1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "logging/log.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "mutex_windows.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm.h"
47 #include "prims/jvm_misc.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/atomic.inline.hpp"
50 #include "runtime/extendedPC.hpp"
51 #include "runtime/globals.hpp"
52 #include "runtime/interfaceSupport.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/mutexLocker.hpp"
56 #include "runtime/objectMonitor.hpp"
57 #include "runtime/orderAccess.inline.hpp"
58 #include "runtime/osThread.hpp"
59 #include "runtime/perfMemory.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/statSampler.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/thread.inline.hpp"
64 #include "runtime/threadCritical.hpp"
65 #include "runtime/timer.hpp"
66 #include "runtime/vm_version.hpp"
67 #include "semaphore_windows.hpp"
68 #include "services/attachListener.hpp"
69 #include "services/memTracker.hpp"
70 #include "services/runtimeService.hpp"
71 #include "utilities/decoder.hpp"
72 #include "utilities/defaultStream.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/growableArray.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/vmError.hpp"
77
78 #ifdef _DEBUG
79 #include <crtdbg.h>
80 #endif
81
82
83 #include <windows.h>
84 #include <sys/types.h>
85 #include <sys/stat.h>
86 #include <sys/timeb.h>
87 #include <objidl.h>
88 #include <shlobj.h>
89
90 #include <malloc.h>
91 #include <signal.h>
92 #include <direct.h>
93 #include <errno.h>
94 #include <fcntl.h>
95 #include <io.h>
96 #include <process.h> // For _beginthreadex(), _endthreadex()
97 #include <imagehlp.h> // For os::dll_address_to_function_name
98 // for enumerating dll libraries
99 #include <vdmdbg.h>
100
101 // for timer info max values which include all bits
102 #define ALL_64_BITS CONST64(-1)
103
104 // For DLL loading/load error detection
105 // Values of PE COFF
106 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
107 #define IMAGE_FILE_SIGNATURE_LENGTH 4
108
109 static HANDLE main_process;
110 static HANDLE main_thread;
111 static int main_thread_id;
112
113 static FILETIME process_creation_time;
114 static FILETIME process_exit_time;
115 static FILETIME process_user_time;
116 static FILETIME process_kernel_time;
117
118 #ifdef _M_IA64
119 #define __CPU__ ia64
120 #else
121 #ifdef _M_AMD64
122 #define __CPU__ amd64
123 #else
124 #define __CPU__ i486
125 #endif
126 #endif
127
128 // save DLL module handle, used by GetModuleFileName
129
130 HINSTANCE vm_lib_handle;
131
132 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
133 switch (reason) {
134 case DLL_PROCESS_ATTACH:
135 vm_lib_handle = hinst;
136 if (ForceTimeHighResolution) {
137 timeBeginPeriod(1L);
138 }
139 break;
140 case DLL_PROCESS_DETACH:
141 if (ForceTimeHighResolution) {
142 timeEndPeriod(1L);
143 }
144 break;
145 default:
146 break;
147 }
148 return true;
149 }
150
151 static inline double fileTimeAsDouble(FILETIME* time) {
152 const double high = (double) ((unsigned int) ~0);
153 const double split = 10000000.0;
154 double result = (time->dwLowDateTime / split) +
155 time->dwHighDateTime * (high/split);
156 return result;
157 }
158
159 // Implementation of os
160
161 bool os::unsetenv(const char* name) {
162 assert(name != NULL, "Null pointer");
163 return (SetEnvironmentVariable(name, NULL) == TRUE);
164 }
165
166 // No setuid programs under Windows.
167 bool os::have_special_privileges() {
168 return false;
169 }
170
171
172 // This method is a periodic task to check for misbehaving JNI applications
173 // under CheckJNI, we can add any periodic checks here.
174 // For Windows at the moment does nothing
175 void os::run_periodic_checks() {
176 return;
177 }
178
179 // previous UnhandledExceptionFilter, if there is one
180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
181
182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
183
184 void os::init_system_properties_values() {
185 // sysclasspath, java_home, dll_dir
186 {
187 char *home_path;
188 char *dll_path;
189 char *pslash;
190 char *bin = "\\bin";
191 char home_dir[MAX_PATH + 1];
192 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
193
194 if (alt_home_dir != NULL) {
195 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
196 home_dir[MAX_PATH] = '\0';
197 } else {
198 os::jvm_path(home_dir, sizeof(home_dir));
199 // Found the full path to jvm.dll.
200 // Now cut the path to <java_home>/jre if we can.
201 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
202 pslash = strrchr(home_dir, '\\');
203 if (pslash != NULL) {
204 *pslash = '\0'; // get rid of \{client|server}
205 pslash = strrchr(home_dir, '\\');
206 if (pslash != NULL) {
207 *pslash = '\0'; // get rid of \bin
208 }
209 }
210 }
211
212 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
213 if (home_path == NULL) {
214 return;
215 }
216 strcpy(home_path, home_dir);
217 Arguments::set_java_home(home_path);
218 FREE_C_HEAP_ARRAY(char, home_path);
219
220 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
221 mtInternal);
222 if (dll_path == NULL) {
223 return;
224 }
225 strcpy(dll_path, home_dir);
226 strcat(dll_path, bin);
227 Arguments::set_dll_dir(dll_path);
228 FREE_C_HEAP_ARRAY(char, dll_path);
229
230 if (!set_boot_path('\\', ';')) {
231 return;
232 }
233 }
234
235 // library_path
236 #define EXT_DIR "\\lib\\ext"
237 #define BIN_DIR "\\bin"
238 #define PACKAGE_DIR "\\Sun\\Java"
239 {
240 // Win32 library search order (See the documentation for LoadLibrary):
241 //
242 // 1. The directory from which application is loaded.
243 // 2. The system wide Java Extensions directory (Java only)
244 // 3. System directory (GetSystemDirectory)
245 // 4. Windows directory (GetWindowsDirectory)
246 // 5. The PATH environment variable
247 // 6. The current directory
248
249 char *library_path;
250 char tmp[MAX_PATH];
251 char *path_str = ::getenv("PATH");
252
253 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
254 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
255
256 library_path[0] = '\0';
257
258 GetModuleFileName(NULL, tmp, sizeof(tmp));
259 *(strrchr(tmp, '\\')) = '\0';
260 strcat(library_path, tmp);
261
262 GetWindowsDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265 strcat(library_path, PACKAGE_DIR BIN_DIR);
266
267 GetSystemDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
270
271 GetWindowsDirectory(tmp, sizeof(tmp));
272 strcat(library_path, ";");
273 strcat(library_path, tmp);
274
275 if (path_str) {
276 strcat(library_path, ";");
277 strcat(library_path, path_str);
278 }
279
280 strcat(library_path, ";.");
281
282 Arguments::set_library_path(library_path);
283 FREE_C_HEAP_ARRAY(char, library_path);
284 }
285
286 // Default extensions directory
287 {
288 char path[MAX_PATH];
289 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
290 GetWindowsDirectory(path, MAX_PATH);
291 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
292 path, PACKAGE_DIR, EXT_DIR);
293 Arguments::set_ext_dirs(buf);
294 }
295 #undef EXT_DIR
296 #undef BIN_DIR
297 #undef PACKAGE_DIR
298
299 #ifndef _WIN64
300 // set our UnhandledExceptionFilter and save any previous one
301 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
302 #endif
303
304 // Done
305 return;
306 }
307
308 void os::breakpoint() {
309 DebugBreak();
310 }
311
312 // Invoked from the BREAKPOINT Macro
313 extern "C" void breakpoint() {
314 os::breakpoint();
315 }
316
317 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
318 // So far, this method is only used by Native Memory Tracking, which is
319 // only supported on Windows XP or later.
320 //
321 int os::get_native_stack(address* stack, int frames, int toSkip) {
322 #ifdef _NMT_NOINLINE_
323 toSkip++;
324 #endif
325 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
326 for (int index = captured; index < frames; index ++) {
327 stack[index] = NULL;
328 }
329 return captured;
330 }
331
332
333 // os::current_stack_base()
334 //
335 // Returns the base of the stack, which is the stack's
336 // starting address. This function must be called
337 // while running on the stack of the thread being queried.
338
339 address os::current_stack_base() {
340 MEMORY_BASIC_INFORMATION minfo;
341 address stack_bottom;
342 size_t stack_size;
343
344 VirtualQuery(&minfo, &minfo, sizeof(minfo));
345 stack_bottom = (address)minfo.AllocationBase;
346 stack_size = minfo.RegionSize;
347
348 // Add up the sizes of all the regions with the same
349 // AllocationBase.
350 while (1) {
351 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
352 if (stack_bottom == (address)minfo.AllocationBase) {
353 stack_size += minfo.RegionSize;
354 } else {
355 break;
356 }
357 }
358
359 #ifdef _M_IA64
360 // IA64 has memory and register stacks
361 //
362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
363 // at thread creation (1MB backing store growing upwards, 1MB memory stack
364 // growing downwards, 2MB summed up)
365 //
366 // ...
367 // ------- top of stack (high address) -----
368 // |
369 // | 1MB
370 // | Backing Store (Register Stack)
371 // |
372 // | / \
373 // | |
374 // | |
375 // | |
376 // ------------------------ stack base -----
377 // | 1MB
378 // | Memory Stack
379 // |
380 // | |
381 // | |
382 // | |
383 // | \ /
384 // |
385 // ----- bottom of stack (low address) -----
386 // ...
387
388 stack_size = stack_size / 2;
389 #endif
390 return stack_bottom + stack_size;
391 }
392
393 size_t os::current_stack_size() {
394 size_t sz;
395 MEMORY_BASIC_INFORMATION minfo;
396 VirtualQuery(&minfo, &minfo, sizeof(minfo));
397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
398 return sz;
399 }
400
401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
402 const struct tm* time_struct_ptr = localtime(clock);
403 if (time_struct_ptr != NULL) {
404 *res = *time_struct_ptr;
405 return res;
406 }
407 return NULL;
408 }
409
410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
411
412 // Thread start routine for all newly created threads
413 static unsigned __stdcall thread_native_entry(Thread* thread) {
414 // Try to randomize the cache line index of hot stack frames.
415 // This helps when threads of the same stack traces evict each other's
416 // cache lines. The threads can be either from the same JVM instance, or
417 // from different JVM instances. The benefit is especially true for
418 // processors with hyperthreading technology.
419 static int counter = 0;
420 int pid = os::current_process_id();
421 _alloca(((pid ^ counter++) & 7) * 128);
422
423 thread->initialize_thread_current();
424
425 OSThread* osthr = thread->osthread();
426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
427
428 if (UseNUMA) {
429 int lgrp_id = os::numa_get_group_id();
430 if (lgrp_id != -1) {
431 thread->set_lgrp_id(lgrp_id);
432 }
433 }
434
435 // Diagnostic code to investigate JDK-6573254
436 int res = 30115; // non-java thread
437 if (thread->is_Java_thread()) {
438 res = 20115; // java thread
439 }
440
441 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
442
443 // Install a win32 structured exception handler around every thread created
444 // by VM, so VM can generate error dump when an exception occurred in non-
445 // Java thread (e.g. VM thread).
446 __try {
447 thread->run();
448 } __except(topLevelExceptionFilter(
449 (_EXCEPTION_POINTERS*)_exception_info())) {
450 // Nothing to do.
451 }
452
453 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
454
455 // One less thread is executing
456 // When the VMThread gets here, the main thread may have already exited
457 // which frees the CodeHeap containing the Atomic::add code
458 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
459 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
460 }
461
462 // If a thread has not deleted itself ("delete this") as part of its
463 // termination sequence, we have to ensure thread-local-storage is
464 // cleared before we actually terminate. No threads should ever be
465 // deleted asynchronously with respect to their termination.
466 if (Thread::current_or_null_safe() != NULL) {
467 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
468 thread->clear_thread_current();
469 }
470
471 // Thread must not return from exit_process_or_thread(), but if it does,
472 // let it proceed to exit normally
473 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
474 }
475
476 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
477 int thread_id) {
478 // Allocate the OSThread object
479 OSThread* osthread = new OSThread(NULL, NULL);
480 if (osthread == NULL) return NULL;
481
482 // Initialize support for Java interrupts
483 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
484 if (interrupt_event == NULL) {
485 delete osthread;
486 return NULL;
487 }
488 osthread->set_interrupt_event(interrupt_event);
489
490 // Store info on the Win32 thread into the OSThread
491 osthread->set_thread_handle(thread_handle);
492 osthread->set_thread_id(thread_id);
493
494 if (UseNUMA) {
495 int lgrp_id = os::numa_get_group_id();
496 if (lgrp_id != -1) {
497 thread->set_lgrp_id(lgrp_id);
498 }
499 }
500
501 // Initial thread state is INITIALIZED, not SUSPENDED
502 osthread->set_state(INITIALIZED);
503
504 return osthread;
505 }
506
507
508 bool os::create_attached_thread(JavaThread* thread) {
509 #ifdef ASSERT
510 thread->verify_not_published();
511 #endif
512 HANDLE thread_h;
513 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
514 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
515 fatal("DuplicateHandle failed\n");
516 }
517 OSThread* osthread = create_os_thread(thread, thread_h,
518 (int)current_thread_id());
519 if (osthread == NULL) {
520 return false;
521 }
522
523 // Initial thread state is RUNNABLE
524 osthread->set_state(RUNNABLE);
525
526 thread->set_osthread(osthread);
527
528 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
529 os::current_thread_id());
530
531 return true;
532 }
533
534 bool os::create_main_thread(JavaThread* thread) {
535 #ifdef ASSERT
536 thread->verify_not_published();
537 #endif
538 if (_starting_thread == NULL) {
539 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
540 if (_starting_thread == NULL) {
541 return false;
542 }
543 }
544
545 // The primordial thread is runnable from the start)
546 _starting_thread->set_state(RUNNABLE);
547
548 thread->set_osthread(_starting_thread);
549 return true;
550 }
551
552 // Helper function to trace _beginthreadex attributes,
553 // similar to os::Posix::describe_pthread_attr()
554 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
555 size_t stacksize, unsigned initflag) {
556 stringStream ss(buf, buflen);
557 if (stacksize == 0) {
558 ss.print("stacksize: default, ");
559 } else {
560 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
561 }
562 ss.print("flags: ");
563 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
564 #define ALL(X) \
565 X(CREATE_SUSPENDED) \
566 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
567 ALL(PRINT_FLAG)
568 #undef ALL
569 #undef PRINT_FLAG
570 return buf;
571 }
572
573 // Allocate and initialize a new OSThread
574 bool os::create_thread(Thread* thread, ThreadType thr_type,
575 size_t stack_size) {
576 unsigned thread_id;
577
578 // Allocate the OSThread object
579 OSThread* osthread = new OSThread(NULL, NULL);
580 if (osthread == NULL) {
581 return false;
582 }
583
584 // Initialize support for Java interrupts
585 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
586 if (interrupt_event == NULL) {
587 delete osthread;
588 return NULL;
589 }
590 osthread->set_interrupt_event(interrupt_event);
591 osthread->set_interrupted(false);
592
593 thread->set_osthread(osthread);
594
595 if (stack_size == 0) {
596 switch (thr_type) {
597 case os::java_thread:
598 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
599 if (JavaThread::stack_size_at_create() > 0) {
600 stack_size = JavaThread::stack_size_at_create();
601 }
602 break;
603 case os::compiler_thread:
604 if (CompilerThreadStackSize > 0) {
605 stack_size = (size_t)(CompilerThreadStackSize * K);
606 break;
607 } // else fall through:
608 // use VMThreadStackSize if CompilerThreadStackSize is not defined
609 case os::vm_thread:
610 case os::pgc_thread:
611 case os::cgc_thread:
612 case os::watcher_thread:
613 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
614 break;
615 }
616 }
617
618 // Create the Win32 thread
619 //
620 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
621 // does not specify stack size. Instead, it specifies the size of
622 // initially committed space. The stack size is determined by
623 // PE header in the executable. If the committed "stack_size" is larger
624 // than default value in the PE header, the stack is rounded up to the
625 // nearest multiple of 1MB. For example if the launcher has default
626 // stack size of 320k, specifying any size less than 320k does not
627 // affect the actual stack size at all, it only affects the initial
628 // commitment. On the other hand, specifying 'stack_size' larger than
629 // default value may cause significant increase in memory usage, because
630 // not only the stack space will be rounded up to MB, but also the
631 // entire space is committed upfront.
632 //
633 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
634 // for CreateThread() that can treat 'stack_size' as stack size. However we
635 // are not supposed to call CreateThread() directly according to MSDN
636 // document because JVM uses C runtime library. The good news is that the
637 // flag appears to work with _beginthredex() as well.
638
639 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
640 HANDLE thread_handle =
641 (HANDLE)_beginthreadex(NULL,
642 (unsigned)stack_size,
643 (unsigned (__stdcall *)(void*)) thread_native_entry,
644 thread,
645 initflag,
646 &thread_id);
647
648 char buf[64];
649 if (thread_handle != NULL) {
650 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
651 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
652 } else {
653 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
654 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
655 }
656
657 if (thread_handle == NULL) {
658 // Need to clean up stuff we've allocated so far
659 CloseHandle(osthread->interrupt_event());
660 thread->set_osthread(NULL);
661 delete osthread;
662 return NULL;
663 }
664
665 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
666
667 // Store info on the Win32 thread into the OSThread
668 osthread->set_thread_handle(thread_handle);
669 osthread->set_thread_id(thread_id);
670
671 // Initial thread state is INITIALIZED, not SUSPENDED
672 osthread->set_state(INITIALIZED);
673
674 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
675 return true;
676 }
677
678
679 // Free Win32 resources related to the OSThread
680 void os::free_thread(OSThread* osthread) {
681 assert(osthread != NULL, "osthread not set");
682
683 // We are told to free resources of the argument thread,
684 // but we can only really operate on the current thread.
685 assert(Thread::current()->osthread() == osthread,
686 "os::free_thread but not current thread");
687
688 CloseHandle(osthread->thread_handle());
689 CloseHandle(osthread->interrupt_event());
690 delete osthread;
691 }
692
693 static jlong first_filetime;
694 static jlong initial_performance_count;
695 static jlong performance_frequency;
696
697
698 jlong as_long(LARGE_INTEGER x) {
699 jlong result = 0; // initialization to avoid warning
700 set_high(&result, x.HighPart);
701 set_low(&result, x.LowPart);
702 return result;
703 }
704
705
706 jlong os::elapsed_counter() {
707 LARGE_INTEGER count;
708 QueryPerformanceCounter(&count);
709 return as_long(count) - initial_performance_count;
710 }
711
712
713 jlong os::elapsed_frequency() {
714 return performance_frequency;
715 }
716
717
718 julong os::available_memory() {
719 return win32::available_memory();
720 }
721
722 julong os::win32::available_memory() {
723 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
724 // value if total memory is larger than 4GB
725 MEMORYSTATUSEX ms;
726 ms.dwLength = sizeof(ms);
727 GlobalMemoryStatusEx(&ms);
728
729 return (julong)ms.ullAvailPhys;
730 }
731
732 julong os::physical_memory() {
733 return win32::physical_memory();
734 }
735
736 bool os::has_allocatable_memory_limit(julong* limit) {
737 MEMORYSTATUSEX ms;
738 ms.dwLength = sizeof(ms);
739 GlobalMemoryStatusEx(&ms);
740 #ifdef _LP64
741 *limit = (julong)ms.ullAvailVirtual;
742 return true;
743 #else
744 // Limit to 1400m because of the 2gb address space wall
745 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
746 return true;
747 #endif
748 }
749
750 int os::active_processor_count() {
751 DWORD_PTR lpProcessAffinityMask = 0;
752 DWORD_PTR lpSystemAffinityMask = 0;
753 int proc_count = processor_count();
754 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
755 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
756 // Nof active processors is number of bits in process affinity mask
757 int bitcount = 0;
758 while (lpProcessAffinityMask != 0) {
759 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
760 bitcount++;
761 }
762 return bitcount;
763 } else {
764 return proc_count;
765 }
766 }
767
768 void os::set_native_thread_name(const char *name) {
769
770 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
771 //
772 // Note that unfortunately this only works if the process
773 // is already attached to a debugger; debugger must observe
774 // the exception below to show the correct name.
775
776 const DWORD MS_VC_EXCEPTION = 0x406D1388;
777 struct {
778 DWORD dwType; // must be 0x1000
779 LPCSTR szName; // pointer to name (in user addr space)
780 DWORD dwThreadID; // thread ID (-1=caller thread)
781 DWORD dwFlags; // reserved for future use, must be zero
782 } info;
783
784 info.dwType = 0x1000;
785 info.szName = name;
786 info.dwThreadID = -1;
787 info.dwFlags = 0;
788
789 __try {
790 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
791 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
792 }
793
794 bool os::distribute_processes(uint length, uint* distribution) {
795 // Not yet implemented.
796 return false;
797 }
798
799 bool os::bind_to_processor(uint processor_id) {
800 // Not yet implemented.
801 return false;
802 }
803
804 void os::win32::initialize_performance_counter() {
805 LARGE_INTEGER count;
806 QueryPerformanceFrequency(&count);
807 performance_frequency = as_long(count);
808 QueryPerformanceCounter(&count);
809 initial_performance_count = as_long(count);
810 }
811
812
813 double os::elapsedTime() {
814 return (double) elapsed_counter() / (double) elapsed_frequency();
815 }
816
817
818 // Windows format:
819 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
820 // Java format:
821 // Java standards require the number of milliseconds since 1/1/1970
822
823 // Constant offset - calculated using offset()
824 static jlong _offset = 116444736000000000;
825 // Fake time counter for reproducible results when debugging
826 static jlong fake_time = 0;
827
828 #ifdef ASSERT
829 // Just to be safe, recalculate the offset in debug mode
830 static jlong _calculated_offset = 0;
831 static int _has_calculated_offset = 0;
832
833 jlong offset() {
834 if (_has_calculated_offset) return _calculated_offset;
835 SYSTEMTIME java_origin;
836 java_origin.wYear = 1970;
837 java_origin.wMonth = 1;
838 java_origin.wDayOfWeek = 0; // ignored
839 java_origin.wDay = 1;
840 java_origin.wHour = 0;
841 java_origin.wMinute = 0;
842 java_origin.wSecond = 0;
843 java_origin.wMilliseconds = 0;
844 FILETIME jot;
845 if (!SystemTimeToFileTime(&java_origin, &jot)) {
846 fatal("Error = %d\nWindows error", GetLastError());
847 }
848 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
849 _has_calculated_offset = 1;
850 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
851 return _calculated_offset;
852 }
853 #else
854 jlong offset() {
855 return _offset;
856 }
857 #endif
858
859 jlong windows_to_java_time(FILETIME wt) {
860 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
861 return (a - offset()) / 10000;
862 }
863
864 // Returns time ticks in (10th of micro seconds)
865 jlong windows_to_time_ticks(FILETIME wt) {
866 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
867 return (a - offset());
868 }
869
870 FILETIME java_to_windows_time(jlong l) {
871 jlong a = (l * 10000) + offset();
872 FILETIME result;
873 result.dwHighDateTime = high(a);
874 result.dwLowDateTime = low(a);
875 return result;
876 }
877
878 bool os::supports_vtime() { return true; }
879 bool os::enable_vtime() { return false; }
880 bool os::vtime_enabled() { return false; }
881
882 double os::elapsedVTime() {
883 FILETIME created;
884 FILETIME exited;
885 FILETIME kernel;
886 FILETIME user;
887 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
888 // the resolution of windows_to_java_time() should be sufficient (ms)
889 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
890 } else {
891 return elapsedTime();
892 }
893 }
894
895 jlong os::javaTimeMillis() {
896 if (UseFakeTimers) {
897 return fake_time++;
898 } else {
899 FILETIME wt;
900 GetSystemTimeAsFileTime(&wt);
901 return windows_to_java_time(wt);
902 }
903 }
904
905 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
906 FILETIME wt;
907 GetSystemTimeAsFileTime(&wt);
908 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
909 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
910 seconds = secs;
911 nanos = jlong(ticks - (secs*10000000)) * 100;
912 }
913
914 jlong os::javaTimeNanos() {
915 LARGE_INTEGER current_count;
916 QueryPerformanceCounter(¤t_count);
917 double current = as_long(current_count);
918 double freq = performance_frequency;
919 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
920 return time;
921 }
922
923 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
924 jlong freq = performance_frequency;
925 if (freq < NANOSECS_PER_SEC) {
926 // the performance counter is 64 bits and we will
927 // be multiplying it -- so no wrap in 64 bits
928 info_ptr->max_value = ALL_64_BITS;
929 } else if (freq > NANOSECS_PER_SEC) {
930 // use the max value the counter can reach to
931 // determine the max value which could be returned
932 julong max_counter = (julong)ALL_64_BITS;
933 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
934 } else {
935 // the performance counter is 64 bits and we will
936 // be using it directly -- so no wrap in 64 bits
937 info_ptr->max_value = ALL_64_BITS;
938 }
939
940 // using a counter, so no skipping
941 info_ptr->may_skip_backward = false;
942 info_ptr->may_skip_forward = false;
943
944 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
945 }
946
947 char* os::local_time_string(char *buf, size_t buflen) {
948 SYSTEMTIME st;
949 GetLocalTime(&st);
950 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
951 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
952 return buf;
953 }
954
955 bool os::getTimesSecs(double* process_real_time,
956 double* process_user_time,
957 double* process_system_time) {
958 HANDLE h_process = GetCurrentProcess();
959 FILETIME create_time, exit_time, kernel_time, user_time;
960 BOOL result = GetProcessTimes(h_process,
961 &create_time,
962 &exit_time,
963 &kernel_time,
964 &user_time);
965 if (result != 0) {
966 FILETIME wt;
967 GetSystemTimeAsFileTime(&wt);
968 jlong rtc_millis = windows_to_java_time(wt);
969 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
970 *process_user_time =
971 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
972 *process_system_time =
973 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
974 return true;
975 } else {
976 return false;
977 }
978 }
979
980 void os::shutdown() {
981 // allow PerfMemory to attempt cleanup of any persistent resources
982 perfMemory_exit();
983
984 // flush buffered output, finish log files
985 ostream_abort();
986
987 // Check for abort hook
988 abort_hook_t abort_hook = Arguments::abort_hook();
989 if (abort_hook != NULL) {
990 abort_hook();
991 }
992 }
993
994
995 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
996 PMINIDUMP_EXCEPTION_INFORMATION,
997 PMINIDUMP_USER_STREAM_INFORMATION,
998 PMINIDUMP_CALLBACK_INFORMATION);
999
1000 static HANDLE dumpFile = NULL;
1001
1002 // Check if dump file can be created.
1003 void os::check_dump_limit(char* buffer, size_t buffsz) {
1004 bool status = true;
1005 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1006 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1007 status = false;
1008 }
1009
1010 #ifndef ASSERT
1011 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1012 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1013 status = false;
1014 }
1015 #endif
1016
1017 if (status) {
1018 const char* cwd = get_current_directory(NULL, 0);
1019 int pid = current_process_id();
1020 if (cwd != NULL) {
1021 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1022 } else {
1023 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1024 }
1025
1026 if (dumpFile == NULL &&
1027 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1028 == INVALID_HANDLE_VALUE) {
1029 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1030 status = false;
1031 }
1032 }
1033 VMError::record_coredump_status(buffer, status);
1034 }
1035
1036 void os::abort(bool dump_core, void* siginfo, const void* context) {
1037 HINSTANCE dbghelp;
1038 EXCEPTION_POINTERS ep;
1039 MINIDUMP_EXCEPTION_INFORMATION mei;
1040 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1041
1042 HANDLE hProcess = GetCurrentProcess();
1043 DWORD processId = GetCurrentProcessId();
1044 MINIDUMP_TYPE dumpType;
1045
1046 shutdown();
1047 if (!dump_core || dumpFile == NULL) {
1048 if (dumpFile != NULL) {
1049 CloseHandle(dumpFile);
1050 }
1051 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1052 }
1053
1054 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1055
1056 if (dbghelp == NULL) {
1057 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1058 CloseHandle(dumpFile);
1059 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1060 }
1061
1062 _MiniDumpWriteDump =
1063 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1064 PMINIDUMP_EXCEPTION_INFORMATION,
1065 PMINIDUMP_USER_STREAM_INFORMATION,
1066 PMINIDUMP_CALLBACK_INFORMATION),
1067 GetProcAddress(dbghelp,
1068 "MiniDumpWriteDump"));
1069
1070 if (_MiniDumpWriteDump == NULL) {
1071 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1072 CloseHandle(dumpFile);
1073 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1074 }
1075
1076 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1077 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1078
1079 if (siginfo != NULL && context != NULL) {
1080 ep.ContextRecord = (PCONTEXT) context;
1081 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1082
1083 mei.ThreadId = GetCurrentThreadId();
1084 mei.ExceptionPointers = &ep;
1085 pmei = &mei;
1086 } else {
1087 pmei = NULL;
1088 }
1089
1090 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1091 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1092 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1093 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1094 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1095 }
1096 CloseHandle(dumpFile);
1097 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1098 }
1099
1100 // Die immediately, no exit hook, no abort hook, no cleanup.
1101 void os::die() {
1102 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1103 }
1104
1105 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1106 // * dirent_md.c 1.15 00/02/02
1107 //
1108 // The declarations for DIR and struct dirent are in jvm_win32.h.
1109
1110 // Caller must have already run dirname through JVM_NativePath, which removes
1111 // duplicate slashes and converts all instances of '/' into '\\'.
1112
1113 DIR * os::opendir(const char *dirname) {
1114 assert(dirname != NULL, "just checking"); // hotspot change
1115 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1116 DWORD fattr; // hotspot change
1117 char alt_dirname[4] = { 0, 0, 0, 0 };
1118
1119 if (dirp == 0) {
1120 errno = ENOMEM;
1121 return 0;
1122 }
1123
1124 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1125 // as a directory in FindFirstFile(). We detect this case here and
1126 // prepend the current drive name.
1127 //
1128 if (dirname[1] == '\0' && dirname[0] == '\\') {
1129 alt_dirname[0] = _getdrive() + 'A' - 1;
1130 alt_dirname[1] = ':';
1131 alt_dirname[2] = '\\';
1132 alt_dirname[3] = '\0';
1133 dirname = alt_dirname;
1134 }
1135
1136 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1137 if (dirp->path == 0) {
1138 free(dirp);
1139 errno = ENOMEM;
1140 return 0;
1141 }
1142 strcpy(dirp->path, dirname);
1143
1144 fattr = GetFileAttributes(dirp->path);
1145 if (fattr == 0xffffffff) {
1146 free(dirp->path);
1147 free(dirp);
1148 errno = ENOENT;
1149 return 0;
1150 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1151 free(dirp->path);
1152 free(dirp);
1153 errno = ENOTDIR;
1154 return 0;
1155 }
1156
1157 // Append "*.*", or possibly "\\*.*", to path
1158 if (dirp->path[1] == ':' &&
1159 (dirp->path[2] == '\0' ||
1160 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1161 // No '\\' needed for cases like "Z:" or "Z:\"
1162 strcat(dirp->path, "*.*");
1163 } else {
1164 strcat(dirp->path, "\\*.*");
1165 }
1166
1167 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1168 if (dirp->handle == INVALID_HANDLE_VALUE) {
1169 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1170 free(dirp->path);
1171 free(dirp);
1172 errno = EACCES;
1173 return 0;
1174 }
1175 }
1176 return dirp;
1177 }
1178
1179 // parameter dbuf unused on Windows
1180 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1181 assert(dirp != NULL, "just checking"); // hotspot change
1182 if (dirp->handle == INVALID_HANDLE_VALUE) {
1183 return 0;
1184 }
1185
1186 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1187
1188 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1189 if (GetLastError() == ERROR_INVALID_HANDLE) {
1190 errno = EBADF;
1191 return 0;
1192 }
1193 FindClose(dirp->handle);
1194 dirp->handle = INVALID_HANDLE_VALUE;
1195 }
1196
1197 return &dirp->dirent;
1198 }
1199
1200 int os::closedir(DIR *dirp) {
1201 assert(dirp != NULL, "just checking"); // hotspot change
1202 if (dirp->handle != INVALID_HANDLE_VALUE) {
1203 if (!FindClose(dirp->handle)) {
1204 errno = EBADF;
1205 return -1;
1206 }
1207 dirp->handle = INVALID_HANDLE_VALUE;
1208 }
1209 free(dirp->path);
1210 free(dirp);
1211 return 0;
1212 }
1213
1214 // This must be hard coded because it's the system's temporary
1215 // directory not the java application's temp directory, ala java.io.tmpdir.
1216 const char* os::get_temp_directory() {
1217 static char path_buf[MAX_PATH];
1218 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1219 return path_buf;
1220 } else {
1221 path_buf[0] = '\0';
1222 return path_buf;
1223 }
1224 }
1225
1226 static bool file_exists(const char* filename) {
1227 if (filename == NULL || strlen(filename) == 0) {
1228 return false;
1229 }
1230 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1231 }
1232
1233 bool os::dll_build_name(char *buffer, size_t buflen,
1234 const char* pname, const char* fname) {
1235 bool retval = false;
1236 const size_t pnamelen = pname ? strlen(pname) : 0;
1237 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1238
1239 // Return error on buffer overflow.
1240 if (pnamelen + strlen(fname) + 10 > buflen) {
1241 return retval;
1242 }
1243
1244 if (pnamelen == 0) {
1245 jio_snprintf(buffer, buflen, "%s.dll", fname);
1246 retval = true;
1247 } else if (c == ':' || c == '\\') {
1248 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1249 retval = true;
1250 } else if (strchr(pname, *os::path_separator()) != NULL) {
1251 int n;
1252 char** pelements = split_path(pname, &n);
1253 if (pelements == NULL) {
1254 return false;
1255 }
1256 for (int i = 0; i < n; i++) {
1257 char* path = pelements[i];
1258 // Really shouldn't be NULL, but check can't hurt
1259 size_t plen = (path == NULL) ? 0 : strlen(path);
1260 if (plen == 0) {
1261 continue; // skip the empty path values
1262 }
1263 const char lastchar = path[plen - 1];
1264 if (lastchar == ':' || lastchar == '\\') {
1265 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1266 } else {
1267 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1268 }
1269 if (file_exists(buffer)) {
1270 retval = true;
1271 break;
1272 }
1273 }
1274 // release the storage
1275 for (int i = 0; i < n; i++) {
1276 if (pelements[i] != NULL) {
1277 FREE_C_HEAP_ARRAY(char, pelements[i]);
1278 }
1279 }
1280 if (pelements != NULL) {
1281 FREE_C_HEAP_ARRAY(char*, pelements);
1282 }
1283 } else {
1284 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1285 retval = true;
1286 }
1287 return retval;
1288 }
1289
1290 // Needs to be in os specific directory because windows requires another
1291 // header file <direct.h>
1292 const char* os::get_current_directory(char *buf, size_t buflen) {
1293 int n = static_cast<int>(buflen);
1294 if (buflen > INT_MAX) n = INT_MAX;
1295 return _getcwd(buf, n);
1296 }
1297
1298 //-----------------------------------------------------------
1299 // Helper functions for fatal error handler
1300 #ifdef _WIN64
1301 // Helper routine which returns true if address in
1302 // within the NTDLL address space.
1303 //
1304 static bool _addr_in_ntdll(address addr) {
1305 HMODULE hmod;
1306 MODULEINFO minfo;
1307
1308 hmod = GetModuleHandle("NTDLL.DLL");
1309 if (hmod == NULL) return false;
1310 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1311 &minfo, sizeof(MODULEINFO))) {
1312 return false;
1313 }
1314
1315 if ((addr >= minfo.lpBaseOfDll) &&
1316 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1317 return true;
1318 } else {
1319 return false;
1320 }
1321 }
1322 #endif
1323
1324 struct _modinfo {
1325 address addr;
1326 char* full_path; // point to a char buffer
1327 int buflen; // size of the buffer
1328 address base_addr;
1329 };
1330
1331 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1332 address top_address, void * param) {
1333 struct _modinfo *pmod = (struct _modinfo *)param;
1334 if (!pmod) return -1;
1335
1336 if (base_addr <= pmod->addr &&
1337 top_address > pmod->addr) {
1338 // if a buffer is provided, copy path name to the buffer
1339 if (pmod->full_path) {
1340 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1341 }
1342 pmod->base_addr = base_addr;
1343 return 1;
1344 }
1345 return 0;
1346 }
1347
1348 bool os::dll_address_to_library_name(address addr, char* buf,
1349 int buflen, int* offset) {
1350 // buf is not optional, but offset is optional
1351 assert(buf != NULL, "sanity check");
1352
1353 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1354 // return the full path to the DLL file, sometimes it returns path
1355 // to the corresponding PDB file (debug info); sometimes it only
1356 // returns partial path, which makes life painful.
1357
1358 struct _modinfo mi;
1359 mi.addr = addr;
1360 mi.full_path = buf;
1361 mi.buflen = buflen;
1362 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1363 // buf already contains path name
1364 if (offset) *offset = addr - mi.base_addr;
1365 return true;
1366 }
1367
1368 buf[0] = '\0';
1369 if (offset) *offset = -1;
1370 return false;
1371 }
1372
1373 bool os::dll_address_to_function_name(address addr, char *buf,
1374 int buflen, int *offset,
1375 bool demangle) {
1376 // buf is not optional, but offset is optional
1377 assert(buf != NULL, "sanity check");
1378
1379 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1380 return true;
1381 }
1382 if (offset != NULL) *offset = -1;
1383 buf[0] = '\0';
1384 return false;
1385 }
1386
1387 // save the start and end address of jvm.dll into param[0] and param[1]
1388 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1389 address top_address, void * param) {
1390 if (!param) return -1;
1391
1392 if (base_addr <= (address)_locate_jvm_dll &&
1393 top_address > (address)_locate_jvm_dll) {
1394 ((address*)param)[0] = base_addr;
1395 ((address*)param)[1] = top_address;
1396 return 1;
1397 }
1398 return 0;
1399 }
1400
1401 address vm_lib_location[2]; // start and end address of jvm.dll
1402
1403 // check if addr is inside jvm.dll
1404 bool os::address_is_in_vm(address addr) {
1405 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1406 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1407 assert(false, "Can't find jvm module.");
1408 return false;
1409 }
1410 }
1411
1412 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1413 }
1414
1415 // print module info; param is outputStream*
1416 static int _print_module(const char* fname, address base_address,
1417 address top_address, void* param) {
1418 if (!param) return -1;
1419
1420 outputStream* st = (outputStream*)param;
1421
1422 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1423 return 0;
1424 }
1425
1426 // Loads .dll/.so and
1427 // in case of error it checks if .dll/.so was built for the
1428 // same architecture as Hotspot is running on
1429 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1430 void * result = LoadLibrary(name);
1431 if (result != NULL) {
1432 return result;
1433 }
1434
1435 DWORD errcode = GetLastError();
1436 if (errcode == ERROR_MOD_NOT_FOUND) {
1437 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1438 ebuf[ebuflen - 1] = '\0';
1439 return NULL;
1440 }
1441
1442 // Parsing dll below
1443 // If we can read dll-info and find that dll was built
1444 // for an architecture other than Hotspot is running in
1445 // - then print to buffer "DLL was built for a different architecture"
1446 // else call os::lasterror to obtain system error message
1447
1448 // Read system error message into ebuf
1449 // It may or may not be overwritten below (in the for loop and just above)
1450 lasterror(ebuf, (size_t) ebuflen);
1451 ebuf[ebuflen - 1] = '\0';
1452 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1453 if (fd < 0) {
1454 return NULL;
1455 }
1456
1457 uint32_t signature_offset;
1458 uint16_t lib_arch = 0;
1459 bool failed_to_get_lib_arch =
1460 ( // Go to position 3c in the dll
1461 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1462 ||
1463 // Read location of signature
1464 (sizeof(signature_offset) !=
1465 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1466 ||
1467 // Go to COFF File Header in dll
1468 // that is located after "signature" (4 bytes long)
1469 (os::seek_to_file_offset(fd,
1470 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1471 ||
1472 // Read field that contains code of architecture
1473 // that dll was built for
1474 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1475 );
1476
1477 ::close(fd);
1478 if (failed_to_get_lib_arch) {
1479 // file i/o error - report os::lasterror(...) msg
1480 return NULL;
1481 }
1482
1483 typedef struct {
1484 uint16_t arch_code;
1485 char* arch_name;
1486 } arch_t;
1487
1488 static const arch_t arch_array[] = {
1489 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1490 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1491 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1492 };
1493 #if (defined _M_IA64)
1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1495 #elif (defined _M_AMD64)
1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1497 #elif (defined _M_IX86)
1498 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1499 #else
1500 #error Method os::dll_load requires that one of following \
1501 is defined :_M_IA64,_M_AMD64 or _M_IX86
1502 #endif
1503
1504
1505 // Obtain a string for printf operation
1506 // lib_arch_str shall contain string what platform this .dll was built for
1507 // running_arch_str shall string contain what platform Hotspot was built for
1508 char *running_arch_str = NULL, *lib_arch_str = NULL;
1509 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1510 if (lib_arch == arch_array[i].arch_code) {
1511 lib_arch_str = arch_array[i].arch_name;
1512 }
1513 if (running_arch == arch_array[i].arch_code) {
1514 running_arch_str = arch_array[i].arch_name;
1515 }
1516 }
1517
1518 assert(running_arch_str,
1519 "Didn't find running architecture code in arch_array");
1520
1521 // If the architecture is right
1522 // but some other error took place - report os::lasterror(...) msg
1523 if (lib_arch == running_arch) {
1524 return NULL;
1525 }
1526
1527 if (lib_arch_str != NULL) {
1528 ::_snprintf(ebuf, ebuflen - 1,
1529 "Can't load %s-bit .dll on a %s-bit platform",
1530 lib_arch_str, running_arch_str);
1531 } else {
1532 // don't know what architecture this dll was build for
1533 ::_snprintf(ebuf, ebuflen - 1,
1534 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1535 lib_arch, running_arch_str);
1536 }
1537
1538 return NULL;
1539 }
1540
1541 void os::print_dll_info(outputStream *st) {
1542 st->print_cr("Dynamic libraries:");
1543 get_loaded_modules_info(_print_module, (void *)st);
1544 }
1545
1546 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1547 HANDLE hProcess;
1548
1549 # define MAX_NUM_MODULES 128
1550 HMODULE modules[MAX_NUM_MODULES];
1551 static char filename[MAX_PATH];
1552 int result = 0;
1553
1554 int pid = os::current_process_id();
1555 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1556 FALSE, pid);
1557 if (hProcess == NULL) return 0;
1558
1559 DWORD size_needed;
1560 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1561 CloseHandle(hProcess);
1562 return 0;
1563 }
1564
1565 // number of modules that are currently loaded
1566 int num_modules = size_needed / sizeof(HMODULE);
1567
1568 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1569 // Get Full pathname:
1570 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1571 filename[0] = '\0';
1572 }
1573
1574 MODULEINFO modinfo;
1575 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1576 modinfo.lpBaseOfDll = NULL;
1577 modinfo.SizeOfImage = 0;
1578 }
1579
1580 // Invoke callback function
1581 result = callback(filename, (address)modinfo.lpBaseOfDll,
1582 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1583 if (result) break;
1584 }
1585
1586 CloseHandle(hProcess);
1587 return result;
1588 }
1589
1590 bool os::get_host_name(char* buf, size_t buflen) {
1591 DWORD size = (DWORD)buflen;
1592 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1593 }
1594
1595 void os::get_summary_os_info(char* buf, size_t buflen) {
1596 stringStream sst(buf, buflen);
1597 os::win32::print_windows_version(&sst);
1598 // chop off newline character
1599 char* nl = strchr(buf, '\n');
1600 if (nl != NULL) *nl = '\0';
1601 }
1602
1603 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1604 int ret = vsnprintf(buf, len, fmt, args);
1605 // Get the correct buffer size if buf is too small
1606 if (ret < 0) {
1607 return _vscprintf(fmt, args);
1608 }
1609 return ret;
1610 }
1611
1612 static inline time_t get_mtime(const char* filename) {
1613 struct stat st;
1614 int ret = os::stat(filename, &st);
1615 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1616 return st.st_mtime;
1617 }
1618
1619 int os::compare_file_modified_times(const char* file1, const char* file2) {
1620 time_t t1 = get_mtime(file1);
1621 time_t t2 = get_mtime(file2);
1622 return t1 - t2;
1623 }
1624
1625 void os::print_os_info_brief(outputStream* st) {
1626 os::print_os_info(st);
1627 }
1628
1629 void os::print_os_info(outputStream* st) {
1630 #ifdef ASSERT
1631 char buffer[1024];
1632 st->print("HostName: ");
1633 if (get_host_name(buffer, sizeof(buffer))) {
1634 st->print("%s ", buffer);
1635 } else {
1636 st->print("N/A ");
1637 }
1638 #endif
1639 st->print("OS:");
1640 os::win32::print_windows_version(st);
1641 }
1642
1643 void os::win32::print_windows_version(outputStream* st) {
1644 OSVERSIONINFOEX osvi;
1645 VS_FIXEDFILEINFO *file_info;
1646 TCHAR kernel32_path[MAX_PATH];
1647 UINT len, ret;
1648
1649 // Use the GetVersionEx information to see if we're on a server or
1650 // workstation edition of Windows. Starting with Windows 8.1 we can't
1651 // trust the OS version information returned by this API.
1652 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1653 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1654 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1655 st->print_cr("Call to GetVersionEx failed");
1656 return;
1657 }
1658 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1659
1660 // Get the full path to \Windows\System32\kernel32.dll and use that for
1661 // determining what version of Windows we're running on.
1662 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1663 ret = GetSystemDirectory(kernel32_path, len);
1664 if (ret == 0 || ret > len) {
1665 st->print_cr("Call to GetSystemDirectory failed");
1666 return;
1667 }
1668 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1669
1670 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1671 if (version_size == 0) {
1672 st->print_cr("Call to GetFileVersionInfoSize failed");
1673 return;
1674 }
1675
1676 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1677 if (version_info == NULL) {
1678 st->print_cr("Failed to allocate version_info");
1679 return;
1680 }
1681
1682 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1683 os::free(version_info);
1684 st->print_cr("Call to GetFileVersionInfo failed");
1685 return;
1686 }
1687
1688 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1689 os::free(version_info);
1690 st->print_cr("Call to VerQueryValue failed");
1691 return;
1692 }
1693
1694 int major_version = HIWORD(file_info->dwProductVersionMS);
1695 int minor_version = LOWORD(file_info->dwProductVersionMS);
1696 int build_number = HIWORD(file_info->dwProductVersionLS);
1697 int build_minor = LOWORD(file_info->dwProductVersionLS);
1698 int os_vers = major_version * 1000 + minor_version;
1699 os::free(version_info);
1700
1701 st->print(" Windows ");
1702 switch (os_vers) {
1703
1704 case 6000:
1705 if (is_workstation) {
1706 st->print("Vista");
1707 } else {
1708 st->print("Server 2008");
1709 }
1710 break;
1711
1712 case 6001:
1713 if (is_workstation) {
1714 st->print("7");
1715 } else {
1716 st->print("Server 2008 R2");
1717 }
1718 break;
1719
1720 case 6002:
1721 if (is_workstation) {
1722 st->print("8");
1723 } else {
1724 st->print("Server 2012");
1725 }
1726 break;
1727
1728 case 6003:
1729 if (is_workstation) {
1730 st->print("8.1");
1731 } else {
1732 st->print("Server 2012 R2");
1733 }
1734 break;
1735
1736 case 10000:
1737 if (is_workstation) {
1738 st->print("10");
1739 } else {
1740 st->print("Server 2016");
1741 }
1742 break;
1743
1744 default:
1745 // Unrecognized windows, print out its major and minor versions
1746 st->print("%d.%d", major_version, minor_version);
1747 break;
1748 }
1749
1750 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1751 // find out whether we are running on 64 bit processor or not
1752 SYSTEM_INFO si;
1753 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1754 GetNativeSystemInfo(&si);
1755 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1756 st->print(" , 64 bit");
1757 }
1758
1759 st->print(" Build %d", build_number);
1760 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1761 st->cr();
1762 }
1763
1764 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1765 // Nothing to do for now.
1766 }
1767
1768 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1769 HKEY key;
1770 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1771 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1772 if (status == ERROR_SUCCESS) {
1773 DWORD size = (DWORD)buflen;
1774 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1775 if (status != ERROR_SUCCESS) {
1776 strncpy(buf, "## __CPU__", buflen);
1777 }
1778 RegCloseKey(key);
1779 } else {
1780 // Put generic cpu info to return
1781 strncpy(buf, "## __CPU__", buflen);
1782 }
1783 }
1784
1785 void os::print_memory_info(outputStream* st) {
1786 st->print("Memory:");
1787 st->print(" %dk page", os::vm_page_size()>>10);
1788
1789 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1790 // value if total memory is larger than 4GB
1791 MEMORYSTATUSEX ms;
1792 ms.dwLength = sizeof(ms);
1793 GlobalMemoryStatusEx(&ms);
1794
1795 st->print(", physical %uk", os::physical_memory() >> 10);
1796 st->print("(%uk free)", os::available_memory() >> 10);
1797
1798 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1799 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1800 st->cr();
1801 }
1802
1803 void os::print_siginfo(outputStream *st, const void* siginfo) {
1804 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1805 st->print("siginfo:");
1806
1807 char tmp[64];
1808 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1809 strcpy(tmp, "EXCEPTION_??");
1810 }
1811 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1812
1813 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1814 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1815 er->NumberParameters >= 2) {
1816 switch (er->ExceptionInformation[0]) {
1817 case 0: st->print(", reading address"); break;
1818 case 1: st->print(", writing address"); break;
1819 case 8: st->print(", data execution prevention violation at address"); break;
1820 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1821 er->ExceptionInformation[0]);
1822 }
1823 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1824 } else {
1825 int num = er->NumberParameters;
1826 if (num > 0) {
1827 st->print(", ExceptionInformation=");
1828 for (int i = 0; i < num; i++) {
1829 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1830 }
1831 }
1832 }
1833 st->cr();
1834 }
1835
1836 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1837 // do nothing
1838 }
1839
1840 static char saved_jvm_path[MAX_PATH] = {0};
1841
1842 // Find the full path to the current module, jvm.dll
1843 void os::jvm_path(char *buf, jint buflen) {
1844 // Error checking.
1845 if (buflen < MAX_PATH) {
1846 assert(false, "must use a large-enough buffer");
1847 buf[0] = '\0';
1848 return;
1849 }
1850 // Lazy resolve the path to current module.
1851 if (saved_jvm_path[0] != 0) {
1852 strcpy(buf, saved_jvm_path);
1853 return;
1854 }
1855
1856 buf[0] = '\0';
1857 if (Arguments::sun_java_launcher_is_altjvm()) {
1858 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1859 // for a JAVA_HOME environment variable and fix up the path so it
1860 // looks like jvm.dll is installed there (append a fake suffix
1861 // hotspot/jvm.dll).
1862 char* java_home_var = ::getenv("JAVA_HOME");
1863 if (java_home_var != NULL && java_home_var[0] != 0 &&
1864 strlen(java_home_var) < (size_t)buflen) {
1865 strncpy(buf, java_home_var, buflen);
1866
1867 // determine if this is a legacy image or modules image
1868 // modules image doesn't have "jre" subdirectory
1869 size_t len = strlen(buf);
1870 char* jrebin_p = buf + len;
1871 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1872 if (0 != _access(buf, 0)) {
1873 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1874 }
1875 len = strlen(buf);
1876 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1877 }
1878 }
1879
1880 if (buf[0] == '\0') {
1881 GetModuleFileName(vm_lib_handle, buf, buflen);
1882 }
1883 strncpy(saved_jvm_path, buf, MAX_PATH);
1884 saved_jvm_path[MAX_PATH - 1] = '\0';
1885 }
1886
1887
1888 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1889 #ifndef _WIN64
1890 st->print("_");
1891 #endif
1892 }
1893
1894
1895 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1896 #ifndef _WIN64
1897 st->print("@%d", args_size * sizeof(int));
1898 #endif
1899 }
1900
1901 // This method is a copy of JDK's sysGetLastErrorString
1902 // from src/windows/hpi/src/system_md.c
1903
1904 size_t os::lasterror(char* buf, size_t len) {
1905 DWORD errval;
1906
1907 if ((errval = GetLastError()) != 0) {
1908 // DOS error
1909 size_t n = (size_t)FormatMessage(
1910 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1911 NULL,
1912 errval,
1913 0,
1914 buf,
1915 (DWORD)len,
1916 NULL);
1917 if (n > 3) {
1918 // Drop final '.', CR, LF
1919 if (buf[n - 1] == '\n') n--;
1920 if (buf[n - 1] == '\r') n--;
1921 if (buf[n - 1] == '.') n--;
1922 buf[n] = '\0';
1923 }
1924 return n;
1925 }
1926
1927 if (errno != 0) {
1928 // C runtime error that has no corresponding DOS error code
1929 const char* s = os::strerror(errno);
1930 size_t n = strlen(s);
1931 if (n >= len) n = len - 1;
1932 strncpy(buf, s, n);
1933 buf[n] = '\0';
1934 return n;
1935 }
1936
1937 return 0;
1938 }
1939
1940 int os::get_last_error() {
1941 DWORD error = GetLastError();
1942 if (error == 0) {
1943 error = errno;
1944 }
1945 return (int)error;
1946 }
1947
1948 WindowsSemaphore::WindowsSemaphore(uint value) {
1949 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1950
1951 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1952 }
1953
1954 WindowsSemaphore::~WindowsSemaphore() {
1955 ::CloseHandle(_semaphore);
1956 }
1957
1958 void WindowsSemaphore::signal(uint count) {
1959 if (count > 0) {
1960 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1961
1962 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1963 }
1964 }
1965
1966 void WindowsSemaphore::wait() {
1967 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1968 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1969 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1970 }
1971
1972 // sun.misc.Signal
1973 // NOTE that this is a workaround for an apparent kernel bug where if
1974 // a signal handler for SIGBREAK is installed then that signal handler
1975 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1976 // See bug 4416763.
1977 static void (*sigbreakHandler)(int) = NULL;
1978
1979 static void UserHandler(int sig, void *siginfo, void *context) {
1980 os::signal_notify(sig);
1981 // We need to reinstate the signal handler each time...
1982 os::signal(sig, (void*)UserHandler);
1983 }
1984
1985 void* os::user_handler() {
1986 return (void*) UserHandler;
1987 }
1988
1989 void* os::signal(int signal_number, void* handler) {
1990 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1991 void (*oldHandler)(int) = sigbreakHandler;
1992 sigbreakHandler = (void (*)(int)) handler;
1993 return (void*) oldHandler;
1994 } else {
1995 return (void*)::signal(signal_number, (void (*)(int))handler);
1996 }
1997 }
1998
1999 void os::signal_raise(int signal_number) {
2000 raise(signal_number);
2001 }
2002
2003 // The Win32 C runtime library maps all console control events other than ^C
2004 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2005 // logoff, and shutdown events. We therefore install our own console handler
2006 // that raises SIGTERM for the latter cases.
2007 //
2008 static BOOL WINAPI consoleHandler(DWORD event) {
2009 switch (event) {
2010 case CTRL_C_EVENT:
2011 if (is_error_reported()) {
2012 // Ctrl-C is pressed during error reporting, likely because the error
2013 // handler fails to abort. Let VM die immediately.
2014 os::die();
2015 }
2016
2017 os::signal_raise(SIGINT);
2018 return TRUE;
2019 break;
2020 case CTRL_BREAK_EVENT:
2021 if (sigbreakHandler != NULL) {
2022 (*sigbreakHandler)(SIGBREAK);
2023 }
2024 return TRUE;
2025 break;
2026 case CTRL_LOGOFF_EVENT: {
2027 // Don't terminate JVM if it is running in a non-interactive session,
2028 // such as a service process.
2029 USEROBJECTFLAGS flags;
2030 HANDLE handle = GetProcessWindowStation();
2031 if (handle != NULL &&
2032 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2033 sizeof(USEROBJECTFLAGS), NULL)) {
2034 // If it is a non-interactive session, let next handler to deal
2035 // with it.
2036 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2037 return FALSE;
2038 }
2039 }
2040 }
2041 case CTRL_CLOSE_EVENT:
2042 case CTRL_SHUTDOWN_EVENT:
2043 os::signal_raise(SIGTERM);
2044 return TRUE;
2045 break;
2046 default:
2047 break;
2048 }
2049 return FALSE;
2050 }
2051
2052 // The following code is moved from os.cpp for making this
2053 // code platform specific, which it is by its very nature.
2054
2055 // Return maximum OS signal used + 1 for internal use only
2056 // Used as exit signal for signal_thread
2057 int os::sigexitnum_pd() {
2058 return NSIG;
2059 }
2060
2061 // a counter for each possible signal value, including signal_thread exit signal
2062 static volatile jint pending_signals[NSIG+1] = { 0 };
2063 static HANDLE sig_sem = NULL;
2064
2065 void os::signal_init_pd() {
2066 // Initialize signal structures
2067 memset((void*)pending_signals, 0, sizeof(pending_signals));
2068
2069 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2070
2071 // Programs embedding the VM do not want it to attempt to receive
2072 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2073 // shutdown hooks mechanism introduced in 1.3. For example, when
2074 // the VM is run as part of a Windows NT service (i.e., a servlet
2075 // engine in a web server), the correct behavior is for any console
2076 // control handler to return FALSE, not TRUE, because the OS's
2077 // "final" handler for such events allows the process to continue if
2078 // it is a service (while terminating it if it is not a service).
2079 // To make this behavior uniform and the mechanism simpler, we
2080 // completely disable the VM's usage of these console events if -Xrs
2081 // (=ReduceSignalUsage) is specified. This means, for example, that
2082 // the CTRL-BREAK thread dump mechanism is also disabled in this
2083 // case. See bugs 4323062, 4345157, and related bugs.
2084
2085 if (!ReduceSignalUsage) {
2086 // Add a CTRL-C handler
2087 SetConsoleCtrlHandler(consoleHandler, TRUE);
2088 }
2089 }
2090
2091 void os::signal_notify(int signal_number) {
2092 BOOL ret;
2093 if (sig_sem != NULL) {
2094 Atomic::inc(&pending_signals[signal_number]);
2095 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2096 assert(ret != 0, "ReleaseSemaphore() failed");
2097 }
2098 }
2099
2100 static int check_pending_signals(bool wait_for_signal) {
2101 DWORD ret;
2102 while (true) {
2103 for (int i = 0; i < NSIG + 1; i++) {
2104 jint n = pending_signals[i];
2105 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2106 return i;
2107 }
2108 }
2109 if (!wait_for_signal) {
2110 return -1;
2111 }
2112
2113 JavaThread *thread = JavaThread::current();
2114
2115 ThreadBlockInVM tbivm(thread);
2116
2117 bool threadIsSuspended;
2118 do {
2119 thread->set_suspend_equivalent();
2120 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2121 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2122 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2123
2124 // were we externally suspended while we were waiting?
2125 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2126 if (threadIsSuspended) {
2127 // The semaphore has been incremented, but while we were waiting
2128 // another thread suspended us. We don't want to continue running
2129 // while suspended because that would surprise the thread that
2130 // suspended us.
2131 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2132 assert(ret != 0, "ReleaseSemaphore() failed");
2133
2134 thread->java_suspend_self();
2135 }
2136 } while (threadIsSuspended);
2137 }
2138 }
2139
2140 int os::signal_lookup() {
2141 return check_pending_signals(false);
2142 }
2143
2144 int os::signal_wait() {
2145 return check_pending_signals(true);
2146 }
2147
2148 // Implicit OS exception handling
2149
2150 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2151 address handler) {
2152 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2153 // Save pc in thread
2154 #ifdef _M_IA64
2155 // Do not blow up if no thread info available.
2156 if (thread) {
2157 // Saving PRECISE pc (with slot information) in thread.
2158 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2159 // Convert precise PC into "Unix" format
2160 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2161 thread->set_saved_exception_pc((address)precise_pc);
2162 }
2163 // Set pc to handler
2164 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2165 // Clear out psr.ri (= Restart Instruction) in order to continue
2166 // at the beginning of the target bundle.
2167 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2168 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2169 #else
2170 #ifdef _M_AMD64
2171 // Do not blow up if no thread info available.
2172 if (thread) {
2173 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2174 }
2175 // Set pc to handler
2176 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2177 #else
2178 // Do not blow up if no thread info available.
2179 if (thread) {
2180 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2181 }
2182 // Set pc to handler
2183 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2184 #endif
2185 #endif
2186
2187 // Continue the execution
2188 return EXCEPTION_CONTINUE_EXECUTION;
2189 }
2190
2191
2192 // Used for PostMortemDump
2193 extern "C" void safepoints();
2194 extern "C" void find(int x);
2195 extern "C" void events();
2196
2197 // According to Windows API documentation, an illegal instruction sequence should generate
2198 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2199 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2200 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2201
2202 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2203
2204 // From "Execution Protection in the Windows Operating System" draft 0.35
2205 // Once a system header becomes available, the "real" define should be
2206 // included or copied here.
2207 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2208
2209 // Handle NAT Bit consumption on IA64.
2210 #ifdef _M_IA64
2211 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2212 #endif
2213
2214 // Windows Vista/2008 heap corruption check
2215 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2216
2217 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2218 // C++ compiler contain this error code. Because this is a compiler-generated
2219 // error, the code is not listed in the Win32 API header files.
2220 // The code is actually a cryptic mnemonic device, with the initial "E"
2221 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2222 // ASCII values of "msc".
2223
2224 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2225
2226 #define def_excpt(val) { #val, (val) }
2227
2228 static const struct { char* name; uint number; } exceptlabels[] = {
2229 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2230 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2231 def_excpt(EXCEPTION_BREAKPOINT),
2232 def_excpt(EXCEPTION_SINGLE_STEP),
2233 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2234 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2235 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2236 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2237 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2238 def_excpt(EXCEPTION_FLT_OVERFLOW),
2239 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2240 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2241 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2242 def_excpt(EXCEPTION_INT_OVERFLOW),
2243 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2244 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2245 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2246 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2247 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2248 def_excpt(EXCEPTION_STACK_OVERFLOW),
2249 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2250 def_excpt(EXCEPTION_GUARD_PAGE),
2251 def_excpt(EXCEPTION_INVALID_HANDLE),
2252 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2253 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2254 #ifdef _M_IA64
2255 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2256 #endif
2257 };
2258
2259 #undef def_excpt
2260
2261 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2262 uint code = static_cast<uint>(exception_code);
2263 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2264 if (exceptlabels[i].number == code) {
2265 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2266 return buf;
2267 }
2268 }
2269
2270 return NULL;
2271 }
2272
2273 //-----------------------------------------------------------------------------
2274 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2275 // handle exception caused by idiv; should only happen for -MinInt/-1
2276 // (division by zero is handled explicitly)
2277 #ifdef _M_IA64
2278 assert(0, "Fix Handle_IDiv_Exception");
2279 #else
2280 #ifdef _M_AMD64
2281 PCONTEXT ctx = exceptionInfo->ContextRecord;
2282 address pc = (address)ctx->Rip;
2283 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2284 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2285 if (pc[0] == 0xF7) {
2286 // set correct result values and continue after idiv instruction
2287 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2288 } else {
2289 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2290 }
2291 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2292 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2293 // idiv opcode (0xF7).
2294 ctx->Rdx = (DWORD)0; // remainder
2295 // Continue the execution
2296 #else
2297 PCONTEXT ctx = exceptionInfo->ContextRecord;
2298 address pc = (address)ctx->Eip;
2299 assert(pc[0] == 0xF7, "not an idiv opcode");
2300 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2301 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2302 // set correct result values and continue after idiv instruction
2303 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2304 ctx->Eax = (DWORD)min_jint; // result
2305 ctx->Edx = (DWORD)0; // remainder
2306 // Continue the execution
2307 #endif
2308 #endif
2309 return EXCEPTION_CONTINUE_EXECUTION;
2310 }
2311
2312 //-----------------------------------------------------------------------------
2313 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2314 PCONTEXT ctx = exceptionInfo->ContextRecord;
2315 #ifndef _WIN64
2316 // handle exception caused by native method modifying control word
2317 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2318
2319 switch (exception_code) {
2320 case EXCEPTION_FLT_DENORMAL_OPERAND:
2321 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2322 case EXCEPTION_FLT_INEXACT_RESULT:
2323 case EXCEPTION_FLT_INVALID_OPERATION:
2324 case EXCEPTION_FLT_OVERFLOW:
2325 case EXCEPTION_FLT_STACK_CHECK:
2326 case EXCEPTION_FLT_UNDERFLOW:
2327 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2328 if (fp_control_word != ctx->FloatSave.ControlWord) {
2329 // Restore FPCW and mask out FLT exceptions
2330 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2331 // Mask out pending FLT exceptions
2332 ctx->FloatSave.StatusWord &= 0xffffff00;
2333 return EXCEPTION_CONTINUE_EXECUTION;
2334 }
2335 }
2336
2337 if (prev_uef_handler != NULL) {
2338 // We didn't handle this exception so pass it to the previous
2339 // UnhandledExceptionFilter.
2340 return (prev_uef_handler)(exceptionInfo);
2341 }
2342 #else // !_WIN64
2343 // On Windows, the mxcsr control bits are non-volatile across calls
2344 // See also CR 6192333
2345 //
2346 jint MxCsr = INITIAL_MXCSR;
2347 // we can't use StubRoutines::addr_mxcsr_std()
2348 // because in Win64 mxcsr is not saved there
2349 if (MxCsr != ctx->MxCsr) {
2350 ctx->MxCsr = MxCsr;
2351 return EXCEPTION_CONTINUE_EXECUTION;
2352 }
2353 #endif // !_WIN64
2354
2355 return EXCEPTION_CONTINUE_SEARCH;
2356 }
2357
2358 static inline void report_error(Thread* t, DWORD exception_code,
2359 address addr, void* siginfo, void* context) {
2360 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2361
2362 // If UseOsErrorReporting, this will return here and save the error file
2363 // somewhere where we can find it in the minidump.
2364 }
2365
2366 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2367 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2368 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2369 address addr = (address) exceptionRecord->ExceptionInformation[1];
2370 if (Interpreter::contains(pc)) {
2371 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2372 if (!fr->is_first_java_frame()) {
2373 assert(fr->safe_for_sender(thread), "Safety check");
2374 *fr = fr->java_sender();
2375 }
2376 } else {
2377 // more complex code with compiled code
2378 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2379 CodeBlob* cb = CodeCache::find_blob(pc);
2380 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2381 // Not sure where the pc points to, fallback to default
2382 // stack overflow handling
2383 return false;
2384 } else {
2385 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2386 // in compiled code, the stack banging is performed just after the return pc
2387 // has been pushed on the stack
2388 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2389 if (!fr->is_java_frame()) {
2390 assert(fr->safe_for_sender(thread), "Safety check");
2391 *fr = fr->java_sender();
2392 }
2393 }
2394 }
2395 assert(fr->is_java_frame(), "Safety check");
2396 return true;
2397 }
2398
2399 //-----------------------------------------------------------------------------
2400 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2401 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2402 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2403 #ifdef _M_IA64
2404 // On Itanium, we need the "precise pc", which has the slot number coded
2405 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2406 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2407 // Convert the pc to "Unix format", which has the slot number coded
2408 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2409 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2410 // information is saved in the Unix format.
2411 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2412 #else
2413 #ifdef _M_AMD64
2414 address pc = (address) exceptionInfo->ContextRecord->Rip;
2415 #else
2416 address pc = (address) exceptionInfo->ContextRecord->Eip;
2417 #endif
2418 #endif
2419 Thread* t = Thread::current_or_null_safe();
2420
2421 // Handle SafeFetch32 and SafeFetchN exceptions.
2422 if (StubRoutines::is_safefetch_fault(pc)) {
2423 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2424 }
2425
2426 #ifndef _WIN64
2427 // Execution protection violation - win32 running on AMD64 only
2428 // Handled first to avoid misdiagnosis as a "normal" access violation;
2429 // This is safe to do because we have a new/unique ExceptionInformation
2430 // code for this condition.
2431 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2432 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2433 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2434 address addr = (address) exceptionRecord->ExceptionInformation[1];
2435
2436 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2437 int page_size = os::vm_page_size();
2438
2439 // Make sure the pc and the faulting address are sane.
2440 //
2441 // If an instruction spans a page boundary, and the page containing
2442 // the beginning of the instruction is executable but the following
2443 // page is not, the pc and the faulting address might be slightly
2444 // different - we still want to unguard the 2nd page in this case.
2445 //
2446 // 15 bytes seems to be a (very) safe value for max instruction size.
2447 bool pc_is_near_addr =
2448 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2449 bool instr_spans_page_boundary =
2450 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2451 (intptr_t) page_size) > 0);
2452
2453 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2454 static volatile address last_addr =
2455 (address) os::non_memory_address_word();
2456
2457 // In conservative mode, don't unguard unless the address is in the VM
2458 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2459 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2460
2461 // Set memory to RWX and retry
2462 address page_start =
2463 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2464 bool res = os::protect_memory((char*) page_start, page_size,
2465 os::MEM_PROT_RWX);
2466
2467 log_debug(os)("Execution protection violation "
2468 "at " INTPTR_FORMAT
2469 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2470 p2i(page_start), (res ? "success" : os::strerror(errno)));
2471
2472 // Set last_addr so if we fault again at the same address, we don't
2473 // end up in an endless loop.
2474 //
2475 // There are two potential complications here. Two threads trapping
2476 // at the same address at the same time could cause one of the
2477 // threads to think it already unguarded, and abort the VM. Likely
2478 // very rare.
2479 //
2480 // The other race involves two threads alternately trapping at
2481 // different addresses and failing to unguard the page, resulting in
2482 // an endless loop. This condition is probably even more unlikely
2483 // than the first.
2484 //
2485 // Although both cases could be avoided by using locks or thread
2486 // local last_addr, these solutions are unnecessary complication:
2487 // this handler is a best-effort safety net, not a complete solution.
2488 // It is disabled by default and should only be used as a workaround
2489 // in case we missed any no-execute-unsafe VM code.
2490
2491 last_addr = addr;
2492
2493 return EXCEPTION_CONTINUE_EXECUTION;
2494 }
2495 }
2496
2497 // Last unguard failed or not unguarding
2498 tty->print_raw_cr("Execution protection violation");
2499 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2500 exceptionInfo->ContextRecord);
2501 return EXCEPTION_CONTINUE_SEARCH;
2502 }
2503 }
2504 #endif // _WIN64
2505
2506 // Check to see if we caught the safepoint code in the
2507 // process of write protecting the memory serialization page.
2508 // It write enables the page immediately after protecting it
2509 // so just return.
2510 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2511 JavaThread* thread = (JavaThread*) t;
2512 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2513 address addr = (address) exceptionRecord->ExceptionInformation[1];
2514 if (os::is_memory_serialize_page(thread, addr)) {
2515 // Block current thread until the memory serialize page permission restored.
2516 os::block_on_serialize_page_trap();
2517 return EXCEPTION_CONTINUE_EXECUTION;
2518 }
2519 }
2520
2521 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2522 VM_Version::is_cpuinfo_segv_addr(pc)) {
2523 // Verify that OS save/restore AVX registers.
2524 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2525 }
2526
2527 if (t != NULL && t->is_Java_thread()) {
2528 JavaThread* thread = (JavaThread*) t;
2529 bool in_java = thread->thread_state() == _thread_in_Java;
2530
2531 // Handle potential stack overflows up front.
2532 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2533 #ifdef _M_IA64
2534 // Use guard page for register stack.
2535 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2536 address addr = (address) exceptionRecord->ExceptionInformation[1];
2537 // Check for a register stack overflow on Itanium
2538 if (thread->addr_inside_register_stack_red_zone(addr)) {
2539 // Fatal red zone violation happens if the Java program
2540 // catches a StackOverflow error and does so much processing
2541 // that it runs beyond the unprotected yellow guard zone. As
2542 // a result, we are out of here.
2543 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2544 } else if(thread->addr_inside_register_stack(addr)) {
2545 // Disable the yellow zone which sets the state that
2546 // we've got a stack overflow problem.
2547 if (thread->stack_yellow_reserved_zone_enabled()) {
2548 thread->disable_stack_yellow_reserved_zone();
2549 }
2550 // Give us some room to process the exception.
2551 thread->disable_register_stack_guard();
2552 // Tracing with +Verbose.
2553 if (Verbose) {
2554 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2555 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2556 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2557 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2558 thread->register_stack_base(),
2559 thread->register_stack_base() + thread->stack_size());
2560 }
2561
2562 // Reguard the permanent register stack red zone just to be sure.
2563 // We saw Windows silently disabling this without telling us.
2564 thread->enable_register_stack_red_zone();
2565
2566 return Handle_Exception(exceptionInfo,
2567 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2568 }
2569 #endif
2570 if (thread->stack_guards_enabled()) {
2571 if (_thread_in_Java) {
2572 frame fr;
2573 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2574 address addr = (address) exceptionRecord->ExceptionInformation[1];
2575 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2576 assert(fr.is_java_frame(), "Must be a Java frame");
2577 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2578 }
2579 }
2580 // Yellow zone violation. The o/s has unprotected the first yellow
2581 // zone page for us. Note: must call disable_stack_yellow_zone to
2582 // update the enabled status, even if the zone contains only one page.
2583 thread->disable_stack_yellow_reserved_zone();
2584 // If not in java code, return and hope for the best.
2585 return in_java
2586 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2587 : EXCEPTION_CONTINUE_EXECUTION;
2588 } else {
2589 // Fatal red zone violation.
2590 thread->disable_stack_red_zone();
2591 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2592 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2593 exceptionInfo->ContextRecord);
2594 return EXCEPTION_CONTINUE_SEARCH;
2595 }
2596 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2597 // Either stack overflow or null pointer exception.
2598 if (in_java) {
2599 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2600 address addr = (address) exceptionRecord->ExceptionInformation[1];
2601 address stack_end = thread->stack_end();
2602 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2603 // Stack overflow.
2604 assert(!os::uses_stack_guard_pages(),
2605 "should be caught by red zone code above.");
2606 return Handle_Exception(exceptionInfo,
2607 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2608 }
2609 // Check for safepoint polling and implicit null
2610 // We only expect null pointers in the stubs (vtable)
2611 // the rest are checked explicitly now.
2612 CodeBlob* cb = CodeCache::find_blob(pc);
2613 if (cb != NULL) {
2614 if (os::is_poll_address(addr)) {
2615 address stub = SharedRuntime::get_poll_stub(pc);
2616 return Handle_Exception(exceptionInfo, stub);
2617 }
2618 }
2619 {
2620 #ifdef _WIN64
2621 // If it's a legal stack address map the entire region in
2622 //
2623 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2624 address addr = (address) exceptionRecord->ExceptionInformation[1];
2625 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2626 addr = (address)((uintptr_t)addr &
2627 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2628 os::commit_memory((char *)addr, thread->stack_base() - addr,
2629 !ExecMem);
2630 return EXCEPTION_CONTINUE_EXECUTION;
2631 } else
2632 #endif
2633 {
2634 // Null pointer exception.
2635 #ifdef _M_IA64
2636 // Process implicit null checks in compiled code. Note: Implicit null checks
2637 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2638 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2639 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2640 // Handle implicit null check in UEP method entry
2641 if (cb && (cb->is_frame_complete_at(pc) ||
2642 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2643 if (Verbose) {
2644 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2645 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2646 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2647 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2648 *(bundle_start + 1), *bundle_start);
2649 }
2650 return Handle_Exception(exceptionInfo,
2651 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2652 }
2653 }
2654
2655 // Implicit null checks were processed above. Hence, we should not reach
2656 // here in the usual case => die!
2657 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2658 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2659 exceptionInfo->ContextRecord);
2660 return EXCEPTION_CONTINUE_SEARCH;
2661
2662 #else // !IA64
2663
2664 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2665 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2666 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2667 }
2668 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2669 exceptionInfo->ContextRecord);
2670 return EXCEPTION_CONTINUE_SEARCH;
2671 #endif
2672 }
2673 }
2674 }
2675
2676 #ifdef _WIN64
2677 // Special care for fast JNI field accessors.
2678 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2679 // in and the heap gets shrunk before the field access.
2680 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2681 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2682 if (addr != (address)-1) {
2683 return Handle_Exception(exceptionInfo, addr);
2684 }
2685 }
2686 #endif
2687
2688 // Stack overflow or null pointer exception in native code.
2689 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2690 exceptionInfo->ContextRecord);
2691 return EXCEPTION_CONTINUE_SEARCH;
2692 } // /EXCEPTION_ACCESS_VIOLATION
2693 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2694 #if defined _M_IA64
2695 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2696 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2697 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2698
2699 // Compiled method patched to be non entrant? Following conditions must apply:
2700 // 1. must be first instruction in bundle
2701 // 2. must be a break instruction with appropriate code
2702 if ((((uint64_t) pc & 0x0F) == 0) &&
2703 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2704 return Handle_Exception(exceptionInfo,
2705 (address)SharedRuntime::get_handle_wrong_method_stub());
2706 }
2707 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2708 #endif
2709
2710
2711 if (in_java) {
2712 switch (exception_code) {
2713 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2714 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2715
2716 case EXCEPTION_INT_OVERFLOW:
2717 return Handle_IDiv_Exception(exceptionInfo);
2718
2719 } // switch
2720 }
2721 if (((thread->thread_state() == _thread_in_Java) ||
2722 (thread->thread_state() == _thread_in_native)) &&
2723 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2724 LONG result=Handle_FLT_Exception(exceptionInfo);
2725 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2726 }
2727 }
2728
2729 if (exception_code != EXCEPTION_BREAKPOINT) {
2730 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2731 exceptionInfo->ContextRecord);
2732 }
2733 return EXCEPTION_CONTINUE_SEARCH;
2734 }
2735
2736 #ifndef _WIN64
2737 // Special care for fast JNI accessors.
2738 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2739 // the heap gets shrunk before the field access.
2740 // Need to install our own structured exception handler since native code may
2741 // install its own.
2742 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2743 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2744 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2745 address pc = (address) exceptionInfo->ContextRecord->Eip;
2746 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2747 if (addr != (address)-1) {
2748 return Handle_Exception(exceptionInfo, addr);
2749 }
2750 }
2751 return EXCEPTION_CONTINUE_SEARCH;
2752 }
2753
2754 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2755 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2756 jobject obj, \
2757 jfieldID fieldID) { \
2758 __try { \
2759 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2760 obj, \
2761 fieldID); \
2762 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2763 _exception_info())) { \
2764 } \
2765 return 0; \
2766 }
2767
2768 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2769 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2770 DEFINE_FAST_GETFIELD(jchar, char, Char)
2771 DEFINE_FAST_GETFIELD(jshort, short, Short)
2772 DEFINE_FAST_GETFIELD(jint, int, Int)
2773 DEFINE_FAST_GETFIELD(jlong, long, Long)
2774 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2775 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2776
2777 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2778 switch (type) {
2779 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2780 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2781 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2782 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2783 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2784 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2785 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2786 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2787 default: ShouldNotReachHere();
2788 }
2789 return (address)-1;
2790 }
2791 #endif
2792
2793 // Virtual Memory
2794
2795 int os::vm_page_size() { return os::win32::vm_page_size(); }
2796 int os::vm_allocation_granularity() {
2797 return os::win32::vm_allocation_granularity();
2798 }
2799
2800 // Windows large page support is available on Windows 2003. In order to use
2801 // large page memory, the administrator must first assign additional privilege
2802 // to the user:
2803 // + select Control Panel -> Administrative Tools -> Local Security Policy
2804 // + select Local Policies -> User Rights Assignment
2805 // + double click "Lock pages in memory", add users and/or groups
2806 // + reboot
2807 // Note the above steps are needed for administrator as well, as administrators
2808 // by default do not have the privilege to lock pages in memory.
2809 //
2810 // Note about Windows 2003: although the API supports committing large page
2811 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2812 // scenario, I found through experiment it only uses large page if the entire
2813 // memory region is reserved and committed in a single VirtualAlloc() call.
2814 // This makes Windows large page support more or less like Solaris ISM, in
2815 // that the entire heap must be committed upfront. This probably will change
2816 // in the future, if so the code below needs to be revisited.
2817
2818 #ifndef MEM_LARGE_PAGES
2819 #define MEM_LARGE_PAGES 0x20000000
2820 #endif
2821
2822 static HANDLE _hProcess;
2823 static HANDLE _hToken;
2824
2825 // Container for NUMA node list info
2826 class NUMANodeListHolder {
2827 private:
2828 int *_numa_used_node_list; // allocated below
2829 int _numa_used_node_count;
2830
2831 void free_node_list() {
2832 if (_numa_used_node_list != NULL) {
2833 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2834 }
2835 }
2836
2837 public:
2838 NUMANodeListHolder() {
2839 _numa_used_node_count = 0;
2840 _numa_used_node_list = NULL;
2841 // do rest of initialization in build routine (after function pointers are set up)
2842 }
2843
2844 ~NUMANodeListHolder() {
2845 free_node_list();
2846 }
2847
2848 bool build() {
2849 DWORD_PTR proc_aff_mask;
2850 DWORD_PTR sys_aff_mask;
2851 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2852 ULONG highest_node_number;
2853 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2854 free_node_list();
2855 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2856 for (unsigned int i = 0; i <= highest_node_number; i++) {
2857 ULONGLONG proc_mask_numa_node;
2858 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2859 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2860 _numa_used_node_list[_numa_used_node_count++] = i;
2861 }
2862 }
2863 return (_numa_used_node_count > 1);
2864 }
2865
2866 int get_count() { return _numa_used_node_count; }
2867 int get_node_list_entry(int n) {
2868 // for indexes out of range, returns -1
2869 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2870 }
2871
2872 } numa_node_list_holder;
2873
2874
2875
2876 static size_t _large_page_size = 0;
2877
2878 static bool request_lock_memory_privilege() {
2879 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2880 os::current_process_id());
2881
2882 LUID luid;
2883 if (_hProcess != NULL &&
2884 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2885 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2886
2887 TOKEN_PRIVILEGES tp;
2888 tp.PrivilegeCount = 1;
2889 tp.Privileges[0].Luid = luid;
2890 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2891
2892 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2893 // privilege. Check GetLastError() too. See MSDN document.
2894 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2895 (GetLastError() == ERROR_SUCCESS)) {
2896 return true;
2897 }
2898 }
2899
2900 return false;
2901 }
2902
2903 static void cleanup_after_large_page_init() {
2904 if (_hProcess) CloseHandle(_hProcess);
2905 _hProcess = NULL;
2906 if (_hToken) CloseHandle(_hToken);
2907 _hToken = NULL;
2908 }
2909
2910 static bool numa_interleaving_init() {
2911 bool success = false;
2912 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2913
2914 // print a warning if UseNUMAInterleaving flag is specified on command line
2915 bool warn_on_failure = use_numa_interleaving_specified;
2916 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2917
2918 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2919 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2920 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2921
2922 if (numa_node_list_holder.build()) {
2923 if (log_is_enabled(Debug, os, cpu)) {
2924 Log(os, cpu) log;
2925 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2926 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2927 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2928 }
2929 }
2930 success = true;
2931 } else {
2932 WARN("Process does not cover multiple NUMA nodes.");
2933 }
2934 if (!success) {
2935 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2936 }
2937 return success;
2938 #undef WARN
2939 }
2940
2941 // this routine is used whenever we need to reserve a contiguous VA range
2942 // but we need to make separate VirtualAlloc calls for each piece of the range
2943 // Reasons for doing this:
2944 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2945 // * UseNUMAInterleaving requires a separate node for each piece
2946 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2947 DWORD prot,
2948 bool should_inject_error = false) {
2949 char * p_buf;
2950 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2951 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2952 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2953
2954 // first reserve enough address space in advance since we want to be
2955 // able to break a single contiguous virtual address range into multiple
2956 // large page commits but WS2003 does not allow reserving large page space
2957 // so we just use 4K pages for reserve, this gives us a legal contiguous
2958 // address space. then we will deallocate that reservation, and re alloc
2959 // using large pages
2960 const size_t size_of_reserve = bytes + chunk_size;
2961 if (bytes > size_of_reserve) {
2962 // Overflowed.
2963 return NULL;
2964 }
2965 p_buf = (char *) VirtualAlloc(addr,
2966 size_of_reserve, // size of Reserve
2967 MEM_RESERVE,
2968 PAGE_READWRITE);
2969 // If reservation failed, return NULL
2970 if (p_buf == NULL) return NULL;
2971 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2972 os::release_memory(p_buf, bytes + chunk_size);
2973
2974 // we still need to round up to a page boundary (in case we are using large pages)
2975 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2976 // instead we handle this in the bytes_to_rq computation below
2977 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2978
2979 // now go through and allocate one chunk at a time until all bytes are
2980 // allocated
2981 size_t bytes_remaining = bytes;
2982 // An overflow of align_size_up() would have been caught above
2983 // in the calculation of size_of_reserve.
2984 char * next_alloc_addr = p_buf;
2985 HANDLE hProc = GetCurrentProcess();
2986
2987 #ifdef ASSERT
2988 // Variable for the failure injection
2989 long ran_num = os::random();
2990 size_t fail_after = ran_num % bytes;
2991 #endif
2992
2993 int count=0;
2994 while (bytes_remaining) {
2995 // select bytes_to_rq to get to the next chunk_size boundary
2996
2997 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2998 // Note allocate and commit
2999 char * p_new;
3000
3001 #ifdef ASSERT
3002 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3003 #else
3004 const bool inject_error_now = false;
3005 #endif
3006
3007 if (inject_error_now) {
3008 p_new = NULL;
3009 } else {
3010 if (!UseNUMAInterleaving) {
3011 p_new = (char *) VirtualAlloc(next_alloc_addr,
3012 bytes_to_rq,
3013 flags,
3014 prot);
3015 } else {
3016 // get the next node to use from the used_node_list
3017 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3018 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3019 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3020 }
3021 }
3022
3023 if (p_new == NULL) {
3024 // Free any allocated pages
3025 if (next_alloc_addr > p_buf) {
3026 // Some memory was committed so release it.
3027 size_t bytes_to_release = bytes - bytes_remaining;
3028 // NMT has yet to record any individual blocks, so it
3029 // need to create a dummy 'reserve' record to match
3030 // the release.
3031 MemTracker::record_virtual_memory_reserve((address)p_buf,
3032 bytes_to_release, CALLER_PC);
3033 os::release_memory(p_buf, bytes_to_release);
3034 }
3035 #ifdef ASSERT
3036 if (should_inject_error) {
3037 log_develop_debug(pagesize)("Reserving pages individually failed.");
3038 }
3039 #endif
3040 return NULL;
3041 }
3042
3043 bytes_remaining -= bytes_to_rq;
3044 next_alloc_addr += bytes_to_rq;
3045 count++;
3046 }
3047 // Although the memory is allocated individually, it is returned as one.
3048 // NMT records it as one block.
3049 if ((flags & MEM_COMMIT) != 0) {
3050 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3051 } else {
3052 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3053 }
3054
3055 // made it this far, success
3056 return p_buf;
3057 }
3058
3059
3060
3061 void os::large_page_init() {
3062 if (!UseLargePages) return;
3063
3064 // print a warning if any large page related flag is specified on command line
3065 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3066 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3067 bool success = false;
3068
3069 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3070 if (request_lock_memory_privilege()) {
3071 size_t s = GetLargePageMinimum();
3072 if (s) {
3073 #if defined(IA32) || defined(AMD64)
3074 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3075 WARN("JVM cannot use large pages bigger than 4mb.");
3076 } else {
3077 #endif
3078 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3079 _large_page_size = LargePageSizeInBytes;
3080 } else {
3081 _large_page_size = s;
3082 }
3083 success = true;
3084 #if defined(IA32) || defined(AMD64)
3085 }
3086 #endif
3087 } else {
3088 WARN("Large page is not supported by the processor.");
3089 }
3090 } else {
3091 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3092 }
3093 #undef WARN
3094
3095 const size_t default_page_size = (size_t) vm_page_size();
3096 if (success && _large_page_size > default_page_size) {
3097 _page_sizes[0] = _large_page_size;
3098 _page_sizes[1] = default_page_size;
3099 _page_sizes[2] = 0;
3100 }
3101
3102 cleanup_after_large_page_init();
3103 UseLargePages = success;
3104 }
3105
3106 // Helper function to create a temp file in the given directory
3107 int os::create_tmpfile(const char* dir, size_t size, bool exec) {
3108
3109 char name_template[] = "/jvmheap.XXXXXX";
3110
3111 char *fullname = (char*)alloca(strlen(dir) + sizeof(name_template));
3112 (void)strcpy(fullname, dir);
3113 (void)strcat(fullname, name_template);
3114 os::native_path(fullname);
3115
3116 char *path = _mktemp(fullname);
3117 if (path == NULL)
3118 return -1;
3119
3120 int fd = _open(path, O_RDWR | O_CREAT | O_EXCL, S_IWRITE | S_IREAD);
3121
3122 if (fd < 0) {
3123 warning("Could not create file for heap");
3124 return -1;
3125 }
3126
3127 // delete the name from the filesystem. When 'fd' is closed, the file (and space) will be deleted
3128 _unlink(fullname);
3129
3130 // allocate space for the file
3131 if (_chsize(fd, (long)size) != 0) {
3132 warning("Could not allocate sufficient disk space for heap");
3133 return -1;
3134 }
3135
3136 return fd;
3137 }
3138
3139 // Map the given address range to a temporary file created at the specified directory.
3140 // The address range must already be reserved for guaranteed success. If it not reserved, their could be an error while mapping leading to JVM shutdown
3141 bool os::map_memory_to_file(char* base, size_t size, const char* backingFileDir) {
3142
3143 int fd = os::create_tmpfile(backingFileDir, size, false);
3144 if (fd == -1) {
3145 vm_exit_during_initialization(err_msg("Could not create temporary file in %s for object heap", backingFileDir));
3146 return false;
3147 }
3148
3149 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3150 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3151 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3152 if (fileMapping == NULL)
3153 return false;
3154
3155 // release the memory address range and map again at the same address
3156 pd_release_memory(base, size);
3157 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3158
3159 if (addr == NULL || addr != base) {
3160 CloseHandle(fileMapping);
3161 return false;
3162 }
3163
3164 return true;
3165 }
3166
3167 // On win32, one cannot release just a part of reserved memory, it's an
3168 // all or nothing deal. When we split a reservation, we must break the
3169 // reservation into two reservations.
3170 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3171 bool realloc) {
3172 if (size > 0) {
3173 release_memory(base, size);
3174 if (realloc) {
3175 reserve_memory(split, base);
3176 }
3177 if (size != split) {
3178 reserve_memory(size - split, base + split);
3179 }
3180 }
3181 }
3182
3183 // Multiple threads can race in this code but it's not possible to unmap small sections of
3184 // virtual space to get requested alignment, like posix-like os's.
3185 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3186 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3187 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3188 "Alignment must be a multiple of allocation granularity (page size)");
3189 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3190
3191 size_t extra_size = size + alignment;
3192 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3193
3194 char* aligned_base = NULL;
3195
3196 do {
3197 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3198 if (extra_base == NULL) {
3199 return NULL;
3200 }
3201 // Do manual alignment
3202 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3203
3204 os::release_memory(extra_base, extra_size);
3205
3206 aligned_base = os::reserve_memory(size, aligned_base);
3207
3208 } while (aligned_base == NULL);
3209
3210 return aligned_base;
3211 }
3212
3213 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3214 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3215 "reserve alignment");
3216 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3217 char* res;
3218 // note that if UseLargePages is on, all the areas that require interleaving
3219 // will go thru reserve_memory_special rather than thru here.
3220 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3221 if (!use_individual) {
3222 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3223 } else {
3224 elapsedTimer reserveTimer;
3225 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3226 // in numa interleaving, we have to allocate pages individually
3227 // (well really chunks of NUMAInterleaveGranularity size)
3228 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3229 if (res == NULL) {
3230 warning("NUMA page allocation failed");
3231 }
3232 if (Verbose && PrintMiscellaneous) {
3233 reserveTimer.stop();
3234 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3235 reserveTimer.milliseconds(), reserveTimer.ticks());
3236 }
3237 }
3238 assert(res == NULL || addr == NULL || addr == res,
3239 "Unexpected address from reserve.");
3240
3241 return res;
3242 }
3243
3244 // Reserve memory at an arbitrary address, only if that area is
3245 // available (and not reserved for something else).
3246 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3247 // Windows os::reserve_memory() fails of the requested address range is
3248 // not avilable.
3249 return reserve_memory(bytes, requested_addr);
3250 }
3251
3252 size_t os::large_page_size() {
3253 return _large_page_size;
3254 }
3255
3256 bool os::can_commit_large_page_memory() {
3257 // Windows only uses large page memory when the entire region is reserved
3258 // and committed in a single VirtualAlloc() call. This may change in the
3259 // future, but with Windows 2003 it's not possible to commit on demand.
3260 return false;
3261 }
3262
3263 bool os::can_execute_large_page_memory() {
3264 return true;
3265 }
3266
3267 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3268 bool exec) {
3269 assert(UseLargePages, "only for large pages");
3270
3271 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3272 return NULL; // Fallback to small pages.
3273 }
3274
3275 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3276 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3277
3278 // with large pages, there are two cases where we need to use Individual Allocation
3279 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3280 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3281 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3282 log_debug(pagesize)("Reserving large pages individually.");
3283
3284 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3285 if (p_buf == NULL) {
3286 // give an appropriate warning message
3287 if (UseNUMAInterleaving) {
3288 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3289 }
3290 if (UseLargePagesIndividualAllocation) {
3291 warning("Individually allocated large pages failed, "
3292 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3293 }
3294 return NULL;
3295 }
3296
3297 return p_buf;
3298
3299 } else {
3300 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3301
3302 // normal policy just allocate it all at once
3303 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3304 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3305 if (res != NULL) {
3306 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3307 }
3308
3309 return res;
3310 }
3311 }
3312
3313 bool os::release_memory_special(char* base, size_t bytes) {
3314 assert(base != NULL, "Sanity check");
3315 return release_memory(base, bytes);
3316 }
3317
3318 void os::print_statistics() {
3319 }
3320
3321 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3322 int err = os::get_last_error();
3323 char buf[256];
3324 size_t buf_len = os::lasterror(buf, sizeof(buf));
3325 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3326 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3327 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3328 }
3329
3330 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3331 if (bytes == 0) {
3332 // Don't bother the OS with noops.
3333 return true;
3334 }
3335 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3336 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3337 // Don't attempt to print anything if the OS call fails. We're
3338 // probably low on resources, so the print itself may cause crashes.
3339
3340 // unless we have NUMAInterleaving enabled, the range of a commit
3341 // is always within a reserve covered by a single VirtualAlloc
3342 // in that case we can just do a single commit for the requested size
3343 if (!UseNUMAInterleaving) {
3344 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3345 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3346 return false;
3347 }
3348 if (exec) {
3349 DWORD oldprot;
3350 // Windows doc says to use VirtualProtect to get execute permissions
3351 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3352 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3353 return false;
3354 }
3355 }
3356 return true;
3357 } else {
3358
3359 // when NUMAInterleaving is enabled, the commit might cover a range that
3360 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3361 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3362 // returns represents the number of bytes that can be committed in one step.
3363 size_t bytes_remaining = bytes;
3364 char * next_alloc_addr = addr;
3365 while (bytes_remaining > 0) {
3366 MEMORY_BASIC_INFORMATION alloc_info;
3367 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3368 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3369 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3370 PAGE_READWRITE) == NULL) {
3371 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3372 exec);)
3373 return false;
3374 }
3375 if (exec) {
3376 DWORD oldprot;
3377 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3378 PAGE_EXECUTE_READWRITE, &oldprot)) {
3379 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3380 exec);)
3381 return false;
3382 }
3383 }
3384 bytes_remaining -= bytes_to_rq;
3385 next_alloc_addr += bytes_to_rq;
3386 }
3387 }
3388 // if we made it this far, return true
3389 return true;
3390 }
3391
3392 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3393 bool exec) {
3394 // alignment_hint is ignored on this OS
3395 return pd_commit_memory(addr, size, exec);
3396 }
3397
3398 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3399 const char* mesg) {
3400 assert(mesg != NULL, "mesg must be specified");
3401 if (!pd_commit_memory(addr, size, exec)) {
3402 warn_fail_commit_memory(addr, size, exec);
3403 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3404 }
3405 }
3406
3407 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3408 size_t alignment_hint, bool exec,
3409 const char* mesg) {
3410 // alignment_hint is ignored on this OS
3411 pd_commit_memory_or_exit(addr, size, exec, mesg);
3412 }
3413
3414 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3415 if (bytes == 0) {
3416 // Don't bother the OS with noops.
3417 return true;
3418 }
3419 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3420 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3421 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3422 }
3423
3424 bool os::pd_release_memory(char* addr, size_t bytes) {
3425 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3426 }
3427
3428 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3429 return os::commit_memory(addr, size, !ExecMem);
3430 }
3431
3432 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3433 return os::uncommit_memory(addr, size);
3434 }
3435
3436 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3437 uint count = 0;
3438 bool ret = false;
3439 size_t bytes_remaining = bytes;
3440 char * next_protect_addr = addr;
3441
3442 // Use VirtualQuery() to get the chunk size.
3443 while (bytes_remaining) {
3444 MEMORY_BASIC_INFORMATION alloc_info;
3445 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3446 return false;
3447 }
3448
3449 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3450 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3451 // but we don't distinguish here as both cases are protected by same API.
3452 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3453 warning("Failed protecting pages individually for chunk #%u", count);
3454 if (!ret) {
3455 return false;
3456 }
3457
3458 bytes_remaining -= bytes_to_protect;
3459 next_protect_addr += bytes_to_protect;
3460 count++;
3461 }
3462 return ret;
3463 }
3464
3465 // Set protections specified
3466 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3467 bool is_committed) {
3468 unsigned int p = 0;
3469 switch (prot) {
3470 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3471 case MEM_PROT_READ: p = PAGE_READONLY; break;
3472 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3473 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3474 default:
3475 ShouldNotReachHere();
3476 }
3477
3478 DWORD old_status;
3479
3480 // Strange enough, but on Win32 one can change protection only for committed
3481 // memory, not a big deal anyway, as bytes less or equal than 64K
3482 if (!is_committed) {
3483 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3484 "cannot commit protection page");
3485 }
3486 // One cannot use os::guard_memory() here, as on Win32 guard page
3487 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3488 //
3489 // Pages in the region become guard pages. Any attempt to access a guard page
3490 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3491 // the guard page status. Guard pages thus act as a one-time access alarm.
3492 bool ret;
3493 if (UseNUMAInterleaving) {
3494 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3495 // so we must protect the chunks individually.
3496 ret = protect_pages_individually(addr, bytes, p, &old_status);
3497 } else {
3498 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3499 }
3500 #ifdef ASSERT
3501 if (!ret) {
3502 int err = os::get_last_error();
3503 char buf[256];
3504 size_t buf_len = os::lasterror(buf, sizeof(buf));
3505 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3506 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3507 buf_len != 0 ? buf : "<no_error_string>", err);
3508 }
3509 #endif
3510 return ret;
3511 }
3512
3513 bool os::guard_memory(char* addr, size_t bytes) {
3514 DWORD old_status;
3515 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3516 }
3517
3518 bool os::unguard_memory(char* addr, size_t bytes) {
3519 DWORD old_status;
3520 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3521 }
3522
3523 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3524 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3525 void os::numa_make_global(char *addr, size_t bytes) { }
3526 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3527 bool os::numa_topology_changed() { return false; }
3528 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3529 int os::numa_get_group_id() { return 0; }
3530 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3531 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3532 // Provide an answer for UMA systems
3533 ids[0] = 0;
3534 return 1;
3535 } else {
3536 // check for size bigger than actual groups_num
3537 size = MIN2(size, numa_get_groups_num());
3538 for (int i = 0; i < (int)size; i++) {
3539 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3540 }
3541 return size;
3542 }
3543 }
3544
3545 bool os::get_page_info(char *start, page_info* info) {
3546 return false;
3547 }
3548
3549 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3550 page_info* page_found) {
3551 return end;
3552 }
3553
3554 char* os::non_memory_address_word() {
3555 // Must never look like an address returned by reserve_memory,
3556 // even in its subfields (as defined by the CPU immediate fields,
3557 // if the CPU splits constants across multiple instructions).
3558 return (char*)-1;
3559 }
3560
3561 #define MAX_ERROR_COUNT 100
3562 #define SYS_THREAD_ERROR 0xffffffffUL
3563
3564 void os::pd_start_thread(Thread* thread) {
3565 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3566 // Returns previous suspend state:
3567 // 0: Thread was not suspended
3568 // 1: Thread is running now
3569 // >1: Thread is still suspended.
3570 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3571 }
3572
3573 class HighResolutionInterval : public CHeapObj<mtThread> {
3574 // The default timer resolution seems to be 10 milliseconds.
3575 // (Where is this written down?)
3576 // If someone wants to sleep for only a fraction of the default,
3577 // then we set the timer resolution down to 1 millisecond for
3578 // the duration of their interval.
3579 // We carefully set the resolution back, since otherwise we
3580 // seem to incur an overhead (3%?) that we don't need.
3581 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3582 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3583 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3584 // timeBeginPeriod() if the relative error exceeded some threshold.
3585 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3586 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3587 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3588 // resolution timers running.
3589 private:
3590 jlong resolution;
3591 public:
3592 HighResolutionInterval(jlong ms) {
3593 resolution = ms % 10L;
3594 if (resolution != 0) {
3595 MMRESULT result = timeBeginPeriod(1L);
3596 }
3597 }
3598 ~HighResolutionInterval() {
3599 if (resolution != 0) {
3600 MMRESULT result = timeEndPeriod(1L);
3601 }
3602 resolution = 0L;
3603 }
3604 };
3605
3606 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3607 jlong limit = (jlong) MAXDWORD;
3608
3609 while (ms > limit) {
3610 int res;
3611 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3612 return res;
3613 }
3614 ms -= limit;
3615 }
3616
3617 assert(thread == Thread::current(), "thread consistency check");
3618 OSThread* osthread = thread->osthread();
3619 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3620 int result;
3621 if (interruptable) {
3622 assert(thread->is_Java_thread(), "must be java thread");
3623 JavaThread *jt = (JavaThread *) thread;
3624 ThreadBlockInVM tbivm(jt);
3625
3626 jt->set_suspend_equivalent();
3627 // cleared by handle_special_suspend_equivalent_condition() or
3628 // java_suspend_self() via check_and_wait_while_suspended()
3629
3630 HANDLE events[1];
3631 events[0] = osthread->interrupt_event();
3632 HighResolutionInterval *phri=NULL;
3633 if (!ForceTimeHighResolution) {
3634 phri = new HighResolutionInterval(ms);
3635 }
3636 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3637 result = OS_TIMEOUT;
3638 } else {
3639 ResetEvent(osthread->interrupt_event());
3640 osthread->set_interrupted(false);
3641 result = OS_INTRPT;
3642 }
3643 delete phri; //if it is NULL, harmless
3644
3645 // were we externally suspended while we were waiting?
3646 jt->check_and_wait_while_suspended();
3647 } else {
3648 assert(!thread->is_Java_thread(), "must not be java thread");
3649 Sleep((long) ms);
3650 result = OS_TIMEOUT;
3651 }
3652 return result;
3653 }
3654
3655 // Short sleep, direct OS call.
3656 //
3657 // ms = 0, means allow others (if any) to run.
3658 //
3659 void os::naked_short_sleep(jlong ms) {
3660 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3661 Sleep(ms);
3662 }
3663
3664 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3665 void os::infinite_sleep() {
3666 while (true) { // sleep forever ...
3667 Sleep(100000); // ... 100 seconds at a time
3668 }
3669 }
3670
3671 typedef BOOL (WINAPI * STTSignature)(void);
3672
3673 void os::naked_yield() {
3674 // Consider passing back the return value from SwitchToThread().
3675 SwitchToThread();
3676 }
3677
3678 // Win32 only gives you access to seven real priorities at a time,
3679 // so we compress Java's ten down to seven. It would be better
3680 // if we dynamically adjusted relative priorities.
3681
3682 int os::java_to_os_priority[CriticalPriority + 1] = {
3683 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3684 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3685 THREAD_PRIORITY_LOWEST, // 2
3686 THREAD_PRIORITY_BELOW_NORMAL, // 3
3687 THREAD_PRIORITY_BELOW_NORMAL, // 4
3688 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3689 THREAD_PRIORITY_NORMAL, // 6
3690 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3691 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3692 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3693 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3694 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3695 };
3696
3697 int prio_policy1[CriticalPriority + 1] = {
3698 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3699 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3700 THREAD_PRIORITY_LOWEST, // 2
3701 THREAD_PRIORITY_BELOW_NORMAL, // 3
3702 THREAD_PRIORITY_BELOW_NORMAL, // 4
3703 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3704 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3705 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3706 THREAD_PRIORITY_HIGHEST, // 8
3707 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3708 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3709 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3710 };
3711
3712 static int prio_init() {
3713 // If ThreadPriorityPolicy is 1, switch tables
3714 if (ThreadPriorityPolicy == 1) {
3715 int i;
3716 for (i = 0; i < CriticalPriority + 1; i++) {
3717 os::java_to_os_priority[i] = prio_policy1[i];
3718 }
3719 }
3720 if (UseCriticalJavaThreadPriority) {
3721 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3722 }
3723 return 0;
3724 }
3725
3726 OSReturn os::set_native_priority(Thread* thread, int priority) {
3727 if (!UseThreadPriorities) return OS_OK;
3728 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3729 return ret ? OS_OK : OS_ERR;
3730 }
3731
3732 OSReturn os::get_native_priority(const Thread* const thread,
3733 int* priority_ptr) {
3734 if (!UseThreadPriorities) {
3735 *priority_ptr = java_to_os_priority[NormPriority];
3736 return OS_OK;
3737 }
3738 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3739 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3740 assert(false, "GetThreadPriority failed");
3741 return OS_ERR;
3742 }
3743 *priority_ptr = os_prio;
3744 return OS_OK;
3745 }
3746
3747
3748 // Hint to the underlying OS that a task switch would not be good.
3749 // Void return because it's a hint and can fail.
3750 void os::hint_no_preempt() {}
3751
3752 void os::interrupt(Thread* thread) {
3753 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3754 Threads_lock->owned_by_self(),
3755 "possibility of dangling Thread pointer");
3756
3757 OSThread* osthread = thread->osthread();
3758 osthread->set_interrupted(true);
3759 // More than one thread can get here with the same value of osthread,
3760 // resulting in multiple notifications. We do, however, want the store
3761 // to interrupted() to be visible to other threads before we post
3762 // the interrupt event.
3763 OrderAccess::release();
3764 SetEvent(osthread->interrupt_event());
3765 // For JSR166: unpark after setting status
3766 if (thread->is_Java_thread()) {
3767 ((JavaThread*)thread)->parker()->unpark();
3768 }
3769
3770 ParkEvent * ev = thread->_ParkEvent;
3771 if (ev != NULL) ev->unpark();
3772 }
3773
3774
3775 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3776 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3777 "possibility of dangling Thread pointer");
3778
3779 OSThread* osthread = thread->osthread();
3780 // There is no synchronization between the setting of the interrupt
3781 // and it being cleared here. It is critical - see 6535709 - that
3782 // we only clear the interrupt state, and reset the interrupt event,
3783 // if we are going to report that we were indeed interrupted - else
3784 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3785 // depending on the timing. By checking thread interrupt event to see
3786 // if the thread gets real interrupt thus prevent spurious wakeup.
3787 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3788 if (interrupted && clear_interrupted) {
3789 osthread->set_interrupted(false);
3790 ResetEvent(osthread->interrupt_event());
3791 } // Otherwise leave the interrupted state alone
3792
3793 return interrupted;
3794 }
3795
3796 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3797 ExtendedPC os::get_thread_pc(Thread* thread) {
3798 CONTEXT context;
3799 context.ContextFlags = CONTEXT_CONTROL;
3800 HANDLE handle = thread->osthread()->thread_handle();
3801 #ifdef _M_IA64
3802 assert(0, "Fix get_thread_pc");
3803 return ExtendedPC(NULL);
3804 #else
3805 if (GetThreadContext(handle, &context)) {
3806 #ifdef _M_AMD64
3807 return ExtendedPC((address) context.Rip);
3808 #else
3809 return ExtendedPC((address) context.Eip);
3810 #endif
3811 } else {
3812 return ExtendedPC(NULL);
3813 }
3814 #endif
3815 }
3816
3817 // GetCurrentThreadId() returns DWORD
3818 intx os::current_thread_id() { return GetCurrentThreadId(); }
3819
3820 static int _initial_pid = 0;
3821
3822 int os::current_process_id() {
3823 return (_initial_pid ? _initial_pid : _getpid());
3824 }
3825
3826 int os::win32::_vm_page_size = 0;
3827 int os::win32::_vm_allocation_granularity = 0;
3828 int os::win32::_processor_type = 0;
3829 // Processor level is not available on non-NT systems, use vm_version instead
3830 int os::win32::_processor_level = 0;
3831 julong os::win32::_physical_memory = 0;
3832 size_t os::win32::_default_stack_size = 0;
3833
3834 intx os::win32::_os_thread_limit = 0;
3835 volatile intx os::win32::_os_thread_count = 0;
3836
3837 bool os::win32::_is_windows_server = false;
3838
3839 // 6573254
3840 // Currently, the bug is observed across all the supported Windows releases,
3841 // including the latest one (as of this writing - Windows Server 2012 R2)
3842 bool os::win32::_has_exit_bug = true;
3843
3844 void os::win32::initialize_system_info() {
3845 SYSTEM_INFO si;
3846 GetSystemInfo(&si);
3847 _vm_page_size = si.dwPageSize;
3848 _vm_allocation_granularity = si.dwAllocationGranularity;
3849 _processor_type = si.dwProcessorType;
3850 _processor_level = si.wProcessorLevel;
3851 set_processor_count(si.dwNumberOfProcessors);
3852
3853 MEMORYSTATUSEX ms;
3854 ms.dwLength = sizeof(ms);
3855
3856 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3857 // dwMemoryLoad (% of memory in use)
3858 GlobalMemoryStatusEx(&ms);
3859 _physical_memory = ms.ullTotalPhys;
3860
3861 OSVERSIONINFOEX oi;
3862 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3863 GetVersionEx((OSVERSIONINFO*)&oi);
3864 switch (oi.dwPlatformId) {
3865 case VER_PLATFORM_WIN32_NT:
3866 {
3867 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3868 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3869 oi.wProductType == VER_NT_SERVER) {
3870 _is_windows_server = true;
3871 }
3872 }
3873 break;
3874 default: fatal("Unknown platform");
3875 }
3876
3877 _default_stack_size = os::current_stack_size();
3878 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3879 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3880 "stack size not a multiple of page size");
3881
3882 initialize_performance_counter();
3883 }
3884
3885
3886 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3887 int ebuflen) {
3888 char path[MAX_PATH];
3889 DWORD size;
3890 DWORD pathLen = (DWORD)sizeof(path);
3891 HINSTANCE result = NULL;
3892
3893 // only allow library name without path component
3894 assert(strchr(name, '\\') == NULL, "path not allowed");
3895 assert(strchr(name, ':') == NULL, "path not allowed");
3896 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3897 jio_snprintf(ebuf, ebuflen,
3898 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3899 return NULL;
3900 }
3901
3902 // search system directory
3903 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3904 if (size >= pathLen) {
3905 return NULL; // truncated
3906 }
3907 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3908 return NULL; // truncated
3909 }
3910 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3911 return result;
3912 }
3913 }
3914
3915 // try Windows directory
3916 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3917 if (size >= pathLen) {
3918 return NULL; // truncated
3919 }
3920 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3921 return NULL; // truncated
3922 }
3923 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3924 return result;
3925 }
3926 }
3927
3928 jio_snprintf(ebuf, ebuflen,
3929 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3930 return NULL;
3931 }
3932
3933 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3934 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3935
3936 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3937 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3938 return TRUE;
3939 }
3940
3941 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3942 // Basic approach:
3943 // - Each exiting thread registers its intent to exit and then does so.
3944 // - A thread trying to terminate the process must wait for all
3945 // threads currently exiting to complete their exit.
3946
3947 if (os::win32::has_exit_bug()) {
3948 // The array holds handles of the threads that have started exiting by calling
3949 // _endthreadex().
3950 // Should be large enough to avoid blocking the exiting thread due to lack of
3951 // a free slot.
3952 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3953 static int handle_count = 0;
3954
3955 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3956 static CRITICAL_SECTION crit_sect;
3957 static volatile jint process_exiting = 0;
3958 int i, j;
3959 DWORD res;
3960 HANDLE hproc, hthr;
3961
3962 // The first thread that reached this point, initializes the critical section.
3963 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3964 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3965 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3966 if (what != EPT_THREAD) {
3967 // Atomically set process_exiting before the critical section
3968 // to increase the visibility between racing threads.
3969 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3970 }
3971 EnterCriticalSection(&crit_sect);
3972
3973 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3974 // Remove from the array those handles of the threads that have completed exiting.
3975 for (i = 0, j = 0; i < handle_count; ++i) {
3976 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3977 if (res == WAIT_TIMEOUT) {
3978 handles[j++] = handles[i];
3979 } else {
3980 if (res == WAIT_FAILED) {
3981 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3982 GetLastError(), __FILE__, __LINE__);
3983 }
3984 // Don't keep the handle, if we failed waiting for it.
3985 CloseHandle(handles[i]);
3986 }
3987 }
3988
3989 // If there's no free slot in the array of the kept handles, we'll have to
3990 // wait until at least one thread completes exiting.
3991 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3992 // Raise the priority of the oldest exiting thread to increase its chances
3993 // to complete sooner.
3994 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3995 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3996 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3997 i = (res - WAIT_OBJECT_0);
3998 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3999 for (; i < handle_count; ++i) {
4000 handles[i] = handles[i + 1];
4001 }
4002 } else {
4003 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4004 (res == WAIT_FAILED ? "failed" : "timed out"),
4005 GetLastError(), __FILE__, __LINE__);
4006 // Don't keep handles, if we failed waiting for them.
4007 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
4008 CloseHandle(handles[i]);
4009 }
4010 handle_count = 0;
4011 }
4012 }
4013
4014 // Store a duplicate of the current thread handle in the array of handles.
4015 hproc = GetCurrentProcess();
4016 hthr = GetCurrentThread();
4017 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
4018 0, FALSE, DUPLICATE_SAME_ACCESS)) {
4019 warning("DuplicateHandle failed (%u) in %s: %d\n",
4020 GetLastError(), __FILE__, __LINE__);
4021 } else {
4022 ++handle_count;
4023 }
4024
4025 // The current exiting thread has stored its handle in the array, and now
4026 // should leave the critical section before calling _endthreadex().
4027
4028 } else if (what != EPT_THREAD && handle_count > 0) {
4029 jlong start_time, finish_time, timeout_left;
4030 // Before ending the process, make sure all the threads that had called
4031 // _endthreadex() completed.
4032
4033 // Set the priority level of the current thread to the same value as
4034 // the priority level of exiting threads.
4035 // This is to ensure it will be given a fair chance to execute if
4036 // the timeout expires.
4037 hthr = GetCurrentThread();
4038 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
4039 start_time = os::javaTimeNanos();
4040 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
4041 for (i = 0; ; ) {
4042 int portion_count = handle_count - i;
4043 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
4044 portion_count = MAXIMUM_WAIT_OBJECTS;
4045 }
4046 for (j = 0; j < portion_count; ++j) {
4047 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4048 }
4049 timeout_left = (finish_time - start_time) / 1000000L;
4050 if (timeout_left < 0) {
4051 timeout_left = 0;
4052 }
4053 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4054 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4055 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4056 (res == WAIT_FAILED ? "failed" : "timed out"),
4057 GetLastError(), __FILE__, __LINE__);
4058 // Reset portion_count so we close the remaining
4059 // handles due to this error.
4060 portion_count = handle_count - i;
4061 }
4062 for (j = 0; j < portion_count; ++j) {
4063 CloseHandle(handles[i + j]);
4064 }
4065 if ((i += portion_count) >= handle_count) {
4066 break;
4067 }
4068 start_time = os::javaTimeNanos();
4069 }
4070 handle_count = 0;
4071 }
4072
4073 LeaveCriticalSection(&crit_sect);
4074 }
4075
4076 if (OrderAccess::load_acquire(&process_exiting) != 0 &&
4077 process_exiting != (jint)GetCurrentThreadId()) {
4078 // Some other thread is about to call exit(), so we
4079 // don't let the current thread proceed to exit() or _endthreadex()
4080 while (true) {
4081 SuspendThread(GetCurrentThread());
4082 // Avoid busy-wait loop, if SuspendThread() failed.
4083 Sleep(EXIT_TIMEOUT);
4084 }
4085 }
4086 }
4087
4088 // We are here if either
4089 // - there's no 'race at exit' bug on this OS release;
4090 // - initialization of the critical section failed (unlikely);
4091 // - the current thread has stored its handle and left the critical section;
4092 // - the process-exiting thread has raised the flag and left the critical section.
4093 if (what == EPT_THREAD) {
4094 _endthreadex((unsigned)exit_code);
4095 } else if (what == EPT_PROCESS) {
4096 ::exit(exit_code);
4097 } else {
4098 _exit(exit_code);
4099 }
4100
4101 // Should not reach here
4102 return exit_code;
4103 }
4104
4105 #undef EXIT_TIMEOUT
4106
4107 void os::win32::setmode_streams() {
4108 _setmode(_fileno(stdin), _O_BINARY);
4109 _setmode(_fileno(stdout), _O_BINARY);
4110 _setmode(_fileno(stderr), _O_BINARY);
4111 }
4112
4113
4114 bool os::is_debugger_attached() {
4115 return IsDebuggerPresent() ? true : false;
4116 }
4117
4118
4119 void os::wait_for_keypress_at_exit(void) {
4120 if (PauseAtExit) {
4121 fprintf(stderr, "Press any key to continue...\n");
4122 fgetc(stdin);
4123 }
4124 }
4125
4126
4127 bool os::message_box(const char* title, const char* message) {
4128 int result = MessageBox(NULL, message, title,
4129 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4130 return result == IDYES;
4131 }
4132
4133 #ifndef PRODUCT
4134 #ifndef _WIN64
4135 // Helpers to check whether NX protection is enabled
4136 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4137 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4138 pex->ExceptionRecord->NumberParameters > 0 &&
4139 pex->ExceptionRecord->ExceptionInformation[0] ==
4140 EXCEPTION_INFO_EXEC_VIOLATION) {
4141 return EXCEPTION_EXECUTE_HANDLER;
4142 }
4143 return EXCEPTION_CONTINUE_SEARCH;
4144 }
4145
4146 void nx_check_protection() {
4147 // If NX is enabled we'll get an exception calling into code on the stack
4148 char code[] = { (char)0xC3 }; // ret
4149 void *code_ptr = (void *)code;
4150 __try {
4151 __asm call code_ptr
4152 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4153 tty->print_raw_cr("NX protection detected.");
4154 }
4155 }
4156 #endif // _WIN64
4157 #endif // PRODUCT
4158
4159 // This is called _before_ the global arguments have been parsed
4160 void os::init(void) {
4161 _initial_pid = _getpid();
4162
4163 init_random(1234567);
4164
4165 win32::initialize_system_info();
4166 win32::setmode_streams();
4167 init_page_sizes((size_t) win32::vm_page_size());
4168
4169 // This may be overridden later when argument processing is done.
4170 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4171
4172 // Initialize main_process and main_thread
4173 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4174 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4175 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4176 fatal("DuplicateHandle failed\n");
4177 }
4178 main_thread_id = (int) GetCurrentThreadId();
4179
4180 // initialize fast thread access - only used for 32-bit
4181 win32::initialize_thread_ptr_offset();
4182 }
4183
4184 // To install functions for atexit processing
4185 extern "C" {
4186 static void perfMemory_exit_helper() {
4187 perfMemory_exit();
4188 }
4189 }
4190
4191 static jint initSock();
4192
4193 // this is called _after_ the global arguments have been parsed
4194 jint os::init_2(void) {
4195 // Allocate a single page and mark it as readable for safepoint polling
4196 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4197 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4198
4199 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4200 guarantee(return_page != NULL, "Commit Failed for polling page");
4201
4202 os::set_polling_page(polling_page);
4203 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4204
4205 if (!UseMembar) {
4206 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4207 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4208
4209 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4210 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4211
4212 os::set_memory_serialize_page(mem_serialize_page);
4213 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4214 }
4215
4216 // Setup Windows Exceptions
4217
4218 // for debugging float code generation bugs
4219 if (ForceFloatExceptions) {
4220 #ifndef _WIN64
4221 static long fp_control_word = 0;
4222 __asm { fstcw fp_control_word }
4223 // see Intel PPro Manual, Vol. 2, p 7-16
4224 const long precision = 0x20;
4225 const long underflow = 0x10;
4226 const long overflow = 0x08;
4227 const long zero_div = 0x04;
4228 const long denorm = 0x02;
4229 const long invalid = 0x01;
4230 fp_control_word |= invalid;
4231 __asm { fldcw fp_control_word }
4232 #endif
4233 }
4234
4235 // If stack_commit_size is 0, windows will reserve the default size,
4236 // but only commit a small portion of it.
4237 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4238 size_t default_reserve_size = os::win32::default_stack_size();
4239 size_t actual_reserve_size = stack_commit_size;
4240 if (stack_commit_size < default_reserve_size) {
4241 // If stack_commit_size == 0, we want this too
4242 actual_reserve_size = default_reserve_size;
4243 }
4244
4245 // Check minimum allowable stack size for thread creation and to initialize
4246 // the java system classes, including StackOverflowError - depends on page
4247 // size. Add a page for compiler2 recursion in main thread.
4248 // Add in 2*BytesPerWord times page size to account for VM stack during
4249 // class initialization depending on 32 or 64 bit VM.
4250 size_t min_stack_allowed =
4251 (size_t)(JavaThread::stack_yellow_zone_size() + JavaThread::stack_red_zone_size() +
4252 JavaThread::stack_shadow_zone_size() +
4253 (2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size());
4254 if (actual_reserve_size < min_stack_allowed) {
4255 tty->print_cr("\nThe stack size specified is too small, "
4256 "Specify at least %dk",
4257 min_stack_allowed / K);
4258 return JNI_ERR;
4259 }
4260
4261 JavaThread::set_stack_size_at_create(stack_commit_size);
4262
4263 // Calculate theoretical max. size of Threads to guard gainst artifical
4264 // out-of-memory situations, where all available address-space has been
4265 // reserved by thread stacks.
4266 assert(actual_reserve_size != 0, "Must have a stack");
4267
4268 // Calculate the thread limit when we should start doing Virtual Memory
4269 // banging. Currently when the threads will have used all but 200Mb of space.
4270 //
4271 // TODO: consider performing a similar calculation for commit size instead
4272 // as reserve size, since on a 64-bit platform we'll run into that more
4273 // often than running out of virtual memory space. We can use the
4274 // lower value of the two calculations as the os_thread_limit.
4275 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4276 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4277
4278 // at exit methods are called in the reverse order of their registration.
4279 // there is no limit to the number of functions registered. atexit does
4280 // not set errno.
4281
4282 if (PerfAllowAtExitRegistration) {
4283 // only register atexit functions if PerfAllowAtExitRegistration is set.
4284 // atexit functions can be delayed until process exit time, which
4285 // can be problematic for embedded VM situations. Embedded VMs should
4286 // call DestroyJavaVM() to assure that VM resources are released.
4287
4288 // note: perfMemory_exit_helper atexit function may be removed in
4289 // the future if the appropriate cleanup code can be added to the
4290 // VM_Exit VMOperation's doit method.
4291 if (atexit(perfMemory_exit_helper) != 0) {
4292 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4293 }
4294 }
4295
4296 #ifndef _WIN64
4297 // Print something if NX is enabled (win32 on AMD64)
4298 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4299 #endif
4300
4301 // initialize thread priority policy
4302 prio_init();
4303
4304 if (UseNUMA && !ForceNUMA) {
4305 UseNUMA = false; // We don't fully support this yet
4306 }
4307
4308 if (UseNUMAInterleaving) {
4309 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4310 bool success = numa_interleaving_init();
4311 if (!success) UseNUMAInterleaving = false;
4312 }
4313
4314 if (initSock() != JNI_OK) {
4315 return JNI_ERR;
4316 }
4317
4318 return JNI_OK;
4319 }
4320
4321 // Mark the polling page as unreadable
4322 void os::make_polling_page_unreadable(void) {
4323 DWORD old_status;
4324 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4325 PAGE_NOACCESS, &old_status)) {
4326 fatal("Could not disable polling page");
4327 }
4328 }
4329
4330 // Mark the polling page as readable
4331 void os::make_polling_page_readable(void) {
4332 DWORD old_status;
4333 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4334 PAGE_READONLY, &old_status)) {
4335 fatal("Could not enable polling page");
4336 }
4337 }
4338
4339
4340 int os::stat(const char *path, struct stat *sbuf) {
4341 char pathbuf[MAX_PATH];
4342 if (strlen(path) > MAX_PATH - 1) {
4343 errno = ENAMETOOLONG;
4344 return -1;
4345 }
4346 os::native_path(strcpy(pathbuf, path));
4347 int ret = ::stat(pathbuf, sbuf);
4348 if (sbuf != NULL && UseUTCFileTimestamp) {
4349 // Fix for 6539723. st_mtime returned from stat() is dependent on
4350 // the system timezone and so can return different values for the
4351 // same file if/when daylight savings time changes. This adjustment
4352 // makes sure the same timestamp is returned regardless of the TZ.
4353 //
4354 // See:
4355 // http://msdn.microsoft.com/library/
4356 // default.asp?url=/library/en-us/sysinfo/base/
4357 // time_zone_information_str.asp
4358 // and
4359 // http://msdn.microsoft.com/library/default.asp?url=
4360 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4361 //
4362 // NOTE: there is a insidious bug here: If the timezone is changed
4363 // after the call to stat() but before 'GetTimeZoneInformation()', then
4364 // the adjustment we do here will be wrong and we'll return the wrong
4365 // value (which will likely end up creating an invalid class data
4366 // archive). Absent a better API for this, or some time zone locking
4367 // mechanism, we'll have to live with this risk.
4368 TIME_ZONE_INFORMATION tz;
4369 DWORD tzid = GetTimeZoneInformation(&tz);
4370 int daylightBias =
4371 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4372 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4373 }
4374 return ret;
4375 }
4376
4377
4378 #define FT2INT64(ft) \
4379 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4380
4381
4382 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4383 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4384 // of a thread.
4385 //
4386 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4387 // the fast estimate available on the platform.
4388
4389 // current_thread_cpu_time() is not optimized for Windows yet
4390 jlong os::current_thread_cpu_time() {
4391 // return user + sys since the cost is the same
4392 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4393 }
4394
4395 jlong os::thread_cpu_time(Thread* thread) {
4396 // consistent with what current_thread_cpu_time() returns.
4397 return os::thread_cpu_time(thread, true /* user+sys */);
4398 }
4399
4400 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4401 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4402 }
4403
4404 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4405 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4406 // If this function changes, os::is_thread_cpu_time_supported() should too
4407 FILETIME CreationTime;
4408 FILETIME ExitTime;
4409 FILETIME KernelTime;
4410 FILETIME UserTime;
4411
4412 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4413 &ExitTime, &KernelTime, &UserTime) == 0) {
4414 return -1;
4415 } else if (user_sys_cpu_time) {
4416 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4417 } else {
4418 return FT2INT64(UserTime) * 100;
4419 }
4420 }
4421
4422 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4423 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4424 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4425 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4426 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4427 }
4428
4429 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4430 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4431 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4432 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4433 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4434 }
4435
4436 bool os::is_thread_cpu_time_supported() {
4437 // see os::thread_cpu_time
4438 FILETIME CreationTime;
4439 FILETIME ExitTime;
4440 FILETIME KernelTime;
4441 FILETIME UserTime;
4442
4443 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4444 &KernelTime, &UserTime) == 0) {
4445 return false;
4446 } else {
4447 return true;
4448 }
4449 }
4450
4451 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4452 // It does have primitives (PDH API) to get CPU usage and run queue length.
4453 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4454 // If we wanted to implement loadavg on Windows, we have a few options:
4455 //
4456 // a) Query CPU usage and run queue length and "fake" an answer by
4457 // returning the CPU usage if it's under 100%, and the run queue
4458 // length otherwise. It turns out that querying is pretty slow
4459 // on Windows, on the order of 200 microseconds on a fast machine.
4460 // Note that on the Windows the CPU usage value is the % usage
4461 // since the last time the API was called (and the first call
4462 // returns 100%), so we'd have to deal with that as well.
4463 //
4464 // b) Sample the "fake" answer using a sampling thread and store
4465 // the answer in a global variable. The call to loadavg would
4466 // just return the value of the global, avoiding the slow query.
4467 //
4468 // c) Sample a better answer using exponential decay to smooth the
4469 // value. This is basically the algorithm used by UNIX kernels.
4470 //
4471 // Note that sampling thread starvation could affect both (b) and (c).
4472 int os::loadavg(double loadavg[], int nelem) {
4473 return -1;
4474 }
4475
4476
4477 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4478 bool os::dont_yield() {
4479 return DontYieldALot;
4480 }
4481
4482 // This method is a slightly reworked copy of JDK's sysOpen
4483 // from src/windows/hpi/src/sys_api_md.c
4484
4485 int os::open(const char *path, int oflag, int mode) {
4486 char pathbuf[MAX_PATH];
4487
4488 if (strlen(path) > MAX_PATH - 1) {
4489 errno = ENAMETOOLONG;
4490 return -1;
4491 }
4492 os::native_path(strcpy(pathbuf, path));
4493 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4494 }
4495
4496 FILE* os::open(int fd, const char* mode) {
4497 return ::_fdopen(fd, mode);
4498 }
4499
4500 // Is a (classpath) directory empty?
4501 bool os::dir_is_empty(const char* path) {
4502 WIN32_FIND_DATA fd;
4503 HANDLE f = FindFirstFile(path, &fd);
4504 if (f == INVALID_HANDLE_VALUE) {
4505 return true;
4506 }
4507 FindClose(f);
4508 return false;
4509 }
4510
4511 // create binary file, rewriting existing file if required
4512 int os::create_binary_file(const char* path, bool rewrite_existing) {
4513 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4514 if (!rewrite_existing) {
4515 oflags |= _O_EXCL;
4516 }
4517 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4518 }
4519
4520 // return current position of file pointer
4521 jlong os::current_file_offset(int fd) {
4522 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4523 }
4524
4525 // move file pointer to the specified offset
4526 jlong os::seek_to_file_offset(int fd, jlong offset) {
4527 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4528 }
4529
4530
4531 jlong os::lseek(int fd, jlong offset, int whence) {
4532 return (jlong) ::_lseeki64(fd, offset, whence);
4533 }
4534
4535 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4536 OVERLAPPED ov;
4537 DWORD nread;
4538 BOOL result;
4539
4540 ZeroMemory(&ov, sizeof(ov));
4541 ov.Offset = (DWORD)offset;
4542 ov.OffsetHigh = (DWORD)(offset >> 32);
4543
4544 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4545
4546 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4547
4548 return result ? nread : 0;
4549 }
4550
4551
4552 // This method is a slightly reworked copy of JDK's sysNativePath
4553 // from src/windows/hpi/src/path_md.c
4554
4555 // Convert a pathname to native format. On win32, this involves forcing all
4556 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4557 // sometimes rejects '/') and removing redundant separators. The input path is
4558 // assumed to have been converted into the character encoding used by the local
4559 // system. Because this might be a double-byte encoding, care is taken to
4560 // treat double-byte lead characters correctly.
4561 //
4562 // This procedure modifies the given path in place, as the result is never
4563 // longer than the original. There is no error return; this operation always
4564 // succeeds.
4565 char * os::native_path(char *path) {
4566 char *src = path, *dst = path, *end = path;
4567 char *colon = NULL; // If a drive specifier is found, this will
4568 // point to the colon following the drive letter
4569
4570 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4571 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4572 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4573
4574 // Check for leading separators
4575 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4576 while (isfilesep(*src)) {
4577 src++;
4578 }
4579
4580 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4581 // Remove leading separators if followed by drive specifier. This
4582 // hack is necessary to support file URLs containing drive
4583 // specifiers (e.g., "file://c:/path"). As a side effect,
4584 // "/c:/path" can be used as an alternative to "c:/path".
4585 *dst++ = *src++;
4586 colon = dst;
4587 *dst++ = ':';
4588 src++;
4589 } else {
4590 src = path;
4591 if (isfilesep(src[0]) && isfilesep(src[1])) {
4592 // UNC pathname: Retain first separator; leave src pointed at
4593 // second separator so that further separators will be collapsed
4594 // into the second separator. The result will be a pathname
4595 // beginning with "\\\\" followed (most likely) by a host name.
4596 src = dst = path + 1;
4597 path[0] = '\\'; // Force first separator to '\\'
4598 }
4599 }
4600
4601 end = dst;
4602
4603 // Remove redundant separators from remainder of path, forcing all
4604 // separators to be '\\' rather than '/'. Also, single byte space
4605 // characters are removed from the end of the path because those
4606 // are not legal ending characters on this operating system.
4607 //
4608 while (*src != '\0') {
4609 if (isfilesep(*src)) {
4610 *dst++ = '\\'; src++;
4611 while (isfilesep(*src)) src++;
4612 if (*src == '\0') {
4613 // Check for trailing separator
4614 end = dst;
4615 if (colon == dst - 2) break; // "z:\\"
4616 if (dst == path + 1) break; // "\\"
4617 if (dst == path + 2 && isfilesep(path[0])) {
4618 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4619 // beginning of a UNC pathname. Even though it is not, by
4620 // itself, a valid UNC pathname, we leave it as is in order
4621 // to be consistent with the path canonicalizer as well
4622 // as the win32 APIs, which treat this case as an invalid
4623 // UNC pathname rather than as an alias for the root
4624 // directory of the current drive.
4625 break;
4626 }
4627 end = --dst; // Path does not denote a root directory, so
4628 // remove trailing separator
4629 break;
4630 }
4631 end = dst;
4632 } else {
4633 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4634 *dst++ = *src++;
4635 if (*src) *dst++ = *src++;
4636 end = dst;
4637 } else { // Copy a single-byte character
4638 char c = *src++;
4639 *dst++ = c;
4640 // Space is not a legal ending character
4641 if (c != ' ') end = dst;
4642 }
4643 }
4644 }
4645
4646 *end = '\0';
4647
4648 // For "z:", add "." to work around a bug in the C runtime library
4649 if (colon == dst - 1) {
4650 path[2] = '.';
4651 path[3] = '\0';
4652 }
4653
4654 return path;
4655 }
4656
4657 // This code is a copy of JDK's sysSetLength
4658 // from src/windows/hpi/src/sys_api_md.c
4659
4660 int os::ftruncate(int fd, jlong length) {
4661 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4662 long high = (long)(length >> 32);
4663 DWORD ret;
4664
4665 if (h == (HANDLE)(-1)) {
4666 return -1;
4667 }
4668
4669 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4670 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4671 return -1;
4672 }
4673
4674 if (::SetEndOfFile(h) == FALSE) {
4675 return -1;
4676 }
4677
4678 return 0;
4679 }
4680
4681 int os::get_fileno(FILE* fp) {
4682 return _fileno(fp);
4683 }
4684
4685 // This code is a copy of JDK's sysSync
4686 // from src/windows/hpi/src/sys_api_md.c
4687 // except for the legacy workaround for a bug in Win 98
4688
4689 int os::fsync(int fd) {
4690 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4691
4692 if ((!::FlushFileBuffers(handle)) &&
4693 (GetLastError() != ERROR_ACCESS_DENIED)) {
4694 // from winerror.h
4695 return -1;
4696 }
4697 return 0;
4698 }
4699
4700 static int nonSeekAvailable(int, long *);
4701 static int stdinAvailable(int, long *);
4702
4703 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4704 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4705
4706 // This code is a copy of JDK's sysAvailable
4707 // from src/windows/hpi/src/sys_api_md.c
4708
4709 int os::available(int fd, jlong *bytes) {
4710 jlong cur, end;
4711 struct _stati64 stbuf64;
4712
4713 if (::_fstati64(fd, &stbuf64) >= 0) {
4714 int mode = stbuf64.st_mode;
4715 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4716 int ret;
4717 long lpbytes;
4718 if (fd == 0) {
4719 ret = stdinAvailable(fd, &lpbytes);
4720 } else {
4721 ret = nonSeekAvailable(fd, &lpbytes);
4722 }
4723 (*bytes) = (jlong)(lpbytes);
4724 return ret;
4725 }
4726 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4727 return FALSE;
4728 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4729 return FALSE;
4730 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4731 return FALSE;
4732 }
4733 *bytes = end - cur;
4734 return TRUE;
4735 } else {
4736 return FALSE;
4737 }
4738 }
4739
4740 void os::flockfile(FILE* fp) {
4741 _lock_file(fp);
4742 }
4743
4744 void os::funlockfile(FILE* fp) {
4745 _unlock_file(fp);
4746 }
4747
4748 // This code is a copy of JDK's nonSeekAvailable
4749 // from src/windows/hpi/src/sys_api_md.c
4750
4751 static int nonSeekAvailable(int fd, long *pbytes) {
4752 // This is used for available on non-seekable devices
4753 // (like both named and anonymous pipes, such as pipes
4754 // connected to an exec'd process).
4755 // Standard Input is a special case.
4756 HANDLE han;
4757
4758 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4759 return FALSE;
4760 }
4761
4762 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4763 // PeekNamedPipe fails when at EOF. In that case we
4764 // simply make *pbytes = 0 which is consistent with the
4765 // behavior we get on Solaris when an fd is at EOF.
4766 // The only alternative is to raise an Exception,
4767 // which isn't really warranted.
4768 //
4769 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4770 return FALSE;
4771 }
4772 *pbytes = 0;
4773 }
4774 return TRUE;
4775 }
4776
4777 #define MAX_INPUT_EVENTS 2000
4778
4779 // This code is a copy of JDK's stdinAvailable
4780 // from src/windows/hpi/src/sys_api_md.c
4781
4782 static int stdinAvailable(int fd, long *pbytes) {
4783 HANDLE han;
4784 DWORD numEventsRead = 0; // Number of events read from buffer
4785 DWORD numEvents = 0; // Number of events in buffer
4786 DWORD i = 0; // Loop index
4787 DWORD curLength = 0; // Position marker
4788 DWORD actualLength = 0; // Number of bytes readable
4789 BOOL error = FALSE; // Error holder
4790 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4791
4792 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4793 return FALSE;
4794 }
4795
4796 // Construct an array of input records in the console buffer
4797 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4798 if (error == 0) {
4799 return nonSeekAvailable(fd, pbytes);
4800 }
4801
4802 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4803 if (numEvents > MAX_INPUT_EVENTS) {
4804 numEvents = MAX_INPUT_EVENTS;
4805 }
4806
4807 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4808 if (lpBuffer == NULL) {
4809 return FALSE;
4810 }
4811
4812 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4813 if (error == 0) {
4814 os::free(lpBuffer);
4815 return FALSE;
4816 }
4817
4818 // Examine input records for the number of bytes available
4819 for (i=0; i<numEvents; i++) {
4820 if (lpBuffer[i].EventType == KEY_EVENT) {
4821
4822 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4823 &(lpBuffer[i].Event);
4824 if (keyRecord->bKeyDown == TRUE) {
4825 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4826 curLength++;
4827 if (*keyPressed == '\r') {
4828 actualLength = curLength;
4829 }
4830 }
4831 }
4832 }
4833
4834 if (lpBuffer != NULL) {
4835 os::free(lpBuffer);
4836 }
4837
4838 *pbytes = (long) actualLength;
4839 return TRUE;
4840 }
4841
4842 // Map a block of memory.
4843 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4844 char *addr, size_t bytes, bool read_only,
4845 bool allow_exec) {
4846 HANDLE hFile;
4847 char* base;
4848
4849 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4850 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4851 if (hFile == NULL) {
4852 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4853 return NULL;
4854 }
4855
4856 if (allow_exec) {
4857 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4858 // unless it comes from a PE image (which the shared archive is not.)
4859 // Even VirtualProtect refuses to give execute access to mapped memory
4860 // that was not previously executable.
4861 //
4862 // Instead, stick the executable region in anonymous memory. Yuck.
4863 // Penalty is that ~4 pages will not be shareable - in the future
4864 // we might consider DLLizing the shared archive with a proper PE
4865 // header so that mapping executable + sharing is possible.
4866
4867 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4868 PAGE_READWRITE);
4869 if (base == NULL) {
4870 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4871 CloseHandle(hFile);
4872 return NULL;
4873 }
4874
4875 DWORD bytes_read;
4876 OVERLAPPED overlapped;
4877 overlapped.Offset = (DWORD)file_offset;
4878 overlapped.OffsetHigh = 0;
4879 overlapped.hEvent = NULL;
4880 // ReadFile guarantees that if the return value is true, the requested
4881 // number of bytes were read before returning.
4882 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4883 if (!res) {
4884 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4885 release_memory(base, bytes);
4886 CloseHandle(hFile);
4887 return NULL;
4888 }
4889 } else {
4890 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4891 NULL /* file_name */);
4892 if (hMap == NULL) {
4893 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4894 CloseHandle(hFile);
4895 return NULL;
4896 }
4897
4898 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4899 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4900 (DWORD)bytes, addr);
4901 if (base == NULL) {
4902 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4903 CloseHandle(hMap);
4904 CloseHandle(hFile);
4905 return NULL;
4906 }
4907
4908 if (CloseHandle(hMap) == 0) {
4909 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4910 CloseHandle(hFile);
4911 return base;
4912 }
4913 }
4914
4915 if (allow_exec) {
4916 DWORD old_protect;
4917 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4918 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4919
4920 if (!res) {
4921 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4922 // Don't consider this a hard error, on IA32 even if the
4923 // VirtualProtect fails, we should still be able to execute
4924 CloseHandle(hFile);
4925 return base;
4926 }
4927 }
4928
4929 if (CloseHandle(hFile) == 0) {
4930 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4931 return base;
4932 }
4933
4934 return base;
4935 }
4936
4937
4938 // Remap a block of memory.
4939 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4940 char *addr, size_t bytes, bool read_only,
4941 bool allow_exec) {
4942 // This OS does not allow existing memory maps to be remapped so we
4943 // have to unmap the memory before we remap it.
4944 if (!os::unmap_memory(addr, bytes)) {
4945 return NULL;
4946 }
4947
4948 // There is a very small theoretical window between the unmap_memory()
4949 // call above and the map_memory() call below where a thread in native
4950 // code may be able to access an address that is no longer mapped.
4951
4952 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4953 read_only, allow_exec);
4954 }
4955
4956
4957 // Unmap a block of memory.
4958 // Returns true=success, otherwise false.
4959
4960 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4961 MEMORY_BASIC_INFORMATION mem_info;
4962 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4963 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4964 return false;
4965 }
4966
4967 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4968 // Instead, executable region was allocated using VirtualAlloc(). See
4969 // pd_map_memory() above.
4970 //
4971 // The following flags should match the 'exec_access' flages used for
4972 // VirtualProtect() in pd_map_memory().
4973 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4974 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4975 return pd_release_memory(addr, bytes);
4976 }
4977
4978 BOOL result = UnmapViewOfFile(addr);
4979 if (result == 0) {
4980 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4981 return false;
4982 }
4983 return true;
4984 }
4985
4986 void os::pause() {
4987 char filename[MAX_PATH];
4988 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4989 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4990 } else {
4991 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4992 }
4993
4994 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4995 if (fd != -1) {
4996 struct stat buf;
4997 ::close(fd);
4998 while (::stat(filename, &buf) == 0) {
4999 Sleep(100);
5000 }
5001 } else {
5002 jio_fprintf(stderr,
5003 "Could not open pause file '%s', continuing immediately.\n", filename);
5004 }
5005 }
5006
5007 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
5008 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
5009 }
5010
5011 // See the caveats for this class in os_windows.hpp
5012 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5013 // into this method and returns false. If no OS EXCEPTION was raised, returns
5014 // true.
5015 // The callback is supposed to provide the method that should be protected.
5016 //
5017 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5018 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
5019 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
5020 "crash_protection already set?");
5021
5022 bool success = true;
5023 __try {
5024 WatcherThread::watcher_thread()->set_crash_protection(this);
5025 cb.call();
5026 } __except(EXCEPTION_EXECUTE_HANDLER) {
5027 // only for protection, nothing to do
5028 success = false;
5029 }
5030 WatcherThread::watcher_thread()->set_crash_protection(NULL);
5031 return success;
5032 }
5033
5034 // An Event wraps a win32 "CreateEvent" kernel handle.
5035 //
5036 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5037 //
5038 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5039 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5040 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5041 // In addition, an unpark() operation might fetch the handle field, but the
5042 // event could recycle between the fetch and the SetEvent() operation.
5043 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5044 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5045 // on an stale but recycled handle would be harmless, but in practice this might
5046 // confuse other non-Sun code, so it's not a viable approach.
5047 //
5048 // 2: Once a win32 event handle is associated with an Event, it remains associated
5049 // with the Event. The event handle is never closed. This could be construed
5050 // as handle leakage, but only up to the maximum # of threads that have been extant
5051 // at any one time. This shouldn't be an issue, as windows platforms typically
5052 // permit a process to have hundreds of thousands of open handles.
5053 //
5054 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5055 // and release unused handles.
5056 //
5057 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5058 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5059 //
5060 // 5. Use an RCU-like mechanism (Read-Copy Update).
5061 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5062 //
5063 // We use (2).
5064 //
5065 // TODO-FIXME:
5066 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5067 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5068 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5069 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5070 // into a single win32 CreateEvent() handle.
5071 //
5072 // Assumption:
5073 // Only one parker can exist on an event, which is why we allocate
5074 // them per-thread. Multiple unparkers can coexist.
5075 //
5076 // _Event transitions in park()
5077 // -1 => -1 : illegal
5078 // 1 => 0 : pass - return immediately
5079 // 0 => -1 : block; then set _Event to 0 before returning
5080 //
5081 // _Event transitions in unpark()
5082 // 0 => 1 : just return
5083 // 1 => 1 : just return
5084 // -1 => either 0 or 1; must signal target thread
5085 // That is, we can safely transition _Event from -1 to either
5086 // 0 or 1.
5087 //
5088 // _Event serves as a restricted-range semaphore.
5089 // -1 : thread is blocked, i.e. there is a waiter
5090 // 0 : neutral: thread is running or ready,
5091 // could have been signaled after a wait started
5092 // 1 : signaled - thread is running or ready
5093 //
5094 // Another possible encoding of _Event would be with
5095 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5096 //
5097
5098 int os::PlatformEvent::park(jlong Millis) {
5099 // Transitions for _Event:
5100 // -1 => -1 : illegal
5101 // 1 => 0 : pass - return immediately
5102 // 0 => -1 : block; then set _Event to 0 before returning
5103
5104 guarantee(_ParkHandle != NULL , "Invariant");
5105 guarantee(Millis > 0 , "Invariant");
5106
5107 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5108 // the initial park() operation.
5109 // Consider: use atomic decrement instead of CAS-loop
5110
5111 int v;
5112 for (;;) {
5113 v = _Event;
5114 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5115 }
5116 guarantee((v == 0) || (v == 1), "invariant");
5117 if (v != 0) return OS_OK;
5118
5119 // Do this the hard way by blocking ...
5120 // TODO: consider a brief spin here, gated on the success of recent
5121 // spin attempts by this thread.
5122 //
5123 // We decompose long timeouts into series of shorter timed waits.
5124 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5125 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5126 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5127 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5128 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5129 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5130 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5131 // for the already waited time. This policy does not admit any new outcomes.
5132 // In the future, however, we might want to track the accumulated wait time and
5133 // adjust Millis accordingly if we encounter a spurious wakeup.
5134
5135 const int MAXTIMEOUT = 0x10000000;
5136 DWORD rv = WAIT_TIMEOUT;
5137 while (_Event < 0 && Millis > 0) {
5138 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5139 if (Millis > MAXTIMEOUT) {
5140 prd = MAXTIMEOUT;
5141 }
5142 rv = ::WaitForSingleObject(_ParkHandle, prd);
5143 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5144 if (rv == WAIT_TIMEOUT) {
5145 Millis -= prd;
5146 }
5147 }
5148 v = _Event;
5149 _Event = 0;
5150 // see comment at end of os::PlatformEvent::park() below:
5151 OrderAccess::fence();
5152 // If we encounter a nearly simultanous timeout expiry and unpark()
5153 // we return OS_OK indicating we awoke via unpark().
5154 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5155 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5156 }
5157
5158 void os::PlatformEvent::park() {
5159 // Transitions for _Event:
5160 // -1 => -1 : illegal
5161 // 1 => 0 : pass - return immediately
5162 // 0 => -1 : block; then set _Event to 0 before returning
5163
5164 guarantee(_ParkHandle != NULL, "Invariant");
5165 // Invariant: Only the thread associated with the Event/PlatformEvent
5166 // may call park().
5167 // Consider: use atomic decrement instead of CAS-loop
5168 int v;
5169 for (;;) {
5170 v = _Event;
5171 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5172 }
5173 guarantee((v == 0) || (v == 1), "invariant");
5174 if (v != 0) return;
5175
5176 // Do this the hard way by blocking ...
5177 // TODO: consider a brief spin here, gated on the success of recent
5178 // spin attempts by this thread.
5179 while (_Event < 0) {
5180 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5181 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5182 }
5183
5184 // Usually we'll find _Event == 0 at this point, but as
5185 // an optional optimization we clear it, just in case can
5186 // multiple unpark() operations drove _Event up to 1.
5187 _Event = 0;
5188 OrderAccess::fence();
5189 guarantee(_Event >= 0, "invariant");
5190 }
5191
5192 void os::PlatformEvent::unpark() {
5193 guarantee(_ParkHandle != NULL, "Invariant");
5194
5195 // Transitions for _Event:
5196 // 0 => 1 : just return
5197 // 1 => 1 : just return
5198 // -1 => either 0 or 1; must signal target thread
5199 // That is, we can safely transition _Event from -1 to either
5200 // 0 or 1.
5201 // See also: "Semaphores in Plan 9" by Mullender & Cox
5202 //
5203 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5204 // that it will take two back-to-back park() calls for the owning
5205 // thread to block. This has the benefit of forcing a spurious return
5206 // from the first park() call after an unpark() call which will help
5207 // shake out uses of park() and unpark() without condition variables.
5208
5209 if (Atomic::xchg(1, &_Event) >= 0) return;
5210
5211 ::SetEvent(_ParkHandle);
5212 }
5213
5214
5215 // JSR166
5216 // -------------------------------------------------------
5217
5218 // The Windows implementation of Park is very straightforward: Basic
5219 // operations on Win32 Events turn out to have the right semantics to
5220 // use them directly. We opportunistically resuse the event inherited
5221 // from Monitor.
5222
5223 void Parker::park(bool isAbsolute, jlong time) {
5224 guarantee(_ParkEvent != NULL, "invariant");
5225 // First, demultiplex/decode time arguments
5226 if (time < 0) { // don't wait
5227 return;
5228 } else if (time == 0 && !isAbsolute) {
5229 time = INFINITE;
5230 } else if (isAbsolute) {
5231 time -= os::javaTimeMillis(); // convert to relative time
5232 if (time <= 0) { // already elapsed
5233 return;
5234 }
5235 } else { // relative
5236 time /= 1000000; // Must coarsen from nanos to millis
5237 if (time == 0) { // Wait for the minimal time unit if zero
5238 time = 1;
5239 }
5240 }
5241
5242 JavaThread* thread = JavaThread::current();
5243
5244 // Don't wait if interrupted or already triggered
5245 if (Thread::is_interrupted(thread, false) ||
5246 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5247 ResetEvent(_ParkEvent);
5248 return;
5249 } else {
5250 ThreadBlockInVM tbivm(thread);
5251 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5252 thread->set_suspend_equivalent();
5253
5254 WaitForSingleObject(_ParkEvent, time);
5255 ResetEvent(_ParkEvent);
5256
5257 // If externally suspended while waiting, re-suspend
5258 if (thread->handle_special_suspend_equivalent_condition()) {
5259 thread->java_suspend_self();
5260 }
5261 }
5262 }
5263
5264 void Parker::unpark() {
5265 guarantee(_ParkEvent != NULL, "invariant");
5266 SetEvent(_ParkEvent);
5267 }
5268
5269 // Run the specified command in a separate process. Return its exit value,
5270 // or -1 on failure (e.g. can't create a new process).
5271 int os::fork_and_exec(char* cmd) {
5272 STARTUPINFO si;
5273 PROCESS_INFORMATION pi;
5274
5275 memset(&si, 0, sizeof(si));
5276 si.cb = sizeof(si);
5277 memset(&pi, 0, sizeof(pi));
5278 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5279 cmd, // command line
5280 NULL, // process security attribute
5281 NULL, // thread security attribute
5282 TRUE, // inherits system handles
5283 0, // no creation flags
5284 NULL, // use parent's environment block
5285 NULL, // use parent's starting directory
5286 &si, // (in) startup information
5287 &pi); // (out) process information
5288
5289 if (rslt) {
5290 // Wait until child process exits.
5291 WaitForSingleObject(pi.hProcess, INFINITE);
5292
5293 DWORD exit_code;
5294 GetExitCodeProcess(pi.hProcess, &exit_code);
5295
5296 // Close process and thread handles.
5297 CloseHandle(pi.hProcess);
5298 CloseHandle(pi.hThread);
5299
5300 return (int)exit_code;
5301 } else {
5302 return -1;
5303 }
5304 }
5305
5306 //--------------------------------------------------------------------------------------------------
5307 // Non-product code
5308
5309 static int mallocDebugIntervalCounter = 0;
5310 static int mallocDebugCounter = 0;
5311 bool os::check_heap(bool force) {
5312 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5313 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5314 // Note: HeapValidate executes two hardware breakpoints when it finds something
5315 // wrong; at these points, eax contains the address of the offending block (I think).
5316 // To get to the exlicit error message(s) below, just continue twice.
5317 //
5318 // Note: we want to check the CRT heap, which is not necessarily located in the
5319 // process default heap.
5320 HANDLE heap = (HANDLE) _get_heap_handle();
5321 if (!heap) {
5322 return true;
5323 }
5324
5325 // If we fail to lock the heap, then gflags.exe has been used
5326 // or some other special heap flag has been set that prevents
5327 // locking. We don't try to walk a heap we can't lock.
5328 if (HeapLock(heap) != 0) {
5329 PROCESS_HEAP_ENTRY phe;
5330 phe.lpData = NULL;
5331 while (HeapWalk(heap, &phe) != 0) {
5332 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5333 !HeapValidate(heap, 0, phe.lpData)) {
5334 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5335 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5336 HeapUnlock(heap);
5337 fatal("corrupted C heap");
5338 }
5339 }
5340 DWORD err = GetLastError();
5341 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5342 HeapUnlock(heap);
5343 fatal("heap walk aborted with error %d", err);
5344 }
5345 HeapUnlock(heap);
5346 }
5347 mallocDebugIntervalCounter = 0;
5348 }
5349 return true;
5350 }
5351
5352
5353 bool os::find(address addr, outputStream* st) {
5354 int offset = -1;
5355 bool result = false;
5356 char buf[256];
5357 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5358 st->print(PTR_FORMAT " ", addr);
5359 if (strlen(buf) < sizeof(buf) - 1) {
5360 char* p = strrchr(buf, '\\');
5361 if (p) {
5362 st->print("%s", p + 1);
5363 } else {
5364 st->print("%s", buf);
5365 }
5366 } else {
5367 // The library name is probably truncated. Let's omit the library name.
5368 // See also JDK-8147512.
5369 }
5370 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5371 st->print("::%s + 0x%x", buf, offset);
5372 }
5373 st->cr();
5374 result = true;
5375 }
5376 return result;
5377 }
5378
5379 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5380 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5381
5382 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5383 JavaThread* thread = JavaThread::current();
5384 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5385 address addr = (address) exceptionRecord->ExceptionInformation[1];
5386
5387 if (os::is_memory_serialize_page(thread, addr)) {
5388 return EXCEPTION_CONTINUE_EXECUTION;
5389 }
5390 }
5391
5392 return EXCEPTION_CONTINUE_SEARCH;
5393 }
5394
5395 // We don't build a headless jre for Windows
5396 bool os::is_headless_jre() { return false; }
5397
5398 static jint initSock() {
5399 WSADATA wsadata;
5400
5401 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5402 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5403 ::GetLastError());
5404 return JNI_ERR;
5405 }
5406 return JNI_OK;
5407 }
5408
5409 struct hostent* os::get_host_by_name(char* name) {
5410 return (struct hostent*)gethostbyname(name);
5411 }
5412
5413 int os::socket_close(int fd) {
5414 return ::closesocket(fd);
5415 }
5416
5417 int os::socket(int domain, int type, int protocol) {
5418 return ::socket(domain, type, protocol);
5419 }
5420
5421 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5422 return ::connect(fd, him, len);
5423 }
5424
5425 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5426 return ::recv(fd, buf, (int)nBytes, flags);
5427 }
5428
5429 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5430 return ::send(fd, buf, (int)nBytes, flags);
5431 }
5432
5433 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5434 return ::send(fd, buf, (int)nBytes, flags);
5435 }
5436
5437 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5438 #if defined(IA32)
5439 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5440 #elif defined (AMD64)
5441 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5442 #endif
5443
5444 // returns true if thread could be suspended,
5445 // false otherwise
5446 static bool do_suspend(HANDLE* h) {
5447 if (h != NULL) {
5448 if (SuspendThread(*h) != ~0) {
5449 return true;
5450 }
5451 }
5452 return false;
5453 }
5454
5455 // resume the thread
5456 // calling resume on an active thread is a no-op
5457 static void do_resume(HANDLE* h) {
5458 if (h != NULL) {
5459 ResumeThread(*h);
5460 }
5461 }
5462
5463 // retrieve a suspend/resume context capable handle
5464 // from the tid. Caller validates handle return value.
5465 void get_thread_handle_for_extended_context(HANDLE* h,
5466 OSThread::thread_id_t tid) {
5467 if (h != NULL) {
5468 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5469 }
5470 }
5471
5472 // Thread sampling implementation
5473 //
5474 void os::SuspendedThreadTask::internal_do_task() {
5475 CONTEXT ctxt;
5476 HANDLE h = NULL;
5477
5478 // get context capable handle for thread
5479 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5480
5481 // sanity
5482 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5483 return;
5484 }
5485
5486 // suspend the thread
5487 if (do_suspend(&h)) {
5488 ctxt.ContextFlags = sampling_context_flags;
5489 // get thread context
5490 GetThreadContext(h, &ctxt);
5491 SuspendedThreadTaskContext context(_thread, &ctxt);
5492 // pass context to Thread Sampling impl
5493 do_task(context);
5494 // resume thread
5495 do_resume(&h);
5496 }
5497
5498 // close handle
5499 CloseHandle(h);
5500 }
5501
5502 bool os::start_debugging(char *buf, int buflen) {
5503 int len = (int)strlen(buf);
5504 char *p = &buf[len];
5505
5506 jio_snprintf(p, buflen-len,
5507 "\n\n"
5508 "Do you want to debug the problem?\n\n"
5509 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5510 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5511 "Otherwise, select 'No' to abort...",
5512 os::current_process_id(), os::current_thread_id());
5513
5514 bool yes = os::message_box("Unexpected Error", buf);
5515
5516 if (yes) {
5517 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5518 // exception. If VM is running inside a debugger, the debugger will
5519 // catch the exception. Otherwise, the breakpoint exception will reach
5520 // the default windows exception handler, which can spawn a debugger and
5521 // automatically attach to the dying VM.
5522 os::breakpoint();
5523 yes = false;
5524 }
5525 return yes;
5526 }
5527
5528 void* os::get_default_process_handle() {
5529 return (void*)GetModuleHandle(NULL);
5530 }
5531
5532 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5533 // which is used to find statically linked in agents.
5534 // Additionally for windows, takes into account __stdcall names.
5535 // Parameters:
5536 // sym_name: Symbol in library we are looking for
5537 // lib_name: Name of library to look in, NULL for shared libs.
5538 // is_absolute_path == true if lib_name is absolute path to agent
5539 // such as "C:/a/b/L.dll"
5540 // == false if only the base name of the library is passed in
5541 // such as "L"
5542 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5543 bool is_absolute_path) {
5544 char *agent_entry_name;
5545 size_t len;
5546 size_t name_len;
5547 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5548 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5549 const char *start;
5550
5551 if (lib_name != NULL) {
5552 len = name_len = strlen(lib_name);
5553 if (is_absolute_path) {
5554 // Need to strip path, prefix and suffix
5555 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5556 lib_name = ++start;
5557 } else {
5558 // Need to check for drive prefix
5559 if ((start = strchr(lib_name, ':')) != NULL) {
5560 lib_name = ++start;
5561 }
5562 }
5563 if (len <= (prefix_len + suffix_len)) {
5564 return NULL;
5565 }
5566 lib_name += prefix_len;
5567 name_len = strlen(lib_name) - suffix_len;
5568 }
5569 }
5570 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5571 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5572 if (agent_entry_name == NULL) {
5573 return NULL;
5574 }
5575 if (lib_name != NULL) {
5576 const char *p = strrchr(sym_name, '@');
5577 if (p != NULL && p != sym_name) {
5578 // sym_name == _Agent_OnLoad@XX
5579 strncpy(agent_entry_name, sym_name, (p - sym_name));
5580 agent_entry_name[(p-sym_name)] = '\0';
5581 // agent_entry_name == _Agent_OnLoad
5582 strcat(agent_entry_name, "_");
5583 strncat(agent_entry_name, lib_name, name_len);
5584 strcat(agent_entry_name, p);
5585 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5586 } else {
5587 strcpy(agent_entry_name, sym_name);
5588 strcat(agent_entry_name, "_");
5589 strncat(agent_entry_name, lib_name, name_len);
5590 }
5591 } else {
5592 strcpy(agent_entry_name, sym_name);
5593 }
5594 return agent_entry_name;
5595 }
5596
5597 #ifndef PRODUCT
5598
5599 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5600 // contiguous memory block at a particular address.
5601 // The test first tries to find a good approximate address to allocate at by using the same
5602 // method to allocate some memory at any address. The test then tries to allocate memory in
5603 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5604 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5605 // the previously allocated memory is available for allocation. The only actual failure
5606 // that is reported is when the test tries to allocate at a particular location but gets a
5607 // different valid one. A NULL return value at this point is not considered an error but may
5608 // be legitimate.
5609 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5610 void TestReserveMemorySpecial_test() {
5611 if (!UseLargePages) {
5612 if (VerboseInternalVMTests) {
5613 tty->print("Skipping test because large pages are disabled");
5614 }
5615 return;
5616 }
5617 // save current value of globals
5618 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5619 bool old_use_numa_interleaving = UseNUMAInterleaving;
5620
5621 // set globals to make sure we hit the correct code path
5622 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5623
5624 // do an allocation at an address selected by the OS to get a good one.
5625 const size_t large_allocation_size = os::large_page_size() * 4;
5626 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5627 if (result == NULL) {
5628 if (VerboseInternalVMTests) {
5629 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5630 large_allocation_size);
5631 }
5632 } else {
5633 os::release_memory_special(result, large_allocation_size);
5634
5635 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5636 // we managed to get it once.
5637 const size_t expected_allocation_size = os::large_page_size();
5638 char* expected_location = result + os::large_page_size();
5639 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5640 if (actual_location == NULL) {
5641 if (VerboseInternalVMTests) {
5642 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5643 expected_location, large_allocation_size);
5644 }
5645 } else {
5646 // release memory
5647 os::release_memory_special(actual_location, expected_allocation_size);
5648 // only now check, after releasing any memory to avoid any leaks.
5649 assert(actual_location == expected_location,
5650 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5651 expected_location, expected_allocation_size, actual_location);
5652 }
5653 }
5654
5655 // restore globals
5656 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5657 UseNUMAInterleaving = old_use_numa_interleaving;
5658 }
5659 #endif // PRODUCT
5660
5661 /*
5662 All the defined signal names for Windows.
5663
5664 NOTE that not all of these names are accepted by FindSignal!
5665
5666 For various reasons some of these may be rejected at runtime.
5667
5668 Here are the names currently accepted by a user of sun.misc.Signal with
5669 1.4.1 (ignoring potential interaction with use of chaining, etc):
5670
5671 (LIST TBD)
5672
5673 */
5674 int os::get_signal_number(const char* name) {
5675 static const struct {
5676 char* name;
5677 int number;
5678 } siglabels [] =
5679 // derived from version 6.0 VC98/include/signal.h
5680 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5681 "FPE", SIGFPE, // floating point exception
5682 "SEGV", SIGSEGV, // segment violation
5683 "INT", SIGINT, // interrupt
5684 "TERM", SIGTERM, // software term signal from kill
5685 "BREAK", SIGBREAK, // Ctrl-Break sequence
5686 "ILL", SIGILL}; // illegal instruction
5687 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5688 if (strcmp(name, siglabels[i].name) == 0) {
5689 return siglabels[i].number;
5690 }
5691 }
5692 return -1;
5693 }
5694
5695 // Fast current thread access
5696
5697 int os::win32::_thread_ptr_offset = 0;
5698
5699 static void call_wrapper_dummy() {}
5700
5701 // We need to call the os_exception_wrapper once so that it sets
5702 // up the offset from FS of the thread pointer.
5703 void os::win32::initialize_thread_ptr_offset() {
5704 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5705 NULL, NULL, NULL, NULL);
5706 }