1 /*
2 * Copyright (c) 1997, 2019, 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 "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_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.inline.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.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 "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.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 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84
85 #include <windows.h>
86 #include <sys/types.h>
87 #include <sys/stat.h>
88 #include <sys/timeb.h>
89 #include <objidl.h>
90 #include <shlobj.h>
91
92 #include <malloc.h>
93 #include <signal.h>
94 #include <direct.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <io.h>
98 #include <process.h> // For _beginthreadex(), _endthreadex()
99 #include <imagehlp.h> // For os::dll_address_to_function_name
100 // for enumerating dll libraries
101 #include <vdmdbg.h>
102 #include <psapi.h>
103 #include <mmsystem.h>
104 #include <winsock2.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(-1)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _M_AMD64
124 #define __CPU__ amd64
125 #else
126 #define __CPU__ i486
127 #endif
128
129 #if INCLUDE_AOT
130 PVOID topLevelVectoredExceptionHandler = NULL;
131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
132 #endif
133
134 // save DLL module handle, used by GetModuleFileName
135
136 HINSTANCE vm_lib_handle;
137
138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
139 switch (reason) {
140 case DLL_PROCESS_ATTACH:
141 vm_lib_handle = hinst;
142 if (ForceTimeHighResolution) {
143 timeBeginPeriod(1L);
144 }
145 WindowsDbgHelp::pre_initialize();
146 SymbolEngine::pre_initialize();
147 break;
148 case DLL_PROCESS_DETACH:
149 if (ForceTimeHighResolution) {
150 timeEndPeriod(1L);
151 }
152 #if INCLUDE_AOT
153 if (topLevelVectoredExceptionHandler != NULL) {
154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
155 topLevelVectoredExceptionHandler = NULL;
156 }
157 #endif
158 break;
159 default:
160 break;
161 }
162 return true;
163 }
164
165 static inline double fileTimeAsDouble(FILETIME* time) {
166 const double high = (double) ((unsigned int) ~0);
167 const double split = 10000000.0;
168 double result = (time->dwLowDateTime / split) +
169 time->dwHighDateTime * (high/split);
170 return result;
171 }
172
173 // Implementation of os
174
175 bool os::unsetenv(const char* name) {
176 assert(name != NULL, "Null pointer");
177 return (SetEnvironmentVariable(name, NULL) == TRUE);
178 }
179
180 // No setuid programs under Windows.
181 bool os::have_special_privileges() {
182 return false;
183 }
184
185
186 // This method is a periodic task to check for misbehaving JNI applications
187 // under CheckJNI, we can add any periodic checks here.
188 // For Windows at the moment does nothing
189 void os::run_periodic_checks() {
190 return;
191 }
192
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197
198 void os::init_system_properties_values() {
199 // sysclasspath, java_home, dll_dir
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 const char *bin = "\\bin";
205 char home_dir[MAX_PATH + 1];
206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
207
208 if (alt_home_dir != NULL) {
209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
210 home_dir[MAX_PATH] = '\0';
211 } else {
212 os::jvm_path(home_dir, sizeof(home_dir));
213 // Found the full path to jvm.dll.
214 // Now cut the path to <java_home>/jre if we can.
215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \{client|server}
219 pslash = strrchr(home_dir, '\\');
220 if (pslash != NULL) {
221 *pslash = '\0'; // get rid of \bin
222 }
223 }
224 }
225
226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
227 if (home_path == NULL) {
228 return;
229 }
230 strcpy(home_path, home_dir);
231 Arguments::set_java_home(home_path);
232 FREE_C_HEAP_ARRAY(char, home_path);
233
234 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
235 mtInternal);
236 if (dll_path == NULL) {
237 return;
238 }
239 strcpy(dll_path, home_dir);
240 strcat(dll_path, bin);
241 Arguments::set_dll_dir(dll_path);
242 FREE_C_HEAP_ARRAY(char, dll_path);
243
244 if (!set_boot_path('\\', ';')) {
245 vm_exit_during_initialization("Failed setting boot class path.", NULL);
246 }
247 }
248
249 // library_path
250 #define EXT_DIR "\\lib\\ext"
251 #define BIN_DIR "\\bin"
252 #define PACKAGE_DIR "\\Sun\\Java"
253 {
254 // Win32 library search order (See the documentation for LoadLibrary):
255 //
256 // 1. The directory from which application is loaded.
257 // 2. The system wide Java Extensions directory (Java only)
258 // 3. System directory (GetSystemDirectory)
259 // 4. Windows directory (GetWindowsDirectory)
260 // 5. The PATH environment variable
261 // 6. The current directory
262
263 char *library_path;
264 char tmp[MAX_PATH];
265 char *path_str = ::getenv("PATH");
266
267 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
268 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
269
270 library_path[0] = '\0';
271
272 GetModuleFileName(NULL, tmp, sizeof(tmp));
273 *(strrchr(tmp, '\\')) = '\0';
274 strcat(library_path, tmp);
275
276 GetWindowsDirectory(tmp, sizeof(tmp));
277 strcat(library_path, ";");
278 strcat(library_path, tmp);
279 strcat(library_path, PACKAGE_DIR BIN_DIR);
280
281 GetSystemDirectory(tmp, sizeof(tmp));
282 strcat(library_path, ";");
283 strcat(library_path, tmp);
284
285 GetWindowsDirectory(tmp, sizeof(tmp));
286 strcat(library_path, ";");
287 strcat(library_path, tmp);
288
289 if (path_str) {
290 strcat(library_path, ";");
291 strcat(library_path, path_str);
292 }
293
294 strcat(library_path, ";.");
295
296 Arguments::set_library_path(library_path);
297 FREE_C_HEAP_ARRAY(char, library_path);
298 }
299
300 // Default extensions directory
301 {
302 char path[MAX_PATH];
303 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
304 GetWindowsDirectory(path, MAX_PATH);
305 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
306 path, PACKAGE_DIR, EXT_DIR);
307 Arguments::set_ext_dirs(buf);
308 }
309 #undef EXT_DIR
310 #undef BIN_DIR
311 #undef PACKAGE_DIR
312
313 #ifndef _WIN64
314 // set our UnhandledExceptionFilter and save any previous one
315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
316 #endif
317
318 // Done
319 return;
320 }
321
322 void os::breakpoint() {
323 DebugBreak();
324 }
325
326 // Invoked from the BREAKPOINT Macro
327 extern "C" void breakpoint() {
328 os::breakpoint();
329 }
330
331 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
332 // So far, this method is only used by Native Memory Tracking, which is
333 // only supported on Windows XP or later.
334 //
335 int os::get_native_stack(address* stack, int frames, int toSkip) {
336 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
337 for (int index = captured; index < frames; index ++) {
338 stack[index] = NULL;
339 }
340 return captured;
341 }
342
343
344 // os::current_stack_base()
345 //
346 // Returns the base of the stack, which is the stack's
347 // starting address. This function must be called
348 // while running on the stack of the thread being queried.
349
350 address os::current_stack_base() {
351 MEMORY_BASIC_INFORMATION minfo;
352 address stack_bottom;
353 size_t stack_size;
354
355 VirtualQuery(&minfo, &minfo, sizeof(minfo));
356 stack_bottom = (address)minfo.AllocationBase;
357 stack_size = minfo.RegionSize;
358
359 // Add up the sizes of all the regions with the same
360 // AllocationBase.
361 while (1) {
362 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
363 if (stack_bottom == (address)minfo.AllocationBase) {
364 stack_size += minfo.RegionSize;
365 } else {
366 break;
367 }
368 }
369 return stack_bottom + stack_size;
370 }
371
372 size_t os::current_stack_size() {
373 size_t sz;
374 MEMORY_BASIC_INFORMATION minfo;
375 VirtualQuery(&minfo, &minfo, sizeof(minfo));
376 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
377 return sz;
378 }
379
380 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
381 MEMORY_BASIC_INFORMATION minfo;
382 committed_start = NULL;
383 committed_size = 0;
384 address top = start + size;
385 const address start_addr = start;
386 while (start < top) {
387 VirtualQuery(start, &minfo, sizeof(minfo));
388 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
389 if (committed_start != NULL) {
390 break;
391 }
392 } else { // committed
393 if (committed_start == NULL) {
394 committed_start = start;
395 }
396 size_t offset = start - (address)minfo.BaseAddress;
397 committed_size += minfo.RegionSize - offset;
398 }
399 start = (address)minfo.BaseAddress + minfo.RegionSize;
400 }
401
402 if (committed_start == NULL) {
403 assert(committed_size == 0, "Sanity");
404 return false;
405 } else {
406 assert(committed_start >= start_addr && committed_start < top, "Out of range");
407 // current region may go beyond the limit, trim to the limit
408 committed_size = MIN2(committed_size, size_t(top - committed_start));
409 return true;
410 }
411 }
412
413 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
414 const struct tm* time_struct_ptr = localtime(clock);
415 if (time_struct_ptr != NULL) {
416 *res = *time_struct_ptr;
417 return res;
418 }
419 return NULL;
420 }
421
422 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
423 const struct tm* time_struct_ptr = gmtime(clock);
424 if (time_struct_ptr != NULL) {
425 *res = *time_struct_ptr;
426 return res;
427 }
428 return NULL;
429 }
430
431 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
432
433 // Thread start routine for all newly created threads
434 static unsigned __stdcall thread_native_entry(Thread* thread) {
435
436 thread->record_stack_base_and_size();
437
438 // Try to randomize the cache line index of hot stack frames.
439 // This helps when threads of the same stack traces evict each other's
440 // cache lines. The threads can be either from the same JVM instance, or
441 // from different JVM instances. The benefit is especially true for
442 // processors with hyperthreading technology.
443 static int counter = 0;
444 int pid = os::current_process_id();
445 _alloca(((pid ^ counter++) & 7) * 128);
446
447 thread->initialize_thread_current();
448
449 OSThread* osthr = thread->osthread();
450 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
451
452 if (UseNUMA) {
453 int lgrp_id = os::numa_get_group_id();
454 if (lgrp_id != -1) {
455 thread->set_lgrp_id(lgrp_id);
456 }
457 }
458
459 // Diagnostic code to investigate JDK-6573254
460 int res = 30115; // non-java thread
461 if (thread->is_Java_thread()) {
462 res = 20115; // java thread
463 }
464
465 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
466
467 // Install a win32 structured exception handler around every thread created
468 // by VM, so VM can generate error dump when an exception occurred in non-
469 // Java thread (e.g. VM thread).
470 __try {
471 thread->call_run();
472 } __except(topLevelExceptionFilter(
473 (_EXCEPTION_POINTERS*)_exception_info())) {
474 // Nothing to do.
475 }
476
477 // Note: at this point the thread object may already have deleted itself.
478 // Do not dereference it from here on out.
479
480 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
481
482 // One less thread is executing
483 // When the VMThread gets here, the main thread may have already exited
484 // which frees the CodeHeap containing the Atomic::add code
485 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
486 Atomic::dec(&os::win32::_os_thread_count);
487 }
488
489 // Thread must not return from exit_process_or_thread(), but if it does,
490 // let it proceed to exit normally
491 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
492 }
493
494 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
495 int thread_id) {
496 // Allocate the OSThread object
497 OSThread* osthread = new OSThread(NULL, NULL);
498 if (osthread == NULL) return NULL;
499
500 // Initialize the JDK library's interrupt event.
501 // This should really be done when OSThread is constructed,
502 // but there is no way for a constructor to report failure to
503 // allocate the event.
504 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
505 if (interrupt_event == NULL) {
506 delete osthread;
507 return NULL;
508 }
509 osthread->set_interrupt_event(interrupt_event);
510
511 // Store info on the Win32 thread into the OSThread
512 osthread->set_thread_handle(thread_handle);
513 osthread->set_thread_id(thread_id);
514
515 if (UseNUMA) {
516 int lgrp_id = os::numa_get_group_id();
517 if (lgrp_id != -1) {
518 thread->set_lgrp_id(lgrp_id);
519 }
520 }
521
522 // Initial thread state is INITIALIZED, not SUSPENDED
523 osthread->set_state(INITIALIZED);
524
525 return osthread;
526 }
527
528
529 bool os::create_attached_thread(JavaThread* thread) {
530 #ifdef ASSERT
531 thread->verify_not_published();
532 #endif
533 HANDLE thread_h;
534 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
535 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
536 fatal("DuplicateHandle failed\n");
537 }
538 OSThread* osthread = create_os_thread(thread, thread_h,
539 (int)current_thread_id());
540 if (osthread == NULL) {
541 return false;
542 }
543
544 // Initial thread state is RUNNABLE
545 osthread->set_state(RUNNABLE);
546
547 thread->set_osthread(osthread);
548
549 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
550 os::current_thread_id());
551
552 return true;
553 }
554
555 bool os::create_main_thread(JavaThread* thread) {
556 #ifdef ASSERT
557 thread->verify_not_published();
558 #endif
559 if (_starting_thread == NULL) {
560 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
561 if (_starting_thread == NULL) {
562 return false;
563 }
564 }
565
566 // The primordial thread is runnable from the start)
567 _starting_thread->set_state(RUNNABLE);
568
569 thread->set_osthread(_starting_thread);
570 return true;
571 }
572
573 // Helper function to trace _beginthreadex attributes,
574 // similar to os::Posix::describe_pthread_attr()
575 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
576 size_t stacksize, unsigned initflag) {
577 stringStream ss(buf, buflen);
578 if (stacksize == 0) {
579 ss.print("stacksize: default, ");
580 } else {
581 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
582 }
583 ss.print("flags: ");
584 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
585 #define ALL(X) \
586 X(CREATE_SUSPENDED) \
587 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
588 ALL(PRINT_FLAG)
589 #undef ALL
590 #undef PRINT_FLAG
591 return buf;
592 }
593
594 // Allocate and initialize a new OSThread
595 bool os::create_thread(Thread* thread, ThreadType thr_type,
596 size_t stack_size) {
597 unsigned thread_id;
598
599 // Allocate the OSThread object
600 OSThread* osthread = new OSThread(NULL, NULL);
601 if (osthread == NULL) {
602 return false;
603 }
604
605 // Initialize the JDK library's interrupt event.
606 // This should really be done when OSThread is constructed,
607 // but there is no way for a constructor to report failure to
608 // allocate the event.
609 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
610 if (interrupt_event == NULL) {
611 delete osthread;
612 return false;
613 }
614 osthread->set_interrupt_event(interrupt_event);
615 osthread->set_interrupted(false);
616
617 thread->set_osthread(osthread);
618
619 if (stack_size == 0) {
620 switch (thr_type) {
621 case os::java_thread:
622 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
623 if (JavaThread::stack_size_at_create() > 0) {
624 stack_size = JavaThread::stack_size_at_create();
625 }
626 break;
627 case os::compiler_thread:
628 if (CompilerThreadStackSize > 0) {
629 stack_size = (size_t)(CompilerThreadStackSize * K);
630 break;
631 } // else fall through:
632 // use VMThreadStackSize if CompilerThreadStackSize is not defined
633 case os::vm_thread:
634 case os::pgc_thread:
635 case os::cgc_thread:
636 case os::watcher_thread:
637 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
638 break;
639 }
640 }
641
642 // Create the Win32 thread
643 //
644 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
645 // does not specify stack size. Instead, it specifies the size of
646 // initially committed space. The stack size is determined by
647 // PE header in the executable. If the committed "stack_size" is larger
648 // than default value in the PE header, the stack is rounded up to the
649 // nearest multiple of 1MB. For example if the launcher has default
650 // stack size of 320k, specifying any size less than 320k does not
651 // affect the actual stack size at all, it only affects the initial
652 // commitment. On the other hand, specifying 'stack_size' larger than
653 // default value may cause significant increase in memory usage, because
654 // not only the stack space will be rounded up to MB, but also the
655 // entire space is committed upfront.
656 //
657 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
658 // for CreateThread() that can treat 'stack_size' as stack size. However we
659 // are not supposed to call CreateThread() directly according to MSDN
660 // document because JVM uses C runtime library. The good news is that the
661 // flag appears to work with _beginthredex() as well.
662
663 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
664 HANDLE thread_handle =
665 (HANDLE)_beginthreadex(NULL,
666 (unsigned)stack_size,
667 (unsigned (__stdcall *)(void*)) thread_native_entry,
668 thread,
669 initflag,
670 &thread_id);
671
672 char buf[64];
673 if (thread_handle != NULL) {
674 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
675 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
676 } else {
677 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
678 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
679 // Log some OS information which might explain why creating the thread failed.
680 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
681 LogStream st(Log(os, thread)::info());
682 os::print_memory_info(&st);
683 }
684
685 if (thread_handle == NULL) {
686 // Need to clean up stuff we've allocated so far
687 CloseHandle(osthread->interrupt_event());
688 thread->set_osthread(NULL);
689 delete osthread;
690 return false;
691 }
692
693 Atomic::inc(&os::win32::_os_thread_count);
694
695 // Store info on the Win32 thread into the OSThread
696 osthread->set_thread_handle(thread_handle);
697 osthread->set_thread_id(thread_id);
698
699 // Initial thread state is INITIALIZED, not SUSPENDED
700 osthread->set_state(INITIALIZED);
701
702 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
703 return true;
704 }
705
706
707 // Free Win32 resources related to the OSThread
708 void os::free_thread(OSThread* osthread) {
709 assert(osthread != NULL, "osthread not set");
710
711 // We are told to free resources of the argument thread,
712 // but we can only really operate on the current thread.
713 assert(Thread::current()->osthread() == osthread,
714 "os::free_thread but not current thread");
715
716 CloseHandle(osthread->thread_handle());
717 CloseHandle(osthread->interrupt_event());
718 delete osthread;
719 }
720
721 static jlong first_filetime;
722 static jlong initial_performance_count;
723 static jlong performance_frequency;
724
725
726 jlong as_long(LARGE_INTEGER x) {
727 jlong result = 0; // initialization to avoid warning
728 set_high(&result, x.HighPart);
729 set_low(&result, x.LowPart);
730 return result;
731 }
732
733
734 jlong os::elapsed_counter() {
735 LARGE_INTEGER count;
736 QueryPerformanceCounter(&count);
737 return as_long(count) - initial_performance_count;
738 }
739
740
741 jlong os::elapsed_frequency() {
742 return performance_frequency;
743 }
744
745
746 julong os::available_memory() {
747 return win32::available_memory();
748 }
749
750 julong os::win32::available_memory() {
751 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
752 // value if total memory is larger than 4GB
753 MEMORYSTATUSEX ms;
754 ms.dwLength = sizeof(ms);
755 GlobalMemoryStatusEx(&ms);
756
757 return (julong)ms.ullAvailPhys;
758 }
759
760 julong os::physical_memory() {
761 return win32::physical_memory();
762 }
763
764 bool os::has_allocatable_memory_limit(julong* limit) {
765 MEMORYSTATUSEX ms;
766 ms.dwLength = sizeof(ms);
767 GlobalMemoryStatusEx(&ms);
768 #ifdef _LP64
769 *limit = (julong)ms.ullAvailVirtual;
770 return true;
771 #else
772 // Limit to 1400m because of the 2gb address space wall
773 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
774 return true;
775 #endif
776 }
777
778 int os::active_processor_count() {
779 // User has overridden the number of active processors
780 if (ActiveProcessorCount > 0) {
781 log_trace(os)("active_processor_count: "
782 "active processor count set by user : %d",
783 ActiveProcessorCount);
784 return ActiveProcessorCount;
785 }
786
787 DWORD_PTR lpProcessAffinityMask = 0;
788 DWORD_PTR lpSystemAffinityMask = 0;
789 int proc_count = processor_count();
790 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
791 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
792 // Nof active processors is number of bits in process affinity mask
793 int bitcount = 0;
794 while (lpProcessAffinityMask != 0) {
795 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
796 bitcount++;
797 }
798 return bitcount;
799 } else {
800 return proc_count;
801 }
802 }
803
804 void os::set_native_thread_name(const char *name) {
805
806 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
807 //
808 // Note that unfortunately this only works if the process
809 // is already attached to a debugger; debugger must observe
810 // the exception below to show the correct name.
811
812 // If there is no debugger attached skip raising the exception
813 if (!IsDebuggerPresent()) {
814 return;
815 }
816
817 const DWORD MS_VC_EXCEPTION = 0x406D1388;
818 struct {
819 DWORD dwType; // must be 0x1000
820 LPCSTR szName; // pointer to name (in user addr space)
821 DWORD dwThreadID; // thread ID (-1=caller thread)
822 DWORD dwFlags; // reserved for future use, must be zero
823 } info;
824
825 info.dwType = 0x1000;
826 info.szName = name;
827 info.dwThreadID = -1;
828 info.dwFlags = 0;
829
830 __try {
831 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
832 } __except(EXCEPTION_EXECUTE_HANDLER) {}
833 }
834
835 bool os::distribute_processes(uint length, uint* distribution) {
836 // Not yet implemented.
837 return false;
838 }
839
840 bool os::bind_to_processor(uint processor_id) {
841 // Not yet implemented.
842 return false;
843 }
844
845 void os::win32::initialize_performance_counter() {
846 LARGE_INTEGER count;
847 QueryPerformanceFrequency(&count);
848 performance_frequency = as_long(count);
849 QueryPerformanceCounter(&count);
850 initial_performance_count = as_long(count);
851 }
852
853
854 double os::elapsedTime() {
855 return (double) elapsed_counter() / (double) elapsed_frequency();
856 }
857
858
859 // Windows format:
860 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
861 // Java format:
862 // Java standards require the number of milliseconds since 1/1/1970
863
864 // Constant offset - calculated using offset()
865 static jlong _offset = 116444736000000000;
866 // Fake time counter for reproducible results when debugging
867 static jlong fake_time = 0;
868
869 #ifdef ASSERT
870 // Just to be safe, recalculate the offset in debug mode
871 static jlong _calculated_offset = 0;
872 static int _has_calculated_offset = 0;
873
874 jlong offset() {
875 if (_has_calculated_offset) return _calculated_offset;
876 SYSTEMTIME java_origin;
877 java_origin.wYear = 1970;
878 java_origin.wMonth = 1;
879 java_origin.wDayOfWeek = 0; // ignored
880 java_origin.wDay = 1;
881 java_origin.wHour = 0;
882 java_origin.wMinute = 0;
883 java_origin.wSecond = 0;
884 java_origin.wMilliseconds = 0;
885 FILETIME jot;
886 if (!SystemTimeToFileTime(&java_origin, &jot)) {
887 fatal("Error = %d\nWindows error", GetLastError());
888 }
889 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
890 _has_calculated_offset = 1;
891 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
892 return _calculated_offset;
893 }
894 #else
895 jlong offset() {
896 return _offset;
897 }
898 #endif
899
900 jlong windows_to_java_time(FILETIME wt) {
901 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
902 return (a - offset()) / 10000;
903 }
904
905 // Returns time ticks in (10th of micro seconds)
906 jlong windows_to_time_ticks(FILETIME wt) {
907 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
908 return (a - offset());
909 }
910
911 FILETIME java_to_windows_time(jlong l) {
912 jlong a = (l * 10000) + offset();
913 FILETIME result;
914 result.dwHighDateTime = high(a);
915 result.dwLowDateTime = low(a);
916 return result;
917 }
918
919 bool os::supports_vtime() { return true; }
920 bool os::enable_vtime() { return false; }
921 bool os::vtime_enabled() { return false; }
922
923 double os::elapsedVTime() {
924 FILETIME created;
925 FILETIME exited;
926 FILETIME kernel;
927 FILETIME user;
928 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
929 // the resolution of windows_to_java_time() should be sufficient (ms)
930 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
931 } else {
932 return elapsedTime();
933 }
934 }
935
936 jlong os::javaTimeMillis() {
937 FILETIME wt;
938 GetSystemTimeAsFileTime(&wt);
939 return windows_to_java_time(wt);
940 }
941
942 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
943 FILETIME wt;
944 GetSystemTimeAsFileTime(&wt);
945 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
946 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
947 seconds = secs;
948 nanos = jlong(ticks - (secs*10000000)) * 100;
949 }
950
951 jlong os::javaTimeNanos() {
952 LARGE_INTEGER current_count;
953 QueryPerformanceCounter(¤t_count);
954 double current = as_long(current_count);
955 double freq = performance_frequency;
956 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
957 return time;
958 }
959
960 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
961 jlong freq = performance_frequency;
962 if (freq < NANOSECS_PER_SEC) {
963 // the performance counter is 64 bits and we will
964 // be multiplying it -- so no wrap in 64 bits
965 info_ptr->max_value = ALL_64_BITS;
966 } else if (freq > NANOSECS_PER_SEC) {
967 // use the max value the counter can reach to
968 // determine the max value which could be returned
969 julong max_counter = (julong)ALL_64_BITS;
970 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
971 } else {
972 // the performance counter is 64 bits and we will
973 // be using it directly -- so no wrap in 64 bits
974 info_ptr->max_value = ALL_64_BITS;
975 }
976
977 // using a counter, so no skipping
978 info_ptr->may_skip_backward = false;
979 info_ptr->may_skip_forward = false;
980
981 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
982 }
983
984 char* os::local_time_string(char *buf, size_t buflen) {
985 SYSTEMTIME st;
986 GetLocalTime(&st);
987 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
988 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
989 return buf;
990 }
991
992 bool os::getTimesSecs(double* process_real_time,
993 double* process_user_time,
994 double* process_system_time) {
995 HANDLE h_process = GetCurrentProcess();
996 FILETIME create_time, exit_time, kernel_time, user_time;
997 BOOL result = GetProcessTimes(h_process,
998 &create_time,
999 &exit_time,
1000 &kernel_time,
1001 &user_time);
1002 if (result != 0) {
1003 FILETIME wt;
1004 GetSystemTimeAsFileTime(&wt);
1005 jlong rtc_millis = windows_to_java_time(wt);
1006 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
1007 *process_user_time =
1008 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1009 *process_system_time =
1010 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1011 return true;
1012 } else {
1013 return false;
1014 }
1015 }
1016
1017 void os::shutdown() {
1018 // allow PerfMemory to attempt cleanup of any persistent resources
1019 perfMemory_exit();
1020
1021 // flush buffered output, finish log files
1022 ostream_abort();
1023
1024 // Check for abort hook
1025 abort_hook_t abort_hook = Arguments::abort_hook();
1026 if (abort_hook != NULL) {
1027 abort_hook();
1028 }
1029 }
1030
1031
1032 static HANDLE dumpFile = NULL;
1033
1034 // Check if dump file can be created.
1035 void os::check_dump_limit(char* buffer, size_t buffsz) {
1036 bool status = true;
1037 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1038 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1039 status = false;
1040 }
1041
1042 #ifndef ASSERT
1043 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1044 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1045 status = false;
1046 }
1047 #endif
1048
1049 if (status) {
1050 const char* cwd = get_current_directory(NULL, 0);
1051 int pid = current_process_id();
1052 if (cwd != NULL) {
1053 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1054 } else {
1055 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1056 }
1057
1058 if (dumpFile == NULL &&
1059 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1060 == INVALID_HANDLE_VALUE) {
1061 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1062 status = false;
1063 }
1064 }
1065 VMError::record_coredump_status(buffer, status);
1066 }
1067
1068 void os::abort(bool dump_core, void* siginfo, const void* context) {
1069 EXCEPTION_POINTERS ep;
1070 MINIDUMP_EXCEPTION_INFORMATION mei;
1071 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1072
1073 HANDLE hProcess = GetCurrentProcess();
1074 DWORD processId = GetCurrentProcessId();
1075 MINIDUMP_TYPE dumpType;
1076
1077 shutdown();
1078 if (!dump_core || dumpFile == NULL) {
1079 if (dumpFile != NULL) {
1080 CloseHandle(dumpFile);
1081 }
1082 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1083 }
1084
1085 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1086 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1087
1088 if (siginfo != NULL && context != NULL) {
1089 ep.ContextRecord = (PCONTEXT) context;
1090 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1091
1092 mei.ThreadId = GetCurrentThreadId();
1093 mei.ExceptionPointers = &ep;
1094 pmei = &mei;
1095 } else {
1096 pmei = NULL;
1097 }
1098
1099 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1100 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1101 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1102 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1103 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1104 }
1105 CloseHandle(dumpFile);
1106 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1107 }
1108
1109 // Die immediately, no exit hook, no abort hook, no cleanup.
1110 void os::die() {
1111 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1112 }
1113
1114 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1115 // * dirent_md.c 1.15 00/02/02
1116 //
1117 // The declarations for DIR and struct dirent are in jvm_win32.h.
1118
1119 // Caller must have already run dirname through JVM_NativePath, which removes
1120 // duplicate slashes and converts all instances of '/' into '\\'.
1121
1122 DIR * os::opendir(const char *dirname) {
1123 assert(dirname != NULL, "just checking"); // hotspot change
1124 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1125 DWORD fattr; // hotspot change
1126 char alt_dirname[4] = { 0, 0, 0, 0 };
1127
1128 if (dirp == 0) {
1129 errno = ENOMEM;
1130 return 0;
1131 }
1132
1133 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1134 // as a directory in FindFirstFile(). We detect this case here and
1135 // prepend the current drive name.
1136 //
1137 if (dirname[1] == '\0' && dirname[0] == '\\') {
1138 alt_dirname[0] = _getdrive() + 'A' - 1;
1139 alt_dirname[1] = ':';
1140 alt_dirname[2] = '\\';
1141 alt_dirname[3] = '\0';
1142 dirname = alt_dirname;
1143 }
1144
1145 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1146 if (dirp->path == 0) {
1147 free(dirp);
1148 errno = ENOMEM;
1149 return 0;
1150 }
1151 strcpy(dirp->path, dirname);
1152
1153 fattr = GetFileAttributes(dirp->path);
1154 if (fattr == 0xffffffff) {
1155 free(dirp->path);
1156 free(dirp);
1157 errno = ENOENT;
1158 return 0;
1159 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1160 free(dirp->path);
1161 free(dirp);
1162 errno = ENOTDIR;
1163 return 0;
1164 }
1165
1166 // Append "*.*", or possibly "\\*.*", to path
1167 if (dirp->path[1] == ':' &&
1168 (dirp->path[2] == '\0' ||
1169 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1170 // No '\\' needed for cases like "Z:" or "Z:\"
1171 strcat(dirp->path, "*.*");
1172 } else {
1173 strcat(dirp->path, "\\*.*");
1174 }
1175
1176 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1177 if (dirp->handle == INVALID_HANDLE_VALUE) {
1178 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1179 free(dirp->path);
1180 free(dirp);
1181 errno = EACCES;
1182 return 0;
1183 }
1184 }
1185 return dirp;
1186 }
1187
1188 struct dirent * os::readdir(DIR *dirp) {
1189 assert(dirp != NULL, "just checking"); // hotspot change
1190 if (dirp->handle == INVALID_HANDLE_VALUE) {
1191 return NULL;
1192 }
1193
1194 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1195
1196 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1197 if (GetLastError() == ERROR_INVALID_HANDLE) {
1198 errno = EBADF;
1199 return NULL;
1200 }
1201 FindClose(dirp->handle);
1202 dirp->handle = INVALID_HANDLE_VALUE;
1203 }
1204
1205 return &dirp->dirent;
1206 }
1207
1208 int os::closedir(DIR *dirp) {
1209 assert(dirp != NULL, "just checking"); // hotspot change
1210 if (dirp->handle != INVALID_HANDLE_VALUE) {
1211 if (!FindClose(dirp->handle)) {
1212 errno = EBADF;
1213 return -1;
1214 }
1215 dirp->handle = INVALID_HANDLE_VALUE;
1216 }
1217 free(dirp->path);
1218 free(dirp);
1219 return 0;
1220 }
1221
1222 // This must be hard coded because it's the system's temporary
1223 // directory not the java application's temp directory, ala java.io.tmpdir.
1224 const char* os::get_temp_directory() {
1225 static char path_buf[MAX_PATH];
1226 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1227 return path_buf;
1228 } else {
1229 path_buf[0] = '\0';
1230 return path_buf;
1231 }
1232 }
1233
1234 // Needs to be in os specific directory because windows requires another
1235 // header file <direct.h>
1236 const char* os::get_current_directory(char *buf, size_t buflen) {
1237 int n = static_cast<int>(buflen);
1238 if (buflen > INT_MAX) n = INT_MAX;
1239 return _getcwd(buf, n);
1240 }
1241
1242 //-----------------------------------------------------------
1243 // Helper functions for fatal error handler
1244 #ifdef _WIN64
1245 // Helper routine which returns true if address in
1246 // within the NTDLL address space.
1247 //
1248 static bool _addr_in_ntdll(address addr) {
1249 HMODULE hmod;
1250 MODULEINFO minfo;
1251
1252 hmod = GetModuleHandle("NTDLL.DLL");
1253 if (hmod == NULL) return false;
1254 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1255 &minfo, sizeof(MODULEINFO))) {
1256 return false;
1257 }
1258
1259 if ((addr >= minfo.lpBaseOfDll) &&
1260 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1261 return true;
1262 } else {
1263 return false;
1264 }
1265 }
1266 #endif
1267
1268 struct _modinfo {
1269 address addr;
1270 char* full_path; // point to a char buffer
1271 int buflen; // size of the buffer
1272 address base_addr;
1273 };
1274
1275 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1276 address top_address, void * param) {
1277 struct _modinfo *pmod = (struct _modinfo *)param;
1278 if (!pmod) return -1;
1279
1280 if (base_addr <= pmod->addr &&
1281 top_address > pmod->addr) {
1282 // if a buffer is provided, copy path name to the buffer
1283 if (pmod->full_path) {
1284 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1285 }
1286 pmod->base_addr = base_addr;
1287 return 1;
1288 }
1289 return 0;
1290 }
1291
1292 bool os::dll_address_to_library_name(address addr, char* buf,
1293 int buflen, int* offset) {
1294 // buf is not optional, but offset is optional
1295 assert(buf != NULL, "sanity check");
1296
1297 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1298 // return the full path to the DLL file, sometimes it returns path
1299 // to the corresponding PDB file (debug info); sometimes it only
1300 // returns partial path, which makes life painful.
1301
1302 struct _modinfo mi;
1303 mi.addr = addr;
1304 mi.full_path = buf;
1305 mi.buflen = buflen;
1306 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1307 // buf already contains path name
1308 if (offset) *offset = addr - mi.base_addr;
1309 return true;
1310 }
1311
1312 buf[0] = '\0';
1313 if (offset) *offset = -1;
1314 return false;
1315 }
1316
1317 bool os::dll_address_to_function_name(address addr, char *buf,
1318 int buflen, int *offset,
1319 bool demangle) {
1320 // buf is not optional, but offset is optional
1321 assert(buf != NULL, "sanity check");
1322
1323 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1324 return true;
1325 }
1326 if (offset != NULL) *offset = -1;
1327 buf[0] = '\0';
1328 return false;
1329 }
1330
1331 // save the start and end address of jvm.dll into param[0] and param[1]
1332 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 if (!param) return -1;
1335
1336 if (base_addr <= (address)_locate_jvm_dll &&
1337 top_address > (address)_locate_jvm_dll) {
1338 ((address*)param)[0] = base_addr;
1339 ((address*)param)[1] = top_address;
1340 return 1;
1341 }
1342 return 0;
1343 }
1344
1345 address vm_lib_location[2]; // start and end address of jvm.dll
1346
1347 // check if addr is inside jvm.dll
1348 bool os::address_is_in_vm(address addr) {
1349 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1350 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1351 assert(false, "Can't find jvm module.");
1352 return false;
1353 }
1354 }
1355
1356 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1357 }
1358
1359 // print module info; param is outputStream*
1360 static int _print_module(const char* fname, address base_address,
1361 address top_address, void* param) {
1362 if (!param) return -1;
1363
1364 outputStream* st = (outputStream*)param;
1365
1366 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1367 return 0;
1368 }
1369
1370 // Loads .dll/.so and
1371 // in case of error it checks if .dll/.so was built for the
1372 // same architecture as Hotspot is running on
1373 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1374 log_info(os)("attempting shared library load of %s", name);
1375
1376 void * result = LoadLibrary(name);
1377 if (result != NULL) {
1378 Events::log(NULL, "Loaded shared library %s", name);
1379 // Recalculate pdb search path if a DLL was loaded successfully.
1380 SymbolEngine::recalc_search_path();
1381 log_info(os)("shared library load of %s was successful", name);
1382 return result;
1383 }
1384 DWORD errcode = GetLastError();
1385 // Read system error message into ebuf
1386 // It may or may not be overwritten below (in the for loop and just above)
1387 lasterror(ebuf, (size_t) ebuflen);
1388 ebuf[ebuflen - 1] = '\0';
1389 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1390 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1391
1392 if (errcode == ERROR_MOD_NOT_FOUND) {
1393 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1394 ebuf[ebuflen - 1] = '\0';
1395 return NULL;
1396 }
1397
1398 // Parsing dll below
1399 // If we can read dll-info and find that dll was built
1400 // for an architecture other than Hotspot is running in
1401 // - then print to buffer "DLL was built for a different architecture"
1402 // else call os::lasterror to obtain system error message
1403 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1404 if (fd < 0) {
1405 return NULL;
1406 }
1407
1408 uint32_t signature_offset;
1409 uint16_t lib_arch = 0;
1410 bool failed_to_get_lib_arch =
1411 ( // Go to position 3c in the dll
1412 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1413 ||
1414 // Read location of signature
1415 (sizeof(signature_offset) !=
1416 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1417 ||
1418 // Go to COFF File Header in dll
1419 // that is located after "signature" (4 bytes long)
1420 (os::seek_to_file_offset(fd,
1421 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1422 ||
1423 // Read field that contains code of architecture
1424 // that dll was built for
1425 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1426 );
1427
1428 ::close(fd);
1429 if (failed_to_get_lib_arch) {
1430 // file i/o error - report os::lasterror(...) msg
1431 return NULL;
1432 }
1433
1434 typedef struct {
1435 uint16_t arch_code;
1436 char* arch_name;
1437 } arch_t;
1438
1439 static const arch_t arch_array[] = {
1440 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1441 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1442 };
1443 #if (defined _M_AMD64)
1444 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1445 #elif (defined _M_IX86)
1446 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1447 #else
1448 #error Method os::dll_load requires that one of following \
1449 is defined :_M_AMD64 or _M_IX86
1450 #endif
1451
1452
1453 // Obtain a string for printf operation
1454 // lib_arch_str shall contain string what platform this .dll was built for
1455 // running_arch_str shall string contain what platform Hotspot was built for
1456 char *running_arch_str = NULL, *lib_arch_str = NULL;
1457 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1458 if (lib_arch == arch_array[i].arch_code) {
1459 lib_arch_str = arch_array[i].arch_name;
1460 }
1461 if (running_arch == arch_array[i].arch_code) {
1462 running_arch_str = arch_array[i].arch_name;
1463 }
1464 }
1465
1466 assert(running_arch_str,
1467 "Didn't find running architecture code in arch_array");
1468
1469 // If the architecture is right
1470 // but some other error took place - report os::lasterror(...) msg
1471 if (lib_arch == running_arch) {
1472 return NULL;
1473 }
1474
1475 if (lib_arch_str != NULL) {
1476 ::_snprintf(ebuf, ebuflen - 1,
1477 "Can't load %s-bit .dll on a %s-bit platform",
1478 lib_arch_str, running_arch_str);
1479 } else {
1480 // don't know what architecture this dll was build for
1481 ::_snprintf(ebuf, ebuflen - 1,
1482 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1483 lib_arch, running_arch_str);
1484 }
1485
1486 return NULL;
1487 }
1488
1489 void os::print_dll_info(outputStream *st) {
1490 st->print_cr("Dynamic libraries:");
1491 get_loaded_modules_info(_print_module, (void *)st);
1492 }
1493
1494 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1495 HANDLE hProcess;
1496
1497 # define MAX_NUM_MODULES 128
1498 HMODULE modules[MAX_NUM_MODULES];
1499 static char filename[MAX_PATH];
1500 int result = 0;
1501
1502 int pid = os::current_process_id();
1503 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1504 FALSE, pid);
1505 if (hProcess == NULL) return 0;
1506
1507 DWORD size_needed;
1508 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1509 CloseHandle(hProcess);
1510 return 0;
1511 }
1512
1513 // number of modules that are currently loaded
1514 int num_modules = size_needed / sizeof(HMODULE);
1515
1516 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1517 // Get Full pathname:
1518 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1519 filename[0] = '\0';
1520 }
1521
1522 MODULEINFO modinfo;
1523 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1524 modinfo.lpBaseOfDll = NULL;
1525 modinfo.SizeOfImage = 0;
1526 }
1527
1528 // Invoke callback function
1529 result = callback(filename, (address)modinfo.lpBaseOfDll,
1530 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1531 if (result) break;
1532 }
1533
1534 CloseHandle(hProcess);
1535 return result;
1536 }
1537
1538 bool os::get_host_name(char* buf, size_t buflen) {
1539 DWORD size = (DWORD)buflen;
1540 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1541 }
1542
1543 void os::get_summary_os_info(char* buf, size_t buflen) {
1544 stringStream sst(buf, buflen);
1545 os::win32::print_windows_version(&sst);
1546 // chop off newline character
1547 char* nl = strchr(buf, '\n');
1548 if (nl != NULL) *nl = '\0';
1549 }
1550
1551 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1552 #if _MSC_VER >= 1900
1553 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1554 int result = ::vsnprintf(buf, len, fmt, args);
1555 // If an encoding error occurred (result < 0) then it's not clear
1556 // whether the buffer is NUL terminated, so ensure it is.
1557 if ((result < 0) && (len > 0)) {
1558 buf[len - 1] = '\0';
1559 }
1560 return result;
1561 #else
1562 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1563 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1564 // versions. However, when len == 0, avoid _vsnprintf too, and just
1565 // go straight to _vscprintf. The output is going to be truncated in
1566 // that case, except in the unusual case of empty output. More
1567 // importantly, the documentation for various versions of Visual Studio
1568 // are inconsistent about the behavior of _vsnprintf when len == 0,
1569 // including it possibly being an error.
1570 int result = -1;
1571 if (len > 0) {
1572 result = _vsnprintf(buf, len, fmt, args);
1573 // If output (including NUL terminator) is truncated, the buffer
1574 // won't be NUL terminated. Add the trailing NUL specified by C99.
1575 if ((result < 0) || ((size_t)result >= len)) {
1576 buf[len - 1] = '\0';
1577 }
1578 }
1579 if (result < 0) {
1580 result = _vscprintf(fmt, args);
1581 }
1582 return result;
1583 #endif // _MSC_VER dispatch
1584 }
1585
1586 static inline time_t get_mtime(const char* filename) {
1587 struct stat st;
1588 int ret = os::stat(filename, &st);
1589 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1590 return st.st_mtime;
1591 }
1592
1593 int os::compare_file_modified_times(const char* file1, const char* file2) {
1594 time_t t1 = get_mtime(file1);
1595 time_t t2 = get_mtime(file2);
1596 return t1 - t2;
1597 }
1598
1599 void os::print_os_info_brief(outputStream* st) {
1600 os::print_os_info(st);
1601 }
1602
1603 void os::print_os_info(outputStream* st) {
1604 #ifdef ASSERT
1605 char buffer[1024];
1606 st->print("HostName: ");
1607 if (get_host_name(buffer, sizeof(buffer))) {
1608 st->print("%s ", buffer);
1609 } else {
1610 st->print("N/A ");
1611 }
1612 #endif
1613 st->print("OS:");
1614 os::win32::print_windows_version(st);
1615
1616 #ifdef _LP64
1617 VM_Version::print_platform_virtualization_info(st);
1618 #endif
1619 }
1620
1621 void os::win32::print_windows_version(outputStream* st) {
1622 OSVERSIONINFOEX osvi;
1623 VS_FIXEDFILEINFO *file_info;
1624 TCHAR kernel32_path[MAX_PATH];
1625 UINT len, ret;
1626
1627 // Use the GetVersionEx information to see if we're on a server or
1628 // workstation edition of Windows. Starting with Windows 8.1 we can't
1629 // trust the OS version information returned by this API.
1630 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1631 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1632 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1633 st->print_cr("Call to GetVersionEx failed");
1634 return;
1635 }
1636 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1637
1638 // Get the full path to \Windows\System32\kernel32.dll and use that for
1639 // determining what version of Windows we're running on.
1640 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1641 ret = GetSystemDirectory(kernel32_path, len);
1642 if (ret == 0 || ret > len) {
1643 st->print_cr("Call to GetSystemDirectory failed");
1644 return;
1645 }
1646 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1647
1648 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1649 if (version_size == 0) {
1650 st->print_cr("Call to GetFileVersionInfoSize failed");
1651 return;
1652 }
1653
1654 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1655 if (version_info == NULL) {
1656 st->print_cr("Failed to allocate version_info");
1657 return;
1658 }
1659
1660 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1661 os::free(version_info);
1662 st->print_cr("Call to GetFileVersionInfo failed");
1663 return;
1664 }
1665
1666 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1667 os::free(version_info);
1668 st->print_cr("Call to VerQueryValue failed");
1669 return;
1670 }
1671
1672 int major_version = HIWORD(file_info->dwProductVersionMS);
1673 int minor_version = LOWORD(file_info->dwProductVersionMS);
1674 int build_number = HIWORD(file_info->dwProductVersionLS);
1675 int build_minor = LOWORD(file_info->dwProductVersionLS);
1676 int os_vers = major_version * 1000 + minor_version;
1677 os::free(version_info);
1678
1679 st->print(" Windows ");
1680 switch (os_vers) {
1681
1682 case 6000:
1683 if (is_workstation) {
1684 st->print("Vista");
1685 } else {
1686 st->print("Server 2008");
1687 }
1688 break;
1689
1690 case 6001:
1691 if (is_workstation) {
1692 st->print("7");
1693 } else {
1694 st->print("Server 2008 R2");
1695 }
1696 break;
1697
1698 case 6002:
1699 if (is_workstation) {
1700 st->print("8");
1701 } else {
1702 st->print("Server 2012");
1703 }
1704 break;
1705
1706 case 6003:
1707 if (is_workstation) {
1708 st->print("8.1");
1709 } else {
1710 st->print("Server 2012 R2");
1711 }
1712 break;
1713
1714 case 10000:
1715 if (is_workstation) {
1716 st->print("10");
1717 } else {
1718 // distinguish Windows Server 2016 and 2019 by build number
1719 // Windows server 2019 GA 10/2018 build number is 17763
1720 if (build_number > 17762) {
1721 st->print("Server 2019");
1722 } else {
1723 st->print("Server 2016");
1724 }
1725 }
1726 break;
1727
1728 default:
1729 // Unrecognized windows, print out its major and minor versions
1730 st->print("%d.%d", major_version, minor_version);
1731 break;
1732 }
1733
1734 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1735 // find out whether we are running on 64 bit processor or not
1736 SYSTEM_INFO si;
1737 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1738 GetNativeSystemInfo(&si);
1739 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1740 st->print(" , 64 bit");
1741 }
1742
1743 st->print(" Build %d", build_number);
1744 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1745 st->cr();
1746 }
1747
1748 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1749 // Nothing to do for now.
1750 }
1751
1752 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1753 HKEY key;
1754 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1755 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1756 if (status == ERROR_SUCCESS) {
1757 DWORD size = (DWORD)buflen;
1758 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1759 if (status != ERROR_SUCCESS) {
1760 strncpy(buf, "## __CPU__", buflen);
1761 }
1762 RegCloseKey(key);
1763 } else {
1764 // Put generic cpu info to return
1765 strncpy(buf, "## __CPU__", buflen);
1766 }
1767 }
1768
1769 void os::print_memory_info(outputStream* st) {
1770 st->print("Memory:");
1771 st->print(" %dk page", os::vm_page_size()>>10);
1772
1773 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1774 // value if total memory is larger than 4GB
1775 MEMORYSTATUSEX ms;
1776 ms.dwLength = sizeof(ms);
1777 int r1 = GlobalMemoryStatusEx(&ms);
1778
1779 if (r1 != 0) {
1780 st->print(", system-wide physical " INT64_FORMAT "M ",
1781 (int64_t) ms.ullTotalPhys >> 20);
1782 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1783
1784 st->print("TotalPageFile size " INT64_FORMAT "M ",
1785 (int64_t) ms.ullTotalPageFile >> 20);
1786 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1787 (int64_t) ms.ullAvailPageFile >> 20);
1788
1789 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1790 #if defined(_M_IX86)
1791 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1792 (int64_t) ms.ullTotalVirtual >> 20);
1793 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1794 #endif
1795 } else {
1796 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1797 }
1798
1799 // extended memory statistics for a process
1800 PROCESS_MEMORY_COUNTERS_EX pmex;
1801 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1802 pmex.cb = sizeof(pmex);
1803 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1804
1805 if (r2 != 0) {
1806 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1807 (int64_t) pmex.WorkingSetSize >> 20);
1808 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1809
1810 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1811 (int64_t) pmex.PrivateUsage >> 20);
1812 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1813 } else {
1814 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1815 }
1816
1817 st->cr();
1818 }
1819
1820 bool os::signal_sent_by_kill(const void* siginfo) {
1821 // TODO: Is this possible?
1822 return false;
1823 }
1824
1825 void os::print_siginfo(outputStream *st, const void* siginfo) {
1826 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1827 st->print("siginfo:");
1828
1829 char tmp[64];
1830 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1831 strcpy(tmp, "EXCEPTION_??");
1832 }
1833 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1834
1835 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1836 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1837 er->NumberParameters >= 2) {
1838 switch (er->ExceptionInformation[0]) {
1839 case 0: st->print(", reading address"); break;
1840 case 1: st->print(", writing address"); break;
1841 case 8: st->print(", data execution prevention violation at address"); break;
1842 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1843 er->ExceptionInformation[0]);
1844 }
1845 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1846 } else {
1847 int num = er->NumberParameters;
1848 if (num > 0) {
1849 st->print(", ExceptionInformation=");
1850 for (int i = 0; i < num; i++) {
1851 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1852 }
1853 }
1854 }
1855 st->cr();
1856 }
1857
1858 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1859 // TODO: Can we kill thread?
1860 return false;
1861 }
1862
1863 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1864 // do nothing
1865 }
1866
1867 static char saved_jvm_path[MAX_PATH] = {0};
1868
1869 // Find the full path to the current module, jvm.dll
1870 void os::jvm_path(char *buf, jint buflen) {
1871 // Error checking.
1872 if (buflen < MAX_PATH) {
1873 assert(false, "must use a large-enough buffer");
1874 buf[0] = '\0';
1875 return;
1876 }
1877 // Lazy resolve the path to current module.
1878 if (saved_jvm_path[0] != 0) {
1879 strcpy(buf, saved_jvm_path);
1880 return;
1881 }
1882
1883 buf[0] = '\0';
1884 if (Arguments::sun_java_launcher_is_altjvm()) {
1885 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1886 // for a JAVA_HOME environment variable and fix up the path so it
1887 // looks like jvm.dll is installed there (append a fake suffix
1888 // hotspot/jvm.dll).
1889 char* java_home_var = ::getenv("JAVA_HOME");
1890 if (java_home_var != NULL && java_home_var[0] != 0 &&
1891 strlen(java_home_var) < (size_t)buflen) {
1892 strncpy(buf, java_home_var, buflen);
1893
1894 // determine if this is a legacy image or modules image
1895 // modules image doesn't have "jre" subdirectory
1896 size_t len = strlen(buf);
1897 char* jrebin_p = buf + len;
1898 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1899 if (0 != _access(buf, 0)) {
1900 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1901 }
1902 len = strlen(buf);
1903 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1904 }
1905 }
1906
1907 if (buf[0] == '\0') {
1908 GetModuleFileName(vm_lib_handle, buf, buflen);
1909 }
1910 strncpy(saved_jvm_path, buf, MAX_PATH);
1911 saved_jvm_path[MAX_PATH - 1] = '\0';
1912 }
1913
1914
1915 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1916 #ifndef _WIN64
1917 st->print("_");
1918 #endif
1919 }
1920
1921
1922 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1923 #ifndef _WIN64
1924 st->print("@%d", args_size * sizeof(int));
1925 #endif
1926 }
1927
1928 // This method is a copy of JDK's sysGetLastErrorString
1929 // from src/windows/hpi/src/system_md.c
1930
1931 size_t os::lasterror(char* buf, size_t len) {
1932 DWORD errval;
1933
1934 if ((errval = GetLastError()) != 0) {
1935 // DOS error
1936 size_t n = (size_t)FormatMessage(
1937 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1938 NULL,
1939 errval,
1940 0,
1941 buf,
1942 (DWORD)len,
1943 NULL);
1944 if (n > 3) {
1945 // Drop final '.', CR, LF
1946 if (buf[n - 1] == '\n') n--;
1947 if (buf[n - 1] == '\r') n--;
1948 if (buf[n - 1] == '.') n--;
1949 buf[n] = '\0';
1950 }
1951 return n;
1952 }
1953
1954 if (errno != 0) {
1955 // C runtime error that has no corresponding DOS error code
1956 const char* s = os::strerror(errno);
1957 size_t n = strlen(s);
1958 if (n >= len) n = len - 1;
1959 strncpy(buf, s, n);
1960 buf[n] = '\0';
1961 return n;
1962 }
1963
1964 return 0;
1965 }
1966
1967 int os::get_last_error() {
1968 DWORD error = GetLastError();
1969 if (error == 0) {
1970 error = errno;
1971 }
1972 return (int)error;
1973 }
1974
1975 // sun.misc.Signal
1976 // NOTE that this is a workaround for an apparent kernel bug where if
1977 // a signal handler for SIGBREAK is installed then that signal handler
1978 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1979 // See bug 4416763.
1980 static void (*sigbreakHandler)(int) = NULL;
1981
1982 static void UserHandler(int sig, void *siginfo, void *context) {
1983 os::signal_notify(sig);
1984 // We need to reinstate the signal handler each time...
1985 os::signal(sig, (void*)UserHandler);
1986 }
1987
1988 void* os::user_handler() {
1989 return (void*) UserHandler;
1990 }
1991
1992 void* os::signal(int signal_number, void* handler) {
1993 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1994 void (*oldHandler)(int) = sigbreakHandler;
1995 sigbreakHandler = (void (*)(int)) handler;
1996 return (void*) oldHandler;
1997 } else {
1998 return (void*)::signal(signal_number, (void (*)(int))handler);
1999 }
2000 }
2001
2002 void os::signal_raise(int signal_number) {
2003 raise(signal_number);
2004 }
2005
2006 // The Win32 C runtime library maps all console control events other than ^C
2007 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2008 // logoff, and shutdown events. We therefore install our own console handler
2009 // that raises SIGTERM for the latter cases.
2010 //
2011 static BOOL WINAPI consoleHandler(DWORD event) {
2012 switch (event) {
2013 case CTRL_C_EVENT:
2014 if (VMError::is_error_reported()) {
2015 // Ctrl-C is pressed during error reporting, likely because the error
2016 // handler fails to abort. Let VM die immediately.
2017 os::die();
2018 }
2019
2020 os::signal_raise(SIGINT);
2021 return TRUE;
2022 break;
2023 case CTRL_BREAK_EVENT:
2024 if (sigbreakHandler != NULL) {
2025 (*sigbreakHandler)(SIGBREAK);
2026 }
2027 return TRUE;
2028 break;
2029 case CTRL_LOGOFF_EVENT: {
2030 // Don't terminate JVM if it is running in a non-interactive session,
2031 // such as a service process.
2032 USEROBJECTFLAGS flags;
2033 HANDLE handle = GetProcessWindowStation();
2034 if (handle != NULL &&
2035 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2036 sizeof(USEROBJECTFLAGS), NULL)) {
2037 // If it is a non-interactive session, let next handler to deal
2038 // with it.
2039 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2040 return FALSE;
2041 }
2042 }
2043 }
2044 case CTRL_CLOSE_EVENT:
2045 case CTRL_SHUTDOWN_EVENT:
2046 os::signal_raise(SIGTERM);
2047 return TRUE;
2048 break;
2049 default:
2050 break;
2051 }
2052 return FALSE;
2053 }
2054
2055 // The following code is moved from os.cpp for making this
2056 // code platform specific, which it is by its very nature.
2057
2058 // Return maximum OS signal used + 1 for internal use only
2059 // Used as exit signal for signal_thread
2060 int os::sigexitnum_pd() {
2061 return NSIG;
2062 }
2063
2064 // a counter for each possible signal value, including signal_thread exit signal
2065 static volatile jint pending_signals[NSIG+1] = { 0 };
2066 static Semaphore* sig_sem = NULL;
2067
2068 static void jdk_misc_signal_init() {
2069 // Initialize signal structures
2070 memset((void*)pending_signals, 0, sizeof(pending_signals));
2071
2072 // Initialize signal semaphore
2073 sig_sem = new Semaphore();
2074
2075 // Programs embedding the VM do not want it to attempt to receive
2076 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2077 // shutdown hooks mechanism introduced in 1.3. For example, when
2078 // the VM is run as part of a Windows NT service (i.e., a servlet
2079 // engine in a web server), the correct behavior is for any console
2080 // control handler to return FALSE, not TRUE, because the OS's
2081 // "final" handler for such events allows the process to continue if
2082 // it is a service (while terminating it if it is not a service).
2083 // To make this behavior uniform and the mechanism simpler, we
2084 // completely disable the VM's usage of these console events if -Xrs
2085 // (=ReduceSignalUsage) is specified. This means, for example, that
2086 // the CTRL-BREAK thread dump mechanism is also disabled in this
2087 // case. See bugs 4323062, 4345157, and related bugs.
2088
2089 // Add a CTRL-C handler
2090 SetConsoleCtrlHandler(consoleHandler, TRUE);
2091 }
2092
2093 void os::signal_notify(int sig) {
2094 if (sig_sem != NULL) {
2095 Atomic::inc(&pending_signals[sig]);
2096 sig_sem->signal();
2097 } else {
2098 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2099 // initialization isn't called.
2100 assert(ReduceSignalUsage, "signal semaphore should be created");
2101 }
2102 }
2103
2104 static int check_pending_signals() {
2105 while (true) {
2106 for (int i = 0; i < NSIG + 1; i++) {
2107 jint n = pending_signals[i];
2108 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2109 return i;
2110 }
2111 }
2112 JavaThread *thread = JavaThread::current();
2113
2114 ThreadBlockInVM tbivm(thread);
2115
2116 bool threadIsSuspended;
2117 do {
2118 thread->set_suspend_equivalent();
2119 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2120 sig_sem->wait();
2121
2122 // were we externally suspended while we were waiting?
2123 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2124 if (threadIsSuspended) {
2125 // The semaphore has been incremented, but while we were waiting
2126 // another thread suspended us. We don't want to continue running
2127 // while suspended because that would surprise the thread that
2128 // suspended us.
2129 sig_sem->signal();
2130
2131 thread->java_suspend_self();
2132 }
2133 } while (threadIsSuspended);
2134 }
2135 }
2136
2137 int os::signal_wait() {
2138 return check_pending_signals();
2139 }
2140
2141 // Implicit OS exception handling
2142
2143 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2144 address handler) {
2145 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2146 // Save pc in thread
2147 #ifdef _M_AMD64
2148 // Do not blow up if no thread info available.
2149 if (thread) {
2150 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2151 }
2152 // Set pc to handler
2153 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2154 #else
2155 // Do not blow up if no thread info available.
2156 if (thread) {
2157 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2158 }
2159 // Set pc to handler
2160 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2161 #endif
2162
2163 // Continue the execution
2164 return EXCEPTION_CONTINUE_EXECUTION;
2165 }
2166
2167
2168 // Used for PostMortemDump
2169 extern "C" void safepoints();
2170 extern "C" void find(int x);
2171 extern "C" void events();
2172
2173 // According to Windows API documentation, an illegal instruction sequence should generate
2174 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2175 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2176 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2177
2178 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2179
2180 // From "Execution Protection in the Windows Operating System" draft 0.35
2181 // Once a system header becomes available, the "real" define should be
2182 // included or copied here.
2183 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2184
2185 // Windows Vista/2008 heap corruption check
2186 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2187
2188 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2189 // C++ compiler contain this error code. Because this is a compiler-generated
2190 // error, the code is not listed in the Win32 API header files.
2191 // The code is actually a cryptic mnemonic device, with the initial "E"
2192 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2193 // ASCII values of "msc".
2194
2195 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2196
2197 #define def_excpt(val) { #val, (val) }
2198
2199 static const struct { const char* name; uint number; } exceptlabels[] = {
2200 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2201 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2202 def_excpt(EXCEPTION_BREAKPOINT),
2203 def_excpt(EXCEPTION_SINGLE_STEP),
2204 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2205 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2206 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2207 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2208 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2209 def_excpt(EXCEPTION_FLT_OVERFLOW),
2210 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2211 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2212 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2213 def_excpt(EXCEPTION_INT_OVERFLOW),
2214 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2215 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2216 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2217 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2218 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2219 def_excpt(EXCEPTION_STACK_OVERFLOW),
2220 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2221 def_excpt(EXCEPTION_GUARD_PAGE),
2222 def_excpt(EXCEPTION_INVALID_HANDLE),
2223 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2224 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2225 };
2226
2227 #undef def_excpt
2228
2229 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2230 uint code = static_cast<uint>(exception_code);
2231 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2232 if (exceptlabels[i].number == code) {
2233 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2234 return buf;
2235 }
2236 }
2237
2238 return NULL;
2239 }
2240
2241 //-----------------------------------------------------------------------------
2242 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2243 // handle exception caused by idiv; should only happen for -MinInt/-1
2244 // (division by zero is handled explicitly)
2245 #ifdef _M_AMD64
2246 PCONTEXT ctx = exceptionInfo->ContextRecord;
2247 address pc = (address)ctx->Rip;
2248 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2249 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2250 if (pc[0] == 0xF7) {
2251 // set correct result values and continue after idiv instruction
2252 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2253 } else {
2254 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2255 }
2256 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2257 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2258 // idiv opcode (0xF7).
2259 ctx->Rdx = (DWORD)0; // remainder
2260 // Continue the execution
2261 #else
2262 PCONTEXT ctx = exceptionInfo->ContextRecord;
2263 address pc = (address)ctx->Eip;
2264 assert(pc[0] == 0xF7, "not an idiv opcode");
2265 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2266 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2267 // set correct result values and continue after idiv instruction
2268 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2269 ctx->Eax = (DWORD)min_jint; // result
2270 ctx->Edx = (DWORD)0; // remainder
2271 // Continue the execution
2272 #endif
2273 return EXCEPTION_CONTINUE_EXECUTION;
2274 }
2275
2276 //-----------------------------------------------------------------------------
2277 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2278 PCONTEXT ctx = exceptionInfo->ContextRecord;
2279 #ifndef _WIN64
2280 // handle exception caused by native method modifying control word
2281 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2282
2283 switch (exception_code) {
2284 case EXCEPTION_FLT_DENORMAL_OPERAND:
2285 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2286 case EXCEPTION_FLT_INEXACT_RESULT:
2287 case EXCEPTION_FLT_INVALID_OPERATION:
2288 case EXCEPTION_FLT_OVERFLOW:
2289 case EXCEPTION_FLT_STACK_CHECK:
2290 case EXCEPTION_FLT_UNDERFLOW:
2291 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2292 if (fp_control_word != ctx->FloatSave.ControlWord) {
2293 // Restore FPCW and mask out FLT exceptions
2294 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2295 // Mask out pending FLT exceptions
2296 ctx->FloatSave.StatusWord &= 0xffffff00;
2297 return EXCEPTION_CONTINUE_EXECUTION;
2298 }
2299 }
2300
2301 if (prev_uef_handler != NULL) {
2302 // We didn't handle this exception so pass it to the previous
2303 // UnhandledExceptionFilter.
2304 return (prev_uef_handler)(exceptionInfo);
2305 }
2306 #else // !_WIN64
2307 // On Windows, the mxcsr control bits are non-volatile across calls
2308 // See also CR 6192333
2309 //
2310 jint MxCsr = INITIAL_MXCSR;
2311 // we can't use StubRoutines::addr_mxcsr_std()
2312 // because in Win64 mxcsr is not saved there
2313 if (MxCsr != ctx->MxCsr) {
2314 ctx->MxCsr = MxCsr;
2315 return EXCEPTION_CONTINUE_EXECUTION;
2316 }
2317 #endif // !_WIN64
2318
2319 return EXCEPTION_CONTINUE_SEARCH;
2320 }
2321
2322 static inline void report_error(Thread* t, DWORD exception_code,
2323 address addr, void* siginfo, void* context) {
2324 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2325
2326 // If UseOsErrorReporting, this will return here and save the error file
2327 // somewhere where we can find it in the minidump.
2328 }
2329
2330 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2331 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2332 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2333 address addr = (address) exceptionRecord->ExceptionInformation[1];
2334 if (Interpreter::contains(pc)) {
2335 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2336 if (!fr->is_first_java_frame()) {
2337 // get_frame_at_stack_banging_point() is only called when we
2338 // have well defined stacks so java_sender() calls do not need
2339 // to assert safe_for_sender() first.
2340 *fr = fr->java_sender();
2341 }
2342 } else {
2343 // more complex code with compiled code
2344 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2345 CodeBlob* cb = CodeCache::find_blob(pc);
2346 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2347 // Not sure where the pc points to, fallback to default
2348 // stack overflow handling
2349 return false;
2350 } else {
2351 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2352 // in compiled code, the stack banging is performed just after the return pc
2353 // has been pushed on the stack
2354 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2355 if (!fr->is_java_frame()) {
2356 // See java_sender() comment above.
2357 *fr = fr->java_sender();
2358 }
2359 }
2360 }
2361 assert(fr->is_java_frame(), "Safety check");
2362 return true;
2363 }
2364
2365 #if INCLUDE_AOT
2366 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2367 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2368 address addr = (address) exceptionRecord->ExceptionInformation[1];
2369 address pc = (address) exceptionInfo->ContextRecord->Rip;
2370
2371 // Handle the case where we get an implicit exception in AOT generated
2372 // code. AOT DLL's loaded are not registered for structured exceptions.
2373 // If the exception occurred in the codeCache or AOT code, pass control
2374 // to our normal exception handler.
2375 CodeBlob* cb = CodeCache::find_blob(pc);
2376 if (cb != NULL) {
2377 return topLevelExceptionFilter(exceptionInfo);
2378 }
2379
2380 return EXCEPTION_CONTINUE_SEARCH;
2381 }
2382 #endif
2383
2384 //-----------------------------------------------------------------------------
2385 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2386 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2387 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2388 #ifdef _M_AMD64
2389 address pc = (address) exceptionInfo->ContextRecord->Rip;
2390 #else
2391 address pc = (address) exceptionInfo->ContextRecord->Eip;
2392 #endif
2393 Thread* t = Thread::current_or_null_safe();
2394
2395 // Handle SafeFetch32 and SafeFetchN exceptions.
2396 if (StubRoutines::is_safefetch_fault(pc)) {
2397 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2398 }
2399
2400 #ifndef _WIN64
2401 // Execution protection violation - win32 running on AMD64 only
2402 // Handled first to avoid misdiagnosis as a "normal" access violation;
2403 // This is safe to do because we have a new/unique ExceptionInformation
2404 // code for this condition.
2405 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2406 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2407 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2408 address addr = (address) exceptionRecord->ExceptionInformation[1];
2409
2410 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2411 int page_size = os::vm_page_size();
2412
2413 // Make sure the pc and the faulting address are sane.
2414 //
2415 // If an instruction spans a page boundary, and the page containing
2416 // the beginning of the instruction is executable but the following
2417 // page is not, the pc and the faulting address might be slightly
2418 // different - we still want to unguard the 2nd page in this case.
2419 //
2420 // 15 bytes seems to be a (very) safe value for max instruction size.
2421 bool pc_is_near_addr =
2422 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2423 bool instr_spans_page_boundary =
2424 (align_down((intptr_t) pc ^ (intptr_t) addr,
2425 (intptr_t) page_size) > 0);
2426
2427 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2428 static volatile address last_addr =
2429 (address) os::non_memory_address_word();
2430
2431 // In conservative mode, don't unguard unless the address is in the VM
2432 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2433 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2434
2435 // Set memory to RWX and retry
2436 address page_start = align_down(addr, page_size);
2437 bool res = os::protect_memory((char*) page_start, page_size,
2438 os::MEM_PROT_RWX);
2439
2440 log_debug(os)("Execution protection violation "
2441 "at " INTPTR_FORMAT
2442 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2443 p2i(page_start), (res ? "success" : os::strerror(errno)));
2444
2445 // Set last_addr so if we fault again at the same address, we don't
2446 // end up in an endless loop.
2447 //
2448 // There are two potential complications here. Two threads trapping
2449 // at the same address at the same time could cause one of the
2450 // threads to think it already unguarded, and abort the VM. Likely
2451 // very rare.
2452 //
2453 // The other race involves two threads alternately trapping at
2454 // different addresses and failing to unguard the page, resulting in
2455 // an endless loop. This condition is probably even more unlikely
2456 // than the first.
2457 //
2458 // Although both cases could be avoided by using locks or thread
2459 // local last_addr, these solutions are unnecessary complication:
2460 // this handler is a best-effort safety net, not a complete solution.
2461 // It is disabled by default and should only be used as a workaround
2462 // in case we missed any no-execute-unsafe VM code.
2463
2464 last_addr = addr;
2465
2466 return EXCEPTION_CONTINUE_EXECUTION;
2467 }
2468 }
2469
2470 // Last unguard failed or not unguarding
2471 tty->print_raw_cr("Execution protection violation");
2472 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2473 exceptionInfo->ContextRecord);
2474 return EXCEPTION_CONTINUE_SEARCH;
2475 }
2476 }
2477 #endif // _WIN64
2478
2479 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2480 VM_Version::is_cpuinfo_segv_addr(pc)) {
2481 // Verify that OS save/restore AVX registers.
2482 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2483 }
2484
2485 if (t != NULL && t->is_Java_thread()) {
2486 JavaThread* thread = (JavaThread*) t;
2487 bool in_java = thread->thread_state() == _thread_in_Java;
2488
2489 // Handle potential stack overflows up front.
2490 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2491 if (thread->stack_guards_enabled()) {
2492 if (in_java) {
2493 frame fr;
2494 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2495 address addr = (address) exceptionRecord->ExceptionInformation[1];
2496 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2497 assert(fr.is_java_frame(), "Must be a Java frame");
2498 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2499 }
2500 }
2501 // Yellow zone violation. The o/s has unprotected the first yellow
2502 // zone page for us. Note: must call disable_stack_yellow_zone to
2503 // update the enabled status, even if the zone contains only one page.
2504 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2505 thread->disable_stack_yellow_reserved_zone();
2506 // If not in java code, return and hope for the best.
2507 return in_java
2508 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2509 : EXCEPTION_CONTINUE_EXECUTION;
2510 } else {
2511 // Fatal red zone violation.
2512 thread->disable_stack_red_zone();
2513 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2514 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2515 exceptionInfo->ContextRecord);
2516 return EXCEPTION_CONTINUE_SEARCH;
2517 }
2518 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2519 // Either stack overflow or null pointer exception.
2520 if (in_java) {
2521 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2522 address addr = (address) exceptionRecord->ExceptionInformation[1];
2523 address stack_end = thread->stack_end();
2524 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2525 // Stack overflow.
2526 assert(!os::uses_stack_guard_pages(),
2527 "should be caught by red zone code above.");
2528 return Handle_Exception(exceptionInfo,
2529 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2530 }
2531 // Check for safepoint polling and implicit null
2532 // We only expect null pointers in the stubs (vtable)
2533 // the rest are checked explicitly now.
2534 CodeBlob* cb = CodeCache::find_blob(pc);
2535 if (cb != NULL) {
2536 if (os::is_poll_address(addr)) {
2537 address stub = SharedRuntime::get_poll_stub(pc);
2538 return Handle_Exception(exceptionInfo, stub);
2539 }
2540 }
2541 {
2542 #ifdef _WIN64
2543 // If it's a legal stack address map the entire region in
2544 //
2545 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2546 address addr = (address) exceptionRecord->ExceptionInformation[1];
2547 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2548 addr = (address)((uintptr_t)addr &
2549 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2550 os::commit_memory((char *)addr, thread->stack_base() - addr,
2551 !ExecMem);
2552 return EXCEPTION_CONTINUE_EXECUTION;
2553 } else
2554 #endif
2555 {
2556 // Null pointer exception.
2557 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2558 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2559 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2560 }
2561 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2562 exceptionInfo->ContextRecord);
2563 return EXCEPTION_CONTINUE_SEARCH;
2564 }
2565 }
2566 }
2567
2568 #ifdef _WIN64
2569 // Special care for fast JNI field accessors.
2570 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2571 // in and the heap gets shrunk before the field access.
2572 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2573 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2574 if (addr != (address)-1) {
2575 return Handle_Exception(exceptionInfo, addr);
2576 }
2577 }
2578 #endif
2579
2580 // Stack overflow or null pointer exception in native code.
2581 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2582 exceptionInfo->ContextRecord);
2583 return EXCEPTION_CONTINUE_SEARCH;
2584 } // /EXCEPTION_ACCESS_VIOLATION
2585 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2586
2587 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2588 CompiledMethod* nm = NULL;
2589 JavaThread* thread = (JavaThread*)t;
2590 if (in_java) {
2591 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2592 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2593 }
2594
2595 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2596 if (((thread->thread_state() == _thread_in_vm ||
2597 thread->thread_state() == _thread_in_native ||
2598 is_unsafe_arraycopy) &&
2599 thread->doing_unsafe_access()) ||
2600 (nm != NULL && nm->has_unsafe_access())) {
2601 address next_pc = Assembler::locate_next_instruction(pc);
2602 if (is_unsafe_arraycopy) {
2603 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2604 }
2605 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2606 }
2607 }
2608
2609 if (in_java) {
2610 switch (exception_code) {
2611 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2612 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2613
2614 case EXCEPTION_INT_OVERFLOW:
2615 return Handle_IDiv_Exception(exceptionInfo);
2616
2617 } // switch
2618 }
2619 if (((thread->thread_state() == _thread_in_Java) ||
2620 (thread->thread_state() == _thread_in_native)) &&
2621 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2622 LONG result=Handle_FLT_Exception(exceptionInfo);
2623 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2624 }
2625 }
2626
2627 if (exception_code != EXCEPTION_BREAKPOINT) {
2628 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2629 exceptionInfo->ContextRecord);
2630 }
2631 return EXCEPTION_CONTINUE_SEARCH;
2632 }
2633
2634 #ifndef _WIN64
2635 // Special care for fast JNI accessors.
2636 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2637 // the heap gets shrunk before the field access.
2638 // Need to install our own structured exception handler since native code may
2639 // install its own.
2640 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2641 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2642 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2643 address pc = (address) exceptionInfo->ContextRecord->Eip;
2644 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2645 if (addr != (address)-1) {
2646 return Handle_Exception(exceptionInfo, addr);
2647 }
2648 }
2649 return EXCEPTION_CONTINUE_SEARCH;
2650 }
2651
2652 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2653 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2654 jobject obj, \
2655 jfieldID fieldID) { \
2656 __try { \
2657 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2658 obj, \
2659 fieldID); \
2660 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2661 _exception_info())) { \
2662 } \
2663 return 0; \
2664 }
2665
2666 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2667 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2668 DEFINE_FAST_GETFIELD(jchar, char, Char)
2669 DEFINE_FAST_GETFIELD(jshort, short, Short)
2670 DEFINE_FAST_GETFIELD(jint, int, Int)
2671 DEFINE_FAST_GETFIELD(jlong, long, Long)
2672 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2673 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2674
2675 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2676 switch (type) {
2677 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2678 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2679 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2680 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2681 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2682 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2683 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2684 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2685 default: ShouldNotReachHere();
2686 }
2687 return (address)-1;
2688 }
2689 #endif
2690
2691 // Virtual Memory
2692
2693 int os::vm_page_size() { return os::win32::vm_page_size(); }
2694 int os::vm_allocation_granularity() {
2695 return os::win32::vm_allocation_granularity();
2696 }
2697
2698 // Windows large page support is available on Windows 2003. In order to use
2699 // large page memory, the administrator must first assign additional privilege
2700 // to the user:
2701 // + select Control Panel -> Administrative Tools -> Local Security Policy
2702 // + select Local Policies -> User Rights Assignment
2703 // + double click "Lock pages in memory", add users and/or groups
2704 // + reboot
2705 // Note the above steps are needed for administrator as well, as administrators
2706 // by default do not have the privilege to lock pages in memory.
2707 //
2708 // Note about Windows 2003: although the API supports committing large page
2709 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2710 // scenario, I found through experiment it only uses large page if the entire
2711 // memory region is reserved and committed in a single VirtualAlloc() call.
2712 // This makes Windows large page support more or less like Solaris ISM, in
2713 // that the entire heap must be committed upfront. This probably will change
2714 // in the future, if so the code below needs to be revisited.
2715
2716 #ifndef MEM_LARGE_PAGES
2717 #define MEM_LARGE_PAGES 0x20000000
2718 #endif
2719
2720 static HANDLE _hProcess;
2721 static HANDLE _hToken;
2722
2723 // Container for NUMA node list info
2724 class NUMANodeListHolder {
2725 private:
2726 int *_numa_used_node_list; // allocated below
2727 int _numa_used_node_count;
2728
2729 void free_node_list() {
2730 if (_numa_used_node_list != NULL) {
2731 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2732 }
2733 }
2734
2735 public:
2736 NUMANodeListHolder() {
2737 _numa_used_node_count = 0;
2738 _numa_used_node_list = NULL;
2739 // do rest of initialization in build routine (after function pointers are set up)
2740 }
2741
2742 ~NUMANodeListHolder() {
2743 free_node_list();
2744 }
2745
2746 bool build() {
2747 DWORD_PTR proc_aff_mask;
2748 DWORD_PTR sys_aff_mask;
2749 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2750 ULONG highest_node_number;
2751 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2752 free_node_list();
2753 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2754 for (unsigned int i = 0; i <= highest_node_number; i++) {
2755 ULONGLONG proc_mask_numa_node;
2756 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2757 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2758 _numa_used_node_list[_numa_used_node_count++] = i;
2759 }
2760 }
2761 return (_numa_used_node_count > 1);
2762 }
2763
2764 int get_count() { return _numa_used_node_count; }
2765 int get_node_list_entry(int n) {
2766 // for indexes out of range, returns -1
2767 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2768 }
2769
2770 } numa_node_list_holder;
2771
2772
2773
2774 static size_t _large_page_size = 0;
2775
2776 static bool request_lock_memory_privilege() {
2777 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2778 os::current_process_id());
2779
2780 LUID luid;
2781 if (_hProcess != NULL &&
2782 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2783 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2784
2785 TOKEN_PRIVILEGES tp;
2786 tp.PrivilegeCount = 1;
2787 tp.Privileges[0].Luid = luid;
2788 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2789
2790 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2791 // privilege. Check GetLastError() too. See MSDN document.
2792 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2793 (GetLastError() == ERROR_SUCCESS)) {
2794 return true;
2795 }
2796 }
2797
2798 return false;
2799 }
2800
2801 static void cleanup_after_large_page_init() {
2802 if (_hProcess) CloseHandle(_hProcess);
2803 _hProcess = NULL;
2804 if (_hToken) CloseHandle(_hToken);
2805 _hToken = NULL;
2806 }
2807
2808 static bool numa_interleaving_init() {
2809 bool success = false;
2810 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2811
2812 // print a warning if UseNUMAInterleaving flag is specified on command line
2813 bool warn_on_failure = use_numa_interleaving_specified;
2814 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2815
2816 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2817 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2818 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2819
2820 if (numa_node_list_holder.build()) {
2821 if (log_is_enabled(Debug, os, cpu)) {
2822 Log(os, cpu) log;
2823 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2824 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2825 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2826 }
2827 }
2828 success = true;
2829 } else {
2830 WARN("Process does not cover multiple NUMA nodes.");
2831 }
2832 if (!success) {
2833 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2834 }
2835 return success;
2836 #undef WARN
2837 }
2838
2839 // this routine is used whenever we need to reserve a contiguous VA range
2840 // but we need to make separate VirtualAlloc calls for each piece of the range
2841 // Reasons for doing this:
2842 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2843 // * UseNUMAInterleaving requires a separate node for each piece
2844 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2845 DWORD prot,
2846 bool should_inject_error = false) {
2847 char * p_buf;
2848 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2849 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2850 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2851
2852 // first reserve enough address space in advance since we want to be
2853 // able to break a single contiguous virtual address range into multiple
2854 // large page commits but WS2003 does not allow reserving large page space
2855 // so we just use 4K pages for reserve, this gives us a legal contiguous
2856 // address space. then we will deallocate that reservation, and re alloc
2857 // using large pages
2858 const size_t size_of_reserve = bytes + chunk_size;
2859 if (bytes > size_of_reserve) {
2860 // Overflowed.
2861 return NULL;
2862 }
2863 p_buf = (char *) VirtualAlloc(addr,
2864 size_of_reserve, // size of Reserve
2865 MEM_RESERVE,
2866 PAGE_READWRITE);
2867 // If reservation failed, return NULL
2868 if (p_buf == NULL) return NULL;
2869 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2870 os::release_memory(p_buf, bytes + chunk_size);
2871
2872 // we still need to round up to a page boundary (in case we are using large pages)
2873 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2874 // instead we handle this in the bytes_to_rq computation below
2875 p_buf = align_up(p_buf, page_size);
2876
2877 // now go through and allocate one chunk at a time until all bytes are
2878 // allocated
2879 size_t bytes_remaining = bytes;
2880 // An overflow of align_up() would have been caught above
2881 // in the calculation of size_of_reserve.
2882 char * next_alloc_addr = p_buf;
2883 HANDLE hProc = GetCurrentProcess();
2884
2885 #ifdef ASSERT
2886 // Variable for the failure injection
2887 int ran_num = os::random();
2888 size_t fail_after = ran_num % bytes;
2889 #endif
2890
2891 int count=0;
2892 while (bytes_remaining) {
2893 // select bytes_to_rq to get to the next chunk_size boundary
2894
2895 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2896 // Note allocate and commit
2897 char * p_new;
2898
2899 #ifdef ASSERT
2900 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2901 #else
2902 const bool inject_error_now = false;
2903 #endif
2904
2905 if (inject_error_now) {
2906 p_new = NULL;
2907 } else {
2908 if (!UseNUMAInterleaving) {
2909 p_new = (char *) VirtualAlloc(next_alloc_addr,
2910 bytes_to_rq,
2911 flags,
2912 prot);
2913 } else {
2914 // get the next node to use from the used_node_list
2915 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2916 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2917 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2918 }
2919 }
2920
2921 if (p_new == NULL) {
2922 // Free any allocated pages
2923 if (next_alloc_addr > p_buf) {
2924 // Some memory was committed so release it.
2925 size_t bytes_to_release = bytes - bytes_remaining;
2926 // NMT has yet to record any individual blocks, so it
2927 // need to create a dummy 'reserve' record to match
2928 // the release.
2929 MemTracker::record_virtual_memory_reserve((address)p_buf,
2930 bytes_to_release, CALLER_PC);
2931 os::release_memory(p_buf, bytes_to_release);
2932 }
2933 #ifdef ASSERT
2934 if (should_inject_error) {
2935 log_develop_debug(pagesize)("Reserving pages individually failed.");
2936 }
2937 #endif
2938 return NULL;
2939 }
2940
2941 bytes_remaining -= bytes_to_rq;
2942 next_alloc_addr += bytes_to_rq;
2943 count++;
2944 }
2945 // Although the memory is allocated individually, it is returned as one.
2946 // NMT records it as one block.
2947 if ((flags & MEM_COMMIT) != 0) {
2948 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2949 } else {
2950 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2951 }
2952
2953 // made it this far, success
2954 return p_buf;
2955 }
2956
2957
2958
2959 void os::large_page_init() {
2960 if (!UseLargePages) return;
2961
2962 // print a warning if any large page related flag is specified on command line
2963 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2964 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2965 bool success = false;
2966
2967 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2968 if (request_lock_memory_privilege()) {
2969 size_t s = GetLargePageMinimum();
2970 if (s) {
2971 #if defined(IA32) || defined(AMD64)
2972 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2973 WARN("JVM cannot use large pages bigger than 4mb.");
2974 } else {
2975 #endif
2976 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2977 _large_page_size = LargePageSizeInBytes;
2978 } else {
2979 _large_page_size = s;
2980 }
2981 success = true;
2982 #if defined(IA32) || defined(AMD64)
2983 }
2984 #endif
2985 } else {
2986 WARN("Large page is not supported by the processor.");
2987 }
2988 } else {
2989 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2990 }
2991 #undef WARN
2992
2993 const size_t default_page_size = (size_t) vm_page_size();
2994 if (success && _large_page_size > default_page_size) {
2995 _page_sizes[0] = _large_page_size;
2996 _page_sizes[1] = default_page_size;
2997 _page_sizes[2] = 0;
2998 }
2999
3000 cleanup_after_large_page_init();
3001 UseLargePages = success;
3002 }
3003
3004 int os::create_file_for_heap(const char* dir) {
3005
3006 const char name_template[] = "/jvmheap.XXXXXX";
3007
3008 size_t fullname_len = strlen(dir) + strlen(name_template);
3009 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3010 if (fullname == NULL) {
3011 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3012 return -1;
3013 }
3014 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3015 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3016
3017 os::native_path(fullname);
3018
3019 char *path = _mktemp(fullname);
3020 if (path == NULL) {
3021 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3022 os::free(fullname);
3023 return -1;
3024 }
3025
3026 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3027
3028 os::free(fullname);
3029 if (fd < 0) {
3030 warning("Problem opening file for heap (%s)", os::strerror(errno));
3031 return -1;
3032 }
3033 return fd;
3034 }
3035
3036 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3037 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3038 assert(fd != -1, "File descriptor is not valid");
3039
3040 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3041 #ifdef _LP64
3042 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3043 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3044 #else
3045 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3046 0, (DWORD)size, NULL);
3047 #endif
3048 if (fileMapping == NULL) {
3049 if (GetLastError() == ERROR_DISK_FULL) {
3050 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3051 }
3052 else {
3053 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3054 }
3055
3056 return NULL;
3057 }
3058
3059 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3060
3061 CloseHandle(fileMapping);
3062
3063 return (char*)addr;
3064 }
3065
3066 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3067 assert(fd != -1, "File descriptor is not valid");
3068 assert(base != NULL, "Base address cannot be NULL");
3069
3070 release_memory(base, size);
3071 return map_memory_to_file(base, size, fd);
3072 }
3073
3074 // On win32, one cannot release just a part of reserved memory, it's an
3075 // all or nothing deal. When we split a reservation, we must break the
3076 // reservation into two reservations.
3077 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3078 bool realloc) {
3079 if (size > 0) {
3080 release_memory(base, size);
3081 if (realloc) {
3082 reserve_memory(split, base);
3083 }
3084 if (size != split) {
3085 reserve_memory(size - split, base + split);
3086 }
3087 }
3088 }
3089
3090 // Multiple threads can race in this code but it's not possible to unmap small sections of
3091 // virtual space to get requested alignment, like posix-like os's.
3092 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3093 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3094 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3095 "Alignment must be a multiple of allocation granularity (page size)");
3096 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3097
3098 size_t extra_size = size + alignment;
3099 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3100
3101 char* aligned_base = NULL;
3102
3103 do {
3104 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3105 if (extra_base == NULL) {
3106 return NULL;
3107 }
3108 // Do manual alignment
3109 aligned_base = align_up(extra_base, alignment);
3110
3111 if (file_desc != -1) {
3112 os::unmap_memory(extra_base, extra_size);
3113 } else {
3114 os::release_memory(extra_base, extra_size);
3115 }
3116
3117 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3118
3119 } while (aligned_base == NULL);
3120
3121 return aligned_base;
3122 }
3123
3124 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3125 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3126 "reserve alignment");
3127 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3128 char* res;
3129 // note that if UseLargePages is on, all the areas that require interleaving
3130 // will go thru reserve_memory_special rather than thru here.
3131 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3132 if (!use_individual) {
3133 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3134 } else {
3135 elapsedTimer reserveTimer;
3136 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3137 // in numa interleaving, we have to allocate pages individually
3138 // (well really chunks of NUMAInterleaveGranularity size)
3139 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3140 if (res == NULL) {
3141 warning("NUMA page allocation failed");
3142 }
3143 if (Verbose && PrintMiscellaneous) {
3144 reserveTimer.stop();
3145 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3146 reserveTimer.milliseconds(), reserveTimer.ticks());
3147 }
3148 }
3149 assert(res == NULL || addr == NULL || addr == res,
3150 "Unexpected address from reserve.");
3151
3152 return res;
3153 }
3154
3155 // Reserve memory at an arbitrary address, only if that area is
3156 // available (and not reserved for something else).
3157 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3158 // Windows os::reserve_memory() fails of the requested address range is
3159 // not avilable.
3160 return reserve_memory(bytes, requested_addr);
3161 }
3162
3163 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3164 assert(file_desc >= 0, "file_desc is not valid");
3165 return map_memory_to_file(requested_addr, bytes, file_desc);
3166 }
3167
3168 size_t os::large_page_size() {
3169 return _large_page_size;
3170 }
3171
3172 bool os::can_commit_large_page_memory() {
3173 // Windows only uses large page memory when the entire region is reserved
3174 // and committed in a single VirtualAlloc() call. This may change in the
3175 // future, but with Windows 2003 it's not possible to commit on demand.
3176 return false;
3177 }
3178
3179 bool os::can_execute_large_page_memory() {
3180 return true;
3181 }
3182
3183 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3184 bool exec) {
3185 assert(UseLargePages, "only for large pages");
3186
3187 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3188 return NULL; // Fallback to small pages.
3189 }
3190
3191 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3192 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3193
3194 // with large pages, there are two cases where we need to use Individual Allocation
3195 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3196 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3197 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3198 log_debug(pagesize)("Reserving large pages individually.");
3199
3200 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3201 if (p_buf == NULL) {
3202 // give an appropriate warning message
3203 if (UseNUMAInterleaving) {
3204 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3205 }
3206 if (UseLargePagesIndividualAllocation) {
3207 warning("Individually allocated large pages failed, "
3208 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3209 }
3210 return NULL;
3211 }
3212
3213 return p_buf;
3214
3215 } else {
3216 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3217
3218 // normal policy just allocate it all at once
3219 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3220 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3221 if (res != NULL) {
3222 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3223 }
3224
3225 return res;
3226 }
3227 }
3228
3229 bool os::release_memory_special(char* base, size_t bytes) {
3230 assert(base != NULL, "Sanity check");
3231 return release_memory(base, bytes);
3232 }
3233
3234 void os::print_statistics() {
3235 }
3236
3237 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3238 int err = os::get_last_error();
3239 char buf[256];
3240 size_t buf_len = os::lasterror(buf, sizeof(buf));
3241 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3242 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3243 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3244 }
3245
3246 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3247 if (bytes == 0) {
3248 // Don't bother the OS with noops.
3249 return true;
3250 }
3251 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3252 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3253 // Don't attempt to print anything if the OS call fails. We're
3254 // probably low on resources, so the print itself may cause crashes.
3255
3256 // unless we have NUMAInterleaving enabled, the range of a commit
3257 // is always within a reserve covered by a single VirtualAlloc
3258 // in that case we can just do a single commit for the requested size
3259 if (!UseNUMAInterleaving) {
3260 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3261 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3262 return false;
3263 }
3264 if (exec) {
3265 DWORD oldprot;
3266 // Windows doc says to use VirtualProtect to get execute permissions
3267 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3268 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3269 return false;
3270 }
3271 }
3272 return true;
3273 } else {
3274
3275 // when NUMAInterleaving is enabled, the commit might cover a range that
3276 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3277 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3278 // returns represents the number of bytes that can be committed in one step.
3279 size_t bytes_remaining = bytes;
3280 char * next_alloc_addr = addr;
3281 while (bytes_remaining > 0) {
3282 MEMORY_BASIC_INFORMATION alloc_info;
3283 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3284 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3285 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3286 PAGE_READWRITE) == NULL) {
3287 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3288 exec);)
3289 return false;
3290 }
3291 if (exec) {
3292 DWORD oldprot;
3293 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3294 PAGE_EXECUTE_READWRITE, &oldprot)) {
3295 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3296 exec);)
3297 return false;
3298 }
3299 }
3300 bytes_remaining -= bytes_to_rq;
3301 next_alloc_addr += bytes_to_rq;
3302 }
3303 }
3304 // if we made it this far, return true
3305 return true;
3306 }
3307
3308 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3309 bool exec) {
3310 // alignment_hint is ignored on this OS
3311 return pd_commit_memory(addr, size, exec);
3312 }
3313
3314 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3315 const char* mesg) {
3316 assert(mesg != NULL, "mesg must be specified");
3317 if (!pd_commit_memory(addr, size, exec)) {
3318 warn_fail_commit_memory(addr, size, exec);
3319 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3320 }
3321 }
3322
3323 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3324 size_t alignment_hint, bool exec,
3325 const char* mesg) {
3326 // alignment_hint is ignored on this OS
3327 pd_commit_memory_or_exit(addr, size, exec, mesg);
3328 }
3329
3330 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3331 if (bytes == 0) {
3332 // Don't bother the OS with noops.
3333 return true;
3334 }
3335 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3336 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3337 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3338 }
3339
3340 bool os::pd_release_memory(char* addr, size_t bytes) {
3341 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3342 }
3343
3344 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3345 return os::commit_memory(addr, size, !ExecMem);
3346 }
3347
3348 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3349 return os::uncommit_memory(addr, size);
3350 }
3351
3352 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3353 uint count = 0;
3354 bool ret = false;
3355 size_t bytes_remaining = bytes;
3356 char * next_protect_addr = addr;
3357
3358 // Use VirtualQuery() to get the chunk size.
3359 while (bytes_remaining) {
3360 MEMORY_BASIC_INFORMATION alloc_info;
3361 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3362 return false;
3363 }
3364
3365 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3366 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3367 // but we don't distinguish here as both cases are protected by same API.
3368 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3369 warning("Failed protecting pages individually for chunk #%u", count);
3370 if (!ret) {
3371 return false;
3372 }
3373
3374 bytes_remaining -= bytes_to_protect;
3375 next_protect_addr += bytes_to_protect;
3376 count++;
3377 }
3378 return ret;
3379 }
3380
3381 // Set protections specified
3382 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3383 bool is_committed) {
3384 unsigned int p = 0;
3385 switch (prot) {
3386 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3387 case MEM_PROT_READ: p = PAGE_READONLY; break;
3388 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3389 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3390 default:
3391 ShouldNotReachHere();
3392 }
3393
3394 DWORD old_status;
3395
3396 // Strange enough, but on Win32 one can change protection only for committed
3397 // memory, not a big deal anyway, as bytes less or equal than 64K
3398 if (!is_committed) {
3399 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3400 "cannot commit protection page");
3401 }
3402 // One cannot use os::guard_memory() here, as on Win32 guard page
3403 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3404 //
3405 // Pages in the region become guard pages. Any attempt to access a guard page
3406 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3407 // the guard page status. Guard pages thus act as a one-time access alarm.
3408 bool ret;
3409 if (UseNUMAInterleaving) {
3410 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3411 // so we must protect the chunks individually.
3412 ret = protect_pages_individually(addr, bytes, p, &old_status);
3413 } else {
3414 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3415 }
3416 #ifdef ASSERT
3417 if (!ret) {
3418 int err = os::get_last_error();
3419 char buf[256];
3420 size_t buf_len = os::lasterror(buf, sizeof(buf));
3421 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3422 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3423 buf_len != 0 ? buf : "<no_error_string>", err);
3424 }
3425 #endif
3426 return ret;
3427 }
3428
3429 bool os::guard_memory(char* addr, size_t bytes) {
3430 DWORD old_status;
3431 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3432 }
3433
3434 bool os::unguard_memory(char* addr, size_t bytes) {
3435 DWORD old_status;
3436 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3437 }
3438
3439 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3440 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3441 void os::numa_make_global(char *addr, size_t bytes) { }
3442 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3443 bool os::numa_topology_changed() { return false; }
3444 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3445 int os::numa_get_group_id() { return 0; }
3446 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3447 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3448 // Provide an answer for UMA systems
3449 ids[0] = 0;
3450 return 1;
3451 } else {
3452 // check for size bigger than actual groups_num
3453 size = MIN2(size, numa_get_groups_num());
3454 for (int i = 0; i < (int)size; i++) {
3455 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3456 }
3457 return size;
3458 }
3459 }
3460
3461 bool os::get_page_info(char *start, page_info* info) {
3462 return false;
3463 }
3464
3465 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3466 page_info* page_found) {
3467 return end;
3468 }
3469
3470 char* os::non_memory_address_word() {
3471 // Must never look like an address returned by reserve_memory,
3472 // even in its subfields (as defined by the CPU immediate fields,
3473 // if the CPU splits constants across multiple instructions).
3474 return (char*)-1;
3475 }
3476
3477 #define MAX_ERROR_COUNT 100
3478 #define SYS_THREAD_ERROR 0xffffffffUL
3479
3480 void os::pd_start_thread(Thread* thread) {
3481 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3482 // Returns previous suspend state:
3483 // 0: Thread was not suspended
3484 // 1: Thread is running now
3485 // >1: Thread is still suspended.
3486 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3487 }
3488
3489
3490
3491 // Short sleep, direct OS call.
3492 //
3493 // ms = 0, means allow others (if any) to run.
3494 //
3495 void os::naked_short_sleep(jlong ms) {
3496 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3497 Sleep(ms);
3498 }
3499
3500 // Windows does not provide sleep functionality with nanosecond resolution, so we
3501 // try to approximate this with spinning combined with yielding if another thread
3502 // is ready to run on the current processor.
3503 void os::naked_short_nanosleep(jlong ns) {
3504 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3505
3506 int64_t start = os::javaTimeNanos();
3507 do {
3508 if (SwitchToThread() == 0) {
3509 // Nothing else is ready to run on this cpu, spin a little
3510 SpinPause();
3511 }
3512 } while (os::javaTimeNanos() - start < ns);
3513 }
3514
3515 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3516 void os::infinite_sleep() {
3517 while (true) { // sleep forever ...
3518 Sleep(100000); // ... 100 seconds at a time
3519 }
3520 }
3521
3522 typedef BOOL (WINAPI * STTSignature)(void);
3523
3524 void os::naked_yield() {
3525 // Consider passing back the return value from SwitchToThread().
3526 SwitchToThread();
3527 }
3528
3529 // Win32 only gives you access to seven real priorities at a time,
3530 // so we compress Java's ten down to seven. It would be better
3531 // if we dynamically adjusted relative priorities.
3532
3533 int os::java_to_os_priority[CriticalPriority + 1] = {
3534 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3535 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3536 THREAD_PRIORITY_LOWEST, // 2
3537 THREAD_PRIORITY_BELOW_NORMAL, // 3
3538 THREAD_PRIORITY_BELOW_NORMAL, // 4
3539 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3540 THREAD_PRIORITY_NORMAL, // 6
3541 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3542 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3543 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3544 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3545 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3546 };
3547
3548 int prio_policy1[CriticalPriority + 1] = {
3549 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3550 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3551 THREAD_PRIORITY_LOWEST, // 2
3552 THREAD_PRIORITY_BELOW_NORMAL, // 3
3553 THREAD_PRIORITY_BELOW_NORMAL, // 4
3554 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3555 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3556 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3557 THREAD_PRIORITY_HIGHEST, // 8
3558 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3559 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3560 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3561 };
3562
3563 static int prio_init() {
3564 // If ThreadPriorityPolicy is 1, switch tables
3565 if (ThreadPriorityPolicy == 1) {
3566 int i;
3567 for (i = 0; i < CriticalPriority + 1; i++) {
3568 os::java_to_os_priority[i] = prio_policy1[i];
3569 }
3570 }
3571 if (UseCriticalJavaThreadPriority) {
3572 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3573 }
3574 return 0;
3575 }
3576
3577 OSReturn os::set_native_priority(Thread* thread, int priority) {
3578 if (!UseThreadPriorities) return OS_OK;
3579 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3580 return ret ? OS_OK : OS_ERR;
3581 }
3582
3583 OSReturn os::get_native_priority(const Thread* const thread,
3584 int* priority_ptr) {
3585 if (!UseThreadPriorities) {
3586 *priority_ptr = java_to_os_priority[NormPriority];
3587 return OS_OK;
3588 }
3589 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3590 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3591 assert(false, "GetThreadPriority failed");
3592 return OS_ERR;
3593 }
3594 *priority_ptr = os_prio;
3595 return OS_OK;
3596 }
3597
3598 void os::interrupt(Thread* thread) {
3599 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3600
3601 OSThread* osthread = thread->osthread();
3602 osthread->set_interrupted(true);
3603 // More than one thread can get here with the same value of osthread,
3604 // resulting in multiple notifications. We do, however, want the store
3605 // to interrupted() to be visible to other threads before we post
3606 // the interrupt event.
3607 OrderAccess::release();
3608 SetEvent(osthread->interrupt_event());
3609 // For JSR166: unpark after setting status
3610 if (thread->is_Java_thread()) {
3611 ((JavaThread*)thread)->parker()->unpark();
3612 }
3613
3614 ParkEvent * ev = thread->_ParkEvent;
3615 if (ev != NULL) ev->unpark();
3616
3617 ev = thread->_SleepEvent;
3618 if (ev != NULL) ev->unpark();
3619 }
3620
3621
3622 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3623 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3624
3625 OSThread* osthread = thread->osthread();
3626 // There is no synchronization between the setting of the interrupt
3627 // and it being cleared here. It is critical - see 6535709 - that
3628 // we only clear the interrupt state, and reset the interrupt event,
3629 // if we are going to report that we were indeed interrupted - else
3630 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3631 // depending on the timing. By checking thread interrupt event to see
3632 // if the thread gets real interrupt thus prevent spurious wakeup.
3633 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3634 if (interrupted && clear_interrupted) {
3635 osthread->set_interrupted(false);
3636 ResetEvent(osthread->interrupt_event());
3637 } // Otherwise leave the interrupted state alone
3638
3639 return interrupted;
3640 }
3641
3642 // GetCurrentThreadId() returns DWORD
3643 intx os::current_thread_id() { return GetCurrentThreadId(); }
3644
3645 static int _initial_pid = 0;
3646
3647 int os::current_process_id() {
3648 return (_initial_pid ? _initial_pid : _getpid());
3649 }
3650
3651 int os::win32::_vm_page_size = 0;
3652 int os::win32::_vm_allocation_granularity = 0;
3653 int os::win32::_processor_type = 0;
3654 // Processor level is not available on non-NT systems, use vm_version instead
3655 int os::win32::_processor_level = 0;
3656 julong os::win32::_physical_memory = 0;
3657 size_t os::win32::_default_stack_size = 0;
3658
3659 intx os::win32::_os_thread_limit = 0;
3660 volatile intx os::win32::_os_thread_count = 0;
3661
3662 bool os::win32::_is_windows_server = false;
3663
3664 // 6573254
3665 // Currently, the bug is observed across all the supported Windows releases,
3666 // including the latest one (as of this writing - Windows Server 2012 R2)
3667 bool os::win32::_has_exit_bug = true;
3668
3669 void os::win32::initialize_system_info() {
3670 SYSTEM_INFO si;
3671 GetSystemInfo(&si);
3672 _vm_page_size = si.dwPageSize;
3673 _vm_allocation_granularity = si.dwAllocationGranularity;
3674 _processor_type = si.dwProcessorType;
3675 _processor_level = si.wProcessorLevel;
3676 set_processor_count(si.dwNumberOfProcessors);
3677
3678 MEMORYSTATUSEX ms;
3679 ms.dwLength = sizeof(ms);
3680
3681 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3682 // dwMemoryLoad (% of memory in use)
3683 GlobalMemoryStatusEx(&ms);
3684 _physical_memory = ms.ullTotalPhys;
3685
3686 if (FLAG_IS_DEFAULT(MaxRAM)) {
3687 // Adjust MaxRAM according to the maximum virtual address space available.
3688 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3689 }
3690
3691 OSVERSIONINFOEX oi;
3692 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3693 GetVersionEx((OSVERSIONINFO*)&oi);
3694 switch (oi.dwPlatformId) {
3695 case VER_PLATFORM_WIN32_NT:
3696 {
3697 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3698 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3699 oi.wProductType == VER_NT_SERVER) {
3700 _is_windows_server = true;
3701 }
3702 }
3703 break;
3704 default: fatal("Unknown platform");
3705 }
3706
3707 _default_stack_size = os::current_stack_size();
3708 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3709 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3710 "stack size not a multiple of page size");
3711
3712 initialize_performance_counter();
3713 }
3714
3715
3716 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3717 int ebuflen) {
3718 char path[MAX_PATH];
3719 DWORD size;
3720 DWORD pathLen = (DWORD)sizeof(path);
3721 HINSTANCE result = NULL;
3722
3723 // only allow library name without path component
3724 assert(strchr(name, '\\') == NULL, "path not allowed");
3725 assert(strchr(name, ':') == NULL, "path not allowed");
3726 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3727 jio_snprintf(ebuf, ebuflen,
3728 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3729 return NULL;
3730 }
3731
3732 // search system directory
3733 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3734 if (size >= pathLen) {
3735 return NULL; // truncated
3736 }
3737 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3738 return NULL; // truncated
3739 }
3740 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3741 return result;
3742 }
3743 }
3744
3745 // try Windows directory
3746 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3747 if (size >= pathLen) {
3748 return NULL; // truncated
3749 }
3750 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3751 return NULL; // truncated
3752 }
3753 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3754 return result;
3755 }
3756 }
3757
3758 jio_snprintf(ebuf, ebuflen,
3759 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3760 return NULL;
3761 }
3762
3763 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3764 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3765
3766 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3767 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3768 return TRUE;
3769 }
3770
3771 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3772 // Basic approach:
3773 // - Each exiting thread registers its intent to exit and then does so.
3774 // - A thread trying to terminate the process must wait for all
3775 // threads currently exiting to complete their exit.
3776
3777 if (os::win32::has_exit_bug()) {
3778 // The array holds handles of the threads that have started exiting by calling
3779 // _endthreadex().
3780 // Should be large enough to avoid blocking the exiting thread due to lack of
3781 // a free slot.
3782 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3783 static int handle_count = 0;
3784
3785 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3786 static CRITICAL_SECTION crit_sect;
3787 static volatile DWORD process_exiting = 0;
3788 int i, j;
3789 DWORD res;
3790 HANDLE hproc, hthr;
3791
3792 // We only attempt to register threads until a process exiting
3793 // thread manages to set the process_exiting flag. Any threads
3794 // that come through here after the process_exiting flag is set
3795 // are unregistered and will be caught in the SuspendThread()
3796 // infinite loop below.
3797 bool registered = false;
3798
3799 // The first thread that reached this point, initializes the critical section.
3800 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3801 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3802 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3803 if (what != EPT_THREAD) {
3804 // Atomically set process_exiting before the critical section
3805 // to increase the visibility between racing threads.
3806 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3807 }
3808 EnterCriticalSection(&crit_sect);
3809
3810 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3811 // Remove from the array those handles of the threads that have completed exiting.
3812 for (i = 0, j = 0; i < handle_count; ++i) {
3813 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3814 if (res == WAIT_TIMEOUT) {
3815 handles[j++] = handles[i];
3816 } else {
3817 if (res == WAIT_FAILED) {
3818 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3819 GetLastError(), __FILE__, __LINE__);
3820 }
3821 // Don't keep the handle, if we failed waiting for it.
3822 CloseHandle(handles[i]);
3823 }
3824 }
3825
3826 // If there's no free slot in the array of the kept handles, we'll have to
3827 // wait until at least one thread completes exiting.
3828 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3829 // Raise the priority of the oldest exiting thread to increase its chances
3830 // to complete sooner.
3831 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3832 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3833 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3834 i = (res - WAIT_OBJECT_0);
3835 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3836 for (; i < handle_count; ++i) {
3837 handles[i] = handles[i + 1];
3838 }
3839 } else {
3840 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3841 (res == WAIT_FAILED ? "failed" : "timed out"),
3842 GetLastError(), __FILE__, __LINE__);
3843 // Don't keep handles, if we failed waiting for them.
3844 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3845 CloseHandle(handles[i]);
3846 }
3847 handle_count = 0;
3848 }
3849 }
3850
3851 // Store a duplicate of the current thread handle in the array of handles.
3852 hproc = GetCurrentProcess();
3853 hthr = GetCurrentThread();
3854 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3855 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3856 warning("DuplicateHandle failed (%u) in %s: %d\n",
3857 GetLastError(), __FILE__, __LINE__);
3858
3859 // We can't register this thread (no more handles) so this thread
3860 // may be racing with a thread that is calling exit(). If the thread
3861 // that is calling exit() has managed to set the process_exiting
3862 // flag, then this thread will be caught in the SuspendThread()
3863 // infinite loop below which closes that race. A small timing
3864 // window remains before the process_exiting flag is set, but it
3865 // is only exposed when we are out of handles.
3866 } else {
3867 ++handle_count;
3868 registered = true;
3869
3870 // The current exiting thread has stored its handle in the array, and now
3871 // should leave the critical section before calling _endthreadex().
3872 }
3873
3874 } else if (what != EPT_THREAD && handle_count > 0) {
3875 jlong start_time, finish_time, timeout_left;
3876 // Before ending the process, make sure all the threads that had called
3877 // _endthreadex() completed.
3878
3879 // Set the priority level of the current thread to the same value as
3880 // the priority level of exiting threads.
3881 // This is to ensure it will be given a fair chance to execute if
3882 // the timeout expires.
3883 hthr = GetCurrentThread();
3884 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3885 start_time = os::javaTimeNanos();
3886 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3887 for (i = 0; ; ) {
3888 int portion_count = handle_count - i;
3889 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3890 portion_count = MAXIMUM_WAIT_OBJECTS;
3891 }
3892 for (j = 0; j < portion_count; ++j) {
3893 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3894 }
3895 timeout_left = (finish_time - start_time) / 1000000L;
3896 if (timeout_left < 0) {
3897 timeout_left = 0;
3898 }
3899 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3900 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3901 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3902 (res == WAIT_FAILED ? "failed" : "timed out"),
3903 GetLastError(), __FILE__, __LINE__);
3904 // Reset portion_count so we close the remaining
3905 // handles due to this error.
3906 portion_count = handle_count - i;
3907 }
3908 for (j = 0; j < portion_count; ++j) {
3909 CloseHandle(handles[i + j]);
3910 }
3911 if ((i += portion_count) >= handle_count) {
3912 break;
3913 }
3914 start_time = os::javaTimeNanos();
3915 }
3916 handle_count = 0;
3917 }
3918
3919 LeaveCriticalSection(&crit_sect);
3920 }
3921
3922 if (!registered &&
3923 OrderAccess::load_acquire(&process_exiting) != 0 &&
3924 process_exiting != GetCurrentThreadId()) {
3925 // Some other thread is about to call exit(), so we don't let
3926 // the current unregistered thread proceed to exit() or _endthreadex()
3927 while (true) {
3928 SuspendThread(GetCurrentThread());
3929 // Avoid busy-wait loop, if SuspendThread() failed.
3930 Sleep(EXIT_TIMEOUT);
3931 }
3932 }
3933 }
3934
3935 // We are here if either
3936 // - there's no 'race at exit' bug on this OS release;
3937 // - initialization of the critical section failed (unlikely);
3938 // - the current thread has registered itself and left the critical section;
3939 // - the process-exiting thread has raised the flag and left the critical section.
3940 if (what == EPT_THREAD) {
3941 _endthreadex((unsigned)exit_code);
3942 } else if (what == EPT_PROCESS) {
3943 ::exit(exit_code);
3944 } else {
3945 _exit(exit_code);
3946 }
3947
3948 // Should not reach here
3949 return exit_code;
3950 }
3951
3952 #undef EXIT_TIMEOUT
3953
3954 void os::win32::setmode_streams() {
3955 _setmode(_fileno(stdin), _O_BINARY);
3956 _setmode(_fileno(stdout), _O_BINARY);
3957 _setmode(_fileno(stderr), _O_BINARY);
3958 }
3959
3960
3961 bool os::is_debugger_attached() {
3962 return IsDebuggerPresent() ? true : false;
3963 }
3964
3965
3966 void os::wait_for_keypress_at_exit(void) {
3967 if (PauseAtExit) {
3968 fprintf(stderr, "Press any key to continue...\n");
3969 fgetc(stdin);
3970 }
3971 }
3972
3973
3974 bool os::message_box(const char* title, const char* message) {
3975 int result = MessageBox(NULL, message, title,
3976 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3977 return result == IDYES;
3978 }
3979
3980 #ifndef PRODUCT
3981 #ifndef _WIN64
3982 // Helpers to check whether NX protection is enabled
3983 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3984 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3985 pex->ExceptionRecord->NumberParameters > 0 &&
3986 pex->ExceptionRecord->ExceptionInformation[0] ==
3987 EXCEPTION_INFO_EXEC_VIOLATION) {
3988 return EXCEPTION_EXECUTE_HANDLER;
3989 }
3990 return EXCEPTION_CONTINUE_SEARCH;
3991 }
3992
3993 void nx_check_protection() {
3994 // If NX is enabled we'll get an exception calling into code on the stack
3995 char code[] = { (char)0xC3 }; // ret
3996 void *code_ptr = (void *)code;
3997 __try {
3998 __asm call code_ptr
3999 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4000 tty->print_raw_cr("NX protection detected.");
4001 }
4002 }
4003 #endif // _WIN64
4004 #endif // PRODUCT
4005
4006 // This is called _before_ the global arguments have been parsed
4007 void os::init(void) {
4008 _initial_pid = _getpid();
4009
4010 init_random(1234567);
4011
4012 win32::initialize_system_info();
4013 win32::setmode_streams();
4014 init_page_sizes((size_t) win32::vm_page_size());
4015
4016 // This may be overridden later when argument processing is done.
4017 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
4018
4019 // Initialize main_process and main_thread
4020 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4021 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4022 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4023 fatal("DuplicateHandle failed\n");
4024 }
4025 main_thread_id = (int) GetCurrentThreadId();
4026
4027 // initialize fast thread access - only used for 32-bit
4028 win32::initialize_thread_ptr_offset();
4029 }
4030
4031 // To install functions for atexit processing
4032 extern "C" {
4033 static void perfMemory_exit_helper() {
4034 perfMemory_exit();
4035 }
4036 }
4037
4038 static jint initSock();
4039
4040 // this is called _after_ the global arguments have been parsed
4041 jint os::init_2(void) {
4042
4043 // This could be set any time but all platforms
4044 // have to set it the same so we have to mirror Solaris.
4045 DEBUG_ONLY(os::set_mutex_init_done();)
4046
4047 // Setup Windows Exceptions
4048
4049 #if INCLUDE_AOT
4050 // If AOT is enabled we need to install a vectored exception handler
4051 // in order to forward implicit exceptions from code in AOT
4052 // generated DLLs. This is necessary since these DLLs are not
4053 // registered for structured exceptions like codecache methods are.
4054 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4055 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4056 }
4057 #endif
4058
4059 // for debugging float code generation bugs
4060 if (ForceFloatExceptions) {
4061 #ifndef _WIN64
4062 static long fp_control_word = 0;
4063 __asm { fstcw fp_control_word }
4064 // see Intel PPro Manual, Vol. 2, p 7-16
4065 const long precision = 0x20;
4066 const long underflow = 0x10;
4067 const long overflow = 0x08;
4068 const long zero_div = 0x04;
4069 const long denorm = 0x02;
4070 const long invalid = 0x01;
4071 fp_control_word |= invalid;
4072 __asm { fldcw fp_control_word }
4073 #endif
4074 }
4075
4076 // If stack_commit_size is 0, windows will reserve the default size,
4077 // but only commit a small portion of it.
4078 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4079 size_t default_reserve_size = os::win32::default_stack_size();
4080 size_t actual_reserve_size = stack_commit_size;
4081 if (stack_commit_size < default_reserve_size) {
4082 // If stack_commit_size == 0, we want this too
4083 actual_reserve_size = default_reserve_size;
4084 }
4085
4086 // Check minimum allowable stack size for thread creation and to initialize
4087 // the java system classes, including StackOverflowError - depends on page
4088 // size. Add two 4K pages for compiler2 recursion in main thread.
4089 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4090 // class initialization depending on 32 or 64 bit VM.
4091 size_t min_stack_allowed =
4092 (size_t)(JavaThread::stack_guard_zone_size() +
4093 JavaThread::stack_shadow_zone_size() +
4094 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4095
4096 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4097
4098 if (actual_reserve_size < min_stack_allowed) {
4099 tty->print_cr("\nThe Java thread stack size specified is too small. "
4100 "Specify at least %dk",
4101 min_stack_allowed / K);
4102 return JNI_ERR;
4103 }
4104
4105 JavaThread::set_stack_size_at_create(stack_commit_size);
4106
4107 // Calculate theoretical max. size of Threads to guard gainst artifical
4108 // out-of-memory situations, where all available address-space has been
4109 // reserved by thread stacks.
4110 assert(actual_reserve_size != 0, "Must have a stack");
4111
4112 // Calculate the thread limit when we should start doing Virtual Memory
4113 // banging. Currently when the threads will have used all but 200Mb of space.
4114 //
4115 // TODO: consider performing a similar calculation for commit size instead
4116 // as reserve size, since on a 64-bit platform we'll run into that more
4117 // often than running out of virtual memory space. We can use the
4118 // lower value of the two calculations as the os_thread_limit.
4119 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4120 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4121
4122 // at exit methods are called in the reverse order of their registration.
4123 // there is no limit to the number of functions registered. atexit does
4124 // not set errno.
4125
4126 if (PerfAllowAtExitRegistration) {
4127 // only register atexit functions if PerfAllowAtExitRegistration is set.
4128 // atexit functions can be delayed until process exit time, which
4129 // can be problematic for embedded VM situations. Embedded VMs should
4130 // call DestroyJavaVM() to assure that VM resources are released.
4131
4132 // note: perfMemory_exit_helper atexit function may be removed in
4133 // the future if the appropriate cleanup code can be added to the
4134 // VM_Exit VMOperation's doit method.
4135 if (atexit(perfMemory_exit_helper) != 0) {
4136 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4137 }
4138 }
4139
4140 #ifndef _WIN64
4141 // Print something if NX is enabled (win32 on AMD64)
4142 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4143 #endif
4144
4145 // initialize thread priority policy
4146 prio_init();
4147
4148 if (UseNUMA && !ForceNUMA) {
4149 UseNUMA = false; // We don't fully support this yet
4150 }
4151
4152 if (UseNUMAInterleaving) {
4153 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4154 bool success = numa_interleaving_init();
4155 if (!success) UseNUMAInterleaving = false;
4156 }
4157
4158 if (initSock() != JNI_OK) {
4159 return JNI_ERR;
4160 }
4161
4162 SymbolEngine::recalc_search_path();
4163
4164 // Initialize data for jdk.internal.misc.Signal
4165 if (!ReduceSignalUsage) {
4166 jdk_misc_signal_init();
4167 }
4168
4169 return JNI_OK;
4170 }
4171
4172 // Mark the polling page as unreadable
4173 void os::make_polling_page_unreadable(void) {
4174 DWORD old_status;
4175 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4176 PAGE_NOACCESS, &old_status)) {
4177 fatal("Could not disable polling page");
4178 }
4179 }
4180
4181 // Mark the polling page as readable
4182 void os::make_polling_page_readable(void) {
4183 DWORD old_status;
4184 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4185 PAGE_READONLY, &old_status)) {
4186 fatal("Could not enable polling page");
4187 }
4188 }
4189
4190 // combine the high and low DWORD into a ULONGLONG
4191 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4192 ULONGLONG value = high_word;
4193 value <<= sizeof(high_word) * 8;
4194 value |= low_word;
4195 return value;
4196 }
4197
4198 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4199 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4200 ::memset((void*)sbuf, 0, sizeof(struct stat));
4201 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4202 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4203 file_data.ftLastWriteTime.dwLowDateTime);
4204 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4205 file_data.ftCreationTime.dwLowDateTime);
4206 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4207 file_data.ftLastAccessTime.dwLowDateTime);
4208 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4209 sbuf->st_mode |= S_IFDIR;
4210 } else {
4211 sbuf->st_mode |= S_IFREG;
4212 }
4213 }
4214
4215 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c
4216 // Creates an UNC path from a single byte path. Return buffer is
4217 // allocated in C heap and needs to be freed by the caller.
4218 // Returns NULL on error.
4219 static wchar_t* create_unc_path(const char* path, errno_t &err) {
4220 wchar_t* wpath = NULL;
4221 size_t converted_chars = 0;
4222 size_t path_len = strlen(path) + 1; // includes the terminating NULL
4223 if (path[0] == '\\' && path[1] == '\\') {
4224 if (path[2] == '?' && path[3] == '\\'){
4225 // if it already has a \\?\ don't do the prefix
4226 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal);
4227 if (wpath != NULL) {
4228 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len);
4229 } else {
4230 err = ENOMEM;
4231 }
4232 } else {
4233 // only UNC pathname includes double slashes here
4234 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal);
4235 if (wpath != NULL) {
4236 ::wcscpy(wpath, L"\\\\?\\UNC\0");
4237 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len);
4238 } else {
4239 err = ENOMEM;
4240 }
4241 }
4242 } else {
4243 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal);
4244 if (wpath != NULL) {
4245 ::wcscpy(wpath, L"\\\\?\\\0");
4246 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len);
4247 } else {
4248 err = ENOMEM;
4249 }
4250 }
4251 return wpath;
4252 }
4253
4254 static void destroy_unc_path(wchar_t* wpath) {
4255 os::free(wpath);
4256 }
4257
4258 int os::stat(const char *path, struct stat *sbuf) {
4259 char* pathbuf = (char*)os::strdup(path, mtInternal);
4260 if (pathbuf == NULL) {
4261 errno = ENOMEM;
4262 return -1;
4263 }
4264 os::native_path(pathbuf);
4265 int ret;
4266 WIN32_FILE_ATTRIBUTE_DATA file_data;
4267 // Not using stat() to avoid the problem described in JDK-6539723
4268 if (strlen(path) < MAX_PATH) {
4269 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data);
4270 if (!bret) {
4271 errno = ::GetLastError();
4272 ret = -1;
4273 }
4274 else {
4275 file_attribute_data_to_stat(sbuf, file_data);
4276 ret = 0;
4277 }
4278 } else {
4279 errno_t err = ERROR_SUCCESS;
4280 wchar_t* wpath = create_unc_path(pathbuf, err);
4281 if (err != ERROR_SUCCESS) {
4282 if (wpath != NULL) {
4283 destroy_unc_path(wpath);
4284 }
4285 os::free(pathbuf);
4286 errno = err;
4287 return -1;
4288 }
4289 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data);
4290 if (!bret) {
4291 errno = ::GetLastError();
4292 ret = -1;
4293 } else {
4294 file_attribute_data_to_stat(sbuf, file_data);
4295 ret = 0;
4296 }
4297 destroy_unc_path(wpath);
4298 }
4299 os::free(pathbuf);
4300 return ret;
4301 }
4302
4303 static HANDLE create_read_only_file_handle(const char* file) {
4304 if (file == NULL) {
4305 return INVALID_HANDLE_VALUE;
4306 }
4307
4308 char* nativepath = (char*)os::strdup(file, mtInternal);
4309 if (nativepath == NULL) {
4310 errno = ENOMEM;
4311 return INVALID_HANDLE_VALUE;
4312 }
4313 os::native_path(nativepath);
4314
4315 size_t len = strlen(nativepath);
4316 HANDLE handle = INVALID_HANDLE_VALUE;
4317
4318 if (len < MAX_PATH) {
4319 handle = ::CreateFile(nativepath, 0, FILE_SHARE_READ,
4320 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4321 } else {
4322 errno_t err = ERROR_SUCCESS;
4323 wchar_t* wfile = create_unc_path(nativepath, err);
4324 if (err != ERROR_SUCCESS) {
4325 if (wfile != NULL) {
4326 destroy_unc_path(wfile);
4327 }
4328 os::free(nativepath);
4329 return INVALID_HANDLE_VALUE;
4330 }
4331 handle = ::CreateFileW(wfile, 0, FILE_SHARE_READ,
4332 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4333 destroy_unc_path(wfile);
4334 }
4335
4336 os::free(nativepath);
4337 return handle;
4338 }
4339
4340 bool os::same_files(const char* file1, const char* file2) {
4341
4342 if (file1 == NULL && file2 == NULL) {
4343 return true;
4344 }
4345
4346 if (file1 == NULL || file2 == NULL) {
4347 return false;
4348 }
4349
4350 if (strcmp(file1, file2) == 0) {
4351 return true;
4352 }
4353
4354 HANDLE handle1 = create_read_only_file_handle(file1);
4355 HANDLE handle2 = create_read_only_file_handle(file2);
4356 bool result = false;
4357
4358 // if we could open both paths...
4359 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4360 BY_HANDLE_FILE_INFORMATION fileInfo1;
4361 BY_HANDLE_FILE_INFORMATION fileInfo2;
4362 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4363 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4364 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4365 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4366 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4367 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4368 result = true;
4369 }
4370 }
4371 }
4372
4373 //free the handles
4374 if (handle1 != INVALID_HANDLE_VALUE) {
4375 ::CloseHandle(handle1);
4376 }
4377
4378 if (handle2 != INVALID_HANDLE_VALUE) {
4379 ::CloseHandle(handle2);
4380 }
4381
4382 return result;
4383 }
4384
4385
4386 #define FT2INT64(ft) \
4387 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4388
4389
4390 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4391 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4392 // of a thread.
4393 //
4394 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4395 // the fast estimate available on the platform.
4396
4397 // current_thread_cpu_time() is not optimized for Windows yet
4398 jlong os::current_thread_cpu_time() {
4399 // return user + sys since the cost is the same
4400 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4401 }
4402
4403 jlong os::thread_cpu_time(Thread* thread) {
4404 // consistent with what current_thread_cpu_time() returns.
4405 return os::thread_cpu_time(thread, true /* user+sys */);
4406 }
4407
4408 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4409 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4410 }
4411
4412 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4413 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4414 // If this function changes, os::is_thread_cpu_time_supported() should too
4415 FILETIME CreationTime;
4416 FILETIME ExitTime;
4417 FILETIME KernelTime;
4418 FILETIME UserTime;
4419
4420 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4421 &ExitTime, &KernelTime, &UserTime) == 0) {
4422 return -1;
4423 } else if (user_sys_cpu_time) {
4424 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4425 } else {
4426 return FT2INT64(UserTime) * 100;
4427 }
4428 }
4429
4430 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4431 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4432 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4433 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4434 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4435 }
4436
4437 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4438 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4439 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4440 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4441 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4442 }
4443
4444 bool os::is_thread_cpu_time_supported() {
4445 // see os::thread_cpu_time
4446 FILETIME CreationTime;
4447 FILETIME ExitTime;
4448 FILETIME KernelTime;
4449 FILETIME UserTime;
4450
4451 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4452 &KernelTime, &UserTime) == 0) {
4453 return false;
4454 } else {
4455 return true;
4456 }
4457 }
4458
4459 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4460 // It does have primitives (PDH API) to get CPU usage and run queue length.
4461 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4462 // If we wanted to implement loadavg on Windows, we have a few options:
4463 //
4464 // a) Query CPU usage and run queue length and "fake" an answer by
4465 // returning the CPU usage if it's under 100%, and the run queue
4466 // length otherwise. It turns out that querying is pretty slow
4467 // on Windows, on the order of 200 microseconds on a fast machine.
4468 // Note that on the Windows the CPU usage value is the % usage
4469 // since the last time the API was called (and the first call
4470 // returns 100%), so we'd have to deal with that as well.
4471 //
4472 // b) Sample the "fake" answer using a sampling thread and store
4473 // the answer in a global variable. The call to loadavg would
4474 // just return the value of the global, avoiding the slow query.
4475 //
4476 // c) Sample a better answer using exponential decay to smooth the
4477 // value. This is basically the algorithm used by UNIX kernels.
4478 //
4479 // Note that sampling thread starvation could affect both (b) and (c).
4480 int os::loadavg(double loadavg[], int nelem) {
4481 return -1;
4482 }
4483
4484
4485 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4486 bool os::dont_yield() {
4487 return DontYieldALot;
4488 }
4489
4490 // This method is a slightly reworked copy of JDK's sysOpen
4491 // from src/windows/hpi/src/sys_api_md.c
4492
4493 int os::open(const char *path, int oflag, int mode) {
4494 char* pathbuf = (char*)os::strdup(path, mtInternal);
4495 if (pathbuf == NULL) {
4496 errno = ENOMEM;
4497 return -1;
4498 }
4499 os::native_path(pathbuf);
4500 int ret;
4501 if (strlen(path) < MAX_PATH) {
4502 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4503 } else {
4504 errno_t err = ERROR_SUCCESS;
4505 wchar_t* wpath = create_unc_path(pathbuf, err);
4506 if (err != ERROR_SUCCESS) {
4507 if (wpath != NULL) {
4508 destroy_unc_path(wpath);
4509 }
4510 os::free(pathbuf);
4511 errno = err;
4512 return -1;
4513 }
4514 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode);
4515 if (ret == -1) {
4516 errno = ::GetLastError();
4517 }
4518 destroy_unc_path(wpath);
4519 }
4520 os::free(pathbuf);
4521 return ret;
4522 }
4523
4524 FILE* os::open(int fd, const char* mode) {
4525 return ::_fdopen(fd, mode);
4526 }
4527
4528 // Is a (classpath) directory empty?
4529 bool os::dir_is_empty(const char* path) {
4530 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
4531 if (search_path == NULL) {
4532 errno = ENOMEM;
4533 return false;
4534 }
4535 strcpy(search_path, path);
4536 os::native_path(search_path);
4537 // Append "*", or possibly "\\*", to path
4538 if (search_path[1] == ':' &&
4539 (search_path[2] == '\0' ||
4540 (search_path[2] == '\\' && search_path[3] == '\0'))) {
4541 // No '\\' needed for cases like "Z:" or "Z:\"
4542 strcat(search_path, "*");
4543 }
4544 else {
4545 strcat(search_path, "\\*");
4546 }
4547 errno_t err = ERROR_SUCCESS;
4548 wchar_t* wpath = create_unc_path(search_path, err);
4549 if (err != ERROR_SUCCESS) {
4550 if (wpath != NULL) {
4551 destroy_unc_path(wpath);
4552 }
4553 os::free(search_path);
4554 errno = err;
4555 return false;
4556 }
4557 WIN32_FIND_DATAW fd;
4558 HANDLE f = ::FindFirstFileW(wpath, &fd);
4559 destroy_unc_path(wpath);
4560 bool is_empty = true;
4561 if (f != INVALID_HANDLE_VALUE) {
4562 while (is_empty && ::FindNextFileW(f, &fd)) {
4563 // An empty directory contains only the current directory file
4564 // and the previous directory file.
4565 if ((wcscmp(fd.cFileName, L".") != 0) &&
4566 (wcscmp(fd.cFileName, L"..") != 0)) {
4567 is_empty = false;
4568 }
4569 }
4570 FindClose(f);
4571 }
4572 os::free(search_path);
4573 return is_empty;
4574 }
4575
4576 // create binary file, rewriting existing file if required
4577 int os::create_binary_file(const char* path, bool rewrite_existing) {
4578 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4579 if (!rewrite_existing) {
4580 oflags |= _O_EXCL;
4581 }
4582 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4583 }
4584
4585 // return current position of file pointer
4586 jlong os::current_file_offset(int fd) {
4587 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4588 }
4589
4590 // move file pointer to the specified offset
4591 jlong os::seek_to_file_offset(int fd, jlong offset) {
4592 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4593 }
4594
4595
4596 jlong os::lseek(int fd, jlong offset, int whence) {
4597 return (jlong) ::_lseeki64(fd, offset, whence);
4598 }
4599
4600 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4601 OVERLAPPED ov;
4602 DWORD nread;
4603 BOOL result;
4604
4605 ZeroMemory(&ov, sizeof(ov));
4606 ov.Offset = (DWORD)offset;
4607 ov.OffsetHigh = (DWORD)(offset >> 32);
4608
4609 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4610
4611 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4612
4613 return result ? nread : 0;
4614 }
4615
4616
4617 // This method is a slightly reworked copy of JDK's sysNativePath
4618 // from src/windows/hpi/src/path_md.c
4619
4620 // Convert a pathname to native format. On win32, this involves forcing all
4621 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4622 // sometimes rejects '/') and removing redundant separators. The input path is
4623 // assumed to have been converted into the character encoding used by the local
4624 // system. Because this might be a double-byte encoding, care is taken to
4625 // treat double-byte lead characters correctly.
4626 //
4627 // This procedure modifies the given path in place, as the result is never
4628 // longer than the original. There is no error return; this operation always
4629 // succeeds.
4630 char * os::native_path(char *path) {
4631 char *src = path, *dst = path, *end = path;
4632 char *colon = NULL; // If a drive specifier is found, this will
4633 // point to the colon following the drive letter
4634
4635 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4636 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4637 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4638
4639 // Check for leading separators
4640 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4641 while (isfilesep(*src)) {
4642 src++;
4643 }
4644
4645 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4646 // Remove leading separators if followed by drive specifier. This
4647 // hack is necessary to support file URLs containing drive
4648 // specifiers (e.g., "file://c:/path"). As a side effect,
4649 // "/c:/path" can be used as an alternative to "c:/path".
4650 *dst++ = *src++;
4651 colon = dst;
4652 *dst++ = ':';
4653 src++;
4654 } else {
4655 src = path;
4656 if (isfilesep(src[0]) && isfilesep(src[1])) {
4657 // UNC pathname: Retain first separator; leave src pointed at
4658 // second separator so that further separators will be collapsed
4659 // into the second separator. The result will be a pathname
4660 // beginning with "\\\\" followed (most likely) by a host name.
4661 src = dst = path + 1;
4662 path[0] = '\\'; // Force first separator to '\\'
4663 }
4664 }
4665
4666 end = dst;
4667
4668 // Remove redundant separators from remainder of path, forcing all
4669 // separators to be '\\' rather than '/'. Also, single byte space
4670 // characters are removed from the end of the path because those
4671 // are not legal ending characters on this operating system.
4672 //
4673 while (*src != '\0') {
4674 if (isfilesep(*src)) {
4675 *dst++ = '\\'; src++;
4676 while (isfilesep(*src)) src++;
4677 if (*src == '\0') {
4678 // Check for trailing separator
4679 end = dst;
4680 if (colon == dst - 2) break; // "z:\\"
4681 if (dst == path + 1) break; // "\\"
4682 if (dst == path + 2 && isfilesep(path[0])) {
4683 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4684 // beginning of a UNC pathname. Even though it is not, by
4685 // itself, a valid UNC pathname, we leave it as is in order
4686 // to be consistent with the path canonicalizer as well
4687 // as the win32 APIs, which treat this case as an invalid
4688 // UNC pathname rather than as an alias for the root
4689 // directory of the current drive.
4690 break;
4691 }
4692 end = --dst; // Path does not denote a root directory, so
4693 // remove trailing separator
4694 break;
4695 }
4696 end = dst;
4697 } else {
4698 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4699 *dst++ = *src++;
4700 if (*src) *dst++ = *src++;
4701 end = dst;
4702 } else { // Copy a single-byte character
4703 char c = *src++;
4704 *dst++ = c;
4705 // Space is not a legal ending character
4706 if (c != ' ') end = dst;
4707 }
4708 }
4709 }
4710
4711 *end = '\0';
4712
4713 // For "z:", add "." to work around a bug in the C runtime library
4714 if (colon == dst - 1) {
4715 path[2] = '.';
4716 path[3] = '\0';
4717 }
4718
4719 return path;
4720 }
4721
4722 // This code is a copy of JDK's sysSetLength
4723 // from src/windows/hpi/src/sys_api_md.c
4724
4725 int os::ftruncate(int fd, jlong length) {
4726 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4727 long high = (long)(length >> 32);
4728 DWORD ret;
4729
4730 if (h == (HANDLE)(-1)) {
4731 return -1;
4732 }
4733
4734 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4735 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4736 return -1;
4737 }
4738
4739 if (::SetEndOfFile(h) == FALSE) {
4740 return -1;
4741 }
4742
4743 return 0;
4744 }
4745
4746 int os::get_fileno(FILE* fp) {
4747 return _fileno(fp);
4748 }
4749
4750 // This code is a copy of JDK's sysSync
4751 // from src/windows/hpi/src/sys_api_md.c
4752 // except for the legacy workaround for a bug in Win 98
4753
4754 int os::fsync(int fd) {
4755 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4756
4757 if ((!::FlushFileBuffers(handle)) &&
4758 (GetLastError() != ERROR_ACCESS_DENIED)) {
4759 // from winerror.h
4760 return -1;
4761 }
4762 return 0;
4763 }
4764
4765 static int nonSeekAvailable(int, long *);
4766 static int stdinAvailable(int, long *);
4767
4768 // This code is a copy of JDK's sysAvailable
4769 // from src/windows/hpi/src/sys_api_md.c
4770
4771 int os::available(int fd, jlong *bytes) {
4772 jlong cur, end;
4773 struct _stati64 stbuf64;
4774
4775 if (::_fstati64(fd, &stbuf64) >= 0) {
4776 int mode = stbuf64.st_mode;
4777 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4778 int ret;
4779 long lpbytes;
4780 if (fd == 0) {
4781 ret = stdinAvailable(fd, &lpbytes);
4782 } else {
4783 ret = nonSeekAvailable(fd, &lpbytes);
4784 }
4785 (*bytes) = (jlong)(lpbytes);
4786 return ret;
4787 }
4788 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4789 return FALSE;
4790 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4791 return FALSE;
4792 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4793 return FALSE;
4794 }
4795 *bytes = end - cur;
4796 return TRUE;
4797 } else {
4798 return FALSE;
4799 }
4800 }
4801
4802 void os::flockfile(FILE* fp) {
4803 _lock_file(fp);
4804 }
4805
4806 void os::funlockfile(FILE* fp) {
4807 _unlock_file(fp);
4808 }
4809
4810 // This code is a copy of JDK's nonSeekAvailable
4811 // from src/windows/hpi/src/sys_api_md.c
4812
4813 static int nonSeekAvailable(int fd, long *pbytes) {
4814 // This is used for available on non-seekable devices
4815 // (like both named and anonymous pipes, such as pipes
4816 // connected to an exec'd process).
4817 // Standard Input is a special case.
4818 HANDLE han;
4819
4820 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4821 return FALSE;
4822 }
4823
4824 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4825 // PeekNamedPipe fails when at EOF. In that case we
4826 // simply make *pbytes = 0 which is consistent with the
4827 // behavior we get on Solaris when an fd is at EOF.
4828 // The only alternative is to raise an Exception,
4829 // which isn't really warranted.
4830 //
4831 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4832 return FALSE;
4833 }
4834 *pbytes = 0;
4835 }
4836 return TRUE;
4837 }
4838
4839 #define MAX_INPUT_EVENTS 2000
4840
4841 // This code is a copy of JDK's stdinAvailable
4842 // from src/windows/hpi/src/sys_api_md.c
4843
4844 static int stdinAvailable(int fd, long *pbytes) {
4845 HANDLE han;
4846 DWORD numEventsRead = 0; // Number of events read from buffer
4847 DWORD numEvents = 0; // Number of events in buffer
4848 DWORD i = 0; // Loop index
4849 DWORD curLength = 0; // Position marker
4850 DWORD actualLength = 0; // Number of bytes readable
4851 BOOL error = FALSE; // Error holder
4852 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4853
4854 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4855 return FALSE;
4856 }
4857
4858 // Construct an array of input records in the console buffer
4859 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4860 if (error == 0) {
4861 return nonSeekAvailable(fd, pbytes);
4862 }
4863
4864 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4865 if (numEvents > MAX_INPUT_EVENTS) {
4866 numEvents = MAX_INPUT_EVENTS;
4867 }
4868
4869 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4870 if (lpBuffer == NULL) {
4871 return FALSE;
4872 }
4873
4874 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4875 if (error == 0) {
4876 os::free(lpBuffer);
4877 return FALSE;
4878 }
4879
4880 // Examine input records for the number of bytes available
4881 for (i=0; i<numEvents; i++) {
4882 if (lpBuffer[i].EventType == KEY_EVENT) {
4883
4884 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4885 &(lpBuffer[i].Event);
4886 if (keyRecord->bKeyDown == TRUE) {
4887 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4888 curLength++;
4889 if (*keyPressed == '\r') {
4890 actualLength = curLength;
4891 }
4892 }
4893 }
4894 }
4895
4896 if (lpBuffer != NULL) {
4897 os::free(lpBuffer);
4898 }
4899
4900 *pbytes = (long) actualLength;
4901 return TRUE;
4902 }
4903
4904 // Map a block of memory.
4905 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4906 char *addr, size_t bytes, bool read_only,
4907 bool allow_exec) {
4908 HANDLE hFile;
4909 char* base;
4910
4911 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4912 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4913 if (hFile == NULL) {
4914 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4915 return NULL;
4916 }
4917
4918 if (allow_exec) {
4919 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4920 // unless it comes from a PE image (which the shared archive is not.)
4921 // Even VirtualProtect refuses to give execute access to mapped memory
4922 // that was not previously executable.
4923 //
4924 // Instead, stick the executable region in anonymous memory. Yuck.
4925 // Penalty is that ~4 pages will not be shareable - in the future
4926 // we might consider DLLizing the shared archive with a proper PE
4927 // header so that mapping executable + sharing is possible.
4928
4929 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4930 PAGE_READWRITE);
4931 if (base == NULL) {
4932 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4933 CloseHandle(hFile);
4934 return NULL;
4935 }
4936
4937 // Record virtual memory allocation
4938 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
4939
4940 DWORD bytes_read;
4941 OVERLAPPED overlapped;
4942 overlapped.Offset = (DWORD)file_offset;
4943 overlapped.OffsetHigh = 0;
4944 overlapped.hEvent = NULL;
4945 // ReadFile guarantees that if the return value is true, the requested
4946 // number of bytes were read before returning.
4947 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4948 if (!res) {
4949 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4950 release_memory(base, bytes);
4951 CloseHandle(hFile);
4952 return NULL;
4953 }
4954 } else {
4955 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4956 NULL /* file_name */);
4957 if (hMap == NULL) {
4958 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4959 CloseHandle(hFile);
4960 return NULL;
4961 }
4962
4963 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4964 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4965 (DWORD)bytes, addr);
4966 if (base == NULL) {
4967 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4968 CloseHandle(hMap);
4969 CloseHandle(hFile);
4970 return NULL;
4971 }
4972
4973 if (CloseHandle(hMap) == 0) {
4974 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4975 CloseHandle(hFile);
4976 return base;
4977 }
4978 }
4979
4980 if (allow_exec) {
4981 DWORD old_protect;
4982 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4983 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4984
4985 if (!res) {
4986 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4987 // Don't consider this a hard error, on IA32 even if the
4988 // VirtualProtect fails, we should still be able to execute
4989 CloseHandle(hFile);
4990 return base;
4991 }
4992 }
4993
4994 if (CloseHandle(hFile) == 0) {
4995 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4996 return base;
4997 }
4998
4999 return base;
5000 }
5001
5002
5003 // Remap a block of memory.
5004 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5005 char *addr, size_t bytes, bool read_only,
5006 bool allow_exec) {
5007 // This OS does not allow existing memory maps to be remapped so we
5008 // would have to unmap the memory before we remap it.
5009
5010 // Because there is a small window between unmapping memory and mapping
5011 // it in again with different protections, CDS archives are mapped RW
5012 // on windows, so this function isn't called.
5013 ShouldNotReachHere();
5014 return NULL;
5015 }
5016
5017
5018 // Unmap a block of memory.
5019 // Returns true=success, otherwise false.
5020
5021 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5022 MEMORY_BASIC_INFORMATION mem_info;
5023 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5024 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5025 return false;
5026 }
5027
5028 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5029 // Instead, executable region was allocated using VirtualAlloc(). See
5030 // pd_map_memory() above.
5031 //
5032 // The following flags should match the 'exec_access' flages used for
5033 // VirtualProtect() in pd_map_memory().
5034 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5035 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5036 return pd_release_memory(addr, bytes);
5037 }
5038
5039 BOOL result = UnmapViewOfFile(addr);
5040 if (result == 0) {
5041 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5042 return false;
5043 }
5044 return true;
5045 }
5046
5047 void os::pause() {
5048 char filename[MAX_PATH];
5049 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5050 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5051 } else {
5052 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5053 }
5054
5055 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5056 if (fd != -1) {
5057 struct stat buf;
5058 ::close(fd);
5059 while (::stat(filename, &buf) == 0) {
5060 Sleep(100);
5061 }
5062 } else {
5063 jio_fprintf(stderr,
5064 "Could not open pause file '%s', continuing immediately.\n", filename);
5065 }
5066 }
5067
5068 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5069 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5070 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5071
5072 os::ThreadCrashProtection::ThreadCrashProtection() {
5073 }
5074
5075 // See the caveats for this class in os_windows.hpp
5076 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5077 // into this method and returns false. If no OS EXCEPTION was raised, returns
5078 // true.
5079 // The callback is supposed to provide the method that should be protected.
5080 //
5081 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5082
5083 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5084
5085 _protected_thread = Thread::current_or_null();
5086 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5087
5088 bool success = true;
5089 __try {
5090 _crash_protection = this;
5091 cb.call();
5092 } __except(EXCEPTION_EXECUTE_HANDLER) {
5093 // only for protection, nothing to do
5094 success = false;
5095 }
5096 _crash_protection = NULL;
5097 _protected_thread = NULL;
5098 Thread::muxRelease(&_crash_mux);
5099 return success;
5100 }
5101
5102
5103 class HighResolutionInterval : public CHeapObj<mtThread> {
5104 // The default timer resolution seems to be 10 milliseconds.
5105 // (Where is this written down?)
5106 // If someone wants to sleep for only a fraction of the default,
5107 // then we set the timer resolution down to 1 millisecond for
5108 // the duration of their interval.
5109 // We carefully set the resolution back, since otherwise we
5110 // seem to incur an overhead (3%?) that we don't need.
5111 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5112 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5113 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5114 // timeBeginPeriod() if the relative error exceeded some threshold.
5115 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5116 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5117 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5118 // resolution timers running.
5119 private:
5120 jlong resolution;
5121 public:
5122 HighResolutionInterval(jlong ms) {
5123 resolution = ms % 10L;
5124 if (resolution != 0) {
5125 MMRESULT result = timeBeginPeriod(1L);
5126 }
5127 }
5128 ~HighResolutionInterval() {
5129 if (resolution != 0) {
5130 MMRESULT result = timeEndPeriod(1L);
5131 }
5132 resolution = 0L;
5133 }
5134 };
5135
5136 // An Event wraps a win32 "CreateEvent" kernel handle.
5137 //
5138 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5139 //
5140 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5141 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5142 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5143 // In addition, an unpark() operation might fetch the handle field, but the
5144 // event could recycle between the fetch and the SetEvent() operation.
5145 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5146 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5147 // on an stale but recycled handle would be harmless, but in practice this might
5148 // confuse other non-Sun code, so it's not a viable approach.
5149 //
5150 // 2: Once a win32 event handle is associated with an Event, it remains associated
5151 // with the Event. The event handle is never closed. This could be construed
5152 // as handle leakage, but only up to the maximum # of threads that have been extant
5153 // at any one time. This shouldn't be an issue, as windows platforms typically
5154 // permit a process to have hundreds of thousands of open handles.
5155 //
5156 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5157 // and release unused handles.
5158 //
5159 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5160 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5161 //
5162 // 5. Use an RCU-like mechanism (Read-Copy Update).
5163 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5164 //
5165 // We use (2).
5166 //
5167 // TODO-FIXME:
5168 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5169 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5170 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5171 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5172 // into a single win32 CreateEvent() handle.
5173 //
5174 // Assumption:
5175 // Only one parker can exist on an event, which is why we allocate
5176 // them per-thread. Multiple unparkers can coexist.
5177 //
5178 // _Event transitions in park()
5179 // -1 => -1 : illegal
5180 // 1 => 0 : pass - return immediately
5181 // 0 => -1 : block; then set _Event to 0 before returning
5182 //
5183 // _Event transitions in unpark()
5184 // 0 => 1 : just return
5185 // 1 => 1 : just return
5186 // -1 => either 0 or 1; must signal target thread
5187 // That is, we can safely transition _Event from -1 to either
5188 // 0 or 1.
5189 //
5190 // _Event serves as a restricted-range semaphore.
5191 // -1 : thread is blocked, i.e. there is a waiter
5192 // 0 : neutral: thread is running or ready,
5193 // could have been signaled after a wait started
5194 // 1 : signaled - thread is running or ready
5195 //
5196 // Another possible encoding of _Event would be with
5197 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5198 //
5199
5200 int os::PlatformEvent::park(jlong Millis) {
5201 // Transitions for _Event:
5202 // -1 => -1 : illegal
5203 // 1 => 0 : pass - return immediately
5204 // 0 => -1 : block; then set _Event to 0 before returning
5205
5206 guarantee(_ParkHandle != NULL , "Invariant");
5207 guarantee(Millis > 0 , "Invariant");
5208
5209 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5210 // the initial park() operation.
5211 // Consider: use atomic decrement instead of CAS-loop
5212
5213 int v;
5214 for (;;) {
5215 v = _Event;
5216 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5217 }
5218 guarantee((v == 0) || (v == 1), "invariant");
5219 if (v != 0) return OS_OK;
5220
5221 // Do this the hard way by blocking ...
5222 // TODO: consider a brief spin here, gated on the success of recent
5223 // spin attempts by this thread.
5224 //
5225 // We decompose long timeouts into series of shorter timed waits.
5226 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5227 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5228 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5229 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5230 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5231 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5232 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5233 // for the already waited time. This policy does not admit any new outcomes.
5234 // In the future, however, we might want to track the accumulated wait time and
5235 // adjust Millis accordingly if we encounter a spurious wakeup.
5236
5237 const int MAXTIMEOUT = 0x10000000;
5238 DWORD rv = WAIT_TIMEOUT;
5239 while (_Event < 0 && Millis > 0) {
5240 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5241 if (Millis > MAXTIMEOUT) {
5242 prd = MAXTIMEOUT;
5243 }
5244 HighResolutionInterval *phri = NULL;
5245 if (!ForceTimeHighResolution) {
5246 phri = new HighResolutionInterval(prd);
5247 }
5248 rv = ::WaitForSingleObject(_ParkHandle, prd);
5249 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5250 if (rv == WAIT_TIMEOUT) {
5251 Millis -= prd;
5252 }
5253 delete phri; // if it is NULL, harmless
5254 }
5255 v = _Event;
5256 _Event = 0;
5257 // see comment at end of os::PlatformEvent::park() below:
5258 OrderAccess::fence();
5259 // If we encounter a nearly simultanous timeout expiry and unpark()
5260 // we return OS_OK indicating we awoke via unpark().
5261 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5262 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5263 }
5264
5265 void os::PlatformEvent::park() {
5266 // Transitions for _Event:
5267 // -1 => -1 : illegal
5268 // 1 => 0 : pass - return immediately
5269 // 0 => -1 : block; then set _Event to 0 before returning
5270
5271 guarantee(_ParkHandle != NULL, "Invariant");
5272 // Invariant: Only the thread associated with the Event/PlatformEvent
5273 // may call park().
5274 // Consider: use atomic decrement instead of CAS-loop
5275 int v;
5276 for (;;) {
5277 v = _Event;
5278 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5279 }
5280 guarantee((v == 0) || (v == 1), "invariant");
5281 if (v != 0) return;
5282
5283 // Do this the hard way by blocking ...
5284 // TODO: consider a brief spin here, gated on the success of recent
5285 // spin attempts by this thread.
5286 while (_Event < 0) {
5287 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5288 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5289 }
5290
5291 // Usually we'll find _Event == 0 at this point, but as
5292 // an optional optimization we clear it, just in case can
5293 // multiple unpark() operations drove _Event up to 1.
5294 _Event = 0;
5295 OrderAccess::fence();
5296 guarantee(_Event >= 0, "invariant");
5297 }
5298
5299 void os::PlatformEvent::unpark() {
5300 guarantee(_ParkHandle != NULL, "Invariant");
5301
5302 // Transitions for _Event:
5303 // 0 => 1 : just return
5304 // 1 => 1 : just return
5305 // -1 => either 0 or 1; must signal target thread
5306 // That is, we can safely transition _Event from -1 to either
5307 // 0 or 1.
5308 // See also: "Semaphores in Plan 9" by Mullender & Cox
5309 //
5310 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5311 // that it will take two back-to-back park() calls for the owning
5312 // thread to block. This has the benefit of forcing a spurious return
5313 // from the first park() call after an unpark() call which will help
5314 // shake out uses of park() and unpark() without condition variables.
5315
5316 if (Atomic::xchg(1, &_Event) >= 0) return;
5317
5318 ::SetEvent(_ParkHandle);
5319 }
5320
5321
5322 // JSR166
5323 // -------------------------------------------------------
5324
5325 // The Windows implementation of Park is very straightforward: Basic
5326 // operations on Win32 Events turn out to have the right semantics to
5327 // use them directly. We opportunistically resuse the event inherited
5328 // from Monitor.
5329
5330 void Parker::park(bool isAbsolute, jlong time) {
5331 guarantee(_ParkEvent != NULL, "invariant");
5332 // First, demultiplex/decode time arguments
5333 if (time < 0) { // don't wait
5334 return;
5335 } else if (time == 0 && !isAbsolute) {
5336 time = INFINITE;
5337 } else if (isAbsolute) {
5338 time -= os::javaTimeMillis(); // convert to relative time
5339 if (time <= 0) { // already elapsed
5340 return;
5341 }
5342 } else { // relative
5343 time /= 1000000; // Must coarsen from nanos to millis
5344 if (time == 0) { // Wait for the minimal time unit if zero
5345 time = 1;
5346 }
5347 }
5348
5349 JavaThread* thread = JavaThread::current();
5350
5351 // Don't wait if interrupted or already triggered
5352 if (Thread::is_interrupted(thread, false) ||
5353 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5354 ResetEvent(_ParkEvent);
5355 return;
5356 } else {
5357 ThreadBlockInVM tbivm(thread);
5358 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5359 thread->set_suspend_equivalent();
5360
5361 WaitForSingleObject(_ParkEvent, time);
5362 ResetEvent(_ParkEvent);
5363
5364 // If externally suspended while waiting, re-suspend
5365 if (thread->handle_special_suspend_equivalent_condition()) {
5366 thread->java_suspend_self();
5367 }
5368 }
5369 }
5370
5371 void Parker::unpark() {
5372 guarantee(_ParkEvent != NULL, "invariant");
5373 SetEvent(_ParkEvent);
5374 }
5375
5376 // Platform Monitor implementation
5377
5378 // Must already be locked
5379 int os::PlatformMonitor::wait(jlong millis) {
5380 assert(millis >= 0, "negative timeout");
5381 int ret = OS_TIMEOUT;
5382 int status = SleepConditionVariableCS(&_cond, &_mutex,
5383 millis == 0 ? INFINITE : millis);
5384 if (status != 0) {
5385 ret = OS_OK;
5386 }
5387 #ifndef PRODUCT
5388 else {
5389 DWORD err = GetLastError();
5390 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5391 }
5392 #endif
5393 return ret;
5394 }
5395
5396 // Run the specified command in a separate process. Return its exit value,
5397 // or -1 on failure (e.g. can't create a new process).
5398 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5399 STARTUPINFO si;
5400 PROCESS_INFORMATION pi;
5401 DWORD exit_code;
5402
5403 char * cmd_string;
5404 const char * cmd_prefix = "cmd /C ";
5405 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5406 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5407 if (cmd_string == NULL) {
5408 return -1;
5409 }
5410 cmd_string[0] = '\0';
5411 strcat(cmd_string, cmd_prefix);
5412 strcat(cmd_string, cmd);
5413
5414 // now replace all '\n' with '&'
5415 char * substring = cmd_string;
5416 while ((substring = strchr(substring, '\n')) != NULL) {
5417 substring[0] = '&';
5418 substring++;
5419 }
5420 memset(&si, 0, sizeof(si));
5421 si.cb = sizeof(si);
5422 memset(&pi, 0, sizeof(pi));
5423 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5424 cmd_string, // command line
5425 NULL, // process security attribute
5426 NULL, // thread security attribute
5427 TRUE, // inherits system handles
5428 0, // no creation flags
5429 NULL, // use parent's environment block
5430 NULL, // use parent's starting directory
5431 &si, // (in) startup information
5432 &pi); // (out) process information
5433
5434 if (rslt) {
5435 // Wait until child process exits.
5436 WaitForSingleObject(pi.hProcess, INFINITE);
5437
5438 GetExitCodeProcess(pi.hProcess, &exit_code);
5439
5440 // Close process and thread handles.
5441 CloseHandle(pi.hProcess);
5442 CloseHandle(pi.hThread);
5443 } else {
5444 exit_code = -1;
5445 }
5446
5447 FREE_C_HEAP_ARRAY(char, cmd_string);
5448 return (int)exit_code;
5449 }
5450
5451 bool os::find(address addr, outputStream* st) {
5452 int offset = -1;
5453 bool result = false;
5454 char buf[256];
5455 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5456 st->print(PTR_FORMAT " ", addr);
5457 if (strlen(buf) < sizeof(buf) - 1) {
5458 char* p = strrchr(buf, '\\');
5459 if (p) {
5460 st->print("%s", p + 1);
5461 } else {
5462 st->print("%s", buf);
5463 }
5464 } else {
5465 // The library name is probably truncated. Let's omit the library name.
5466 // See also JDK-8147512.
5467 }
5468 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5469 st->print("::%s + 0x%x", buf, offset);
5470 }
5471 st->cr();
5472 result = true;
5473 }
5474 return result;
5475 }
5476
5477 static jint initSock() {
5478 WSADATA wsadata;
5479
5480 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5481 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5482 ::GetLastError());
5483 return JNI_ERR;
5484 }
5485 return JNI_OK;
5486 }
5487
5488 struct hostent* os::get_host_by_name(char* name) {
5489 return (struct hostent*)gethostbyname(name);
5490 }
5491
5492 int os::socket_close(int fd) {
5493 return ::closesocket(fd);
5494 }
5495
5496 int os::socket(int domain, int type, int protocol) {
5497 return ::socket(domain, type, protocol);
5498 }
5499
5500 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5501 return ::connect(fd, him, len);
5502 }
5503
5504 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5505 return ::recv(fd, buf, (int)nBytes, flags);
5506 }
5507
5508 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5509 return ::send(fd, buf, (int)nBytes, flags);
5510 }
5511
5512 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5513 return ::send(fd, buf, (int)nBytes, flags);
5514 }
5515
5516 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5517 #if defined(IA32)
5518 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5519 #elif defined (AMD64)
5520 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5521 #endif
5522
5523 // returns true if thread could be suspended,
5524 // false otherwise
5525 static bool do_suspend(HANDLE* h) {
5526 if (h != NULL) {
5527 if (SuspendThread(*h) != ~0) {
5528 return true;
5529 }
5530 }
5531 return false;
5532 }
5533
5534 // resume the thread
5535 // calling resume on an active thread is a no-op
5536 static void do_resume(HANDLE* h) {
5537 if (h != NULL) {
5538 ResumeThread(*h);
5539 }
5540 }
5541
5542 // retrieve a suspend/resume context capable handle
5543 // from the tid. Caller validates handle return value.
5544 void get_thread_handle_for_extended_context(HANDLE* h,
5545 OSThread::thread_id_t tid) {
5546 if (h != NULL) {
5547 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5548 }
5549 }
5550
5551 // Thread sampling implementation
5552 //
5553 void os::SuspendedThreadTask::internal_do_task() {
5554 CONTEXT ctxt;
5555 HANDLE h = NULL;
5556
5557 // get context capable handle for thread
5558 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5559
5560 // sanity
5561 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5562 return;
5563 }
5564
5565 // suspend the thread
5566 if (do_suspend(&h)) {
5567 ctxt.ContextFlags = sampling_context_flags;
5568 // get thread context
5569 GetThreadContext(h, &ctxt);
5570 SuspendedThreadTaskContext context(_thread, &ctxt);
5571 // pass context to Thread Sampling impl
5572 do_task(context);
5573 // resume thread
5574 do_resume(&h);
5575 }
5576
5577 // close handle
5578 CloseHandle(h);
5579 }
5580
5581 bool os::start_debugging(char *buf, int buflen) {
5582 int len = (int)strlen(buf);
5583 char *p = &buf[len];
5584
5585 jio_snprintf(p, buflen-len,
5586 "\n\n"
5587 "Do you want to debug the problem?\n\n"
5588 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5589 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5590 "Otherwise, select 'No' to abort...",
5591 os::current_process_id(), os::current_thread_id());
5592
5593 bool yes = os::message_box("Unexpected Error", buf);
5594
5595 if (yes) {
5596 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5597 // exception. If VM is running inside a debugger, the debugger will
5598 // catch the exception. Otherwise, the breakpoint exception will reach
5599 // the default windows exception handler, which can spawn a debugger and
5600 // automatically attach to the dying VM.
5601 os::breakpoint();
5602 yes = false;
5603 }
5604 return yes;
5605 }
5606
5607 void* os::get_default_process_handle() {
5608 return (void*)GetModuleHandle(NULL);
5609 }
5610
5611 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5612 // which is used to find statically linked in agents.
5613 // Additionally for windows, takes into account __stdcall names.
5614 // Parameters:
5615 // sym_name: Symbol in library we are looking for
5616 // lib_name: Name of library to look in, NULL for shared libs.
5617 // is_absolute_path == true if lib_name is absolute path to agent
5618 // such as "C:/a/b/L.dll"
5619 // == false if only the base name of the library is passed in
5620 // such as "L"
5621 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5622 bool is_absolute_path) {
5623 char *agent_entry_name;
5624 size_t len;
5625 size_t name_len;
5626 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5627 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5628 const char *start;
5629
5630 if (lib_name != NULL) {
5631 len = name_len = strlen(lib_name);
5632 if (is_absolute_path) {
5633 // Need to strip path, prefix and suffix
5634 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5635 lib_name = ++start;
5636 } else {
5637 // Need to check for drive prefix
5638 if ((start = strchr(lib_name, ':')) != NULL) {
5639 lib_name = ++start;
5640 }
5641 }
5642 if (len <= (prefix_len + suffix_len)) {
5643 return NULL;
5644 }
5645 lib_name += prefix_len;
5646 name_len = strlen(lib_name) - suffix_len;
5647 }
5648 }
5649 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5650 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5651 if (agent_entry_name == NULL) {
5652 return NULL;
5653 }
5654 if (lib_name != NULL) {
5655 const char *p = strrchr(sym_name, '@');
5656 if (p != NULL && p != sym_name) {
5657 // sym_name == _Agent_OnLoad@XX
5658 strncpy(agent_entry_name, sym_name, (p - sym_name));
5659 agent_entry_name[(p-sym_name)] = '\0';
5660 // agent_entry_name == _Agent_OnLoad
5661 strcat(agent_entry_name, "_");
5662 strncat(agent_entry_name, lib_name, name_len);
5663 strcat(agent_entry_name, p);
5664 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5665 } else {
5666 strcpy(agent_entry_name, sym_name);
5667 strcat(agent_entry_name, "_");
5668 strncat(agent_entry_name, lib_name, name_len);
5669 }
5670 } else {
5671 strcpy(agent_entry_name, sym_name);
5672 }
5673 return agent_entry_name;
5674 }
5675
5676 #ifndef PRODUCT
5677
5678 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5679 // contiguous memory block at a particular address.
5680 // The test first tries to find a good approximate address to allocate at by using the same
5681 // method to allocate some memory at any address. The test then tries to allocate memory in
5682 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5683 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5684 // the previously allocated memory is available for allocation. The only actual failure
5685 // that is reported is when the test tries to allocate at a particular location but gets a
5686 // different valid one. A NULL return value at this point is not considered an error but may
5687 // be legitimate.
5688 void TestReserveMemorySpecial_test() {
5689 if (!UseLargePages) {
5690 return;
5691 }
5692 // save current value of globals
5693 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5694 bool old_use_numa_interleaving = UseNUMAInterleaving;
5695
5696 // set globals to make sure we hit the correct code path
5697 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5698
5699 // do an allocation at an address selected by the OS to get a good one.
5700 const size_t large_allocation_size = os::large_page_size() * 4;
5701 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5702 if (result == NULL) {
5703 } else {
5704 os::release_memory_special(result, large_allocation_size);
5705
5706 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5707 // we managed to get it once.
5708 const size_t expected_allocation_size = os::large_page_size();
5709 char* expected_location = result + os::large_page_size();
5710 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5711 if (actual_location == NULL) {
5712 } else {
5713 // release memory
5714 os::release_memory_special(actual_location, expected_allocation_size);
5715 // only now check, after releasing any memory to avoid any leaks.
5716 assert(actual_location == expected_location,
5717 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5718 expected_location, expected_allocation_size, actual_location);
5719 }
5720 }
5721
5722 // restore globals
5723 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5724 UseNUMAInterleaving = old_use_numa_interleaving;
5725 }
5726 #endif // PRODUCT
5727
5728 /*
5729 All the defined signal names for Windows.
5730
5731 NOTE that not all of these names are accepted by FindSignal!
5732
5733 For various reasons some of these may be rejected at runtime.
5734
5735 Here are the names currently accepted by a user of sun.misc.Signal with
5736 1.4.1 (ignoring potential interaction with use of chaining, etc):
5737
5738 (LIST TBD)
5739
5740 */
5741 int os::get_signal_number(const char* name) {
5742 static const struct {
5743 const char* name;
5744 int number;
5745 } siglabels [] =
5746 // derived from version 6.0 VC98/include/signal.h
5747 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5748 "FPE", SIGFPE, // floating point exception
5749 "SEGV", SIGSEGV, // segment violation
5750 "INT", SIGINT, // interrupt
5751 "TERM", SIGTERM, // software term signal from kill
5752 "BREAK", SIGBREAK, // Ctrl-Break sequence
5753 "ILL", SIGILL}; // illegal instruction
5754 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5755 if (strcmp(name, siglabels[i].name) == 0) {
5756 return siglabels[i].number;
5757 }
5758 }
5759 return -1;
5760 }
5761
5762 // Fast current thread access
5763
5764 int os::win32::_thread_ptr_offset = 0;
5765
5766 static void call_wrapper_dummy() {}
5767
5768 // We need to call the os_exception_wrapper once so that it sets
5769 // up the offset from FS of the thread pointer.
5770 void os::win32::initialize_thread_ptr_offset() {
5771 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5772 NULL, NULL, NULL, NULL);
5773 }
5774
5775 bool os::supports_map_sync() {
5776 return false;
5777 }