexpected Error", buf);
5595
5596 if (yes) {
5597 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5598 // exception. If VM is running inside a debugger, the debugger will
5599 // catch the exception. Otherwise, the breakpoint exception will reach
5600 // the default windows exception handler, which can spawn a debugger and
5601 // automatically attach to the dying VM.
5602 os::breakpoint();
5603 yes = false;
5604 }
5605 return yes;
5606 }
5607
5608 void os::Kernel32Dll::initialize() {
5609 initializeCommon();
5610 }
5611
5612
5613 // Kernel32 API
5614 inline BOOL os::Kernel32Dll::SwitchToThread() {
5615 return ::SwitchToThread();
5616 }
5617
5618 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5619 return true;
5620 }
5621
5622 // Help tools
5623 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5624 return true;
5625 }
5626
5627 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5628 DWORD th32ProcessId) {
5629 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5630 }
5631
5632 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5633 LPMODULEENTRY32 lpme) {
5634 return ::Module32First(hSnapshot, lpme);
5635 }
5636
5637 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5638 LPMODULEENTRY32 lpme) {
5639 return ::Module32Next(hSnapshot, lpme);
5640 }
5641
5642 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5643 ::GetNativeSystemInfo(lpSystemInfo);
5644 }
5645
5646 // PSAPI API
5647 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5648 HMODULE *lpModule, DWORD cb,
5649 LPDWORD lpcbNeeded) {
5650 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5651 }
5652
5653 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5654 HMODULE hModule,
5655 LPTSTR lpFilename,
5656 DWORD nSize) {
5657 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5658 }
5659
5660 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5661 HMODULE hModule,
5662 LPMODULEINFO lpmodinfo,
5663 DWORD cb) {
5664 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5665 }
5666
5667 inline BOOL os::PSApiDll::PSApiAvailable() {
5668 return true;
5669 }
5670
5671
5672 // WinSock2 API
5673 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5674 LPWSADATA lpWSAData) {
5675 return ::WSAStartup(wVersionRequested, lpWSAData);
5676 }
5677
5678 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5679 return ::gethostbyname(name);
5680 }
5681
5682 inline BOOL os::WinSock2Dll::WinSock2Available() {
5683 return true;
5684 }
5685
5686 // Advapi API
5687 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5688 BOOL DisableAllPrivileges,
5689 PTOKEN_PRIVILEGES NewState,
5690 DWORD BufferLength,
5691 PTOKEN_PRIVILEGES PreviousState,
5692 PDWORD ReturnLength) {
5693 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5694 BufferLength, PreviousState, ReturnLength);
5695 }
5696
5697 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5698 DWORD DesiredAccess,
5699 PHANDLE TokenHandle) {
5700 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5701 }
5702
5703 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5704 LPCTSTR lpName,
5705 PLUID lpLuid) {
5706 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5707 }
5708
5709 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5710 return true;
5711 }
5712
5713 void* os::get_default_process_handle() {
5714 return (void*)GetModuleHandle(NULL);
5715 }
5716
5717 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5718 // which is used to find statically linked in agents.
5719 // Additionally for windows, takes into account __stdcall names.
5720 // Parameters:
5721 // sym_name: Symbol in library we are looking for
5722 // lib_name: Name of library to look in, NULL for shared libs.
5723 // is_absolute_path == true if lib_name is absolute path to agent
5724 // such as "C:/a/b/L.dll"
5725 // == false if only the base name of the library is passed in
5726 // such as "L"
5727 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5728 bool is_absolute_path) {
5729 char *agent_entry_name;
5730 size_t len;
5731 size_t name_len;
5732 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5733 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5734 const char *start;
5735
5736 if (lib_name != NULL) {
5737 len = name_len = strlen(lib_name);
5738 if (is_absolute_path) {
5739 // Need to strip path, prefix and suffix
5740 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5741 lib_name = ++start;
5742 } else {
5743 // Need to check for drive prefix
5744 if ((start = strchr(lib_name, ':')) != NULL) {
5745 lib_name = ++start;
5746 }
5747 }
5748 if (len <= (prefix_len + suffix_len)) {
5749 return NULL;
5750 }
5751 lib_name += prefix_len;
5752 name_len = strlen(lib_name) - suffix_len;
5753 }
5754 }
5755 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5756 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5757 if (agent_entry_name == NULL) {
5758 return NULL;
5759 }
5760 if (lib_name != NULL) {
5761 const char *p = strrchr(sym_name, '@');
5762 if (p != NULL && p != sym_name) {
5763 // sym_name == _Agent_OnLoad@XX
5764 strncpy(agent_entry_name, sym_name, (p - sym_name));
5765 agent_entry_name[(p-sym_name)] = '\0';
5766 // agent_entry_name == _Agent_OnLoad
5767 strcat(agent_entry_name, "_");
5768 strncat(agent_entry_name, lib_name, name_len);
5769 strcat(agent_entry_name, p);
5770 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5771 } else {
5772 strcpy(agent_entry_name, sym_name);
5773 strcat(agent_entry_name, "_");
5774 strncat(agent_entry_name, lib_name, name_len);
5775 }
5776 } else {
5777 strcpy(agent_entry_name, sym_name);
5778 }
5779 return agent_entry_name;
5780 }
5781
5782 #ifndef PRODUCT
5783
5784 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5785 // contiguous memory block at a particular address.
5786 // The test first tries to find a good approximate address to allocate at by using the same
5787 // method to allocate some memory at any address. The test then tries to allocate memory in
5788 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5789 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5790 // the previously allocated memory is available for allocation. The only actual failure
5791 // that is reported is when the test tries to allocate at a particular location but gets a
5792 // different valid one. A NULL return value at this point is not considered an error but may
5793 // be legitimate.
5794 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5795 void TestReserveMemorySpecial_test() {
5796 if (!UseLargePages) {
5797 if (VerboseInternalVMTests) {
5798 tty->print("Skipping test because large pages are disabled");
5799 }
5800 return;
5801 }
5802 // save current value of globals
5803 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5804 bool old_use_numa_interleaving = UseNUMAInterleaving;
5805
5806 // set globals to make sure we hit the correct code path
5807 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5808
5809 // do an allocation at an address selected by the OS to get a good one.
5810 const size_t large_allocation_size = os::large_page_size() * 4;
5811 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5812 if (result == NULL) {
5813 if (VerboseInternalVMTests) {
5814 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5815 large_allocation_size);
5816 }
5817 } else {
5818 os::release_memory_special(result, large_allocation_size);
5819
5820 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5821 // we managed to get it once.
5822 const size_t expected_allocation_size = os::large_page_size();
5823 char* expected_location = result + os::large_page_size();
5824 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5825 if (actual_location == NULL) {
5826 if (VerboseInternalVMTests) {
5827 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5828 expected_location, large_allocation_size);
5829 }
5830 } else {
5831 // release memory
5832 os::release_memory_special(actual_location, expected_allocation_size);
5833 // only now check, after releasing any memory to avoid any leaks.
5834 assert(actual_location == expected_location,
5835 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5836 expected_location, expected_allocation_size, actual_location);
5837 }
5838 }
5839
5840 // restore globals
5841 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5842 UseNUMAInterleaving = old_use_numa_interleaving;
5843 }
5844 #endif // PRODUCT
5845
5846 /*
5847 All the defined signal names for Windows.
5848
5849 NOTE that not all of these names are accepted by FindSignal!
5850
5851 For various reasons some of these may be rejected at runtime.
5852
5853 Here are the names currently accepted by a user of sun.misc.Signal with
5854 1.4.1 (ignoring potential interaction with use of chaining, etc):
5855
5856 (LIST TBD)
5857
5858 */
5859 int os::get_signal_number(const char* name) {
5860 static const struct {
5861 char* name;
5862 int number;
5863 } siglabels [] =
5864 // derived from version 6.0 VC98/include/signal.h
5865 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5866 "FPE", SIGFPE, // floating point exception
5867 "SEGV", SIGSEGV, // segment violation
5868 "INT", SIGINT, // interrupt
5869 "TERM", SIGTERM, // software term signal from kill
5870 "BREAK", SIGBREAK, // Ctrl-Break sequence
5871 "ILL", SIGILL}; // illegal instruction
5872 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
5873 if(!strcmp(name, siglabels[i].name))
5874 return siglabels[i].number;
5875 return -1;
5876 }
5877
5878 // Fast current thread access
5879
5880 int os::win32::_thread_ptr_offset = 0;
5881
5882 static void call_wrapper_dummy() {}
5883
5884 // We need to call the os_exception_wrapper once so that it sets
5885 // up the offset from FS of the thread pointer.
5886 void os::win32::initialize_thread_ptr_offset() {
5887 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5888 NULL, NULL, NULL, NULL);
5889 }