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