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 "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76
77 #ifdef _DEBUG
78 #include <crtdbg.h>
79 #endif
80
81
82 #include <windows.h>
83 #include <sys/types.h>
84 #include <sys/stat.h>
85 #include <sys/timeb.h>
86 #include <objidl.h>
87 #include <shlobj.h>
88
89 #include <malloc.h>
90 #include <signal.h>
91 #include <direct.h>
92 #include <errno.h>
93 #include <fcntl.h>
94 #include <io.h>
95 #include <process.h> // For _beginthreadex(), _endthreadex()
96 #include <imagehlp.h> // For os::dll_address_to_function_name
97 // for enumerating dll libraries
98 #include <vdmdbg.h>
99
100 // for timer info max values which include all bits
101 #define ALL_64_BITS CONST64(-1)
102
103 // For DLL loading/load error detection
104 // Values of PE COFF
105 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
106 #define IMAGE_FILE_SIGNATURE_LENGTH 4
107
108 static HANDLE main_process;
109 static HANDLE main_thread;
110 static int main_thread_id;
111
112 static FILETIME process_creation_time;
113 static FILETIME process_exit_time;
114 static FILETIME process_user_time;
115 static FILETIME process_kernel_time;
116
117 #ifdef _M_IA64
118 #define __CPU__ ia64
119 #else
120 #ifdef _M_AMD64
121 #define __CPU__ amd64
122 #else
123 #define __CPU__ i486
124 #endif
125 #endif
126
127 // save DLL module handle, used by GetModuleFileName
128
129 HINSTANCE vm_lib_handle;
130
131 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
132 switch (reason) {
133 case DLL_PROCESS_ATTACH:
134 vm_lib_handle = hinst;
135 if (ForceTimeHighResolution) {
136 timeBeginPeriod(1L);
137 }
138 break;
139 case DLL_PROCESS_DETACH:
140 if (ForceTimeHighResolution) {
141 timeEndPeriod(1L);
142 }
143 break;
144 default:
145 break;
146 }
147 return true;
148 }
149
150 static inline double fileTimeAsDouble(FILETIME* time) {
151 const double high = (double) ((unsigned int) ~0);
152 const double split = 10000000.0;
153 double result = (time->dwLowDateTime / split) +
154 time->dwHighDateTime * (high/split);
155 return result;
156 }
157
158 // Implementation of os
159
160 bool os::unsetenv(const char* name) {
161 assert(name != NULL, "Null pointer");
162 return (SetEnvironmentVariable(name, NULL) == TRUE);
163 }
164
165 // No setuid programs under Windows.
166 bool os::have_special_privileges() {
167 return false;
168 }
169
170
171 // This method is a periodic task to check for misbehaving JNI applications
172 // under CheckJNI, we can add any periodic checks here.
173 // For Windows at the moment does nothing
174 void os::run_periodic_checks() {
175 return;
176 }
177
178 // previous UnhandledExceptionFilter, if there is one
179 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
180
181 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
182
183 void os::init_system_properties_values() {
184 // sysclasspath, java_home, dll_dir
185 {
186 char *home_path;
187 char *dll_path;
188 char *pslash;
189 char *bin = "\\bin";
190 char home_dir[MAX_PATH + 1];
191 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
192
193 if (alt_home_dir != NULL) {
194 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
195 home_dir[MAX_PATH] = '\0';
196 } else {
197 os::jvm_path(home_dir, sizeof(home_dir));
198 // Found the full path to jvm.dll.
199 // Now cut the path to <java_home>/jre if we can.
200 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
201 pslash = strrchr(home_dir, '\\');
202 if (pslash != NULL) {
203 *pslash = '\0'; // get rid of \{client|server}
204 pslash = strrchr(home_dir, '\\');
205 if (pslash != NULL) {
206 *pslash = '\0'; // get rid of \bin
207 }
208 }
209 }
210
211 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
212 if (home_path == NULL) {
213 return;
214 }
215 strcpy(home_path, home_dir);
216 Arguments::set_java_home(home_path);
217 FREE_C_HEAP_ARRAY(char, home_path);
218
219 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
220 mtInternal);
221 if (dll_path == NULL) {
222 return;
223 }
224 strcpy(dll_path, home_dir);
225 strcat(dll_path, bin);
226 Arguments::set_dll_dir(dll_path);
227 FREE_C_HEAP_ARRAY(char, dll_path);
228
229 if (!set_boot_path('\\', ';')) {
230 return;
231 }
232 }
233
234 // library_path
235 #define EXT_DIR "\\lib\\ext"
236 #define BIN_DIR "\\bin"
237 #define PACKAGE_DIR "\\Sun\\Java"
238 {
239 // Win32 library search order (See the documentation for LoadLibrary):
240 //
241 // 1. The directory from which application is loaded.
242 // 2. The system wide Java Extensions directory (Java only)
243 // 3. System directory (GetSystemDirectory)
244 // 4. Windows directory (GetWindowsDirectory)
245 // 5. The PATH environment variable
246 // 6. The current directory
247
248 char *library_path;
249 char tmp[MAX_PATH];
250 char *path_str = ::getenv("PATH");
251
252 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
253 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
254
255 library_path[0] = '\0';
256
257 GetModuleFileName(NULL, tmp, sizeof(tmp));
258 *(strrchr(tmp, '\\')) = '\0';
259 strcat(library_path, tmp);
260
261 GetWindowsDirectory(tmp, sizeof(tmp));
262 strcat(library_path, ";");
263 strcat(library_path, tmp);
264 strcat(library_path, PACKAGE_DIR BIN_DIR);
265
266 GetSystemDirectory(tmp, sizeof(tmp));
267 strcat(library_path, ";");
268 strcat(library_path, tmp);
269
270 GetWindowsDirectory(tmp, sizeof(tmp));
271 strcat(library_path, ";");
272 strcat(library_path, tmp);
273
274 if (path_str) {
275 strcat(library_path, ";");
276 strcat(library_path, path_str);
277 }
278
279 strcat(library_path, ";.");
280
281 Arguments::set_library_path(library_path);
282 FREE_C_HEAP_ARRAY(char, library_path);
283 }
284
285 // Default extensions directory
286 {
287 char path[MAX_PATH];
288 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
289 GetWindowsDirectory(path, MAX_PATH);
290 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
291 path, PACKAGE_DIR, EXT_DIR);
292 Arguments::set_ext_dirs(buf);
293 }
294 #undef EXT_DIR
295 #undef BIN_DIR
296 #undef PACKAGE_DIR
297
298 #ifndef _WIN64
299 // set our UnhandledExceptionFilter and save any previous one
300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
301 #endif
302
303 // Done
304 return;
305 }
306
307 void os::breakpoint() {
308 DebugBreak();
309 }
310
311 // Invoked from the BREAKPOINT Macro
312 extern "C" void breakpoint() {
313 os::breakpoint();
314 }
315
316 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
317 // So far, this method is only used by Native Memory Tracking, which is
318 // only supported on Windows XP or later.
319 //
320 int os::get_native_stack(address* stack, int frames, int toSkip) {
321 #ifdef _NMT_NOINLINE_
322 toSkip++;
323 #endif
324 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all newly created threads
412 static unsigned __stdcall thread_native_entry(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 thread->initialize_thread_current();
423
424 OSThread* osthr = thread->osthread();
425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
426
427 if (UseNUMA) {
428 int lgrp_id = os::numa_get_group_id();
429 if (lgrp_id != -1) {
430 thread->set_lgrp_id(lgrp_id);
431 }
432 }
433
434 // Diagnostic code to investigate JDK-6573254
435 int res = 30115; // non-java thread
436 if (thread->is_Java_thread()) {
437 res = 20115; // java thread
438 }
439
440 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
441
442 // Install a win32 structured exception handler around every thread created
443 // by VM, so VM can generate error dump when an exception occurred in non-
444 // Java thread (e.g. VM thread).
445 __try {
446 thread->run();
447 } __except(topLevelExceptionFilter(
448 (_EXCEPTION_POINTERS*)_exception_info())) {
449 // Nothing to do.
450 }
451
452 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
453
454 // One less thread is executing
455 // When the VMThread gets here, the main thread may have already exited
456 // which frees the CodeHeap containing the Atomic::add code
457 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
458 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
459 }
460
461 // If a thread has not deleted itself ("delete this") as part of its
462 // termination sequence, we have to ensure thread-local-storage is
463 // cleared before we actually terminate. No threads should ever be
464 // deleted asynchronously with respect to their termination.
465 if (Thread::current_or_null_safe() != NULL) {
466 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
467 thread->clear_thread_current();
468 }
469
470 // Thread must not return from exit_process_or_thread(), but if it does,
471 // let it proceed to exit normally
472 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
473 }
474
475 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
476 int thread_id) {
477 // Allocate the OSThread object
478 OSThread* osthread = new OSThread(NULL, NULL);
479 if (osthread == NULL) return NULL;
480
481 // Initialize support for Java interrupts
482 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
483 if (interrupt_event == NULL) {
484 delete osthread;
485 return NULL;
486 }
487 osthread->set_interrupt_event(interrupt_event);
488
489 // Store info on the Win32 thread into the OSThread
490 osthread->set_thread_handle(thread_handle);
491 osthread->set_thread_id(thread_id);
492
493 if (UseNUMA) {
494 int lgrp_id = os::numa_get_group_id();
495 if (lgrp_id != -1) {
496 thread->set_lgrp_id(lgrp_id);
497 }
498 }
499
500 // Initial thread state is INITIALIZED, not SUSPENDED
501 osthread->set_state(INITIALIZED);
502
503 return osthread;
504 }
505
506
507 bool os::create_attached_thread(JavaThread* thread) {
508 #ifdef ASSERT
509 thread->verify_not_published();
510 #endif
511 HANDLE thread_h;
512 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
513 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
514 fatal("DuplicateHandle failed\n");
515 }
516 OSThread* osthread = create_os_thread(thread, thread_h,
517 (int)current_thread_id());
518 if (osthread == NULL) {
519 return false;
520 }
521
522 // Initial thread state is RUNNABLE
523 osthread->set_state(RUNNABLE);
524
525 thread->set_osthread(osthread);
526
527 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
528 os::current_thread_id());
529
530 return true;
531 }
532
533 bool os::create_main_thread(JavaThread* thread) {
534 #ifdef ASSERT
535 thread->verify_not_published();
536 #endif
537 if (_starting_thread == NULL) {
538 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
539 if (_starting_thread == NULL) {
540 return false;
541 }
542 }
543
544 // The primordial thread is runnable from the start)
545 _starting_thread->set_state(RUNNABLE);
546
547 thread->set_osthread(_starting_thread);
548 return true;
549 }
550
551 // Helper function to trace _beginthreadex attributes,
552 // similar to os::Posix::describe_pthread_attr()
553 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
554 size_t stacksize, unsigned initflag) {
555 stringStream ss(buf, buflen);
556 if (stacksize == 0) {
557 ss.print("stacksize: default, ");
558 } else {
559 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
560 }
561 ss.print("flags: ");
562 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
563 #define ALL(X) \
564 X(CREATE_SUSPENDED) \
565 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
566 ALL(PRINT_FLAG)
567 #undef ALL
568 #undef PRINT_FLAG
569 return buf;
570 }
571
572 // Allocate and initialize a new OSThread
573 bool os::create_thread(Thread* thread, ThreadType thr_type,
574 size_t stack_size) {
575 unsigned thread_id;
576
577 // Allocate the OSThread object
578 OSThread* osthread = new OSThread(NULL, NULL);
579 if (osthread == NULL) {
580 return false;
581 }
582
583 // Initialize support for Java interrupts
584 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
585 if (interrupt_event == NULL) {
586 delete osthread;
587 return NULL;
588 }
589 osthread->set_interrupt_event(interrupt_event);
590 osthread->set_interrupted(false);
591
592 thread->set_osthread(osthread);
593
594 if (stack_size == 0) {
595 switch (thr_type) {
596 case os::java_thread:
597 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
598 if (JavaThread::stack_size_at_create() > 0) {
599 stack_size = JavaThread::stack_size_at_create();
600 }
601 break;
602 case os::compiler_thread:
603 if (CompilerThreadStackSize > 0) {
604 stack_size = (size_t)(CompilerThreadStackSize * K);
605 break;
606 } // else fall through:
607 // use VMThreadStackSize if CompilerThreadStackSize is not defined
608 case os::vm_thread:
609 case os::pgc_thread:
610 case os::cgc_thread:
611 case os::watcher_thread:
612 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
613 break;
614 }
615 }
616
617 // Create the Win32 thread
618 //
619 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
620 // does not specify stack size. Instead, it specifies the size of
621 // initially committed space. The stack size is determined by
622 // PE header in the executable. If the committed "stack_size" is larger
623 // than default value in the PE header, the stack is rounded up to the
624 // nearest multiple of 1MB. For example if the launcher has default
625 // stack size of 320k, specifying any size less than 320k does not
626 // affect the actual stack size at all, it only affects the initial
627 // commitment. On the other hand, specifying 'stack_size' larger than
628 // default value may cause significant increase in memory usage, because
629 // not only the stack space will be rounded up to MB, but also the
630 // entire space is committed upfront.
631 //
632 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
633 // for CreateThread() that can treat 'stack_size' as stack size. However we
634 // are not supposed to call CreateThread() directly according to MSDN
635 // document because JVM uses C runtime library. The good news is that the
636 // flag appears to work with _beginthredex() as well.
637
638 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
639 HANDLE thread_handle =
640 (HANDLE)_beginthreadex(NULL,
641 (unsigned)stack_size,
642 (unsigned (__stdcall *)(void*)) thread_native_entry,
643 thread,
644 initflag,
645 &thread_id);
646
647 char buf[64];
648 if (thread_handle != NULL) {
649 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
650 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
651 } else {
652 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
653 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
654 }
655
656 if (thread_handle == NULL) {
657 // Need to clean up stuff we've allocated so far
658 CloseHandle(osthread->interrupt_event());
659 thread->set_osthread(NULL);
660 delete osthread;
661 return NULL;
662 }
663
664 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
665
666 // Store info on the Win32 thread into the OSThread
667 osthread->set_thread_handle(thread_handle);
668 osthread->set_thread_id(thread_id);
669
670 // Initial thread state is INITIALIZED, not SUSPENDED
671 osthread->set_state(INITIALIZED);
672
673 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
674 return true;
675 }
676
677
678 // Free Win32 resources related to the OSThread
679 void os::free_thread(OSThread* osthread) {
680 assert(osthread != NULL, "osthread not set");
681
682 // We are told to free resources of the argument thread,
683 // but we can only really operate on the current thread.
684 assert(Thread::current()->osthread() == osthread,
685 "os::free_thread but not current thread");
686
687 CloseHandle(osthread->thread_handle());
688 CloseHandle(osthread->interrupt_event());
689 delete osthread;
690 }
691
692 static jlong first_filetime;
693 static jlong initial_performance_count;
694 static jlong performance_frequency;
695
696
697 jlong as_long(LARGE_INTEGER x) {
698 jlong result = 0; // initialization to avoid warning
699 set_high(&result, x.HighPart);
700 set_low(&result, x.LowPart);
701 return result;
702 }
703
704
705 jlong os::elapsed_counter() {
706 LARGE_INTEGER count;
707 QueryPerformanceCounter(&count);
708 return as_long(count) - initial_performance_count;
709 }
710
711
712 jlong os::elapsed_frequency() {
713 return performance_frequency;
714 }
715
716
717 julong os::available_memory() {
718 return win32::available_memory();
719 }
720
721 julong os::win32::available_memory() {
722 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
723 // value if total memory is larger than 4GB
724 MEMORYSTATUSEX ms;
725 ms.dwLength = sizeof(ms);
726 GlobalMemoryStatusEx(&ms);
727
728 return (julong)ms.ullAvailPhys;
729 }
730
731 julong os::physical_memory() {
732 return win32::physical_memory();
733 }
734
735 bool os::has_allocatable_memory_limit(julong* limit) {
736 MEMORYSTATUSEX ms;
737 ms.dwLength = sizeof(ms);
738 GlobalMemoryStatusEx(&ms);
739 #ifdef _LP64
740 *limit = (julong)ms.ullAvailVirtual;
741 return true;
742 #else
743 // Limit to 1400m because of the 2gb address space wall
744 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
745 return true;
746 #endif
747 }
748
749 int os::active_processor_count() {
750 DWORD_PTR lpProcessAffinityMask = 0;
751 DWORD_PTR lpSystemAffinityMask = 0;
752 int proc_count = processor_count();
753 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
754 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
755 // Nof active processors is number of bits in process affinity mask
756 int bitcount = 0;
757 while (lpProcessAffinityMask != 0) {
758 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
759 bitcount++;
760 }
761 return bitcount;
762 } else {
763 return proc_count;
764 }
765 }
766
767 void os::set_native_thread_name(const char *name) {
768
769 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
770 //
771 // Note that unfortunately this only works if the process
772 // is already attached to a debugger; debugger must observe
773 // the exception below to show the correct name.
774
775 const DWORD MS_VC_EXCEPTION = 0x406D1388;
776 struct {
777 DWORD dwType; // must be 0x1000
778 LPCSTR szName; // pointer to name (in user addr space)
779 DWORD dwThreadID; // thread ID (-1=caller thread)
780 DWORD dwFlags; // reserved for future use, must be zero
781 } info;
782
783 info.dwType = 0x1000;
784 info.szName = name;
785 info.dwThreadID = -1;
786 info.dwFlags = 0;
787
788 __try {
789 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
790 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
791 }
792
793 bool os::distribute_processes(uint length, uint* distribution) {
794 // Not yet implemented.
795 return false;
796 }
797
798 bool os::bind_to_processor(uint processor_id) {
799 // Not yet implemented.
800 return false;
801 }
802
803 void os::win32::initialize_performance_counter() {
804 LARGE_INTEGER count;
805 QueryPerformanceFrequency(&count);
806 performance_frequency = as_long(count);
807 QueryPerformanceCounter(&count);
808 initial_performance_count = as_long(count);
809 }
810
811
812 double os::elapsedTime() {
813 return (double) elapsed_counter() / (double) elapsed_frequency();
814 }
815
816
817 // Windows format:
818 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
819 // Java format:
820 // Java standards require the number of milliseconds since 1/1/1970
821
822 // Constant offset - calculated using offset()
823 static jlong _offset = 116444736000000000;
824 // Fake time counter for reproducible results when debugging
825 static jlong fake_time = 0;
826
827 #ifdef ASSERT
828 // Just to be safe, recalculate the offset in debug mode
829 static jlong _calculated_offset = 0;
830 static int _has_calculated_offset = 0;
831
832 jlong offset() {
833 if (_has_calculated_offset) return _calculated_offset;
834 SYSTEMTIME java_origin;
835 java_origin.wYear = 1970;
836 java_origin.wMonth = 1;
837 java_origin.wDayOfWeek = 0; // ignored
838 java_origin.wDay = 1;
839 java_origin.wHour = 0;
840 java_origin.wMinute = 0;
841 java_origin.wSecond = 0;
842 java_origin.wMilliseconds = 0;
843 FILETIME jot;
844 if (!SystemTimeToFileTime(&java_origin, &jot)) {
845 fatal("Error = %d\nWindows error", GetLastError());
846 }
847 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
848 _has_calculated_offset = 1;
849 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
850 return _calculated_offset;
851 }
852 #else
853 jlong offset() {
854 return _offset;
855 }
856 #endif
857
858 jlong windows_to_java_time(FILETIME wt) {
859 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
860 return (a - offset()) / 10000;
861 }
862
863 // Returns time ticks in (10th of micro seconds)
864 jlong windows_to_time_ticks(FILETIME wt) {
865 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
866 return (a - offset());
867 }
868
869 FILETIME java_to_windows_time(jlong l) {
870 jlong a = (l * 10000) + offset();
871 FILETIME result;
872 result.dwHighDateTime = high(a);
873 result.dwLowDateTime = low(a);
874 return result;
875 }
876
877 bool os::supports_vtime() { return true; }
878 bool os::enable_vtime() { return false; }
879 bool os::vtime_enabled() { return false; }
880
881 double os::elapsedVTime() {
882 FILETIME created;
883 FILETIME exited;
884 FILETIME kernel;
885 FILETIME user;
886 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
887 // the resolution of windows_to_java_time() should be sufficient (ms)
888 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
889 } else {
890 return elapsedTime();
891 }
892 }
893
894 jlong os::javaTimeMillis() {
895 if (UseFakeTimers) {
896 return fake_time++;
897 } else {
898 FILETIME wt;
899 GetSystemTimeAsFileTime(&wt);
900 return windows_to_java_time(wt);
901 }
902 }
903
904 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
905 FILETIME wt;
906 GetSystemTimeAsFileTime(&wt);
907 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
908 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
909 seconds = secs;
910 nanos = jlong(ticks - (secs*10000000)) * 100;
911 }
912
913 jlong os::javaTimeNanos() {
914 LARGE_INTEGER current_count;
915 QueryPerformanceCounter(¤t_count);
916 double current = as_long(current_count);
917 double freq = performance_frequency;
918 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
919 return time;
920 }
921
922 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
923 jlong freq = performance_frequency;
924 if (freq < NANOSECS_PER_SEC) {
925 // the performance counter is 64 bits and we will
926 // be multiplying it -- so no wrap in 64 bits
927 info_ptr->max_value = ALL_64_BITS;
928 } else if (freq > NANOSECS_PER_SEC) {
929 // use the max value the counter can reach to
930 // determine the max value which could be returned
931 julong max_counter = (julong)ALL_64_BITS;
932 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
933 } else {
934 // the performance counter is 64 bits and we will
935 // be using it directly -- so no wrap in 64 bits
936 info_ptr->max_value = ALL_64_BITS;
937 }
938
939 // using a counter, so no skipping
940 info_ptr->may_skip_backward = false;
941 info_ptr->may_skip_forward = false;
942
943 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
944 }
945
946 char* os::local_time_string(char *buf, size_t buflen) {
947 SYSTEMTIME st;
948 GetLocalTime(&st);
949 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
950 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
951 return buf;
952 }
953
954 bool os::getTimesSecs(double* process_real_time,
955 double* process_user_time,
956 double* process_system_time) {
957 HANDLE h_process = GetCurrentProcess();
958 FILETIME create_time, exit_time, kernel_time, user_time;
959 BOOL result = GetProcessTimes(h_process,
960 &create_time,
961 &exit_time,
962 &kernel_time,
963 &user_time);
964 if (result != 0) {
965 FILETIME wt;
966 GetSystemTimeAsFileTime(&wt);
967 jlong rtc_millis = windows_to_java_time(wt);
968 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
969 *process_user_time =
970 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
971 *process_system_time =
972 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
973 return true;
974 } else {
975 return false;
976 }
977 }
978
979 void os::shutdown() {
980 // allow PerfMemory to attempt cleanup of any persistent resources
981 perfMemory_exit();
982
983 // flush buffered output, finish log files
984 ostream_abort();
985
986 // Check for abort hook
987 abort_hook_t abort_hook = Arguments::abort_hook();
988 if (abort_hook != NULL) {
989 abort_hook();
990 }
991 }
992
993
994 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
995 PMINIDUMP_EXCEPTION_INFORMATION,
996 PMINIDUMP_USER_STREAM_INFORMATION,
997 PMINIDUMP_CALLBACK_INFORMATION);
998
999 static HANDLE dumpFile = NULL;
1000
1001 // Check if dump file can be created.
1002 void os::check_dump_limit(char* buffer, size_t buffsz) {
1003 bool status = true;
1004 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1005 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1006 status = false;
1007 }
1008
1009 #ifndef ASSERT
1010 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1011 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1012 status = false;
1013 }
1014 #endif
1015
1016 if (status) {
1017 const char* cwd = get_current_directory(NULL, 0);
1018 int pid = current_process_id();
1019 if (cwd != NULL) {
1020 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1021 } else {
1022 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1023 }
1024
1025 if (dumpFile == NULL &&
1026 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1027 == INVALID_HANDLE_VALUE) {
1028 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1029 status = false;
1030 }
1031 }
1032 VMError::record_coredump_status(buffer, status);
1033 }
1034
1035 void os::abort(bool dump_core, void* siginfo, const void* context) {
1036 HINSTANCE dbghelp;
1037 EXCEPTION_POINTERS ep;
1038 MINIDUMP_EXCEPTION_INFORMATION mei;
1039 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1040
1041 HANDLE hProcess = GetCurrentProcess();
1042 DWORD processId = GetCurrentProcessId();
1043 MINIDUMP_TYPE dumpType;
1044
1045 shutdown();
1046 if (!dump_core || dumpFile == NULL) {
1047 if (dumpFile != NULL) {
1048 CloseHandle(dumpFile);
1049 }
1050 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1051 }
1052
1053 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1054
1055 if (dbghelp == NULL) {
1056 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1057 CloseHandle(dumpFile);
1058 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1059 }
1060
1061 _MiniDumpWriteDump =
1062 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1063 PMINIDUMP_EXCEPTION_INFORMATION,
1064 PMINIDUMP_USER_STREAM_INFORMATION,
1065 PMINIDUMP_CALLBACK_INFORMATION),
1066 GetProcAddress(dbghelp,
1067 "MiniDumpWriteDump"));
1068
1069 if (_MiniDumpWriteDump == NULL) {
1070 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1071 CloseHandle(dumpFile);
1072 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1073 }
1074
1075 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1076 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1077
1078 if (siginfo != NULL && context != NULL) {
1079 ep.ContextRecord = (PCONTEXT) context;
1080 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1081
1082 mei.ThreadId = GetCurrentThreadId();
1083 mei.ExceptionPointers = &ep;
1084 pmei = &mei;
1085 } else {
1086 pmei = NULL;
1087 }
1088
1089 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1090 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1091 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1092 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1093 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1094 }
1095 CloseHandle(dumpFile);
1096 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1097 }
1098
1099 // Die immediately, no exit hook, no abort hook, no cleanup.
1100 void os::die() {
1101 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1102 }
1103
1104 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1105 // * dirent_md.c 1.15 00/02/02
1106 //
1107 // The declarations for DIR and struct dirent are in jvm_win32.h.
1108
1109 // Caller must have already run dirname through JVM_NativePath, which removes
1110 // duplicate slashes and converts all instances of '/' into '\\'.
1111
1112 DIR * os::opendir(const char *dirname) {
1113 assert(dirname != NULL, "just checking"); // hotspot change
1114 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1115 DWORD fattr; // hotspot change
1116 char alt_dirname[4] = { 0, 0, 0, 0 };
1117
1118 if (dirp == 0) {
1119 errno = ENOMEM;
1120 return 0;
1121 }
1122
1123 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1124 // as a directory in FindFirstFile(). We detect this case here and
1125 // prepend the current drive name.
1126 //
1127 if (dirname[1] == '\0' && dirname[0] == '\\') {
1128 alt_dirname[0] = _getdrive() + 'A' - 1;
1129 alt_dirname[1] = ':';
1130 alt_dirname[2] = '\\';
1131 alt_dirname[3] = '\0';
1132 dirname = alt_dirname;
1133 }
1134
1135 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1136 if (dirp->path == 0) {
1137 free(dirp);
1138 errno = ENOMEM;
1139 return 0;
1140 }
1141 strcpy(dirp->path, dirname);
1142
1143 fattr = GetFileAttributes(dirp->path);
1144 if (fattr == 0xffffffff) {
1145 free(dirp->path);
1146 free(dirp);
1147 errno = ENOENT;
1148 return 0;
1149 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1150 free(dirp->path);
1151 free(dirp);
1152 errno = ENOTDIR;
1153 return 0;
1154 }
1155
1156 // Append "*.*", or possibly "\\*.*", to path
1157 if (dirp->path[1] == ':' &&
1158 (dirp->path[2] == '\0' ||
1159 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1160 // No '\\' needed for cases like "Z:" or "Z:\"
1161 strcat(dirp->path, "*.*");
1162 } else {
1163 strcat(dirp->path, "\\*.*");
1164 }
1165
1166 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1167 if (dirp->handle == INVALID_HANDLE_VALUE) {
1168 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1169 free(dirp->path);
1170 free(dirp);
1171 errno = EACCES;
1172 return 0;
1173 }
1174 }
1175 return dirp;
1176 }
1177
1178 // parameter dbuf unused on Windows
1179 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1180 assert(dirp != NULL, "just checking"); // hotspot change
1181 if (dirp->handle == INVALID_HANDLE_VALUE) {
1182 return 0;
1183 }
1184
1185 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1186
1187 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1188 if (GetLastError() == ERROR_INVALID_HANDLE) {
1189 errno = EBADF;
1190 return 0;
1191 }
1192 FindClose(dirp->handle);
1193 dirp->handle = INVALID_HANDLE_VALUE;
1194 }
1195
1196 return &dirp->dirent;
1197 }
1198
1199 int os::closedir(DIR *dirp) {
1200 assert(dirp != NULL, "just checking"); // hotspot change
1201 if (dirp->handle != INVALID_HANDLE_VALUE) {
1202 if (!FindClose(dirp->handle)) {
1203 errno = EBADF;
1204 return -1;
1205 }
1206 dirp->handle = INVALID_HANDLE_VALUE;
1207 }
1208 free(dirp->path);
1209 free(dirp);
1210 return 0;
1211 }
1212
1213 // This must be hard coded because it's the system's temporary
1214 // directory not the java application's temp directory, ala java.io.tmpdir.
1215 const char* os::get_temp_directory() {
1216 static char path_buf[MAX_PATH];
1217 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1218 return path_buf;
1219 } else {
1220 path_buf[0] = '\0';
1221 return path_buf;
1222 }
1223 }
1224
1225 static bool file_exists(const char* filename) {
1226 if (filename == NULL || strlen(filename) == 0) {
1227 return false;
1228 }
1229 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1230 }
1231
1232 bool os::dll_build_name(char *buffer, size_t buflen,
1233 const char* pname, const char* fname) {
1234 bool retval = false;
1235 const size_t pnamelen = pname ? strlen(pname) : 0;
1236 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1237
1238 // Return error on buffer overflow.
1239 if (pnamelen + strlen(fname) + 10 > buflen) {
1240 return retval;
1241 }
1242
1243 if (pnamelen == 0) {
1244 jio_snprintf(buffer, buflen, "%s.dll", fname);
1245 retval = true;
1246 } else if (c == ':' || c == '\\') {
1247 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1248 retval = true;
1249 } else if (strchr(pname, *os::path_separator()) != NULL) {
1250 int n;
1251 char** pelements = split_path(pname, &n);
1252 if (pelements == NULL) {
1253 return false;
1254 }
1255 for (int i = 0; i < n; i++) {
1256 char* path = pelements[i];
1257 // Really shouldn't be NULL, but check can't hurt
1258 size_t plen = (path == NULL) ? 0 : strlen(path);
1259 if (plen == 0) {
1260 continue; // skip the empty path values
1261 }
1262 const char lastchar = path[plen - 1];
1263 if (lastchar == ':' || lastchar == '\\') {
1264 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1265 } else {
1266 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1267 }
1268 if (file_exists(buffer)) {
1269 retval = true;
1270 break;
1271 }
1272 }
1273 // release the storage
1274 for (int i = 0; i < n; i++) {
1275 if (pelements[i] != NULL) {
1276 FREE_C_HEAP_ARRAY(char, pelements[i]);
1277 }
1278 }
1279 if (pelements != NULL) {
1280 FREE_C_HEAP_ARRAY(char*, pelements);
1281 }
1282 } else {
1283 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1284 retval = true;
1285 }
1286 return retval;
1287 }
1288
1289 // Needs to be in os specific directory because windows requires another
1290 // header file <direct.h>
1291 const char* os::get_current_directory(char *buf, size_t buflen) {
1292 int n = static_cast<int>(buflen);
1293 if (buflen > INT_MAX) n = INT_MAX;
1294 return _getcwd(buf, n);
1295 }
1296
1297 //-----------------------------------------------------------
1298 // Helper functions for fatal error handler
1299 #ifdef _WIN64
1300 // Helper routine which returns true if address in
1301 // within the NTDLL address space.
1302 //
1303 static bool _addr_in_ntdll(address addr) {
1304 HMODULE hmod;
1305 MODULEINFO minfo;
1306
1307 hmod = GetModuleHandle("NTDLL.DLL");
1308 if (hmod == NULL) return false;
1309 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1310 &minfo, sizeof(MODULEINFO))) {
1311 return false;
1312 }
1313
1314 if ((addr >= minfo.lpBaseOfDll) &&
1315 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1316 return true;
1317 } else {
1318 return false;
1319 }
1320 }
1321 #endif
1322
1323 struct _modinfo {
1324 address addr;
1325 char* full_path; // point to a char buffer
1326 int buflen; // size of the buffer
1327 address base_addr;
1328 };
1329
1330 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1331 address top_address, void * param) {
1332 struct _modinfo *pmod = (struct _modinfo *)param;
1333 if (!pmod) return -1;
1334
1335 if (base_addr <= pmod->addr &&
1336 top_address > pmod->addr) {
1337 // if a buffer is provided, copy path name to the buffer
1338 if (pmod->full_path) {
1339 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1340 }
1341 pmod->base_addr = base_addr;
1342 return 1;
1343 }
1344 return 0;
1345 }
1346
1347 bool os::dll_address_to_library_name(address addr, char* buf,
1348 int buflen, int* offset) {
1349 // buf is not optional, but offset is optional
1350 assert(buf != NULL, "sanity check");
1351
1352 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1353 // return the full path to the DLL file, sometimes it returns path
1354 // to the corresponding PDB file (debug info); sometimes it only
1355 // returns partial path, which makes life painful.
1356
1357 struct _modinfo mi;
1358 mi.addr = addr;
1359 mi.full_path = buf;
1360 mi.buflen = buflen;
1361 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1362 // buf already contains path name
1363 if (offset) *offset = addr - mi.base_addr;
1364 return true;
1365 }
1366
1367 buf[0] = '\0';
1368 if (offset) *offset = -1;
1369 return false;
1370 }
1371
1372 bool os::dll_address_to_function_name(address addr, char *buf,
1373 int buflen, int *offset,
1374 bool demangle) {
1375 // buf is not optional, but offset is optional
1376 assert(buf != NULL, "sanity check");
1377
1378 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1379 return true;
1380 }
1381 if (offset != NULL) *offset = -1;
1382 buf[0] = '\0';
1383 return false;
1384 }
1385
1386 // save the start and end address of jvm.dll into param[0] and param[1]
1387 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1388 address top_address, void * param) {
1389 if (!param) return -1;
1390
1391 if (base_addr <= (address)_locate_jvm_dll &&
1392 top_address > (address)_locate_jvm_dll) {
1393 ((address*)param)[0] = base_addr;
1394 ((address*)param)[1] = top_address;
1395 return 1;
1396 }
1397 return 0;
1398 }
1399
1400 address vm_lib_location[2]; // start and end address of jvm.dll
1401
1402 // check if addr is inside jvm.dll
1403 bool os::address_is_in_vm(address addr) {
1404 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1405 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1406 assert(false, "Can't find jvm module.");
1407 return false;
1408 }
1409 }
1410
1411 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1412 }
1413
1414 // print module info; param is outputStream*
1415 static int _print_module(const char* fname, address base_address,
1416 address top_address, void* param) {
1417 if (!param) return -1;
1418
1419 outputStream* st = (outputStream*)param;
1420
1421 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1422 return 0;
1423 }
1424
1425 // Loads .dll/.so and
1426 // in case of error it checks if .dll/.so was built for the
1427 // same architecture as Hotspot is running on
1428 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1429 void * result = LoadLibrary(name);
1430 if (result != NULL) {
1431 return result;
1432 }
1433
1434 DWORD errcode = GetLastError();
1435 if (errcode == ERROR_MOD_NOT_FOUND) {
1436 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1437 ebuf[ebuflen - 1] = '\0';
1438 return NULL;
1439 }
1440
1441 // Parsing dll below
1442 // If we can read dll-info and find that dll was built
1443 // for an architecture other than Hotspot is running in
1444 // - then print to buffer "DLL was built for a different architecture"
1445 // else call os::lasterror to obtain system error message
1446
1447 // Read system error message into ebuf
1448 // It may or may not be overwritten below (in the for loop and just above)
1449 lasterror(ebuf, (size_t) ebuflen);
1450 ebuf[ebuflen - 1] = '\0';
1451 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1452 if (fd < 0) {
1453 return NULL;
1454 }
1455
1456 uint32_t signature_offset;
1457 uint16_t lib_arch = 0;
1458 bool failed_to_get_lib_arch =
1459 ( // Go to position 3c in the dll
1460 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1461 ||
1462 // Read location of signature
1463 (sizeof(signature_offset) !=
1464 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1465 ||
1466 // Go to COFF File Header in dll
1467 // that is located after "signature" (4 bytes long)
1468 (os::seek_to_file_offset(fd,
1469 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1470 ||
1471 // Read field that contains code of architecture
1472 // that dll was built for
1473 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1474 );
1475
1476 ::close(fd);
1477 if (failed_to_get_lib_arch) {
1478 // file i/o error - report os::lasterror(...) msg
1479 return NULL;
1480 }
1481
1482 typedef struct {
1483 uint16_t arch_code;
1484 char* arch_name;
1485 } arch_t;
1486
1487 static const arch_t arch_array[] = {
1488 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1489 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1490 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1491 };
1492 #if (defined _M_IA64)
1493 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1494 #elif (defined _M_AMD64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1496 #elif (defined _M_IX86)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1498 #else
1499 #error Method os::dll_load requires that one of following \
1500 is defined :_M_IA64,_M_AMD64 or _M_IX86
1501 #endif
1502
1503
1504 // Obtain a string for printf operation
1505 // lib_arch_str shall contain string what platform this .dll was built for
1506 // running_arch_str shall string contain what platform Hotspot was built for
1507 char *running_arch_str = NULL, *lib_arch_str = NULL;
1508 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1509 if (lib_arch == arch_array[i].arch_code) {
1510 lib_arch_str = arch_array[i].arch_name;
1511 }
1512 if (running_arch == arch_array[i].arch_code) {
1513 running_arch_str = arch_array[i].arch_name;
1514 }
1515 }
1516
1517 assert(running_arch_str,
1518 "Didn't find running architecture code in arch_array");
1519
1520 // If the architecture is right
1521 // but some other error took place - report os::lasterror(...) msg
1522 if (lib_arch == running_arch) {
1523 return NULL;
1524 }
1525
1526 if (lib_arch_str != NULL) {
1527 ::_snprintf(ebuf, ebuflen - 1,
1528 "Can't load %s-bit .dll on a %s-bit platform",
1529 lib_arch_str, running_arch_str);
1530 } else {
1531 // don't know what architecture this dll was build for
1532 ::_snprintf(ebuf, ebuflen - 1,
1533 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1534 lib_arch, running_arch_str);
1535 }
1536
1537 return NULL;
1538 }
1539
1540 void os::print_dll_info(outputStream *st) {
1541 st->print_cr("Dynamic libraries:");
1542 get_loaded_modules_info(_print_module, (void *)st);
1543 }
1544
1545 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1546 HANDLE hProcess;
1547
1548 # define MAX_NUM_MODULES 128
1549 HMODULE modules[MAX_NUM_MODULES];
1550 static char filename[MAX_PATH];
1551 int result = 0;
1552
1553 int pid = os::current_process_id();
1554 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1555 FALSE, pid);
1556 if (hProcess == NULL) return 0;
1557
1558 DWORD size_needed;
1559 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1560 CloseHandle(hProcess);
1561 return 0;
1562 }
1563
1564 // number of modules that are currently loaded
1565 int num_modules = size_needed / sizeof(HMODULE);
1566
1567 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1568 // Get Full pathname:
1569 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1570 filename[0] = '\0';
1571 }
1572
1573 MODULEINFO modinfo;
1574 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1575 modinfo.lpBaseOfDll = NULL;
1576 modinfo.SizeOfImage = 0;
1577 }
1578
1579 // Invoke callback function
1580 result = callback(filename, (address)modinfo.lpBaseOfDll,
1581 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1582 if (result) break;
1583 }
1584
1585 CloseHandle(hProcess);
1586 return result;
1587 }
1588
1589 bool os::get_host_name(char* buf, size_t buflen) {
1590 DWORD size = (DWORD)buflen;
1591 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1592 }
1593
1594 void os::get_summary_os_info(char* buf, size_t buflen) {
1595 stringStream sst(buf, buflen);
1596 os::win32::print_windows_version(&sst);
1597 // chop off newline character
1598 char* nl = strchr(buf, '\n');
1599 if (nl != NULL) *nl = '\0';
1600 }
1601
1602 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1603 int ret = vsnprintf(buf, len, fmt, args);
1604 // Get the correct buffer size if buf is too small
1605 if (ret < 0) {
1606 return _vscprintf(fmt, args);
1607 }
1608 return ret;
1609 }
1610
1611 static inline time_t get_mtime(const char* filename) {
1612 struct stat st;
1613 int ret = os::stat(filename, &st);
1614 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1615 return st.st_mtime;
1616 }
1617
1618 int os::compare_file_modified_times(const char* file1, const char* file2) {
1619 time_t t1 = get_mtime(file1);
1620 time_t t2 = get_mtime(file2);
1621 return t1 - t2;
1622 }
1623
1624 void os::print_os_info_brief(outputStream* st) {
1625 os::print_os_info(st);
1626 }
1627
1628 void os::print_os_info(outputStream* st) {
1629 #ifdef ASSERT
1630 char buffer[1024];
1631 st->print("HostName: ");
1632 if (get_host_name(buffer, sizeof(buffer))) {
1633 st->print("%s ", buffer);
1634 } else {
1635 st->print("N/A ");
1636 }
1637 #endif
1638 st->print("OS:");
1639 os::win32::print_windows_version(st);
1640 }
1641
1642 void os::win32::print_windows_version(outputStream* st) {
1643 OSVERSIONINFOEX osvi;
1644 VS_FIXEDFILEINFO *file_info;
1645 TCHAR kernel32_path[MAX_PATH];
1646 UINT len, ret;
1647
1648 // Use the GetVersionEx information to see if we're on a server or
1649 // workstation edition of Windows. Starting with Windows 8.1 we can't
1650 // trust the OS version information returned by this API.
1651 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1652 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1653 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1654 st->print_cr("Call to GetVersionEx failed");
1655 return;
1656 }
1657 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1658
1659 // Get the full path to \Windows\System32\kernel32.dll and use that for
1660 // determining what version of Windows we're running on.
1661 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1662 ret = GetSystemDirectory(kernel32_path, len);
1663 if (ret == 0 || ret > len) {
1664 st->print_cr("Call to GetSystemDirectory failed");
1665 return;
1666 }
1667 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1668
1669 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1670 if (version_size == 0) {
1671 st->print_cr("Call to GetFileVersionInfoSize failed");
1672 return;
1673 }
1674
1675 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1676 if (version_info == NULL) {
1677 st->print_cr("Failed to allocate version_info");
1678 return;
1679 }
1680
1681 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1682 os::free(version_info);
1683 st->print_cr("Call to GetFileVersionInfo failed");
1684 return;
1685 }
1686
1687 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1688 os::free(version_info);
1689 st->print_cr("Call to VerQueryValue failed");
1690 return;
1691 }
1692
1693 int major_version = HIWORD(file_info->dwProductVersionMS);
1694 int minor_version = LOWORD(file_info->dwProductVersionMS);
1695 int build_number = HIWORD(file_info->dwProductVersionLS);
1696 int build_minor = LOWORD(file_info->dwProductVersionLS);
1697 int os_vers = major_version * 1000 + minor_version;
1698 os::free(version_info);
1699
1700 st->print(" Windows ");
1701 switch (os_vers) {
1702
1703 case 6000:
1704 if (is_workstation) {
1705 st->print("Vista");
1706 } else {
1707 st->print("Server 2008");
1708 }
1709 break;
1710
1711 case 6001:
1712 if (is_workstation) {
1713 st->print("7");
1714 } else {
1715 st->print("Server 2008 R2");
1716 }
1717 break;
1718
1719 case 6002:
1720 if (is_workstation) {
1721 st->print("8");
1722 } else {
1723 st->print("Server 2012");
1724 }
1725 break;
1726
1727 case 6003:
1728 if (is_workstation) {
1729 st->print("8.1");
1730 } else {
1731 st->print("Server 2012 R2");
1732 }
1733 break;
1734
1735 case 10000:
1736 if (is_workstation) {
1737 st->print("10");
1738 } else {
1739 st->print("Server 2016");
1740 }
1741 break;
1742
1743 default:
1744 // Unrecognized windows, print out its major and minor versions
1745 st->print("%d.%d", major_version, minor_version);
1746 break;
1747 }
1748
1749 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1750 // find out whether we are running on 64 bit processor or not
1751 SYSTEM_INFO si;
1752 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1753 GetNativeSystemInfo(&si);
1754 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1755 st->print(" , 64 bit");
1756 }
1757
1758 st->print(" Build %d", build_number);
1759 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1760 st->cr();
1761 }
1762
1763 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1764 // Nothing to do for now.
1765 }
1766
1767 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1768 HKEY key;
1769 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1770 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1771 if (status == ERROR_SUCCESS) {
1772 DWORD size = (DWORD)buflen;
1773 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1774 if (status != ERROR_SUCCESS) {
1775 strncpy(buf, "## __CPU__", buflen);
1776 }
1777 RegCloseKey(key);
1778 } else {
1779 // Put generic cpu info to return
1780 strncpy(buf, "## __CPU__", buflen);
1781 }
1782 }
1783
1784 void os::print_memory_info(outputStream* st) {
1785 st->print("Memory:");
1786 st->print(" %dk page", os::vm_page_size()>>10);
1787
1788 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1789 // value if total memory is larger than 4GB
1790 MEMORYSTATUSEX ms;
1791 ms.dwLength = sizeof(ms);
1792 GlobalMemoryStatusEx(&ms);
1793
1794 st->print(", physical %uk", os::physical_memory() >> 10);
1795 st->print("(%uk free)", os::available_memory() >> 10);
1796
1797 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1798 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1799 st->cr();
1800 }
1801
1802 void os::print_siginfo(outputStream *st, const void* siginfo) {
1803 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1804 st->print("siginfo:");
1805
1806 char tmp[64];
1807 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1808 strcpy(tmp, "EXCEPTION_??");
1809 }
1810 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1811
1812 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1813 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1814 er->NumberParameters >= 2) {
1815 switch (er->ExceptionInformation[0]) {
1816 case 0: st->print(", reading address"); break;
1817 case 1: st->print(", writing address"); break;
1818 case 8: st->print(", data execution prevention violation at address"); break;
1819 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1820 er->ExceptionInformation[0]);
1821 }
1822 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1823 } else {
1824 int num = er->NumberParameters;
1825 if (num > 0) {
1826 st->print(", ExceptionInformation=");
1827 for (int i = 0; i < num; i++) {
1828 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1829 }
1830 }
1831 }
1832 st->cr();
1833 }
1834
1835 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1836 // do nothing
1837 }
1838
1839 static char saved_jvm_path[MAX_PATH] = {0};
1840
1841 // Find the full path to the current module, jvm.dll
1842 void os::jvm_path(char *buf, jint buflen) {
1843 // Error checking.
1844 if (buflen < MAX_PATH) {
1845 assert(false, "must use a large-enough buffer");
1846 buf[0] = '\0';
1847 return;
1848 }
1849 // Lazy resolve the path to current module.
1850 if (saved_jvm_path[0] != 0) {
1851 strcpy(buf, saved_jvm_path);
1852 return;
1853 }
1854
1855 buf[0] = '\0';
1856 if (Arguments::sun_java_launcher_is_altjvm()) {
1857 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1858 // for a JAVA_HOME environment variable and fix up the path so it
1859 // looks like jvm.dll is installed there (append a fake suffix
1860 // hotspot/jvm.dll).
1861 char* java_home_var = ::getenv("JAVA_HOME");
1862 if (java_home_var != NULL && java_home_var[0] != 0 &&
1863 strlen(java_home_var) < (size_t)buflen) {
1864 strncpy(buf, java_home_var, buflen);
1865
1866 // determine if this is a legacy image or modules image
1867 // modules image doesn't have "jre" subdirectory
1868 size_t len = strlen(buf);
1869 char* jrebin_p = buf + len;
1870 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1871 if (0 != _access(buf, 0)) {
1872 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1873 }
1874 len = strlen(buf);
1875 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1876 }
1877 }
1878
1879 if (buf[0] == '\0') {
1880 GetModuleFileName(vm_lib_handle, buf, buflen);
1881 }
1882 strncpy(saved_jvm_path, buf, MAX_PATH);
1883 saved_jvm_path[MAX_PATH - 1] = '\0';
1884 }
1885
1886
1887 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1888 #ifndef _WIN64
1889 st->print("_");
1890 #endif
1891 }
1892
1893
1894 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1895 #ifndef _WIN64
1896 st->print("@%d", args_size * sizeof(int));
1897 #endif
1898 }
1899
1900 // This method is a copy of JDK's sysGetLastErrorString
1901 // from src/windows/hpi/src/system_md.c
1902
1903 size_t os::lasterror(char* buf, size_t len) {
1904 DWORD errval;
1905
1906 if ((errval = GetLastError()) != 0) {
1907 // DOS error
1908 size_t n = (size_t)FormatMessage(
1909 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1910 NULL,
1911 errval,
1912 0,
1913 buf,
1914 (DWORD)len,
1915 NULL);
1916 if (n > 3) {
1917 // Drop final '.', CR, LF
1918 if (buf[n - 1] == '\n') n--;
1919 if (buf[n - 1] == '\r') n--;
1920 if (buf[n - 1] == '.') n--;
1921 buf[n] = '\0';
1922 }
1923 return n;
1924 }
1925
1926 if (errno != 0) {
1927 // C runtime error that has no corresponding DOS error code
1928 const char* s = os::strerror(errno);
1929 size_t n = strlen(s);
1930 if (n >= len) n = len - 1;
1931 strncpy(buf, s, n);
1932 buf[n] = '\0';
1933 return n;
1934 }
1935
1936 return 0;
1937 }
1938
1939 int os::get_last_error() {
1940 DWORD error = GetLastError();
1941 if (error == 0) {
1942 error = errno;
1943 }
1944 return (int)error;
1945 }
1946
1947 WindowsSemaphore::WindowsSemaphore(uint value) {
1948 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1949
1950 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1951 }
1952
1953 WindowsSemaphore::~WindowsSemaphore() {
1954 ::CloseHandle(_semaphore);
1955 }
1956
1957 void WindowsSemaphore::signal(uint count) {
1958 if (count > 0) {
1959 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1960
1961 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1962 }
1963 }
1964
1965 void WindowsSemaphore::wait() {
1966 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1967 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1968 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1969 }
1970
1971 // sun.misc.Signal
1972 // NOTE that this is a workaround for an apparent kernel bug where if
1973 // a signal handler for SIGBREAK is installed then that signal handler
1974 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1975 // See bug 4416763.
1976 static void (*sigbreakHandler)(int) = NULL;
1977
1978 static void UserHandler(int sig, void *siginfo, void *context) {
1979 os::signal_notify(sig);
1980 // We need to reinstate the signal handler each time...
1981 os::signal(sig, (void*)UserHandler);
1982 }
1983
1984 void* os::user_handler() {
1985 return (void*) UserHandler;
1986 }
1987
1988 void* os::signal(int signal_number, void* handler) {
1989 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1990 void (*oldHandler)(int) = sigbreakHandler;
1991 sigbreakHandler = (void (*)(int)) handler;
1992 return (void*) oldHandler;
1993 } else {
1994 return (void*)::signal(signal_number, (void (*)(int))handler);
1995 }
1996 }
1997
1998 void os::signal_raise(int signal_number) {
1999 raise(signal_number);
2000 }
2001
2002 // The Win32 C runtime library maps all console control events other than ^C
2003 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2004 // logoff, and shutdown events. We therefore install our own console handler
2005 // that raises SIGTERM for the latter cases.
2006 //
2007 static BOOL WINAPI consoleHandler(DWORD event) {
2008 switch (event) {
2009 case CTRL_C_EVENT:
2010 if (is_error_reported()) {
2011 // Ctrl-C is pressed during error reporting, likely because the error
2012 // handler fails to abort. Let VM die immediately.
2013 os::die();
2014 }
2015
2016 os::signal_raise(SIGINT);
2017 return TRUE;
2018 break;
2019 case CTRL_BREAK_EVENT:
2020 if (sigbreakHandler != NULL) {
2021 (*sigbreakHandler)(SIGBREAK);
2022 }
2023 return TRUE;
2024 break;
2025 case CTRL_LOGOFF_EVENT: {
2026 // Don't terminate JVM if it is running in a non-interactive session,
2027 // such as a service process.
2028 USEROBJECTFLAGS flags;
2029 HANDLE handle = GetProcessWindowStation();
2030 if (handle != NULL &&
2031 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2032 sizeof(USEROBJECTFLAGS), NULL)) {
2033 // If it is a non-interactive session, let next handler to deal
2034 // with it.
2035 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2036 return FALSE;
2037 }
2038 }
2039 }
2040 case CTRL_CLOSE_EVENT:
2041 case CTRL_SHUTDOWN_EVENT:
2042 os::signal_raise(SIGTERM);
2043 return TRUE;
2044 break;
2045 default:
2046 break;
2047 }
2048 return FALSE;
2049 }
2050
2051 // The following code is moved from os.cpp for making this
2052 // code platform specific, which it is by its very nature.
2053
2054 // Return maximum OS signal used + 1 for internal use only
2055 // Used as exit signal for signal_thread
2056 int os::sigexitnum_pd() {
2057 return NSIG;
2058 }
2059
2060 // a counter for each possible signal value, including signal_thread exit signal
2061 static volatile jint pending_signals[NSIG+1] = { 0 };
2062 static HANDLE sig_sem = NULL;
2063
2064 void os::signal_init_pd() {
2065 // Initialize signal structures
2066 memset((void*)pending_signals, 0, sizeof(pending_signals));
2067
2068 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2069
2070 // Programs embedding the VM do not want it to attempt to receive
2071 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2072 // shutdown hooks mechanism introduced in 1.3. For example, when
2073 // the VM is run as part of a Windows NT service (i.e., a servlet
2074 // engine in a web server), the correct behavior is for any console
2075 // control handler to return FALSE, not TRUE, because the OS's
2076 // "final" handler for such events allows the process to continue if
2077 // it is a service (while terminating it if it is not a service).
2078 // To make this behavior uniform and the mechanism simpler, we
2079 // completely disable the VM's usage of these console events if -Xrs
2080 // (=ReduceSignalUsage) is specified. This means, for example, that
2081 // the CTRL-BREAK thread dump mechanism is also disabled in this
2082 // case. See bugs 4323062, 4345157, and related bugs.
2083
2084 if (!ReduceSignalUsage) {
2085 // Add a CTRL-C handler
2086 SetConsoleCtrlHandler(consoleHandler, TRUE);
2087 }
2088 }
2089
2090 void os::signal_notify(int signal_number) {
2091 BOOL ret;
2092 if (sig_sem != NULL) {
2093 Atomic::inc(&pending_signals[signal_number]);
2094 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2095 assert(ret != 0, "ReleaseSemaphore() failed");
2096 }
2097 }
2098
2099 static int check_pending_signals(bool wait_for_signal) {
2100 DWORD ret;
2101 while (true) {
2102 for (int i = 0; i < NSIG + 1; i++) {
2103 jint n = pending_signals[i];
2104 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2105 return i;
2106 }
2107 }
2108 if (!wait_for_signal) {
2109 return -1;
2110 }
2111
2112 JavaThread *thread = JavaThread::current();
2113
2114 ThreadBlockInVM tbivm(thread);
2115
2116 bool threadIsSuspended;
2117 do {
2118 thread->set_suspend_equivalent();
2119 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2120 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2121 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2122
2123 // were we externally suspended while we were waiting?
2124 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2125 if (threadIsSuspended) {
2126 // The semaphore has been incremented, but while we were waiting
2127 // another thread suspended us. We don't want to continue running
2128 // while suspended because that would surprise the thread that
2129 // suspended us.
2130 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2131 assert(ret != 0, "ReleaseSemaphore() failed");
2132
2133 thread->java_suspend_self();
2134 }
2135 } while (threadIsSuspended);
2136 }
2137 }
2138
2139 int os::signal_lookup() {
2140 return check_pending_signals(false);
2141 }
2142
2143 int os::signal_wait() {
2144 return check_pending_signals(true);
2145 }
2146
2147 // Implicit OS exception handling
2148
2149 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2150 address handler) {
2151 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2152 // Save pc in thread
2153 #ifdef _M_IA64
2154 // Do not blow up if no thread info available.
2155 if (thread) {
2156 // Saving PRECISE pc (with slot information) in thread.
2157 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2158 // Convert precise PC into "Unix" format
2159 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2160 thread->set_saved_exception_pc((address)precise_pc);
2161 }
2162 // Set pc to handler
2163 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2164 // Clear out psr.ri (= Restart Instruction) in order to continue
2165 // at the beginning of the target bundle.
2166 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2167 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2168 #else
2169 #ifdef _M_AMD64
2170 // Do not blow up if no thread info available.
2171 if (thread) {
2172 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2173 }
2174 // Set pc to handler
2175 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2176 #else
2177 // Do not blow up if no thread info available.
2178 if (thread) {
2179 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2180 }
2181 // Set pc to handler
2182 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2183 #endif
2184 #endif
2185
2186 // Continue the execution
2187 return EXCEPTION_CONTINUE_EXECUTION;
2188 }
2189
2190
2191 // Used for PostMortemDump
2192 extern "C" void safepoints();
2193 extern "C" void find(int x);
2194 extern "C" void events();
2195
2196 // According to Windows API documentation, an illegal instruction sequence should generate
2197 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2198 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2199 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2200
2201 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2202
2203 // From "Execution Protection in the Windows Operating System" draft 0.35
2204 // Once a system header becomes available, the "real" define should be
2205 // included or copied here.
2206 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2207
2208 // Handle NAT Bit consumption on IA64.
2209 #ifdef _M_IA64
2210 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2211 #endif
2212
2213 // Windows Vista/2008 heap corruption check
2214 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2215
2216 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2217 // C++ compiler contain this error code. Because this is a compiler-generated
2218 // error, the code is not listed in the Win32 API header files.
2219 // The code is actually a cryptic mnemonic device, with the initial "E"
2220 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2221 // ASCII values of "msc".
2222
2223 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2224
2225 #define def_excpt(val) { #val, (val) }
2226
2227 static const struct { char* name; uint number; } exceptlabels[] = {
2228 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2229 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2230 def_excpt(EXCEPTION_BREAKPOINT),
2231 def_excpt(EXCEPTION_SINGLE_STEP),
2232 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2233 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2234 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2235 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2236 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2237 def_excpt(EXCEPTION_FLT_OVERFLOW),
2238 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2239 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2240 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2241 def_excpt(EXCEPTION_INT_OVERFLOW),
2242 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2243 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2244 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2245 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2246 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2247 def_excpt(EXCEPTION_STACK_OVERFLOW),
2248 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2249 def_excpt(EXCEPTION_GUARD_PAGE),
2250 def_excpt(EXCEPTION_INVALID_HANDLE),
2251 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2252 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2253 #ifdef _M_IA64
2254 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2255 #endif
2256 };
2257
2258 #undef def_excpt
2259
2260 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2261 uint code = static_cast<uint>(exception_code);
2262 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2263 if (exceptlabels[i].number == code) {
2264 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2265 return buf;
2266 }
2267 }
2268
2269 return NULL;
2270 }
2271
2272 //-----------------------------------------------------------------------------
2273 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2274 // handle exception caused by idiv; should only happen for -MinInt/-1
2275 // (division by zero is handled explicitly)
2276 #ifdef _M_IA64
2277 assert(0, "Fix Handle_IDiv_Exception");
2278 #else
2279 #ifdef _M_AMD64
2280 PCONTEXT ctx = exceptionInfo->ContextRecord;
2281 address pc = (address)ctx->Rip;
2282 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2283 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2284 if (pc[0] == 0xF7) {
2285 // set correct result values and continue after idiv instruction
2286 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2287 } else {
2288 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2289 }
2290 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2291 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2292 // idiv opcode (0xF7).
2293 ctx->Rdx = (DWORD)0; // remainder
2294 // Continue the execution
2295 #else
2296 PCONTEXT ctx = exceptionInfo->ContextRecord;
2297 address pc = (address)ctx->Eip;
2298 assert(pc[0] == 0xF7, "not an idiv opcode");
2299 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2300 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2301 // set correct result values and continue after idiv instruction
2302 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2303 ctx->Eax = (DWORD)min_jint; // result
2304 ctx->Edx = (DWORD)0; // remainder
2305 // Continue the execution
2306 #endif
2307 #endif
2308 return EXCEPTION_CONTINUE_EXECUTION;
2309 }
2310
2311 //-----------------------------------------------------------------------------
2312 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2313 PCONTEXT ctx = exceptionInfo->ContextRecord;
2314 #ifndef _WIN64
2315 // handle exception caused by native method modifying control word
2316 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2317
2318 switch (exception_code) {
2319 case EXCEPTION_FLT_DENORMAL_OPERAND:
2320 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2321 case EXCEPTION_FLT_INEXACT_RESULT:
2322 case EXCEPTION_FLT_INVALID_OPERATION:
2323 case EXCEPTION_FLT_OVERFLOW:
2324 case EXCEPTION_FLT_STACK_CHECK:
2325 case EXCEPTION_FLT_UNDERFLOW:
2326 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2327 if (fp_control_word != ctx->FloatSave.ControlWord) {
2328 // Restore FPCW and mask out FLT exceptions
2329 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2330 // Mask out pending FLT exceptions
2331 ctx->FloatSave.StatusWord &= 0xffffff00;
2332 return EXCEPTION_CONTINUE_EXECUTION;
2333 }
2334 }
2335
2336 if (prev_uef_handler != NULL) {
2337 // We didn't handle this exception so pass it to the previous
2338 // UnhandledExceptionFilter.
2339 return (prev_uef_handler)(exceptionInfo);
2340 }
2341 #else // !_WIN64
2342 // On Windows, the mxcsr control bits are non-volatile across calls
2343 // See also CR 6192333
2344 //
2345 jint MxCsr = INITIAL_MXCSR;
2346 // we can't use StubRoutines::addr_mxcsr_std()
2347 // because in Win64 mxcsr is not saved there
2348 if (MxCsr != ctx->MxCsr) {
2349 ctx->MxCsr = MxCsr;
2350 return EXCEPTION_CONTINUE_EXECUTION;
2351 }
2352 #endif // !_WIN64
2353
2354 return EXCEPTION_CONTINUE_SEARCH;
2355 }
2356
2357 static inline void report_error(Thread* t, DWORD exception_code,
2358 address addr, void* siginfo, void* context) {
2359 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2360
2361 // If UseOsErrorReporting, this will return here and save the error file
2362 // somewhere where we can find it in the minidump.
2363 }
2364
2365 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2366 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2367 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2368 address addr = (address) exceptionRecord->ExceptionInformation[1];
2369 if (Interpreter::contains(pc)) {
2370 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2371 if (!fr->is_first_java_frame()) {
2372 assert(fr->safe_for_sender(thread), "Safety check");
2373 *fr = fr->java_sender();
2374 }
2375 } else {
2376 // more complex code with compiled code
2377 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2378 CodeBlob* cb = CodeCache::find_blob(pc);
2379 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2380 // Not sure where the pc points to, fallback to default
2381 // stack overflow handling
2382 return false;
2383 } else {
2384 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2385 // in compiled code, the stack banging is performed just after the return pc
2386 // has been pushed on the stack
2387 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2388 if (!fr->is_java_frame()) {
2389 assert(fr->safe_for_sender(thread), "Safety check");
2390 *fr = fr->java_sender();
2391 }
2392 }
2393 }
2394 assert(fr->is_java_frame(), "Safety check");
2395 return true;
2396 }
2397
2398 //-----------------------------------------------------------------------------
2399 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2400 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2401 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2402 #ifdef _M_IA64
2403 // On Itanium, we need the "precise pc", which has the slot number coded
2404 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2405 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2406 // Convert the pc to "Unix format", which has the slot number coded
2407 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2408 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2409 // information is saved in the Unix format.
2410 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2411 #else
2412 #ifdef _M_AMD64
2413 address pc = (address) exceptionInfo->ContextRecord->Rip;
2414 #else
2415 address pc = (address) exceptionInfo->ContextRecord->Eip;
2416 #endif
2417 #endif
2418 Thread* t = Thread::current_or_null_safe();
2419
2420 // Handle SafeFetch32 and SafeFetchN exceptions.
2421 if (StubRoutines::is_safefetch_fault(pc)) {
2422 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2423 }
2424
2425 #ifndef _WIN64
2426 // Execution protection violation - win32 running on AMD64 only
2427 // Handled first to avoid misdiagnosis as a "normal" access violation;
2428 // This is safe to do because we have a new/unique ExceptionInformation
2429 // code for this condition.
2430 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2431 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2432 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2433 address addr = (address) exceptionRecord->ExceptionInformation[1];
2434
2435 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2436 int page_size = os::vm_page_size();
2437
2438 // Make sure the pc and the faulting address are sane.
2439 //
2440 // If an instruction spans a page boundary, and the page containing
2441 // the beginning of the instruction is executable but the following
2442 // page is not, the pc and the faulting address might be slightly
2443 // different - we still want to unguard the 2nd page in this case.
2444 //
2445 // 15 bytes seems to be a (very) safe value for max instruction size.
2446 bool pc_is_near_addr =
2447 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2448 bool instr_spans_page_boundary =
2449 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2450 (intptr_t) page_size) > 0);
2451
2452 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2453 static volatile address last_addr =
2454 (address) os::non_memory_address_word();
2455
2456 // In conservative mode, don't unguard unless the address is in the VM
2457 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2458 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2459
2460 // Set memory to RWX and retry
2461 address page_start =
2462 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2463 bool res = os::protect_memory((char*) page_start, page_size,
2464 os::MEM_PROT_RWX);
2465
2466 log_debug(os)("Execution protection violation "
2467 "at " INTPTR_FORMAT
2468 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2469 p2i(page_start), (res ? "success" : os::strerror(errno)));
2470
2471 // Set last_addr so if we fault again at the same address, we don't
2472 // end up in an endless loop.
2473 //
2474 // There are two potential complications here. Two threads trapping
2475 // at the same address at the same time could cause one of the
2476 // threads to think it already unguarded, and abort the VM. Likely
2477 // very rare.
2478 //
2479 // The other race involves two threads alternately trapping at
2480 // different addresses and failing to unguard the page, resulting in
2481 // an endless loop. This condition is probably even more unlikely
2482 // than the first.
2483 //
2484 // Although both cases could be avoided by using locks or thread
2485 // local last_addr, these solutions are unnecessary complication:
2486 // this handler is a best-effort safety net, not a complete solution.
2487 // It is disabled by default and should only be used as a workaround
2488 // in case we missed any no-execute-unsafe VM code.
2489
2490 last_addr = addr;
2491
2492 return EXCEPTION_CONTINUE_EXECUTION;
2493 }
2494 }
2495
2496 // Last unguard failed or not unguarding
2497 tty->print_raw_cr("Execution protection violation");
2498 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2499 exceptionInfo->ContextRecord);
2500 return EXCEPTION_CONTINUE_SEARCH;
2501 }
2502 }
2503 #endif // _WIN64
2504
2505 // Check to see if we caught the safepoint code in the
2506 // process of write protecting the memory serialization page.
2507 // It write enables the page immediately after protecting it
2508 // so just return.
2509 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2510 JavaThread* thread = (JavaThread*) t;
2511 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2512 address addr = (address) exceptionRecord->ExceptionInformation[1];
2513 if (os::is_memory_serialize_page(thread, addr)) {
2514 // Block current thread until the memory serialize page permission restored.
2515 os::block_on_serialize_page_trap();
2516 return EXCEPTION_CONTINUE_EXECUTION;
2517 }
2518 }
2519
2520 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2521 VM_Version::is_cpuinfo_segv_addr(pc)) {
2522 // Verify that OS save/restore AVX registers.
2523 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2524 }
2525
2526 if (t != NULL && t->is_Java_thread()) {
2527 JavaThread* thread = (JavaThread*) t;
2528 bool in_java = thread->thread_state() == _thread_in_Java;
2529
2530 // Handle potential stack overflows up front.
2531 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2532 #ifdef _M_IA64
2533 // Use guard page for register stack.
2534 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2535 address addr = (address) exceptionRecord->ExceptionInformation[1];
2536 // Check for a register stack overflow on Itanium
2537 if (thread->addr_inside_register_stack_red_zone(addr)) {
2538 // Fatal red zone violation happens if the Java program
2539 // catches a StackOverflow error and does so much processing
2540 // that it runs beyond the unprotected yellow guard zone. As
2541 // a result, we are out of here.
2542 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2543 } else if(thread->addr_inside_register_stack(addr)) {
2544 // Disable the yellow zone which sets the state that
2545 // we've got a stack overflow problem.
2546 if (thread->stack_yellow_reserved_zone_enabled()) {
2547 thread->disable_stack_yellow_reserved_zone();
2548 }
2549 // Give us some room to process the exception.
2550 thread->disable_register_stack_guard();
2551 // Tracing with +Verbose.
2552 if (Verbose) {
2553 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2554 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2555 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2556 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2557 thread->register_stack_base(),
2558 thread->register_stack_base() + thread->stack_size());
2559 }
2560
2561 // Reguard the permanent register stack red zone just to be sure.
2562 // We saw Windows silently disabling this without telling us.
2563 thread->enable_register_stack_red_zone();
2564
2565 return Handle_Exception(exceptionInfo,
2566 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2567 }
2568 #endif
2569 if (thread->stack_guards_enabled()) {
2570 if (_thread_in_Java) {
2571 frame fr;
2572 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2573 address addr = (address) exceptionRecord->ExceptionInformation[1];
2574 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2575 assert(fr.is_java_frame(), "Must be a Java frame");
2576 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2577 }
2578 }
2579 // Yellow zone violation. The o/s has unprotected the first yellow
2580 // zone page for us. Note: must call disable_stack_yellow_zone to
2581 // update the enabled status, even if the zone contains only one page.
2582 thread->disable_stack_yellow_reserved_zone();
2583 // If not in java code, return and hope for the best.
2584 return in_java
2585 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2586 : EXCEPTION_CONTINUE_EXECUTION;
2587 } else {
2588 // Fatal red zone violation.
2589 thread->disable_stack_red_zone();
2590 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2591 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2592 exceptionInfo->ContextRecord);
2593 return EXCEPTION_CONTINUE_SEARCH;
2594 }
2595 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2596 // Either stack overflow or null pointer exception.
2597 if (in_java) {
2598 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2599 address addr = (address) exceptionRecord->ExceptionInformation[1];
2600 address stack_end = thread->stack_end();
2601 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2602 // Stack overflow.
2603 assert(!os::uses_stack_guard_pages(),
2604 "should be caught by red zone code above.");
2605 return Handle_Exception(exceptionInfo,
2606 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2607 }
2608 // Check for safepoint polling and implicit null
2609 // We only expect null pointers in the stubs (vtable)
2610 // the rest are checked explicitly now.
2611 CodeBlob* cb = CodeCache::find_blob(pc);
2612 if (cb != NULL) {
2613 if (os::is_poll_address(addr)) {
2614 address stub = SharedRuntime::get_poll_stub(pc);
2615 return Handle_Exception(exceptionInfo, stub);
2616 }
2617 }
2618 {
2619 #ifdef _WIN64
2620 // If it's a legal stack address map the entire region in
2621 //
2622 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2623 address addr = (address) exceptionRecord->ExceptionInformation[1];
2624 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2625 addr = (address)((uintptr_t)addr &
2626 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2627 os::commit_memory((char *)addr, thread->stack_base() - addr,
2628 !ExecMem);
2629 return EXCEPTION_CONTINUE_EXECUTION;
2630 } else
2631 #endif
2632 {
2633 // Null pointer exception.
2634 #ifdef _M_IA64
2635 // Process implicit null checks in compiled code. Note: Implicit null checks
2636 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2637 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2638 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2639 // Handle implicit null check in UEP method entry
2640 if (cb && (cb->is_frame_complete_at(pc) ||
2641 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2642 if (Verbose) {
2643 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2644 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2645 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2646 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2647 *(bundle_start + 1), *bundle_start);
2648 }
2649 return Handle_Exception(exceptionInfo,
2650 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2651 }
2652 }
2653
2654 // Implicit null checks were processed above. Hence, we should not reach
2655 // here in the usual case => die!
2656 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2657 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2658 exceptionInfo->ContextRecord);
2659 return EXCEPTION_CONTINUE_SEARCH;
2660
2661 #else // !IA64
2662
2663 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2664 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2665 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2666 }
2667 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2668 exceptionInfo->ContextRecord);
2669 return EXCEPTION_CONTINUE_SEARCH;
2670 #endif
2671 }
2672 }
2673 }
2674
2675 #ifdef _WIN64
2676 // Special care for fast JNI field accessors.
2677 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2678 // in and the heap gets shrunk before the field access.
2679 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2680 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2681 if (addr != (address)-1) {
2682 return Handle_Exception(exceptionInfo, addr);
2683 }
2684 }
2685 #endif
2686
2687 // Stack overflow or null pointer exception in native code.
2688 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2689 exceptionInfo->ContextRecord);
2690 return EXCEPTION_CONTINUE_SEARCH;
2691 } // /EXCEPTION_ACCESS_VIOLATION
2692 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2693 #if defined _M_IA64
2694 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2695 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2696 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2697
2698 // Compiled method patched to be non entrant? Following conditions must apply:
2699 // 1. must be first instruction in bundle
2700 // 2. must be a break instruction with appropriate code
2701 if ((((uint64_t) pc & 0x0F) == 0) &&
2702 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2703 return Handle_Exception(exceptionInfo,
2704 (address)SharedRuntime::get_handle_wrong_method_stub());
2705 }
2706 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2707 #endif
2708
2709
2710 if (in_java) {
2711 switch (exception_code) {
2712 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2713 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2714
2715 case EXCEPTION_INT_OVERFLOW:
2716 return Handle_IDiv_Exception(exceptionInfo);
2717
2718 } // switch
2719 }
2720 if (((thread->thread_state() == _thread_in_Java) ||
2721 (thread->thread_state() == _thread_in_native)) &&
2722 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2723 LONG result=Handle_FLT_Exception(exceptionInfo);
2724 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2725 }
2726 }
2727
2728 if (exception_code != EXCEPTION_BREAKPOINT) {
2729 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2730 exceptionInfo->ContextRecord);
2731 }
2732 return EXCEPTION_CONTINUE_SEARCH;
2733 }
2734
2735 #ifndef _WIN64
2736 // Special care for fast JNI accessors.
2737 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2738 // the heap gets shrunk before the field access.
2739 // Need to install our own structured exception handler since native code may
2740 // install its own.
2741 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2742 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2743 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2744 address pc = (address) exceptionInfo->ContextRecord->Eip;
2745 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2746 if (addr != (address)-1) {
2747 return Handle_Exception(exceptionInfo, addr);
2748 }
2749 }
2750 return EXCEPTION_CONTINUE_SEARCH;
2751 }
2752
2753 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2754 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2755 jobject obj, \
2756 jfieldID fieldID) { \
2757 __try { \
2758 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2759 obj, \
2760 fieldID); \
2761 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2762 _exception_info())) { \
2763 } \
2764 return 0; \
2765 }
2766
2767 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2768 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2769 DEFINE_FAST_GETFIELD(jchar, char, Char)
2770 DEFINE_FAST_GETFIELD(jshort, short, Short)
2771 DEFINE_FAST_GETFIELD(jint, int, Int)
2772 DEFINE_FAST_GETFIELD(jlong, long, Long)
2773 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2774 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2775
2776 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2777 switch (type) {
2778 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2779 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2780 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2781 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2782 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2783 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2784 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2785 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2786 default: ShouldNotReachHere();
2787 }
2788 return (address)-1;
2789 }
2790 #endif
2791
2792 // Virtual Memory
2793
2794 int os::vm_page_size() { return os::win32::vm_page_size(); }
2795 int os::vm_allocation_granularity() {
2796 return os::win32::vm_allocation_granularity();
2797 }
2798
2799 // Windows large page support is available on Windows 2003. In order to use
2800 // large page memory, the administrator must first assign additional privilege
2801 // to the user:
2802 // + select Control Panel -> Administrative Tools -> Local Security Policy
2803 // + select Local Policies -> User Rights Assignment
2804 // + double click "Lock pages in memory", add users and/or groups
2805 // + reboot
2806 // Note the above steps are needed for administrator as well, as administrators
2807 // by default do not have the privilege to lock pages in memory.
2808 //
2809 // Note about Windows 2003: although the API supports committing large page
2810 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2811 // scenario, I found through experiment it only uses large page if the entire
2812 // memory region is reserved and committed in a single VirtualAlloc() call.
2813 // This makes Windows large page support more or less like Solaris ISM, in
2814 // that the entire heap must be committed upfront. This probably will change
2815 // in the future, if so the code below needs to be revisited.
2816
2817 #ifndef MEM_LARGE_PAGES
2818 #define MEM_LARGE_PAGES 0x20000000
2819 #endif
2820
2821 static HANDLE _hProcess;
2822 static HANDLE _hToken;
2823
2824 // Container for NUMA node list info
2825 class NUMANodeListHolder {
2826 private:
2827 int *_numa_used_node_list; // allocated below
2828 int _numa_used_node_count;
2829
2830 void free_node_list() {
2831 if (_numa_used_node_list != NULL) {
2832 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2833 }
2834 }
2835
2836 public:
2837 NUMANodeListHolder() {
2838 _numa_used_node_count = 0;
2839 _numa_used_node_list = NULL;
2840 // do rest of initialization in build routine (after function pointers are set up)
2841 }
2842
2843 ~NUMANodeListHolder() {
2844 free_node_list();
2845 }
2846
2847 bool build() {
2848 DWORD_PTR proc_aff_mask;
2849 DWORD_PTR sys_aff_mask;
2850 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2851 ULONG highest_node_number;
2852 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2853 free_node_list();
2854 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2855 for (unsigned int i = 0; i <= highest_node_number; i++) {
2856 ULONGLONG proc_mask_numa_node;
2857 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2858 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2859 _numa_used_node_list[_numa_used_node_count++] = i;
2860 }
2861 }
2862 return (_numa_used_node_count > 1);
2863 }
2864
2865 int get_count() { return _numa_used_node_count; }
2866 int get_node_list_entry(int n) {
2867 // for indexes out of range, returns -1
2868 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2869 }
2870
2871 } numa_node_list_holder;
2872
2873
2874
2875 static size_t _large_page_size = 0;
2876
2877 static bool request_lock_memory_privilege() {
2878 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2879 os::current_process_id());
2880
2881 LUID luid;
2882 if (_hProcess != NULL &&
2883 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2884 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2885
2886 TOKEN_PRIVILEGES tp;
2887 tp.PrivilegeCount = 1;
2888 tp.Privileges[0].Luid = luid;
2889 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2890
2891 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2892 // privilege. Check GetLastError() too. See MSDN document.
2893 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2894 (GetLastError() == ERROR_SUCCESS)) {
2895 return true;
2896 }
2897 }
2898
2899 return false;
2900 }
2901
2902 static void cleanup_after_large_page_init() {
2903 if (_hProcess) CloseHandle(_hProcess);
2904 _hProcess = NULL;
2905 if (_hToken) CloseHandle(_hToken);
2906 _hToken = NULL;
2907 }
2908
2909 static bool numa_interleaving_init() {
2910 bool success = false;
2911 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2912
2913 // print a warning if UseNUMAInterleaving flag is specified on command line
2914 bool warn_on_failure = use_numa_interleaving_specified;
2915 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2916
2917 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2918 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2919 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2920
2921 if (numa_node_list_holder.build()) {
2922 if (log_is_enabled(Debug, os, cpu)) {
2923 Log(os, cpu) log;
2924 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2925 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2926 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2927 }
2928 }
2929 success = true;
2930 } else {
2931 WARN("Process does not cover multiple NUMA nodes.");
2932 }
2933 if (!success) {
2934 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2935 }
2936 return success;
2937 #undef WARN
2938 }
2939
2940 // this routine is used whenever we need to reserve a contiguous VA range
2941 // but we need to make separate VirtualAlloc calls for each piece of the range
2942 // Reasons for doing this:
2943 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2944 // * UseNUMAInterleaving requires a separate node for each piece
2945 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2946 DWORD prot,
2947 bool should_inject_error = false) {
2948 char * p_buf;
2949 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2950 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2951 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2952
2953 // first reserve enough address space in advance since we want to be
2954 // able to break a single contiguous virtual address range into multiple
2955 // large page commits but WS2003 does not allow reserving large page space
2956 // so we just use 4K pages for reserve, this gives us a legal contiguous
2957 // address space. then we will deallocate that reservation, and re alloc
2958 // using large pages
2959 const size_t size_of_reserve = bytes + chunk_size;
2960 if (bytes > size_of_reserve) {
2961 // Overflowed.
2962 return NULL;
2963 }
2964 p_buf = (char *) VirtualAlloc(addr,
2965 size_of_reserve, // size of Reserve
2966 MEM_RESERVE,
2967 PAGE_READWRITE);
2968 // If reservation failed, return NULL
2969 if (p_buf == NULL) return NULL;
2970 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2971 os::release_memory(p_buf, bytes + chunk_size);
2972
2973 // we still need to round up to a page boundary (in case we are using large pages)
2974 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2975 // instead we handle this in the bytes_to_rq computation below
2976 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2977
2978 // now go through and allocate one chunk at a time until all bytes are
2979 // allocated
2980 size_t bytes_remaining = bytes;
2981 // An overflow of align_size_up() would have been caught above
2982 // in the calculation of size_of_reserve.
2983 char * next_alloc_addr = p_buf;
2984 HANDLE hProc = GetCurrentProcess();
2985
2986 #ifdef ASSERT
2987 // Variable for the failure injection
2988 long ran_num = os::random();
2989 size_t fail_after = ran_num % bytes;
2990 #endif
2991
2992 int count=0;
2993 while (bytes_remaining) {
2994 // select bytes_to_rq to get to the next chunk_size boundary
2995
2996 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2997 // Note allocate and commit
2998 char * p_new;
2999
3000 #ifdef ASSERT
3001 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3002 #else
3003 const bool inject_error_now = false;
3004 #endif
3005
3006 if (inject_error_now) {
3007 p_new = NULL;
3008 } else {
3009 if (!UseNUMAInterleaving) {
3010 p_new = (char *) VirtualAlloc(next_alloc_addr,
3011 bytes_to_rq,
3012 flags,
3013 prot);
3014 } else {
3015 // get the next node to use from the used_node_list
3016 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3017 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3018 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3019 }
3020 }
3021
3022 if (p_new == NULL) {
3023 // Free any allocated pages
3024 if (next_alloc_addr > p_buf) {
3025 // Some memory was committed so release it.
3026 size_t bytes_to_release = bytes - bytes_remaining;
3027 // NMT has yet to record any individual blocks, so it
3028 // need to create a dummy 'reserve' record to match
3029 // the release.
3030 MemTracker::record_virtual_memory_reserve((address)p_buf,
3031 bytes_to_release, CALLER_PC);
3032 os::release_memory(p_buf, bytes_to_release);
3033 }
3034 #ifdef ASSERT
3035 if (should_inject_error) {
3036 log_develop_debug(pagesize)("Reserving pages individually failed.");
3037 }
3038 #endif
3039 return NULL;
3040 }
3041
3042 bytes_remaining -= bytes_to_rq;
3043 next_alloc_addr += bytes_to_rq;
3044 count++;
3045 }
3046 // Although the memory is allocated individually, it is returned as one.
3047 // NMT records it as one block.
3048 if ((flags & MEM_COMMIT) != 0) {
3049 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3050 } else {
3051 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3052 }
3053
3054 // made it this far, success
3055 return p_buf;
3056 }
3057
3058
3059
3060 void os::large_page_init() {
3061 if (!UseLargePages) return;
3062
3063 // print a warning if any large page related flag is specified on command line
3064 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3065 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3066 bool success = false;
3067
3068 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3069 if (request_lock_memory_privilege()) {
3070 size_t s = GetLargePageMinimum();
3071 if (s) {
3072 #if defined(IA32) || defined(AMD64)
3073 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3074 WARN("JVM cannot use large pages bigger than 4mb.");
3075 } else {
3076 #endif
3077 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3078 _large_page_size = LargePageSizeInBytes;
3079 } else {
3080 _large_page_size = s;
3081 }
3082 success = true;
3083 #if defined(IA32) || defined(AMD64)
3084 }
3085 #endif
3086 } else {
3087 WARN("Large page is not supported by the processor.");
3088 }
3089 } else {
3090 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3091 }
3092 #undef WARN
3093
3094 const size_t default_page_size = (size_t) vm_page_size();
3095 if (success && _large_page_size > default_page_size) {
3096 _page_sizes[0] = _large_page_size;
3097 _page_sizes[1] = default_page_size;
3098 _page_sizes[2] = 0;
3099 }
3100
3101 cleanup_after_large_page_init();
3102 UseLargePages = success;
3103 }
3104
3105 // On win32, one cannot release just a part of reserved memory, it's an
3106 // all or nothing deal. When we split a reservation, we must break the
3107 // reservation into two reservations.
3108 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3109 bool realloc) {
3110 if (size > 0) {
3111 release_memory(base, size);
3112 if (realloc) {
3113 reserve_memory(split, base);
3114 }
3115 if (size != split) {
3116 reserve_memory(size - split, base + split);
3117 }
3118 }
3119 }
3120
3121 // Multiple threads can race in this code but it's not possible to unmap small sections of
3122 // virtual space to get requested alignment, like posix-like os's.
3123 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3124 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3125 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3126 "Alignment must be a multiple of allocation granularity (page size)");
3127 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3128
3129 size_t extra_size = size + alignment;
3130 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3131
3132 char* aligned_base = NULL;
3133
3134 do {
3135 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3136 if (extra_base == NULL) {
3137 return NULL;
3138 }
3139 // Do manual alignment
3140 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3141
3142 os::release_memory(extra_base, extra_size);
3143
3144 aligned_base = os::reserve_memory(size, aligned_base);
3145
3146 } while (aligned_base == NULL);
3147
3148 return aligned_base;
3149 }
3150
3151 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3152 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3153 "reserve alignment");
3154 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3155 char* res;
3156 // note that if UseLargePages is on, all the areas that require interleaving
3157 // will go thru reserve_memory_special rather than thru here.
3158 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3159 if (!use_individual) {
3160 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3161 } else {
3162 elapsedTimer reserveTimer;
3163 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3164 // in numa interleaving, we have to allocate pages individually
3165 // (well really chunks of NUMAInterleaveGranularity size)
3166 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3167 if (res == NULL) {
3168 warning("NUMA page allocation failed");
3169 }
3170 if (Verbose && PrintMiscellaneous) {
3171 reserveTimer.stop();
3172 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3173 reserveTimer.milliseconds(), reserveTimer.ticks());
3174 }
3175 }
3176 assert(res == NULL || addr == NULL || addr == res,
3177 "Unexpected address from reserve.");
3178
3179 return res;
3180 }
3181
3182 // Reserve memory at an arbitrary address, only if that area is
3183 // available (and not reserved for something else).
3184 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3185 // Windows os::reserve_memory() fails of the requested address range is
3186 // not avilable.
3187 return reserve_memory(bytes, requested_addr);
3188 }
3189
3190 size_t os::large_page_size() {
3191 return _large_page_size;
3192 }
3193
3194 bool os::can_commit_large_page_memory() {
3195 // Windows only uses large page memory when the entire region is reserved
3196 // and committed in a single VirtualAlloc() call. This may change in the
3197 // future, but with Windows 2003 it's not possible to commit on demand.
3198 return false;
3199 }
3200
3201 bool os::can_execute_large_page_memory() {
3202 return true;
3203 }
3204
3205 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3206 bool exec) {
3207 assert(UseLargePages, "only for large pages");
3208
3209 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3210 return NULL; // Fallback to small pages.
3211 }
3212
3213 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3214 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3215
3216 // with large pages, there are two cases where we need to use Individual Allocation
3217 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3218 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3219 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3220 log_debug(pagesize)("Reserving large pages individually.");
3221
3222 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3223 if (p_buf == NULL) {
3224 // give an appropriate warning message
3225 if (UseNUMAInterleaving) {
3226 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3227 }
3228 if (UseLargePagesIndividualAllocation) {
3229 warning("Individually allocated large pages failed, "
3230 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3231 }
3232 return NULL;
3233 }
3234
3235 return p_buf;
3236
3237 } else {
3238 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3239
3240 // normal policy just allocate it all at once
3241 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3242 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3243 if (res != NULL) {
3244 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3245 }
3246
3247 return res;
3248 }
3249 }
3250
3251 bool os::release_memory_special(char* base, size_t bytes) {
3252 assert(base != NULL, "Sanity check");
3253 return release_memory(base, bytes);
3254 }
3255
3256 void os::print_statistics() {
3257 }
3258
3259 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3260 int err = os::get_last_error();
3261 char buf[256];
3262 size_t buf_len = os::lasterror(buf, sizeof(buf));
3263 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3264 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3265 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3266 }
3267
3268 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3269 if (bytes == 0) {
3270 // Don't bother the OS with noops.
3271 return true;
3272 }
3273 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3274 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3275 // Don't attempt to print anything if the OS call fails. We're
3276 // probably low on resources, so the print itself may cause crashes.
3277
3278 // unless we have NUMAInterleaving enabled, the range of a commit
3279 // is always within a reserve covered by a single VirtualAlloc
3280 // in that case we can just do a single commit for the requested size
3281 if (!UseNUMAInterleaving) {
3282 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3283 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3284 return false;
3285 }
3286 if (exec) {
3287 DWORD oldprot;
3288 // Windows doc says to use VirtualProtect to get execute permissions
3289 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3290 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3291 return false;
3292 }
3293 }
3294 return true;
3295 } else {
3296
3297 // when NUMAInterleaving is enabled, the commit might cover a range that
3298 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3299 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3300 // returns represents the number of bytes that can be committed in one step.
3301 size_t bytes_remaining = bytes;
3302 char * next_alloc_addr = addr;
3303 while (bytes_remaining > 0) {
3304 MEMORY_BASIC_INFORMATION alloc_info;
3305 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3306 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3307 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3308 PAGE_READWRITE) == NULL) {
3309 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3310 exec);)
3311 return false;
3312 }
3313 if (exec) {
3314 DWORD oldprot;
3315 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3316 PAGE_EXECUTE_READWRITE, &oldprot)) {
3317 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3318 exec);)
3319 return false;
3320 }
3321 }
3322 bytes_remaining -= bytes_to_rq;
3323 next_alloc_addr += bytes_to_rq;
3324 }
3325 }
3326 // if we made it this far, return true
3327 return true;
3328 }
3329
3330 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3331 bool exec) {
3332 // alignment_hint is ignored on this OS
3333 return pd_commit_memory(addr, size, exec);
3334 }
3335
3336 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3337 const char* mesg) {
3338 assert(mesg != NULL, "mesg must be specified");
3339 if (!pd_commit_memory(addr, size, exec)) {
3340 warn_fail_commit_memory(addr, size, exec);
3341 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3342 }
3343 }
3344
3345 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3346 size_t alignment_hint, bool exec,
3347 const char* mesg) {
3348 // alignment_hint is ignored on this OS
3349 pd_commit_memory_or_exit(addr, size, exec, mesg);
3350 }
3351
3352 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3353 if (bytes == 0) {
3354 // Don't bother the OS with noops.
3355 return true;
3356 }
3357 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3358 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3359 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3360 }
3361
3362 bool os::pd_release_memory(char* addr, size_t bytes) {
3363 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3364 }
3365
3366 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3367 return os::commit_memory(addr, size, !ExecMem);
3368 }
3369
3370 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3371 return os::uncommit_memory(addr, size);
3372 }
3373
3374 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3375 uint count = 0;
3376 bool ret = false;
3377 size_t bytes_remaining = bytes;
3378 char * next_protect_addr = addr;
3379
3380 // Use VirtualQuery() to get the chunk size.
3381 while (bytes_remaining) {
3382 MEMORY_BASIC_INFORMATION alloc_info;
3383 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3384 return false;
3385 }
3386
3387 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3388 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3389 // but we don't distinguish here as both cases are protected by same API.
3390 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3391 warning("Failed protecting pages individually for chunk #%u", count);
3392 if (!ret) {
3393 return false;
3394 }
3395
3396 bytes_remaining -= bytes_to_protect;
3397 next_protect_addr += bytes_to_protect;
3398 count++;
3399 }
3400 return ret;
3401 }
3402
3403 // Set protections specified
3404 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3405 bool is_committed) {
3406 unsigned int p = 0;
3407 switch (prot) {
3408 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3409 case MEM_PROT_READ: p = PAGE_READONLY; break;
3410 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3411 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3412 default:
3413 ShouldNotReachHere();
3414 }
3415
3416 DWORD old_status;
3417
3418 // Strange enough, but on Win32 one can change protection only for committed
3419 // memory, not a big deal anyway, as bytes less or equal than 64K
3420 if (!is_committed) {
3421 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3422 "cannot commit protection page");
3423 }
3424 // One cannot use os::guard_memory() here, as on Win32 guard page
3425 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3426 //
3427 // Pages in the region become guard pages. Any attempt to access a guard page
3428 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3429 // the guard page status. Guard pages thus act as a one-time access alarm.
3430 bool ret;
3431 if (UseNUMAInterleaving) {
3432 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3433 // so we must protect the chunks individually.
3434 ret = protect_pages_individually(addr, bytes, p, &old_status);
3435 } else {
3436 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3437 }
3438 #ifdef ASSERT
3439 if (!ret) {
3440 int err = os::get_last_error();
3441 char buf[256];
3442 size_t buf_len = os::lasterror(buf, sizeof(buf));
3443 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3444 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3445 buf_len != 0 ? buf : "<no_error_string>", err);
3446 }
3447 #endif
3448 return ret;
3449 }
3450
3451 bool os::guard_memory(char* addr, size_t bytes) {
3452 DWORD old_status;
3453 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3454 }
3455
3456 bool os::unguard_memory(char* addr, size_t bytes) {
3457 DWORD old_status;
3458 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3459 }
3460
3461 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3462 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3463 void os::numa_make_global(char *addr, size_t bytes) { }
3464 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3465 bool os::numa_topology_changed() { return false; }
3466 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3467 int os::numa_get_group_id() { return 0; }
3468 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3469 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3470 // Provide an answer for UMA systems
3471 ids[0] = 0;
3472 return 1;
3473 } else {
3474 // check for size bigger than actual groups_num
3475 size = MIN2(size, numa_get_groups_num());
3476 for (int i = 0; i < (int)size; i++) {
3477 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3478 }
3479 return size;
3480 }
3481 }
3482
3483 bool os::get_page_info(char *start, page_info* info) {
3484 return false;
3485 }
3486
3487 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3488 page_info* page_found) {
3489 return end;
3490 }
3491
3492 char* os::non_memory_address_word() {
3493 // Must never look like an address returned by reserve_memory,
3494 // even in its subfields (as defined by the CPU immediate fields,
3495 // if the CPU splits constants across multiple instructions).
3496 return (char*)-1;
3497 }
3498
3499 #define MAX_ERROR_COUNT 100
3500 #define SYS_THREAD_ERROR 0xffffffffUL
3501
3502 void os::pd_start_thread(Thread* thread) {
3503 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3504 // Returns previous suspend state:
3505 // 0: Thread was not suspended
3506 // 1: Thread is running now
3507 // >1: Thread is still suspended.
3508 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3509 }
3510
3511 class HighResolutionInterval : public CHeapObj<mtThread> {
3512 // The default timer resolution seems to be 10 milliseconds.
3513 // (Where is this written down?)
3514 // If someone wants to sleep for only a fraction of the default,
3515 // then we set the timer resolution down to 1 millisecond for
3516 // the duration of their interval.
3517 // We carefully set the resolution back, since otherwise we
3518 // seem to incur an overhead (3%?) that we don't need.
3519 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3520 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3521 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3522 // timeBeginPeriod() if the relative error exceeded some threshold.
3523 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3524 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3525 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3526 // resolution timers running.
3527 private:
3528 jlong resolution;
3529 public:
3530 HighResolutionInterval(jlong ms) {
3531 resolution = ms % 10L;
3532 if (resolution != 0) {
3533 MMRESULT result = timeBeginPeriod(1L);
3534 }
3535 }
3536 ~HighResolutionInterval() {
3537 if (resolution != 0) {
3538 MMRESULT result = timeEndPeriod(1L);
3539 }
3540 resolution = 0L;
3541 }
3542 };
3543
3544 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3545 jlong limit = (jlong) MAXDWORD;
3546
3547 while (ms > limit) {
3548 int res;
3549 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3550 return res;
3551 }
3552 ms -= limit;
3553 }
3554
3555 assert(thread == Thread::current(), "thread consistency check");
3556 OSThread* osthread = thread->osthread();
3557 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3558 int result;
3559 if (interruptable) {
3560 assert(thread->is_Java_thread(), "must be java thread");
3561 JavaThread *jt = (JavaThread *) thread;
3562 ThreadBlockInVM tbivm(jt);
3563
3564 jt->set_suspend_equivalent();
3565 // cleared by handle_special_suspend_equivalent_condition() or
3566 // java_suspend_self() via check_and_wait_while_suspended()
3567
3568 HANDLE events[1];
3569 events[0] = osthread->interrupt_event();
3570 HighResolutionInterval *phri=NULL;
3571 if (!ForceTimeHighResolution) {
3572 phri = new HighResolutionInterval(ms);
3573 }
3574 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3575 result = OS_TIMEOUT;
3576 } else {
3577 ResetEvent(osthread->interrupt_event());
3578 osthread->set_interrupted(false);
3579 result = OS_INTRPT;
3580 }
3581 delete phri; //if it is NULL, harmless
3582
3583 // were we externally suspended while we were waiting?
3584 jt->check_and_wait_while_suspended();
3585 } else {
3586 assert(!thread->is_Java_thread(), "must not be java thread");
3587 Sleep((long) ms);
3588 result = OS_TIMEOUT;
3589 }
3590 return result;
3591 }
3592
3593 // Short sleep, direct OS call.
3594 //
3595 // ms = 0, means allow others (if any) to run.
3596 //
3597 void os::naked_short_sleep(jlong ms) {
3598 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3599 Sleep(ms);
3600 }
3601
3602 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3603 void os::infinite_sleep() {
3604 while (true) { // sleep forever ...
3605 Sleep(100000); // ... 100 seconds at a time
3606 }
3607 }
3608
3609 typedef BOOL (WINAPI * STTSignature)(void);
3610
3611 void os::naked_yield() {
3612 // Consider passing back the return value from SwitchToThread().
3613 SwitchToThread();
3614 }
3615
3616 // Win32 only gives you access to seven real priorities at a time,
3617 // so we compress Java's ten down to seven. It would be better
3618 // if we dynamically adjusted relative priorities.
3619
3620 int os::java_to_os_priority[CriticalPriority + 1] = {
3621 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3622 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3623 THREAD_PRIORITY_LOWEST, // 2
3624 THREAD_PRIORITY_BELOW_NORMAL, // 3
3625 THREAD_PRIORITY_BELOW_NORMAL, // 4
3626 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3627 THREAD_PRIORITY_NORMAL, // 6
3628 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3629 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3630 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3631 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3632 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3633 };
3634
3635 int prio_policy1[CriticalPriority + 1] = {
3636 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3637 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3638 THREAD_PRIORITY_LOWEST, // 2
3639 THREAD_PRIORITY_BELOW_NORMAL, // 3
3640 THREAD_PRIORITY_BELOW_NORMAL, // 4
3641 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3642 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3643 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3644 THREAD_PRIORITY_HIGHEST, // 8
3645 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3646 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3647 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3648 };
3649
3650 static int prio_init() {
3651 // If ThreadPriorityPolicy is 1, switch tables
3652 if (ThreadPriorityPolicy == 1) {
3653 int i;
3654 for (i = 0; i < CriticalPriority + 1; i++) {
3655 os::java_to_os_priority[i] = prio_policy1[i];
3656 }
3657 }
3658 if (UseCriticalJavaThreadPriority) {
3659 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3660 }
3661 return 0;
3662 }
3663
3664 OSReturn os::set_native_priority(Thread* thread, int priority) {
3665 if (!UseThreadPriorities) return OS_OK;
3666 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3667 return ret ? OS_OK : OS_ERR;
3668 }
3669
3670 OSReturn os::get_native_priority(const Thread* const thread,
3671 int* priority_ptr) {
3672 if (!UseThreadPriorities) {
3673 *priority_ptr = java_to_os_priority[NormPriority];
3674 return OS_OK;
3675 }
3676 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3677 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3678 assert(false, "GetThreadPriority failed");
3679 return OS_ERR;
3680 }
3681 *priority_ptr = os_prio;
3682 return OS_OK;
3683 }
3684
3685
3686 // Hint to the underlying OS that a task switch would not be good.
3687 // Void return because it's a hint and can fail.
3688 void os::hint_no_preempt() {}
3689
3690 void os::interrupt(Thread* thread) {
3691 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3692 Threads_lock->owned_by_self(),
3693 "possibility of dangling Thread pointer");
3694
3695 OSThread* osthread = thread->osthread();
3696 osthread->set_interrupted(true);
3697 // More than one thread can get here with the same value of osthread,
3698 // resulting in multiple notifications. We do, however, want the store
3699 // to interrupted() to be visible to other threads before we post
3700 // the interrupt event.
3701 OrderAccess::release();
3702 SetEvent(osthread->interrupt_event());
3703 // For JSR166: unpark after setting status
3704 if (thread->is_Java_thread()) {
3705 ((JavaThread*)thread)->parker()->unpark();
3706 }
3707
3708 ParkEvent * ev = thread->_ParkEvent;
3709 if (ev != NULL) ev->unpark();
3710 }
3711
3712
3713 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3714 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3715 "possibility of dangling Thread pointer");
3716
3717 OSThread* osthread = thread->osthread();
3718 // There is no synchronization between the setting of the interrupt
3719 // and it being cleared here. It is critical - see 6535709 - that
3720 // we only clear the interrupt state, and reset the interrupt event,
3721 // if we are going to report that we were indeed interrupted - else
3722 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3723 // depending on the timing. By checking thread interrupt event to see
3724 // if the thread gets real interrupt thus prevent spurious wakeup.
3725 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3726 if (interrupted && clear_interrupted) {
3727 osthread->set_interrupted(false);
3728 ResetEvent(osthread->interrupt_event());
3729 } // Otherwise leave the interrupted state alone
3730
3731 return interrupted;
3732 }
3733
3734 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3735 ExtendedPC os::get_thread_pc(Thread* thread) {
3736 CONTEXT context;
3737 context.ContextFlags = CONTEXT_CONTROL;
3738 HANDLE handle = thread->osthread()->thread_handle();
3739 #ifdef _M_IA64
3740 assert(0, "Fix get_thread_pc");
3741 return ExtendedPC(NULL);
3742 #else
3743 if (GetThreadContext(handle, &context)) {
3744 #ifdef _M_AMD64
3745 return ExtendedPC((address) context.Rip);
3746 #else
3747 return ExtendedPC((address) context.Eip);
3748 #endif
3749 } else {
3750 return ExtendedPC(NULL);
3751 }
3752 #endif
3753 }
3754
3755 // GetCurrentThreadId() returns DWORD
3756 intx os::current_thread_id() { return GetCurrentThreadId(); }
3757
3758 static int _initial_pid = 0;
3759
3760 int os::current_process_id() {
3761 return (_initial_pid ? _initial_pid : _getpid());
3762 }
3763
3764 int os::win32::_vm_page_size = 0;
3765 int os::win32::_vm_allocation_granularity = 0;
3766 int os::win32::_processor_type = 0;
3767 // Processor level is not available on non-NT systems, use vm_version instead
3768 int os::win32::_processor_level = 0;
3769 julong os::win32::_physical_memory = 0;
3770 size_t os::win32::_default_stack_size = 0;
3771
3772 intx os::win32::_os_thread_limit = 0;
3773 volatile intx os::win32::_os_thread_count = 0;
3774
3775 bool os::win32::_is_windows_server = false;
3776
3777 // 6573254
3778 // Currently, the bug is observed across all the supported Windows releases,
3779 // including the latest one (as of this writing - Windows Server 2012 R2)
3780 bool os::win32::_has_exit_bug = true;
3781
3782 void os::win32::initialize_system_info() {
3783 SYSTEM_INFO si;
3784 GetSystemInfo(&si);
3785 _vm_page_size = si.dwPageSize;
3786 _vm_allocation_granularity = si.dwAllocationGranularity;
3787 _processor_type = si.dwProcessorType;
3788 _processor_level = si.wProcessorLevel;
3789 set_processor_count(si.dwNumberOfProcessors);
3790
3791 MEMORYSTATUSEX ms;
3792 ms.dwLength = sizeof(ms);
3793
3794 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3795 // dwMemoryLoad (% of memory in use)
3796 GlobalMemoryStatusEx(&ms);
3797 _physical_memory = ms.ullTotalPhys;
3798
3799 OSVERSIONINFOEX oi;
3800 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3801 GetVersionEx((OSVERSIONINFO*)&oi);
3802 switch (oi.dwPlatformId) {
3803 case VER_PLATFORM_WIN32_NT:
3804 {
3805 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3806 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3807 oi.wProductType == VER_NT_SERVER) {
3808 _is_windows_server = true;
3809 }
3810 }
3811 break;
3812 default: fatal("Unknown platform");
3813 }
3814
3815 _default_stack_size = os::current_stack_size();
3816 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3817 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3818 "stack size not a multiple of page size");
3819
3820 initialize_performance_counter();
3821 }
3822
3823
3824 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3825 int ebuflen) {
3826 char path[MAX_PATH];
3827 DWORD size;
3828 DWORD pathLen = (DWORD)sizeof(path);
3829 HINSTANCE result = NULL;
3830
3831 // only allow library name without path component
3832 assert(strchr(name, '\\') == NULL, "path not allowed");
3833 assert(strchr(name, ':') == NULL, "path not allowed");
3834 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3835 jio_snprintf(ebuf, ebuflen,
3836 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3837 return NULL;
3838 }
3839
3840 // search system directory
3841 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3842 if (size >= pathLen) {
3843 return NULL; // truncated
3844 }
3845 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3846 return NULL; // truncated
3847 }
3848 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3849 return result;
3850 }
3851 }
3852
3853 // try Windows directory
3854 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3855 if (size >= pathLen) {
3856 return NULL; // truncated
3857 }
3858 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3859 return NULL; // truncated
3860 }
3861 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3862 return result;
3863 }
3864 }
3865
3866 jio_snprintf(ebuf, ebuflen,
3867 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3868 return NULL;
3869 }
3870
3871 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3872 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3873
3874 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3875 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3876 return TRUE;
3877 }
3878
3879 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3880 // Basic approach:
3881 // - Each exiting thread registers its intent to exit and then does so.
3882 // - A thread trying to terminate the process must wait for all
3883 // threads currently exiting to complete their exit.
3884
3885 if (os::win32::has_exit_bug()) {
3886 // The array holds handles of the threads that have started exiting by calling
3887 // _endthreadex().
3888 // Should be large enough to avoid blocking the exiting thread due to lack of
3889 // a free slot.
3890 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3891 static int handle_count = 0;
3892
3893 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3894 static CRITICAL_SECTION crit_sect;
3895 static volatile jint process_exiting = 0;
3896 int i, j;
3897 DWORD res;
3898 HANDLE hproc, hthr;
3899
3900 // We only attempt to register threads until a process exiting
3901 // thread manages to set the process_exiting flag. Any threads
3902 // that come through here after the process_exiting flag is set
3903 // are unregistered and will be caught in the SuspendThread()
3904 // infinite loop below.
3905 bool registered = false;
3906
3907 // The first thread that reached this point, initializes the critical section.
3908 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3909 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3910 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3911 if (what != EPT_THREAD) {
3912 // Atomically set process_exiting before the critical section
3913 // to increase the visibility between racing threads.
3914 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3915 }
3916 EnterCriticalSection(&crit_sect);
3917
3918 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3919 // Remove from the array those handles of the threads that have completed exiting.
3920 for (i = 0, j = 0; i < handle_count; ++i) {
3921 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3922 if (res == WAIT_TIMEOUT) {
3923 handles[j++] = handles[i];
3924 } else {
3925 if (res == WAIT_FAILED) {
3926 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3927 GetLastError(), __FILE__, __LINE__);
3928 }
3929 // Don't keep the handle, if we failed waiting for it.
3930 CloseHandle(handles[i]);
3931 }
3932 }
3933
3934 // If there's no free slot in the array of the kept handles, we'll have to
3935 // wait until at least one thread completes exiting.
3936 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3937 // Raise the priority of the oldest exiting thread to increase its chances
3938 // to complete sooner.
3939 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3940 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3941 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3942 i = (res - WAIT_OBJECT_0);
3943 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3944 for (; i < handle_count; ++i) {
3945 handles[i] = handles[i + 1];
3946 }
3947 } else {
3948 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3949 (res == WAIT_FAILED ? "failed" : "timed out"),
3950 GetLastError(), __FILE__, __LINE__);
3951 // Don't keep handles, if we failed waiting for them.
3952 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3953 CloseHandle(handles[i]);
3954 }
3955 handle_count = 0;
3956 }
3957 }
3958
3959 // Store a duplicate of the current thread handle in the array of handles.
3960 hproc = GetCurrentProcess();
3961 hthr = GetCurrentThread();
3962 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3963 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3964 warning("DuplicateHandle failed (%u) in %s: %d\n",
3965 GetLastError(), __FILE__, __LINE__);
3966
3967 // We can't register this thread (no more handles) so this thread
3968 // may be racing with a thread that is calling exit(). If the thread
3969 // that is calling exit() has managed to set the process_exiting
3970 // flag, then this thread will be caught in the SuspendThread()
3971 // infinite loop below which closes that race. A small timing
3972 // window remains before the process_exiting flag is set, but it
3973 // is only exposed when we are out of handles.
3974 } else {
3975 ++handle_count;
3976 registered = true;
3977
3978 // The current exiting thread has stored its handle in the array, and now
3979 // should leave the critical section before calling _endthreadex().
3980 }
3981
3982 } else if (what != EPT_THREAD && handle_count > 0) {
3983 jlong start_time, finish_time, timeout_left;
3984 // Before ending the process, make sure all the threads that had called
3985 // _endthreadex() completed.
3986
3987 // Set the priority level of the current thread to the same value as
3988 // the priority level of exiting threads.
3989 // This is to ensure it will be given a fair chance to execute if
3990 // the timeout expires.
3991 hthr = GetCurrentThread();
3992 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3993 start_time = os::javaTimeNanos();
3994 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3995 for (i = 0; ; ) {
3996 int portion_count = handle_count - i;
3997 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3998 portion_count = MAXIMUM_WAIT_OBJECTS;
3999 }
4000 for (j = 0; j < portion_count; ++j) {
4001 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4002 }
4003 timeout_left = (finish_time - start_time) / 1000000L;
4004 if (timeout_left < 0) {
4005 timeout_left = 0;
4006 }
4007 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4008 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4009 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4010 (res == WAIT_FAILED ? "failed" : "timed out"),
4011 GetLastError(), __FILE__, __LINE__);
4012 // Reset portion_count so we close the remaining
4013 // handles due to this error.
4014 portion_count = handle_count - i;
4015 }
4016 for (j = 0; j < portion_count; ++j) {
4017 CloseHandle(handles[i + j]);
4018 }
4019 if ((i += portion_count) >= handle_count) {
4020 break;
4021 }
4022 start_time = os::javaTimeNanos();
4023 }
4024 handle_count = 0;
4025 }
4026
4027 LeaveCriticalSection(&crit_sect);
4028 }
4029
4030 if (!registered &&
4031 OrderAccess::load_acquire(&process_exiting) != 0 &&
4032 process_exiting != (jint)GetCurrentThreadId()) {
4033 // Some other thread is about to call exit(), so we don't let
4034 // the current unregistered thread proceed to exit() or _endthreadex()
4035 while (true) {
4036 SuspendThread(GetCurrentThread());
4037 // Avoid busy-wait loop, if SuspendThread() failed.
4038 Sleep(EXIT_TIMEOUT);
4039 }
4040 }
4041 }
4042
4043 // We are here if either
4044 // - there's no 'race at exit' bug on this OS release;
4045 // - initialization of the critical section failed (unlikely);
4046 // - the current thread has registered itself and left the critical section;
4047 // - the process-exiting thread has raised the flag and left the critical section.
4048 if (what == EPT_THREAD) {
4049 _endthreadex((unsigned)exit_code);
4050 } else if (what == EPT_PROCESS) {
4051 ::exit(exit_code);
4052 } else {
4053 _exit(exit_code);
4054 }
4055
4056 // Should not reach here
4057 return exit_code;
4058 }
4059
4060 #undef EXIT_TIMEOUT
4061
4062 void os::win32::setmode_streams() {
4063 _setmode(_fileno(stdin), _O_BINARY);
4064 _setmode(_fileno(stdout), _O_BINARY);
4065 _setmode(_fileno(stderr), _O_BINARY);
4066 }
4067
4068
4069 bool os::is_debugger_attached() {
4070 return IsDebuggerPresent() ? true : false;
4071 }
4072
4073
4074 void os::wait_for_keypress_at_exit(void) {
4075 if (PauseAtExit) {
4076 fprintf(stderr, "Press any key to continue...\n");
4077 fgetc(stdin);
4078 }
4079 }
4080
4081
4082 bool os::message_box(const char* title, const char* message) {
4083 int result = MessageBox(NULL, message, title,
4084 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4085 return result == IDYES;
4086 }
4087
4088 #ifndef PRODUCT
4089 #ifndef _WIN64
4090 // Helpers to check whether NX protection is enabled
4091 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4092 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4093 pex->ExceptionRecord->NumberParameters > 0 &&
4094 pex->ExceptionRecord->ExceptionInformation[0] ==
4095 EXCEPTION_INFO_EXEC_VIOLATION) {
4096 return EXCEPTION_EXECUTE_HANDLER;
4097 }
4098 return EXCEPTION_CONTINUE_SEARCH;
4099 }
4100
4101 void nx_check_protection() {
4102 // If NX is enabled we'll get an exception calling into code on the stack
4103 char code[] = { (char)0xC3 }; // ret
4104 void *code_ptr = (void *)code;
4105 __try {
4106 __asm call code_ptr
4107 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4108 tty->print_raw_cr("NX protection detected.");
4109 }
4110 }
4111 #endif // _WIN64
4112 #endif // PRODUCT
4113
4114 // This is called _before_ the global arguments have been parsed
4115 void os::init(void) {
4116 _initial_pid = _getpid();
4117
4118 init_random(1234567);
4119
4120 win32::initialize_system_info();
4121 win32::setmode_streams();
4122 init_page_sizes((size_t) win32::vm_page_size());
4123
4124 // This may be overridden later when argument processing is done.
4125 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4126
4127 // Initialize main_process and main_thread
4128 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4129 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4130 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4131 fatal("DuplicateHandle failed\n");
4132 }
4133 main_thread_id = (int) GetCurrentThreadId();
4134
4135 // initialize fast thread access - only used for 32-bit
4136 win32::initialize_thread_ptr_offset();
4137 }
4138
4139 // To install functions for atexit processing
4140 extern "C" {
4141 static void perfMemory_exit_helper() {
4142 perfMemory_exit();
4143 }
4144 }
4145
4146 static jint initSock();
4147
4148 // this is called _after_ the global arguments have been parsed
4149 jint os::init_2(void) {
4150 // Allocate a single page and mark it as readable for safepoint polling
4151 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4152 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4153
4154 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4155 guarantee(return_page != NULL, "Commit Failed for polling page");
4156
4157 os::set_polling_page(polling_page);
4158 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4159
4160 if (!UseMembar) {
4161 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4162 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4163
4164 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4165 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4166
4167 os::set_memory_serialize_page(mem_serialize_page);
4168 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4169 }
4170
4171 // Setup Windows Exceptions
4172
4173 // for debugging float code generation bugs
4174 if (ForceFloatExceptions) {
4175 #ifndef _WIN64
4176 static long fp_control_word = 0;
4177 __asm { fstcw fp_control_word }
4178 // see Intel PPro Manual, Vol. 2, p 7-16
4179 const long precision = 0x20;
4180 const long underflow = 0x10;
4181 const long overflow = 0x08;
4182 const long zero_div = 0x04;
4183 const long denorm = 0x02;
4184 const long invalid = 0x01;
4185 fp_control_word |= invalid;
4186 __asm { fldcw fp_control_word }
4187 #endif
4188 }
4189
4190 // If stack_commit_size is 0, windows will reserve the default size,
4191 // but only commit a small portion of it.
4192 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4193 size_t default_reserve_size = os::win32::default_stack_size();
4194 size_t actual_reserve_size = stack_commit_size;
4195 if (stack_commit_size < default_reserve_size) {
4196 // If stack_commit_size == 0, we want this too
4197 actual_reserve_size = default_reserve_size;
4198 }
4199
4200 // Check minimum allowable stack size for thread creation and to initialize
4201 // the java system classes, including StackOverflowError - depends on page
4202 // size. Add two 4K pages for compiler2 recursion in main thread.
4203 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4204 // class initialization depending on 32 or 64 bit VM.
4205 size_t min_stack_allowed =
4206 (size_t)(JavaThread::stack_guard_zone_size() +
4207 JavaThread::stack_shadow_zone_size() +
4208 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4209
4210 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size());
4211
4212 if (actual_reserve_size < min_stack_allowed) {
4213 tty->print_cr("\nThe stack size specified is too small, "
4214 "Specify at least %dk",
4215 min_stack_allowed / K);
4216 return JNI_ERR;
4217 }
4218
4219 JavaThread::set_stack_size_at_create(stack_commit_size);
4220
4221 // Calculate theoretical max. size of Threads to guard gainst artifical
4222 // out-of-memory situations, where all available address-space has been
4223 // reserved by thread stacks.
4224 assert(actual_reserve_size != 0, "Must have a stack");
4225
4226 // Calculate the thread limit when we should start doing Virtual Memory
4227 // banging. Currently when the threads will have used all but 200Mb of space.
4228 //
4229 // TODO: consider performing a similar calculation for commit size instead
4230 // as reserve size, since on a 64-bit platform we'll run into that more
4231 // often than running out of virtual memory space. We can use the
4232 // lower value of the two calculations as the os_thread_limit.
4233 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4234 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4235
4236 // at exit methods are called in the reverse order of their registration.
4237 // there is no limit to the number of functions registered. atexit does
4238 // not set errno.
4239
4240 if (PerfAllowAtExitRegistration) {
4241 // only register atexit functions if PerfAllowAtExitRegistration is set.
4242 // atexit functions can be delayed until process exit time, which
4243 // can be problematic for embedded VM situations. Embedded VMs should
4244 // call DestroyJavaVM() to assure that VM resources are released.
4245
4246 // note: perfMemory_exit_helper atexit function may be removed in
4247 // the future if the appropriate cleanup code can be added to the
4248 // VM_Exit VMOperation's doit method.
4249 if (atexit(perfMemory_exit_helper) != 0) {
4250 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4251 }
4252 }
4253
4254 #ifndef _WIN64
4255 // Print something if NX is enabled (win32 on AMD64)
4256 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4257 #endif
4258
4259 // initialize thread priority policy
4260 prio_init();
4261
4262 if (UseNUMA && !ForceNUMA) {
4263 UseNUMA = false; // We don't fully support this yet
4264 }
4265
4266 if (UseNUMAInterleaving) {
4267 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4268 bool success = numa_interleaving_init();
4269 if (!success) UseNUMAInterleaving = false;
4270 }
4271
4272 if (initSock() != JNI_OK) {
4273 return JNI_ERR;
4274 }
4275
4276 return JNI_OK;
4277 }
4278
4279 // Mark the polling page as unreadable
4280 void os::make_polling_page_unreadable(void) {
4281 DWORD old_status;
4282 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4283 PAGE_NOACCESS, &old_status)) {
4284 fatal("Could not disable polling page");
4285 }
4286 }
4287
4288 // Mark the polling page as readable
4289 void os::make_polling_page_readable(void) {
4290 DWORD old_status;
4291 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4292 PAGE_READONLY, &old_status)) {
4293 fatal("Could not enable polling page");
4294 }
4295 }
4296
4297
4298 int os::stat(const char *path, struct stat *sbuf) {
4299 char pathbuf[MAX_PATH];
4300 if (strlen(path) > MAX_PATH - 1) {
4301 errno = ENAMETOOLONG;
4302 return -1;
4303 }
4304 os::native_path(strcpy(pathbuf, path));
4305 int ret = ::stat(pathbuf, sbuf);
4306 if (sbuf != NULL && UseUTCFileTimestamp) {
4307 // Fix for 6539723. st_mtime returned from stat() is dependent on
4308 // the system timezone and so can return different values for the
4309 // same file if/when daylight savings time changes. This adjustment
4310 // makes sure the same timestamp is returned regardless of the TZ.
4311 //
4312 // See:
4313 // http://msdn.microsoft.com/library/
4314 // default.asp?url=/library/en-us/sysinfo/base/
4315 // time_zone_information_str.asp
4316 // and
4317 // http://msdn.microsoft.com/library/default.asp?url=
4318 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4319 //
4320 // NOTE: there is a insidious bug here: If the timezone is changed
4321 // after the call to stat() but before 'GetTimeZoneInformation()', then
4322 // the adjustment we do here will be wrong and we'll return the wrong
4323 // value (which will likely end up creating an invalid class data
4324 // archive). Absent a better API for this, or some time zone locking
4325 // mechanism, we'll have to live with this risk.
4326 TIME_ZONE_INFORMATION tz;
4327 DWORD tzid = GetTimeZoneInformation(&tz);
4328 int daylightBias =
4329 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4330 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4331 }
4332 return ret;
4333 }
4334
4335
4336 #define FT2INT64(ft) \
4337 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4338
4339
4340 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4341 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4342 // of a thread.
4343 //
4344 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4345 // the fast estimate available on the platform.
4346
4347 // current_thread_cpu_time() is not optimized for Windows yet
4348 jlong os::current_thread_cpu_time() {
4349 // return user + sys since the cost is the same
4350 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4351 }
4352
4353 jlong os::thread_cpu_time(Thread* thread) {
4354 // consistent with what current_thread_cpu_time() returns.
4355 return os::thread_cpu_time(thread, true /* user+sys */);
4356 }
4357
4358 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4359 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4360 }
4361
4362 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4363 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4364 // If this function changes, os::is_thread_cpu_time_supported() should too
4365 FILETIME CreationTime;
4366 FILETIME ExitTime;
4367 FILETIME KernelTime;
4368 FILETIME UserTime;
4369
4370 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4371 &ExitTime, &KernelTime, &UserTime) == 0) {
4372 return -1;
4373 } else if (user_sys_cpu_time) {
4374 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4375 } else {
4376 return FT2INT64(UserTime) * 100;
4377 }
4378 }
4379
4380 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4381 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4382 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4383 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4384 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4385 }
4386
4387 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4388 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4389 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4390 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4391 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4392 }
4393
4394 bool os::is_thread_cpu_time_supported() {
4395 // see os::thread_cpu_time
4396 FILETIME CreationTime;
4397 FILETIME ExitTime;
4398 FILETIME KernelTime;
4399 FILETIME UserTime;
4400
4401 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4402 &KernelTime, &UserTime) == 0) {
4403 return false;
4404 } else {
4405 return true;
4406 }
4407 }
4408
4409 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4410 // It does have primitives (PDH API) to get CPU usage and run queue length.
4411 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4412 // If we wanted to implement loadavg on Windows, we have a few options:
4413 //
4414 // a) Query CPU usage and run queue length and "fake" an answer by
4415 // returning the CPU usage if it's under 100%, and the run queue
4416 // length otherwise. It turns out that querying is pretty slow
4417 // on Windows, on the order of 200 microseconds on a fast machine.
4418 // Note that on the Windows the CPU usage value is the % usage
4419 // since the last time the API was called (and the first call
4420 // returns 100%), so we'd have to deal with that as well.
4421 //
4422 // b) Sample the "fake" answer using a sampling thread and store
4423 // the answer in a global variable. The call to loadavg would
4424 // just return the value of the global, avoiding the slow query.
4425 //
4426 // c) Sample a better answer using exponential decay to smooth the
4427 // value. This is basically the algorithm used by UNIX kernels.
4428 //
4429 // Note that sampling thread starvation could affect both (b) and (c).
4430 int os::loadavg(double loadavg[], int nelem) {
4431 return -1;
4432 }
4433
4434
4435 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4436 bool os::dont_yield() {
4437 return DontYieldALot;
4438 }
4439
4440 // This method is a slightly reworked copy of JDK's sysOpen
4441 // from src/windows/hpi/src/sys_api_md.c
4442
4443 int os::open(const char *path, int oflag, int mode) {
4444 char pathbuf[MAX_PATH];
4445
4446 if (strlen(path) > MAX_PATH - 1) {
4447 errno = ENAMETOOLONG;
4448 return -1;
4449 }
4450 os::native_path(strcpy(pathbuf, path));
4451 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4452 }
4453
4454 FILE* os::open(int fd, const char* mode) {
4455 return ::_fdopen(fd, mode);
4456 }
4457
4458 // Is a (classpath) directory empty?
4459 bool os::dir_is_empty(const char* path) {
4460 WIN32_FIND_DATA fd;
4461 HANDLE f = FindFirstFile(path, &fd);
4462 if (f == INVALID_HANDLE_VALUE) {
4463 return true;
4464 }
4465 FindClose(f);
4466 return false;
4467 }
4468
4469 // create binary file, rewriting existing file if required
4470 int os::create_binary_file(const char* path, bool rewrite_existing) {
4471 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4472 if (!rewrite_existing) {
4473 oflags |= _O_EXCL;
4474 }
4475 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4476 }
4477
4478 // return current position of file pointer
4479 jlong os::current_file_offset(int fd) {
4480 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4481 }
4482
4483 // move file pointer to the specified offset
4484 jlong os::seek_to_file_offset(int fd, jlong offset) {
4485 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4486 }
4487
4488
4489 jlong os::lseek(int fd, jlong offset, int whence) {
4490 return (jlong) ::_lseeki64(fd, offset, whence);
4491 }
4492
4493 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4494 OVERLAPPED ov;
4495 DWORD nread;
4496 BOOL result;
4497
4498 ZeroMemory(&ov, sizeof(ov));
4499 ov.Offset = (DWORD)offset;
4500 ov.OffsetHigh = (DWORD)(offset >> 32);
4501
4502 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4503
4504 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4505
4506 return result ? nread : 0;
4507 }
4508
4509
4510 // This method is a slightly reworked copy of JDK's sysNativePath
4511 // from src/windows/hpi/src/path_md.c
4512
4513 // Convert a pathname to native format. On win32, this involves forcing all
4514 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4515 // sometimes rejects '/') and removing redundant separators. The input path is
4516 // assumed to have been converted into the character encoding used by the local
4517 // system. Because this might be a double-byte encoding, care is taken to
4518 // treat double-byte lead characters correctly.
4519 //
4520 // This procedure modifies the given path in place, as the result is never
4521 // longer than the original. There is no error return; this operation always
4522 // succeeds.
4523 char * os::native_path(char *path) {
4524 char *src = path, *dst = path, *end = path;
4525 char *colon = NULL; // If a drive specifier is found, this will
4526 // point to the colon following the drive letter
4527
4528 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4529 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4530 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4531
4532 // Check for leading separators
4533 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4534 while (isfilesep(*src)) {
4535 src++;
4536 }
4537
4538 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4539 // Remove leading separators if followed by drive specifier. This
4540 // hack is necessary to support file URLs containing drive
4541 // specifiers (e.g., "file://c:/path"). As a side effect,
4542 // "/c:/path" can be used as an alternative to "c:/path".
4543 *dst++ = *src++;
4544 colon = dst;
4545 *dst++ = ':';
4546 src++;
4547 } else {
4548 src = path;
4549 if (isfilesep(src[0]) && isfilesep(src[1])) {
4550 // UNC pathname: Retain first separator; leave src pointed at
4551 // second separator so that further separators will be collapsed
4552 // into the second separator. The result will be a pathname
4553 // beginning with "\\\\" followed (most likely) by a host name.
4554 src = dst = path + 1;
4555 path[0] = '\\'; // Force first separator to '\\'
4556 }
4557 }
4558
4559 end = dst;
4560
4561 // Remove redundant separators from remainder of path, forcing all
4562 // separators to be '\\' rather than '/'. Also, single byte space
4563 // characters are removed from the end of the path because those
4564 // are not legal ending characters on this operating system.
4565 //
4566 while (*src != '\0') {
4567 if (isfilesep(*src)) {
4568 *dst++ = '\\'; src++;
4569 while (isfilesep(*src)) src++;
4570 if (*src == '\0') {
4571 // Check for trailing separator
4572 end = dst;
4573 if (colon == dst - 2) break; // "z:\\"
4574 if (dst == path + 1) break; // "\\"
4575 if (dst == path + 2 && isfilesep(path[0])) {
4576 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4577 // beginning of a UNC pathname. Even though it is not, by
4578 // itself, a valid UNC pathname, we leave it as is in order
4579 // to be consistent with the path canonicalizer as well
4580 // as the win32 APIs, which treat this case as an invalid
4581 // UNC pathname rather than as an alias for the root
4582 // directory of the current drive.
4583 break;
4584 }
4585 end = --dst; // Path does not denote a root directory, so
4586 // remove trailing separator
4587 break;
4588 }
4589 end = dst;
4590 } else {
4591 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4592 *dst++ = *src++;
4593 if (*src) *dst++ = *src++;
4594 end = dst;
4595 } else { // Copy a single-byte character
4596 char c = *src++;
4597 *dst++ = c;
4598 // Space is not a legal ending character
4599 if (c != ' ') end = dst;
4600 }
4601 }
4602 }
4603
4604 *end = '\0';
4605
4606 // For "z:", add "." to work around a bug in the C runtime library
4607 if (colon == dst - 1) {
4608 path[2] = '.';
4609 path[3] = '\0';
4610 }
4611
4612 return path;
4613 }
4614
4615 // This code is a copy of JDK's sysSetLength
4616 // from src/windows/hpi/src/sys_api_md.c
4617
4618 int os::ftruncate(int fd, jlong length) {
4619 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4620 long high = (long)(length >> 32);
4621 DWORD ret;
4622
4623 if (h == (HANDLE)(-1)) {
4624 return -1;
4625 }
4626
4627 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4628 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4629 return -1;
4630 }
4631
4632 if (::SetEndOfFile(h) == FALSE) {
4633 return -1;
4634 }
4635
4636 return 0;
4637 }
4638
4639 int os::get_fileno(FILE* fp) {
4640 return _fileno(fp);
4641 }
4642
4643 // This code is a copy of JDK's sysSync
4644 // from src/windows/hpi/src/sys_api_md.c
4645 // except for the legacy workaround for a bug in Win 98
4646
4647 int os::fsync(int fd) {
4648 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4649
4650 if ((!::FlushFileBuffers(handle)) &&
4651 (GetLastError() != ERROR_ACCESS_DENIED)) {
4652 // from winerror.h
4653 return -1;
4654 }
4655 return 0;
4656 }
4657
4658 static int nonSeekAvailable(int, long *);
4659 static int stdinAvailable(int, long *);
4660
4661 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4662 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4663
4664 // This code is a copy of JDK's sysAvailable
4665 // from src/windows/hpi/src/sys_api_md.c
4666
4667 int os::available(int fd, jlong *bytes) {
4668 jlong cur, end;
4669 struct _stati64 stbuf64;
4670
4671 if (::_fstati64(fd, &stbuf64) >= 0) {
4672 int mode = stbuf64.st_mode;
4673 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4674 int ret;
4675 long lpbytes;
4676 if (fd == 0) {
4677 ret = stdinAvailable(fd, &lpbytes);
4678 } else {
4679 ret = nonSeekAvailable(fd, &lpbytes);
4680 }
4681 (*bytes) = (jlong)(lpbytes);
4682 return ret;
4683 }
4684 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4685 return FALSE;
4686 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4687 return FALSE;
4688 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4689 return FALSE;
4690 }
4691 *bytes = end - cur;
4692 return TRUE;
4693 } else {
4694 return FALSE;
4695 }
4696 }
4697
4698 void os::flockfile(FILE* fp) {
4699 _lock_file(fp);
4700 }
4701
4702 void os::funlockfile(FILE* fp) {
4703 _unlock_file(fp);
4704 }
4705
4706 // This code is a copy of JDK's nonSeekAvailable
4707 // from src/windows/hpi/src/sys_api_md.c
4708
4709 static int nonSeekAvailable(int fd, long *pbytes) {
4710 // This is used for available on non-seekable devices
4711 // (like both named and anonymous pipes, such as pipes
4712 // connected to an exec'd process).
4713 // Standard Input is a special case.
4714 HANDLE han;
4715
4716 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4717 return FALSE;
4718 }
4719
4720 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4721 // PeekNamedPipe fails when at EOF. In that case we
4722 // simply make *pbytes = 0 which is consistent with the
4723 // behavior we get on Solaris when an fd is at EOF.
4724 // The only alternative is to raise an Exception,
4725 // which isn't really warranted.
4726 //
4727 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4728 return FALSE;
4729 }
4730 *pbytes = 0;
4731 }
4732 return TRUE;
4733 }
4734
4735 #define MAX_INPUT_EVENTS 2000
4736
4737 // This code is a copy of JDK's stdinAvailable
4738 // from src/windows/hpi/src/sys_api_md.c
4739
4740 static int stdinAvailable(int fd, long *pbytes) {
4741 HANDLE han;
4742 DWORD numEventsRead = 0; // Number of events read from buffer
4743 DWORD numEvents = 0; // Number of events in buffer
4744 DWORD i = 0; // Loop index
4745 DWORD curLength = 0; // Position marker
4746 DWORD actualLength = 0; // Number of bytes readable
4747 BOOL error = FALSE; // Error holder
4748 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4749
4750 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4751 return FALSE;
4752 }
4753
4754 // Construct an array of input records in the console buffer
4755 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4756 if (error == 0) {
4757 return nonSeekAvailable(fd, pbytes);
4758 }
4759
4760 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4761 if (numEvents > MAX_INPUT_EVENTS) {
4762 numEvents = MAX_INPUT_EVENTS;
4763 }
4764
4765 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4766 if (lpBuffer == NULL) {
4767 return FALSE;
4768 }
4769
4770 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4771 if (error == 0) {
4772 os::free(lpBuffer);
4773 return FALSE;
4774 }
4775
4776 // Examine input records for the number of bytes available
4777 for (i=0; i<numEvents; i++) {
4778 if (lpBuffer[i].EventType == KEY_EVENT) {
4779
4780 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4781 &(lpBuffer[i].Event);
4782 if (keyRecord->bKeyDown == TRUE) {
4783 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4784 curLength++;
4785 if (*keyPressed == '\r') {
4786 actualLength = curLength;
4787 }
4788 }
4789 }
4790 }
4791
4792 if (lpBuffer != NULL) {
4793 os::free(lpBuffer);
4794 }
4795
4796 *pbytes = (long) actualLength;
4797 return TRUE;
4798 }
4799
4800 // Map a block of memory.
4801 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4802 char *addr, size_t bytes, bool read_only,
4803 bool allow_exec) {
4804 HANDLE hFile;
4805 char* base;
4806
4807 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4808 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4809 if (hFile == NULL) {
4810 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4811 return NULL;
4812 }
4813
4814 if (allow_exec) {
4815 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4816 // unless it comes from a PE image (which the shared archive is not.)
4817 // Even VirtualProtect refuses to give execute access to mapped memory
4818 // that was not previously executable.
4819 //
4820 // Instead, stick the executable region in anonymous memory. Yuck.
4821 // Penalty is that ~4 pages will not be shareable - in the future
4822 // we might consider DLLizing the shared archive with a proper PE
4823 // header so that mapping executable + sharing is possible.
4824
4825 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4826 PAGE_READWRITE);
4827 if (base == NULL) {
4828 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4829 CloseHandle(hFile);
4830 return NULL;
4831 }
4832
4833 DWORD bytes_read;
4834 OVERLAPPED overlapped;
4835 overlapped.Offset = (DWORD)file_offset;
4836 overlapped.OffsetHigh = 0;
4837 overlapped.hEvent = NULL;
4838 // ReadFile guarantees that if the return value is true, the requested
4839 // number of bytes were read before returning.
4840 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4841 if (!res) {
4842 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4843 release_memory(base, bytes);
4844 CloseHandle(hFile);
4845 return NULL;
4846 }
4847 } else {
4848 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4849 NULL /* file_name */);
4850 if (hMap == NULL) {
4851 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4852 CloseHandle(hFile);
4853 return NULL;
4854 }
4855
4856 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4857 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4858 (DWORD)bytes, addr);
4859 if (base == NULL) {
4860 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4861 CloseHandle(hMap);
4862 CloseHandle(hFile);
4863 return NULL;
4864 }
4865
4866 if (CloseHandle(hMap) == 0) {
4867 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4868 CloseHandle(hFile);
4869 return base;
4870 }
4871 }
4872
4873 if (allow_exec) {
4874 DWORD old_protect;
4875 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4876 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4877
4878 if (!res) {
4879 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4880 // Don't consider this a hard error, on IA32 even if the
4881 // VirtualProtect fails, we should still be able to execute
4882 CloseHandle(hFile);
4883 return base;
4884 }
4885 }
4886
4887 if (CloseHandle(hFile) == 0) {
4888 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4889 return base;
4890 }
4891
4892 return base;
4893 }
4894
4895
4896 // Remap a block of memory.
4897 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4898 char *addr, size_t bytes, bool read_only,
4899 bool allow_exec) {
4900 // This OS does not allow existing memory maps to be remapped so we
4901 // have to unmap the memory before we remap it.
4902 if (!os::unmap_memory(addr, bytes)) {
4903 return NULL;
4904 }
4905
4906 // There is a very small theoretical window between the unmap_memory()
4907 // call above and the map_memory() call below where a thread in native
4908 // code may be able to access an address that is no longer mapped.
4909
4910 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4911 read_only, allow_exec);
4912 }
4913
4914
4915 // Unmap a block of memory.
4916 // Returns true=success, otherwise false.
4917
4918 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4919 MEMORY_BASIC_INFORMATION mem_info;
4920 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4921 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4922 return false;
4923 }
4924
4925 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4926 // Instead, executable region was allocated using VirtualAlloc(). See
4927 // pd_map_memory() above.
4928 //
4929 // The following flags should match the 'exec_access' flages used for
4930 // VirtualProtect() in pd_map_memory().
4931 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4932 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4933 return pd_release_memory(addr, bytes);
4934 }
4935
4936 BOOL result = UnmapViewOfFile(addr);
4937 if (result == 0) {
4938 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4939 return false;
4940 }
4941 return true;
4942 }
4943
4944 void os::pause() {
4945 char filename[MAX_PATH];
4946 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4947 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4948 } else {
4949 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4950 }
4951
4952 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4953 if (fd != -1) {
4954 struct stat buf;
4955 ::close(fd);
4956 while (::stat(filename, &buf) == 0) {
4957 Sleep(100);
4958 }
4959 } else {
4960 jio_fprintf(stderr,
4961 "Could not open pause file '%s', continuing immediately.\n", filename);
4962 }
4963 }
4964
4965 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4966 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4967 }
4968
4969 // See the caveats for this class in os_windows.hpp
4970 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4971 // into this method and returns false. If no OS EXCEPTION was raised, returns
4972 // true.
4973 // The callback is supposed to provide the method that should be protected.
4974 //
4975 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4976 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4977 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4978 "crash_protection already set?");
4979
4980 bool success = true;
4981 __try {
4982 WatcherThread::watcher_thread()->set_crash_protection(this);
4983 cb.call();
4984 } __except(EXCEPTION_EXECUTE_HANDLER) {
4985 // only for protection, nothing to do
4986 success = false;
4987 }
4988 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4989 return success;
4990 }
4991
4992 // An Event wraps a win32 "CreateEvent" kernel handle.
4993 //
4994 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4995 //
4996 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4997 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4998 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4999 // In addition, an unpark() operation might fetch the handle field, but the
5000 // event could recycle between the fetch and the SetEvent() operation.
5001 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5002 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5003 // on an stale but recycled handle would be harmless, but in practice this might
5004 // confuse other non-Sun code, so it's not a viable approach.
5005 //
5006 // 2: Once a win32 event handle is associated with an Event, it remains associated
5007 // with the Event. The event handle is never closed. This could be construed
5008 // as handle leakage, but only up to the maximum # of threads that have been extant
5009 // at any one time. This shouldn't be an issue, as windows platforms typically
5010 // permit a process to have hundreds of thousands of open handles.
5011 //
5012 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5013 // and release unused handles.
5014 //
5015 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5016 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5017 //
5018 // 5. Use an RCU-like mechanism (Read-Copy Update).
5019 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5020 //
5021 // We use (2).
5022 //
5023 // TODO-FIXME:
5024 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5025 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5026 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5027 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5028 // into a single win32 CreateEvent() handle.
5029 //
5030 // Assumption:
5031 // Only one parker can exist on an event, which is why we allocate
5032 // them per-thread. Multiple unparkers can coexist.
5033 //
5034 // _Event transitions in park()
5035 // -1 => -1 : illegal
5036 // 1 => 0 : pass - return immediately
5037 // 0 => -1 : block; then set _Event to 0 before returning
5038 //
5039 // _Event transitions in unpark()
5040 // 0 => 1 : just return
5041 // 1 => 1 : just return
5042 // -1 => either 0 or 1; must signal target thread
5043 // That is, we can safely transition _Event from -1 to either
5044 // 0 or 1.
5045 //
5046 // _Event serves as a restricted-range semaphore.
5047 // -1 : thread is blocked, i.e. there is a waiter
5048 // 0 : neutral: thread is running or ready,
5049 // could have been signaled after a wait started
5050 // 1 : signaled - thread is running or ready
5051 //
5052 // Another possible encoding of _Event would be with
5053 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5054 //
5055
5056 int os::PlatformEvent::park(jlong Millis) {
5057 // Transitions for _Event:
5058 // -1 => -1 : illegal
5059 // 1 => 0 : pass - return immediately
5060 // 0 => -1 : block; then set _Event to 0 before returning
5061
5062 guarantee(_ParkHandle != NULL , "Invariant");
5063 guarantee(Millis > 0 , "Invariant");
5064
5065 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5066 // the initial park() operation.
5067 // Consider: use atomic decrement instead of CAS-loop
5068
5069 int v;
5070 for (;;) {
5071 v = _Event;
5072 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5073 }
5074 guarantee((v == 0) || (v == 1), "invariant");
5075 if (v != 0) return OS_OK;
5076
5077 // Do this the hard way by blocking ...
5078 // TODO: consider a brief spin here, gated on the success of recent
5079 // spin attempts by this thread.
5080 //
5081 // We decompose long timeouts into series of shorter timed waits.
5082 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5083 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5084 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5085 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5086 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5087 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5088 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5089 // for the already waited time. This policy does not admit any new outcomes.
5090 // In the future, however, we might want to track the accumulated wait time and
5091 // adjust Millis accordingly if we encounter a spurious wakeup.
5092
5093 const int MAXTIMEOUT = 0x10000000;
5094 DWORD rv = WAIT_TIMEOUT;
5095 while (_Event < 0 && Millis > 0) {
5096 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5097 if (Millis > MAXTIMEOUT) {
5098 prd = MAXTIMEOUT;
5099 }
5100 rv = ::WaitForSingleObject(_ParkHandle, prd);
5101 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5102 if (rv == WAIT_TIMEOUT) {
5103 Millis -= prd;
5104 }
5105 }
5106 v = _Event;
5107 _Event = 0;
5108 // see comment at end of os::PlatformEvent::park() below:
5109 OrderAccess::fence();
5110 // If we encounter a nearly simultanous timeout expiry and unpark()
5111 // we return OS_OK indicating we awoke via unpark().
5112 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5113 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5114 }
5115
5116 void os::PlatformEvent::park() {
5117 // Transitions for _Event:
5118 // -1 => -1 : illegal
5119 // 1 => 0 : pass - return immediately
5120 // 0 => -1 : block; then set _Event to 0 before returning
5121
5122 guarantee(_ParkHandle != NULL, "Invariant");
5123 // Invariant: Only the thread associated with the Event/PlatformEvent
5124 // may call park().
5125 // Consider: use atomic decrement instead of CAS-loop
5126 int v;
5127 for (;;) {
5128 v = _Event;
5129 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5130 }
5131 guarantee((v == 0) || (v == 1), "invariant");
5132 if (v != 0) return;
5133
5134 // Do this the hard way by blocking ...
5135 // TODO: consider a brief spin here, gated on the success of recent
5136 // spin attempts by this thread.
5137 while (_Event < 0) {
5138 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5139 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5140 }
5141
5142 // Usually we'll find _Event == 0 at this point, but as
5143 // an optional optimization we clear it, just in case can
5144 // multiple unpark() operations drove _Event up to 1.
5145 _Event = 0;
5146 OrderAccess::fence();
5147 guarantee(_Event >= 0, "invariant");
5148 }
5149
5150 void os::PlatformEvent::unpark() {
5151 guarantee(_ParkHandle != NULL, "Invariant");
5152
5153 // Transitions for _Event:
5154 // 0 => 1 : just return
5155 // 1 => 1 : just return
5156 // -1 => either 0 or 1; must signal target thread
5157 // That is, we can safely transition _Event from -1 to either
5158 // 0 or 1.
5159 // See also: "Semaphores in Plan 9" by Mullender & Cox
5160 //
5161 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5162 // that it will take two back-to-back park() calls for the owning
5163 // thread to block. This has the benefit of forcing a spurious return
5164 // from the first park() call after an unpark() call which will help
5165 // shake out uses of park() and unpark() without condition variables.
5166
5167 if (Atomic::xchg(1, &_Event) >= 0) return;
5168
5169 ::SetEvent(_ParkHandle);
5170 }
5171
5172
5173 // JSR166
5174 // -------------------------------------------------------
5175
5176 // The Windows implementation of Park is very straightforward: Basic
5177 // operations on Win32 Events turn out to have the right semantics to
5178 // use them directly. We opportunistically resuse the event inherited
5179 // from Monitor.
5180
5181 void Parker::park(bool isAbsolute, jlong time) {
5182 guarantee(_ParkEvent != NULL, "invariant");
5183 // First, demultiplex/decode time arguments
5184 if (time < 0) { // don't wait
5185 return;
5186 } else if (time == 0 && !isAbsolute) {
5187 time = INFINITE;
5188 } else if (isAbsolute) {
5189 time -= os::javaTimeMillis(); // convert to relative time
5190 if (time <= 0) { // already elapsed
5191 return;
5192 }
5193 } else { // relative
5194 time /= 1000000; // Must coarsen from nanos to millis
5195 if (time == 0) { // Wait for the minimal time unit if zero
5196 time = 1;
5197 }
5198 }
5199
5200 JavaThread* thread = JavaThread::current();
5201
5202 // Don't wait if interrupted or already triggered
5203 if (Thread::is_interrupted(thread, false) ||
5204 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5205 ResetEvent(_ParkEvent);
5206 return;
5207 } else {
5208 ThreadBlockInVM tbivm(thread);
5209 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5210 thread->set_suspend_equivalent();
5211
5212 WaitForSingleObject(_ParkEvent, time);
5213 ResetEvent(_ParkEvent);
5214
5215 // If externally suspended while waiting, re-suspend
5216 if (thread->handle_special_suspend_equivalent_condition()) {
5217 thread->java_suspend_self();
5218 }
5219 }
5220 }
5221
5222 void Parker::unpark() {
5223 guarantee(_ParkEvent != NULL, "invariant");
5224 SetEvent(_ParkEvent);
5225 }
5226
5227 // Run the specified command in a separate process. Return its exit value,
5228 // or -1 on failure (e.g. can't create a new process).
5229 int os::fork_and_exec(char* cmd) {
5230 STARTUPINFO si;
5231 PROCESS_INFORMATION pi;
5232
5233 memset(&si, 0, sizeof(si));
5234 si.cb = sizeof(si);
5235 memset(&pi, 0, sizeof(pi));
5236 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5237 cmd, // command line
5238 NULL, // process security attribute
5239 NULL, // thread security attribute
5240 TRUE, // inherits system handles
5241 0, // no creation flags
5242 NULL, // use parent's environment block
5243 NULL, // use parent's starting directory
5244 &si, // (in) startup information
5245 &pi); // (out) process information
5246
5247 if (rslt) {
5248 // Wait until child process exits.
5249 WaitForSingleObject(pi.hProcess, INFINITE);
5250
5251 DWORD exit_code;
5252 GetExitCodeProcess(pi.hProcess, &exit_code);
5253
5254 // Close process and thread handles.
5255 CloseHandle(pi.hProcess);
5256 CloseHandle(pi.hThread);
5257
5258 return (int)exit_code;
5259 } else {
5260 return -1;
5261 }
5262 }
5263
5264 //--------------------------------------------------------------------------------------------------
5265 // Non-product code
5266
5267 static int mallocDebugIntervalCounter = 0;
5268 static int mallocDebugCounter = 0;
5269
5270 // For debugging possible bugs inside HeapWalk (a ring buffer)
5271 #define SAVE_COUNT 8
5272 static PROCESS_HEAP_ENTRY saved_heap_entries[SAVE_COUNT];
5273 static int saved_heap_entry_index;
5274
5275 bool os::check_heap(bool force) {
5276 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5277 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5278 // Note: HeapValidate executes two hardware breakpoints when it finds something
5279 // wrong; at these points, eax contains the address of the offending block (I think).
5280 // To get to the exlicit error message(s) below, just continue twice.
5281 //
5282 // Note: we want to check the CRT heap, which is not necessarily located in the
5283 // process default heap.
5284 HANDLE heap = (HANDLE) _get_heap_handle();
5285 if (!heap) {
5286 return true;
5287 }
5288
5289 // If we fail to lock the heap, then gflags.exe has been used
5290 // or some other special heap flag has been set that prevents
5291 // locking. We don't try to walk a heap we can't lock.
5292 if (HeapLock(heap) != 0) {
5293 PROCESS_HEAP_ENTRY phe;
5294 phe.lpData = NULL;
5295 memset(saved_heap_entries, 0, sizeof(saved_heap_entries));
5296 saved_heap_entry_index = 0;
5297 int count = 0;
5298
5299 while (HeapWalk(heap, &phe) != 0) {
5300 count ++;
5301 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5302 !HeapValidate(heap, 0, phe.lpData)) {
5303 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5304 tty->print_cr("corrupted block near address %#x, length %d, count %d", phe.lpData, phe.cbData, count);
5305 HeapUnlock(heap);
5306 fatal("corrupted C heap");
5307 } else {
5308 // Save previous seen entries in a ring buffer. We have seen strange
5309 // heap corruption fatal errors that produced mdmp files, but when we load
5310 // these mdmp files in WinDBG, "!heap -triage" shows no error.
5311 // We can examine the saved_heap_entries[] array in the mdmp file to
5312 // diagnose such seemingly spurious errors reported by HeapWalk.
5313 saved_heap_entries[saved_heap_entry_index++] = phe;
5314 if (saved_heap_entry_index >= SAVE_COUNT) {
5315 saved_heap_entry_index = 0;
5316 }
5317 }
5318 }
5319 DWORD err = GetLastError();
5320 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED &&
5321 (err == ERROR_INVALID_FUNCTION && phe.lpData != NULL)) {
5322 HeapUnlock(heap);
5323 fatal("heap walk aborted with error %d", err);
5324 }
5325 HeapUnlock(heap);
5326 }
5327 mallocDebugIntervalCounter = 0;
5328 }
5329 return true;
5330 }
5331
5332
5333 bool os::find(address addr, outputStream* st) {
5334 int offset = -1;
5335 bool result = false;
5336 char buf[256];
5337 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5338 st->print(PTR_FORMAT " ", addr);
5339 if (strlen(buf) < sizeof(buf) - 1) {
5340 char* p = strrchr(buf, '\\');
5341 if (p) {
5342 st->print("%s", p + 1);
5343 } else {
5344 st->print("%s", buf);
5345 }
5346 } else {
5347 // The library name is probably truncated. Let's omit the library name.
5348 // See also JDK-8147512.
5349 }
5350 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5351 st->print("::%s + 0x%x", buf, offset);
5352 }
5353 st->cr();
5354 result = true;
5355 }
5356 return result;
5357 }
5358
5359 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5360 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5361
5362 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5363 JavaThread* thread = JavaThread::current();
5364 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5365 address addr = (address) exceptionRecord->ExceptionInformation[1];
5366
5367 if (os::is_memory_serialize_page(thread, addr)) {
5368 return EXCEPTION_CONTINUE_EXECUTION;
5369 }
5370 }
5371
5372 return EXCEPTION_CONTINUE_SEARCH;
5373 }
5374
5375 // We don't build a headless jre for Windows
5376 bool os::is_headless_jre() { return false; }
5377
5378 static jint initSock() {
5379 WSADATA wsadata;
5380
5381 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5382 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5383 ::GetLastError());
5384 return JNI_ERR;
5385 }
5386 return JNI_OK;
5387 }
5388
5389 struct hostent* os::get_host_by_name(char* name) {
5390 return (struct hostent*)gethostbyname(name);
5391 }
5392
5393 int os::socket_close(int fd) {
5394 return ::closesocket(fd);
5395 }
5396
5397 int os::socket(int domain, int type, int protocol) {
5398 return ::socket(domain, type, protocol);
5399 }
5400
5401 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5402 return ::connect(fd, him, len);
5403 }
5404
5405 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5406 return ::recv(fd, buf, (int)nBytes, flags);
5407 }
5408
5409 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5410 return ::send(fd, buf, (int)nBytes, flags);
5411 }
5412
5413 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5414 return ::send(fd, buf, (int)nBytes, flags);
5415 }
5416
5417 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5418 #if defined(IA32)
5419 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5420 #elif defined (AMD64)
5421 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5422 #endif
5423
5424 // returns true if thread could be suspended,
5425 // false otherwise
5426 static bool do_suspend(HANDLE* h) {
5427 if (h != NULL) {
5428 if (SuspendThread(*h) != ~0) {
5429 return true;
5430 }
5431 }
5432 return false;
5433 }
5434
5435 // resume the thread
5436 // calling resume on an active thread is a no-op
5437 static void do_resume(HANDLE* h) {
5438 if (h != NULL) {
5439 ResumeThread(*h);
5440 }
5441 }
5442
5443 // retrieve a suspend/resume context capable handle
5444 // from the tid. Caller validates handle return value.
5445 void get_thread_handle_for_extended_context(HANDLE* h,
5446 OSThread::thread_id_t tid) {
5447 if (h != NULL) {
5448 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5449 }
5450 }
5451
5452 // Thread sampling implementation
5453 //
5454 void os::SuspendedThreadTask::internal_do_task() {
5455 CONTEXT ctxt;
5456 HANDLE h = NULL;
5457
5458 // get context capable handle for thread
5459 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5460
5461 // sanity
5462 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5463 return;
5464 }
5465
5466 // suspend the thread
5467 if (do_suspend(&h)) {
5468 ctxt.ContextFlags = sampling_context_flags;
5469 // get thread context
5470 GetThreadContext(h, &ctxt);
5471 SuspendedThreadTaskContext context(_thread, &ctxt);
5472 // pass context to Thread Sampling impl
5473 do_task(context);
5474 // resume thread
5475 do_resume(&h);
5476 }
5477
5478 // close handle
5479 CloseHandle(h);
5480 }
5481
5482 bool os::start_debugging(char *buf, int buflen) {
5483 int len = (int)strlen(buf);
5484 char *p = &buf[len];
5485
5486 jio_snprintf(p, buflen-len,
5487 "\n\n"
5488 "Do you want to debug the problem?\n\n"
5489 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5490 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5491 "Otherwise, select 'No' to abort...",
5492 os::current_process_id(), os::current_thread_id());
5493
5494 bool yes = os::message_box("Unexpected Error", buf);
5495
5496 if (yes) {
5497 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5498 // exception. If VM is running inside a debugger, the debugger will
5499 // catch the exception. Otherwise, the breakpoint exception will reach
5500 // the default windows exception handler, which can spawn a debugger and
5501 // automatically attach to the dying VM.
5502 os::breakpoint();
5503 yes = false;
5504 }
5505 return yes;
5506 }
5507
5508 void* os::get_default_process_handle() {
5509 return (void*)GetModuleHandle(NULL);
5510 }
5511
5512 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5513 // which is used to find statically linked in agents.
5514 // Additionally for windows, takes into account __stdcall names.
5515 // Parameters:
5516 // sym_name: Symbol in library we are looking for
5517 // lib_name: Name of library to look in, NULL for shared libs.
5518 // is_absolute_path == true if lib_name is absolute path to agent
5519 // such as "C:/a/b/L.dll"
5520 // == false if only the base name of the library is passed in
5521 // such as "L"
5522 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5523 bool is_absolute_path) {
5524 char *agent_entry_name;
5525 size_t len;
5526 size_t name_len;
5527 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5528 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5529 const char *start;
5530
5531 if (lib_name != NULL) {
5532 len = name_len = strlen(lib_name);
5533 if (is_absolute_path) {
5534 // Need to strip path, prefix and suffix
5535 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5536 lib_name = ++start;
5537 } else {
5538 // Need to check for drive prefix
5539 if ((start = strchr(lib_name, ':')) != NULL) {
5540 lib_name = ++start;
5541 }
5542 }
5543 if (len <= (prefix_len + suffix_len)) {
5544 return NULL;
5545 }
5546 lib_name += prefix_len;
5547 name_len = strlen(lib_name) - suffix_len;
5548 }
5549 }
5550 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5551 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5552 if (agent_entry_name == NULL) {
5553 return NULL;
5554 }
5555 if (lib_name != NULL) {
5556 const char *p = strrchr(sym_name, '@');
5557 if (p != NULL && p != sym_name) {
5558 // sym_name == _Agent_OnLoad@XX
5559 strncpy(agent_entry_name, sym_name, (p - sym_name));
5560 agent_entry_name[(p-sym_name)] = '\0';
5561 // agent_entry_name == _Agent_OnLoad
5562 strcat(agent_entry_name, "_");
5563 strncat(agent_entry_name, lib_name, name_len);
5564 strcat(agent_entry_name, p);
5565 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5566 } else {
5567 strcpy(agent_entry_name, sym_name);
5568 strcat(agent_entry_name, "_");
5569 strncat(agent_entry_name, lib_name, name_len);
5570 }
5571 } else {
5572 strcpy(agent_entry_name, sym_name);
5573 }
5574 return agent_entry_name;
5575 }
5576
5577 #ifndef PRODUCT
5578
5579 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5580 // contiguous memory block at a particular address.
5581 // The test first tries to find a good approximate address to allocate at by using the same
5582 // method to allocate some memory at any address. The test then tries to allocate memory in
5583 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5584 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5585 // the previously allocated memory is available for allocation. The only actual failure
5586 // that is reported is when the test tries to allocate at a particular location but gets a
5587 // different valid one. A NULL return value at this point is not considered an error but may
5588 // be legitimate.
5589 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5590 void TestReserveMemorySpecial_test() {
5591 if (!UseLargePages) {
5592 if (VerboseInternalVMTests) {
5593 tty->print("Skipping test because large pages are disabled");
5594 }
5595 return;
5596 }
5597 // save current value of globals
5598 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5599 bool old_use_numa_interleaving = UseNUMAInterleaving;
5600
5601 // set globals to make sure we hit the correct code path
5602 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5603
5604 // do an allocation at an address selected by the OS to get a good one.
5605 const size_t large_allocation_size = os::large_page_size() * 4;
5606 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5607 if (result == NULL) {
5608 if (VerboseInternalVMTests) {
5609 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5610 large_allocation_size);
5611 }
5612 } else {
5613 os::release_memory_special(result, large_allocation_size);
5614
5615 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5616 // we managed to get it once.
5617 const size_t expected_allocation_size = os::large_page_size();
5618 char* expected_location = result + os::large_page_size();
5619 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5620 if (actual_location == NULL) {
5621 if (VerboseInternalVMTests) {
5622 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5623 expected_location, large_allocation_size);
5624 }
5625 } else {
5626 // release memory
5627 os::release_memory_special(actual_location, expected_allocation_size);
5628 // only now check, after releasing any memory to avoid any leaks.
5629 assert(actual_location == expected_location,
5630 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5631 expected_location, expected_allocation_size, actual_location);
5632 }
5633 }
5634
5635 // restore globals
5636 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5637 UseNUMAInterleaving = old_use_numa_interleaving;
5638 }
5639 #endif // PRODUCT
5640
5641 /*
5642 All the defined signal names for Windows.
5643
5644 NOTE that not all of these names are accepted by FindSignal!
5645
5646 For various reasons some of these may be rejected at runtime.
5647
5648 Here are the names currently accepted by a user of sun.misc.Signal with
5649 1.4.1 (ignoring potential interaction with use of chaining, etc):
5650
5651 (LIST TBD)
5652
5653 */
5654 int os::get_signal_number(const char* name) {
5655 static const struct {
5656 char* name;
5657 int number;
5658 } siglabels [] =
5659 // derived from version 6.0 VC98/include/signal.h
5660 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5661 "FPE", SIGFPE, // floating point exception
5662 "SEGV", SIGSEGV, // segment violation
5663 "INT", SIGINT, // interrupt
5664 "TERM", SIGTERM, // software term signal from kill
5665 "BREAK", SIGBREAK, // Ctrl-Break sequence
5666 "ILL", SIGILL}; // illegal instruction
5667 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5668 if (strcmp(name, siglabels[i].name) == 0) {
5669 return siglabels[i].number;
5670 }
5671 }
5672 return -1;
5673 }
5674
5675 // Fast current thread access
5676
5677 int os::win32::_thread_ptr_offset = 0;
5678
5679 static void call_wrapper_dummy() {}
5680
5681 // We need to call the os_exception_wrapper once so that it sets
5682 // up the offset from FS of the thread pointer.
5683 void os::win32::initialize_thread_ptr_offset() {
5684 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5685 NULL, NULL, NULL, NULL);
5686 }