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