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 precision,
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, void *siginfo) {
1802 EXCEPTION_RECORD* 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
1823 if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && UseSharedSpaces) {
1824 FileMapInfo* mapinfo = FileMapInfo::current_info();
1825 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1826 st->print("\n\nError accessing class data sharing archive." \
1827 " Mapped file inaccessible during execution, " \
1828 " possible disk/network problem.");
1829 }
1830 }
1831 } else {
1832 int num = er->NumberParameters;
1833 if (num > 0) {
1834 st->print(", ExceptionInformation=");
1835 for (int i = 0; i < num; i++) {
1836 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1837 }
1838 }
1839 }
1840 st->cr();
1841 }
1842
1843 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1844 // do nothing
1845 }
1846
1847 static char saved_jvm_path[MAX_PATH] = {0};
1848
1849 // Find the full path to the current module, jvm.dll
1850 void os::jvm_path(char *buf, jint buflen) {
1851 // Error checking.
1852 if (buflen < MAX_PATH) {
1853 assert(false, "must use a large-enough buffer");
1854 buf[0] = '\0';
1855 return;
1856 }
1857 // Lazy resolve the path to current module.
1858 if (saved_jvm_path[0] != 0) {
1859 strcpy(buf, saved_jvm_path);
1860 return;
1861 }
1862
1863 buf[0] = '\0';
1864 if (Arguments::sun_java_launcher_is_altjvm()) {
1865 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1866 // for a JAVA_HOME environment variable and fix up the path so it
1867 // looks like jvm.dll is installed there (append a fake suffix
1868 // hotspot/jvm.dll).
1869 char* java_home_var = ::getenv("JAVA_HOME");
1870 if (java_home_var != NULL && java_home_var[0] != 0 &&
1871 strlen(java_home_var) < (size_t)buflen) {
1872 strncpy(buf, java_home_var, buflen);
1873
1874 // determine if this is a legacy image or modules image
1875 // modules image doesn't have "jre" subdirectory
1876 size_t len = strlen(buf);
1877 char* jrebin_p = buf + len;
1878 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1879 if (0 != _access(buf, 0)) {
1880 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1881 }
1882 len = strlen(buf);
1883 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1884 }
1885 }
1886
1887 if (buf[0] == '\0') {
1888 GetModuleFileName(vm_lib_handle, buf, buflen);
1889 }
1890 strncpy(saved_jvm_path, buf, MAX_PATH);
1891 saved_jvm_path[MAX_PATH - 1] = '\0';
1892 }
1893
1894
1895 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1896 #ifndef _WIN64
1897 st->print("_");
1898 #endif
1899 }
1900
1901
1902 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1903 #ifndef _WIN64
1904 st->print("@%d", args_size * sizeof(int));
1905 #endif
1906 }
1907
1908 // This method is a copy of JDK's sysGetLastErrorString
1909 // from src/windows/hpi/src/system_md.c
1910
1911 size_t os::lasterror(char* buf, size_t len) {
1912 DWORD errval;
1913
1914 if ((errval = GetLastError()) != 0) {
1915 // DOS error
1916 size_t n = (size_t)FormatMessage(
1917 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1918 NULL,
1919 errval,
1920 0,
1921 buf,
1922 (DWORD)len,
1923 NULL);
1924 if (n > 3) {
1925 // Drop final '.', CR, LF
1926 if (buf[n - 1] == '\n') n--;
1927 if (buf[n - 1] == '\r') n--;
1928 if (buf[n - 1] == '.') n--;
1929 buf[n] = '\0';
1930 }
1931 return n;
1932 }
1933
1934 if (errno != 0) {
1935 // C runtime error that has no corresponding DOS error code
1936 const char* s = strerror(errno);
1937 size_t n = strlen(s);
1938 if (n >= len) n = len - 1;
1939 strncpy(buf, s, n);
1940 buf[n] = '\0';
1941 return n;
1942 }
1943
1944 return 0;
1945 }
1946
1947 int os::get_last_error() {
1948 DWORD error = GetLastError();
1949 if (error == 0) {
1950 error = errno;
1951 }
1952 return (int)error;
1953 }
1954
1955 WindowsSemaphore::WindowsSemaphore(uint value) {
1956 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1957
1958 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1959 }
1960
1961 WindowsSemaphore::~WindowsSemaphore() {
1962 ::CloseHandle(_semaphore);
1963 }
1964
1965 void WindowsSemaphore::signal(uint count) {
1966 if (count > 0) {
1967 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1968
1969 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1970 }
1971 }
1972
1973 void WindowsSemaphore::wait() {
1974 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1975 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1976 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1977 }
1978
1979 // sun.misc.Signal
1980 // NOTE that this is a workaround for an apparent kernel bug where if
1981 // a signal handler for SIGBREAK is installed then that signal handler
1982 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1983 // See bug 4416763.
1984 static void (*sigbreakHandler)(int) = NULL;
1985
1986 static void UserHandler(int sig, void *siginfo, void *context) {
1987 os::signal_notify(sig);
1988 // We need to reinstate the signal handler each time...
1989 os::signal(sig, (void*)UserHandler);
1990 }
1991
1992 void* os::user_handler() {
1993 return (void*) UserHandler;
1994 }
1995
1996 void* os::signal(int signal_number, void* handler) {
1997 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1998 void (*oldHandler)(int) = sigbreakHandler;
1999 sigbreakHandler = (void (*)(int)) handler;
2000 return (void*) oldHandler;
2001 } else {
2002 return (void*)::signal(signal_number, (void (*)(int))handler);
2003 }
2004 }
2005
2006 void os::signal_raise(int signal_number) {
2007 raise(signal_number);
2008 }
2009
2010 // The Win32 C runtime library maps all console control events other than ^C
2011 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2012 // logoff, and shutdown events. We therefore install our own console handler
2013 // that raises SIGTERM for the latter cases.
2014 //
2015 static BOOL WINAPI consoleHandler(DWORD event) {
2016 switch (event) {
2017 case CTRL_C_EVENT:
2018 if (is_error_reported()) {
2019 // Ctrl-C is pressed during error reporting, likely because the error
2020 // handler fails to abort. Let VM die immediately.
2021 os::die();
2022 }
2023
2024 os::signal_raise(SIGINT);
2025 return TRUE;
2026 break;
2027 case CTRL_BREAK_EVENT:
2028 if (sigbreakHandler != NULL) {
2029 (*sigbreakHandler)(SIGBREAK);
2030 }
2031 return TRUE;
2032 break;
2033 case CTRL_LOGOFF_EVENT: {
2034 // Don't terminate JVM if it is running in a non-interactive session,
2035 // such as a service process.
2036 USEROBJECTFLAGS flags;
2037 HANDLE handle = GetProcessWindowStation();
2038 if (handle != NULL &&
2039 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2040 sizeof(USEROBJECTFLAGS), NULL)) {
2041 // If it is a non-interactive session, let next handler to deal
2042 // with it.
2043 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2044 return FALSE;
2045 }
2046 }
2047 }
2048 case CTRL_CLOSE_EVENT:
2049 case CTRL_SHUTDOWN_EVENT:
2050 os::signal_raise(SIGTERM);
2051 return TRUE;
2052 break;
2053 default:
2054 break;
2055 }
2056 return FALSE;
2057 }
2058
2059 // The following code is moved from os.cpp for making this
2060 // code platform specific, which it is by its very nature.
2061
2062 // Return maximum OS signal used + 1 for internal use only
2063 // Used as exit signal for signal_thread
2064 int os::sigexitnum_pd() {
2065 return NSIG;
2066 }
2067
2068 // a counter for each possible signal value, including signal_thread exit signal
2069 static volatile jint pending_signals[NSIG+1] = { 0 };
2070 static HANDLE sig_sem = NULL;
2071
2072 void os::signal_init_pd() {
2073 // Initialize signal structures
2074 memset((void*)pending_signals, 0, sizeof(pending_signals));
2075
2076 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2077
2078 // Programs embedding the VM do not want it to attempt to receive
2079 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2080 // shutdown hooks mechanism introduced in 1.3. For example, when
2081 // the VM is run as part of a Windows NT service (i.e., a servlet
2082 // engine in a web server), the correct behavior is for any console
2083 // control handler to return FALSE, not TRUE, because the OS's
2084 // "final" handler for such events allows the process to continue if
2085 // it is a service (while terminating it if it is not a service).
2086 // To make this behavior uniform and the mechanism simpler, we
2087 // completely disable the VM's usage of these console events if -Xrs
2088 // (=ReduceSignalUsage) is specified. This means, for example, that
2089 // the CTRL-BREAK thread dump mechanism is also disabled in this
2090 // case. See bugs 4323062, 4345157, and related bugs.
2091
2092 if (!ReduceSignalUsage) {
2093 // Add a CTRL-C handler
2094 SetConsoleCtrlHandler(consoleHandler, TRUE);
2095 }
2096 }
2097
2098 void os::signal_notify(int signal_number) {
2099 BOOL ret;
2100 if (sig_sem != NULL) {
2101 Atomic::inc(&pending_signals[signal_number]);
2102 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2103 assert(ret != 0, "ReleaseSemaphore() failed");
2104 }
2105 }
2106
2107 static int check_pending_signals(bool wait_for_signal) {
2108 DWORD ret;
2109 while (true) {
2110 for (int i = 0; i < NSIG + 1; i++) {
2111 jint n = pending_signals[i];
2112 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2113 return i;
2114 }
2115 }
2116 if (!wait_for_signal) {
2117 return -1;
2118 }
2119
2120 JavaThread *thread = JavaThread::current();
2121
2122 ThreadBlockInVM tbivm(thread);
2123
2124 bool threadIsSuspended;
2125 do {
2126 thread->set_suspend_equivalent();
2127 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2128 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2129 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2130
2131 // were we externally suspended while we were waiting?
2132 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2133 if (threadIsSuspended) {
2134 // The semaphore has been incremented, but while we were waiting
2135 // another thread suspended us. We don't want to continue running
2136 // while suspended because that would surprise the thread that
2137 // suspended us.
2138 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2139 assert(ret != 0, "ReleaseSemaphore() failed");
2140
2141 thread->java_suspend_self();
2142 }
2143 } while (threadIsSuspended);
2144 }
2145 }
2146
2147 int os::signal_lookup() {
2148 return check_pending_signals(false);
2149 }
2150
2151 int os::signal_wait() {
2152 return check_pending_signals(true);
2153 }
2154
2155 // Implicit OS exception handling
2156
2157 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2158 address handler) {
2159 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2160 // Save pc in thread
2161 #ifdef _M_IA64
2162 // Do not blow up if no thread info available.
2163 if (thread) {
2164 // Saving PRECISE pc (with slot information) in thread.
2165 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2166 // Convert precise PC into "Unix" format
2167 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2168 thread->set_saved_exception_pc((address)precise_pc);
2169 }
2170 // Set pc to handler
2171 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2172 // Clear out psr.ri (= Restart Instruction) in order to continue
2173 // at the beginning of the target bundle.
2174 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2175 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2176 #else
2177 #ifdef _M_AMD64
2178 // Do not blow up if no thread info available.
2179 if (thread) {
2180 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2181 }
2182 // Set pc to handler
2183 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2184 #else
2185 // Do not blow up if no thread info available.
2186 if (thread) {
2187 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2188 }
2189 // Set pc to handler
2190 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2191 #endif
2192 #endif
2193
2194 // Continue the execution
2195 return EXCEPTION_CONTINUE_EXECUTION;
2196 }
2197
2198
2199 // Used for PostMortemDump
2200 extern "C" void safepoints();
2201 extern "C" void find(int x);
2202 extern "C" void events();
2203
2204 // According to Windows API documentation, an illegal instruction sequence should generate
2205 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2206 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2207 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2208
2209 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2210
2211 // From "Execution Protection in the Windows Operating System" draft 0.35
2212 // Once a system header becomes available, the "real" define should be
2213 // included or copied here.
2214 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2215
2216 // Handle NAT Bit consumption on IA64.
2217 #ifdef _M_IA64
2218 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2219 #endif
2220
2221 // Windows Vista/2008 heap corruption check
2222 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2223
2224 #define def_excpt(val) #val, val
2225
2226 struct siglabel {
2227 char *name;
2228 int number;
2229 };
2230
2231 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2232 // C++ compiler contain this error code. Because this is a compiler-generated
2233 // error, the code is not listed in the Win32 API header files.
2234 // The code is actually a cryptic mnemonic device, with the initial "E"
2235 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2236 // ASCII values of "msc".
2237
2238 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2239
2240
2241 struct siglabel exceptlabels[] = {
2242 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2243 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2244 def_excpt(EXCEPTION_BREAKPOINT),
2245 def_excpt(EXCEPTION_SINGLE_STEP),
2246 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2247 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2248 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2249 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2250 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2251 def_excpt(EXCEPTION_FLT_OVERFLOW),
2252 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2253 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2254 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2255 def_excpt(EXCEPTION_INT_OVERFLOW),
2256 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2257 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2258 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2259 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2260 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2261 def_excpt(EXCEPTION_STACK_OVERFLOW),
2262 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2263 def_excpt(EXCEPTION_GUARD_PAGE),
2264 def_excpt(EXCEPTION_INVALID_HANDLE),
2265 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2266 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2267 #ifdef _M_IA64
2268 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2269 #endif
2270 NULL, 0
2271 };
2272
2273 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2274 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2275 if (exceptlabels[i].number == exception_code) {
2276 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2277 return buf;
2278 }
2279 }
2280
2281 return NULL;
2282 }
2283
2284 //-----------------------------------------------------------------------------
2285 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2286 // handle exception caused by idiv; should only happen for -MinInt/-1
2287 // (division by zero is handled explicitly)
2288 #ifdef _M_IA64
2289 assert(0, "Fix Handle_IDiv_Exception");
2290 #else
2291 #ifdef _M_AMD64
2292 PCONTEXT ctx = exceptionInfo->ContextRecord;
2293 address pc = (address)ctx->Rip;
2294 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2295 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2296 if (pc[0] == 0xF7) {
2297 // set correct result values and continue after idiv instruction
2298 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2299 } else {
2300 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2301 }
2302 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2303 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2304 // idiv opcode (0xF7).
2305 ctx->Rdx = (DWORD)0; // remainder
2306 // Continue the execution
2307 #else
2308 PCONTEXT ctx = exceptionInfo->ContextRecord;
2309 address pc = (address)ctx->Eip;
2310 assert(pc[0] == 0xF7, "not an idiv opcode");
2311 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2312 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2313 // set correct result values and continue after idiv instruction
2314 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2315 ctx->Eax = (DWORD)min_jint; // result
2316 ctx->Edx = (DWORD)0; // remainder
2317 // Continue the execution
2318 #endif
2319 #endif
2320 return EXCEPTION_CONTINUE_EXECUTION;
2321 }
2322
2323 //-----------------------------------------------------------------------------
2324 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2325 PCONTEXT ctx = exceptionInfo->ContextRecord;
2326 #ifndef _WIN64
2327 // handle exception caused by native method modifying control word
2328 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2329
2330 switch (exception_code) {
2331 case EXCEPTION_FLT_DENORMAL_OPERAND:
2332 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2333 case EXCEPTION_FLT_INEXACT_RESULT:
2334 case EXCEPTION_FLT_INVALID_OPERATION:
2335 case EXCEPTION_FLT_OVERFLOW:
2336 case EXCEPTION_FLT_STACK_CHECK:
2337 case EXCEPTION_FLT_UNDERFLOW:
2338 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2339 if (fp_control_word != ctx->FloatSave.ControlWord) {
2340 // Restore FPCW and mask out FLT exceptions
2341 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2342 // Mask out pending FLT exceptions
2343 ctx->FloatSave.StatusWord &= 0xffffff00;
2344 return EXCEPTION_CONTINUE_EXECUTION;
2345 }
2346 }
2347
2348 if (prev_uef_handler != NULL) {
2349 // We didn't handle this exception so pass it to the previous
2350 // UnhandledExceptionFilter.
2351 return (prev_uef_handler)(exceptionInfo);
2352 }
2353 #else // !_WIN64
2354 // On Windows, the mxcsr control bits are non-volatile across calls
2355 // See also CR 6192333
2356 //
2357 jint MxCsr = INITIAL_MXCSR;
2358 // we can't use StubRoutines::addr_mxcsr_std()
2359 // because in Win64 mxcsr is not saved there
2360 if (MxCsr != ctx->MxCsr) {
2361 ctx->MxCsr = MxCsr;
2362 return EXCEPTION_CONTINUE_EXECUTION;
2363 }
2364 #endif // !_WIN64
2365
2366 return EXCEPTION_CONTINUE_SEARCH;
2367 }
2368
2369 static inline void report_error(Thread* t, DWORD exception_code,
2370 address addr, void* siginfo, void* context) {
2371 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2372
2373 // If UseOsErrorReporting, this will return here and save the error file
2374 // somewhere where we can find it in the minidump.
2375 }
2376
2377 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2378 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2379 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2380 address addr = (address) exceptionRecord->ExceptionInformation[1];
2381 if (Interpreter::contains(pc)) {
2382 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2383 if (!fr->is_first_java_frame()) {
2384 assert(fr->safe_for_sender(thread), "Safety check");
2385 *fr = fr->java_sender();
2386 }
2387 } else {
2388 // more complex code with compiled code
2389 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2390 CodeBlob* cb = CodeCache::find_blob(pc);
2391 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2392 // Not sure where the pc points to, fallback to default
2393 // stack overflow handling
2394 return false;
2395 } else {
2396 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2397 // in compiled code, the stack banging is performed just after the return pc
2398 // has been pushed on the stack
2399 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2400 if (!fr->is_java_frame()) {
2401 assert(fr->safe_for_sender(thread), "Safety check");
2402 *fr = fr->java_sender();
2403 }
2404 }
2405 }
2406 assert(fr->is_java_frame(), "Safety check");
2407 return true;
2408 }
2409
2410 //-----------------------------------------------------------------------------
2411 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2412 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2413 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2414 #ifdef _M_IA64
2415 // On Itanium, we need the "precise pc", which has the slot number coded
2416 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2417 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2418 // Convert the pc to "Unix format", which has the slot number coded
2419 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2420 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2421 // information is saved in the Unix format.
2422 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2423 #else
2424 #ifdef _M_AMD64
2425 address pc = (address) exceptionInfo->ContextRecord->Rip;
2426 #else
2427 address pc = (address) exceptionInfo->ContextRecord->Eip;
2428 #endif
2429 #endif
2430 Thread* t = Thread::current_or_null_safe();
2431
2432 // Handle SafeFetch32 and SafeFetchN exceptions.
2433 if (StubRoutines::is_safefetch_fault(pc)) {
2434 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2435 }
2436
2437 #ifndef _WIN64
2438 // Execution protection violation - win32 running on AMD64 only
2439 // Handled first to avoid misdiagnosis as a "normal" access violation;
2440 // This is safe to do because we have a new/unique ExceptionInformation
2441 // code for this condition.
2442 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2443 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2444 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2445 address addr = (address) exceptionRecord->ExceptionInformation[1];
2446
2447 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2448 int page_size = os::vm_page_size();
2449
2450 // Make sure the pc and the faulting address are sane.
2451 //
2452 // If an instruction spans a page boundary, and the page containing
2453 // the beginning of the instruction is executable but the following
2454 // page is not, the pc and the faulting address might be slightly
2455 // different - we still want to unguard the 2nd page in this case.
2456 //
2457 // 15 bytes seems to be a (very) safe value for max instruction size.
2458 bool pc_is_near_addr =
2459 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2460 bool instr_spans_page_boundary =
2461 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2462 (intptr_t) page_size) > 0);
2463
2464 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2465 static volatile address last_addr =
2466 (address) os::non_memory_address_word();
2467
2468 // In conservative mode, don't unguard unless the address is in the VM
2469 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2470 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2471
2472 // Set memory to RWX and retry
2473 address page_start =
2474 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2475 bool res = os::protect_memory((char*) page_start, page_size,
2476 os::MEM_PROT_RWX);
2477
2478 if (PrintMiscellaneous && Verbose) {
2479 char buf[256];
2480 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2481 "at " INTPTR_FORMAT
2482 ", unguarding " INTPTR_FORMAT ": %s", addr,
2483 page_start, (res ? "success" : strerror(errno)));
2484 tty->print_raw_cr(buf);
2485 }
2486
2487 // Set last_addr so if we fault again at the same address, we don't
2488 // end up in an endless loop.
2489 //
2490 // There are two potential complications here. Two threads trapping
2491 // at the same address at the same time could cause one of the
2492 // threads to think it already unguarded, and abort the VM. Likely
2493 // very rare.
2494 //
2495 // The other race involves two threads alternately trapping at
2496 // different addresses and failing to unguard the page, resulting in
2497 // an endless loop. This condition is probably even more unlikely
2498 // than the first.
2499 //
2500 // Although both cases could be avoided by using locks or thread
2501 // local last_addr, these solutions are unnecessary complication:
2502 // this handler is a best-effort safety net, not a complete solution.
2503 // It is disabled by default and should only be used as a workaround
2504 // in case we missed any no-execute-unsafe VM code.
2505
2506 last_addr = addr;
2507
2508 return EXCEPTION_CONTINUE_EXECUTION;
2509 }
2510 }
2511
2512 // Last unguard failed or not unguarding
2513 tty->print_raw_cr("Execution protection violation");
2514 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2515 exceptionInfo->ContextRecord);
2516 return EXCEPTION_CONTINUE_SEARCH;
2517 }
2518 }
2519 #endif // _WIN64
2520
2521 // Check to see if we caught the safepoint code in the
2522 // process of write protecting the memory serialization page.
2523 // It write enables the page immediately after protecting it
2524 // so just return.
2525 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2526 JavaThread* thread = (JavaThread*) t;
2527 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2528 address addr = (address) exceptionRecord->ExceptionInformation[1];
2529 if (os::is_memory_serialize_page(thread, addr)) {
2530 // Block current thread until the memory serialize page permission restored.
2531 os::block_on_serialize_page_trap();
2532 return EXCEPTION_CONTINUE_EXECUTION;
2533 }
2534 }
2535
2536 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2537 VM_Version::is_cpuinfo_segv_addr(pc)) {
2538 // Verify that OS save/restore AVX registers.
2539 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2540 }
2541
2542 if (t != NULL && t->is_Java_thread()) {
2543 JavaThread* thread = (JavaThread*) t;
2544 bool in_java = thread->thread_state() == _thread_in_Java;
2545
2546 // Handle potential stack overflows up front.
2547 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2548 if (os::uses_stack_guard_pages()) {
2549 #ifdef _M_IA64
2550 // Use guard page for register stack.
2551 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2552 address addr = (address) exceptionRecord->ExceptionInformation[1];
2553 // Check for a register stack overflow on Itanium
2554 if (thread->addr_inside_register_stack_red_zone(addr)) {
2555 // Fatal red zone violation happens if the Java program
2556 // catches a StackOverflow error and does so much processing
2557 // that it runs beyond the unprotected yellow guard zone. As
2558 // a result, we are out of here.
2559 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2560 } else if(thread->addr_inside_register_stack(addr)) {
2561 // Disable the yellow zone which sets the state that
2562 // we've got a stack overflow problem.
2563 if (thread->stack_yellow_zone_enabled()) {
2564 thread->disable_stack_yellow_zone();
2565 }
2566 // Give us some room to process the exception.
2567 thread->disable_register_stack_guard();
2568 // Tracing with +Verbose.
2569 if (Verbose) {
2570 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2571 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2572 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2573 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2574 thread->register_stack_base(),
2575 thread->register_stack_base() + thread->stack_size());
2576 }
2577
2578 // Reguard the permanent register stack red zone just to be sure.
2579 // We saw Windows silently disabling this without telling us.
2580 thread->enable_register_stack_red_zone();
2581
2582 return Handle_Exception(exceptionInfo,
2583 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2584 }
2585 #endif
2586 if (thread->stack_guards_enabled()) {
2587 if (_thread_in_Java) {
2588 frame fr;
2589 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2590 address addr = (address) exceptionRecord->ExceptionInformation[1];
2591 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2592 assert(fr.is_java_frame(), "Must be a Java frame");
2593 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2594 }
2595 }
2596 // Yellow zone violation. The o/s has unprotected the first yellow
2597 // zone page for us. Note: must call disable_stack_yellow_zone to
2598 // update the enabled status, even if the zone contains only one page.
2599 thread->disable_stack_yellow_zone();
2600 // If not in java code, return and hope for the best.
2601 return in_java
2602 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2603 : EXCEPTION_CONTINUE_EXECUTION;
2604 } else {
2605 // Fatal red zone violation.
2606 thread->disable_stack_red_zone();
2607 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2608 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2609 exceptionInfo->ContextRecord);
2610 return EXCEPTION_CONTINUE_SEARCH;
2611 }
2612 } else if (in_java) {
2613 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2614 // a one-time-only guard page, which it has released to us. The next
2615 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2616 return Handle_Exception(exceptionInfo,
2617 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2618 } else {
2619 // Can only return and hope for the best. Further stack growth will
2620 // result in an ACCESS_VIOLATION.
2621 return EXCEPTION_CONTINUE_EXECUTION;
2622 }
2623 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2624 // Either stack overflow or null pointer exception.
2625 if (in_java) {
2626 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2627 address addr = (address) exceptionRecord->ExceptionInformation[1];
2628 address stack_end = thread->stack_base() - thread->stack_size();
2629 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2630 // Stack overflow.
2631 assert(!os::uses_stack_guard_pages(),
2632 "should be caught by red zone code above.");
2633 return Handle_Exception(exceptionInfo,
2634 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2635 }
2636 // Check for safepoint polling and implicit null
2637 // We only expect null pointers in the stubs (vtable)
2638 // the rest are checked explicitly now.
2639 CodeBlob* cb = CodeCache::find_blob(pc);
2640 if (cb != NULL) {
2641 if (os::is_poll_address(addr)) {
2642 address stub = SharedRuntime::get_poll_stub(pc);
2643 return Handle_Exception(exceptionInfo, stub);
2644 }
2645 }
2646 {
2647 #ifdef _WIN64
2648 // If it's a legal stack address map the entire region in
2649 //
2650 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2651 address addr = (address) exceptionRecord->ExceptionInformation[1];
2652 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2653 addr = (address)((uintptr_t)addr &
2654 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2655 os::commit_memory((char *)addr, thread->stack_base() - addr,
2656 !ExecMem);
2657 return EXCEPTION_CONTINUE_EXECUTION;
2658 } else
2659 #endif
2660 {
2661 // Null pointer exception.
2662 #ifdef _M_IA64
2663 // Process implicit null checks in compiled code. Note: Implicit null checks
2664 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2665 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2666 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2667 // Handle implicit null check in UEP method entry
2668 if (cb && (cb->is_frame_complete_at(pc) ||
2669 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2670 if (Verbose) {
2671 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2672 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2673 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2674 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2675 *(bundle_start + 1), *bundle_start);
2676 }
2677 return Handle_Exception(exceptionInfo,
2678 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2679 }
2680 }
2681
2682 // Implicit null checks were processed above. Hence, we should not reach
2683 // here in the usual case => die!
2684 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2685 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2686 exceptionInfo->ContextRecord);
2687 return EXCEPTION_CONTINUE_SEARCH;
2688
2689 #else // !IA64
2690
2691 // Windows 98 reports faulting addresses incorrectly
2692 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2693 !os::win32::is_nt()) {
2694 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2695 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2696 }
2697 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2698 exceptionInfo->ContextRecord);
2699 return EXCEPTION_CONTINUE_SEARCH;
2700 #endif
2701 }
2702 }
2703 }
2704
2705 #ifdef _WIN64
2706 // Special care for fast JNI field accessors.
2707 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2708 // in and the heap gets shrunk before the field access.
2709 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2710 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2711 if (addr != (address)-1) {
2712 return Handle_Exception(exceptionInfo, addr);
2713 }
2714 }
2715 #endif
2716
2717 // Stack overflow or null pointer exception in native code.
2718 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2719 exceptionInfo->ContextRecord);
2720 return EXCEPTION_CONTINUE_SEARCH;
2721 } // /EXCEPTION_ACCESS_VIOLATION
2722 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2723 #if defined _M_IA64
2724 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2725 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2726 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2727
2728 // Compiled method patched to be non entrant? Following conditions must apply:
2729 // 1. must be first instruction in bundle
2730 // 2. must be a break instruction with appropriate code
2731 if ((((uint64_t) pc & 0x0F) == 0) &&
2732 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2733 return Handle_Exception(exceptionInfo,
2734 (address)SharedRuntime::get_handle_wrong_method_stub());
2735 }
2736 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2737 #endif
2738
2739
2740 if (in_java) {
2741 switch (exception_code) {
2742 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2743 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2744
2745 case EXCEPTION_INT_OVERFLOW:
2746 return Handle_IDiv_Exception(exceptionInfo);
2747
2748 } // switch
2749 }
2750 if (((thread->thread_state() == _thread_in_Java) ||
2751 (thread->thread_state() == _thread_in_native)) &&
2752 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2753 LONG result=Handle_FLT_Exception(exceptionInfo);
2754 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2755 }
2756 }
2757
2758 if (exception_code != EXCEPTION_BREAKPOINT) {
2759 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2760 exceptionInfo->ContextRecord);
2761 }
2762 return EXCEPTION_CONTINUE_SEARCH;
2763 }
2764
2765 #ifndef _WIN64
2766 // Special care for fast JNI accessors.
2767 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2768 // the heap gets shrunk before the field access.
2769 // Need to install our own structured exception handler since native code may
2770 // install its own.
2771 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2772 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2773 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2774 address pc = (address) exceptionInfo->ContextRecord->Eip;
2775 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2776 if (addr != (address)-1) {
2777 return Handle_Exception(exceptionInfo, addr);
2778 }
2779 }
2780 return EXCEPTION_CONTINUE_SEARCH;
2781 }
2782
2783 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2784 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2785 jobject obj, \
2786 jfieldID fieldID) { \
2787 __try { \
2788 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2789 obj, \
2790 fieldID); \
2791 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2792 _exception_info())) { \
2793 } \
2794 return 0; \
2795 }
2796
2797 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2798 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2799 DEFINE_FAST_GETFIELD(jchar, char, Char)
2800 DEFINE_FAST_GETFIELD(jshort, short, Short)
2801 DEFINE_FAST_GETFIELD(jint, int, Int)
2802 DEFINE_FAST_GETFIELD(jlong, long, Long)
2803 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2804 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2805
2806 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2807 switch (type) {
2808 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2809 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2810 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2811 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2812 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2813 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2814 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2815 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2816 default: ShouldNotReachHere();
2817 }
2818 return (address)-1;
2819 }
2820 #endif
2821
2822 // Virtual Memory
2823
2824 int os::vm_page_size() { return os::win32::vm_page_size(); }
2825 int os::vm_allocation_granularity() {
2826 return os::win32::vm_allocation_granularity();
2827 }
2828
2829 // Windows large page support is available on Windows 2003. In order to use
2830 // large page memory, the administrator must first assign additional privilege
2831 // to the user:
2832 // + select Control Panel -> Administrative Tools -> Local Security Policy
2833 // + select Local Policies -> User Rights Assignment
2834 // + double click "Lock pages in memory", add users and/or groups
2835 // + reboot
2836 // Note the above steps are needed for administrator as well, as administrators
2837 // by default do not have the privilege to lock pages in memory.
2838 //
2839 // Note about Windows 2003: although the API supports committing large page
2840 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2841 // scenario, I found through experiment it only uses large page if the entire
2842 // memory region is reserved and committed in a single VirtualAlloc() call.
2843 // This makes Windows large page support more or less like Solaris ISM, in
2844 // that the entire heap must be committed upfront. This probably will change
2845 // in the future, if so the code below needs to be revisited.
2846
2847 #ifndef MEM_LARGE_PAGES
2848 #define MEM_LARGE_PAGES 0x20000000
2849 #endif
2850
2851 static HANDLE _hProcess;
2852 static HANDLE _hToken;
2853
2854 // Container for NUMA node list info
2855 class NUMANodeListHolder {
2856 private:
2857 int *_numa_used_node_list; // allocated below
2858 int _numa_used_node_count;
2859
2860 void free_node_list() {
2861 if (_numa_used_node_list != NULL) {
2862 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2863 }
2864 }
2865
2866 public:
2867 NUMANodeListHolder() {
2868 _numa_used_node_count = 0;
2869 _numa_used_node_list = NULL;
2870 // do rest of initialization in build routine (after function pointers are set up)
2871 }
2872
2873 ~NUMANodeListHolder() {
2874 free_node_list();
2875 }
2876
2877 bool build() {
2878 DWORD_PTR proc_aff_mask;
2879 DWORD_PTR sys_aff_mask;
2880 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2881 ULONG highest_node_number;
2882 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2883 free_node_list();
2884 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2885 for (unsigned int i = 0; i <= highest_node_number; i++) {
2886 ULONGLONG proc_mask_numa_node;
2887 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2888 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2889 _numa_used_node_list[_numa_used_node_count++] = i;
2890 }
2891 }
2892 return (_numa_used_node_count > 1);
2893 }
2894
2895 int get_count() { return _numa_used_node_count; }
2896 int get_node_list_entry(int n) {
2897 // for indexes out of range, returns -1
2898 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2899 }
2900
2901 } numa_node_list_holder;
2902
2903
2904
2905 static size_t _large_page_size = 0;
2906
2907 static bool resolve_functions_for_large_page_init() {
2908 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2909 os::Advapi32Dll::AdvapiAvailable();
2910 }
2911
2912 static bool request_lock_memory_privilege() {
2913 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2914 os::current_process_id());
2915
2916 LUID luid;
2917 if (_hProcess != NULL &&
2918 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2919 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2920
2921 TOKEN_PRIVILEGES tp;
2922 tp.PrivilegeCount = 1;
2923 tp.Privileges[0].Luid = luid;
2924 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2925
2926 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2927 // privilege. Check GetLastError() too. See MSDN document.
2928 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2929 (GetLastError() == ERROR_SUCCESS)) {
2930 return true;
2931 }
2932 }
2933
2934 return false;
2935 }
2936
2937 static void cleanup_after_large_page_init() {
2938 if (_hProcess) CloseHandle(_hProcess);
2939 _hProcess = NULL;
2940 if (_hToken) CloseHandle(_hToken);
2941 _hToken = NULL;
2942 }
2943
2944 static bool numa_interleaving_init() {
2945 bool success = false;
2946 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2947
2948 // print a warning if UseNUMAInterleaving flag is specified on command line
2949 bool warn_on_failure = use_numa_interleaving_specified;
2950 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2951
2952 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2953 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2954 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2955
2956 if (os::Kernel32Dll::NumaCallsAvailable()) {
2957 if (numa_node_list_holder.build()) {
2958 if (PrintMiscellaneous && Verbose) {
2959 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2960 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2961 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2962 }
2963 tty->print("\n");
2964 }
2965 success = true;
2966 } else {
2967 WARN("Process does not cover multiple NUMA nodes.");
2968 }
2969 } else {
2970 WARN("NUMA Interleaving is not supported by the operating system.");
2971 }
2972 if (!success) {
2973 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2974 }
2975 return success;
2976 #undef WARN
2977 }
2978
2979 // this routine is used whenever we need to reserve a contiguous VA range
2980 // but we need to make separate VirtualAlloc calls for each piece of the range
2981 // Reasons for doing this:
2982 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2983 // * UseNUMAInterleaving requires a separate node for each piece
2984 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2985 DWORD prot,
2986 bool should_inject_error = false) {
2987 char * p_buf;
2988 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2989 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2990 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2991
2992 // first reserve enough address space in advance since we want to be
2993 // able to break a single contiguous virtual address range into multiple
2994 // large page commits but WS2003 does not allow reserving large page space
2995 // so we just use 4K pages for reserve, this gives us a legal contiguous
2996 // address space. then we will deallocate that reservation, and re alloc
2997 // using large pages
2998 const size_t size_of_reserve = bytes + chunk_size;
2999 if (bytes > size_of_reserve) {
3000 // Overflowed.
3001 return NULL;
3002 }
3003 p_buf = (char *) VirtualAlloc(addr,
3004 size_of_reserve, // size of Reserve
3005 MEM_RESERVE,
3006 PAGE_READWRITE);
3007 // If reservation failed, return NULL
3008 if (p_buf == NULL) return NULL;
3009 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
3010 os::release_memory(p_buf, bytes + chunk_size);
3011
3012 // we still need to round up to a page boundary (in case we are using large pages)
3013 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
3014 // instead we handle this in the bytes_to_rq computation below
3015 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
3016
3017 // now go through and allocate one chunk at a time until all bytes are
3018 // allocated
3019 size_t bytes_remaining = bytes;
3020 // An overflow of align_size_up() would have been caught above
3021 // in the calculation of size_of_reserve.
3022 char * next_alloc_addr = p_buf;
3023 HANDLE hProc = GetCurrentProcess();
3024
3025 #ifdef ASSERT
3026 // Variable for the failure injection
3027 long ran_num = os::random();
3028 size_t fail_after = ran_num % bytes;
3029 #endif
3030
3031 int count=0;
3032 while (bytes_remaining) {
3033 // select bytes_to_rq to get to the next chunk_size boundary
3034
3035 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3036 // Note allocate and commit
3037 char * p_new;
3038
3039 #ifdef ASSERT
3040 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3041 #else
3042 const bool inject_error_now = false;
3043 #endif
3044
3045 if (inject_error_now) {
3046 p_new = NULL;
3047 } else {
3048 if (!UseNUMAInterleaving) {
3049 p_new = (char *) VirtualAlloc(next_alloc_addr,
3050 bytes_to_rq,
3051 flags,
3052 prot);
3053 } else {
3054 // get the next node to use from the used_node_list
3055 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3056 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3057 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3058 next_alloc_addr,
3059 bytes_to_rq,
3060 flags,
3061 prot,
3062 node);
3063 }
3064 }
3065
3066 if (p_new == NULL) {
3067 // Free any allocated pages
3068 if (next_alloc_addr > p_buf) {
3069 // Some memory was committed so release it.
3070 size_t bytes_to_release = bytes - bytes_remaining;
3071 // NMT has yet to record any individual blocks, so it
3072 // need to create a dummy 'reserve' record to match
3073 // the release.
3074 MemTracker::record_virtual_memory_reserve((address)p_buf,
3075 bytes_to_release, CALLER_PC);
3076 os::release_memory(p_buf, bytes_to_release);
3077 }
3078 #ifdef ASSERT
3079 if (should_inject_error) {
3080 if (TracePageSizes && Verbose) {
3081 tty->print_cr("Reserving pages individually failed.");
3082 }
3083 }
3084 #endif
3085 return NULL;
3086 }
3087
3088 bytes_remaining -= bytes_to_rq;
3089 next_alloc_addr += bytes_to_rq;
3090 count++;
3091 }
3092 // Although the memory is allocated individually, it is returned as one.
3093 // NMT records it as one block.
3094 if ((flags & MEM_COMMIT) != 0) {
3095 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3096 } else {
3097 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3098 }
3099
3100 // made it this far, success
3101 return p_buf;
3102 }
3103
3104
3105
3106 void os::large_page_init() {
3107 if (!UseLargePages) return;
3108
3109 // print a warning if any large page related flag is specified on command line
3110 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3111 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3112 bool success = false;
3113
3114 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3115 if (resolve_functions_for_large_page_init()) {
3116 if (request_lock_memory_privilege()) {
3117 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3118 if (s) {
3119 #if defined(IA32) || defined(AMD64)
3120 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3121 WARN("JVM cannot use large pages bigger than 4mb.");
3122 } else {
3123 #endif
3124 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3125 _large_page_size = LargePageSizeInBytes;
3126 } else {
3127 _large_page_size = s;
3128 }
3129 success = true;
3130 #if defined(IA32) || defined(AMD64)
3131 }
3132 #endif
3133 } else {
3134 WARN("Large page is not supported by the processor.");
3135 }
3136 } else {
3137 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3138 }
3139 } else {
3140 WARN("Large page is not supported by the operating system.");
3141 }
3142 #undef WARN
3143
3144 const size_t default_page_size = (size_t) vm_page_size();
3145 if (success && _large_page_size > default_page_size) {
3146 _page_sizes[0] = _large_page_size;
3147 _page_sizes[1] = default_page_size;
3148 _page_sizes[2] = 0;
3149 }
3150
3151 cleanup_after_large_page_init();
3152 UseLargePages = success;
3153 }
3154
3155 // On win32, one cannot release just a part of reserved memory, it's an
3156 // all or nothing deal. When we split a reservation, we must break the
3157 // reservation into two reservations.
3158 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3159 bool realloc) {
3160 if (size > 0) {
3161 release_memory(base, size);
3162 if (realloc) {
3163 reserve_memory(split, base);
3164 }
3165 if (size != split) {
3166 reserve_memory(size - split, base + split);
3167 }
3168 }
3169 }
3170
3171 // Multiple threads can race in this code but it's not possible to unmap small sections of
3172 // virtual space to get requested alignment, like posix-like os's.
3173 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3174 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3175 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3176 "Alignment must be a multiple of allocation granularity (page size)");
3177 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3178
3179 size_t extra_size = size + alignment;
3180 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3181
3182 char* aligned_base = NULL;
3183
3184 do {
3185 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3186 if (extra_base == NULL) {
3187 return NULL;
3188 }
3189 // Do manual alignment
3190 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3191
3192 os::release_memory(extra_base, extra_size);
3193
3194 aligned_base = os::reserve_memory(size, aligned_base);
3195
3196 } while (aligned_base == NULL);
3197
3198 return aligned_base;
3199 }
3200
3201 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3202 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3203 "reserve alignment");
3204 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3205 char* res;
3206 // note that if UseLargePages is on, all the areas that require interleaving
3207 // will go thru reserve_memory_special rather than thru here.
3208 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3209 if (!use_individual) {
3210 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3211 } else {
3212 elapsedTimer reserveTimer;
3213 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3214 // in numa interleaving, we have to allocate pages individually
3215 // (well really chunks of NUMAInterleaveGranularity size)
3216 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3217 if (res == NULL) {
3218 warning("NUMA page allocation failed");
3219 }
3220 if (Verbose && PrintMiscellaneous) {
3221 reserveTimer.stop();
3222 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3223 reserveTimer.milliseconds(), reserveTimer.ticks());
3224 }
3225 }
3226 assert(res == NULL || addr == NULL || addr == res,
3227 "Unexpected address from reserve.");
3228
3229 return res;
3230 }
3231
3232 // Reserve memory at an arbitrary address, only if that area is
3233 // available (and not reserved for something else).
3234 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3235 // Windows os::reserve_memory() fails of the requested address range is
3236 // not avilable.
3237 return reserve_memory(bytes, requested_addr);
3238 }
3239
3240 size_t os::large_page_size() {
3241 return _large_page_size;
3242 }
3243
3244 bool os::can_commit_large_page_memory() {
3245 // Windows only uses large page memory when the entire region is reserved
3246 // and committed in a single VirtualAlloc() call. This may change in the
3247 // future, but with Windows 2003 it's not possible to commit on demand.
3248 return false;
3249 }
3250
3251 bool os::can_execute_large_page_memory() {
3252 return true;
3253 }
3254
3255 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3256 bool exec) {
3257 assert(UseLargePages, "only for large pages");
3258
3259 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3260 return NULL; // Fallback to small pages.
3261 }
3262
3263 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3264 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3265
3266 // with large pages, there are two cases where we need to use Individual Allocation
3267 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3268 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3269 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3270 if (TracePageSizes && Verbose) {
3271 tty->print_cr("Reserving large pages individually.");
3272 }
3273 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3274 if (p_buf == NULL) {
3275 // give an appropriate warning message
3276 if (UseNUMAInterleaving) {
3277 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3278 }
3279 if (UseLargePagesIndividualAllocation) {
3280 warning("Individually allocated large pages failed, "
3281 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3282 }
3283 return NULL;
3284 }
3285
3286 return p_buf;
3287
3288 } else {
3289 if (TracePageSizes && Verbose) {
3290 tty->print_cr("Reserving large pages in a single large chunk.");
3291 }
3292 // normal policy just allocate it all at once
3293 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3294 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3295 if (res != NULL) {
3296 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3297 }
3298
3299 return res;
3300 }
3301 }
3302
3303 bool os::release_memory_special(char* base, size_t bytes) {
3304 assert(base != NULL, "Sanity check");
3305 return release_memory(base, bytes);
3306 }
3307
3308 void os::print_statistics() {
3309 }
3310
3311 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3312 int err = os::get_last_error();
3313 char buf[256];
3314 size_t buf_len = os::lasterror(buf, sizeof(buf));
3315 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3316 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3317 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3318 }
3319
3320 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3321 if (bytes == 0) {
3322 // Don't bother the OS with noops.
3323 return true;
3324 }
3325 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3326 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3327 // Don't attempt to print anything if the OS call fails. We're
3328 // probably low on resources, so the print itself may cause crashes.
3329
3330 // unless we have NUMAInterleaving enabled, the range of a commit
3331 // is always within a reserve covered by a single VirtualAlloc
3332 // in that case we can just do a single commit for the requested size
3333 if (!UseNUMAInterleaving) {
3334 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3335 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3336 return false;
3337 }
3338 if (exec) {
3339 DWORD oldprot;
3340 // Windows doc says to use VirtualProtect to get execute permissions
3341 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3342 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3343 return false;
3344 }
3345 }
3346 return true;
3347 } else {
3348
3349 // when NUMAInterleaving is enabled, the commit might cover a range that
3350 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3351 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3352 // returns represents the number of bytes that can be committed in one step.
3353 size_t bytes_remaining = bytes;
3354 char * next_alloc_addr = addr;
3355 while (bytes_remaining > 0) {
3356 MEMORY_BASIC_INFORMATION alloc_info;
3357 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3358 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3359 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3360 PAGE_READWRITE) == NULL) {
3361 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3362 exec);)
3363 return false;
3364 }
3365 if (exec) {
3366 DWORD oldprot;
3367 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3368 PAGE_EXECUTE_READWRITE, &oldprot)) {
3369 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3370 exec);)
3371 return false;
3372 }
3373 }
3374 bytes_remaining -= bytes_to_rq;
3375 next_alloc_addr += bytes_to_rq;
3376 }
3377 }
3378 // if we made it this far, return true
3379 return true;
3380 }
3381
3382 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3383 bool exec) {
3384 // alignment_hint is ignored on this OS
3385 return pd_commit_memory(addr, size, exec);
3386 }
3387
3388 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3389 const char* mesg) {
3390 assert(mesg != NULL, "mesg must be specified");
3391 if (!pd_commit_memory(addr, size, exec)) {
3392 warn_fail_commit_memory(addr, size, exec);
3393 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3394 }
3395 }
3396
3397 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3398 size_t alignment_hint, bool exec,
3399 const char* mesg) {
3400 // alignment_hint is ignored on this OS
3401 pd_commit_memory_or_exit(addr, size, exec, mesg);
3402 }
3403
3404 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3405 if (bytes == 0) {
3406 // Don't bother the OS with noops.
3407 return true;
3408 }
3409 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3410 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3411 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3412 }
3413
3414 bool os::pd_release_memory(char* addr, size_t bytes) {
3415 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3416 }
3417
3418 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3419 return os::commit_memory(addr, size, !ExecMem);
3420 }
3421
3422 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3423 return os::uncommit_memory(addr, size);
3424 }
3425
3426 // Set protections specified
3427 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3428 bool is_committed) {
3429 unsigned int p = 0;
3430 switch (prot) {
3431 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3432 case MEM_PROT_READ: p = PAGE_READONLY; break;
3433 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3434 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3435 default:
3436 ShouldNotReachHere();
3437 }
3438
3439 DWORD old_status;
3440
3441 // Strange enough, but on Win32 one can change protection only for committed
3442 // memory, not a big deal anyway, as bytes less or equal than 64K
3443 if (!is_committed) {
3444 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3445 "cannot commit protection page");
3446 }
3447 // One cannot use os::guard_memory() here, as on Win32 guard page
3448 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3449 //
3450 // Pages in the region become guard pages. Any attempt to access a guard page
3451 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3452 // the guard page status. Guard pages thus act as a one-time access alarm.
3453 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3454 }
3455
3456 bool os::guard_memory(char* addr, size_t bytes) {
3457 DWORD old_status;
3458 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3459 }
3460
3461 bool os::unguard_memory(char* addr, size_t bytes) {
3462 DWORD old_status;
3463 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3464 }
3465
3466 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3467 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3468 void os::numa_make_global(char *addr, size_t bytes) { }
3469 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3470 bool os::numa_topology_changed() { return false; }
3471 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3472 int os::numa_get_group_id() { return 0; }
3473 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3474 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3475 // Provide an answer for UMA systems
3476 ids[0] = 0;
3477 return 1;
3478 } else {
3479 // check for size bigger than actual groups_num
3480 size = MIN2(size, numa_get_groups_num());
3481 for (int i = 0; i < (int)size; i++) {
3482 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3483 }
3484 return size;
3485 }
3486 }
3487
3488 bool os::get_page_info(char *start, page_info* info) {
3489 return false;
3490 }
3491
3492 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3493 page_info* page_found) {
3494 return end;
3495 }
3496
3497 char* os::non_memory_address_word() {
3498 // Must never look like an address returned by reserve_memory,
3499 // even in its subfields (as defined by the CPU immediate fields,
3500 // if the CPU splits constants across multiple instructions).
3501 return (char*)-1;
3502 }
3503
3504 #define MAX_ERROR_COUNT 100
3505 #define SYS_THREAD_ERROR 0xffffffffUL
3506
3507 void os::pd_start_thread(Thread* thread) {
3508 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3509 // Returns previous suspend state:
3510 // 0: Thread was not suspended
3511 // 1: Thread is running now
3512 // >1: Thread is still suspended.
3513 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3514 }
3515
3516 class HighResolutionInterval : public CHeapObj<mtThread> {
3517 // The default timer resolution seems to be 10 milliseconds.
3518 // (Where is this written down?)
3519 // If someone wants to sleep for only a fraction of the default,
3520 // then we set the timer resolution down to 1 millisecond for
3521 // the duration of their interval.
3522 // We carefully set the resolution back, since otherwise we
3523 // seem to incur an overhead (3%?) that we don't need.
3524 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3525 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3526 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3527 // timeBeginPeriod() if the relative error exceeded some threshold.
3528 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3529 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3530 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3531 // resolution timers running.
3532 private:
3533 jlong resolution;
3534 public:
3535 HighResolutionInterval(jlong ms) {
3536 resolution = ms % 10L;
3537 if (resolution != 0) {
3538 MMRESULT result = timeBeginPeriod(1L);
3539 }
3540 }
3541 ~HighResolutionInterval() {
3542 if (resolution != 0) {
3543 MMRESULT result = timeEndPeriod(1L);
3544 }
3545 resolution = 0L;
3546 }
3547 };
3548
3549 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3550 jlong limit = (jlong) MAXDWORD;
3551
3552 while (ms > limit) {
3553 int res;
3554 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3555 return res;
3556 }
3557 ms -= limit;
3558 }
3559
3560 assert(thread == Thread::current(), "thread consistency check");
3561 OSThread* osthread = thread->osthread();
3562 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3563 int result;
3564 if (interruptable) {
3565 assert(thread->is_Java_thread(), "must be java thread");
3566 JavaThread *jt = (JavaThread *) thread;
3567 ThreadBlockInVM tbivm(jt);
3568
3569 jt->set_suspend_equivalent();
3570 // cleared by handle_special_suspend_equivalent_condition() or
3571 // java_suspend_self() via check_and_wait_while_suspended()
3572
3573 HANDLE events[1];
3574 events[0] = osthread->interrupt_event();
3575 HighResolutionInterval *phri=NULL;
3576 if (!ForceTimeHighResolution) {
3577 phri = new HighResolutionInterval(ms);
3578 }
3579 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3580 result = OS_TIMEOUT;
3581 } else {
3582 ResetEvent(osthread->interrupt_event());
3583 osthread->set_interrupted(false);
3584 result = OS_INTRPT;
3585 }
3586 delete phri; //if it is NULL, harmless
3587
3588 // were we externally suspended while we were waiting?
3589 jt->check_and_wait_while_suspended();
3590 } else {
3591 assert(!thread->is_Java_thread(), "must not be java thread");
3592 Sleep((long) ms);
3593 result = OS_TIMEOUT;
3594 }
3595 return result;
3596 }
3597
3598 // Short sleep, direct OS call.
3599 //
3600 // ms = 0, means allow others (if any) to run.
3601 //
3602 void os::naked_short_sleep(jlong ms) {
3603 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3604 Sleep(ms);
3605 }
3606
3607 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3608 void os::infinite_sleep() {
3609 while (true) { // sleep forever ...
3610 Sleep(100000); // ... 100 seconds at a time
3611 }
3612 }
3613
3614 typedef BOOL (WINAPI * STTSignature)(void);
3615
3616 void os::naked_yield() {
3617 // Use either SwitchToThread() or Sleep(0)
3618 // Consider passing back the return value from SwitchToThread().
3619 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3620 SwitchToThread();
3621 } else {
3622 Sleep(0);
3623 }
3624 }
3625
3626 // Win32 only gives you access to seven real priorities at a time,
3627 // so we compress Java's ten down to seven. It would be better
3628 // if we dynamically adjusted relative priorities.
3629
3630 int os::java_to_os_priority[CriticalPriority + 1] = {
3631 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3632 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3633 THREAD_PRIORITY_LOWEST, // 2
3634 THREAD_PRIORITY_BELOW_NORMAL, // 3
3635 THREAD_PRIORITY_BELOW_NORMAL, // 4
3636 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3637 THREAD_PRIORITY_NORMAL, // 6
3638 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3639 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3640 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3641 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3642 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3643 };
3644
3645 int prio_policy1[CriticalPriority + 1] = {
3646 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3647 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3648 THREAD_PRIORITY_LOWEST, // 2
3649 THREAD_PRIORITY_BELOW_NORMAL, // 3
3650 THREAD_PRIORITY_BELOW_NORMAL, // 4
3651 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3652 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3653 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3654 THREAD_PRIORITY_HIGHEST, // 8
3655 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3656 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3657 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3658 };
3659
3660 static int prio_init() {
3661 // If ThreadPriorityPolicy is 1, switch tables
3662 if (ThreadPriorityPolicy == 1) {
3663 int i;
3664 for (i = 0; i < CriticalPriority + 1; i++) {
3665 os::java_to_os_priority[i] = prio_policy1[i];
3666 }
3667 }
3668 if (UseCriticalJavaThreadPriority) {
3669 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3670 }
3671 return 0;
3672 }
3673
3674 OSReturn os::set_native_priority(Thread* thread, int priority) {
3675 if (!UseThreadPriorities) return OS_OK;
3676 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3677 return ret ? OS_OK : OS_ERR;
3678 }
3679
3680 OSReturn os::get_native_priority(const Thread* const thread,
3681 int* priority_ptr) {
3682 if (!UseThreadPriorities) {
3683 *priority_ptr = java_to_os_priority[NormPriority];
3684 return OS_OK;
3685 }
3686 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3687 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3688 assert(false, "GetThreadPriority failed");
3689 return OS_ERR;
3690 }
3691 *priority_ptr = os_prio;
3692 return OS_OK;
3693 }
3694
3695
3696 // Hint to the underlying OS that a task switch would not be good.
3697 // Void return because it's a hint and can fail.
3698 void os::hint_no_preempt() {}
3699
3700 void os::interrupt(Thread* thread) {
3701 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3702 Threads_lock->owned_by_self(),
3703 "possibility of dangling Thread pointer");
3704
3705 OSThread* osthread = thread->osthread();
3706 osthread->set_interrupted(true);
3707 // More than one thread can get here with the same value of osthread,
3708 // resulting in multiple notifications. We do, however, want the store
3709 // to interrupted() to be visible to other threads before we post
3710 // the interrupt event.
3711 OrderAccess::release();
3712 SetEvent(osthread->interrupt_event());
3713 // For JSR166: unpark after setting status
3714 if (thread->is_Java_thread()) {
3715 ((JavaThread*)thread)->parker()->unpark();
3716 }
3717
3718 ParkEvent * ev = thread->_ParkEvent;
3719 if (ev != NULL) ev->unpark();
3720 }
3721
3722
3723 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3724 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3725 "possibility of dangling Thread pointer");
3726
3727 OSThread* osthread = thread->osthread();
3728 // There is no synchronization between the setting of the interrupt
3729 // and it being cleared here. It is critical - see 6535709 - that
3730 // we only clear the interrupt state, and reset the interrupt event,
3731 // if we are going to report that we were indeed interrupted - else
3732 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3733 // depending on the timing. By checking thread interrupt event to see
3734 // if the thread gets real interrupt thus prevent spurious wakeup.
3735 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3736 if (interrupted && clear_interrupted) {
3737 osthread->set_interrupted(false);
3738 ResetEvent(osthread->interrupt_event());
3739 } // Otherwise leave the interrupted state alone
3740
3741 return interrupted;
3742 }
3743
3744 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3745 ExtendedPC os::get_thread_pc(Thread* thread) {
3746 CONTEXT context;
3747 context.ContextFlags = CONTEXT_CONTROL;
3748 HANDLE handle = thread->osthread()->thread_handle();
3749 #ifdef _M_IA64
3750 assert(0, "Fix get_thread_pc");
3751 return ExtendedPC(NULL);
3752 #else
3753 if (GetThreadContext(handle, &context)) {
3754 #ifdef _M_AMD64
3755 return ExtendedPC((address) context.Rip);
3756 #else
3757 return ExtendedPC((address) context.Eip);
3758 #endif
3759 } else {
3760 return ExtendedPC(NULL);
3761 }
3762 #endif
3763 }
3764
3765 // GetCurrentThreadId() returns DWORD
3766 intx os::current_thread_id() { return GetCurrentThreadId(); }
3767
3768 static int _initial_pid = 0;
3769
3770 int os::current_process_id() {
3771 return (_initial_pid ? _initial_pid : _getpid());
3772 }
3773
3774 int os::win32::_vm_page_size = 0;
3775 int os::win32::_vm_allocation_granularity = 0;
3776 int os::win32::_processor_type = 0;
3777 // Processor level is not available on non-NT systems, use vm_version instead
3778 int os::win32::_processor_level = 0;
3779 julong os::win32::_physical_memory = 0;
3780 size_t os::win32::_default_stack_size = 0;
3781
3782 intx os::win32::_os_thread_limit = 0;
3783 volatile intx os::win32::_os_thread_count = 0;
3784
3785 bool os::win32::_is_nt = false;
3786 bool os::win32::_is_windows_2003 = false;
3787 bool os::win32::_is_windows_server = false;
3788
3789 // 6573254
3790 // Currently, the bug is observed across all the supported Windows releases,
3791 // including the latest one (as of this writing - Windows Server 2012 R2)
3792 bool os::win32::_has_exit_bug = true;
3793 bool os::win32::_has_performance_count = 0;
3794
3795 void os::win32::initialize_system_info() {
3796 SYSTEM_INFO si;
3797 GetSystemInfo(&si);
3798 _vm_page_size = si.dwPageSize;
3799 _vm_allocation_granularity = si.dwAllocationGranularity;
3800 _processor_type = si.dwProcessorType;
3801 _processor_level = si.wProcessorLevel;
3802 set_processor_count(si.dwNumberOfProcessors);
3803
3804 MEMORYSTATUSEX ms;
3805 ms.dwLength = sizeof(ms);
3806
3807 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3808 // dwMemoryLoad (% of memory in use)
3809 GlobalMemoryStatusEx(&ms);
3810 _physical_memory = ms.ullTotalPhys;
3811
3812 OSVERSIONINFOEX oi;
3813 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3814 GetVersionEx((OSVERSIONINFO*)&oi);
3815 switch (oi.dwPlatformId) {
3816 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3817 case VER_PLATFORM_WIN32_NT:
3818 _is_nt = true;
3819 {
3820 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3821 if (os_vers == 5002) {
3822 _is_windows_2003 = true;
3823 }
3824 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3825 oi.wProductType == VER_NT_SERVER) {
3826 _is_windows_server = true;
3827 }
3828 }
3829 break;
3830 default: fatal("Unknown platform");
3831 }
3832
3833 _default_stack_size = os::current_stack_size();
3834 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3835 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3836 "stack size not a multiple of page size");
3837
3838 initialize_performance_counter();
3839 }
3840
3841
3842 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3843 int ebuflen) {
3844 char path[MAX_PATH];
3845 DWORD size;
3846 DWORD pathLen = (DWORD)sizeof(path);
3847 HINSTANCE result = NULL;
3848
3849 // only allow library name without path component
3850 assert(strchr(name, '\\') == NULL, "path not allowed");
3851 assert(strchr(name, ':') == NULL, "path not allowed");
3852 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3853 jio_snprintf(ebuf, ebuflen,
3854 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3855 return NULL;
3856 }
3857
3858 // search system directory
3859 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3860 if (size >= pathLen) {
3861 return NULL; // truncated
3862 }
3863 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3864 return NULL; // truncated
3865 }
3866 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3867 return result;
3868 }
3869 }
3870
3871 // try Windows directory
3872 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3873 if (size >= pathLen) {
3874 return NULL; // truncated
3875 }
3876 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3877 return NULL; // truncated
3878 }
3879 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3880 return result;
3881 }
3882 }
3883
3884 jio_snprintf(ebuf, ebuflen,
3885 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3886 return NULL;
3887 }
3888
3889 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3890 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3891
3892 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3893 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3894 return TRUE;
3895 }
3896
3897 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3898 // Basic approach:
3899 // - Each exiting thread registers its intent to exit and then does so.
3900 // - A thread trying to terminate the process must wait for all
3901 // threads currently exiting to complete their exit.
3902
3903 if (os::win32::has_exit_bug()) {
3904 // The array holds handles of the threads that have started exiting by calling
3905 // _endthreadex().
3906 // Should be large enough to avoid blocking the exiting thread due to lack of
3907 // a free slot.
3908 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3909 static int handle_count = 0;
3910
3911 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3912 static CRITICAL_SECTION crit_sect;
3913 static volatile jint process_exiting = 0;
3914 int i, j;
3915 DWORD res;
3916 HANDLE hproc, hthr;
3917
3918 // The first thread that reached this point, initializes the critical section.
3919 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3920 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3921 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3922 if (what != EPT_THREAD) {
3923 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3924 }
3925 EnterCriticalSection(&crit_sect);
3926
3927 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3928 // Remove from the array those handles of the threads that have completed exiting.
3929 for (i = 0, j = 0; i < handle_count; ++i) {
3930 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3931 if (res == WAIT_TIMEOUT) {
3932 handles[j++] = handles[i];
3933 } else {
3934 if (res == WAIT_FAILED) {
3935 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3936 GetLastError(), __FILE__, __LINE__);
3937 }
3938 // Don't keep the handle, if we failed waiting for it.
3939 CloseHandle(handles[i]);
3940 }
3941 }
3942
3943 // If there's no free slot in the array of the kept handles, we'll have to
3944 // wait until at least one thread completes exiting.
3945 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3946 // Raise the priority of the oldest exiting thread to increase its chances
3947 // to complete sooner.
3948 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3949 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3950 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3951 i = (res - WAIT_OBJECT_0);
3952 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3953 for (; i < handle_count; ++i) {
3954 handles[i] = handles[i + 1];
3955 }
3956 } else {
3957 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3958 (res == WAIT_FAILED ? "failed" : "timed out"),
3959 GetLastError(), __FILE__, __LINE__);
3960 // Don't keep handles, if we failed waiting for them.
3961 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3962 CloseHandle(handles[i]);
3963 }
3964 handle_count = 0;
3965 }
3966 }
3967
3968 // Store a duplicate of the current thread handle in the array of handles.
3969 hproc = GetCurrentProcess();
3970 hthr = GetCurrentThread();
3971 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3972 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3973 warning("DuplicateHandle failed (%u) in %s: %d\n",
3974 GetLastError(), __FILE__, __LINE__);
3975 } else {
3976 ++handle_count;
3977 }
3978
3979 // The current exiting thread has stored its handle in the array, and now
3980 // should leave the critical section before calling _endthreadex().
3981
3982 } else if (what != EPT_THREAD) {
3983 if (handle_count > 0) {
3984 jlong start_time, finish_time, timeout_left;
3985 // Before ending the process, make sure all the threads that had called
3986 // _endthreadex() completed.
3987
3988 // Set the priority level of the current thread to the same value as
3989 // the priority level of exiting threads.
3990 // This is to ensure it will be given a fair chance to execute if
3991 // the timeout expires.
3992 hthr = GetCurrentThread();
3993 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3994 start_time = os::javaTimeNanos();
3995 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3996 for (i = 0; ; ) {
3997 int portion_count = handle_count - i;
3998 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3999 portion_count = MAXIMUM_WAIT_OBJECTS;
4000 }
4001 for (j = 0; j < portion_count; ++j) {
4002 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4003 }
4004 timeout_left = (finish_time - start_time) / 1000000L;
4005 if (timeout_left < 0) {
4006 timeout_left = 0;
4007 }
4008 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4009 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4010 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4011 (res == WAIT_FAILED ? "failed" : "timed out"),
4012 GetLastError(), __FILE__, __LINE__);
4013 portion_count = handle_count - i;
4014 }
4015 for (j = 0; j < portion_count; ++j) {
4016 CloseHandle(handles[i + j]);
4017 }
4018 if ((i += portion_count) >= handle_count) {
4019 break;
4020 }
4021 start_time = os::javaTimeNanos();
4022 }
4023 handle_count = 0;
4024 }
4025 }
4026
4027 LeaveCriticalSection(&crit_sect);
4028 }
4029
4030 if (OrderAccess::load_acquire(&process_exiting) != 0 &&
4031 process_exiting != (jint)GetCurrentThreadId()) {
4032 while (true) {
4033 // Some other thread is about to call exit(), so we
4034 // don't let the current thread proceed to exit() or _endthreadex()
4035 SuspendThread(GetCurrentThread());
4036 // Avoid busy-wait loop, if SuspendThread() failed.
4037 Sleep(EXIT_TIMEOUT);
4038 }
4039 }
4040 }
4041
4042 // We are here if either
4043 // - there's no 'race at exit' bug on this OS release;
4044 // - initialization of the critical section failed (unlikely);
4045 // - the current thread has stored its handle and left the critical section;
4046 // - the process-exiting thread has raised the flag and left the critical section.
4047 if (what == EPT_THREAD) {
4048 _endthreadex((unsigned)exit_code);
4049 } else if (what == EPT_PROCESS) {
4050 ::exit(exit_code);
4051 } else {
4052 _exit(exit_code);
4053 }
4054
4055 // Should not reach here
4056 return exit_code;
4057 }
4058
4059 #undef EXIT_TIMEOUT
4060
4061 void os::win32::setmode_streams() {
4062 _setmode(_fileno(stdin), _O_BINARY);
4063 _setmode(_fileno(stdout), _O_BINARY);
4064 _setmode(_fileno(stderr), _O_BINARY);
4065 }
4066
4067
4068 bool os::is_debugger_attached() {
4069 return IsDebuggerPresent() ? true : false;
4070 }
4071
4072
4073 void os::wait_for_keypress_at_exit(void) {
4074 if (PauseAtExit) {
4075 fprintf(stderr, "Press any key to continue...\n");
4076 fgetc(stdin);
4077 }
4078 }
4079
4080
4081 bool os::message_box(const char* title, const char* message) {
4082 int result = MessageBox(NULL, message, title,
4083 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4084 return result == IDYES;
4085 }
4086
4087 #ifndef PRODUCT
4088 #ifndef _WIN64
4089 // Helpers to check whether NX protection is enabled
4090 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4091 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4092 pex->ExceptionRecord->NumberParameters > 0 &&
4093 pex->ExceptionRecord->ExceptionInformation[0] ==
4094 EXCEPTION_INFO_EXEC_VIOLATION) {
4095 return EXCEPTION_EXECUTE_HANDLER;
4096 }
4097 return EXCEPTION_CONTINUE_SEARCH;
4098 }
4099
4100 void nx_check_protection() {
4101 // If NX is enabled we'll get an exception calling into code on the stack
4102 char code[] = { (char)0xC3 }; // ret
4103 void *code_ptr = (void *)code;
4104 __try {
4105 __asm call code_ptr
4106 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4107 tty->print_raw_cr("NX protection detected.");
4108 }
4109 }
4110 #endif // _WIN64
4111 #endif // PRODUCT
4112
4113 // this is called _before_ the global arguments have been parsed
4114 void os::init(void) {
4115 _initial_pid = _getpid();
4116
4117 init_random(1234567);
4118
4119 win32::initialize_system_info();
4120 win32::setmode_streams();
4121 init_page_sizes((size_t) win32::vm_page_size());
4122
4123 // This may be overridden later when argument processing is done.
4124 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4125 os::win32::is_windows_2003());
4126
4127 // Initialize main_process and main_thread
4128 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4129 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4130 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4131 fatal("DuplicateHandle failed\n");
4132 }
4133 main_thread_id = (int) GetCurrentThreadId();
4134
4135 // initialize fast thread access - only used for 32-bit
4136 win32::initialize_thread_ptr_offset();
4137 }
4138
4139 // To install functions for atexit processing
4140 extern "C" {
4141 static void perfMemory_exit_helper() {
4142 perfMemory_exit();
4143 }
4144 }
4145
4146 static jint initSock();
4147
4148 // this is called _after_ the global arguments have been parsed
4149 jint os::init_2(void) {
4150 // Allocate a single page and mark it as readable for safepoint polling
4151 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4152 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4153
4154 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4155 guarantee(return_page != NULL, "Commit Failed for polling page");
4156
4157 os::set_polling_page(polling_page);
4158
4159 #ifndef PRODUCT
4160 if (Verbose && PrintMiscellaneous) {
4161 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4162 (intptr_t)polling_page);
4163 }
4164 #endif
4165
4166 if (!UseMembar) {
4167 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4168 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4169
4170 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4171 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4172
4173 os::set_memory_serialize_page(mem_serialize_page);
4174
4175 #ifndef PRODUCT
4176 if (Verbose && PrintMiscellaneous) {
4177 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4178 (intptr_t)mem_serialize_page);
4179 }
4180 #endif
4181 }
4182
4183 // Setup Windows Exceptions
4184
4185 // for debugging float code generation bugs
4186 if (ForceFloatExceptions) {
4187 #ifndef _WIN64
4188 static long fp_control_word = 0;
4189 __asm { fstcw fp_control_word }
4190 // see Intel PPro Manual, Vol. 2, p 7-16
4191 const long precision = 0x20;
4192 const long underflow = 0x10;
4193 const long overflow = 0x08;
4194 const long zero_div = 0x04;
4195 const long denorm = 0x02;
4196 const long invalid = 0x01;
4197 fp_control_word |= invalid;
4198 __asm { fldcw fp_control_word }
4199 #endif
4200 }
4201
4202 // If stack_commit_size is 0, windows will reserve the default size,
4203 // but only commit a small portion of it.
4204 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4205 size_t default_reserve_size = os::win32::default_stack_size();
4206 size_t actual_reserve_size = stack_commit_size;
4207 if (stack_commit_size < default_reserve_size) {
4208 // If stack_commit_size == 0, we want this too
4209 actual_reserve_size = default_reserve_size;
4210 }
4211
4212 // Check minimum allowable stack size for thread creation and to initialize
4213 // the java system classes, including StackOverflowError - depends on page
4214 // size. Add a page for compiler2 recursion in main thread.
4215 // Add in 2*BytesPerWord times page size to account for VM stack during
4216 // class initialization depending on 32 or 64 bit VM.
4217 size_t min_stack_allowed =
4218 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4219 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4220 if (actual_reserve_size < min_stack_allowed) {
4221 tty->print_cr("\nThe stack size specified is too small, "
4222 "Specify at least %dk",
4223 min_stack_allowed / K);
4224 return JNI_ERR;
4225 }
4226
4227 JavaThread::set_stack_size_at_create(stack_commit_size);
4228
4229 // Calculate theoretical max. size of Threads to guard gainst artifical
4230 // out-of-memory situations, where all available address-space has been
4231 // reserved by thread stacks.
4232 assert(actual_reserve_size != 0, "Must have a stack");
4233
4234 // Calculate the thread limit when we should start doing Virtual Memory
4235 // banging. Currently when the threads will have used all but 200Mb of space.
4236 //
4237 // TODO: consider performing a similar calculation for commit size instead
4238 // as reserve size, since on a 64-bit platform we'll run into that more
4239 // often than running out of virtual memory space. We can use the
4240 // lower value of the two calculations as the os_thread_limit.
4241 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4242 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4243
4244 // at exit methods are called in the reverse order of their registration.
4245 // there is no limit to the number of functions registered. atexit does
4246 // not set errno.
4247
4248 if (PerfAllowAtExitRegistration) {
4249 // only register atexit functions if PerfAllowAtExitRegistration is set.
4250 // atexit functions can be delayed until process exit time, which
4251 // can be problematic for embedded VM situations. Embedded VMs should
4252 // call DestroyJavaVM() to assure that VM resources are released.
4253
4254 // note: perfMemory_exit_helper atexit function may be removed in
4255 // the future if the appropriate cleanup code can be added to the
4256 // VM_Exit VMOperation's doit method.
4257 if (atexit(perfMemory_exit_helper) != 0) {
4258 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4259 }
4260 }
4261
4262 #ifndef _WIN64
4263 // Print something if NX is enabled (win32 on AMD64)
4264 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4265 #endif
4266
4267 // initialize thread priority policy
4268 prio_init();
4269
4270 if (UseNUMA && !ForceNUMA) {
4271 UseNUMA = false; // We don't fully support this yet
4272 }
4273
4274 if (UseNUMAInterleaving) {
4275 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4276 bool success = numa_interleaving_init();
4277 if (!success) UseNUMAInterleaving = false;
4278 }
4279
4280 if (initSock() != JNI_OK) {
4281 return JNI_ERR;
4282 }
4283
4284 return JNI_OK;
4285 }
4286
4287 // Mark the polling page as unreadable
4288 void os::make_polling_page_unreadable(void) {
4289 DWORD old_status;
4290 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4291 PAGE_NOACCESS, &old_status)) {
4292 fatal("Could not disable polling page");
4293 }
4294 }
4295
4296 // Mark the polling page as readable
4297 void os::make_polling_page_readable(void) {
4298 DWORD old_status;
4299 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4300 PAGE_READONLY, &old_status)) {
4301 fatal("Could not enable polling page");
4302 }
4303 }
4304
4305
4306 int os::stat(const char *path, struct stat *sbuf) {
4307 char pathbuf[MAX_PATH];
4308 if (strlen(path) > MAX_PATH - 1) {
4309 errno = ENAMETOOLONG;
4310 return -1;
4311 }
4312 os::native_path(strcpy(pathbuf, path));
4313 int ret = ::stat(pathbuf, sbuf);
4314 if (sbuf != NULL && UseUTCFileTimestamp) {
4315 // Fix for 6539723. st_mtime returned from stat() is dependent on
4316 // the system timezone and so can return different values for the
4317 // same file if/when daylight savings time changes. This adjustment
4318 // makes sure the same timestamp is returned regardless of the TZ.
4319 //
4320 // See:
4321 // http://msdn.microsoft.com/library/
4322 // default.asp?url=/library/en-us/sysinfo/base/
4323 // time_zone_information_str.asp
4324 // and
4325 // http://msdn.microsoft.com/library/default.asp?url=
4326 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4327 //
4328 // NOTE: there is a insidious bug here: If the timezone is changed
4329 // after the call to stat() but before 'GetTimeZoneInformation()', then
4330 // the adjustment we do here will be wrong and we'll return the wrong
4331 // value (which will likely end up creating an invalid class data
4332 // archive). Absent a better API for this, or some time zone locking
4333 // mechanism, we'll have to live with this risk.
4334 TIME_ZONE_INFORMATION tz;
4335 DWORD tzid = GetTimeZoneInformation(&tz);
4336 int daylightBias =
4337 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4338 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4339 }
4340 return ret;
4341 }
4342
4343
4344 #define FT2INT64(ft) \
4345 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4346
4347
4348 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4349 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4350 // of a thread.
4351 //
4352 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4353 // the fast estimate available on the platform.
4354
4355 // current_thread_cpu_time() is not optimized for Windows yet
4356 jlong os::current_thread_cpu_time() {
4357 // return user + sys since the cost is the same
4358 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4359 }
4360
4361 jlong os::thread_cpu_time(Thread* thread) {
4362 // consistent with what current_thread_cpu_time() returns.
4363 return os::thread_cpu_time(thread, true /* user+sys */);
4364 }
4365
4366 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4367 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4368 }
4369
4370 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4371 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4372 // If this function changes, os::is_thread_cpu_time_supported() should too
4373 if (os::win32::is_nt()) {
4374 FILETIME CreationTime;
4375 FILETIME ExitTime;
4376 FILETIME KernelTime;
4377 FILETIME UserTime;
4378
4379 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4380 &ExitTime, &KernelTime, &UserTime) == 0) {
4381 return -1;
4382 } else if (user_sys_cpu_time) {
4383 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4384 } else {
4385 return FT2INT64(UserTime) * 100;
4386 }
4387 } else {
4388 return (jlong) timeGetTime() * 1000000;
4389 }
4390 }
4391
4392 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4393 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4394 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4395 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4396 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4397 }
4398
4399 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4400 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4401 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4402 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4403 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4404 }
4405
4406 bool os::is_thread_cpu_time_supported() {
4407 // see os::thread_cpu_time
4408 if (os::win32::is_nt()) {
4409 FILETIME CreationTime;
4410 FILETIME ExitTime;
4411 FILETIME KernelTime;
4412 FILETIME UserTime;
4413
4414 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4415 &KernelTime, &UserTime) == 0) {
4416 return false;
4417 } else {
4418 return true;
4419 }
4420 } else {
4421 return false;
4422 }
4423 }
4424
4425 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4426 // It does have primitives (PDH API) to get CPU usage and run queue length.
4427 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4428 // If we wanted to implement loadavg on Windows, we have a few options:
4429 //
4430 // a) Query CPU usage and run queue length and "fake" an answer by
4431 // returning the CPU usage if it's under 100%, and the run queue
4432 // length otherwise. It turns out that querying is pretty slow
4433 // on Windows, on the order of 200 microseconds on a fast machine.
4434 // Note that on the Windows the CPU usage value is the % usage
4435 // since the last time the API was called (and the first call
4436 // returns 100%), so we'd have to deal with that as well.
4437 //
4438 // b) Sample the "fake" answer using a sampling thread and store
4439 // the answer in a global variable. The call to loadavg would
4440 // just return the value of the global, avoiding the slow query.
4441 //
4442 // c) Sample a better answer using exponential decay to smooth the
4443 // value. This is basically the algorithm used by UNIX kernels.
4444 //
4445 // Note that sampling thread starvation could affect both (b) and (c).
4446 int os::loadavg(double loadavg[], int nelem) {
4447 return -1;
4448 }
4449
4450
4451 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4452 bool os::dont_yield() {
4453 return DontYieldALot;
4454 }
4455
4456 // This method is a slightly reworked copy of JDK's sysOpen
4457 // from src/windows/hpi/src/sys_api_md.c
4458
4459 int os::open(const char *path, int oflag, int mode) {
4460 char pathbuf[MAX_PATH];
4461
4462 if (strlen(path) > MAX_PATH - 1) {
4463 errno = ENAMETOOLONG;
4464 return -1;
4465 }
4466 os::native_path(strcpy(pathbuf, path));
4467 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4468 }
4469
4470 FILE* os::open(int fd, const char* mode) {
4471 return ::_fdopen(fd, mode);
4472 }
4473
4474 // Is a (classpath) directory empty?
4475 bool os::dir_is_empty(const char* path) {
4476 WIN32_FIND_DATA fd;
4477 HANDLE f = FindFirstFile(path, &fd);
4478 if (f == INVALID_HANDLE_VALUE) {
4479 return true;
4480 }
4481 FindClose(f);
4482 return false;
4483 }
4484
4485 // create binary file, rewriting existing file if required
4486 int os::create_binary_file(const char* path, bool rewrite_existing) {
4487 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4488 if (!rewrite_existing) {
4489 oflags |= _O_EXCL;
4490 }
4491 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4492 }
4493
4494 // return current position of file pointer
4495 jlong os::current_file_offset(int fd) {
4496 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4497 }
4498
4499 // move file pointer to the specified offset
4500 jlong os::seek_to_file_offset(int fd, jlong offset) {
4501 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4502 }
4503
4504
4505 jlong os::lseek(int fd, jlong offset, int whence) {
4506 return (jlong) ::_lseeki64(fd, offset, whence);
4507 }
4508
4509 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4510 OVERLAPPED ov;
4511 DWORD nread;
4512 BOOL result;
4513
4514 ZeroMemory(&ov, sizeof(ov));
4515 ov.Offset = (DWORD)offset;
4516 ov.OffsetHigh = (DWORD)(offset >> 32);
4517
4518 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4519
4520 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4521
4522 return result ? nread : 0;
4523 }
4524
4525
4526 // This method is a slightly reworked copy of JDK's sysNativePath
4527 // from src/windows/hpi/src/path_md.c
4528
4529 // Convert a pathname to native format. On win32, this involves forcing all
4530 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4531 // sometimes rejects '/') and removing redundant separators. The input path is
4532 // assumed to have been converted into the character encoding used by the local
4533 // system. Because this might be a double-byte encoding, care is taken to
4534 // treat double-byte lead characters correctly.
4535 //
4536 // This procedure modifies the given path in place, as the result is never
4537 // longer than the original. There is no error return; this operation always
4538 // succeeds.
4539 char * os::native_path(char *path) {
4540 char *src = path, *dst = path, *end = path;
4541 char *colon = NULL; // If a drive specifier is found, this will
4542 // point to the colon following the drive letter
4543
4544 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4545 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4546 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4547
4548 // Check for leading separators
4549 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4550 while (isfilesep(*src)) {
4551 src++;
4552 }
4553
4554 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4555 // Remove leading separators if followed by drive specifier. This
4556 // hack is necessary to support file URLs containing drive
4557 // specifiers (e.g., "file://c:/path"). As a side effect,
4558 // "/c:/path" can be used as an alternative to "c:/path".
4559 *dst++ = *src++;
4560 colon = dst;
4561 *dst++ = ':';
4562 src++;
4563 } else {
4564 src = path;
4565 if (isfilesep(src[0]) && isfilesep(src[1])) {
4566 // UNC pathname: Retain first separator; leave src pointed at
4567 // second separator so that further separators will be collapsed
4568 // into the second separator. The result will be a pathname
4569 // beginning with "\\\\" followed (most likely) by a host name.
4570 src = dst = path + 1;
4571 path[0] = '\\'; // Force first separator to '\\'
4572 }
4573 }
4574
4575 end = dst;
4576
4577 // Remove redundant separators from remainder of path, forcing all
4578 // separators to be '\\' rather than '/'. Also, single byte space
4579 // characters are removed from the end of the path because those
4580 // are not legal ending characters on this operating system.
4581 //
4582 while (*src != '\0') {
4583 if (isfilesep(*src)) {
4584 *dst++ = '\\'; src++;
4585 while (isfilesep(*src)) src++;
4586 if (*src == '\0') {
4587 // Check for trailing separator
4588 end = dst;
4589 if (colon == dst - 2) break; // "z:\\"
4590 if (dst == path + 1) break; // "\\"
4591 if (dst == path + 2 && isfilesep(path[0])) {
4592 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4593 // beginning of a UNC pathname. Even though it is not, by
4594 // itself, a valid UNC pathname, we leave it as is in order
4595 // to be consistent with the path canonicalizer as well
4596 // as the win32 APIs, which treat this case as an invalid
4597 // UNC pathname rather than as an alias for the root
4598 // directory of the current drive.
4599 break;
4600 }
4601 end = --dst; // Path does not denote a root directory, so
4602 // remove trailing separator
4603 break;
4604 }
4605 end = dst;
4606 } else {
4607 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4608 *dst++ = *src++;
4609 if (*src) *dst++ = *src++;
4610 end = dst;
4611 } else { // Copy a single-byte character
4612 char c = *src++;
4613 *dst++ = c;
4614 // Space is not a legal ending character
4615 if (c != ' ') end = dst;
4616 }
4617 }
4618 }
4619
4620 *end = '\0';
4621
4622 // For "z:", add "." to work around a bug in the C runtime library
4623 if (colon == dst - 1) {
4624 path[2] = '.';
4625 path[3] = '\0';
4626 }
4627
4628 return path;
4629 }
4630
4631 // This code is a copy of JDK's sysSetLength
4632 // from src/windows/hpi/src/sys_api_md.c
4633
4634 int os::ftruncate(int fd, jlong length) {
4635 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4636 long high = (long)(length >> 32);
4637 DWORD ret;
4638
4639 if (h == (HANDLE)(-1)) {
4640 return -1;
4641 }
4642
4643 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4644 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4645 return -1;
4646 }
4647
4648 if (::SetEndOfFile(h) == FALSE) {
4649 return -1;
4650 }
4651
4652 return 0;
4653 }
4654
4655
4656 // This code is a copy of JDK's sysSync
4657 // from src/windows/hpi/src/sys_api_md.c
4658 // except for the legacy workaround for a bug in Win 98
4659
4660 int os::fsync(int fd) {
4661 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4662
4663 if ((!::FlushFileBuffers(handle)) &&
4664 (GetLastError() != ERROR_ACCESS_DENIED)) {
4665 // from winerror.h
4666 return -1;
4667 }
4668 return 0;
4669 }
4670
4671 static int nonSeekAvailable(int, long *);
4672 static int stdinAvailable(int, long *);
4673
4674 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4675 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4676
4677 // This code is a copy of JDK's sysAvailable
4678 // from src/windows/hpi/src/sys_api_md.c
4679
4680 int os::available(int fd, jlong *bytes) {
4681 jlong cur, end;
4682 struct _stati64 stbuf64;
4683
4684 if (::_fstati64(fd, &stbuf64) >= 0) {
4685 int mode = stbuf64.st_mode;
4686 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4687 int ret;
4688 long lpbytes;
4689 if (fd == 0) {
4690 ret = stdinAvailable(fd, &lpbytes);
4691 } else {
4692 ret = nonSeekAvailable(fd, &lpbytes);
4693 }
4694 (*bytes) = (jlong)(lpbytes);
4695 return ret;
4696 }
4697 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4698 return FALSE;
4699 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4700 return FALSE;
4701 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4702 return FALSE;
4703 }
4704 *bytes = end - cur;
4705 return TRUE;
4706 } else {
4707 return FALSE;
4708 }
4709 }
4710
4711 // This code is a copy of JDK's nonSeekAvailable
4712 // from src/windows/hpi/src/sys_api_md.c
4713
4714 static int nonSeekAvailable(int fd, long *pbytes) {
4715 // This is used for available on non-seekable devices
4716 // (like both named and anonymous pipes, such as pipes
4717 // connected to an exec'd process).
4718 // Standard Input is a special case.
4719 HANDLE han;
4720
4721 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4722 return FALSE;
4723 }
4724
4725 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4726 // PeekNamedPipe fails when at EOF. In that case we
4727 // simply make *pbytes = 0 which is consistent with the
4728 // behavior we get on Solaris when an fd is at EOF.
4729 // The only alternative is to raise an Exception,
4730 // which isn't really warranted.
4731 //
4732 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4733 return FALSE;
4734 }
4735 *pbytes = 0;
4736 }
4737 return TRUE;
4738 }
4739
4740 #define MAX_INPUT_EVENTS 2000
4741
4742 // This code is a copy of JDK's stdinAvailable
4743 // from src/windows/hpi/src/sys_api_md.c
4744
4745 static int stdinAvailable(int fd, long *pbytes) {
4746 HANDLE han;
4747 DWORD numEventsRead = 0; // Number of events read from buffer
4748 DWORD numEvents = 0; // Number of events in buffer
4749 DWORD i = 0; // Loop index
4750 DWORD curLength = 0; // Position marker
4751 DWORD actualLength = 0; // Number of bytes readable
4752 BOOL error = FALSE; // Error holder
4753 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4754
4755 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4756 return FALSE;
4757 }
4758
4759 // Construct an array of input records in the console buffer
4760 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4761 if (error == 0) {
4762 return nonSeekAvailable(fd, pbytes);
4763 }
4764
4765 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4766 if (numEvents > MAX_INPUT_EVENTS) {
4767 numEvents = MAX_INPUT_EVENTS;
4768 }
4769
4770 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4771 if (lpBuffer == NULL) {
4772 return FALSE;
4773 }
4774
4775 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4776 if (error == 0) {
4777 os::free(lpBuffer);
4778 return FALSE;
4779 }
4780
4781 // Examine input records for the number of bytes available
4782 for (i=0; i<numEvents; i++) {
4783 if (lpBuffer[i].EventType == KEY_EVENT) {
4784
4785 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4786 &(lpBuffer[i].Event);
4787 if (keyRecord->bKeyDown == TRUE) {
4788 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4789 curLength++;
4790 if (*keyPressed == '\r') {
4791 actualLength = curLength;
4792 }
4793 }
4794 }
4795 }
4796
4797 if (lpBuffer != NULL) {
4798 os::free(lpBuffer);
4799 }
4800
4801 *pbytes = (long) actualLength;
4802 return TRUE;
4803 }
4804
4805 // Map a block of memory.
4806 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4807 char *addr, size_t bytes, bool read_only,
4808 bool allow_exec) {
4809 HANDLE hFile;
4810 char* base;
4811
4812 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4813 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4814 if (hFile == NULL) {
4815 if (PrintMiscellaneous && Verbose) {
4816 DWORD err = GetLastError();
4817 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4818 }
4819 return NULL;
4820 }
4821
4822 if (allow_exec) {
4823 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4824 // unless it comes from a PE image (which the shared archive is not.)
4825 // Even VirtualProtect refuses to give execute access to mapped memory
4826 // that was not previously executable.
4827 //
4828 // Instead, stick the executable region in anonymous memory. Yuck.
4829 // Penalty is that ~4 pages will not be shareable - in the future
4830 // we might consider DLLizing the shared archive with a proper PE
4831 // header so that mapping executable + sharing is possible.
4832
4833 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4834 PAGE_READWRITE);
4835 if (base == NULL) {
4836 if (PrintMiscellaneous && Verbose) {
4837 DWORD err = GetLastError();
4838 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4839 }
4840 CloseHandle(hFile);
4841 return NULL;
4842 }
4843
4844 DWORD bytes_read;
4845 OVERLAPPED overlapped;
4846 overlapped.Offset = (DWORD)file_offset;
4847 overlapped.OffsetHigh = 0;
4848 overlapped.hEvent = NULL;
4849 // ReadFile guarantees that if the return value is true, the requested
4850 // number of bytes were read before returning.
4851 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4852 if (!res) {
4853 if (PrintMiscellaneous && Verbose) {
4854 DWORD err = GetLastError();
4855 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4856 }
4857 release_memory(base, bytes);
4858 CloseHandle(hFile);
4859 return NULL;
4860 }
4861 } else {
4862 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4863 NULL /* file_name */);
4864 if (hMap == NULL) {
4865 if (PrintMiscellaneous && Verbose) {
4866 DWORD err = GetLastError();
4867 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4868 }
4869 CloseHandle(hFile);
4870 return NULL;
4871 }
4872
4873 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4874 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4875 (DWORD)bytes, addr);
4876 if (base == NULL) {
4877 if (PrintMiscellaneous && Verbose) {
4878 DWORD err = GetLastError();
4879 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4880 }
4881 CloseHandle(hMap);
4882 CloseHandle(hFile);
4883 return NULL;
4884 }
4885
4886 if (CloseHandle(hMap) == 0) {
4887 if (PrintMiscellaneous && Verbose) {
4888 DWORD err = GetLastError();
4889 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4890 }
4891 CloseHandle(hFile);
4892 return base;
4893 }
4894 }
4895
4896 if (allow_exec) {
4897 DWORD old_protect;
4898 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4899 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4900
4901 if (!res) {
4902 if (PrintMiscellaneous && Verbose) {
4903 DWORD err = GetLastError();
4904 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4905 }
4906 // Don't consider this a hard error, on IA32 even if the
4907 // VirtualProtect fails, we should still be able to execute
4908 CloseHandle(hFile);
4909 return base;
4910 }
4911 }
4912
4913 if (CloseHandle(hFile) == 0) {
4914 if (PrintMiscellaneous && Verbose) {
4915 DWORD err = GetLastError();
4916 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4917 }
4918 return base;
4919 }
4920
4921 return base;
4922 }
4923
4924
4925 // Remap a block of memory.
4926 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4927 char *addr, size_t bytes, bool read_only,
4928 bool allow_exec) {
4929 // This OS does not allow existing memory maps to be remapped so we
4930 // have to unmap the memory before we remap it.
4931 if (!os::unmap_memory(addr, bytes)) {
4932 return NULL;
4933 }
4934
4935 // There is a very small theoretical window between the unmap_memory()
4936 // call above and the map_memory() call below where a thread in native
4937 // code may be able to access an address that is no longer mapped.
4938
4939 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4940 read_only, allow_exec);
4941 }
4942
4943
4944 // Unmap a block of memory.
4945 // Returns true=success, otherwise false.
4946
4947 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4948 MEMORY_BASIC_INFORMATION mem_info;
4949 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4950 if (PrintMiscellaneous && Verbose) {
4951 DWORD err = GetLastError();
4952 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4953 }
4954 return false;
4955 }
4956
4957 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4958 // Instead, executable region was allocated using VirtualAlloc(). See
4959 // pd_map_memory() above.
4960 //
4961 // The following flags should match the 'exec_access' flages used for
4962 // VirtualProtect() in pd_map_memory().
4963 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4964 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4965 return pd_release_memory(addr, bytes);
4966 }
4967
4968 BOOL result = UnmapViewOfFile(addr);
4969 if (result == 0) {
4970 if (PrintMiscellaneous && Verbose) {
4971 DWORD err = GetLastError();
4972 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4973 }
4974 return false;
4975 }
4976 return true;
4977 }
4978
4979 void os::pause() {
4980 char filename[MAX_PATH];
4981 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4982 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4983 } else {
4984 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4985 }
4986
4987 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4988 if (fd != -1) {
4989 struct stat buf;
4990 ::close(fd);
4991 while (::stat(filename, &buf) == 0) {
4992 Sleep(100);
4993 }
4994 } else {
4995 jio_fprintf(stderr,
4996 "Could not open pause file '%s', continuing immediately.\n", filename);
4997 }
4998 }
4999
5000 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
5001 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
5002 }
5003
5004 // See the caveats for this class in os_windows.hpp
5005 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5006 // into this method and returns false. If no OS EXCEPTION was raised, returns
5007 // true.
5008 // The callback is supposed to provide the method that should be protected.
5009 //
5010 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5011 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
5012 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
5013 "crash_protection already set?");
5014
5015 bool success = true;
5016 __try {
5017 WatcherThread::watcher_thread()->set_crash_protection(this);
5018 cb.call();
5019 } __except(EXCEPTION_EXECUTE_HANDLER) {
5020 // only for protection, nothing to do
5021 success = false;
5022 }
5023 WatcherThread::watcher_thread()->set_crash_protection(NULL);
5024 return success;
5025 }
5026
5027 // An Event wraps a win32 "CreateEvent" kernel handle.
5028 //
5029 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5030 //
5031 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5032 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5033 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5034 // In addition, an unpark() operation might fetch the handle field, but the
5035 // event could recycle between the fetch and the SetEvent() operation.
5036 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5037 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5038 // on an stale but recycled handle would be harmless, but in practice this might
5039 // confuse other non-Sun code, so it's not a viable approach.
5040 //
5041 // 2: Once a win32 event handle is associated with an Event, it remains associated
5042 // with the Event. The event handle is never closed. This could be construed
5043 // as handle leakage, but only up to the maximum # of threads that have been extant
5044 // at any one time. This shouldn't be an issue, as windows platforms typically
5045 // permit a process to have hundreds of thousands of open handles.
5046 //
5047 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5048 // and release unused handles.
5049 //
5050 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5051 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5052 //
5053 // 5. Use an RCU-like mechanism (Read-Copy Update).
5054 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5055 //
5056 // We use (2).
5057 //
5058 // TODO-FIXME:
5059 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5060 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5061 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5062 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5063 // into a single win32 CreateEvent() handle.
5064 //
5065 // Assumption:
5066 // Only one parker can exist on an event, which is why we allocate
5067 // them per-thread. Multiple unparkers can coexist.
5068 //
5069 // _Event transitions in park()
5070 // -1 => -1 : illegal
5071 // 1 => 0 : pass - return immediately
5072 // 0 => -1 : block; then set _Event to 0 before returning
5073 //
5074 // _Event transitions in unpark()
5075 // 0 => 1 : just return
5076 // 1 => 1 : just return
5077 // -1 => either 0 or 1; must signal target thread
5078 // That is, we can safely transition _Event from -1 to either
5079 // 0 or 1.
5080 //
5081 // _Event serves as a restricted-range semaphore.
5082 // -1 : thread is blocked, i.e. there is a waiter
5083 // 0 : neutral: thread is running or ready,
5084 // could have been signaled after a wait started
5085 // 1 : signaled - thread is running or ready
5086 //
5087 // Another possible encoding of _Event would be with
5088 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5089 //
5090
5091 int os::PlatformEvent::park(jlong Millis) {
5092 // Transitions for _Event:
5093 // -1 => -1 : illegal
5094 // 1 => 0 : pass - return immediately
5095 // 0 => -1 : block; then set _Event to 0 before returning
5096
5097 guarantee(_ParkHandle != NULL , "Invariant");
5098 guarantee(Millis > 0 , "Invariant");
5099
5100 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5101 // the initial park() operation.
5102 // Consider: use atomic decrement instead of CAS-loop
5103
5104 int v;
5105 for (;;) {
5106 v = _Event;
5107 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5108 }
5109 guarantee((v == 0) || (v == 1), "invariant");
5110 if (v != 0) return OS_OK;
5111
5112 // Do this the hard way by blocking ...
5113 // TODO: consider a brief spin here, gated on the success of recent
5114 // spin attempts by this thread.
5115 //
5116 // We decompose long timeouts into series of shorter timed waits.
5117 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5118 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5119 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5120 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5121 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5122 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5123 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5124 // for the already waited time. This policy does not admit any new outcomes.
5125 // In the future, however, we might want to track the accumulated wait time and
5126 // adjust Millis accordingly if we encounter a spurious wakeup.
5127
5128 const int MAXTIMEOUT = 0x10000000;
5129 DWORD rv = WAIT_TIMEOUT;
5130 while (_Event < 0 && Millis > 0) {
5131 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5132 if (Millis > MAXTIMEOUT) {
5133 prd = MAXTIMEOUT;
5134 }
5135 rv = ::WaitForSingleObject(_ParkHandle, prd);
5136 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5137 if (rv == WAIT_TIMEOUT) {
5138 Millis -= prd;
5139 }
5140 }
5141 v = _Event;
5142 _Event = 0;
5143 // see comment at end of os::PlatformEvent::park() below:
5144 OrderAccess::fence();
5145 // If we encounter a nearly simultanous timeout expiry and unpark()
5146 // we return OS_OK indicating we awoke via unpark().
5147 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5148 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5149 }
5150
5151 void os::PlatformEvent::park() {
5152 // Transitions for _Event:
5153 // -1 => -1 : illegal
5154 // 1 => 0 : pass - return immediately
5155 // 0 => -1 : block; then set _Event to 0 before returning
5156
5157 guarantee(_ParkHandle != NULL, "Invariant");
5158 // Invariant: Only the thread associated with the Event/PlatformEvent
5159 // may call park().
5160 // Consider: use atomic decrement instead of CAS-loop
5161 int v;
5162 for (;;) {
5163 v = _Event;
5164 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5165 }
5166 guarantee((v == 0) || (v == 1), "invariant");
5167 if (v != 0) return;
5168
5169 // Do this the hard way by blocking ...
5170 // TODO: consider a brief spin here, gated on the success of recent
5171 // spin attempts by this thread.
5172 while (_Event < 0) {
5173 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5174 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5175 }
5176
5177 // Usually we'll find _Event == 0 at this point, but as
5178 // an optional optimization we clear it, just in case can
5179 // multiple unpark() operations drove _Event up to 1.
5180 _Event = 0;
5181 OrderAccess::fence();
5182 guarantee(_Event >= 0, "invariant");
5183 }
5184
5185 void os::PlatformEvent::unpark() {
5186 guarantee(_ParkHandle != NULL, "Invariant");
5187
5188 // Transitions for _Event:
5189 // 0 => 1 : just return
5190 // 1 => 1 : just return
5191 // -1 => either 0 or 1; must signal target thread
5192 // That is, we can safely transition _Event from -1 to either
5193 // 0 or 1.
5194 // See also: "Semaphores in Plan 9" by Mullender & Cox
5195 //
5196 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5197 // that it will take two back-to-back park() calls for the owning
5198 // thread to block. This has the benefit of forcing a spurious return
5199 // from the first park() call after an unpark() call which will help
5200 // shake out uses of park() and unpark() without condition variables.
5201
5202 if (Atomic::xchg(1, &_Event) >= 0) return;
5203
5204 ::SetEvent(_ParkHandle);
5205 }
5206
5207
5208 // JSR166
5209 // -------------------------------------------------------
5210
5211 // The Windows implementation of Park is very straightforward: Basic
5212 // operations on Win32 Events turn out to have the right semantics to
5213 // use them directly. We opportunistically resuse the event inherited
5214 // from Monitor.
5215
5216 void Parker::park(bool isAbsolute, jlong time) {
5217 guarantee(_ParkEvent != NULL, "invariant");
5218 // First, demultiplex/decode time arguments
5219 if (time < 0) { // don't wait
5220 return;
5221 } else if (time == 0 && !isAbsolute) {
5222 time = INFINITE;
5223 } else if (isAbsolute) {
5224 time -= os::javaTimeMillis(); // convert to relative time
5225 if (time <= 0) { // already elapsed
5226 return;
5227 }
5228 } else { // relative
5229 time /= 1000000; // Must coarsen from nanos to millis
5230 if (time == 0) { // Wait for the minimal time unit if zero
5231 time = 1;
5232 }
5233 }
5234
5235 JavaThread* thread = JavaThread::current();
5236
5237 // Don't wait if interrupted or already triggered
5238 if (Thread::is_interrupted(thread, false) ||
5239 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5240 ResetEvent(_ParkEvent);
5241 return;
5242 } else {
5243 ThreadBlockInVM tbivm(thread);
5244 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5245 thread->set_suspend_equivalent();
5246
5247 WaitForSingleObject(_ParkEvent, time);
5248 ResetEvent(_ParkEvent);
5249
5250 // If externally suspended while waiting, re-suspend
5251 if (thread->handle_special_suspend_equivalent_condition()) {
5252 thread->java_suspend_self();
5253 }
5254 }
5255 }
5256
5257 void Parker::unpark() {
5258 guarantee(_ParkEvent != NULL, "invariant");
5259 SetEvent(_ParkEvent);
5260 }
5261
5262 // Run the specified command in a separate process. Return its exit value,
5263 // or -1 on failure (e.g. can't create a new process).
5264 int os::fork_and_exec(char* cmd) {
5265 STARTUPINFO si;
5266 PROCESS_INFORMATION pi;
5267
5268 memset(&si, 0, sizeof(si));
5269 si.cb = sizeof(si);
5270 memset(&pi, 0, sizeof(pi));
5271 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5272 cmd, // command line
5273 NULL, // process security attribute
5274 NULL, // thread security attribute
5275 TRUE, // inherits system handles
5276 0, // no creation flags
5277 NULL, // use parent's environment block
5278 NULL, // use parent's starting directory
5279 &si, // (in) startup information
5280 &pi); // (out) process information
5281
5282 if (rslt) {
5283 // Wait until child process exits.
5284 WaitForSingleObject(pi.hProcess, INFINITE);
5285
5286 DWORD exit_code;
5287 GetExitCodeProcess(pi.hProcess, &exit_code);
5288
5289 // Close process and thread handles.
5290 CloseHandle(pi.hProcess);
5291 CloseHandle(pi.hThread);
5292
5293 return (int)exit_code;
5294 } else {
5295 return -1;
5296 }
5297 }
5298
5299 //--------------------------------------------------------------------------------------------------
5300 // Non-product code
5301
5302 static int mallocDebugIntervalCounter = 0;
5303 static int mallocDebugCounter = 0;
5304 bool os::check_heap(bool force) {
5305 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5306 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5307 // Note: HeapValidate executes two hardware breakpoints when it finds something
5308 // wrong; at these points, eax contains the address of the offending block (I think).
5309 // To get to the exlicit error message(s) below, just continue twice.
5310 //
5311 // Note: we want to check the CRT heap, which is not necessarily located in the
5312 // process default heap.
5313 HANDLE heap = (HANDLE) _get_heap_handle();
5314 if (!heap) {
5315 return true;
5316 }
5317
5318 // If we fail to lock the heap, then gflags.exe has been used
5319 // or some other special heap flag has been set that prevents
5320 // locking. We don't try to walk a heap we can't lock.
5321 if (HeapLock(heap) != 0) {
5322 PROCESS_HEAP_ENTRY phe;
5323 phe.lpData = NULL;
5324 while (HeapWalk(heap, &phe) != 0) {
5325 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5326 !HeapValidate(heap, 0, phe.lpData)) {
5327 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5328 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5329 HeapUnlock(heap);
5330 fatal("corrupted C heap");
5331 }
5332 }
5333 DWORD err = GetLastError();
5334 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5335 HeapUnlock(heap);
5336 fatal("heap walk aborted with error %d", err);
5337 }
5338 HeapUnlock(heap);
5339 }
5340 mallocDebugIntervalCounter = 0;
5341 }
5342 return true;
5343 }
5344
5345
5346 bool os::find(address addr, outputStream* st) {
5347 // Nothing yet
5348 return false;
5349 }
5350
5351 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5352 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5353
5354 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5355 JavaThread* thread = JavaThread::current();
5356 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5357 address addr = (address) exceptionRecord->ExceptionInformation[1];
5358
5359 if (os::is_memory_serialize_page(thread, addr)) {
5360 return EXCEPTION_CONTINUE_EXECUTION;
5361 }
5362 }
5363
5364 return EXCEPTION_CONTINUE_SEARCH;
5365 }
5366
5367 // We don't build a headless jre for Windows
5368 bool os::is_headless_jre() { return false; }
5369
5370 static jint initSock() {
5371 WSADATA wsadata;
5372
5373 if (!os::WinSock2Dll::WinSock2Available()) {
5374 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5375 ::GetLastError());
5376 return JNI_ERR;
5377 }
5378
5379 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5380 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5381 ::GetLastError());
5382 return JNI_ERR;
5383 }
5384 return JNI_OK;
5385 }
5386
5387 struct hostent* os::get_host_by_name(char* name) {
5388 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5389 }
5390
5391 int os::socket_close(int fd) {
5392 return ::closesocket(fd);
5393 }
5394
5395 int os::socket(int domain, int type, int protocol) {
5396 return ::socket(domain, type, protocol);
5397 }
5398
5399 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5400 return ::connect(fd, him, len);
5401 }
5402
5403 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5404 return ::recv(fd, buf, (int)nBytes, flags);
5405 }
5406
5407 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5408 return ::send(fd, buf, (int)nBytes, flags);
5409 }
5410
5411 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5412 return ::send(fd, buf, (int)nBytes, flags);
5413 }
5414
5415 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5416 #if defined(IA32)
5417 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5418 #elif defined (AMD64)
5419 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5420 #endif
5421
5422 // returns true if thread could be suspended,
5423 // false otherwise
5424 static bool do_suspend(HANDLE* h) {
5425 if (h != NULL) {
5426 if (SuspendThread(*h) != ~0) {
5427 return true;
5428 }
5429 }
5430 return false;
5431 }
5432
5433 // resume the thread
5434 // calling resume on an active thread is a no-op
5435 static void do_resume(HANDLE* h) {
5436 if (h != NULL) {
5437 ResumeThread(*h);
5438 }
5439 }
5440
5441 // retrieve a suspend/resume context capable handle
5442 // from the tid. Caller validates handle return value.
5443 void get_thread_handle_for_extended_context(HANDLE* h,
5444 OSThread::thread_id_t tid) {
5445 if (h != NULL) {
5446 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5447 }
5448 }
5449
5450 // Thread sampling implementation
5451 //
5452 void os::SuspendedThreadTask::internal_do_task() {
5453 CONTEXT ctxt;
5454 HANDLE h = NULL;
5455
5456 // get context capable handle for thread
5457 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5458
5459 // sanity
5460 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5461 return;
5462 }
5463
5464 // suspend the thread
5465 if (do_suspend(&h)) {
5466 ctxt.ContextFlags = sampling_context_flags;
5467 // get thread context
5468 GetThreadContext(h, &ctxt);
5469 SuspendedThreadTaskContext context(_thread, &ctxt);
5470 // pass context to Thread Sampling impl
5471 do_task(context);
5472 // resume thread
5473 do_resume(&h);
5474 }
5475
5476 // close handle
5477 CloseHandle(h);
5478 }
5479
5480
5481 // Kernel32 API
5482 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5483 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5484 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5485 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5486 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5487
5488 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5489 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5490 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5491 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5492 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5493
5494
5495 BOOL os::Kernel32Dll::initialized = FALSE;
5496 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5497 assert(initialized && _GetLargePageMinimum != NULL,
5498 "GetLargePageMinimumAvailable() not yet called");
5499 return _GetLargePageMinimum();
5500 }
5501
5502 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5503 if (!initialized) {
5504 initialize();
5505 }
5506 return _GetLargePageMinimum != NULL;
5507 }
5508
5509 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5510 if (!initialized) {
5511 initialize();
5512 }
5513 return _VirtualAllocExNuma != NULL;
5514 }
5515
5516 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5517 SIZE_T bytes, DWORD flags,
5518 DWORD prot, DWORD node) {
5519 assert(initialized && _VirtualAllocExNuma != NULL,
5520 "NUMACallsAvailable() not yet called");
5521
5522 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5523 }
5524
5525 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5526 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5527 "NUMACallsAvailable() not yet called");
5528
5529 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5530 }
5531
5532 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5533 PULONGLONG proc_mask) {
5534 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5535 "NUMACallsAvailable() not yet called");
5536
5537 return _GetNumaNodeProcessorMask(node, proc_mask);
5538 }
5539
5540 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5541 ULONG FrameToCapture,
5542 PVOID* BackTrace,
5543 PULONG BackTraceHash) {
5544 if (!initialized) {
5545 initialize();
5546 }
5547
5548 if (_RtlCaptureStackBackTrace != NULL) {
5549 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5550 BackTrace, BackTraceHash);
5551 } else {
5552 return 0;
5553 }
5554 }
5555
5556 void os::Kernel32Dll::initializeCommon() {
5557 if (!initialized) {
5558 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5559 assert(handle != NULL, "Just check");
5560 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5561 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5562 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5563 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5564 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5565 initialized = TRUE;
5566 }
5567 }
5568
5569 bool os::start_debugging(char *buf, int buflen) {
5570 int len = (int)strlen(buf);
5571 char *p = &buf[len];
5572
5573 jio_snprintf(p, buflen-len,
5574 "\n\n"
5575 "Do you want to debug the problem?\n\n"
5576 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5577 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5578 "Otherwise, select 'No' to abort...",
5579 os::current_process_id(), os::current_thread_id());
5580
5581 bool yes = os::message_box("Unexpected Error", buf);
5582
5583 if (yes) {
5584 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5585 // exception. If VM is running inside a debugger, the debugger will
5586 // catch the exception. Otherwise, the breakpoint exception will reach
5587 // the default windows exception handler, which can spawn a debugger and
5588 // automatically attach to the dying VM.
5589 os::breakpoint();
5590 yes = false;
5591 }
5592 return yes;
5593 }
5594
5595 void os::Kernel32Dll::initialize() {
5596 initializeCommon();
5597 }
5598
5599
5600 // Kernel32 API
5601 inline BOOL os::Kernel32Dll::SwitchToThread() {
5602 return ::SwitchToThread();
5603 }
5604
5605 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5606 return true;
5607 }
5608
5609 // Help tools
5610 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5611 return true;
5612 }
5613
5614 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5615 DWORD th32ProcessId) {
5616 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5617 }
5618
5619 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5620 LPMODULEENTRY32 lpme) {
5621 return ::Module32First(hSnapshot, lpme);
5622 }
5623
5624 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5625 LPMODULEENTRY32 lpme) {
5626 return ::Module32Next(hSnapshot, lpme);
5627 }
5628
5629 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5630 ::GetNativeSystemInfo(lpSystemInfo);
5631 }
5632
5633 // PSAPI API
5634 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5635 HMODULE *lpModule, DWORD cb,
5636 LPDWORD lpcbNeeded) {
5637 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5638 }
5639
5640 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5641 HMODULE hModule,
5642 LPTSTR lpFilename,
5643 DWORD nSize) {
5644 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5645 }
5646
5647 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5648 HMODULE hModule,
5649 LPMODULEINFO lpmodinfo,
5650 DWORD cb) {
5651 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5652 }
5653
5654 inline BOOL os::PSApiDll::PSApiAvailable() {
5655 return true;
5656 }
5657
5658
5659 // WinSock2 API
5660 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5661 LPWSADATA lpWSAData) {
5662 return ::WSAStartup(wVersionRequested, lpWSAData);
5663 }
5664
5665 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5666 return ::gethostbyname(name);
5667 }
5668
5669 inline BOOL os::WinSock2Dll::WinSock2Available() {
5670 return true;
5671 }
5672
5673 // Advapi API
5674 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5675 BOOL DisableAllPrivileges,
5676 PTOKEN_PRIVILEGES NewState,
5677 DWORD BufferLength,
5678 PTOKEN_PRIVILEGES PreviousState,
5679 PDWORD ReturnLength) {
5680 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5681 BufferLength, PreviousState, ReturnLength);
5682 }
5683
5684 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5685 DWORD DesiredAccess,
5686 PHANDLE TokenHandle) {
5687 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5688 }
5689
5690 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5691 LPCTSTR lpName,
5692 PLUID lpLuid) {
5693 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5694 }
5695
5696 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5697 return true;
5698 }
5699
5700 void* os::get_default_process_handle() {
5701 return (void*)GetModuleHandle(NULL);
5702 }
5703
5704 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5705 // which is used to find statically linked in agents.
5706 // Additionally for windows, takes into account __stdcall names.
5707 // Parameters:
5708 // sym_name: Symbol in library we are looking for
5709 // lib_name: Name of library to look in, NULL for shared libs.
5710 // is_absolute_path == true if lib_name is absolute path to agent
5711 // such as "C:/a/b/L.dll"
5712 // == false if only the base name of the library is passed in
5713 // such as "L"
5714 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5715 bool is_absolute_path) {
5716 char *agent_entry_name;
5717 size_t len;
5718 size_t name_len;
5719 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5720 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5721 const char *start;
5722
5723 if (lib_name != NULL) {
5724 len = name_len = strlen(lib_name);
5725 if (is_absolute_path) {
5726 // Need to strip path, prefix and suffix
5727 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5728 lib_name = ++start;
5729 } else {
5730 // Need to check for drive prefix
5731 if ((start = strchr(lib_name, ':')) != NULL) {
5732 lib_name = ++start;
5733 }
5734 }
5735 if (len <= (prefix_len + suffix_len)) {
5736 return NULL;
5737 }
5738 lib_name += prefix_len;
5739 name_len = strlen(lib_name) - suffix_len;
5740 }
5741 }
5742 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5743 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5744 if (agent_entry_name == NULL) {
5745 return NULL;
5746 }
5747 if (lib_name != NULL) {
5748 const char *p = strrchr(sym_name, '@');
5749 if (p != NULL && p != sym_name) {
5750 // sym_name == _Agent_OnLoad@XX
5751 strncpy(agent_entry_name, sym_name, (p - sym_name));
5752 agent_entry_name[(p-sym_name)] = '\0';
5753 // agent_entry_name == _Agent_OnLoad
5754 strcat(agent_entry_name, "_");
5755 strncat(agent_entry_name, lib_name, name_len);
5756 strcat(agent_entry_name, p);
5757 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5758 } else {
5759 strcpy(agent_entry_name, sym_name);
5760 strcat(agent_entry_name, "_");
5761 strncat(agent_entry_name, lib_name, name_len);
5762 }
5763 } else {
5764 strcpy(agent_entry_name, sym_name);
5765 }
5766 return agent_entry_name;
5767 }
5768
5769 #ifndef PRODUCT
5770
5771 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5772 // contiguous memory block at a particular address.
5773 // The test first tries to find a good approximate address to allocate at by using the same
5774 // method to allocate some memory at any address. The test then tries to allocate memory in
5775 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5776 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5777 // the previously allocated memory is available for allocation. The only actual failure
5778 // that is reported is when the test tries to allocate at a particular location but gets a
5779 // different valid one. A NULL return value at this point is not considered an error but may
5780 // be legitimate.
5781 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5782 void TestReserveMemorySpecial_test() {
5783 if (!UseLargePages) {
5784 if (VerboseInternalVMTests) {
5785 tty->print("Skipping test because large pages are disabled");
5786 }
5787 return;
5788 }
5789 // save current value of globals
5790 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5791 bool old_use_numa_interleaving = UseNUMAInterleaving;
5792
5793 // set globals to make sure we hit the correct code path
5794 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5795
5796 // do an allocation at an address selected by the OS to get a good one.
5797 const size_t large_allocation_size = os::large_page_size() * 4;
5798 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5799 if (result == NULL) {
5800 if (VerboseInternalVMTests) {
5801 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5802 large_allocation_size);
5803 }
5804 } else {
5805 os::release_memory_special(result, large_allocation_size);
5806
5807 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5808 // we managed to get it once.
5809 const size_t expected_allocation_size = os::large_page_size();
5810 char* expected_location = result + os::large_page_size();
5811 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5812 if (actual_location == NULL) {
5813 if (VerboseInternalVMTests) {
5814 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5815 expected_location, large_allocation_size);
5816 }
5817 } else {
5818 // release memory
5819 os::release_memory_special(actual_location, expected_allocation_size);
5820 // only now check, after releasing any memory to avoid any leaks.
5821 assert(actual_location == expected_location,
5822 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5823 expected_location, expected_allocation_size, actual_location);
5824 }
5825 }
5826
5827 // restore globals
5828 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5829 UseNUMAInterleaving = old_use_numa_interleaving;
5830 }
5831 #endif // PRODUCT
5832
5833 /*
5834 All the defined signal names for Windows.
5835
5836 NOTE that not all of these names are accepted by FindSignal!
5837
5838 For various reasons some of these may be rejected at runtime.
5839
5840 Here are the names currently accepted by a user of sun.misc.Signal with
5841 1.4.1 (ignoring potential interaction with use of chaining, etc):
5842
5843 (LIST TBD)
5844
5845 */
5846 int os::get_signal_number(const char* name) {
5847 static const struct {
5848 char* name;
5849 int number;
5850 } siglabels [] =
5851 // derived from version 6.0 VC98/include/signal.h
5852 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5853 "FPE", SIGFPE, // floating point exception
5854 "SEGV", SIGSEGV, // segment violation
5855 "INT", SIGINT, // interrupt
5856 "TERM", SIGTERM, // software term signal from kill
5857 "BREAK", SIGBREAK, // Ctrl-Break sequence
5858 "ILL", SIGILL}; // illegal instruction
5859 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
5860 if(!strcmp(name, siglabels[i].name))
5861 return siglabels[i].number;
5862 return -1;
5863 }
5864
5865 // Fast current thread access
5866
5867 int os::win32::_thread_ptr_offset = 0;
5868
5869 static void call_wrapper_dummy() {}
5870
5871 // We need to call the os_exception_wrapper once so that it sets
5872 // up the offset from FS of the thread pointer.
5873 void os::win32::initialize_thread_ptr_offset() {
5874 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5875 NULL, NULL, NULL, NULL);
5876 }