1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "logging/log.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "mutex_windows.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm.h"
47 #include "prims/jvm_misc.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/atomic.inline.hpp"
50 #include "runtime/extendedPC.hpp"
51 #include "runtime/globals.hpp"
52 #include "runtime/interfaceSupport.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/mutexLocker.hpp"
56 #include "runtime/objectMonitor.hpp"
57 #include "runtime/orderAccess.inline.hpp"
58 #include "runtime/osThread.hpp"
59 #include "runtime/perfMemory.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/statSampler.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/thread.inline.hpp"
64 #include "runtime/threadCritical.hpp"
65 #include "runtime/timer.hpp"
66 #include "runtime/vm_version.hpp"
67 #include "semaphore_windows.hpp"
68 #include "services/attachListener.hpp"
69 #include "services/memTracker.hpp"
70 #include "services/runtimeService.hpp"
71 #include "utilities/decoder.hpp"
72 #include "utilities/defaultStream.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/growableArray.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/vmError.hpp"
77
78 #ifdef _DEBUG
79 #include <crtdbg.h>
80 #endif
81
82
83 #include <windows.h>
84 #include <sys/types.h>
85 #include <sys/stat.h>
86 #include <sys/timeb.h>
87 #include <objidl.h>
88 #include <shlobj.h>
89
90 #include <malloc.h>
91 #include <signal.h>
92 #include <direct.h>
93 #include <errno.h>
94 #include <fcntl.h>
95 #include <io.h>
96 #include <process.h> // For _beginthreadex(), _endthreadex()
97 #include <imagehlp.h> // For os::dll_address_to_function_name
98 // for enumerating dll libraries
99 #include <vdmdbg.h>
100
101 // for timer info max values which include all bits
102 #define ALL_64_BITS CONST64(-1)
103
104 // For DLL loading/load error detection
105 // Values of PE COFF
106 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
107 #define IMAGE_FILE_SIGNATURE_LENGTH 4
108
109 static HANDLE main_process;
110 static HANDLE main_thread;
111 static int main_thread_id;
112
113 static FILETIME process_creation_time;
114 static FILETIME process_exit_time;
115 static FILETIME process_user_time;
116 static FILETIME process_kernel_time;
117
118 #ifdef _M_IA64
119 #define __CPU__ ia64
120 #else
121 #ifdef _M_AMD64
122 #define __CPU__ amd64
123 #else
124 #define __CPU__ i486
125 #endif
126 #endif
127
128 // save DLL module handle, used by GetModuleFileName
129
130 HINSTANCE vm_lib_handle;
131
132 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
133 switch (reason) {
134 case DLL_PROCESS_ATTACH:
135 vm_lib_handle = hinst;
136 if (ForceTimeHighResolution) {
137 timeBeginPeriod(1L);
138 }
139 break;
140 case DLL_PROCESS_DETACH:
141 if (ForceTimeHighResolution) {
142 timeEndPeriod(1L);
143 }
144 break;
145 default:
146 break;
147 }
148 return true;
149 }
150
151 static inline double fileTimeAsDouble(FILETIME* time) {
152 const double high = (double) ((unsigned int) ~0);
153 const double split = 10000000.0;
154 double result = (time->dwLowDateTime / split) +
155 time->dwHighDateTime * (high/split);
156 return result;
157 }
158
159 // Implementation of os
160
161 bool os::unsetenv(const char* name) {
162 assert(name != NULL, "Null pointer");
163 return (SetEnvironmentVariable(name, NULL) == TRUE);
164 }
165
166 // No setuid programs under Windows.
167 bool os::have_special_privileges() {
168 return false;
169 }
170
171
172 // This method is a periodic task to check for misbehaving JNI applications
173 // under CheckJNI, we can add any periodic checks here.
174 // For Windows at the moment does nothing
175 void os::run_periodic_checks() {
176 return;
177 }
178
179 // previous UnhandledExceptionFilter, if there is one
180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
181
182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
183
184 void os::init_system_properties_values() {
185 // sysclasspath, java_home, dll_dir
186 {
187 char *home_path;
188 char *dll_path;
189 char *pslash;
190 char *bin = "\\bin";
191 char home_dir[MAX_PATH + 1];
192 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
193
194 if (alt_home_dir != NULL) {
195 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
196 home_dir[MAX_PATH] = '\0';
197 } else {
198 os::jvm_path(home_dir, sizeof(home_dir));
199 // Found the full path to jvm.dll.
200 // Now cut the path to <java_home>/jre if we can.
201 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
202 pslash = strrchr(home_dir, '\\');
203 if (pslash != NULL) {
204 *pslash = '\0'; // get rid of \{client|server}
205 pslash = strrchr(home_dir, '\\');
206 if (pslash != NULL) {
207 *pslash = '\0'; // get rid of \bin
208 }
209 }
210 }
211
212 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
213 if (home_path == NULL) {
214 return;
215 }
216 strcpy(home_path, home_dir);
217 Arguments::set_java_home(home_path);
218 FREE_C_HEAP_ARRAY(char, home_path);
219
220 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
221 mtInternal);
222 if (dll_path == NULL) {
223 return;
224 }
225 strcpy(dll_path, home_dir);
226 strcat(dll_path, bin);
227 Arguments::set_dll_dir(dll_path);
228 FREE_C_HEAP_ARRAY(char, dll_path);
229
230 if (!set_boot_path('\\', ';')) {
231 return;
232 }
233 }
234
235 // library_path
236 #define EXT_DIR "\\lib\\ext"
237 #define BIN_DIR "\\bin"
238 #define PACKAGE_DIR "\\Sun\\Java"
239 {
240 // Win32 library search order (See the documentation for LoadLibrary):
241 //
242 // 1. The directory from which application is loaded.
243 // 2. The system wide Java Extensions directory (Java only)
244 // 3. System directory (GetSystemDirectory)
245 // 4. Windows directory (GetWindowsDirectory)
246 // 5. The PATH environment variable
247 // 6. The current directory
248
249 char *library_path;
250 char tmp[MAX_PATH];
251 char *path_str = ::getenv("PATH");
252
253 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
254 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
255
256 library_path[0] = '\0';
257
258 GetModuleFileName(NULL, tmp, sizeof(tmp));
259 *(strrchr(tmp, '\\')) = '\0';
260 strcat(library_path, tmp);
261
262 GetWindowsDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265 strcat(library_path, PACKAGE_DIR BIN_DIR);
266
267 GetSystemDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
270
271 GetWindowsDirectory(tmp, sizeof(tmp));
272 strcat(library_path, ";");
273 strcat(library_path, tmp);
274
275 if (path_str) {
276 strcat(library_path, ";");
277 strcat(library_path, path_str);
278 }
279
280 strcat(library_path, ";.");
281
282 Arguments::set_library_path(library_path);
283 FREE_C_HEAP_ARRAY(char, library_path);
284 }
285
286 // Default extensions directory
287 {
288 char path[MAX_PATH];
289 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
290 GetWindowsDirectory(path, MAX_PATH);
291 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
292 path, PACKAGE_DIR, EXT_DIR);
293 Arguments::set_ext_dirs(buf);
294 }
295 #undef EXT_DIR
296 #undef BIN_DIR
297 #undef PACKAGE_DIR
298
299 #ifndef _WIN64
300 // set our UnhandledExceptionFilter and save any previous one
301 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
302 #endif
303
304 // Done
305 return;
306 }
307
308 void os::breakpoint() {
309 DebugBreak();
310 }
311
312 // Invoked from the BREAKPOINT Macro
313 extern "C" void breakpoint() {
314 os::breakpoint();
315 }
316
317 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
318 // So far, this method is only used by Native Memory Tracking, which is
319 // only supported on Windows XP or later.
320 //
321 int os::get_native_stack(address* stack, int frames, int toSkip) {
322 #ifdef _NMT_NOINLINE_
323 toSkip++;
324 #endif
325 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
326 for (int index = captured; index < frames; index ++) {
327 stack[index] = NULL;
328 }
329 return captured;
330 }
331
332
333 // os::current_stack_base()
334 //
335 // Returns the base of the stack, which is the stack's
336 // starting address. This function must be called
337 // while running on the stack of the thread being queried.
338
339 address os::current_stack_base() {
340 MEMORY_BASIC_INFORMATION minfo;
341 address stack_bottom;
342 size_t stack_size;
343
344 VirtualQuery(&minfo, &minfo, sizeof(minfo));
345 stack_bottom = (address)minfo.AllocationBase;
346 stack_size = minfo.RegionSize;
347
348 // Add up the sizes of all the regions with the same
349 // AllocationBase.
350 while (1) {
351 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
352 if (stack_bottom == (address)minfo.AllocationBase) {
353 stack_size += minfo.RegionSize;
354 } else {
355 break;
356 }
357 }
358
359 #ifdef _M_IA64
360 // IA64 has memory and register stacks
361 //
362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
363 // at thread creation (1MB backing store growing upwards, 1MB memory stack
364 // growing downwards, 2MB summed up)
365 //
366 // ...
367 // ------- top of stack (high address) -----
368 // |
369 // | 1MB
370 // | Backing Store (Register Stack)
371 // |
372 // | / \
373 // | |
374 // | |
375 // | |
376 // ------------------------ stack base -----
377 // | 1MB
378 // | Memory Stack
379 // |
380 // | |
381 // | |
382 // | |
383 // | \ /
384 // |
385 // ----- bottom of stack (low address) -----
386 // ...
387
388 stack_size = stack_size / 2;
389 #endif
390 return stack_bottom + stack_size;
391 }
392
393 size_t os::current_stack_size() {
394 size_t sz;
395 MEMORY_BASIC_INFORMATION minfo;
396 VirtualQuery(&minfo, &minfo, sizeof(minfo));
397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
398 return sz;
399 }
400
401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
402 const struct tm* time_struct_ptr = localtime(clock);
403 if (time_struct_ptr != NULL) {
404 *res = *time_struct_ptr;
405 return res;
406 }
407 return NULL;
408 }
409
410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
411
412 // Thread start routine for all new Java threads
413 static unsigned __stdcall java_start(Thread* thread) {
414 // Try to randomize the cache line index of hot stack frames.
415 // This helps when threads of the same stack traces evict each other's
416 // cache lines. The threads can be either from the same JVM instance, or
417 // from different JVM instances. The benefit is especially true for
418 // processors with hyperthreading technology.
419 static int counter = 0;
420 int pid = os::current_process_id();
421 _alloca(((pid ^ counter++) & 7) * 128);
422
423 thread->initialize_thread_current();
424
425 OSThread* osthr = thread->osthread();
426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
427
428 if (UseNUMA) {
429 int lgrp_id = os::numa_get_group_id();
430 if (lgrp_id != -1) {
431 thread->set_lgrp_id(lgrp_id);
432 }
433 }
434
435 // Diagnostic code to investigate JDK-6573254
436 int res = 30115; // non-java thread
437 if (thread->is_Java_thread()) {
438 res = 20115; // java thread
439 }
440
441 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
442
443 // Install a win32 structured exception handler around every thread created
444 // by VM, so VM can generate error dump when an exception occurred in non-
445 // Java thread (e.g. VM thread).
446 __try {
447 thread->run();
448 } __except(topLevelExceptionFilter(
449 (_EXCEPTION_POINTERS*)_exception_info())) {
450 // Nothing to do.
451 }
452
453 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
454
455 // One less thread is executing
456 // When the VMThread gets here, the main thread may have already exited
457 // which frees the CodeHeap containing the Atomic::add code
458 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
459 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
460 }
461
462 // Thread must not return from exit_process_or_thread(), but if it does,
463 // let it proceed to exit normally
464 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
465 }
466
467 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
468 int thread_id) {
469 // Allocate the OSThread object
470 OSThread* osthread = new OSThread(NULL, NULL);
471 if (osthread == NULL) return NULL;
472
473 // Initialize support for Java interrupts
474 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
475 if (interrupt_event == NULL) {
476 delete osthread;
477 return NULL;
478 }
479 osthread->set_interrupt_event(interrupt_event);
480
481 // Store info on the Win32 thread into the OSThread
482 osthread->set_thread_handle(thread_handle);
483 osthread->set_thread_id(thread_id);
484
485 if (UseNUMA) {
486 int lgrp_id = os::numa_get_group_id();
487 if (lgrp_id != -1) {
488 thread->set_lgrp_id(lgrp_id);
489 }
490 }
491
492 // Initial thread state is INITIALIZED, not SUSPENDED
493 osthread->set_state(INITIALIZED);
494
495 return osthread;
496 }
497
498
499 bool os::create_attached_thread(JavaThread* thread) {
500 #ifdef ASSERT
501 thread->verify_not_published();
502 #endif
503 HANDLE thread_h;
504 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
505 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
506 fatal("DuplicateHandle failed\n");
507 }
508 OSThread* osthread = create_os_thread(thread, thread_h,
509 (int)current_thread_id());
510 if (osthread == NULL) {
511 return false;
512 }
513
514 // Initial thread state is RUNNABLE
515 osthread->set_state(RUNNABLE);
516
517 thread->set_osthread(osthread);
518
519 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
520 os::current_thread_id());
521
522 return true;
523 }
524
525 bool os::create_main_thread(JavaThread* thread) {
526 #ifdef ASSERT
527 thread->verify_not_published();
528 #endif
529 if (_starting_thread == NULL) {
530 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
531 if (_starting_thread == NULL) {
532 return false;
533 }
534 }
535
536 // The primordial thread is runnable from the start)
537 _starting_thread->set_state(RUNNABLE);
538
539 thread->set_osthread(_starting_thread);
540 return true;
541 }
542
543 // Helper function to trace _beginthreadex attributes,
544 // similar to os::Posix::describe_pthread_attr()
545 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
546 size_t stacksize, unsigned initflag) {
547 stringStream ss(buf, buflen);
548 if (stacksize == 0) {
549 ss.print("stacksize: default, ");
550 } else {
551 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
552 }
553 ss.print("flags: ");
554 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
555 #define ALL(X) \
556 X(CREATE_SUSPENDED) \
557 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
558 ALL(PRINT_FLAG)
559 #undef ALL
560 #undef PRINT_FLAG
561 return buf;
562 }
563
564 // Allocate and initialize a new OSThread
565 bool os::create_thread(Thread* thread, ThreadType thr_type,
566 size_t stack_size) {
567 unsigned thread_id;
568
569 // Allocate the OSThread object
570 OSThread* osthread = new OSThread(NULL, NULL);
571 if (osthread == NULL) {
572 return false;
573 }
574
575 // Initialize support for Java interrupts
576 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
577 if (interrupt_event == NULL) {
578 delete osthread;
579 return NULL;
580 }
581 osthread->set_interrupt_event(interrupt_event);
582 osthread->set_interrupted(false);
583
584 thread->set_osthread(osthread);
585
586 if (stack_size == 0) {
587 switch (thr_type) {
588 case os::java_thread:
589 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
590 if (JavaThread::stack_size_at_create() > 0) {
591 stack_size = JavaThread::stack_size_at_create();
592 }
593 break;
594 case os::compiler_thread:
595 if (CompilerThreadStackSize > 0) {
596 stack_size = (size_t)(CompilerThreadStackSize * K);
597 break;
598 } // else fall through:
599 // use VMThreadStackSize if CompilerThreadStackSize is not defined
600 case os::vm_thread:
601 case os::pgc_thread:
602 case os::cgc_thread:
603 case os::watcher_thread:
604 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
605 break;
606 }
607 }
608
609 // Create the Win32 thread
610 //
611 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
612 // does not specify stack size. Instead, it specifies the size of
613 // initially committed space. The stack size is determined by
614 // PE header in the executable. If the committed "stack_size" is larger
615 // than default value in the PE header, the stack is rounded up to the
616 // nearest multiple of 1MB. For example if the launcher has default
617 // stack size of 320k, specifying any size less than 320k does not
618 // affect the actual stack size at all, it only affects the initial
619 // commitment. On the other hand, specifying 'stack_size' larger than
620 // default value may cause significant increase in memory usage, because
621 // not only the stack space will be rounded up to MB, but also the
622 // entire space is committed upfront.
623 //
624 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
625 // for CreateThread() that can treat 'stack_size' as stack size. However we
626 // are not supposed to call CreateThread() directly according to MSDN
627 // document because JVM uses C runtime library. The good news is that the
628 // flag appears to work with _beginthredex() as well.
629
630 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
631 HANDLE thread_handle =
632 (HANDLE)_beginthreadex(NULL,
633 (unsigned)stack_size,
634 (unsigned (__stdcall *)(void*)) java_start,
635 thread,
636 initflag,
637 &thread_id);
638
639 char buf[64];
640 if (thread_handle != NULL) {
641 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
642 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
643 } else {
644 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
645 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
646 }
647
648 if (thread_handle == NULL) {
649 // Need to clean up stuff we've allocated so far
650 CloseHandle(osthread->interrupt_event());
651 thread->set_osthread(NULL);
652 delete osthread;
653 return NULL;
654 }
655
656 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
657
658 // Store info on the Win32 thread into the OSThread
659 osthread->set_thread_handle(thread_handle);
660 osthread->set_thread_id(thread_id);
661
662 // Initial thread state is INITIALIZED, not SUSPENDED
663 osthread->set_state(INITIALIZED);
664
665 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
666 return true;
667 }
668
669
670 // Free Win32 resources related to the OSThread
671 void os::free_thread(OSThread* osthread) {
672 assert(osthread != NULL, "osthread not set");
673 CloseHandle(osthread->thread_handle());
674 CloseHandle(osthread->interrupt_event());
675 delete osthread;
676 }
677
678 static jlong first_filetime;
679 static jlong initial_performance_count;
680 static jlong performance_frequency;
681
682
683 jlong as_long(LARGE_INTEGER x) {
684 jlong result = 0; // initialization to avoid warning
685 set_high(&result, x.HighPart);
686 set_low(&result, x.LowPart);
687 return result;
688 }
689
690
691 jlong os::elapsed_counter() {
692 LARGE_INTEGER count;
693 QueryPerformanceCounter(&count);
694 return as_long(count) - initial_performance_count;
695 }
696
697
698 jlong os::elapsed_frequency() {
699 return performance_frequency;
700 }
701
702
703 julong os::available_memory() {
704 return win32::available_memory();
705 }
706
707 julong os::win32::available_memory() {
708 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
709 // value if total memory is larger than 4GB
710 MEMORYSTATUSEX ms;
711 ms.dwLength = sizeof(ms);
712 GlobalMemoryStatusEx(&ms);
713
714 return (julong)ms.ullAvailPhys;
715 }
716
717 julong os::physical_memory() {
718 return win32::physical_memory();
719 }
720
721 bool os::has_allocatable_memory_limit(julong* limit) {
722 MEMORYSTATUSEX ms;
723 ms.dwLength = sizeof(ms);
724 GlobalMemoryStatusEx(&ms);
725 #ifdef _LP64
726 *limit = (julong)ms.ullAvailVirtual;
727 return true;
728 #else
729 // Limit to 1400m because of the 2gb address space wall
730 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
731 return true;
732 #endif
733 }
734
735 int os::active_processor_count() {
736 DWORD_PTR lpProcessAffinityMask = 0;
737 DWORD_PTR lpSystemAffinityMask = 0;
738 int proc_count = processor_count();
739 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
740 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
741 // Nof active processors is number of bits in process affinity mask
742 int bitcount = 0;
743 while (lpProcessAffinityMask != 0) {
744 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
745 bitcount++;
746 }
747 return bitcount;
748 } else {
749 return proc_count;
750 }
751 }
752
753 void os::set_native_thread_name(const char *name) {
754
755 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
756 //
757 // Note that unfortunately this only works if the process
758 // is already attached to a debugger; debugger must observe
759 // the exception below to show the correct name.
760
761 const DWORD MS_VC_EXCEPTION = 0x406D1388;
762 struct {
763 DWORD dwType; // must be 0x1000
764 LPCSTR szName; // pointer to name (in user addr space)
765 DWORD dwThreadID; // thread ID (-1=caller thread)
766 DWORD dwFlags; // reserved for future use, must be zero
767 } info;
768
769 info.dwType = 0x1000;
770 info.szName = name;
771 info.dwThreadID = -1;
772 info.dwFlags = 0;
773
774 __try {
775 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
776 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
777 }
778
779 bool os::distribute_processes(uint length, uint* distribution) {
780 // Not yet implemented.
781 return false;
782 }
783
784 bool os::bind_to_processor(uint processor_id) {
785 // Not yet implemented.
786 return false;
787 }
788
789 void os::win32::initialize_performance_counter() {
790 LARGE_INTEGER count;
791 QueryPerformanceFrequency(&count);
792 performance_frequency = as_long(count);
793 QueryPerformanceCounter(&count);
794 initial_performance_count = as_long(count);
795 }
796
797
798 double os::elapsedTime() {
799 return (double) elapsed_counter() / (double) elapsed_frequency();
800 }
801
802
803 // Windows format:
804 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
805 // Java format:
806 // Java standards require the number of milliseconds since 1/1/1970
807
808 // Constant offset - calculated using offset()
809 static jlong _offset = 116444736000000000;
810 // Fake time counter for reproducible results when debugging
811 static jlong fake_time = 0;
812
813 #ifdef ASSERT
814 // Just to be safe, recalculate the offset in debug mode
815 static jlong _calculated_offset = 0;
816 static int _has_calculated_offset = 0;
817
818 jlong offset() {
819 if (_has_calculated_offset) return _calculated_offset;
820 SYSTEMTIME java_origin;
821 java_origin.wYear = 1970;
822 java_origin.wMonth = 1;
823 java_origin.wDayOfWeek = 0; // ignored
824 java_origin.wDay = 1;
825 java_origin.wHour = 0;
826 java_origin.wMinute = 0;
827 java_origin.wSecond = 0;
828 java_origin.wMilliseconds = 0;
829 FILETIME jot;
830 if (!SystemTimeToFileTime(&java_origin, &jot)) {
831 fatal("Error = %d\nWindows error", GetLastError());
832 }
833 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
834 _has_calculated_offset = 1;
835 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
836 return _calculated_offset;
837 }
838 #else
839 jlong offset() {
840 return _offset;
841 }
842 #endif
843
844 jlong windows_to_java_time(FILETIME wt) {
845 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
846 return (a - offset()) / 10000;
847 }
848
849 // Returns time ticks in (10th of micro seconds)
850 jlong windows_to_time_ticks(FILETIME wt) {
851 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
852 return (a - offset());
853 }
854
855 FILETIME java_to_windows_time(jlong l) {
856 jlong a = (l * 10000) + offset();
857 FILETIME result;
858 result.dwHighDateTime = high(a);
859 result.dwLowDateTime = low(a);
860 return result;
861 }
862
863 bool os::supports_vtime() { return true; }
864 bool os::enable_vtime() { return false; }
865 bool os::vtime_enabled() { return false; }
866
867 double os::elapsedVTime() {
868 FILETIME created;
869 FILETIME exited;
870 FILETIME kernel;
871 FILETIME user;
872 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
873 // the resolution of windows_to_java_time() should be sufficient (ms)
874 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
875 } else {
876 return elapsedTime();
877 }
878 }
879
880 jlong os::javaTimeMillis() {
881 if (UseFakeTimers) {
882 return fake_time++;
883 } else {
884 FILETIME wt;
885 GetSystemTimeAsFileTime(&wt);
886 return windows_to_java_time(wt);
887 }
888 }
889
890 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
891 FILETIME wt;
892 GetSystemTimeAsFileTime(&wt);
893 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
894 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
895 seconds = secs;
896 nanos = jlong(ticks - (secs*10000000)) * 100;
897 }
898
899 jlong os::javaTimeNanos() {
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 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
909 jlong freq = performance_frequency;
910 if (freq < NANOSECS_PER_SEC) {
911 // the performance counter is 64 bits and we will
912 // be multiplying it -- so no wrap in 64 bits
913 info_ptr->max_value = ALL_64_BITS;
914 } else if (freq > NANOSECS_PER_SEC) {
915 // use the max value the counter can reach to
916 // determine the max value which could be returned
917 julong max_counter = (julong)ALL_64_BITS;
918 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
919 } else {
920 // the performance counter is 64 bits and we will
921 // be using it directly -- so no wrap in 64 bits
922 info_ptr->max_value = ALL_64_BITS;
923 }
924
925 // using a counter, so no skipping
926 info_ptr->may_skip_backward = false;
927 info_ptr->may_skip_forward = false;
928
929 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
930 }
931
932 char* os::local_time_string(char *buf, size_t buflen) {
933 SYSTEMTIME st;
934 GetLocalTime(&st);
935 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
936 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
937 return buf;
938 }
939
940 bool os::getTimesSecs(double* process_real_time,
941 double* process_user_time,
942 double* process_system_time) {
943 HANDLE h_process = GetCurrentProcess();
944 FILETIME create_time, exit_time, kernel_time, user_time;
945 BOOL result = GetProcessTimes(h_process,
946 &create_time,
947 &exit_time,
948 &kernel_time,
949 &user_time);
950 if (result != 0) {
951 FILETIME wt;
952 GetSystemTimeAsFileTime(&wt);
953 jlong rtc_millis = windows_to_java_time(wt);
954 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
955 *process_user_time =
956 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
957 *process_system_time =
958 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
959 return true;
960 } else {
961 return false;
962 }
963 }
964
965 void os::shutdown() {
966 // allow PerfMemory to attempt cleanup of any persistent resources
967 perfMemory_exit();
968
969 // flush buffered output, finish log files
970 ostream_abort();
971
972 // Check for abort hook
973 abort_hook_t abort_hook = Arguments::abort_hook();
974 if (abort_hook != NULL) {
975 abort_hook();
976 }
977 }
978
979
980 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
981 PMINIDUMP_EXCEPTION_INFORMATION,
982 PMINIDUMP_USER_STREAM_INFORMATION,
983 PMINIDUMP_CALLBACK_INFORMATION);
984
985 static HANDLE dumpFile = NULL;
986
987 // Check if dump file can be created.
988 void os::check_dump_limit(char* buffer, size_t buffsz) {
989 bool status = true;
990 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
991 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
992 status = false;
993 }
994
995 #ifndef ASSERT
996 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
997 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
998 status = false;
999 }
1000 #endif
1001
1002 if (status) {
1003 const char* cwd = get_current_directory(NULL, 0);
1004 int pid = current_process_id();
1005 if (cwd != NULL) {
1006 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1007 } else {
1008 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1009 }
1010
1011 if (dumpFile == NULL &&
1012 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1013 == INVALID_HANDLE_VALUE) {
1014 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1015 status = false;
1016 }
1017 }
1018 VMError::record_coredump_status(buffer, status);
1019 }
1020
1021 void os::abort(bool dump_core, void* siginfo, const void* context) {
1022 HINSTANCE dbghelp;
1023 EXCEPTION_POINTERS ep;
1024 MINIDUMP_EXCEPTION_INFORMATION mei;
1025 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1026
1027 HANDLE hProcess = GetCurrentProcess();
1028 DWORD processId = GetCurrentProcessId();
1029 MINIDUMP_TYPE dumpType;
1030
1031 shutdown();
1032 if (!dump_core || dumpFile == NULL) {
1033 if (dumpFile != NULL) {
1034 CloseHandle(dumpFile);
1035 }
1036 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1037 }
1038
1039 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1040
1041 if (dbghelp == NULL) {
1042 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1043 CloseHandle(dumpFile);
1044 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1045 }
1046
1047 _MiniDumpWriteDump =
1048 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1049 PMINIDUMP_EXCEPTION_INFORMATION,
1050 PMINIDUMP_USER_STREAM_INFORMATION,
1051 PMINIDUMP_CALLBACK_INFORMATION),
1052 GetProcAddress(dbghelp,
1053 "MiniDumpWriteDump"));
1054
1055 if (_MiniDumpWriteDump == NULL) {
1056 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1057 CloseHandle(dumpFile);
1058 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1059 }
1060
1061 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1062 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1063
1064 if (siginfo != NULL && context != NULL) {
1065 ep.ContextRecord = (PCONTEXT) context;
1066 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1067
1068 mei.ThreadId = GetCurrentThreadId();
1069 mei.ExceptionPointers = &ep;
1070 pmei = &mei;
1071 } else {
1072 pmei = NULL;
1073 }
1074
1075 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1076 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1077 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1078 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1079 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1080 }
1081 CloseHandle(dumpFile);
1082 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1083 }
1084
1085 // Die immediately, no exit hook, no abort hook, no cleanup.
1086 void os::die() {
1087 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1088 }
1089
1090 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1091 // * dirent_md.c 1.15 00/02/02
1092 //
1093 // The declarations for DIR and struct dirent are in jvm_win32.h.
1094
1095 // Caller must have already run dirname through JVM_NativePath, which removes
1096 // duplicate slashes and converts all instances of '/' into '\\'.
1097
1098 DIR * os::opendir(const char *dirname) {
1099 assert(dirname != NULL, "just checking"); // hotspot change
1100 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1101 DWORD fattr; // hotspot change
1102 char alt_dirname[4] = { 0, 0, 0, 0 };
1103
1104 if (dirp == 0) {
1105 errno = ENOMEM;
1106 return 0;
1107 }
1108
1109 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1110 // as a directory in FindFirstFile(). We detect this case here and
1111 // prepend the current drive name.
1112 //
1113 if (dirname[1] == '\0' && dirname[0] == '\\') {
1114 alt_dirname[0] = _getdrive() + 'A' - 1;
1115 alt_dirname[1] = ':';
1116 alt_dirname[2] = '\\';
1117 alt_dirname[3] = '\0';
1118 dirname = alt_dirname;
1119 }
1120
1121 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1122 if (dirp->path == 0) {
1123 free(dirp);
1124 errno = ENOMEM;
1125 return 0;
1126 }
1127 strcpy(dirp->path, dirname);
1128
1129 fattr = GetFileAttributes(dirp->path);
1130 if (fattr == 0xffffffff) {
1131 free(dirp->path);
1132 free(dirp);
1133 errno = ENOENT;
1134 return 0;
1135 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1136 free(dirp->path);
1137 free(dirp);
1138 errno = ENOTDIR;
1139 return 0;
1140 }
1141
1142 // Append "*.*", or possibly "\\*.*", to path
1143 if (dirp->path[1] == ':' &&
1144 (dirp->path[2] == '\0' ||
1145 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1146 // No '\\' needed for cases like "Z:" or "Z:\"
1147 strcat(dirp->path, "*.*");
1148 } else {
1149 strcat(dirp->path, "\\*.*");
1150 }
1151
1152 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1153 if (dirp->handle == INVALID_HANDLE_VALUE) {
1154 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1155 free(dirp->path);
1156 free(dirp);
1157 errno = EACCES;
1158 return 0;
1159 }
1160 }
1161 return dirp;
1162 }
1163
1164 // parameter dbuf unused on Windows
1165 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1166 assert(dirp != NULL, "just checking"); // hotspot change
1167 if (dirp->handle == INVALID_HANDLE_VALUE) {
1168 return 0;
1169 }
1170
1171 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1172
1173 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1174 if (GetLastError() == ERROR_INVALID_HANDLE) {
1175 errno = EBADF;
1176 return 0;
1177 }
1178 FindClose(dirp->handle);
1179 dirp->handle = INVALID_HANDLE_VALUE;
1180 }
1181
1182 return &dirp->dirent;
1183 }
1184
1185 int os::closedir(DIR *dirp) {
1186 assert(dirp != NULL, "just checking"); // hotspot change
1187 if (dirp->handle != INVALID_HANDLE_VALUE) {
1188 if (!FindClose(dirp->handle)) {
1189 errno = EBADF;
1190 return -1;
1191 }
1192 dirp->handle = INVALID_HANDLE_VALUE;
1193 }
1194 free(dirp->path);
1195 free(dirp);
1196 return 0;
1197 }
1198
1199 // This must be hard coded because it's the system's temporary
1200 // directory not the java application's temp directory, ala java.io.tmpdir.
1201 const char* os::get_temp_directory() {
1202 static char path_buf[MAX_PATH];
1203 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1204 return path_buf;
1205 } else {
1206 path_buf[0] = '\0';
1207 return path_buf;
1208 }
1209 }
1210
1211 static bool file_exists(const char* filename) {
1212 if (filename == NULL || strlen(filename) == 0) {
1213 return false;
1214 }
1215 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1216 }
1217
1218 bool os::dll_build_name(char *buffer, size_t buflen,
1219 const char* pname, const char* fname) {
1220 bool retval = false;
1221 const size_t pnamelen = pname ? strlen(pname) : 0;
1222 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1223
1224 // Return error on buffer overflow.
1225 if (pnamelen + strlen(fname) + 10 > buflen) {
1226 return retval;
1227 }
1228
1229 if (pnamelen == 0) {
1230 jio_snprintf(buffer, buflen, "%s.dll", fname);
1231 retval = true;
1232 } else if (c == ':' || c == '\\') {
1233 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1234 retval = true;
1235 } else if (strchr(pname, *os::path_separator()) != NULL) {
1236 int n;
1237 char** pelements = split_path(pname, &n);
1238 if (pelements == NULL) {
1239 return false;
1240 }
1241 for (int i = 0; i < n; i++) {
1242 char* path = pelements[i];
1243 // Really shouldn't be NULL, but check can't hurt
1244 size_t plen = (path == NULL) ? 0 : strlen(path);
1245 if (plen == 0) {
1246 continue; // skip the empty path values
1247 }
1248 const char lastchar = path[plen - 1];
1249 if (lastchar == ':' || lastchar == '\\') {
1250 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1251 } else {
1252 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1253 }
1254 if (file_exists(buffer)) {
1255 retval = true;
1256 break;
1257 }
1258 }
1259 // release the storage
1260 for (int i = 0; i < n; i++) {
1261 if (pelements[i] != NULL) {
1262 FREE_C_HEAP_ARRAY(char, pelements[i]);
1263 }
1264 }
1265 if (pelements != NULL) {
1266 FREE_C_HEAP_ARRAY(char*, pelements);
1267 }
1268 } else {
1269 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1270 retval = true;
1271 }
1272 return retval;
1273 }
1274
1275 // Needs to be in os specific directory because windows requires another
1276 // header file <direct.h>
1277 const char* os::get_current_directory(char *buf, size_t buflen) {
1278 int n = static_cast<int>(buflen);
1279 if (buflen > INT_MAX) n = INT_MAX;
1280 return _getcwd(buf, n);
1281 }
1282
1283 //-----------------------------------------------------------
1284 // Helper functions for fatal error handler
1285 #ifdef _WIN64
1286 // Helper routine which returns true if address in
1287 // within the NTDLL address space.
1288 //
1289 static bool _addr_in_ntdll(address addr) {
1290 HMODULE hmod;
1291 MODULEINFO minfo;
1292
1293 hmod = GetModuleHandle("NTDLL.DLL");
1294 if (hmod == NULL) return false;
1295 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1296 &minfo, sizeof(MODULEINFO))) {
1297 return false;
1298 }
1299
1300 if ((addr >= minfo.lpBaseOfDll) &&
1301 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1302 return true;
1303 } else {
1304 return false;
1305 }
1306 }
1307 #endif
1308
1309 struct _modinfo {
1310 address addr;
1311 char* full_path; // point to a char buffer
1312 int buflen; // size of the buffer
1313 address base_addr;
1314 };
1315
1316 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1317 address top_address, void * param) {
1318 struct _modinfo *pmod = (struct _modinfo *)param;
1319 if (!pmod) return -1;
1320
1321 if (base_addr <= pmod->addr &&
1322 top_address > pmod->addr) {
1323 // if a buffer is provided, copy path name to the buffer
1324 if (pmod->full_path) {
1325 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1326 }
1327 pmod->base_addr = base_addr;
1328 return 1;
1329 }
1330 return 0;
1331 }
1332
1333 bool os::dll_address_to_library_name(address addr, char* buf,
1334 int buflen, int* offset) {
1335 // buf is not optional, but offset is optional
1336 assert(buf != NULL, "sanity check");
1337
1338 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1339 // return the full path to the DLL file, sometimes it returns path
1340 // to the corresponding PDB file (debug info); sometimes it only
1341 // returns partial path, which makes life painful.
1342
1343 struct _modinfo mi;
1344 mi.addr = addr;
1345 mi.full_path = buf;
1346 mi.buflen = buflen;
1347 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1348 // buf already contains path name
1349 if (offset) *offset = addr - mi.base_addr;
1350 return true;
1351 }
1352
1353 buf[0] = '\0';
1354 if (offset) *offset = -1;
1355 return false;
1356 }
1357
1358 bool os::dll_address_to_function_name(address addr, char *buf,
1359 int buflen, int *offset,
1360 bool demangle) {
1361 // buf is not optional, but offset is optional
1362 assert(buf != NULL, "sanity check");
1363
1364 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1365 return true;
1366 }
1367 if (offset != NULL) *offset = -1;
1368 buf[0] = '\0';
1369 return false;
1370 }
1371
1372 // save the start and end address of jvm.dll into param[0] and param[1]
1373 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1374 address top_address, void * param) {
1375 if (!param) return -1;
1376
1377 if (base_addr <= (address)_locate_jvm_dll &&
1378 top_address > (address)_locate_jvm_dll) {
1379 ((address*)param)[0] = base_addr;
1380 ((address*)param)[1] = top_address;
1381 return 1;
1382 }
1383 return 0;
1384 }
1385
1386 address vm_lib_location[2]; // start and end address of jvm.dll
1387
1388 // check if addr is inside jvm.dll
1389 bool os::address_is_in_vm(address addr) {
1390 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1391 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1392 assert(false, "Can't find jvm module.");
1393 return false;
1394 }
1395 }
1396
1397 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1398 }
1399
1400 // print module info; param is outputStream*
1401 static int _print_module(const char* fname, address base_address,
1402 address top_address, void* param) {
1403 if (!param) return -1;
1404
1405 outputStream* st = (outputStream*)param;
1406
1407 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1408 return 0;
1409 }
1410
1411 // Loads .dll/.so and
1412 // in case of error it checks if .dll/.so was built for the
1413 // same architecture as Hotspot is running on
1414 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1415 void * result = LoadLibrary(name);
1416 if (result != NULL) {
1417 return result;
1418 }
1419
1420 DWORD errcode = GetLastError();
1421 if (errcode == ERROR_MOD_NOT_FOUND) {
1422 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1423 ebuf[ebuflen - 1] = '\0';
1424 return NULL;
1425 }
1426
1427 // Parsing dll below
1428 // If we can read dll-info and find that dll was built
1429 // for an architecture other than Hotspot is running in
1430 // - then print to buffer "DLL was built for a different architecture"
1431 // else call os::lasterror to obtain system error message
1432
1433 // Read system error message into ebuf
1434 // It may or may not be overwritten below (in the for loop and just above)
1435 lasterror(ebuf, (size_t) ebuflen);
1436 ebuf[ebuflen - 1] = '\0';
1437 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1438 if (fd < 0) {
1439 return NULL;
1440 }
1441
1442 uint32_t signature_offset;
1443 uint16_t lib_arch = 0;
1444 bool failed_to_get_lib_arch =
1445 ( // Go to position 3c in the dll
1446 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1447 ||
1448 // Read location of signature
1449 (sizeof(signature_offset) !=
1450 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1451 ||
1452 // Go to COFF File Header in dll
1453 // that is located after "signature" (4 bytes long)
1454 (os::seek_to_file_offset(fd,
1455 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1456 ||
1457 // Read field that contains code of architecture
1458 // that dll was built for
1459 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1460 );
1461
1462 ::close(fd);
1463 if (failed_to_get_lib_arch) {
1464 // file i/o error - report os::lasterror(...) msg
1465 return NULL;
1466 }
1467
1468 typedef struct {
1469 uint16_t arch_code;
1470 char* arch_name;
1471 } arch_t;
1472
1473 static const arch_t arch_array[] = {
1474 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1475 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1476 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1477 };
1478 #if (defined _M_IA64)
1479 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1480 #elif (defined _M_AMD64)
1481 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1482 #elif (defined _M_IX86)
1483 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1484 #else
1485 #error Method os::dll_load requires that one of following \
1486 is defined :_M_IA64,_M_AMD64 or _M_IX86
1487 #endif
1488
1489
1490 // Obtain a string for printf operation
1491 // lib_arch_str shall contain string what platform this .dll was built for
1492 // running_arch_str shall string contain what platform Hotspot was built for
1493 char *running_arch_str = NULL, *lib_arch_str = NULL;
1494 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1495 if (lib_arch == arch_array[i].arch_code) {
1496 lib_arch_str = arch_array[i].arch_name;
1497 }
1498 if (running_arch == arch_array[i].arch_code) {
1499 running_arch_str = arch_array[i].arch_name;
1500 }
1501 }
1502
1503 assert(running_arch_str,
1504 "Didn't find running architecture code in arch_array");
1505
1506 // If the architecture is right
1507 // but some other error took place - report os::lasterror(...) msg
1508 if (lib_arch == running_arch) {
1509 return NULL;
1510 }
1511
1512 if (lib_arch_str != NULL) {
1513 ::_snprintf(ebuf, ebuflen - 1,
1514 "Can't load %s-bit .dll on a %s-bit platform",
1515 lib_arch_str, running_arch_str);
1516 } else {
1517 // don't know what architecture this dll was build for
1518 ::_snprintf(ebuf, ebuflen - 1,
1519 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1520 lib_arch, running_arch_str);
1521 }
1522
1523 return NULL;
1524 }
1525
1526 void os::print_dll_info(outputStream *st) {
1527 st->print_cr("Dynamic libraries:");
1528 get_loaded_modules_info(_print_module, (void *)st);
1529 }
1530
1531 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1532 HANDLE hProcess;
1533
1534 # define MAX_NUM_MODULES 128
1535 HMODULE modules[MAX_NUM_MODULES];
1536 static char filename[MAX_PATH];
1537 int result = 0;
1538
1539 int pid = os::current_process_id();
1540 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1541 FALSE, pid);
1542 if (hProcess == NULL) return 0;
1543
1544 DWORD size_needed;
1545 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1546 CloseHandle(hProcess);
1547 return 0;
1548 }
1549
1550 // number of modules that are currently loaded
1551 int num_modules = size_needed / sizeof(HMODULE);
1552
1553 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1554 // Get Full pathname:
1555 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1556 filename[0] = '\0';
1557 }
1558
1559 MODULEINFO modinfo;
1560 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1561 modinfo.lpBaseOfDll = NULL;
1562 modinfo.SizeOfImage = 0;
1563 }
1564
1565 // Invoke callback function
1566 result = callback(filename, (address)modinfo.lpBaseOfDll,
1567 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1568 if (result) break;
1569 }
1570
1571 CloseHandle(hProcess);
1572 return result;
1573 }
1574
1575 bool os::get_host_name(char* buf, size_t buflen) {
1576 DWORD size = (DWORD)buflen;
1577 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1578 }
1579
1580 void os::get_summary_os_info(char* buf, size_t buflen) {
1581 stringStream sst(buf, buflen);
1582 os::win32::print_windows_version(&sst);
1583 // chop off newline character
1584 char* nl = strchr(buf, '\n');
1585 if (nl != NULL) *nl = '\0';
1586 }
1587
1588 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1589 int ret = vsnprintf(buf, len, fmt, args);
1590 // Get the correct buffer size if buf is too small
1591 if (ret < 0) {
1592 return _vscprintf(fmt, args);
1593 }
1594 return ret;
1595 }
1596
1597 void os::print_os_info_brief(outputStream* st) {
1598 os::print_os_info(st);
1599 }
1600
1601 void os::print_os_info(outputStream* st) {
1602 #ifdef ASSERT
1603 char buffer[1024];
1604 st->print("HostName: ");
1605 if (get_host_name(buffer, sizeof(buffer))) {
1606 st->print("%s ", buffer);
1607 } else {
1608 st->print("N/A ");
1609 }
1610 #endif
1611 st->print("OS:");
1612 os::win32::print_windows_version(st);
1613 }
1614
1615 void os::win32::print_windows_version(outputStream* st) {
1616 OSVERSIONINFOEX osvi;
1617 VS_FIXEDFILEINFO *file_info;
1618 TCHAR kernel32_path[MAX_PATH];
1619 UINT len, ret;
1620
1621 // Use the GetVersionEx information to see if we're on a server or
1622 // workstation edition of Windows. Starting with Windows 8.1 we can't
1623 // trust the OS version information returned by this API.
1624 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1625 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1626 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1627 st->print_cr("Call to GetVersionEx failed");
1628 return;
1629 }
1630 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1631
1632 // Get the full path to \Windows\System32\kernel32.dll and use that for
1633 // determining what version of Windows we're running on.
1634 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1635 ret = GetSystemDirectory(kernel32_path, len);
1636 if (ret == 0 || ret > len) {
1637 st->print_cr("Call to GetSystemDirectory failed");
1638 return;
1639 }
1640 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1641
1642 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1643 if (version_size == 0) {
1644 st->print_cr("Call to GetFileVersionInfoSize failed");
1645 return;
1646 }
1647
1648 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1649 if (version_info == NULL) {
1650 st->print_cr("Failed to allocate version_info");
1651 return;
1652 }
1653
1654 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1655 os::free(version_info);
1656 st->print_cr("Call to GetFileVersionInfo failed");
1657 return;
1658 }
1659
1660 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1661 os::free(version_info);
1662 st->print_cr("Call to VerQueryValue failed");
1663 return;
1664 }
1665
1666 int major_version = HIWORD(file_info->dwProductVersionMS);
1667 int minor_version = LOWORD(file_info->dwProductVersionMS);
1668 int build_number = HIWORD(file_info->dwProductVersionLS);
1669 int build_minor = LOWORD(file_info->dwProductVersionLS);
1670 int os_vers = major_version * 1000 + minor_version;
1671 os::free(version_info);
1672
1673 st->print(" Windows ");
1674 switch (os_vers) {
1675
1676 case 6000:
1677 if (is_workstation) {
1678 st->print("Vista");
1679 } else {
1680 st->print("Server 2008");
1681 }
1682 break;
1683
1684 case 6001:
1685 if (is_workstation) {
1686 st->print("7");
1687 } else {
1688 st->print("Server 2008 R2");
1689 }
1690 break;
1691
1692 case 6002:
1693 if (is_workstation) {
1694 st->print("8");
1695 } else {
1696 st->print("Server 2012");
1697 }
1698 break;
1699
1700 case 6003:
1701 if (is_workstation) {
1702 st->print("8.1");
1703 } else {
1704 st->print("Server 2012 R2");
1705 }
1706 break;
1707
1708 case 10000:
1709 if (is_workstation) {
1710 st->print("10");
1711 } else {
1712 st->print("Server 2016");
1713 }
1714 break;
1715
1716 default:
1717 // Unrecognized windows, print out its major and minor versions
1718 st->print("%d.%d", major_version, minor_version);
1719 break;
1720 }
1721
1722 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1723 // find out whether we are running on 64 bit processor or not
1724 SYSTEM_INFO si;
1725 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1726 GetNativeSystemInfo(&si);
1727 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1728 st->print(" , 64 bit");
1729 }
1730
1731 st->print(" Build %d", build_number);
1732 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1733 st->cr();
1734 }
1735
1736 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1737 // Nothing to do for now.
1738 }
1739
1740 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1741 HKEY key;
1742 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1743 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1744 if (status == ERROR_SUCCESS) {
1745 DWORD size = (DWORD)buflen;
1746 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1747 if (status != ERROR_SUCCESS) {
1748 strncpy(buf, "## __CPU__", buflen);
1749 }
1750 RegCloseKey(key);
1751 } else {
1752 // Put generic cpu info to return
1753 strncpy(buf, "## __CPU__", buflen);
1754 }
1755 }
1756
1757 void os::print_memory_info(outputStream* st) {
1758 st->print("Memory:");
1759 st->print(" %dk page", os::vm_page_size()>>10);
1760
1761 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1762 // value if total memory is larger than 4GB
1763 MEMORYSTATUSEX ms;
1764 ms.dwLength = sizeof(ms);
1765 GlobalMemoryStatusEx(&ms);
1766
1767 st->print(", physical %uk", os::physical_memory() >> 10);
1768 st->print("(%uk free)", os::available_memory() >> 10);
1769
1770 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1771 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1772 st->cr();
1773 }
1774
1775 void os::print_siginfo(outputStream *st, const void* siginfo) {
1776 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1777 st->print("siginfo:");
1778
1779 char tmp[64];
1780 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1781 strcpy(tmp, "EXCEPTION_??");
1782 }
1783 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1784
1785 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1786 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1787 er->NumberParameters >= 2) {
1788 switch (er->ExceptionInformation[0]) {
1789 case 0: st->print(", reading address"); break;
1790 case 1: st->print(", writing address"); break;
1791 case 8: st->print(", data execution prevention violation at address"); break;
1792 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1793 er->ExceptionInformation[0]);
1794 }
1795 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1796 } else {
1797 int num = er->NumberParameters;
1798 if (num > 0) {
1799 st->print(", ExceptionInformation=");
1800 for (int i = 0; i < num; i++) {
1801 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1802 }
1803 }
1804 }
1805 st->cr();
1806 }
1807
1808 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1809 // do nothing
1810 }
1811
1812 static char saved_jvm_path[MAX_PATH] = {0};
1813
1814 // Find the full path to the current module, jvm.dll
1815 void os::jvm_path(char *buf, jint buflen) {
1816 // Error checking.
1817 if (buflen < MAX_PATH) {
1818 assert(false, "must use a large-enough buffer");
1819 buf[0] = '\0';
1820 return;
1821 }
1822 // Lazy resolve the path to current module.
1823 if (saved_jvm_path[0] != 0) {
1824 strcpy(buf, saved_jvm_path);
1825 return;
1826 }
1827
1828 buf[0] = '\0';
1829 if (Arguments::sun_java_launcher_is_altjvm()) {
1830 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1831 // for a JAVA_HOME environment variable and fix up the path so it
1832 // looks like jvm.dll is installed there (append a fake suffix
1833 // hotspot/jvm.dll).
1834 char* java_home_var = ::getenv("JAVA_HOME");
1835 if (java_home_var != NULL && java_home_var[0] != 0 &&
1836 strlen(java_home_var) < (size_t)buflen) {
1837 strncpy(buf, java_home_var, buflen);
1838
1839 // determine if this is a legacy image or modules image
1840 // modules image doesn't have "jre" subdirectory
1841 size_t len = strlen(buf);
1842 char* jrebin_p = buf + len;
1843 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1844 if (0 != _access(buf, 0)) {
1845 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1846 }
1847 len = strlen(buf);
1848 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1849 }
1850 }
1851
1852 if (buf[0] == '\0') {
1853 GetModuleFileName(vm_lib_handle, buf, buflen);
1854 }
1855 strncpy(saved_jvm_path, buf, MAX_PATH);
1856 saved_jvm_path[MAX_PATH - 1] = '\0';
1857 }
1858
1859
1860 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1861 #ifndef _WIN64
1862 st->print("_");
1863 #endif
1864 }
1865
1866
1867 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1868 #ifndef _WIN64
1869 st->print("@%d", args_size * sizeof(int));
1870 #endif
1871 }
1872
1873 // This method is a copy of JDK's sysGetLastErrorString
1874 // from src/windows/hpi/src/system_md.c
1875
1876 size_t os::lasterror(char* buf, size_t len) {
1877 DWORD errval;
1878
1879 if ((errval = GetLastError()) != 0) {
1880 // DOS error
1881 size_t n = (size_t)FormatMessage(
1882 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1883 NULL,
1884 errval,
1885 0,
1886 buf,
1887 (DWORD)len,
1888 NULL);
1889 if (n > 3) {
1890 // Drop final '.', CR, LF
1891 if (buf[n - 1] == '\n') n--;
1892 if (buf[n - 1] == '\r') n--;
1893 if (buf[n - 1] == '.') n--;
1894 buf[n] = '\0';
1895 }
1896 return n;
1897 }
1898
1899 if (errno != 0) {
1900 // C runtime error that has no corresponding DOS error code
1901 const char* s = os::strerror(errno);
1902 size_t n = strlen(s);
1903 if (n >= len) n = len - 1;
1904 strncpy(buf, s, n);
1905 buf[n] = '\0';
1906 return n;
1907 }
1908
1909 return 0;
1910 }
1911
1912 int os::get_last_error() {
1913 DWORD error = GetLastError();
1914 if (error == 0) {
1915 error = errno;
1916 }
1917 return (int)error;
1918 }
1919
1920 WindowsSemaphore::WindowsSemaphore(uint value) {
1921 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1922
1923 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1924 }
1925
1926 WindowsSemaphore::~WindowsSemaphore() {
1927 ::CloseHandle(_semaphore);
1928 }
1929
1930 void WindowsSemaphore::signal(uint count) {
1931 if (count > 0) {
1932 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1933
1934 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1935 }
1936 }
1937
1938 void WindowsSemaphore::wait() {
1939 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1940 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1941 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1942 }
1943
1944 // sun.misc.Signal
1945 // NOTE that this is a workaround for an apparent kernel bug where if
1946 // a signal handler for SIGBREAK is installed then that signal handler
1947 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1948 // See bug 4416763.
1949 static void (*sigbreakHandler)(int) = NULL;
1950
1951 static void UserHandler(int sig, void *siginfo, void *context) {
1952 os::signal_notify(sig);
1953 // We need to reinstate the signal handler each time...
1954 os::signal(sig, (void*)UserHandler);
1955 }
1956
1957 void* os::user_handler() {
1958 return (void*) UserHandler;
1959 }
1960
1961 void* os::signal(int signal_number, void* handler) {
1962 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1963 void (*oldHandler)(int) = sigbreakHandler;
1964 sigbreakHandler = (void (*)(int)) handler;
1965 return (void*) oldHandler;
1966 } else {
1967 return (void*)::signal(signal_number, (void (*)(int))handler);
1968 }
1969 }
1970
1971 void os::signal_raise(int signal_number) {
1972 raise(signal_number);
1973 }
1974
1975 // The Win32 C runtime library maps all console control events other than ^C
1976 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1977 // logoff, and shutdown events. We therefore install our own console handler
1978 // that raises SIGTERM for the latter cases.
1979 //
1980 static BOOL WINAPI consoleHandler(DWORD event) {
1981 switch (event) {
1982 case CTRL_C_EVENT:
1983 if (is_error_reported()) {
1984 // Ctrl-C is pressed during error reporting, likely because the error
1985 // handler fails to abort. Let VM die immediately.
1986 os::die();
1987 }
1988
1989 os::signal_raise(SIGINT);
1990 return TRUE;
1991 break;
1992 case CTRL_BREAK_EVENT:
1993 if (sigbreakHandler != NULL) {
1994 (*sigbreakHandler)(SIGBREAK);
1995 }
1996 return TRUE;
1997 break;
1998 case CTRL_LOGOFF_EVENT: {
1999 // Don't terminate JVM if it is running in a non-interactive session,
2000 // such as a service process.
2001 USEROBJECTFLAGS flags;
2002 HANDLE handle = GetProcessWindowStation();
2003 if (handle != NULL &&
2004 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2005 sizeof(USEROBJECTFLAGS), NULL)) {
2006 // If it is a non-interactive session, let next handler to deal
2007 // with it.
2008 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2009 return FALSE;
2010 }
2011 }
2012 }
2013 case CTRL_CLOSE_EVENT:
2014 case CTRL_SHUTDOWN_EVENT:
2015 os::signal_raise(SIGTERM);
2016 return TRUE;
2017 break;
2018 default:
2019 break;
2020 }
2021 return FALSE;
2022 }
2023
2024 // The following code is moved from os.cpp for making this
2025 // code platform specific, which it is by its very nature.
2026
2027 // Return maximum OS signal used + 1 for internal use only
2028 // Used as exit signal for signal_thread
2029 int os::sigexitnum_pd() {
2030 return NSIG;
2031 }
2032
2033 // a counter for each possible signal value, including signal_thread exit signal
2034 static volatile jint pending_signals[NSIG+1] = { 0 };
2035 static HANDLE sig_sem = NULL;
2036
2037 void os::signal_init_pd() {
2038 // Initialize signal structures
2039 memset((void*)pending_signals, 0, sizeof(pending_signals));
2040
2041 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2042
2043 // Programs embedding the VM do not want it to attempt to receive
2044 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2045 // shutdown hooks mechanism introduced in 1.3. For example, when
2046 // the VM is run as part of a Windows NT service (i.e., a servlet
2047 // engine in a web server), the correct behavior is for any console
2048 // control handler to return FALSE, not TRUE, because the OS's
2049 // "final" handler for such events allows the process to continue if
2050 // it is a service (while terminating it if it is not a service).
2051 // To make this behavior uniform and the mechanism simpler, we
2052 // completely disable the VM's usage of these console events if -Xrs
2053 // (=ReduceSignalUsage) is specified. This means, for example, that
2054 // the CTRL-BREAK thread dump mechanism is also disabled in this
2055 // case. See bugs 4323062, 4345157, and related bugs.
2056
2057 if (!ReduceSignalUsage) {
2058 // Add a CTRL-C handler
2059 SetConsoleCtrlHandler(consoleHandler, TRUE);
2060 }
2061 }
2062
2063 void os::signal_notify(int signal_number) {
2064 BOOL ret;
2065 if (sig_sem != NULL) {
2066 Atomic::inc(&pending_signals[signal_number]);
2067 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2068 assert(ret != 0, "ReleaseSemaphore() failed");
2069 }
2070 }
2071
2072 static int check_pending_signals(bool wait_for_signal) {
2073 DWORD ret;
2074 while (true) {
2075 for (int i = 0; i < NSIG + 1; i++) {
2076 jint n = pending_signals[i];
2077 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2078 return i;
2079 }
2080 }
2081 if (!wait_for_signal) {
2082 return -1;
2083 }
2084
2085 JavaThread *thread = JavaThread::current();
2086
2087 ThreadBlockInVM tbivm(thread);
2088
2089 bool threadIsSuspended;
2090 do {
2091 thread->set_suspend_equivalent();
2092 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2093 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2094 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2095
2096 // were we externally suspended while we were waiting?
2097 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2098 if (threadIsSuspended) {
2099 // The semaphore has been incremented, but while we were waiting
2100 // another thread suspended us. We don't want to continue running
2101 // while suspended because that would surprise the thread that
2102 // suspended us.
2103 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2104 assert(ret != 0, "ReleaseSemaphore() failed");
2105
2106 thread->java_suspend_self();
2107 }
2108 } while (threadIsSuspended);
2109 }
2110 }
2111
2112 int os::signal_lookup() {
2113 return check_pending_signals(false);
2114 }
2115
2116 int os::signal_wait() {
2117 return check_pending_signals(true);
2118 }
2119
2120 // Implicit OS exception handling
2121
2122 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2123 address handler) {
2124 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2125 // Save pc in thread
2126 #ifdef _M_IA64
2127 // Do not blow up if no thread info available.
2128 if (thread) {
2129 // Saving PRECISE pc (with slot information) in thread.
2130 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2131 // Convert precise PC into "Unix" format
2132 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2133 thread->set_saved_exception_pc((address)precise_pc);
2134 }
2135 // Set pc to handler
2136 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2137 // Clear out psr.ri (= Restart Instruction) in order to continue
2138 // at the beginning of the target bundle.
2139 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2140 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2141 #else
2142 #ifdef _M_AMD64
2143 // Do not blow up if no thread info available.
2144 if (thread) {
2145 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2146 }
2147 // Set pc to handler
2148 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2149 #else
2150 // Do not blow up if no thread info available.
2151 if (thread) {
2152 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2153 }
2154 // Set pc to handler
2155 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2156 #endif
2157 #endif
2158
2159 // Continue the execution
2160 return EXCEPTION_CONTINUE_EXECUTION;
2161 }
2162
2163
2164 // Used for PostMortemDump
2165 extern "C" void safepoints();
2166 extern "C" void find(int x);
2167 extern "C" void events();
2168
2169 // According to Windows API documentation, an illegal instruction sequence should generate
2170 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2171 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2172 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2173
2174 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2175
2176 // From "Execution Protection in the Windows Operating System" draft 0.35
2177 // Once a system header becomes available, the "real" define should be
2178 // included or copied here.
2179 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2180
2181 // Handle NAT Bit consumption on IA64.
2182 #ifdef _M_IA64
2183 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2184 #endif
2185
2186 // Windows Vista/2008 heap corruption check
2187 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2188
2189 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2190 // C++ compiler contain this error code. Because this is a compiler-generated
2191 // error, the code is not listed in the Win32 API header files.
2192 // The code is actually a cryptic mnemonic device, with the initial "E"
2193 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2194 // ASCII values of "msc".
2195
2196 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2197
2198 #define def_excpt(val) { #val, (val) }
2199
2200 static const struct { char* name; uint number; } exceptlabels[] = {
2201 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2202 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2203 def_excpt(EXCEPTION_BREAKPOINT),
2204 def_excpt(EXCEPTION_SINGLE_STEP),
2205 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2206 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2207 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2208 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2209 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2210 def_excpt(EXCEPTION_FLT_OVERFLOW),
2211 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2212 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2213 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2214 def_excpt(EXCEPTION_INT_OVERFLOW),
2215 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2216 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2217 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2218 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2219 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2220 def_excpt(EXCEPTION_STACK_OVERFLOW),
2221 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2222 def_excpt(EXCEPTION_GUARD_PAGE),
2223 def_excpt(EXCEPTION_INVALID_HANDLE),
2224 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2225 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2226 #ifdef _M_IA64
2227 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2228 #endif
2229 };
2230
2231 #undef def_excpt
2232
2233 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2234 uint code = static_cast<uint>(exception_code);
2235 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2236 if (exceptlabels[i].number == code) {
2237 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2238 return buf;
2239 }
2240 }
2241
2242 return NULL;
2243 }
2244
2245 //-----------------------------------------------------------------------------
2246 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2247 // handle exception caused by idiv; should only happen for -MinInt/-1
2248 // (division by zero is handled explicitly)
2249 #ifdef _M_IA64
2250 assert(0, "Fix Handle_IDiv_Exception");
2251 #else
2252 #ifdef _M_AMD64
2253 PCONTEXT ctx = exceptionInfo->ContextRecord;
2254 address pc = (address)ctx->Rip;
2255 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2256 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2257 if (pc[0] == 0xF7) {
2258 // set correct result values and continue after idiv instruction
2259 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2260 } else {
2261 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2262 }
2263 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2264 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2265 // idiv opcode (0xF7).
2266 ctx->Rdx = (DWORD)0; // remainder
2267 // Continue the execution
2268 #else
2269 PCONTEXT ctx = exceptionInfo->ContextRecord;
2270 address pc = (address)ctx->Eip;
2271 assert(pc[0] == 0xF7, "not an idiv opcode");
2272 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2273 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2274 // set correct result values and continue after idiv instruction
2275 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2276 ctx->Eax = (DWORD)min_jint; // result
2277 ctx->Edx = (DWORD)0; // remainder
2278 // Continue the execution
2279 #endif
2280 #endif
2281 return EXCEPTION_CONTINUE_EXECUTION;
2282 }
2283
2284 //-----------------------------------------------------------------------------
2285 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2286 PCONTEXT ctx = exceptionInfo->ContextRecord;
2287 #ifndef _WIN64
2288 // handle exception caused by native method modifying control word
2289 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2290
2291 switch (exception_code) {
2292 case EXCEPTION_FLT_DENORMAL_OPERAND:
2293 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2294 case EXCEPTION_FLT_INEXACT_RESULT:
2295 case EXCEPTION_FLT_INVALID_OPERATION:
2296 case EXCEPTION_FLT_OVERFLOW:
2297 case EXCEPTION_FLT_STACK_CHECK:
2298 case EXCEPTION_FLT_UNDERFLOW:
2299 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2300 if (fp_control_word != ctx->FloatSave.ControlWord) {
2301 // Restore FPCW and mask out FLT exceptions
2302 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2303 // Mask out pending FLT exceptions
2304 ctx->FloatSave.StatusWord &= 0xffffff00;
2305 return EXCEPTION_CONTINUE_EXECUTION;
2306 }
2307 }
2308
2309 if (prev_uef_handler != NULL) {
2310 // We didn't handle this exception so pass it to the previous
2311 // UnhandledExceptionFilter.
2312 return (prev_uef_handler)(exceptionInfo);
2313 }
2314 #else // !_WIN64
2315 // On Windows, the mxcsr control bits are non-volatile across calls
2316 // See also CR 6192333
2317 //
2318 jint MxCsr = INITIAL_MXCSR;
2319 // we can't use StubRoutines::addr_mxcsr_std()
2320 // because in Win64 mxcsr is not saved there
2321 if (MxCsr != ctx->MxCsr) {
2322 ctx->MxCsr = MxCsr;
2323 return EXCEPTION_CONTINUE_EXECUTION;
2324 }
2325 #endif // !_WIN64
2326
2327 return EXCEPTION_CONTINUE_SEARCH;
2328 }
2329
2330 static inline void report_error(Thread* t, DWORD exception_code,
2331 address addr, void* siginfo, void* context) {
2332 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2333
2334 // If UseOsErrorReporting, this will return here and save the error file
2335 // somewhere where we can find it in the minidump.
2336 }
2337
2338 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2339 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2340 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2341 address addr = (address) exceptionRecord->ExceptionInformation[1];
2342 if (Interpreter::contains(pc)) {
2343 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2344 if (!fr->is_first_java_frame()) {
2345 assert(fr->safe_for_sender(thread), "Safety check");
2346 *fr = fr->java_sender();
2347 }
2348 } else {
2349 // more complex code with compiled code
2350 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2351 CodeBlob* cb = CodeCache::find_blob(pc);
2352 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2353 // Not sure where the pc points to, fallback to default
2354 // stack overflow handling
2355 return false;
2356 } else {
2357 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2358 // in compiled code, the stack banging is performed just after the return pc
2359 // has been pushed on the stack
2360 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2361 if (!fr->is_java_frame()) {
2362 assert(fr->safe_for_sender(thread), "Safety check");
2363 *fr = fr->java_sender();
2364 }
2365 }
2366 }
2367 assert(fr->is_java_frame(), "Safety check");
2368 return true;
2369 }
2370
2371 //-----------------------------------------------------------------------------
2372 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2373 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2374 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2375 #ifdef _M_IA64
2376 // On Itanium, we need the "precise pc", which has the slot number coded
2377 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2378 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2379 // Convert the pc to "Unix format", which has the slot number coded
2380 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2381 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2382 // information is saved in the Unix format.
2383 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2384 #else
2385 #ifdef _M_AMD64
2386 address pc = (address) exceptionInfo->ContextRecord->Rip;
2387 #else
2388 address pc = (address) exceptionInfo->ContextRecord->Eip;
2389 #endif
2390 #endif
2391 Thread* t = Thread::current_or_null_safe();
2392
2393 // Handle SafeFetch32 and SafeFetchN exceptions.
2394 if (StubRoutines::is_safefetch_fault(pc)) {
2395 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2396 }
2397
2398 #ifndef _WIN64
2399 // Execution protection violation - win32 running on AMD64 only
2400 // Handled first to avoid misdiagnosis as a "normal" access violation;
2401 // This is safe to do because we have a new/unique ExceptionInformation
2402 // code for this condition.
2403 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2404 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2405 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2406 address addr = (address) exceptionRecord->ExceptionInformation[1];
2407
2408 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2409 int page_size = os::vm_page_size();
2410
2411 // Make sure the pc and the faulting address are sane.
2412 //
2413 // If an instruction spans a page boundary, and the page containing
2414 // the beginning of the instruction is executable but the following
2415 // page is not, the pc and the faulting address might be slightly
2416 // different - we still want to unguard the 2nd page in this case.
2417 //
2418 // 15 bytes seems to be a (very) safe value for max instruction size.
2419 bool pc_is_near_addr =
2420 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2421 bool instr_spans_page_boundary =
2422 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2423 (intptr_t) page_size) > 0);
2424
2425 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2426 static volatile address last_addr =
2427 (address) os::non_memory_address_word();
2428
2429 // In conservative mode, don't unguard unless the address is in the VM
2430 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2431 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2432
2433 // Set memory to RWX and retry
2434 address page_start =
2435 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2436 bool res = os::protect_memory((char*) page_start, page_size,
2437 os::MEM_PROT_RWX);
2438
2439 if (PrintMiscellaneous && Verbose) {
2440 char buf[256];
2441 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2442 "at " INTPTR_FORMAT
2443 ", unguarding " INTPTR_FORMAT ": %s", addr,
2444 page_start, (res ? "success" : os::strerror(errno)));
2445 tty->print_raw_cr(buf);
2446 }
2447
2448 // Set last_addr so if we fault again at the same address, we don't
2449 // end up in an endless loop.
2450 //
2451 // There are two potential complications here. Two threads trapping
2452 // at the same address at the same time could cause one of the
2453 // threads to think it already unguarded, and abort the VM. Likely
2454 // very rare.
2455 //
2456 // The other race involves two threads alternately trapping at
2457 // different addresses and failing to unguard the page, resulting in
2458 // an endless loop. This condition is probably even more unlikely
2459 // than the first.
2460 //
2461 // Although both cases could be avoided by using locks or thread
2462 // local last_addr, these solutions are unnecessary complication:
2463 // this handler is a best-effort safety net, not a complete solution.
2464 // It is disabled by default and should only be used as a workaround
2465 // in case we missed any no-execute-unsafe VM code.
2466
2467 last_addr = addr;
2468
2469 return EXCEPTION_CONTINUE_EXECUTION;
2470 }
2471 }
2472
2473 // Last unguard failed or not unguarding
2474 tty->print_raw_cr("Execution protection violation");
2475 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2476 exceptionInfo->ContextRecord);
2477 return EXCEPTION_CONTINUE_SEARCH;
2478 }
2479 }
2480 #endif // _WIN64
2481
2482 // Check to see if we caught the safepoint code in the
2483 // process of write protecting the memory serialization page.
2484 // It write enables the page immediately after protecting it
2485 // so just return.
2486 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2487 JavaThread* thread = (JavaThread*) t;
2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2489 address addr = (address) exceptionRecord->ExceptionInformation[1];
2490 if (os::is_memory_serialize_page(thread, addr)) {
2491 // Block current thread until the memory serialize page permission restored.
2492 os::block_on_serialize_page_trap();
2493 return EXCEPTION_CONTINUE_EXECUTION;
2494 }
2495 }
2496
2497 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2498 VM_Version::is_cpuinfo_segv_addr(pc)) {
2499 // Verify that OS save/restore AVX registers.
2500 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2501 }
2502
2503 if (t != NULL && t->is_Java_thread()) {
2504 JavaThread* thread = (JavaThread*) t;
2505 bool in_java = thread->thread_state() == _thread_in_Java;
2506
2507 // Handle potential stack overflows up front.
2508 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2509 #ifdef _M_IA64
2510 // Use guard page for register stack.
2511 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2512 address addr = (address) exceptionRecord->ExceptionInformation[1];
2513 // Check for a register stack overflow on Itanium
2514 if (thread->addr_inside_register_stack_red_zone(addr)) {
2515 // Fatal red zone violation happens if the Java program
2516 // catches a StackOverflow error and does so much processing
2517 // that it runs beyond the unprotected yellow guard zone. As
2518 // a result, we are out of here.
2519 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2520 } else if(thread->addr_inside_register_stack(addr)) {
2521 // Disable the yellow zone which sets the state that
2522 // we've got a stack overflow problem.
2523 if (thread->stack_yellow_reserved_zone_enabled()) {
2524 thread->disable_stack_yellow_reserved_zone();
2525 }
2526 // Give us some room to process the exception.
2527 thread->disable_register_stack_guard();
2528 // Tracing with +Verbose.
2529 if (Verbose) {
2530 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2531 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2532 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2533 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2534 thread->register_stack_base(),
2535 thread->register_stack_base() + thread->stack_size());
2536 }
2537
2538 // Reguard the permanent register stack red zone just to be sure.
2539 // We saw Windows silently disabling this without telling us.
2540 thread->enable_register_stack_red_zone();
2541
2542 return Handle_Exception(exceptionInfo,
2543 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2544 }
2545 #endif
2546 if (thread->stack_guards_enabled()) {
2547 if (_thread_in_Java) {
2548 frame fr;
2549 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2550 address addr = (address) exceptionRecord->ExceptionInformation[1];
2551 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2552 assert(fr.is_java_frame(), "Must be a Java frame");
2553 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2554 }
2555 }
2556 // Yellow zone violation. The o/s has unprotected the first yellow
2557 // zone page for us. Note: must call disable_stack_yellow_zone to
2558 // update the enabled status, even if the zone contains only one page.
2559 thread->disable_stack_yellow_reserved_zone();
2560 // If not in java code, return and hope for the best.
2561 return in_java
2562 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2563 : EXCEPTION_CONTINUE_EXECUTION;
2564 } else {
2565 // Fatal red zone violation.
2566 thread->disable_stack_red_zone();
2567 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2568 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2569 exceptionInfo->ContextRecord);
2570 return EXCEPTION_CONTINUE_SEARCH;
2571 }
2572 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2573 // Either stack overflow or null pointer exception.
2574 if (in_java) {
2575 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2576 address addr = (address) exceptionRecord->ExceptionInformation[1];
2577 address stack_end = thread->stack_end();
2578 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2579 // Stack overflow.
2580 assert(!os::uses_stack_guard_pages(),
2581 "should be caught by red zone code above.");
2582 return Handle_Exception(exceptionInfo,
2583 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2584 }
2585 // Check for safepoint polling and implicit null
2586 // We only expect null pointers in the stubs (vtable)
2587 // the rest are checked explicitly now.
2588 CodeBlob* cb = CodeCache::find_blob(pc);
2589 if (cb != NULL) {
2590 if (os::is_poll_address(addr)) {
2591 address stub = SharedRuntime::get_poll_stub(pc);
2592 return Handle_Exception(exceptionInfo, stub);
2593 }
2594 }
2595 {
2596 #ifdef _WIN64
2597 // If it's a legal stack address map the entire region in
2598 //
2599 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2600 address addr = (address) exceptionRecord->ExceptionInformation[1];
2601 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2602 addr = (address)((uintptr_t)addr &
2603 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2604 os::commit_memory((char *)addr, thread->stack_base() - addr,
2605 !ExecMem);
2606 return EXCEPTION_CONTINUE_EXECUTION;
2607 } else
2608 #endif
2609 {
2610 // Null pointer exception.
2611 #ifdef _M_IA64
2612 // Process implicit null checks in compiled code. Note: Implicit null checks
2613 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2614 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2615 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2616 // Handle implicit null check in UEP method entry
2617 if (cb && (cb->is_frame_complete_at(pc) ||
2618 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2619 if (Verbose) {
2620 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2621 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2622 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2623 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2624 *(bundle_start + 1), *bundle_start);
2625 }
2626 return Handle_Exception(exceptionInfo,
2627 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2628 }
2629 }
2630
2631 // Implicit null checks were processed above. Hence, we should not reach
2632 // here in the usual case => die!
2633 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2634 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2635 exceptionInfo->ContextRecord);
2636 return EXCEPTION_CONTINUE_SEARCH;
2637
2638 #else // !IA64
2639
2640 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2641 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2642 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2643 }
2644 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2645 exceptionInfo->ContextRecord);
2646 return EXCEPTION_CONTINUE_SEARCH;
2647 #endif
2648 }
2649 }
2650 }
2651
2652 #ifdef _WIN64
2653 // Special care for fast JNI field accessors.
2654 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2655 // in and the heap gets shrunk before the field access.
2656 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2657 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2658 if (addr != (address)-1) {
2659 return Handle_Exception(exceptionInfo, addr);
2660 }
2661 }
2662 #endif
2663
2664 // Stack overflow or null pointer exception in native code.
2665 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2666 exceptionInfo->ContextRecord);
2667 return EXCEPTION_CONTINUE_SEARCH;
2668 } // /EXCEPTION_ACCESS_VIOLATION
2669 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2670 #if defined _M_IA64
2671 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2672 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2673 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2674
2675 // Compiled method patched to be non entrant? Following conditions must apply:
2676 // 1. must be first instruction in bundle
2677 // 2. must be a break instruction with appropriate code
2678 if ((((uint64_t) pc & 0x0F) == 0) &&
2679 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2680 return Handle_Exception(exceptionInfo,
2681 (address)SharedRuntime::get_handle_wrong_method_stub());
2682 }
2683 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2684 #endif
2685
2686
2687 if (in_java) {
2688 switch (exception_code) {
2689 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2690 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2691
2692 case EXCEPTION_INT_OVERFLOW:
2693 return Handle_IDiv_Exception(exceptionInfo);
2694
2695 } // switch
2696 }
2697 if (((thread->thread_state() == _thread_in_Java) ||
2698 (thread->thread_state() == _thread_in_native)) &&
2699 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2700 LONG result=Handle_FLT_Exception(exceptionInfo);
2701 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2702 }
2703 }
2704
2705 if (exception_code != EXCEPTION_BREAKPOINT) {
2706 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2707 exceptionInfo->ContextRecord);
2708 }
2709 return EXCEPTION_CONTINUE_SEARCH;
2710 }
2711
2712 #ifndef _WIN64
2713 // Special care for fast JNI accessors.
2714 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2715 // the heap gets shrunk before the field access.
2716 // Need to install our own structured exception handler since native code may
2717 // install its own.
2718 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2719 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2720 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2721 address pc = (address) exceptionInfo->ContextRecord->Eip;
2722 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2723 if (addr != (address)-1) {
2724 return Handle_Exception(exceptionInfo, addr);
2725 }
2726 }
2727 return EXCEPTION_CONTINUE_SEARCH;
2728 }
2729
2730 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2731 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2732 jobject obj, \
2733 jfieldID fieldID) { \
2734 __try { \
2735 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2736 obj, \
2737 fieldID); \
2738 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2739 _exception_info())) { \
2740 } \
2741 return 0; \
2742 }
2743
2744 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2745 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2746 DEFINE_FAST_GETFIELD(jchar, char, Char)
2747 DEFINE_FAST_GETFIELD(jshort, short, Short)
2748 DEFINE_FAST_GETFIELD(jint, int, Int)
2749 DEFINE_FAST_GETFIELD(jlong, long, Long)
2750 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2751 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2752
2753 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2754 switch (type) {
2755 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2756 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2757 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2758 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2759 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2760 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2761 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2762 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2763 default: ShouldNotReachHere();
2764 }
2765 return (address)-1;
2766 }
2767 #endif
2768
2769 // Virtual Memory
2770
2771 int os::vm_page_size() { return os::win32::vm_page_size(); }
2772 int os::vm_allocation_granularity() {
2773 return os::win32::vm_allocation_granularity();
2774 }
2775
2776 // Windows large page support is available on Windows 2003. In order to use
2777 // large page memory, the administrator must first assign additional privilege
2778 // to the user:
2779 // + select Control Panel -> Administrative Tools -> Local Security Policy
2780 // + select Local Policies -> User Rights Assignment
2781 // + double click "Lock pages in memory", add users and/or groups
2782 // + reboot
2783 // Note the above steps are needed for administrator as well, as administrators
2784 // by default do not have the privilege to lock pages in memory.
2785 //
2786 // Note about Windows 2003: although the API supports committing large page
2787 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2788 // scenario, I found through experiment it only uses large page if the entire
2789 // memory region is reserved and committed in a single VirtualAlloc() call.
2790 // This makes Windows large page support more or less like Solaris ISM, in
2791 // that the entire heap must be committed upfront. This probably will change
2792 // in the future, if so the code below needs to be revisited.
2793
2794 #ifndef MEM_LARGE_PAGES
2795 #define MEM_LARGE_PAGES 0x20000000
2796 #endif
2797
2798 static HANDLE _hProcess;
2799 static HANDLE _hToken;
2800
2801 // Container for NUMA node list info
2802 class NUMANodeListHolder {
2803 private:
2804 int *_numa_used_node_list; // allocated below
2805 int _numa_used_node_count;
2806
2807 void free_node_list() {
2808 if (_numa_used_node_list != NULL) {
2809 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2810 }
2811 }
2812
2813 public:
2814 NUMANodeListHolder() {
2815 _numa_used_node_count = 0;
2816 _numa_used_node_list = NULL;
2817 // do rest of initialization in build routine (after function pointers are set up)
2818 }
2819
2820 ~NUMANodeListHolder() {
2821 free_node_list();
2822 }
2823
2824 bool build() {
2825 DWORD_PTR proc_aff_mask;
2826 DWORD_PTR sys_aff_mask;
2827 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2828 ULONG highest_node_number;
2829 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2830 free_node_list();
2831 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2832 for (unsigned int i = 0; i <= highest_node_number; i++) {
2833 ULONGLONG proc_mask_numa_node;
2834 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2835 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2836 _numa_used_node_list[_numa_used_node_count++] = i;
2837 }
2838 }
2839 return (_numa_used_node_count > 1);
2840 }
2841
2842 int get_count() { return _numa_used_node_count; }
2843 int get_node_list_entry(int n) {
2844 // for indexes out of range, returns -1
2845 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2846 }
2847
2848 } numa_node_list_holder;
2849
2850
2851
2852 static size_t _large_page_size = 0;
2853
2854 static bool request_lock_memory_privilege() {
2855 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2856 os::current_process_id());
2857
2858 LUID luid;
2859 if (_hProcess != NULL &&
2860 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2861 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2862
2863 TOKEN_PRIVILEGES tp;
2864 tp.PrivilegeCount = 1;
2865 tp.Privileges[0].Luid = luid;
2866 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2867
2868 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2869 // privilege. Check GetLastError() too. See MSDN document.
2870 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2871 (GetLastError() == ERROR_SUCCESS)) {
2872 return true;
2873 }
2874 }
2875
2876 return false;
2877 }
2878
2879 static void cleanup_after_large_page_init() {
2880 if (_hProcess) CloseHandle(_hProcess);
2881 _hProcess = NULL;
2882 if (_hToken) CloseHandle(_hToken);
2883 _hToken = NULL;
2884 }
2885
2886 static bool numa_interleaving_init() {
2887 bool success = false;
2888 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2889
2890 // print a warning if UseNUMAInterleaving flag is specified on command line
2891 bool warn_on_failure = use_numa_interleaving_specified;
2892 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2893
2894 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2895 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2896 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2897
2898 if (numa_node_list_holder.build()) {
2899 if (PrintMiscellaneous && Verbose) {
2900 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2901 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2902 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2903 }
2904 tty->print("\n");
2905 }
2906 success = true;
2907 } else {
2908 WARN("Process does not cover multiple NUMA nodes.");
2909 }
2910 if (!success) {
2911 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2912 }
2913 return success;
2914 #undef WARN
2915 }
2916
2917 // this routine is used whenever we need to reserve a contiguous VA range
2918 // but we need to make separate VirtualAlloc calls for each piece of the range
2919 // Reasons for doing this:
2920 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2921 // * UseNUMAInterleaving requires a separate node for each piece
2922 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2923 DWORD prot,
2924 bool should_inject_error = false) {
2925 char * p_buf;
2926 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2927 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2928 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2929
2930 // first reserve enough address space in advance since we want to be
2931 // able to break a single contiguous virtual address range into multiple
2932 // large page commits but WS2003 does not allow reserving large page space
2933 // so we just use 4K pages for reserve, this gives us a legal contiguous
2934 // address space. then we will deallocate that reservation, and re alloc
2935 // using large pages
2936 const size_t size_of_reserve = bytes + chunk_size;
2937 if (bytes > size_of_reserve) {
2938 // Overflowed.
2939 return NULL;
2940 }
2941 p_buf = (char *) VirtualAlloc(addr,
2942 size_of_reserve, // size of Reserve
2943 MEM_RESERVE,
2944 PAGE_READWRITE);
2945 // If reservation failed, return NULL
2946 if (p_buf == NULL) return NULL;
2947 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2948 os::release_memory(p_buf, bytes + chunk_size);
2949
2950 // we still need to round up to a page boundary (in case we are using large pages)
2951 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2952 // instead we handle this in the bytes_to_rq computation below
2953 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2954
2955 // now go through and allocate one chunk at a time until all bytes are
2956 // allocated
2957 size_t bytes_remaining = bytes;
2958 // An overflow of align_size_up() would have been caught above
2959 // in the calculation of size_of_reserve.
2960 char * next_alloc_addr = p_buf;
2961 HANDLE hProc = GetCurrentProcess();
2962
2963 #ifdef ASSERT
2964 // Variable for the failure injection
2965 long ran_num = os::random();
2966 size_t fail_after = ran_num % bytes;
2967 #endif
2968
2969 int count=0;
2970 while (bytes_remaining) {
2971 // select bytes_to_rq to get to the next chunk_size boundary
2972
2973 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2974 // Note allocate and commit
2975 char * p_new;
2976
2977 #ifdef ASSERT
2978 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2979 #else
2980 const bool inject_error_now = false;
2981 #endif
2982
2983 if (inject_error_now) {
2984 p_new = NULL;
2985 } else {
2986 if (!UseNUMAInterleaving) {
2987 p_new = (char *) VirtualAlloc(next_alloc_addr,
2988 bytes_to_rq,
2989 flags,
2990 prot);
2991 } else {
2992 // get the next node to use from the used_node_list
2993 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2994 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2995 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2996 }
2997 }
2998
2999 if (p_new == NULL) {
3000 // Free any allocated pages
3001 if (next_alloc_addr > p_buf) {
3002 // Some memory was committed so release it.
3003 size_t bytes_to_release = bytes - bytes_remaining;
3004 // NMT has yet to record any individual blocks, so it
3005 // need to create a dummy 'reserve' record to match
3006 // the release.
3007 MemTracker::record_virtual_memory_reserve((address)p_buf,
3008 bytes_to_release, CALLER_PC);
3009 os::release_memory(p_buf, bytes_to_release);
3010 }
3011 #ifdef ASSERT
3012 if (should_inject_error) {
3013 if (TracePageSizes && Verbose) {
3014 tty->print_cr("Reserving pages individually failed.");
3015 }
3016 }
3017 #endif
3018 return NULL;
3019 }
3020
3021 bytes_remaining -= bytes_to_rq;
3022 next_alloc_addr += bytes_to_rq;
3023 count++;
3024 }
3025 // Although the memory is allocated individually, it is returned as one.
3026 // NMT records it as one block.
3027 if ((flags & MEM_COMMIT) != 0) {
3028 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3029 } else {
3030 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3031 }
3032
3033 // made it this far, success
3034 return p_buf;
3035 }
3036
3037
3038
3039 void os::large_page_init() {
3040 if (!UseLargePages) return;
3041
3042 // print a warning if any large page related flag is specified on command line
3043 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3044 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3045 bool success = false;
3046
3047 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3048 if (request_lock_memory_privilege()) {
3049 size_t s = GetLargePageMinimum();
3050 if (s) {
3051 #if defined(IA32) || defined(AMD64)
3052 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3053 WARN("JVM cannot use large pages bigger than 4mb.");
3054 } else {
3055 #endif
3056 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3057 _large_page_size = LargePageSizeInBytes;
3058 } else {
3059 _large_page_size = s;
3060 }
3061 success = true;
3062 #if defined(IA32) || defined(AMD64)
3063 }
3064 #endif
3065 } else {
3066 WARN("Large page is not supported by the processor.");
3067 }
3068 } else {
3069 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3070 }
3071 #undef WARN
3072
3073 const size_t default_page_size = (size_t) vm_page_size();
3074 if (success && _large_page_size > default_page_size) {
3075 _page_sizes[0] = _large_page_size;
3076 _page_sizes[1] = default_page_size;
3077 _page_sizes[2] = 0;
3078 }
3079
3080 cleanup_after_large_page_init();
3081 UseLargePages = success;
3082 }
3083
3084 // On win32, one cannot release just a part of reserved memory, it's an
3085 // all or nothing deal. When we split a reservation, we must break the
3086 // reservation into two reservations.
3087 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3088 bool realloc) {
3089 if (size > 0) {
3090 release_memory(base, size);
3091 if (realloc) {
3092 reserve_memory(split, base);
3093 }
3094 if (size != split) {
3095 reserve_memory(size - split, base + split);
3096 }
3097 }
3098 }
3099
3100 // Multiple threads can race in this code but it's not possible to unmap small sections of
3101 // virtual space to get requested alignment, like posix-like os's.
3102 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3103 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3104 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3105 "Alignment must be a multiple of allocation granularity (page size)");
3106 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3107
3108 size_t extra_size = size + alignment;
3109 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3110
3111 char* aligned_base = NULL;
3112
3113 do {
3114 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3115 if (extra_base == NULL) {
3116 return NULL;
3117 }
3118 // Do manual alignment
3119 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3120
3121 os::release_memory(extra_base, extra_size);
3122
3123 aligned_base = os::reserve_memory(size, aligned_base);
3124
3125 } while (aligned_base == NULL);
3126
3127 return aligned_base;
3128 }
3129
3130 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3131 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3132 "reserve alignment");
3133 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3134 char* res;
3135 // note that if UseLargePages is on, all the areas that require interleaving
3136 // will go thru reserve_memory_special rather than thru here.
3137 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3138 if (!use_individual) {
3139 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3140 } else {
3141 elapsedTimer reserveTimer;
3142 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3143 // in numa interleaving, we have to allocate pages individually
3144 // (well really chunks of NUMAInterleaveGranularity size)
3145 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3146 if (res == NULL) {
3147 warning("NUMA page allocation failed");
3148 }
3149 if (Verbose && PrintMiscellaneous) {
3150 reserveTimer.stop();
3151 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3152 reserveTimer.milliseconds(), reserveTimer.ticks());
3153 }
3154 }
3155 assert(res == NULL || addr == NULL || addr == res,
3156 "Unexpected address from reserve.");
3157
3158 return res;
3159 }
3160
3161 // Reserve memory at an arbitrary address, only if that area is
3162 // available (and not reserved for something else).
3163 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3164 // Windows os::reserve_memory() fails of the requested address range is
3165 // not avilable.
3166 return reserve_memory(bytes, requested_addr);
3167 }
3168
3169 size_t os::large_page_size() {
3170 return _large_page_size;
3171 }
3172
3173 bool os::can_commit_large_page_memory() {
3174 // Windows only uses large page memory when the entire region is reserved
3175 // and committed in a single VirtualAlloc() call. This may change in the
3176 // future, but with Windows 2003 it's not possible to commit on demand.
3177 return false;
3178 }
3179
3180 bool os::can_execute_large_page_memory() {
3181 return true;
3182 }
3183
3184 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3185 bool exec) {
3186 assert(UseLargePages, "only for large pages");
3187
3188 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3189 return NULL; // Fallback to small pages.
3190 }
3191
3192 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3193 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3194
3195 // with large pages, there are two cases where we need to use Individual Allocation
3196 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3197 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3198 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3199 if (TracePageSizes && Verbose) {
3200 tty->print_cr("Reserving large pages individually.");
3201 }
3202 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3203 if (p_buf == NULL) {
3204 // give an appropriate warning message
3205 if (UseNUMAInterleaving) {
3206 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3207 }
3208 if (UseLargePagesIndividualAllocation) {
3209 warning("Individually allocated large pages failed, "
3210 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3211 }
3212 return NULL;
3213 }
3214
3215 return p_buf;
3216
3217 } else {
3218 if (TracePageSizes && Verbose) {
3219 tty->print_cr("Reserving large pages in a single large chunk.");
3220 }
3221 // normal policy just allocate it all at once
3222 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3223 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3224 if (res != NULL) {
3225 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3226 }
3227
3228 return res;
3229 }
3230 }
3231
3232 bool os::release_memory_special(char* base, size_t bytes) {
3233 assert(base != NULL, "Sanity check");
3234 return release_memory(base, bytes);
3235 }
3236
3237 void os::print_statistics() {
3238 }
3239
3240 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3241 int err = os::get_last_error();
3242 char buf[256];
3243 size_t buf_len = os::lasterror(buf, sizeof(buf));
3244 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3245 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3246 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3247 }
3248
3249 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3250 if (bytes == 0) {
3251 // Don't bother the OS with noops.
3252 return true;
3253 }
3254 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3255 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3256 // Don't attempt to print anything if the OS call fails. We're
3257 // probably low on resources, so the print itself may cause crashes.
3258
3259 // unless we have NUMAInterleaving enabled, the range of a commit
3260 // is always within a reserve covered by a single VirtualAlloc
3261 // in that case we can just do a single commit for the requested size
3262 if (!UseNUMAInterleaving) {
3263 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3264 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3265 return false;
3266 }
3267 if (exec) {
3268 DWORD oldprot;
3269 // Windows doc says to use VirtualProtect to get execute permissions
3270 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3271 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3272 return false;
3273 }
3274 }
3275 return true;
3276 } else {
3277
3278 // when NUMAInterleaving is enabled, the commit might cover a range that
3279 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3280 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3281 // returns represents the number of bytes that can be committed in one step.
3282 size_t bytes_remaining = bytes;
3283 char * next_alloc_addr = addr;
3284 while (bytes_remaining > 0) {
3285 MEMORY_BASIC_INFORMATION alloc_info;
3286 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3287 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3288 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3289 PAGE_READWRITE) == NULL) {
3290 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3291 exec);)
3292 return false;
3293 }
3294 if (exec) {
3295 DWORD oldprot;
3296 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3297 PAGE_EXECUTE_READWRITE, &oldprot)) {
3298 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3299 exec);)
3300 return false;
3301 }
3302 }
3303 bytes_remaining -= bytes_to_rq;
3304 next_alloc_addr += bytes_to_rq;
3305 }
3306 }
3307 // if we made it this far, return true
3308 return true;
3309 }
3310
3311 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3312 bool exec) {
3313 // alignment_hint is ignored on this OS
3314 return pd_commit_memory(addr, size, exec);
3315 }
3316
3317 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3318 const char* mesg) {
3319 assert(mesg != NULL, "mesg must be specified");
3320 if (!pd_commit_memory(addr, size, exec)) {
3321 warn_fail_commit_memory(addr, size, exec);
3322 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3323 }
3324 }
3325
3326 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3327 size_t alignment_hint, bool exec,
3328 const char* mesg) {
3329 // alignment_hint is ignored on this OS
3330 pd_commit_memory_or_exit(addr, size, exec, mesg);
3331 }
3332
3333 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3334 if (bytes == 0) {
3335 // Don't bother the OS with noops.
3336 return true;
3337 }
3338 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3339 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3340 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3341 }
3342
3343 bool os::pd_release_memory(char* addr, size_t bytes) {
3344 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3345 }
3346
3347 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3348 return os::commit_memory(addr, size, !ExecMem);
3349 }
3350
3351 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3352 return os::uncommit_memory(addr, size);
3353 }
3354
3355 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3356 uint count = 0;
3357 bool ret = false;
3358 size_t bytes_remaining = bytes;
3359 char * next_protect_addr = addr;
3360
3361 // Use VirtualQuery() to get the chunk size.
3362 while (bytes_remaining) {
3363 MEMORY_BASIC_INFORMATION alloc_info;
3364 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3365 return false;
3366 }
3367
3368 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3369 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3370 // but we don't distinguish here as both cases are protected by same API.
3371 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3372 warning("Failed protecting pages individually for chunk #%u", count);
3373 if (!ret) {
3374 return false;
3375 }
3376
3377 bytes_remaining -= bytes_to_protect;
3378 next_protect_addr += bytes_to_protect;
3379 count++;
3380 }
3381 return ret;
3382 }
3383
3384 // Set protections specified
3385 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3386 bool is_committed) {
3387 unsigned int p = 0;
3388 switch (prot) {
3389 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3390 case MEM_PROT_READ: p = PAGE_READONLY; break;
3391 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3392 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3393 default:
3394 ShouldNotReachHere();
3395 }
3396
3397 DWORD old_status;
3398
3399 // Strange enough, but on Win32 one can change protection only for committed
3400 // memory, not a big deal anyway, as bytes less or equal than 64K
3401 if (!is_committed) {
3402 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3403 "cannot commit protection page");
3404 }
3405 // One cannot use os::guard_memory() here, as on Win32 guard page
3406 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3407 //
3408 // Pages in the region become guard pages. Any attempt to access a guard page
3409 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3410 // the guard page status. Guard pages thus act as a one-time access alarm.
3411 bool ret;
3412 if (UseNUMAInterleaving) {
3413 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3414 // so we must protect the chunks individually.
3415 ret = protect_pages_individually(addr, bytes, p, &old_status);
3416 } else {
3417 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3418 }
3419 #ifdef ASSERT
3420 if (!ret) {
3421 int err = os::get_last_error();
3422 char buf[256];
3423 size_t buf_len = os::lasterror(buf, sizeof(buf));
3424 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3425 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3426 buf_len != 0 ? buf : "<no_error_string>", err);
3427 }
3428 #endif
3429 return ret;
3430 }
3431
3432 bool os::guard_memory(char* addr, size_t bytes) {
3433 DWORD old_status;
3434 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3435 }
3436
3437 bool os::unguard_memory(char* addr, size_t bytes) {
3438 DWORD old_status;
3439 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3440 }
3441
3442 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3443 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3444 void os::numa_make_global(char *addr, size_t bytes) { }
3445 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3446 bool os::numa_topology_changed() { return false; }
3447 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3448 int os::numa_get_group_id() { return 0; }
3449 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3450 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3451 // Provide an answer for UMA systems
3452 ids[0] = 0;
3453 return 1;
3454 } else {
3455 // check for size bigger than actual groups_num
3456 size = MIN2(size, numa_get_groups_num());
3457 for (int i = 0; i < (int)size; i++) {
3458 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3459 }
3460 return size;
3461 }
3462 }
3463
3464 bool os::get_page_info(char *start, page_info* info) {
3465 return false;
3466 }
3467
3468 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3469 page_info* page_found) {
3470 return end;
3471 }
3472
3473 char* os::non_memory_address_word() {
3474 // Must never look like an address returned by reserve_memory,
3475 // even in its subfields (as defined by the CPU immediate fields,
3476 // if the CPU splits constants across multiple instructions).
3477 return (char*)-1;
3478 }
3479
3480 #define MAX_ERROR_COUNT 100
3481 #define SYS_THREAD_ERROR 0xffffffffUL
3482
3483 void os::pd_start_thread(Thread* thread) {
3484 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3485 // Returns previous suspend state:
3486 // 0: Thread was not suspended
3487 // 1: Thread is running now
3488 // >1: Thread is still suspended.
3489 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3490 }
3491
3492 class HighResolutionInterval : public CHeapObj<mtThread> {
3493 // The default timer resolution seems to be 10 milliseconds.
3494 // (Where is this written down?)
3495 // If someone wants to sleep for only a fraction of the default,
3496 // then we set the timer resolution down to 1 millisecond for
3497 // the duration of their interval.
3498 // We carefully set the resolution back, since otherwise we
3499 // seem to incur an overhead (3%?) that we don't need.
3500 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3501 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3502 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3503 // timeBeginPeriod() if the relative error exceeded some threshold.
3504 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3505 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3506 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3507 // resolution timers running.
3508 private:
3509 jlong resolution;
3510 public:
3511 HighResolutionInterval(jlong ms) {
3512 resolution = ms % 10L;
3513 if (resolution != 0) {
3514 MMRESULT result = timeBeginPeriod(1L);
3515 }
3516 }
3517 ~HighResolutionInterval() {
3518 if (resolution != 0) {
3519 MMRESULT result = timeEndPeriod(1L);
3520 }
3521 resolution = 0L;
3522 }
3523 };
3524
3525 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3526 jlong limit = (jlong) MAXDWORD;
3527
3528 while (ms > limit) {
3529 int res;
3530 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3531 return res;
3532 }
3533 ms -= limit;
3534 }
3535
3536 assert(thread == Thread::current(), "thread consistency check");
3537 OSThread* osthread = thread->osthread();
3538 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3539 int result;
3540 if (interruptable) {
3541 assert(thread->is_Java_thread(), "must be java thread");
3542 JavaThread *jt = (JavaThread *) thread;
3543 ThreadBlockInVM tbivm(jt);
3544
3545 jt->set_suspend_equivalent();
3546 // cleared by handle_special_suspend_equivalent_condition() or
3547 // java_suspend_self() via check_and_wait_while_suspended()
3548
3549 HANDLE events[1];
3550 events[0] = osthread->interrupt_event();
3551 HighResolutionInterval *phri=NULL;
3552 if (!ForceTimeHighResolution) {
3553 phri = new HighResolutionInterval(ms);
3554 }
3555 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3556 result = OS_TIMEOUT;
3557 } else {
3558 ResetEvent(osthread->interrupt_event());
3559 osthread->set_interrupted(false);
3560 result = OS_INTRPT;
3561 }
3562 delete phri; //if it is NULL, harmless
3563
3564 // were we externally suspended while we were waiting?
3565 jt->check_and_wait_while_suspended();
3566 } else {
3567 assert(!thread->is_Java_thread(), "must not be java thread");
3568 Sleep((long) ms);
3569 result = OS_TIMEOUT;
3570 }
3571 return result;
3572 }
3573
3574 // Short sleep, direct OS call.
3575 //
3576 // ms = 0, means allow others (if any) to run.
3577 //
3578 void os::naked_short_sleep(jlong ms) {
3579 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3580 Sleep(ms);
3581 }
3582
3583 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3584 void os::infinite_sleep() {
3585 while (true) { // sleep forever ...
3586 Sleep(100000); // ... 100 seconds at a time
3587 }
3588 }
3589
3590 typedef BOOL (WINAPI * STTSignature)(void);
3591
3592 void os::naked_yield() {
3593 // Consider passing back the return value from SwitchToThread().
3594 SwitchToThread();
3595 }
3596
3597 // Win32 only gives you access to seven real priorities at a time,
3598 // so we compress Java's ten down to seven. It would be better
3599 // if we dynamically adjusted relative priorities.
3600
3601 int os::java_to_os_priority[CriticalPriority + 1] = {
3602 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3603 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3604 THREAD_PRIORITY_LOWEST, // 2
3605 THREAD_PRIORITY_BELOW_NORMAL, // 3
3606 THREAD_PRIORITY_BELOW_NORMAL, // 4
3607 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3608 THREAD_PRIORITY_NORMAL, // 6
3609 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3610 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3611 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3612 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3613 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3614 };
3615
3616 int prio_policy1[CriticalPriority + 1] = {
3617 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3618 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3619 THREAD_PRIORITY_LOWEST, // 2
3620 THREAD_PRIORITY_BELOW_NORMAL, // 3
3621 THREAD_PRIORITY_BELOW_NORMAL, // 4
3622 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3623 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3624 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3625 THREAD_PRIORITY_HIGHEST, // 8
3626 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3627 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3628 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3629 };
3630
3631 static int prio_init() {
3632 // If ThreadPriorityPolicy is 1, switch tables
3633 if (ThreadPriorityPolicy == 1) {
3634 int i;
3635 for (i = 0; i < CriticalPriority + 1; i++) {
3636 os::java_to_os_priority[i] = prio_policy1[i];
3637 }
3638 }
3639 if (UseCriticalJavaThreadPriority) {
3640 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3641 }
3642 return 0;
3643 }
3644
3645 OSReturn os::set_native_priority(Thread* thread, int priority) {
3646 if (!UseThreadPriorities) return OS_OK;
3647 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3648 return ret ? OS_OK : OS_ERR;
3649 }
3650
3651 OSReturn os::get_native_priority(const Thread* const thread,
3652 int* priority_ptr) {
3653 if (!UseThreadPriorities) {
3654 *priority_ptr = java_to_os_priority[NormPriority];
3655 return OS_OK;
3656 }
3657 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3658 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3659 assert(false, "GetThreadPriority failed");
3660 return OS_ERR;
3661 }
3662 *priority_ptr = os_prio;
3663 return OS_OK;
3664 }
3665
3666
3667 // Hint to the underlying OS that a task switch would not be good.
3668 // Void return because it's a hint and can fail.
3669 void os::hint_no_preempt() {}
3670
3671 void os::interrupt(Thread* thread) {
3672 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3673 Threads_lock->owned_by_self(),
3674 "possibility of dangling Thread pointer");
3675
3676 OSThread* osthread = thread->osthread();
3677 osthread->set_interrupted(true);
3678 // More than one thread can get here with the same value of osthread,
3679 // resulting in multiple notifications. We do, however, want the store
3680 // to interrupted() to be visible to other threads before we post
3681 // the interrupt event.
3682 OrderAccess::release();
3683 SetEvent(osthread->interrupt_event());
3684 // For JSR166: unpark after setting status
3685 if (thread->is_Java_thread()) {
3686 ((JavaThread*)thread)->parker()->unpark();
3687 }
3688
3689 ParkEvent * ev = thread->_ParkEvent;
3690 if (ev != NULL) ev->unpark();
3691 }
3692
3693
3694 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3695 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3696 "possibility of dangling Thread pointer");
3697
3698 OSThread* osthread = thread->osthread();
3699 // There is no synchronization between the setting of the interrupt
3700 // and it being cleared here. It is critical - see 6535709 - that
3701 // we only clear the interrupt state, and reset the interrupt event,
3702 // if we are going to report that we were indeed interrupted - else
3703 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3704 // depending on the timing. By checking thread interrupt event to see
3705 // if the thread gets real interrupt thus prevent spurious wakeup.
3706 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3707 if (interrupted && clear_interrupted) {
3708 osthread->set_interrupted(false);
3709 ResetEvent(osthread->interrupt_event());
3710 } // Otherwise leave the interrupted state alone
3711
3712 return interrupted;
3713 }
3714
3715 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3716 ExtendedPC os::get_thread_pc(Thread* thread) {
3717 CONTEXT context;
3718 context.ContextFlags = CONTEXT_CONTROL;
3719 HANDLE handle = thread->osthread()->thread_handle();
3720 #ifdef _M_IA64
3721 assert(0, "Fix get_thread_pc");
3722 return ExtendedPC(NULL);
3723 #else
3724 if (GetThreadContext(handle, &context)) {
3725 #ifdef _M_AMD64
3726 return ExtendedPC((address) context.Rip);
3727 #else
3728 return ExtendedPC((address) context.Eip);
3729 #endif
3730 } else {
3731 return ExtendedPC(NULL);
3732 }
3733 #endif
3734 }
3735
3736 // GetCurrentThreadId() returns DWORD
3737 intx os::current_thread_id() { return GetCurrentThreadId(); }
3738
3739 static int _initial_pid = 0;
3740
3741 int os::current_process_id() {
3742 return (_initial_pid ? _initial_pid : _getpid());
3743 }
3744
3745 int os::win32::_vm_page_size = 0;
3746 int os::win32::_vm_allocation_granularity = 0;
3747 int os::win32::_processor_type = 0;
3748 // Processor level is not available on non-NT systems, use vm_version instead
3749 int os::win32::_processor_level = 0;
3750 julong os::win32::_physical_memory = 0;
3751 size_t os::win32::_default_stack_size = 0;
3752
3753 intx os::win32::_os_thread_limit = 0;
3754 volatile intx os::win32::_os_thread_count = 0;
3755
3756 bool os::win32::_is_windows_server = false;
3757
3758 // 6573254
3759 // Currently, the bug is observed across all the supported Windows releases,
3760 // including the latest one (as of this writing - Windows Server 2012 R2)
3761 bool os::win32::_has_exit_bug = true;
3762
3763 void os::win32::initialize_system_info() {
3764 SYSTEM_INFO si;
3765 GetSystemInfo(&si);
3766 _vm_page_size = si.dwPageSize;
3767 _vm_allocation_granularity = si.dwAllocationGranularity;
3768 _processor_type = si.dwProcessorType;
3769 _processor_level = si.wProcessorLevel;
3770 set_processor_count(si.dwNumberOfProcessors);
3771
3772 MEMORYSTATUSEX ms;
3773 ms.dwLength = sizeof(ms);
3774
3775 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3776 // dwMemoryLoad (% of memory in use)
3777 GlobalMemoryStatusEx(&ms);
3778 _physical_memory = ms.ullTotalPhys;
3779
3780 OSVERSIONINFOEX oi;
3781 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3782 GetVersionEx((OSVERSIONINFO*)&oi);
3783 switch (oi.dwPlatformId) {
3784 case VER_PLATFORM_WIN32_NT:
3785 {
3786 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3787 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3788 oi.wProductType == VER_NT_SERVER) {
3789 _is_windows_server = true;
3790 }
3791 }
3792 break;
3793 default: fatal("Unknown platform");
3794 }
3795
3796 _default_stack_size = os::current_stack_size();
3797 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3798 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3799 "stack size not a multiple of page size");
3800
3801 initialize_performance_counter();
3802 }
3803
3804
3805 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3806 int ebuflen) {
3807 char path[MAX_PATH];
3808 DWORD size;
3809 DWORD pathLen = (DWORD)sizeof(path);
3810 HINSTANCE result = NULL;
3811
3812 // only allow library name without path component
3813 assert(strchr(name, '\\') == NULL, "path not allowed");
3814 assert(strchr(name, ':') == NULL, "path not allowed");
3815 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3816 jio_snprintf(ebuf, ebuflen,
3817 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3818 return NULL;
3819 }
3820
3821 // search system directory
3822 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3823 if (size >= pathLen) {
3824 return NULL; // truncated
3825 }
3826 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3827 return NULL; // truncated
3828 }
3829 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3830 return result;
3831 }
3832 }
3833
3834 // try Windows directory
3835 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3836 if (size >= pathLen) {
3837 return NULL; // truncated
3838 }
3839 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3840 return NULL; // truncated
3841 }
3842 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3843 return result;
3844 }
3845 }
3846
3847 jio_snprintf(ebuf, ebuflen,
3848 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3849 return NULL;
3850 }
3851
3852 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3853 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3854
3855 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3856 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3857 return TRUE;
3858 }
3859
3860 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3861 // Basic approach:
3862 // - Each exiting thread registers its intent to exit and then does so.
3863 // - A thread trying to terminate the process must wait for all
3864 // threads currently exiting to complete their exit.
3865
3866 if (os::win32::has_exit_bug()) {
3867 // The array holds handles of the threads that have started exiting by calling
3868 // _endthreadex().
3869 // Should be large enough to avoid blocking the exiting thread due to lack of
3870 // a free slot.
3871 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3872 static int handle_count = 0;
3873
3874 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3875 static CRITICAL_SECTION crit_sect;
3876 static volatile jint process_exiting = 0;
3877 int i, j;
3878 DWORD res;
3879 HANDLE hproc, hthr;
3880
3881 // The first thread that reached this point, initializes the critical section.
3882 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3883 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3884 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3885 if (what != EPT_THREAD) {
3886 // Atomically set process_exiting before the critical section
3887 // to increase the visibility between racing threads.
3888 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3889 }
3890 EnterCriticalSection(&crit_sect);
3891
3892 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3893 // Remove from the array those handles of the threads that have completed exiting.
3894 for (i = 0, j = 0; i < handle_count; ++i) {
3895 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3896 if (res == WAIT_TIMEOUT) {
3897 handles[j++] = handles[i];
3898 } else {
3899 if (res == WAIT_FAILED) {
3900 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3901 GetLastError(), __FILE__, __LINE__);
3902 }
3903 // Don't keep the handle, if we failed waiting for it.
3904 CloseHandle(handles[i]);
3905 }
3906 }
3907
3908 // If there's no free slot in the array of the kept handles, we'll have to
3909 // wait until at least one thread completes exiting.
3910 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3911 // Raise the priority of the oldest exiting thread to increase its chances
3912 // to complete sooner.
3913 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3914 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3915 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3916 i = (res - WAIT_OBJECT_0);
3917 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3918 for (; i < handle_count; ++i) {
3919 handles[i] = handles[i + 1];
3920 }
3921 } else {
3922 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3923 (res == WAIT_FAILED ? "failed" : "timed out"),
3924 GetLastError(), __FILE__, __LINE__);
3925 // Don't keep handles, if we failed waiting for them.
3926 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3927 CloseHandle(handles[i]);
3928 }
3929 handle_count = 0;
3930 }
3931 }
3932
3933 // Store a duplicate of the current thread handle in the array of handles.
3934 hproc = GetCurrentProcess();
3935 hthr = GetCurrentThread();
3936 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3937 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3938 warning("DuplicateHandle failed (%u) in %s: %d\n",
3939 GetLastError(), __FILE__, __LINE__);
3940 } else {
3941 ++handle_count;
3942 }
3943
3944 // The current exiting thread has stored its handle in the array, and now
3945 // should leave the critical section before calling _endthreadex().
3946
3947 } else if (what != EPT_THREAD && handle_count > 0) {
3948 jlong start_time, finish_time, timeout_left;
3949 // Before ending the process, make sure all the threads that had called
3950 // _endthreadex() completed.
3951
3952 // Set the priority level of the current thread to the same value as
3953 // the priority level of exiting threads.
3954 // This is to ensure it will be given a fair chance to execute if
3955 // the timeout expires.
3956 hthr = GetCurrentThread();
3957 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3958 start_time = os::javaTimeNanos();
3959 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3960 for (i = 0; ; ) {
3961 int portion_count = handle_count - i;
3962 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3963 portion_count = MAXIMUM_WAIT_OBJECTS;
3964 }
3965 for (j = 0; j < portion_count; ++j) {
3966 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3967 }
3968 timeout_left = (finish_time - start_time) / 1000000L;
3969 if (timeout_left < 0) {
3970 timeout_left = 0;
3971 }
3972 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3973 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3974 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3975 (res == WAIT_FAILED ? "failed" : "timed out"),
3976 GetLastError(), __FILE__, __LINE__);
3977 // Reset portion_count so we close the remaining
3978 // handles due to this error.
3979 portion_count = handle_count - i;
3980 }
3981 for (j = 0; j < portion_count; ++j) {
3982 CloseHandle(handles[i + j]);
3983 }
3984 if ((i += portion_count) >= handle_count) {
3985 break;
3986 }
3987 start_time = os::javaTimeNanos();
3988 }
3989 handle_count = 0;
3990 }
3991
3992 LeaveCriticalSection(&crit_sect);
3993 }
3994
3995 if (OrderAccess::load_acquire(&process_exiting) != 0 &&
3996 process_exiting != (jint)GetCurrentThreadId()) {
3997 // Some other thread is about to call exit(), so we
3998 // don't let the current thread proceed to exit() or _endthreadex()
3999 while (true) {
4000 SuspendThread(GetCurrentThread());
4001 // Avoid busy-wait loop, if SuspendThread() failed.
4002 Sleep(EXIT_TIMEOUT);
4003 }
4004 }
4005 }
4006
4007 // We are here if either
4008 // - there's no 'race at exit' bug on this OS release;
4009 // - initialization of the critical section failed (unlikely);
4010 // - the current thread has stored its handle and left the critical section;
4011 // - the process-exiting thread has raised the flag and left the critical section.
4012 if (what == EPT_THREAD) {
4013 _endthreadex((unsigned)exit_code);
4014 } else if (what == EPT_PROCESS) {
4015 ::exit(exit_code);
4016 } else {
4017 _exit(exit_code);
4018 }
4019
4020 // Should not reach here
4021 return exit_code;
4022 }
4023
4024 #undef EXIT_TIMEOUT
4025
4026 void os::win32::setmode_streams() {
4027 _setmode(_fileno(stdin), _O_BINARY);
4028 _setmode(_fileno(stdout), _O_BINARY);
4029 _setmode(_fileno(stderr), _O_BINARY);
4030 }
4031
4032
4033 bool os::is_debugger_attached() {
4034 return IsDebuggerPresent() ? true : false;
4035 }
4036
4037
4038 void os::wait_for_keypress_at_exit(void) {
4039 if (PauseAtExit) {
4040 fprintf(stderr, "Press any key to continue...\n");
4041 fgetc(stdin);
4042 }
4043 }
4044
4045
4046 bool os::message_box(const char* title, const char* message) {
4047 int result = MessageBox(NULL, message, title,
4048 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4049 return result == IDYES;
4050 }
4051
4052 #ifndef PRODUCT
4053 #ifndef _WIN64
4054 // Helpers to check whether NX protection is enabled
4055 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4056 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4057 pex->ExceptionRecord->NumberParameters > 0 &&
4058 pex->ExceptionRecord->ExceptionInformation[0] ==
4059 EXCEPTION_INFO_EXEC_VIOLATION) {
4060 return EXCEPTION_EXECUTE_HANDLER;
4061 }
4062 return EXCEPTION_CONTINUE_SEARCH;
4063 }
4064
4065 void nx_check_protection() {
4066 // If NX is enabled we'll get an exception calling into code on the stack
4067 char code[] = { (char)0xC3 }; // ret
4068 void *code_ptr = (void *)code;
4069 __try {
4070 __asm call code_ptr
4071 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4072 tty->print_raw_cr("NX protection detected.");
4073 }
4074 }
4075 #endif // _WIN64
4076 #endif // PRODUCT
4077
4078 // This is called _before_ the global arguments have been parsed
4079 void os::init(void) {
4080 _initial_pid = _getpid();
4081
4082 init_random(1234567);
4083
4084 win32::initialize_system_info();
4085 win32::setmode_streams();
4086 init_page_sizes((size_t) win32::vm_page_size());
4087
4088 // This may be overridden later when argument processing is done.
4089 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4090
4091 // Initialize main_process and main_thread
4092 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4093 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4094 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4095 fatal("DuplicateHandle failed\n");
4096 }
4097 main_thread_id = (int) GetCurrentThreadId();
4098
4099 // initialize fast thread access - only used for 32-bit
4100 win32::initialize_thread_ptr_offset();
4101 }
4102
4103 // To install functions for atexit processing
4104 extern "C" {
4105 static void perfMemory_exit_helper() {
4106 perfMemory_exit();
4107 }
4108 }
4109
4110 static jint initSock();
4111
4112 // this is called _after_ the global arguments have been parsed
4113 jint os::init_2(void) {
4114 // Allocate a single page and mark it as readable for safepoint polling
4115 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4116 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4117
4118 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4119 guarantee(return_page != NULL, "Commit Failed for polling page");
4120
4121 os::set_polling_page(polling_page);
4122
4123 #ifndef PRODUCT
4124 if (Verbose && PrintMiscellaneous) {
4125 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4126 (intptr_t)polling_page);
4127 }
4128 #endif
4129
4130 if (!UseMembar) {
4131 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4132 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4133
4134 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4135 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4136
4137 os::set_memory_serialize_page(mem_serialize_page);
4138
4139 #ifndef PRODUCT
4140 if (Verbose && PrintMiscellaneous) {
4141 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4142 (intptr_t)mem_serialize_page);
4143 }
4144 #endif
4145 }
4146
4147 // Setup Windows Exceptions
4148
4149 // for debugging float code generation bugs
4150 if (ForceFloatExceptions) {
4151 #ifndef _WIN64
4152 static long fp_control_word = 0;
4153 __asm { fstcw fp_control_word }
4154 // see Intel PPro Manual, Vol. 2, p 7-16
4155 const long precision = 0x20;
4156 const long underflow = 0x10;
4157 const long overflow = 0x08;
4158 const long zero_div = 0x04;
4159 const long denorm = 0x02;
4160 const long invalid = 0x01;
4161 fp_control_word |= invalid;
4162 __asm { fldcw fp_control_word }
4163 #endif
4164 }
4165
4166 // If stack_commit_size is 0, windows will reserve the default size,
4167 // but only commit a small portion of it.
4168 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4169 size_t default_reserve_size = os::win32::default_stack_size();
4170 size_t actual_reserve_size = stack_commit_size;
4171 if (stack_commit_size < default_reserve_size) {
4172 // If stack_commit_size == 0, we want this too
4173 actual_reserve_size = default_reserve_size;
4174 }
4175
4176 // Check minimum allowable stack size for thread creation and to initialize
4177 // the java system classes, including StackOverflowError - depends on page
4178 // size. Add a page for compiler2 recursion in main thread.
4179 // Add in 2*BytesPerWord times page size to account for VM stack during
4180 // class initialization depending on 32 or 64 bit VM.
4181 size_t min_stack_allowed =
4182 (size_t)(JavaThread::stack_yellow_zone_size() + JavaThread::stack_red_zone_size() +
4183 JavaThread::stack_shadow_zone_size() +
4184 (2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size());
4185 if (actual_reserve_size < min_stack_allowed) {
4186 tty->print_cr("\nThe stack size specified is too small, "
4187 "Specify at least %dk",
4188 min_stack_allowed / K);
4189 return JNI_ERR;
4190 }
4191
4192 JavaThread::set_stack_size_at_create(stack_commit_size);
4193
4194 // Calculate theoretical max. size of Threads to guard gainst artifical
4195 // out-of-memory situations, where all available address-space has been
4196 // reserved by thread stacks.
4197 assert(actual_reserve_size != 0, "Must have a stack");
4198
4199 // Calculate the thread limit when we should start doing Virtual Memory
4200 // banging. Currently when the threads will have used all but 200Mb of space.
4201 //
4202 // TODO: consider performing a similar calculation for commit size instead
4203 // as reserve size, since on a 64-bit platform we'll run into that more
4204 // often than running out of virtual memory space. We can use the
4205 // lower value of the two calculations as the os_thread_limit.
4206 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4207 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4208
4209 // at exit methods are called in the reverse order of their registration.
4210 // there is no limit to the number of functions registered. atexit does
4211 // not set errno.
4212
4213 if (PerfAllowAtExitRegistration) {
4214 // only register atexit functions if PerfAllowAtExitRegistration is set.
4215 // atexit functions can be delayed until process exit time, which
4216 // can be problematic for embedded VM situations. Embedded VMs should
4217 // call DestroyJavaVM() to assure that VM resources are released.
4218
4219 // note: perfMemory_exit_helper atexit function may be removed in
4220 // the future if the appropriate cleanup code can be added to the
4221 // VM_Exit VMOperation's doit method.
4222 if (atexit(perfMemory_exit_helper) != 0) {
4223 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4224 }
4225 }
4226
4227 #ifndef _WIN64
4228 // Print something if NX is enabled (win32 on AMD64)
4229 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4230 #endif
4231
4232 // initialize thread priority policy
4233 prio_init();
4234
4235 if (UseNUMA && !ForceNUMA) {
4236 UseNUMA = false; // We don't fully support this yet
4237 }
4238
4239 if (UseNUMAInterleaving) {
4240 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4241 bool success = numa_interleaving_init();
4242 if (!success) UseNUMAInterleaving = false;
4243 }
4244
4245 if (initSock() != JNI_OK) {
4246 return JNI_ERR;
4247 }
4248
4249 return JNI_OK;
4250 }
4251
4252 // Mark the polling page as unreadable
4253 void os::make_polling_page_unreadable(void) {
4254 DWORD old_status;
4255 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4256 PAGE_NOACCESS, &old_status)) {
4257 fatal("Could not disable polling page");
4258 }
4259 }
4260
4261 // Mark the polling page as readable
4262 void os::make_polling_page_readable(void) {
4263 DWORD old_status;
4264 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4265 PAGE_READONLY, &old_status)) {
4266 fatal("Could not enable polling page");
4267 }
4268 }
4269
4270
4271 int os::stat(const char *path, struct stat *sbuf) {
4272 char pathbuf[MAX_PATH];
4273 if (strlen(path) > MAX_PATH - 1) {
4274 errno = ENAMETOOLONG;
4275 return -1;
4276 }
4277 os::native_path(strcpy(pathbuf, path));
4278 int ret = ::stat(pathbuf, sbuf);
4279 if (sbuf != NULL && UseUTCFileTimestamp) {
4280 // Fix for 6539723. st_mtime returned from stat() is dependent on
4281 // the system timezone and so can return different values for the
4282 // same file if/when daylight savings time changes. This adjustment
4283 // makes sure the same timestamp is returned regardless of the TZ.
4284 //
4285 // See:
4286 // http://msdn.microsoft.com/library/
4287 // default.asp?url=/library/en-us/sysinfo/base/
4288 // time_zone_information_str.asp
4289 // and
4290 // http://msdn.microsoft.com/library/default.asp?url=
4291 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4292 //
4293 // NOTE: there is a insidious bug here: If the timezone is changed
4294 // after the call to stat() but before 'GetTimeZoneInformation()', then
4295 // the adjustment we do here will be wrong and we'll return the wrong
4296 // value (which will likely end up creating an invalid class data
4297 // archive). Absent a better API for this, or some time zone locking
4298 // mechanism, we'll have to live with this risk.
4299 TIME_ZONE_INFORMATION tz;
4300 DWORD tzid = GetTimeZoneInformation(&tz);
4301 int daylightBias =
4302 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4303 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4304 }
4305 return ret;
4306 }
4307
4308
4309 #define FT2INT64(ft) \
4310 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4311
4312
4313 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4314 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4315 // of a thread.
4316 //
4317 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4318 // the fast estimate available on the platform.
4319
4320 // current_thread_cpu_time() is not optimized for Windows yet
4321 jlong os::current_thread_cpu_time() {
4322 // return user + sys since the cost is the same
4323 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4324 }
4325
4326 jlong os::thread_cpu_time(Thread* thread) {
4327 // consistent with what current_thread_cpu_time() returns.
4328 return os::thread_cpu_time(thread, true /* user+sys */);
4329 }
4330
4331 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4332 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4333 }
4334
4335 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4336 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4337 // If this function changes, os::is_thread_cpu_time_supported() should too
4338 FILETIME CreationTime;
4339 FILETIME ExitTime;
4340 FILETIME KernelTime;
4341 FILETIME UserTime;
4342
4343 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4344 &ExitTime, &KernelTime, &UserTime) == 0) {
4345 return -1;
4346 } else if (user_sys_cpu_time) {
4347 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4348 } else {
4349 return FT2INT64(UserTime) * 100;
4350 }
4351 }
4352
4353 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4354 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4355 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4356 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4357 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4358 }
4359
4360 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4361 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4362 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4363 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4364 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4365 }
4366
4367 bool os::is_thread_cpu_time_supported() {
4368 // see os::thread_cpu_time
4369 FILETIME CreationTime;
4370 FILETIME ExitTime;
4371 FILETIME KernelTime;
4372 FILETIME UserTime;
4373
4374 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4375 &KernelTime, &UserTime) == 0) {
4376 return false;
4377 } else {
4378 return true;
4379 }
4380 }
4381
4382 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4383 // It does have primitives (PDH API) to get CPU usage and run queue length.
4384 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4385 // If we wanted to implement loadavg on Windows, we have a few options:
4386 //
4387 // a) Query CPU usage and run queue length and "fake" an answer by
4388 // returning the CPU usage if it's under 100%, and the run queue
4389 // length otherwise. It turns out that querying is pretty slow
4390 // on Windows, on the order of 200 microseconds on a fast machine.
4391 // Note that on the Windows the CPU usage value is the % usage
4392 // since the last time the API was called (and the first call
4393 // returns 100%), so we'd have to deal with that as well.
4394 //
4395 // b) Sample the "fake" answer using a sampling thread and store
4396 // the answer in a global variable. The call to loadavg would
4397 // just return the value of the global, avoiding the slow query.
4398 //
4399 // c) Sample a better answer using exponential decay to smooth the
4400 // value. This is basically the algorithm used by UNIX kernels.
4401 //
4402 // Note that sampling thread starvation could affect both (b) and (c).
4403 int os::loadavg(double loadavg[], int nelem) {
4404 return -1;
4405 }
4406
4407
4408 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4409 bool os::dont_yield() {
4410 return DontYieldALot;
4411 }
4412
4413 // This method is a slightly reworked copy of JDK's sysOpen
4414 // from src/windows/hpi/src/sys_api_md.c
4415
4416 int os::open(const char *path, int oflag, int mode) {
4417 char pathbuf[MAX_PATH];
4418
4419 if (strlen(path) > MAX_PATH - 1) {
4420 errno = ENAMETOOLONG;
4421 return -1;
4422 }
4423 os::native_path(strcpy(pathbuf, path));
4424 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4425 }
4426
4427 FILE* os::open(int fd, const char* mode) {
4428 return ::_fdopen(fd, mode);
4429 }
4430
4431 // Is a (classpath) directory empty?
4432 bool os::dir_is_empty(const char* path) {
4433 WIN32_FIND_DATA fd;
4434 HANDLE f = FindFirstFile(path, &fd);
4435 if (f == INVALID_HANDLE_VALUE) {
4436 return true;
4437 }
4438 FindClose(f);
4439 return false;
4440 }
4441
4442 // create binary file, rewriting existing file if required
4443 int os::create_binary_file(const char* path, bool rewrite_existing) {
4444 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4445 if (!rewrite_existing) {
4446 oflags |= _O_EXCL;
4447 }
4448 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4449 }
4450
4451 // return current position of file pointer
4452 jlong os::current_file_offset(int fd) {
4453 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4454 }
4455
4456 // move file pointer to the specified offset
4457 jlong os::seek_to_file_offset(int fd, jlong offset) {
4458 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4459 }
4460
4461
4462 jlong os::lseek(int fd, jlong offset, int whence) {
4463 return (jlong) ::_lseeki64(fd, offset, whence);
4464 }
4465
4466 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4467 OVERLAPPED ov;
4468 DWORD nread;
4469 BOOL result;
4470
4471 ZeroMemory(&ov, sizeof(ov));
4472 ov.Offset = (DWORD)offset;
4473 ov.OffsetHigh = (DWORD)(offset >> 32);
4474
4475 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4476
4477 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4478
4479 return result ? nread : 0;
4480 }
4481
4482
4483 // This method is a slightly reworked copy of JDK's sysNativePath
4484 // from src/windows/hpi/src/path_md.c
4485
4486 // Convert a pathname to native format. On win32, this involves forcing all
4487 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4488 // sometimes rejects '/') and removing redundant separators. The input path is
4489 // assumed to have been converted into the character encoding used by the local
4490 // system. Because this might be a double-byte encoding, care is taken to
4491 // treat double-byte lead characters correctly.
4492 //
4493 // This procedure modifies the given path in place, as the result is never
4494 // longer than the original. There is no error return; this operation always
4495 // succeeds.
4496 char * os::native_path(char *path) {
4497 char *src = path, *dst = path, *end = path;
4498 char *colon = NULL; // If a drive specifier is found, this will
4499 // point to the colon following the drive letter
4500
4501 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4502 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4503 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4504
4505 // Check for leading separators
4506 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4507 while (isfilesep(*src)) {
4508 src++;
4509 }
4510
4511 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4512 // Remove leading separators if followed by drive specifier. This
4513 // hack is necessary to support file URLs containing drive
4514 // specifiers (e.g., "file://c:/path"). As a side effect,
4515 // "/c:/path" can be used as an alternative to "c:/path".
4516 *dst++ = *src++;
4517 colon = dst;
4518 *dst++ = ':';
4519 src++;
4520 } else {
4521 src = path;
4522 if (isfilesep(src[0]) && isfilesep(src[1])) {
4523 // UNC pathname: Retain first separator; leave src pointed at
4524 // second separator so that further separators will be collapsed
4525 // into the second separator. The result will be a pathname
4526 // beginning with "\\\\" followed (most likely) by a host name.
4527 src = dst = path + 1;
4528 path[0] = '\\'; // Force first separator to '\\'
4529 }
4530 }
4531
4532 end = dst;
4533
4534 // Remove redundant separators from remainder of path, forcing all
4535 // separators to be '\\' rather than '/'. Also, single byte space
4536 // characters are removed from the end of the path because those
4537 // are not legal ending characters on this operating system.
4538 //
4539 while (*src != '\0') {
4540 if (isfilesep(*src)) {
4541 *dst++ = '\\'; src++;
4542 while (isfilesep(*src)) src++;
4543 if (*src == '\0') {
4544 // Check for trailing separator
4545 end = dst;
4546 if (colon == dst - 2) break; // "z:\\"
4547 if (dst == path + 1) break; // "\\"
4548 if (dst == path + 2 && isfilesep(path[0])) {
4549 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4550 // beginning of a UNC pathname. Even though it is not, by
4551 // itself, a valid UNC pathname, we leave it as is in order
4552 // to be consistent with the path canonicalizer as well
4553 // as the win32 APIs, which treat this case as an invalid
4554 // UNC pathname rather than as an alias for the root
4555 // directory of the current drive.
4556 break;
4557 }
4558 end = --dst; // Path does not denote a root directory, so
4559 // remove trailing separator
4560 break;
4561 }
4562 end = dst;
4563 } else {
4564 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4565 *dst++ = *src++;
4566 if (*src) *dst++ = *src++;
4567 end = dst;
4568 } else { // Copy a single-byte character
4569 char c = *src++;
4570 *dst++ = c;
4571 // Space is not a legal ending character
4572 if (c != ' ') end = dst;
4573 }
4574 }
4575 }
4576
4577 *end = '\0';
4578
4579 // For "z:", add "." to work around a bug in the C runtime library
4580 if (colon == dst - 1) {
4581 path[2] = '.';
4582 path[3] = '\0';
4583 }
4584
4585 return path;
4586 }
4587
4588 // This code is a copy of JDK's sysSetLength
4589 // from src/windows/hpi/src/sys_api_md.c
4590
4591 int os::ftruncate(int fd, jlong length) {
4592 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4593 long high = (long)(length >> 32);
4594 DWORD ret;
4595
4596 if (h == (HANDLE)(-1)) {
4597 return -1;
4598 }
4599
4600 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4601 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4602 return -1;
4603 }
4604
4605 if (::SetEndOfFile(h) == FALSE) {
4606 return -1;
4607 }
4608
4609 return 0;
4610 }
4611
4612
4613 // This code is a copy of JDK's sysSync
4614 // from src/windows/hpi/src/sys_api_md.c
4615 // except for the legacy workaround for a bug in Win 98
4616
4617 int os::fsync(int fd) {
4618 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4619
4620 if ((!::FlushFileBuffers(handle)) &&
4621 (GetLastError() != ERROR_ACCESS_DENIED)) {
4622 // from winerror.h
4623 return -1;
4624 }
4625 return 0;
4626 }
4627
4628 static int nonSeekAvailable(int, long *);
4629 static int stdinAvailable(int, long *);
4630
4631 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4632 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4633
4634 // This code is a copy of JDK's sysAvailable
4635 // from src/windows/hpi/src/sys_api_md.c
4636
4637 int os::available(int fd, jlong *bytes) {
4638 jlong cur, end;
4639 struct _stati64 stbuf64;
4640
4641 if (::_fstati64(fd, &stbuf64) >= 0) {
4642 int mode = stbuf64.st_mode;
4643 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4644 int ret;
4645 long lpbytes;
4646 if (fd == 0) {
4647 ret = stdinAvailable(fd, &lpbytes);
4648 } else {
4649 ret = nonSeekAvailable(fd, &lpbytes);
4650 }
4651 (*bytes) = (jlong)(lpbytes);
4652 return ret;
4653 }
4654 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4655 return FALSE;
4656 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4657 return FALSE;
4658 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4659 return FALSE;
4660 }
4661 *bytes = end - cur;
4662 return TRUE;
4663 } else {
4664 return FALSE;
4665 }
4666 }
4667
4668 // This code is a copy of JDK's nonSeekAvailable
4669 // from src/windows/hpi/src/sys_api_md.c
4670
4671 static int nonSeekAvailable(int fd, long *pbytes) {
4672 // This is used for available on non-seekable devices
4673 // (like both named and anonymous pipes, such as pipes
4674 // connected to an exec'd process).
4675 // Standard Input is a special case.
4676 HANDLE han;
4677
4678 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4679 return FALSE;
4680 }
4681
4682 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4683 // PeekNamedPipe fails when at EOF. In that case we
4684 // simply make *pbytes = 0 which is consistent with the
4685 // behavior we get on Solaris when an fd is at EOF.
4686 // The only alternative is to raise an Exception,
4687 // which isn't really warranted.
4688 //
4689 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4690 return FALSE;
4691 }
4692 *pbytes = 0;
4693 }
4694 return TRUE;
4695 }
4696
4697 #define MAX_INPUT_EVENTS 2000
4698
4699 // This code is a copy of JDK's stdinAvailable
4700 // from src/windows/hpi/src/sys_api_md.c
4701
4702 static int stdinAvailable(int fd, long *pbytes) {
4703 HANDLE han;
4704 DWORD numEventsRead = 0; // Number of events read from buffer
4705 DWORD numEvents = 0; // Number of events in buffer
4706 DWORD i = 0; // Loop index
4707 DWORD curLength = 0; // Position marker
4708 DWORD actualLength = 0; // Number of bytes readable
4709 BOOL error = FALSE; // Error holder
4710 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4711
4712 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4713 return FALSE;
4714 }
4715
4716 // Construct an array of input records in the console buffer
4717 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4718 if (error == 0) {
4719 return nonSeekAvailable(fd, pbytes);
4720 }
4721
4722 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4723 if (numEvents > MAX_INPUT_EVENTS) {
4724 numEvents = MAX_INPUT_EVENTS;
4725 }
4726
4727 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4728 if (lpBuffer == NULL) {
4729 return FALSE;
4730 }
4731
4732 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4733 if (error == 0) {
4734 os::free(lpBuffer);
4735 return FALSE;
4736 }
4737
4738 // Examine input records for the number of bytes available
4739 for (i=0; i<numEvents; i++) {
4740 if (lpBuffer[i].EventType == KEY_EVENT) {
4741
4742 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4743 &(lpBuffer[i].Event);
4744 if (keyRecord->bKeyDown == TRUE) {
4745 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4746 curLength++;
4747 if (*keyPressed == '\r') {
4748 actualLength = curLength;
4749 }
4750 }
4751 }
4752 }
4753
4754 if (lpBuffer != NULL) {
4755 os::free(lpBuffer);
4756 }
4757
4758 *pbytes = (long) actualLength;
4759 return TRUE;
4760 }
4761
4762 // Map a block of memory.
4763 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4764 char *addr, size_t bytes, bool read_only,
4765 bool allow_exec) {
4766 HANDLE hFile;
4767 char* base;
4768
4769 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4770 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4771 if (hFile == NULL) {
4772 if (PrintMiscellaneous && Verbose) {
4773 DWORD err = GetLastError();
4774 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4775 }
4776 return NULL;
4777 }
4778
4779 if (allow_exec) {
4780 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4781 // unless it comes from a PE image (which the shared archive is not.)
4782 // Even VirtualProtect refuses to give execute access to mapped memory
4783 // that was not previously executable.
4784 //
4785 // Instead, stick the executable region in anonymous memory. Yuck.
4786 // Penalty is that ~4 pages will not be shareable - in the future
4787 // we might consider DLLizing the shared archive with a proper PE
4788 // header so that mapping executable + sharing is possible.
4789
4790 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4791 PAGE_READWRITE);
4792 if (base == NULL) {
4793 if (PrintMiscellaneous && Verbose) {
4794 DWORD err = GetLastError();
4795 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4796 }
4797 CloseHandle(hFile);
4798 return NULL;
4799 }
4800
4801 DWORD bytes_read;
4802 OVERLAPPED overlapped;
4803 overlapped.Offset = (DWORD)file_offset;
4804 overlapped.OffsetHigh = 0;
4805 overlapped.hEvent = NULL;
4806 // ReadFile guarantees that if the return value is true, the requested
4807 // number of bytes were read before returning.
4808 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4809 if (!res) {
4810 if (PrintMiscellaneous && Verbose) {
4811 DWORD err = GetLastError();
4812 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4813 }
4814 release_memory(base, bytes);
4815 CloseHandle(hFile);
4816 return NULL;
4817 }
4818 } else {
4819 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4820 NULL /* file_name */);
4821 if (hMap == NULL) {
4822 if (PrintMiscellaneous && Verbose) {
4823 DWORD err = GetLastError();
4824 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4825 }
4826 CloseHandle(hFile);
4827 return NULL;
4828 }
4829
4830 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4831 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4832 (DWORD)bytes, addr);
4833 if (base == NULL) {
4834 if (PrintMiscellaneous && Verbose) {
4835 DWORD err = GetLastError();
4836 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4837 }
4838 CloseHandle(hMap);
4839 CloseHandle(hFile);
4840 return NULL;
4841 }
4842
4843 if (CloseHandle(hMap) == 0) {
4844 if (PrintMiscellaneous && Verbose) {
4845 DWORD err = GetLastError();
4846 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4847 }
4848 CloseHandle(hFile);
4849 return base;
4850 }
4851 }
4852
4853 if (allow_exec) {
4854 DWORD old_protect;
4855 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4856 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4857
4858 if (!res) {
4859 if (PrintMiscellaneous && Verbose) {
4860 DWORD err = GetLastError();
4861 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4862 }
4863 // Don't consider this a hard error, on IA32 even if the
4864 // VirtualProtect fails, we should still be able to execute
4865 CloseHandle(hFile);
4866 return base;
4867 }
4868 }
4869
4870 if (CloseHandle(hFile) == 0) {
4871 if (PrintMiscellaneous && Verbose) {
4872 DWORD err = GetLastError();
4873 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4874 }
4875 return base;
4876 }
4877
4878 return base;
4879 }
4880
4881
4882 // Remap a block of memory.
4883 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4884 char *addr, size_t bytes, bool read_only,
4885 bool allow_exec) {
4886 // This OS does not allow existing memory maps to be remapped so we
4887 // have to unmap the memory before we remap it.
4888 if (!os::unmap_memory(addr, bytes)) {
4889 return NULL;
4890 }
4891
4892 // There is a very small theoretical window between the unmap_memory()
4893 // call above and the map_memory() call below where a thread in native
4894 // code may be able to access an address that is no longer mapped.
4895
4896 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4897 read_only, allow_exec);
4898 }
4899
4900
4901 // Unmap a block of memory.
4902 // Returns true=success, otherwise false.
4903
4904 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4905 MEMORY_BASIC_INFORMATION mem_info;
4906 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4907 if (PrintMiscellaneous && Verbose) {
4908 DWORD err = GetLastError();
4909 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4910 }
4911 return false;
4912 }
4913
4914 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4915 // Instead, executable region was allocated using VirtualAlloc(). See
4916 // pd_map_memory() above.
4917 //
4918 // The following flags should match the 'exec_access' flages used for
4919 // VirtualProtect() in pd_map_memory().
4920 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4921 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4922 return pd_release_memory(addr, bytes);
4923 }
4924
4925 BOOL result = UnmapViewOfFile(addr);
4926 if (result == 0) {
4927 if (PrintMiscellaneous && Verbose) {
4928 DWORD err = GetLastError();
4929 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4930 }
4931 return false;
4932 }
4933 return true;
4934 }
4935
4936 void os::pause() {
4937 char filename[MAX_PATH];
4938 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4939 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4940 } else {
4941 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4942 }
4943
4944 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4945 if (fd != -1) {
4946 struct stat buf;
4947 ::close(fd);
4948 while (::stat(filename, &buf) == 0) {
4949 Sleep(100);
4950 }
4951 } else {
4952 jio_fprintf(stderr,
4953 "Could not open pause file '%s', continuing immediately.\n", filename);
4954 }
4955 }
4956
4957 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4958 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4959 }
4960
4961 // See the caveats for this class in os_windows.hpp
4962 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4963 // into this method and returns false. If no OS EXCEPTION was raised, returns
4964 // true.
4965 // The callback is supposed to provide the method that should be protected.
4966 //
4967 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4968 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4969 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4970 "crash_protection already set?");
4971
4972 bool success = true;
4973 __try {
4974 WatcherThread::watcher_thread()->set_crash_protection(this);
4975 cb.call();
4976 } __except(EXCEPTION_EXECUTE_HANDLER) {
4977 // only for protection, nothing to do
4978 success = false;
4979 }
4980 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4981 return success;
4982 }
4983
4984 // An Event wraps a win32 "CreateEvent" kernel handle.
4985 //
4986 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4987 //
4988 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4989 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4990 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4991 // In addition, an unpark() operation might fetch the handle field, but the
4992 // event could recycle between the fetch and the SetEvent() operation.
4993 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4994 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4995 // on an stale but recycled handle would be harmless, but in practice this might
4996 // confuse other non-Sun code, so it's not a viable approach.
4997 //
4998 // 2: Once a win32 event handle is associated with an Event, it remains associated
4999 // with the Event. The event handle is never closed. This could be construed
5000 // as handle leakage, but only up to the maximum # of threads that have been extant
5001 // at any one time. This shouldn't be an issue, as windows platforms typically
5002 // permit a process to have hundreds of thousands of open handles.
5003 //
5004 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5005 // and release unused handles.
5006 //
5007 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5008 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5009 //
5010 // 5. Use an RCU-like mechanism (Read-Copy Update).
5011 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5012 //
5013 // We use (2).
5014 //
5015 // TODO-FIXME:
5016 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5017 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5018 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5019 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5020 // into a single win32 CreateEvent() handle.
5021 //
5022 // Assumption:
5023 // Only one parker can exist on an event, which is why we allocate
5024 // them per-thread. Multiple unparkers can coexist.
5025 //
5026 // _Event transitions in park()
5027 // -1 => -1 : illegal
5028 // 1 => 0 : pass - return immediately
5029 // 0 => -1 : block; then set _Event to 0 before returning
5030 //
5031 // _Event transitions in unpark()
5032 // 0 => 1 : just return
5033 // 1 => 1 : just return
5034 // -1 => either 0 or 1; must signal target thread
5035 // That is, we can safely transition _Event from -1 to either
5036 // 0 or 1.
5037 //
5038 // _Event serves as a restricted-range semaphore.
5039 // -1 : thread is blocked, i.e. there is a waiter
5040 // 0 : neutral: thread is running or ready,
5041 // could have been signaled after a wait started
5042 // 1 : signaled - thread is running or ready
5043 //
5044 // Another possible encoding of _Event would be with
5045 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5046 //
5047
5048 int os::PlatformEvent::park(jlong Millis) {
5049 // Transitions for _Event:
5050 // -1 => -1 : illegal
5051 // 1 => 0 : pass - return immediately
5052 // 0 => -1 : block; then set _Event to 0 before returning
5053
5054 guarantee(_ParkHandle != NULL , "Invariant");
5055 guarantee(Millis > 0 , "Invariant");
5056
5057 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5058 // the initial park() operation.
5059 // Consider: use atomic decrement instead of CAS-loop
5060
5061 int v;
5062 for (;;) {
5063 v = _Event;
5064 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5065 }
5066 guarantee((v == 0) || (v == 1), "invariant");
5067 if (v != 0) return OS_OK;
5068
5069 // Do this the hard way by blocking ...
5070 // TODO: consider a brief spin here, gated on the success of recent
5071 // spin attempts by this thread.
5072 //
5073 // We decompose long timeouts into series of shorter timed waits.
5074 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5075 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5076 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5077 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5078 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5079 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5080 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5081 // for the already waited time. This policy does not admit any new outcomes.
5082 // In the future, however, we might want to track the accumulated wait time and
5083 // adjust Millis accordingly if we encounter a spurious wakeup.
5084
5085 const int MAXTIMEOUT = 0x10000000;
5086 DWORD rv = WAIT_TIMEOUT;
5087 while (_Event < 0 && Millis > 0) {
5088 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5089 if (Millis > MAXTIMEOUT) {
5090 prd = MAXTIMEOUT;
5091 }
5092 rv = ::WaitForSingleObject(_ParkHandle, prd);
5093 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5094 if (rv == WAIT_TIMEOUT) {
5095 Millis -= prd;
5096 }
5097 }
5098 v = _Event;
5099 _Event = 0;
5100 // see comment at end of os::PlatformEvent::park() below:
5101 OrderAccess::fence();
5102 // If we encounter a nearly simultanous timeout expiry and unpark()
5103 // we return OS_OK indicating we awoke via unpark().
5104 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5105 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5106 }
5107
5108 void os::PlatformEvent::park() {
5109 // Transitions for _Event:
5110 // -1 => -1 : illegal
5111 // 1 => 0 : pass - return immediately
5112 // 0 => -1 : block; then set _Event to 0 before returning
5113
5114 guarantee(_ParkHandle != NULL, "Invariant");
5115 // Invariant: Only the thread associated with the Event/PlatformEvent
5116 // may call park().
5117 // Consider: use atomic decrement instead of CAS-loop
5118 int v;
5119 for (;;) {
5120 v = _Event;
5121 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5122 }
5123 guarantee((v == 0) || (v == 1), "invariant");
5124 if (v != 0) return;
5125
5126 // Do this the hard way by blocking ...
5127 // TODO: consider a brief spin here, gated on the success of recent
5128 // spin attempts by this thread.
5129 while (_Event < 0) {
5130 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5131 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5132 }
5133
5134 // Usually we'll find _Event == 0 at this point, but as
5135 // an optional optimization we clear it, just in case can
5136 // multiple unpark() operations drove _Event up to 1.
5137 _Event = 0;
5138 OrderAccess::fence();
5139 guarantee(_Event >= 0, "invariant");
5140 }
5141
5142 void os::PlatformEvent::unpark() {
5143 guarantee(_ParkHandle != NULL, "Invariant");
5144
5145 // Transitions for _Event:
5146 // 0 => 1 : just return
5147 // 1 => 1 : just return
5148 // -1 => either 0 or 1; must signal target thread
5149 // That is, we can safely transition _Event from -1 to either
5150 // 0 or 1.
5151 // See also: "Semaphores in Plan 9" by Mullender & Cox
5152 //
5153 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5154 // that it will take two back-to-back park() calls for the owning
5155 // thread to block. This has the benefit of forcing a spurious return
5156 // from the first park() call after an unpark() call which will help
5157 // shake out uses of park() and unpark() without condition variables.
5158
5159 if (Atomic::xchg(1, &_Event) >= 0) return;
5160
5161 ::SetEvent(_ParkHandle);
5162 }
5163
5164
5165 // JSR166
5166 // -------------------------------------------------------
5167
5168 // The Windows implementation of Park is very straightforward: Basic
5169 // operations on Win32 Events turn out to have the right semantics to
5170 // use them directly. We opportunistically resuse the event inherited
5171 // from Monitor.
5172
5173 void Parker::park(bool isAbsolute, jlong time) {
5174 guarantee(_ParkEvent != NULL, "invariant");
5175 // First, demultiplex/decode time arguments
5176 if (time < 0) { // don't wait
5177 return;
5178 } else if (time == 0 && !isAbsolute) {
5179 time = INFINITE;
5180 } else if (isAbsolute) {
5181 time -= os::javaTimeMillis(); // convert to relative time
5182 if (time <= 0) { // already elapsed
5183 return;
5184 }
5185 } else { // relative
5186 time /= 1000000; // Must coarsen from nanos to millis
5187 if (time == 0) { // Wait for the minimal time unit if zero
5188 time = 1;
5189 }
5190 }
5191
5192 JavaThread* thread = JavaThread::current();
5193
5194 // Don't wait if interrupted or already triggered
5195 if (Thread::is_interrupted(thread, false) ||
5196 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5197 ResetEvent(_ParkEvent);
5198 return;
5199 } else {
5200 ThreadBlockInVM tbivm(thread);
5201 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5202 thread->set_suspend_equivalent();
5203
5204 WaitForSingleObject(_ParkEvent, time);
5205 ResetEvent(_ParkEvent);
5206
5207 // If externally suspended while waiting, re-suspend
5208 if (thread->handle_special_suspend_equivalent_condition()) {
5209 thread->java_suspend_self();
5210 }
5211 }
5212 }
5213
5214 void Parker::unpark() {
5215 guarantee(_ParkEvent != NULL, "invariant");
5216 SetEvent(_ParkEvent);
5217 }
5218
5219 // Run the specified command in a separate process. Return its exit value,
5220 // or -1 on failure (e.g. can't create a new process).
5221 int os::fork_and_exec(char* cmd) {
5222 STARTUPINFO si;
5223 PROCESS_INFORMATION pi;
5224
5225 memset(&si, 0, sizeof(si));
5226 si.cb = sizeof(si);
5227 memset(&pi, 0, sizeof(pi));
5228 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5229 cmd, // command line
5230 NULL, // process security attribute
5231 NULL, // thread security attribute
5232 TRUE, // inherits system handles
5233 0, // no creation flags
5234 NULL, // use parent's environment block
5235 NULL, // use parent's starting directory
5236 &si, // (in) startup information
5237 &pi); // (out) process information
5238
5239 if (rslt) {
5240 // Wait until child process exits.
5241 WaitForSingleObject(pi.hProcess, INFINITE);
5242
5243 DWORD exit_code;
5244 GetExitCodeProcess(pi.hProcess, &exit_code);
5245
5246 // Close process and thread handles.
5247 CloseHandle(pi.hProcess);
5248 CloseHandle(pi.hThread);
5249
5250 return (int)exit_code;
5251 } else {
5252 return -1;
5253 }
5254 }
5255
5256 //--------------------------------------------------------------------------------------------------
5257 // Non-product code
5258
5259 static int mallocDebugIntervalCounter = 0;
5260 static int mallocDebugCounter = 0;
5261 bool os::check_heap(bool force) {
5262 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5263 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5264 // Note: HeapValidate executes two hardware breakpoints when it finds something
5265 // wrong; at these points, eax contains the address of the offending block (I think).
5266 // To get to the exlicit error message(s) below, just continue twice.
5267 //
5268 // Note: we want to check the CRT heap, which is not necessarily located in the
5269 // process default heap.
5270 HANDLE heap = (HANDLE) _get_heap_handle();
5271 if (!heap) {
5272 return true;
5273 }
5274
5275 // If we fail to lock the heap, then gflags.exe has been used
5276 // or some other special heap flag has been set that prevents
5277 // locking. We don't try to walk a heap we can't lock.
5278 if (HeapLock(heap) != 0) {
5279 PROCESS_HEAP_ENTRY phe;
5280 phe.lpData = NULL;
5281 while (HeapWalk(heap, &phe) != 0) {
5282 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5283 !HeapValidate(heap, 0, phe.lpData)) {
5284 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5285 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5286 HeapUnlock(heap);
5287 fatal("corrupted C heap");
5288 }
5289 }
5290 DWORD err = GetLastError();
5291 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5292 HeapUnlock(heap);
5293 fatal("heap walk aborted with error %d", err);
5294 }
5295 HeapUnlock(heap);
5296 }
5297 mallocDebugIntervalCounter = 0;
5298 }
5299 return true;
5300 }
5301
5302
5303 bool os::find(address addr, outputStream* st) {
5304 int offset = -1;
5305 bool result = false;
5306 char buf[256];
5307 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5308 st->print(PTR_FORMAT " ", addr);
5309 if (strlen(buf) < sizeof(buf) - 1) {
5310 char* p = strrchr(buf, '\\');
5311 if (p) {
5312 st->print("%s", p + 1);
5313 } else {
5314 st->print("%s", buf);
5315 }
5316 } else {
5317 // The library name is probably truncated. Let's omit the library name.
5318 // See also JDK-8147512.
5319 }
5320 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5321 st->print("::%s + 0x%x", buf, offset);
5322 }
5323 st->cr();
5324 result = true;
5325 }
5326 return result;
5327 }
5328
5329 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5330 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5331
5332 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5333 JavaThread* thread = JavaThread::current();
5334 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5335 address addr = (address) exceptionRecord->ExceptionInformation[1];
5336
5337 if (os::is_memory_serialize_page(thread, addr)) {
5338 return EXCEPTION_CONTINUE_EXECUTION;
5339 }
5340 }
5341
5342 return EXCEPTION_CONTINUE_SEARCH;
5343 }
5344
5345 // We don't build a headless jre for Windows
5346 bool os::is_headless_jre() { return false; }
5347
5348 static jint initSock() {
5349 WSADATA wsadata;
5350
5351 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5352 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5353 ::GetLastError());
5354 return JNI_ERR;
5355 }
5356 return JNI_OK;
5357 }
5358
5359 struct hostent* os::get_host_by_name(char* name) {
5360 return (struct hostent*)gethostbyname(name);
5361 }
5362
5363 int os::socket_close(int fd) {
5364 return ::closesocket(fd);
5365 }
5366
5367 int os::socket(int domain, int type, int protocol) {
5368 return ::socket(domain, type, protocol);
5369 }
5370
5371 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5372 return ::connect(fd, him, len);
5373 }
5374
5375 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5376 return ::recv(fd, buf, (int)nBytes, flags);
5377 }
5378
5379 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5380 return ::send(fd, buf, (int)nBytes, flags);
5381 }
5382
5383 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5384 return ::send(fd, buf, (int)nBytes, flags);
5385 }
5386
5387 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5388 #if defined(IA32)
5389 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5390 #elif defined (AMD64)
5391 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5392 #endif
5393
5394 // returns true if thread could be suspended,
5395 // false otherwise
5396 static bool do_suspend(HANDLE* h) {
5397 if (h != NULL) {
5398 if (SuspendThread(*h) != ~0) {
5399 return true;
5400 }
5401 }
5402 return false;
5403 }
5404
5405 // resume the thread
5406 // calling resume on an active thread is a no-op
5407 static void do_resume(HANDLE* h) {
5408 if (h != NULL) {
5409 ResumeThread(*h);
5410 }
5411 }
5412
5413 // retrieve a suspend/resume context capable handle
5414 // from the tid. Caller validates handle return value.
5415 void get_thread_handle_for_extended_context(HANDLE* h,
5416 OSThread::thread_id_t tid) {
5417 if (h != NULL) {
5418 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5419 }
5420 }
5421
5422 // Thread sampling implementation
5423 //
5424 void os::SuspendedThreadTask::internal_do_task() {
5425 CONTEXT ctxt;
5426 HANDLE h = NULL;
5427
5428 // get context capable handle for thread
5429 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5430
5431 // sanity
5432 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5433 return;
5434 }
5435
5436 // suspend the thread
5437 if (do_suspend(&h)) {
5438 ctxt.ContextFlags = sampling_context_flags;
5439 // get thread context
5440 GetThreadContext(h, &ctxt);
5441 SuspendedThreadTaskContext context(_thread, &ctxt);
5442 // pass context to Thread Sampling impl
5443 do_task(context);
5444 // resume thread
5445 do_resume(&h);
5446 }
5447
5448 // close handle
5449 CloseHandle(h);
5450 }
5451
5452 bool os::start_debugging(char *buf, int buflen) {
5453 int len = (int)strlen(buf);
5454 char *p = &buf[len];
5455
5456 jio_snprintf(p, buflen-len,
5457 "\n\n"
5458 "Do you want to debug the problem?\n\n"
5459 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5460 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5461 "Otherwise, select 'No' to abort...",
5462 os::current_process_id(), os::current_thread_id());
5463
5464 bool yes = os::message_box("Unexpected Error", buf);
5465
5466 if (yes) {
5467 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5468 // exception. If VM is running inside a debugger, the debugger will
5469 // catch the exception. Otherwise, the breakpoint exception will reach
5470 // the default windows exception handler, which can spawn a debugger and
5471 // automatically attach to the dying VM.
5472 os::breakpoint();
5473 yes = false;
5474 }
5475 return yes;
5476 }
5477
5478 void* os::get_default_process_handle() {
5479 return (void*)GetModuleHandle(NULL);
5480 }
5481
5482 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5483 // which is used to find statically linked in agents.
5484 // Additionally for windows, takes into account __stdcall names.
5485 // Parameters:
5486 // sym_name: Symbol in library we are looking for
5487 // lib_name: Name of library to look in, NULL for shared libs.
5488 // is_absolute_path == true if lib_name is absolute path to agent
5489 // such as "C:/a/b/L.dll"
5490 // == false if only the base name of the library is passed in
5491 // such as "L"
5492 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5493 bool is_absolute_path) {
5494 char *agent_entry_name;
5495 size_t len;
5496 size_t name_len;
5497 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5498 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5499 const char *start;
5500
5501 if (lib_name != NULL) {
5502 len = name_len = strlen(lib_name);
5503 if (is_absolute_path) {
5504 // Need to strip path, prefix and suffix
5505 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5506 lib_name = ++start;
5507 } else {
5508 // Need to check for drive prefix
5509 if ((start = strchr(lib_name, ':')) != NULL) {
5510 lib_name = ++start;
5511 }
5512 }
5513 if (len <= (prefix_len + suffix_len)) {
5514 return NULL;
5515 }
5516 lib_name += prefix_len;
5517 name_len = strlen(lib_name) - suffix_len;
5518 }
5519 }
5520 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5521 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5522 if (agent_entry_name == NULL) {
5523 return NULL;
5524 }
5525 if (lib_name != NULL) {
5526 const char *p = strrchr(sym_name, '@');
5527 if (p != NULL && p != sym_name) {
5528 // sym_name == _Agent_OnLoad@XX
5529 strncpy(agent_entry_name, sym_name, (p - sym_name));
5530 agent_entry_name[(p-sym_name)] = '\0';
5531 // agent_entry_name == _Agent_OnLoad
5532 strcat(agent_entry_name, "_");
5533 strncat(agent_entry_name, lib_name, name_len);
5534 strcat(agent_entry_name, p);
5535 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5536 } else {
5537 strcpy(agent_entry_name, sym_name);
5538 strcat(agent_entry_name, "_");
5539 strncat(agent_entry_name, lib_name, name_len);
5540 }
5541 } else {
5542 strcpy(agent_entry_name, sym_name);
5543 }
5544 return agent_entry_name;
5545 }
5546
5547 #ifndef PRODUCT
5548
5549 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5550 // contiguous memory block at a particular address.
5551 // The test first tries to find a good approximate address to allocate at by using the same
5552 // method to allocate some memory at any address. The test then tries to allocate memory in
5553 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5554 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5555 // the previously allocated memory is available for allocation. The only actual failure
5556 // that is reported is when the test tries to allocate at a particular location but gets a
5557 // different valid one. A NULL return value at this point is not considered an error but may
5558 // be legitimate.
5559 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5560 void TestReserveMemorySpecial_test() {
5561 if (!UseLargePages) {
5562 if (VerboseInternalVMTests) {
5563 tty->print("Skipping test because large pages are disabled");
5564 }
5565 return;
5566 }
5567 // save current value of globals
5568 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5569 bool old_use_numa_interleaving = UseNUMAInterleaving;
5570
5571 // set globals to make sure we hit the correct code path
5572 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5573
5574 // do an allocation at an address selected by the OS to get a good one.
5575 const size_t large_allocation_size = os::large_page_size() * 4;
5576 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5577 if (result == NULL) {
5578 if (VerboseInternalVMTests) {
5579 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5580 large_allocation_size);
5581 }
5582 } else {
5583 os::release_memory_special(result, large_allocation_size);
5584
5585 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5586 // we managed to get it once.
5587 const size_t expected_allocation_size = os::large_page_size();
5588 char* expected_location = result + os::large_page_size();
5589 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5590 if (actual_location == NULL) {
5591 if (VerboseInternalVMTests) {
5592 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5593 expected_location, large_allocation_size);
5594 }
5595 } else {
5596 // release memory
5597 os::release_memory_special(actual_location, expected_allocation_size);
5598 // only now check, after releasing any memory to avoid any leaks.
5599 assert(actual_location == expected_location,
5600 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5601 expected_location, expected_allocation_size, actual_location);
5602 }
5603 }
5604
5605 // restore globals
5606 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5607 UseNUMAInterleaving = old_use_numa_interleaving;
5608 }
5609 #endif // PRODUCT
5610
5611 /*
5612 All the defined signal names for Windows.
5613
5614 NOTE that not all of these names are accepted by FindSignal!
5615
5616 For various reasons some of these may be rejected at runtime.
5617
5618 Here are the names currently accepted by a user of sun.misc.Signal with
5619 1.4.1 (ignoring potential interaction with use of chaining, etc):
5620
5621 (LIST TBD)
5622
5623 */
5624 int os::get_signal_number(const char* name) {
5625 static const struct {
5626 char* name;
5627 int number;
5628 } siglabels [] =
5629 // derived from version 6.0 VC98/include/signal.h
5630 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5631 "FPE", SIGFPE, // floating point exception
5632 "SEGV", SIGSEGV, // segment violation
5633 "INT", SIGINT, // interrupt
5634 "TERM", SIGTERM, // software term signal from kill
5635 "BREAK", SIGBREAK, // Ctrl-Break sequence
5636 "ILL", SIGILL}; // illegal instruction
5637 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5638 if (strcmp(name, siglabels[i].name) == 0) {
5639 return siglabels[i].number;
5640 }
5641 }
5642 return -1;
5643 }
5644
5645 // Fast current thread access
5646
5647 int os::win32::_thread_ptr_offset = 0;
5648
5649 static void call_wrapper_dummy() {}
5650
5651 // We need to call the os_exception_wrapper once so that it sets
5652 // up the offset from FS of the thread pointer.
5653 void os::win32::initialize_thread_ptr_offset() {
5654 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5655 NULL, NULL, NULL, NULL);
5656 }