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