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 // We don't call set_interrupted(false) as it will trip the assert in there
616 // as we are not operating on the current thread. We don't need to call it
617 // because the initial state is already correct.
618
619 thread->set_osthread(osthread);
620
621 if (stack_size == 0) {
622 switch (thr_type) {
623 case os::java_thread:
624 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
625 if (JavaThread::stack_size_at_create() > 0) {
626 stack_size = JavaThread::stack_size_at_create();
627 }
628 break;
629 case os::compiler_thread:
630 if (CompilerThreadStackSize > 0) {
631 stack_size = (size_t)(CompilerThreadStackSize * K);
632 break;
633 } // else fall through:
634 // use VMThreadStackSize if CompilerThreadStackSize is not defined
635 case os::vm_thread:
636 case os::pgc_thread:
637 case os::cgc_thread:
638 case os::watcher_thread:
639 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
640 break;
641 }
642 }
643
644 // Create the Win32 thread
645 //
646 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
647 // does not specify stack size. Instead, it specifies the size of
648 // initially committed space. The stack size is determined by
649 // PE header in the executable. If the committed "stack_size" is larger
650 // than default value in the PE header, the stack is rounded up to the
651 // nearest multiple of 1MB. For example if the launcher has default
652 // stack size of 320k, specifying any size less than 320k does not
653 // affect the actual stack size at all, it only affects the initial
654 // commitment. On the other hand, specifying 'stack_size' larger than
655 // default value may cause significant increase in memory usage, because
656 // not only the stack space will be rounded up to MB, but also the
657 // entire space is committed upfront.
658 //
659 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
660 // for CreateThread() that can treat 'stack_size' as stack size. However we
661 // are not supposed to call CreateThread() directly according to MSDN
662 // document because JVM uses C runtime library. The good news is that the
663 // flag appears to work with _beginthredex() as well.
664
665 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
666 HANDLE thread_handle =
667 (HANDLE)_beginthreadex(NULL,
668 (unsigned)stack_size,
669 (unsigned (__stdcall *)(void*)) thread_native_entry,
670 thread,
671 initflag,
672 &thread_id);
673
674 char buf[64];
675 if (thread_handle != NULL) {
676 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
677 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
678 } else {
679 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
680 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
681 // Log some OS information which might explain why creating the thread failed.
682 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
683 LogStream st(Log(os, thread)::info());
684 os::print_memory_info(&st);
685 }
686
687 if (thread_handle == NULL) {
688 // Need to clean up stuff we've allocated so far
689 thread->set_osthread(NULL);
690 delete osthread;
691 return false;
692 }
693
694 Atomic::inc(&os::win32::_os_thread_count);
695
696 // Store info on the Win32 thread into the OSThread
697 osthread->set_thread_handle(thread_handle);
698 osthread->set_thread_id(thread_id);
699
700 // Initial thread state is INITIALIZED, not SUSPENDED
701 osthread->set_state(INITIALIZED);
702
703 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
704 return true;
705 }
706
707
708 // Free Win32 resources related to the OSThread
709 void os::free_thread(OSThread* osthread) {
710 assert(osthread != NULL, "osthread not set");
711
712 // We are told to free resources of the argument thread,
713 // but we can only really operate on the current thread.
714 assert(Thread::current()->osthread() == osthread,
715 "os::free_thread but not current thread");
716
717 CloseHandle(osthread->thread_handle());
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 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2731 }
2732
2733 public:
2734 NUMANodeListHolder() {
2735 _numa_used_node_count = 0;
2736 _numa_used_node_list = NULL;
2737 // do rest of initialization in build routine (after function pointers are set up)
2738 }
2739
2740 ~NUMANodeListHolder() {
2741 free_node_list();
2742 }
2743
2744 bool build() {
2745 DWORD_PTR proc_aff_mask;
2746 DWORD_PTR sys_aff_mask;
2747 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2748 ULONG highest_node_number;
2749 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2750 free_node_list();
2751 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2752 for (unsigned int i = 0; i <= highest_node_number; i++) {
2753 ULONGLONG proc_mask_numa_node;
2754 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2755 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2756 _numa_used_node_list[_numa_used_node_count++] = i;
2757 }
2758 }
2759 return (_numa_used_node_count > 1);
2760 }
2761
2762 int get_count() { return _numa_used_node_count; }
2763 int get_node_list_entry(int n) {
2764 // for indexes out of range, returns -1
2765 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2766 }
2767
2768 } numa_node_list_holder;
2769
2770
2771
2772 static size_t _large_page_size = 0;
2773
2774 static bool request_lock_memory_privilege() {
2775 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2776 os::current_process_id());
2777
2778 LUID luid;
2779 if (_hProcess != NULL &&
2780 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2781 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2782
2783 TOKEN_PRIVILEGES tp;
2784 tp.PrivilegeCount = 1;
2785 tp.Privileges[0].Luid = luid;
2786 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2787
2788 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2789 // privilege. Check GetLastError() too. See MSDN document.
2790 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2791 (GetLastError() == ERROR_SUCCESS)) {
2792 return true;
2793 }
2794 }
2795
2796 return false;
2797 }
2798
2799 static void cleanup_after_large_page_init() {
2800 if (_hProcess) CloseHandle(_hProcess);
2801 _hProcess = NULL;
2802 if (_hToken) CloseHandle(_hToken);
2803 _hToken = NULL;
2804 }
2805
2806 static bool numa_interleaving_init() {
2807 bool success = false;
2808 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2809
2810 // print a warning if UseNUMAInterleaving flag is specified on command line
2811 bool warn_on_failure = use_numa_interleaving_specified;
2812 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2813
2814 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2815 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2816 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2817
2818 if (numa_node_list_holder.build()) {
2819 if (log_is_enabled(Debug, os, cpu)) {
2820 Log(os, cpu) log;
2821 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2822 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2823 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2824 }
2825 }
2826 success = true;
2827 } else {
2828 WARN("Process does not cover multiple NUMA nodes.");
2829 }
2830 if (!success) {
2831 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2832 }
2833 return success;
2834 #undef WARN
2835 }
2836
2837 // this routine is used whenever we need to reserve a contiguous VA range
2838 // but we need to make separate VirtualAlloc calls for each piece of the range
2839 // Reasons for doing this:
2840 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2841 // * UseNUMAInterleaving requires a separate node for each piece
2842 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2843 DWORD prot,
2844 bool should_inject_error = false) {
2845 char * p_buf;
2846 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2847 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2848 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2849
2850 // first reserve enough address space in advance since we want to be
2851 // able to break a single contiguous virtual address range into multiple
2852 // large page commits but WS2003 does not allow reserving large page space
2853 // so we just use 4K pages for reserve, this gives us a legal contiguous
2854 // address space. then we will deallocate that reservation, and re alloc
2855 // using large pages
2856 const size_t size_of_reserve = bytes + chunk_size;
2857 if (bytes > size_of_reserve) {
2858 // Overflowed.
2859 return NULL;
2860 }
2861 p_buf = (char *) VirtualAlloc(addr,
2862 size_of_reserve, // size of Reserve
2863 MEM_RESERVE,
2864 PAGE_READWRITE);
2865 // If reservation failed, return NULL
2866 if (p_buf == NULL) return NULL;
2867 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2868 os::release_memory(p_buf, bytes + chunk_size);
2869
2870 // we still need to round up to a page boundary (in case we are using large pages)
2871 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2872 // instead we handle this in the bytes_to_rq computation below
2873 p_buf = align_up(p_buf, page_size);
2874
2875 // now go through and allocate one chunk at a time until all bytes are
2876 // allocated
2877 size_t bytes_remaining = bytes;
2878 // An overflow of align_up() would have been caught above
2879 // in the calculation of size_of_reserve.
2880 char * next_alloc_addr = p_buf;
2881 HANDLE hProc = GetCurrentProcess();
2882
2883 #ifdef ASSERT
2884 // Variable for the failure injection
2885 int ran_num = os::random();
2886 size_t fail_after = ran_num % bytes;
2887 #endif
2888
2889 int count=0;
2890 while (bytes_remaining) {
2891 // select bytes_to_rq to get to the next chunk_size boundary
2892
2893 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2894 // Note allocate and commit
2895 char * p_new;
2896
2897 #ifdef ASSERT
2898 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2899 #else
2900 const bool inject_error_now = false;
2901 #endif
2902
2903 if (inject_error_now) {
2904 p_new = NULL;
2905 } else {
2906 if (!UseNUMAInterleaving) {
2907 p_new = (char *) VirtualAlloc(next_alloc_addr,
2908 bytes_to_rq,
2909 flags,
2910 prot);
2911 } else {
2912 // get the next node to use from the used_node_list
2913 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2914 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2915 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2916 }
2917 }
2918
2919 if (p_new == NULL) {
2920 // Free any allocated pages
2921 if (next_alloc_addr > p_buf) {
2922 // Some memory was committed so release it.
2923 size_t bytes_to_release = bytes - bytes_remaining;
2924 // NMT has yet to record any individual blocks, so it
2925 // need to create a dummy 'reserve' record to match
2926 // the release.
2927 MemTracker::record_virtual_memory_reserve((address)p_buf,
2928 bytes_to_release, CALLER_PC);
2929 os::release_memory(p_buf, bytes_to_release);
2930 }
2931 #ifdef ASSERT
2932 if (should_inject_error) {
2933 log_develop_debug(pagesize)("Reserving pages individually failed.");
2934 }
2935 #endif
2936 return NULL;
2937 }
2938
2939 bytes_remaining -= bytes_to_rq;
2940 next_alloc_addr += bytes_to_rq;
2941 count++;
2942 }
2943 // Although the memory is allocated individually, it is returned as one.
2944 // NMT records it as one block.
2945 if ((flags & MEM_COMMIT) != 0) {
2946 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2947 } else {
2948 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2949 }
2950
2951 // made it this far, success
2952 return p_buf;
2953 }
2954
2955
2956
2957 void os::large_page_init() {
2958 if (!UseLargePages) return;
2959
2960 // print a warning if any large page related flag is specified on command line
2961 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2962 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2963 bool success = false;
2964
2965 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2966 if (request_lock_memory_privilege()) {
2967 size_t s = GetLargePageMinimum();
2968 if (s) {
2969 #if defined(IA32) || defined(AMD64)
2970 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2971 WARN("JVM cannot use large pages bigger than 4mb.");
2972 } else {
2973 #endif
2974 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2975 _large_page_size = LargePageSizeInBytes;
2976 } else {
2977 _large_page_size = s;
2978 }
2979 success = true;
2980 #if defined(IA32) || defined(AMD64)
2981 }
2982 #endif
2983 } else {
2984 WARN("Large page is not supported by the processor.");
2985 }
2986 } else {
2987 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2988 }
2989 #undef WARN
2990
2991 const size_t default_page_size = (size_t) vm_page_size();
2992 if (success && _large_page_size > default_page_size) {
2993 _page_sizes[0] = _large_page_size;
2994 _page_sizes[1] = default_page_size;
2995 _page_sizes[2] = 0;
2996 }
2997
2998 cleanup_after_large_page_init();
2999 UseLargePages = success;
3000 }
3001
3002 int os::create_file_for_heap(const char* dir) {
3003
3004 const char name_template[] = "/jvmheap.XXXXXX";
3005
3006 size_t fullname_len = strlen(dir) + strlen(name_template);
3007 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3008 if (fullname == NULL) {
3009 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3010 return -1;
3011 }
3012 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3013 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3014
3015 os::native_path(fullname);
3016
3017 char *path = _mktemp(fullname);
3018 if (path == NULL) {
3019 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3020 os::free(fullname);
3021 return -1;
3022 }
3023
3024 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3025
3026 os::free(fullname);
3027 if (fd < 0) {
3028 warning("Problem opening file for heap (%s)", os::strerror(errno));
3029 return -1;
3030 }
3031 return fd;
3032 }
3033
3034 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3035 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3036 assert(fd != -1, "File descriptor is not valid");
3037
3038 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3039 #ifdef _LP64
3040 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3041 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3042 #else
3043 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3044 0, (DWORD)size, NULL);
3045 #endif
3046 if (fileMapping == NULL) {
3047 if (GetLastError() == ERROR_DISK_FULL) {
3048 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3049 }
3050 else {
3051 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3052 }
3053
3054 return NULL;
3055 }
3056
3057 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3058
3059 CloseHandle(fileMapping);
3060
3061 return (char*)addr;
3062 }
3063
3064 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3065 assert(fd != -1, "File descriptor is not valid");
3066 assert(base != NULL, "Base address cannot be NULL");
3067
3068 release_memory(base, size);
3069 return map_memory_to_file(base, size, fd);
3070 }
3071
3072 // On win32, one cannot release just a part of reserved memory, it's an
3073 // all or nothing deal. When we split a reservation, we must break the
3074 // reservation into two reservations.
3075 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3076 bool realloc) {
3077 if (size > 0) {
3078 release_memory(base, size);
3079 if (realloc) {
3080 reserve_memory(split, base);
3081 }
3082 if (size != split) {
3083 reserve_memory(size - split, base + split);
3084 }
3085 }
3086 }
3087
3088 // Multiple threads can race in this code but it's not possible to unmap small sections of
3089 // virtual space to get requested alignment, like posix-like os's.
3090 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3091 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3092 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3093 "Alignment must be a multiple of allocation granularity (page size)");
3094 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3095
3096 size_t extra_size = size + alignment;
3097 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3098
3099 char* aligned_base = NULL;
3100
3101 do {
3102 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3103 if (extra_base == NULL) {
3104 return NULL;
3105 }
3106 // Do manual alignment
3107 aligned_base = align_up(extra_base, alignment);
3108
3109 if (file_desc != -1) {
3110 os::unmap_memory(extra_base, extra_size);
3111 } else {
3112 os::release_memory(extra_base, extra_size);
3113 }
3114
3115 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3116
3117 } while (aligned_base == NULL);
3118
3119 return aligned_base;
3120 }
3121
3122 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3123 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3124 "reserve alignment");
3125 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3126 char* res;
3127 // note that if UseLargePages is on, all the areas that require interleaving
3128 // will go thru reserve_memory_special rather than thru here.
3129 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3130 if (!use_individual) {
3131 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3132 } else {
3133 elapsedTimer reserveTimer;
3134 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3135 // in numa interleaving, we have to allocate pages individually
3136 // (well really chunks of NUMAInterleaveGranularity size)
3137 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3138 if (res == NULL) {
3139 warning("NUMA page allocation failed");
3140 }
3141 if (Verbose && PrintMiscellaneous) {
3142 reserveTimer.stop();
3143 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3144 reserveTimer.milliseconds(), reserveTimer.ticks());
3145 }
3146 }
3147 assert(res == NULL || addr == NULL || addr == res,
3148 "Unexpected address from reserve.");
3149
3150 return res;
3151 }
3152
3153 // Reserve memory at an arbitrary address, only if that area is
3154 // available (and not reserved for something else).
3155 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3156 // Windows os::reserve_memory() fails of the requested address range is
3157 // not avilable.
3158 return reserve_memory(bytes, requested_addr);
3159 }
3160
3161 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3162 assert(file_desc >= 0, "file_desc is not valid");
3163 return map_memory_to_file(requested_addr, bytes, file_desc);
3164 }
3165
3166 size_t os::large_page_size() {
3167 return _large_page_size;
3168 }
3169
3170 bool os::can_commit_large_page_memory() {
3171 // Windows only uses large page memory when the entire region is reserved
3172 // and committed in a single VirtualAlloc() call. This may change in the
3173 // future, but with Windows 2003 it's not possible to commit on demand.
3174 return false;
3175 }
3176
3177 bool os::can_execute_large_page_memory() {
3178 return true;
3179 }
3180
3181 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3182 bool exec) {
3183 assert(UseLargePages, "only for large pages");
3184
3185 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3186 return NULL; // Fallback to small pages.
3187 }
3188
3189 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3190 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3191
3192 // with large pages, there are two cases where we need to use Individual Allocation
3193 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3194 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3195 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3196 log_debug(pagesize)("Reserving large pages individually.");
3197
3198 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3199 if (p_buf == NULL) {
3200 // give an appropriate warning message
3201 if (UseNUMAInterleaving) {
3202 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3203 }
3204 if (UseLargePagesIndividualAllocation) {
3205 warning("Individually allocated large pages failed, "
3206 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3207 }
3208 return NULL;
3209 }
3210
3211 return p_buf;
3212
3213 } else {
3214 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3215
3216 // normal policy just allocate it all at once
3217 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3218 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3219 if (res != NULL) {
3220 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3221 }
3222
3223 return res;
3224 }
3225 }
3226
3227 bool os::release_memory_special(char* base, size_t bytes) {
3228 assert(base != NULL, "Sanity check");
3229 return release_memory(base, bytes);
3230 }
3231
3232 void os::print_statistics() {
3233 }
3234
3235 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3236 int err = os::get_last_error();
3237 char buf[256];
3238 size_t buf_len = os::lasterror(buf, sizeof(buf));
3239 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3240 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3241 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3242 }
3243
3244 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3245 if (bytes == 0) {
3246 // Don't bother the OS with noops.
3247 return true;
3248 }
3249 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3250 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3251 // Don't attempt to print anything if the OS call fails. We're
3252 // probably low on resources, so the print itself may cause crashes.
3253
3254 // unless we have NUMAInterleaving enabled, the range of a commit
3255 // is always within a reserve covered by a single VirtualAlloc
3256 // in that case we can just do a single commit for the requested size
3257 if (!UseNUMAInterleaving) {
3258 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3259 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3260 return false;
3261 }
3262 if (exec) {
3263 DWORD oldprot;
3264 // Windows doc says to use VirtualProtect to get execute permissions
3265 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3266 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3267 return false;
3268 }
3269 }
3270 return true;
3271 } else {
3272
3273 // when NUMAInterleaving is enabled, the commit might cover a range that
3274 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3275 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3276 // returns represents the number of bytes that can be committed in one step.
3277 size_t bytes_remaining = bytes;
3278 char * next_alloc_addr = addr;
3279 while (bytes_remaining > 0) {
3280 MEMORY_BASIC_INFORMATION alloc_info;
3281 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3282 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3283 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3284 PAGE_READWRITE) == NULL) {
3285 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3286 exec);)
3287 return false;
3288 }
3289 if (exec) {
3290 DWORD oldprot;
3291 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3292 PAGE_EXECUTE_READWRITE, &oldprot)) {
3293 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3294 exec);)
3295 return false;
3296 }
3297 }
3298 bytes_remaining -= bytes_to_rq;
3299 next_alloc_addr += bytes_to_rq;
3300 }
3301 }
3302 // if we made it this far, return true
3303 return true;
3304 }
3305
3306 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3307 bool exec) {
3308 // alignment_hint is ignored on this OS
3309 return pd_commit_memory(addr, size, exec);
3310 }
3311
3312 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3313 const char* mesg) {
3314 assert(mesg != NULL, "mesg must be specified");
3315 if (!pd_commit_memory(addr, size, exec)) {
3316 warn_fail_commit_memory(addr, size, exec);
3317 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3318 }
3319 }
3320
3321 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3322 size_t alignment_hint, bool exec,
3323 const char* mesg) {
3324 // alignment_hint is ignored on this OS
3325 pd_commit_memory_or_exit(addr, size, exec, mesg);
3326 }
3327
3328 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3329 if (bytes == 0) {
3330 // Don't bother the OS with noops.
3331 return true;
3332 }
3333 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3334 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3335 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3336 }
3337
3338 bool os::pd_release_memory(char* addr, size_t bytes) {
3339 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3340 }
3341
3342 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3343 return os::commit_memory(addr, size, !ExecMem);
3344 }
3345
3346 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3347 return os::uncommit_memory(addr, size);
3348 }
3349
3350 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3351 uint count = 0;
3352 bool ret = false;
3353 size_t bytes_remaining = bytes;
3354 char * next_protect_addr = addr;
3355
3356 // Use VirtualQuery() to get the chunk size.
3357 while (bytes_remaining) {
3358 MEMORY_BASIC_INFORMATION alloc_info;
3359 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3360 return false;
3361 }
3362
3363 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3364 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3365 // but we don't distinguish here as both cases are protected by same API.
3366 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3367 warning("Failed protecting pages individually for chunk #%u", count);
3368 if (!ret) {
3369 return false;
3370 }
3371
3372 bytes_remaining -= bytes_to_protect;
3373 next_protect_addr += bytes_to_protect;
3374 count++;
3375 }
3376 return ret;
3377 }
3378
3379 // Set protections specified
3380 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3381 bool is_committed) {
3382 unsigned int p = 0;
3383 switch (prot) {
3384 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3385 case MEM_PROT_READ: p = PAGE_READONLY; break;
3386 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3387 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3388 default:
3389 ShouldNotReachHere();
3390 }
3391
3392 DWORD old_status;
3393
3394 // Strange enough, but on Win32 one can change protection only for committed
3395 // memory, not a big deal anyway, as bytes less or equal than 64K
3396 if (!is_committed) {
3397 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3398 "cannot commit protection page");
3399 }
3400 // One cannot use os::guard_memory() here, as on Win32 guard page
3401 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3402 //
3403 // Pages in the region become guard pages. Any attempt to access a guard page
3404 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3405 // the guard page status. Guard pages thus act as a one-time access alarm.
3406 bool ret;
3407 if (UseNUMAInterleaving) {
3408 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3409 // so we must protect the chunks individually.
3410 ret = protect_pages_individually(addr, bytes, p, &old_status);
3411 } else {
3412 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3413 }
3414 #ifdef ASSERT
3415 if (!ret) {
3416 int err = os::get_last_error();
3417 char buf[256];
3418 size_t buf_len = os::lasterror(buf, sizeof(buf));
3419 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3420 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3421 buf_len != 0 ? buf : "<no_error_string>", err);
3422 }
3423 #endif
3424 return ret;
3425 }
3426
3427 bool os::guard_memory(char* addr, size_t bytes) {
3428 DWORD old_status;
3429 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3430 }
3431
3432 bool os::unguard_memory(char* addr, size_t bytes) {
3433 DWORD old_status;
3434 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3435 }
3436
3437 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3438 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3439 void os::numa_make_global(char *addr, size_t bytes) { }
3440 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3441 bool os::numa_topology_changed() { return false; }
3442 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3443 int os::numa_get_group_id() { return 0; }
3444 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3445 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3446 // Provide an answer for UMA systems
3447 ids[0] = 0;
3448 return 1;
3449 } else {
3450 // check for size bigger than actual groups_num
3451 size = MIN2(size, numa_get_groups_num());
3452 for (int i = 0; i < (int)size; i++) {
3453 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3454 }
3455 return size;
3456 }
3457 }
3458
3459 bool os::get_page_info(char *start, page_info* info) {
3460 return false;
3461 }
3462
3463 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3464 page_info* page_found) {
3465 return end;
3466 }
3467
3468 char* os::non_memory_address_word() {
3469 // Must never look like an address returned by reserve_memory,
3470 // even in its subfields (as defined by the CPU immediate fields,
3471 // if the CPU splits constants across multiple instructions).
3472 return (char*)-1;
3473 }
3474
3475 #define MAX_ERROR_COUNT 100
3476 #define SYS_THREAD_ERROR 0xffffffffUL
3477
3478 void os::pd_start_thread(Thread* thread) {
3479 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3480 // Returns previous suspend state:
3481 // 0: Thread was not suspended
3482 // 1: Thread is running now
3483 // >1: Thread is still suspended.
3484 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3485 }
3486
3487
3488 // Short sleep, direct OS call.
3489 //
3490 // ms = 0, means allow others (if any) to run.
3491 //
3492 void os::naked_short_sleep(jlong ms) {
3493 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3494 Sleep(ms);
3495 }
3496
3497 // Windows does not provide sleep functionality with nanosecond resolution, so we
3498 // try to approximate this with spinning combined with yielding if another thread
3499 // is ready to run on the current processor.
3500 void os::naked_short_nanosleep(jlong ns) {
3501 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3502
3503 int64_t start = os::javaTimeNanos();
3504 do {
3505 if (SwitchToThread() == 0) {
3506 // Nothing else is ready to run on this cpu, spin a little
3507 SpinPause();
3508 }
3509 } while (os::javaTimeNanos() - start < ns);
3510 }
3511
3512 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3513 void os::infinite_sleep() {
3514 while (true) { // sleep forever ...
3515 Sleep(100000); // ... 100 seconds at a time
3516 }
3517 }
3518
3519 typedef BOOL (WINAPI * STTSignature)(void);
3520
3521 void os::naked_yield() {
3522 // Consider passing back the return value from SwitchToThread().
3523 SwitchToThread();
3524 }
3525
3526 // Win32 only gives you access to seven real priorities at a time,
3527 // so we compress Java's ten down to seven. It would be better
3528 // if we dynamically adjusted relative priorities.
3529
3530 int os::java_to_os_priority[CriticalPriority + 1] = {
3531 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3532 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3533 THREAD_PRIORITY_LOWEST, // 2
3534 THREAD_PRIORITY_BELOW_NORMAL, // 3
3535 THREAD_PRIORITY_BELOW_NORMAL, // 4
3536 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3537 THREAD_PRIORITY_NORMAL, // 6
3538 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3540 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3541 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3542 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3543 };
3544
3545 int prio_policy1[CriticalPriority + 1] = {
3546 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3547 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3548 THREAD_PRIORITY_LOWEST, // 2
3549 THREAD_PRIORITY_BELOW_NORMAL, // 3
3550 THREAD_PRIORITY_BELOW_NORMAL, // 4
3551 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3552 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3553 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3554 THREAD_PRIORITY_HIGHEST, // 8
3555 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3556 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3557 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3558 };
3559
3560 static int prio_init() {
3561 // If ThreadPriorityPolicy is 1, switch tables
3562 if (ThreadPriorityPolicy == 1) {
3563 int i;
3564 for (i = 0; i < CriticalPriority + 1; i++) {
3565 os::java_to_os_priority[i] = prio_policy1[i];
3566 }
3567 }
3568 if (UseCriticalJavaThreadPriority) {
3569 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3570 }
3571 return 0;
3572 }
3573
3574 OSReturn os::set_native_priority(Thread* thread, int priority) {
3575 if (!UseThreadPriorities) return OS_OK;
3576 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3577 return ret ? OS_OK : OS_ERR;
3578 }
3579
3580 OSReturn os::get_native_priority(const Thread* const thread,
3581 int* priority_ptr) {
3582 if (!UseThreadPriorities) {
3583 *priority_ptr = java_to_os_priority[NormPriority];
3584 return OS_OK;
3585 }
3586 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3587 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3588 assert(false, "GetThreadPriority failed");
3589 return OS_ERR;
3590 }
3591 *priority_ptr = os_prio;
3592 return OS_OK;
3593 }
3594
3595 // GetCurrentThreadId() returns DWORD
3596 intx os::current_thread_id() { return GetCurrentThreadId(); }
3597
3598 static int _initial_pid = 0;
3599
3600 int os::current_process_id() {
3601 return (_initial_pid ? _initial_pid : _getpid());
3602 }
3603
3604 int os::win32::_vm_page_size = 0;
3605 int os::win32::_vm_allocation_granularity = 0;
3606 int os::win32::_processor_type = 0;
3607 // Processor level is not available on non-NT systems, use vm_version instead
3608 int os::win32::_processor_level = 0;
3609 julong os::win32::_physical_memory = 0;
3610 size_t os::win32::_default_stack_size = 0;
3611
3612 intx os::win32::_os_thread_limit = 0;
3613 volatile intx os::win32::_os_thread_count = 0;
3614
3615 bool os::win32::_is_windows_server = false;
3616
3617 // 6573254
3618 // Currently, the bug is observed across all the supported Windows releases,
3619 // including the latest one (as of this writing - Windows Server 2012 R2)
3620 bool os::win32::_has_exit_bug = true;
3621
3622 void os::win32::initialize_system_info() {
3623 SYSTEM_INFO si;
3624 GetSystemInfo(&si);
3625 _vm_page_size = si.dwPageSize;
3626 _vm_allocation_granularity = si.dwAllocationGranularity;
3627 _processor_type = si.dwProcessorType;
3628 _processor_level = si.wProcessorLevel;
3629 set_processor_count(si.dwNumberOfProcessors);
3630
3631 MEMORYSTATUSEX ms;
3632 ms.dwLength = sizeof(ms);
3633
3634 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3635 // dwMemoryLoad (% of memory in use)
3636 GlobalMemoryStatusEx(&ms);
3637 _physical_memory = ms.ullTotalPhys;
3638
3639 if (FLAG_IS_DEFAULT(MaxRAM)) {
3640 // Adjust MaxRAM according to the maximum virtual address space available.
3641 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3642 }
3643
3644 OSVERSIONINFOEX oi;
3645 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3646 GetVersionEx((OSVERSIONINFO*)&oi);
3647 switch (oi.dwPlatformId) {
3648 case VER_PLATFORM_WIN32_NT:
3649 {
3650 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3651 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3652 oi.wProductType == VER_NT_SERVER) {
3653 _is_windows_server = true;
3654 }
3655 }
3656 break;
3657 default: fatal("Unknown platform");
3658 }
3659
3660 _default_stack_size = os::current_stack_size();
3661 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3662 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3663 "stack size not a multiple of page size");
3664
3665 initialize_performance_counter();
3666 }
3667
3668
3669 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3670 int ebuflen) {
3671 char path[MAX_PATH];
3672 DWORD size;
3673 DWORD pathLen = (DWORD)sizeof(path);
3674 HINSTANCE result = NULL;
3675
3676 // only allow library name without path component
3677 assert(strchr(name, '\\') == NULL, "path not allowed");
3678 assert(strchr(name, ':') == NULL, "path not allowed");
3679 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3680 jio_snprintf(ebuf, ebuflen,
3681 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3682 return NULL;
3683 }
3684
3685 // search system directory
3686 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3687 if (size >= pathLen) {
3688 return NULL; // truncated
3689 }
3690 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3691 return NULL; // truncated
3692 }
3693 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3694 return result;
3695 }
3696 }
3697
3698 // try Windows directory
3699 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3700 if (size >= pathLen) {
3701 return NULL; // truncated
3702 }
3703 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3704 return NULL; // truncated
3705 }
3706 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3707 return result;
3708 }
3709 }
3710
3711 jio_snprintf(ebuf, ebuflen,
3712 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3713 return NULL;
3714 }
3715
3716 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3717 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3718
3719 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3720 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3721 return TRUE;
3722 }
3723
3724 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3725 // Basic approach:
3726 // - Each exiting thread registers its intent to exit and then does so.
3727 // - A thread trying to terminate the process must wait for all
3728 // threads currently exiting to complete their exit.
3729
3730 if (os::win32::has_exit_bug()) {
3731 // The array holds handles of the threads that have started exiting by calling
3732 // _endthreadex().
3733 // Should be large enough to avoid blocking the exiting thread due to lack of
3734 // a free slot.
3735 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3736 static int handle_count = 0;
3737
3738 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3739 static CRITICAL_SECTION crit_sect;
3740 static volatile DWORD process_exiting = 0;
3741 int i, j;
3742 DWORD res;
3743 HANDLE hproc, hthr;
3744
3745 // We only attempt to register threads until a process exiting
3746 // thread manages to set the process_exiting flag. Any threads
3747 // that come through here after the process_exiting flag is set
3748 // are unregistered and will be caught in the SuspendThread()
3749 // infinite loop below.
3750 bool registered = false;
3751
3752 // The first thread that reached this point, initializes the critical section.
3753 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3754 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3755 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3756 if (what != EPT_THREAD) {
3757 // Atomically set process_exiting before the critical section
3758 // to increase the visibility between racing threads.
3759 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3760 }
3761 EnterCriticalSection(&crit_sect);
3762
3763 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3764 // Remove from the array those handles of the threads that have completed exiting.
3765 for (i = 0, j = 0; i < handle_count; ++i) {
3766 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3767 if (res == WAIT_TIMEOUT) {
3768 handles[j++] = handles[i];
3769 } else {
3770 if (res == WAIT_FAILED) {
3771 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3772 GetLastError(), __FILE__, __LINE__);
3773 }
3774 // Don't keep the handle, if we failed waiting for it.
3775 CloseHandle(handles[i]);
3776 }
3777 }
3778
3779 // If there's no free slot in the array of the kept handles, we'll have to
3780 // wait until at least one thread completes exiting.
3781 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3782 // Raise the priority of the oldest exiting thread to increase its chances
3783 // to complete sooner.
3784 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3785 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3786 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3787 i = (res - WAIT_OBJECT_0);
3788 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3789 for (; i < handle_count; ++i) {
3790 handles[i] = handles[i + 1];
3791 }
3792 } else {
3793 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3794 (res == WAIT_FAILED ? "failed" : "timed out"),
3795 GetLastError(), __FILE__, __LINE__);
3796 // Don't keep handles, if we failed waiting for them.
3797 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3798 CloseHandle(handles[i]);
3799 }
3800 handle_count = 0;
3801 }
3802 }
3803
3804 // Store a duplicate of the current thread handle in the array of handles.
3805 hproc = GetCurrentProcess();
3806 hthr = GetCurrentThread();
3807 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3808 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3809 warning("DuplicateHandle failed (%u) in %s: %d\n",
3810 GetLastError(), __FILE__, __LINE__);
3811
3812 // We can't register this thread (no more handles) so this thread
3813 // may be racing with a thread that is calling exit(). If the thread
3814 // that is calling exit() has managed to set the process_exiting
3815 // flag, then this thread will be caught in the SuspendThread()
3816 // infinite loop below which closes that race. A small timing
3817 // window remains before the process_exiting flag is set, but it
3818 // is only exposed when we are out of handles.
3819 } else {
3820 ++handle_count;
3821 registered = true;
3822
3823 // The current exiting thread has stored its handle in the array, and now
3824 // should leave the critical section before calling _endthreadex().
3825 }
3826
3827 } else if (what != EPT_THREAD && handle_count > 0) {
3828 jlong start_time, finish_time, timeout_left;
3829 // Before ending the process, make sure all the threads that had called
3830 // _endthreadex() completed.
3831
3832 // Set the priority level of the current thread to the same value as
3833 // the priority level of exiting threads.
3834 // This is to ensure it will be given a fair chance to execute if
3835 // the timeout expires.
3836 hthr = GetCurrentThread();
3837 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3838 start_time = os::javaTimeNanos();
3839 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3840 for (i = 0; ; ) {
3841 int portion_count = handle_count - i;
3842 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3843 portion_count = MAXIMUM_WAIT_OBJECTS;
3844 }
3845 for (j = 0; j < portion_count; ++j) {
3846 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3847 }
3848 timeout_left = (finish_time - start_time) / 1000000L;
3849 if (timeout_left < 0) {
3850 timeout_left = 0;
3851 }
3852 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3853 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3854 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3855 (res == WAIT_FAILED ? "failed" : "timed out"),
3856 GetLastError(), __FILE__, __LINE__);
3857 // Reset portion_count so we close the remaining
3858 // handles due to this error.
3859 portion_count = handle_count - i;
3860 }
3861 for (j = 0; j < portion_count; ++j) {
3862 CloseHandle(handles[i + j]);
3863 }
3864 if ((i += portion_count) >= handle_count) {
3865 break;
3866 }
3867 start_time = os::javaTimeNanos();
3868 }
3869 handle_count = 0;
3870 }
3871
3872 LeaveCriticalSection(&crit_sect);
3873 }
3874
3875 if (!registered &&
3876 OrderAccess::load_acquire(&process_exiting) != 0 &&
3877 process_exiting != GetCurrentThreadId()) {
3878 // Some other thread is about to call exit(), so we don't let
3879 // the current unregistered thread proceed to exit() or _endthreadex()
3880 while (true) {
3881 SuspendThread(GetCurrentThread());
3882 // Avoid busy-wait loop, if SuspendThread() failed.
3883 Sleep(EXIT_TIMEOUT);
3884 }
3885 }
3886 }
3887
3888 // We are here if either
3889 // - there's no 'race at exit' bug on this OS release;
3890 // - initialization of the critical section failed (unlikely);
3891 // - the current thread has registered itself and left the critical section;
3892 // - the process-exiting thread has raised the flag and left the critical section.
3893 if (what == EPT_THREAD) {
3894 _endthreadex((unsigned)exit_code);
3895 } else if (what == EPT_PROCESS) {
3896 ::exit(exit_code);
3897 } else {
3898 _exit(exit_code);
3899 }
3900
3901 // Should not reach here
3902 return exit_code;
3903 }
3904
3905 #undef EXIT_TIMEOUT
3906
3907 void os::win32::setmode_streams() {
3908 _setmode(_fileno(stdin), _O_BINARY);
3909 _setmode(_fileno(stdout), _O_BINARY);
3910 _setmode(_fileno(stderr), _O_BINARY);
3911 }
3912
3913
3914 bool os::is_debugger_attached() {
3915 return IsDebuggerPresent() ? true : false;
3916 }
3917
3918
3919 void os::wait_for_keypress_at_exit(void) {
3920 if (PauseAtExit) {
3921 fprintf(stderr, "Press any key to continue...\n");
3922 fgetc(stdin);
3923 }
3924 }
3925
3926
3927 bool os::message_box(const char* title, const char* message) {
3928 int result = MessageBox(NULL, message, title,
3929 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3930 return result == IDYES;
3931 }
3932
3933 #ifndef PRODUCT
3934 #ifndef _WIN64
3935 // Helpers to check whether NX protection is enabled
3936 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3937 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3938 pex->ExceptionRecord->NumberParameters > 0 &&
3939 pex->ExceptionRecord->ExceptionInformation[0] ==
3940 EXCEPTION_INFO_EXEC_VIOLATION) {
3941 return EXCEPTION_EXECUTE_HANDLER;
3942 }
3943 return EXCEPTION_CONTINUE_SEARCH;
3944 }
3945
3946 void nx_check_protection() {
3947 // If NX is enabled we'll get an exception calling into code on the stack
3948 char code[] = { (char)0xC3 }; // ret
3949 void *code_ptr = (void *)code;
3950 __try {
3951 __asm call code_ptr
3952 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3953 tty->print_raw_cr("NX protection detected.");
3954 }
3955 }
3956 #endif // _WIN64
3957 #endif // PRODUCT
3958
3959 // This is called _before_ the global arguments have been parsed
3960 void os::init(void) {
3961 _initial_pid = _getpid();
3962
3963 init_random(1234567);
3964
3965 win32::initialize_system_info();
3966 win32::setmode_streams();
3967 init_page_sizes((size_t) win32::vm_page_size());
3968
3969 // This may be overridden later when argument processing is done.
3970 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
3971
3972 // Initialize main_process and main_thread
3973 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3974 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3975 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3976 fatal("DuplicateHandle failed\n");
3977 }
3978 main_thread_id = (int) GetCurrentThreadId();
3979
3980 // initialize fast thread access - only used for 32-bit
3981 win32::initialize_thread_ptr_offset();
3982 }
3983
3984 // To install functions for atexit processing
3985 extern "C" {
3986 static void perfMemory_exit_helper() {
3987 perfMemory_exit();
3988 }
3989 }
3990
3991 static jint initSock();
3992
3993 // this is called _after_ the global arguments have been parsed
3994 jint os::init_2(void) {
3995
3996 // This could be set any time but all platforms
3997 // have to set it the same so we have to mirror Solaris.
3998 DEBUG_ONLY(os::set_mutex_init_done();)
3999
4000 // Setup Windows Exceptions
4001
4002 #if INCLUDE_AOT
4003 // If AOT is enabled we need to install a vectored exception handler
4004 // in order to forward implicit exceptions from code in AOT
4005 // generated DLLs. This is necessary since these DLLs are not
4006 // registered for structured exceptions like codecache methods are.
4007 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4008 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4009 }
4010 #endif
4011
4012 // for debugging float code generation bugs
4013 if (ForceFloatExceptions) {
4014 #ifndef _WIN64
4015 static long fp_control_word = 0;
4016 __asm { fstcw fp_control_word }
4017 // see Intel PPro Manual, Vol. 2, p 7-16
4018 const long precision = 0x20;
4019 const long underflow = 0x10;
4020 const long overflow = 0x08;
4021 const long zero_div = 0x04;
4022 const long denorm = 0x02;
4023 const long invalid = 0x01;
4024 fp_control_word |= invalid;
4025 __asm { fldcw fp_control_word }
4026 #endif
4027 }
4028
4029 // If stack_commit_size is 0, windows will reserve the default size,
4030 // but only commit a small portion of it.
4031 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4032 size_t default_reserve_size = os::win32::default_stack_size();
4033 size_t actual_reserve_size = stack_commit_size;
4034 if (stack_commit_size < default_reserve_size) {
4035 // If stack_commit_size == 0, we want this too
4036 actual_reserve_size = default_reserve_size;
4037 }
4038
4039 // Check minimum allowable stack size for thread creation and to initialize
4040 // the java system classes, including StackOverflowError - depends on page
4041 // size. Add two 4K pages for compiler2 recursion in main thread.
4042 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4043 // class initialization depending on 32 or 64 bit VM.
4044 size_t min_stack_allowed =
4045 (size_t)(JavaThread::stack_guard_zone_size() +
4046 JavaThread::stack_shadow_zone_size() +
4047 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4048
4049 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4050
4051 if (actual_reserve_size < min_stack_allowed) {
4052 tty->print_cr("\nThe Java thread stack size specified is too small. "
4053 "Specify at least %dk",
4054 min_stack_allowed / K);
4055 return JNI_ERR;
4056 }
4057
4058 JavaThread::set_stack_size_at_create(stack_commit_size);
4059
4060 // Calculate theoretical max. size of Threads to guard gainst artifical
4061 // out-of-memory situations, where all available address-space has been
4062 // reserved by thread stacks.
4063 assert(actual_reserve_size != 0, "Must have a stack");
4064
4065 // Calculate the thread limit when we should start doing Virtual Memory
4066 // banging. Currently when the threads will have used all but 200Mb of space.
4067 //
4068 // TODO: consider performing a similar calculation for commit size instead
4069 // as reserve size, since on a 64-bit platform we'll run into that more
4070 // often than running out of virtual memory space. We can use the
4071 // lower value of the two calculations as the os_thread_limit.
4072 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4073 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4074
4075 // at exit methods are called in the reverse order of their registration.
4076 // there is no limit to the number of functions registered. atexit does
4077 // not set errno.
4078
4079 if (PerfAllowAtExitRegistration) {
4080 // only register atexit functions if PerfAllowAtExitRegistration is set.
4081 // atexit functions can be delayed until process exit time, which
4082 // can be problematic for embedded VM situations. Embedded VMs should
4083 // call DestroyJavaVM() to assure that VM resources are released.
4084
4085 // note: perfMemory_exit_helper atexit function may be removed in
4086 // the future if the appropriate cleanup code can be added to the
4087 // VM_Exit VMOperation's doit method.
4088 if (atexit(perfMemory_exit_helper) != 0) {
4089 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4090 }
4091 }
4092
4093 #ifndef _WIN64
4094 // Print something if NX is enabled (win32 on AMD64)
4095 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4096 #endif
4097
4098 // initialize thread priority policy
4099 prio_init();
4100
4101 if (UseNUMA && !ForceNUMA) {
4102 UseNUMA = false; // We don't fully support this yet
4103 }
4104
4105 if (UseNUMAInterleaving) {
4106 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4107 bool success = numa_interleaving_init();
4108 if (!success) UseNUMAInterleaving = false;
4109 }
4110
4111 if (initSock() != JNI_OK) {
4112 return JNI_ERR;
4113 }
4114
4115 SymbolEngine::recalc_search_path();
4116
4117 // Initialize data for jdk.internal.misc.Signal
4118 if (!ReduceSignalUsage) {
4119 jdk_misc_signal_init();
4120 }
4121
4122 return JNI_OK;
4123 }
4124
4125 // Mark the polling page as unreadable
4126 void os::make_polling_page_unreadable(void) {
4127 DWORD old_status;
4128 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4129 PAGE_NOACCESS, &old_status)) {
4130 fatal("Could not disable polling page");
4131 }
4132 }
4133
4134 // Mark the polling page as readable
4135 void os::make_polling_page_readable(void) {
4136 DWORD old_status;
4137 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4138 PAGE_READONLY, &old_status)) {
4139 fatal("Could not enable polling page");
4140 }
4141 }
4142
4143 // combine the high and low DWORD into a ULONGLONG
4144 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4145 ULONGLONG value = high_word;
4146 value <<= sizeof(high_word) * 8;
4147 value |= low_word;
4148 return value;
4149 }
4150
4151 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4152 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4153 ::memset((void*)sbuf, 0, sizeof(struct stat));
4154 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4155 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4156 file_data.ftLastWriteTime.dwLowDateTime);
4157 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4158 file_data.ftCreationTime.dwLowDateTime);
4159 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4160 file_data.ftLastAccessTime.dwLowDateTime);
4161 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4162 sbuf->st_mode |= S_IFDIR;
4163 } else {
4164 sbuf->st_mode |= S_IFREG;
4165 }
4166 }
4167
4168 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c
4169 // Creates an UNC path from a single byte path. Return buffer is
4170 // allocated in C heap and needs to be freed by the caller.
4171 // Returns NULL on error.
4172 static wchar_t* create_unc_path(const char* path, errno_t &err) {
4173 wchar_t* wpath = NULL;
4174 size_t converted_chars = 0;
4175 size_t path_len = strlen(path) + 1; // includes the terminating NULL
4176 if (path[0] == '\\' && path[1] == '\\') {
4177 if (path[2] == '?' && path[3] == '\\'){
4178 // if it already has a \\?\ don't do the prefix
4179 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal);
4180 if (wpath != NULL) {
4181 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len);
4182 } else {
4183 err = ENOMEM;
4184 }
4185 } else {
4186 // only UNC pathname includes double slashes here
4187 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal);
4188 if (wpath != NULL) {
4189 ::wcscpy(wpath, L"\\\\?\\UNC\0");
4190 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len);
4191 } else {
4192 err = ENOMEM;
4193 }
4194 }
4195 } else {
4196 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal);
4197 if (wpath != NULL) {
4198 ::wcscpy(wpath, L"\\\\?\\\0");
4199 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len);
4200 } else {
4201 err = ENOMEM;
4202 }
4203 }
4204 return wpath;
4205 }
4206
4207 static void destroy_unc_path(wchar_t* wpath) {
4208 os::free(wpath);
4209 }
4210
4211 int os::stat(const char *path, struct stat *sbuf) {
4212 char* pathbuf = (char*)os::strdup(path, mtInternal);
4213 if (pathbuf == NULL) {
4214 errno = ENOMEM;
4215 return -1;
4216 }
4217 os::native_path(pathbuf);
4218 int ret;
4219 WIN32_FILE_ATTRIBUTE_DATA file_data;
4220 // Not using stat() to avoid the problem described in JDK-6539723
4221 if (strlen(path) < MAX_PATH) {
4222 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data);
4223 if (!bret) {
4224 errno = ::GetLastError();
4225 ret = -1;
4226 }
4227 else {
4228 file_attribute_data_to_stat(sbuf, file_data);
4229 ret = 0;
4230 }
4231 } else {
4232 errno_t err = ERROR_SUCCESS;
4233 wchar_t* wpath = create_unc_path(pathbuf, err);
4234 if (err != ERROR_SUCCESS) {
4235 if (wpath != NULL) {
4236 destroy_unc_path(wpath);
4237 }
4238 os::free(pathbuf);
4239 errno = err;
4240 return -1;
4241 }
4242 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data);
4243 if (!bret) {
4244 errno = ::GetLastError();
4245 ret = -1;
4246 } else {
4247 file_attribute_data_to_stat(sbuf, file_data);
4248 ret = 0;
4249 }
4250 destroy_unc_path(wpath);
4251 }
4252 os::free(pathbuf);
4253 return ret;
4254 }
4255
4256 static HANDLE create_read_only_file_handle(const char* file) {
4257 if (file == NULL) {
4258 return INVALID_HANDLE_VALUE;
4259 }
4260
4261 char* nativepath = (char*)os::strdup(file, mtInternal);
4262 if (nativepath == NULL) {
4263 errno = ENOMEM;
4264 return INVALID_HANDLE_VALUE;
4265 }
4266 os::native_path(nativepath);
4267
4268 size_t len = strlen(nativepath);
4269 HANDLE handle = INVALID_HANDLE_VALUE;
4270
4271 if (len < MAX_PATH) {
4272 handle = ::CreateFile(nativepath, 0, FILE_SHARE_READ,
4273 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4274 } else {
4275 errno_t err = ERROR_SUCCESS;
4276 wchar_t* wfile = create_unc_path(nativepath, err);
4277 if (err != ERROR_SUCCESS) {
4278 if (wfile != NULL) {
4279 destroy_unc_path(wfile);
4280 }
4281 os::free(nativepath);
4282 return INVALID_HANDLE_VALUE;
4283 }
4284 handle = ::CreateFileW(wfile, 0, FILE_SHARE_READ,
4285 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4286 destroy_unc_path(wfile);
4287 }
4288
4289 os::free(nativepath);
4290 return handle;
4291 }
4292
4293 bool os::same_files(const char* file1, const char* file2) {
4294
4295 if (file1 == NULL && file2 == NULL) {
4296 return true;
4297 }
4298
4299 if (file1 == NULL || file2 == NULL) {
4300 return false;
4301 }
4302
4303 if (strcmp(file1, file2) == 0) {
4304 return true;
4305 }
4306
4307 HANDLE handle1 = create_read_only_file_handle(file1);
4308 HANDLE handle2 = create_read_only_file_handle(file2);
4309 bool result = false;
4310
4311 // if we could open both paths...
4312 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4313 BY_HANDLE_FILE_INFORMATION fileInfo1;
4314 BY_HANDLE_FILE_INFORMATION fileInfo2;
4315 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4316 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4317 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4318 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4319 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4320 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4321 result = true;
4322 }
4323 }
4324 }
4325
4326 //free the handles
4327 if (handle1 != INVALID_HANDLE_VALUE) {
4328 ::CloseHandle(handle1);
4329 }
4330
4331 if (handle2 != INVALID_HANDLE_VALUE) {
4332 ::CloseHandle(handle2);
4333 }
4334
4335 return result;
4336 }
4337
4338
4339 #define FT2INT64(ft) \
4340 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4341
4342
4343 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4344 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4345 // of a thread.
4346 //
4347 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4348 // the fast estimate available on the platform.
4349
4350 // current_thread_cpu_time() is not optimized for Windows yet
4351 jlong os::current_thread_cpu_time() {
4352 // return user + sys since the cost is the same
4353 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4354 }
4355
4356 jlong os::thread_cpu_time(Thread* thread) {
4357 // consistent with what current_thread_cpu_time() returns.
4358 return os::thread_cpu_time(thread, true /* user+sys */);
4359 }
4360
4361 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4362 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4363 }
4364
4365 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4366 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4367 // If this function changes, os::is_thread_cpu_time_supported() should too
4368 FILETIME CreationTime;
4369 FILETIME ExitTime;
4370 FILETIME KernelTime;
4371 FILETIME UserTime;
4372
4373 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4374 &ExitTime, &KernelTime, &UserTime) == 0) {
4375 return -1;
4376 } else if (user_sys_cpu_time) {
4377 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4378 } else {
4379 return FT2INT64(UserTime) * 100;
4380 }
4381 }
4382
4383 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4384 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4385 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4386 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4387 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4388 }
4389
4390 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4391 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4392 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4393 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4394 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4395 }
4396
4397 bool os::is_thread_cpu_time_supported() {
4398 // see os::thread_cpu_time
4399 FILETIME CreationTime;
4400 FILETIME ExitTime;
4401 FILETIME KernelTime;
4402 FILETIME UserTime;
4403
4404 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4405 &KernelTime, &UserTime) == 0) {
4406 return false;
4407 } else {
4408 return true;
4409 }
4410 }
4411
4412 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4413 // It does have primitives (PDH API) to get CPU usage and run queue length.
4414 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4415 // If we wanted to implement loadavg on Windows, we have a few options:
4416 //
4417 // a) Query CPU usage and run queue length and "fake" an answer by
4418 // returning the CPU usage if it's under 100%, and the run queue
4419 // length otherwise. It turns out that querying is pretty slow
4420 // on Windows, on the order of 200 microseconds on a fast machine.
4421 // Note that on the Windows the CPU usage value is the % usage
4422 // since the last time the API was called (and the first call
4423 // returns 100%), so we'd have to deal with that as well.
4424 //
4425 // b) Sample the "fake" answer using a sampling thread and store
4426 // the answer in a global variable. The call to loadavg would
4427 // just return the value of the global, avoiding the slow query.
4428 //
4429 // c) Sample a better answer using exponential decay to smooth the
4430 // value. This is basically the algorithm used by UNIX kernels.
4431 //
4432 // Note that sampling thread starvation could affect both (b) and (c).
4433 int os::loadavg(double loadavg[], int nelem) {
4434 return -1;
4435 }
4436
4437
4438 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4439 bool os::dont_yield() {
4440 return DontYieldALot;
4441 }
4442
4443 // This method is a slightly reworked copy of JDK's sysOpen
4444 // from src/windows/hpi/src/sys_api_md.c
4445
4446 int os::open(const char *path, int oflag, int mode) {
4447 char* pathbuf = (char*)os::strdup(path, mtInternal);
4448 if (pathbuf == NULL) {
4449 errno = ENOMEM;
4450 return -1;
4451 }
4452 os::native_path(pathbuf);
4453 int ret;
4454 if (strlen(path) < MAX_PATH) {
4455 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4456 } else {
4457 errno_t err = ERROR_SUCCESS;
4458 wchar_t* wpath = create_unc_path(pathbuf, err);
4459 if (err != ERROR_SUCCESS) {
4460 if (wpath != NULL) {
4461 destroy_unc_path(wpath);
4462 }
4463 os::free(pathbuf);
4464 errno = err;
4465 return -1;
4466 }
4467 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode);
4468 if (ret == -1) {
4469 errno = ::GetLastError();
4470 }
4471 destroy_unc_path(wpath);
4472 }
4473 os::free(pathbuf);
4474 return ret;
4475 }
4476
4477 FILE* os::open(int fd, const char* mode) {
4478 return ::_fdopen(fd, mode);
4479 }
4480
4481 // Is a (classpath) directory empty?
4482 bool os::dir_is_empty(const char* path) {
4483 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
4484 if (search_path == NULL) {
4485 errno = ENOMEM;
4486 return false;
4487 }
4488 strcpy(search_path, path);
4489 os::native_path(search_path);
4490 // Append "*", or possibly "\\*", to path
4491 if (search_path[1] == ':' &&
4492 (search_path[2] == '\0' ||
4493 (search_path[2] == '\\' && search_path[3] == '\0'))) {
4494 // No '\\' needed for cases like "Z:" or "Z:\"
4495 strcat(search_path, "*");
4496 }
4497 else {
4498 strcat(search_path, "\\*");
4499 }
4500 errno_t err = ERROR_SUCCESS;
4501 wchar_t* wpath = create_unc_path(search_path, err);
4502 if (err != ERROR_SUCCESS) {
4503 if (wpath != NULL) {
4504 destroy_unc_path(wpath);
4505 }
4506 os::free(search_path);
4507 errno = err;
4508 return false;
4509 }
4510 WIN32_FIND_DATAW fd;
4511 HANDLE f = ::FindFirstFileW(wpath, &fd);
4512 destroy_unc_path(wpath);
4513 bool is_empty = true;
4514 if (f != INVALID_HANDLE_VALUE) {
4515 while (is_empty && ::FindNextFileW(f, &fd)) {
4516 // An empty directory contains only the current directory file
4517 // and the previous directory file.
4518 if ((wcscmp(fd.cFileName, L".") != 0) &&
4519 (wcscmp(fd.cFileName, L"..") != 0)) {
4520 is_empty = false;
4521 }
4522 }
4523 FindClose(f);
4524 }
4525 os::free(search_path);
4526 return is_empty;
4527 }
4528
4529 // create binary file, rewriting existing file if required
4530 int os::create_binary_file(const char* path, bool rewrite_existing) {
4531 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4532 if (!rewrite_existing) {
4533 oflags |= _O_EXCL;
4534 }
4535 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4536 }
4537
4538 // return current position of file pointer
4539 jlong os::current_file_offset(int fd) {
4540 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4541 }
4542
4543 // move file pointer to the specified offset
4544 jlong os::seek_to_file_offset(int fd, jlong offset) {
4545 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4546 }
4547
4548
4549 jlong os::lseek(int fd, jlong offset, int whence) {
4550 return (jlong) ::_lseeki64(fd, offset, whence);
4551 }
4552
4553 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4554 OVERLAPPED ov;
4555 DWORD nread;
4556 BOOL result;
4557
4558 ZeroMemory(&ov, sizeof(ov));
4559 ov.Offset = (DWORD)offset;
4560 ov.OffsetHigh = (DWORD)(offset >> 32);
4561
4562 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4563
4564 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4565
4566 return result ? nread : 0;
4567 }
4568
4569
4570 // This method is a slightly reworked copy of JDK's sysNativePath
4571 // from src/windows/hpi/src/path_md.c
4572
4573 // Convert a pathname to native format. On win32, this involves forcing all
4574 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4575 // sometimes rejects '/') and removing redundant separators. The input path is
4576 // assumed to have been converted into the character encoding used by the local
4577 // system. Because this might be a double-byte encoding, care is taken to
4578 // treat double-byte lead characters correctly.
4579 //
4580 // This procedure modifies the given path in place, as the result is never
4581 // longer than the original. There is no error return; this operation always
4582 // succeeds.
4583 char * os::native_path(char *path) {
4584 char *src = path, *dst = path, *end = path;
4585 char *colon = NULL; // If a drive specifier is found, this will
4586 // point to the colon following the drive letter
4587
4588 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4589 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4590 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4591
4592 // Check for leading separators
4593 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4594 while (isfilesep(*src)) {
4595 src++;
4596 }
4597
4598 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4599 // Remove leading separators if followed by drive specifier. This
4600 // hack is necessary to support file URLs containing drive
4601 // specifiers (e.g., "file://c:/path"). As a side effect,
4602 // "/c:/path" can be used as an alternative to "c:/path".
4603 *dst++ = *src++;
4604 colon = dst;
4605 *dst++ = ':';
4606 src++;
4607 } else {
4608 src = path;
4609 if (isfilesep(src[0]) && isfilesep(src[1])) {
4610 // UNC pathname: Retain first separator; leave src pointed at
4611 // second separator so that further separators will be collapsed
4612 // into the second separator. The result will be a pathname
4613 // beginning with "\\\\" followed (most likely) by a host name.
4614 src = dst = path + 1;
4615 path[0] = '\\'; // Force first separator to '\\'
4616 }
4617 }
4618
4619 end = dst;
4620
4621 // Remove redundant separators from remainder of path, forcing all
4622 // separators to be '\\' rather than '/'. Also, single byte space
4623 // characters are removed from the end of the path because those
4624 // are not legal ending characters on this operating system.
4625 //
4626 while (*src != '\0') {
4627 if (isfilesep(*src)) {
4628 *dst++ = '\\'; src++;
4629 while (isfilesep(*src)) src++;
4630 if (*src == '\0') {
4631 // Check for trailing separator
4632 end = dst;
4633 if (colon == dst - 2) break; // "z:\\"
4634 if (dst == path + 1) break; // "\\"
4635 if (dst == path + 2 && isfilesep(path[0])) {
4636 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4637 // beginning of a UNC pathname. Even though it is not, by
4638 // itself, a valid UNC pathname, we leave it as is in order
4639 // to be consistent with the path canonicalizer as well
4640 // as the win32 APIs, which treat this case as an invalid
4641 // UNC pathname rather than as an alias for the root
4642 // directory of the current drive.
4643 break;
4644 }
4645 end = --dst; // Path does not denote a root directory, so
4646 // remove trailing separator
4647 break;
4648 }
4649 end = dst;
4650 } else {
4651 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4652 *dst++ = *src++;
4653 if (*src) *dst++ = *src++;
4654 end = dst;
4655 } else { // Copy a single-byte character
4656 char c = *src++;
4657 *dst++ = c;
4658 // Space is not a legal ending character
4659 if (c != ' ') end = dst;
4660 }
4661 }
4662 }
4663
4664 *end = '\0';
4665
4666 // For "z:", add "." to work around a bug in the C runtime library
4667 if (colon == dst - 1) {
4668 path[2] = '.';
4669 path[3] = '\0';
4670 }
4671
4672 return path;
4673 }
4674
4675 // This code is a copy of JDK's sysSetLength
4676 // from src/windows/hpi/src/sys_api_md.c
4677
4678 int os::ftruncate(int fd, jlong length) {
4679 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4680 long high = (long)(length >> 32);
4681 DWORD ret;
4682
4683 if (h == (HANDLE)(-1)) {
4684 return -1;
4685 }
4686
4687 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4688 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4689 return -1;
4690 }
4691
4692 if (::SetEndOfFile(h) == FALSE) {
4693 return -1;
4694 }
4695
4696 return 0;
4697 }
4698
4699 int os::get_fileno(FILE* fp) {
4700 return _fileno(fp);
4701 }
4702
4703 // This code is a copy of JDK's sysSync
4704 // from src/windows/hpi/src/sys_api_md.c
4705 // except for the legacy workaround for a bug in Win 98
4706
4707 int os::fsync(int fd) {
4708 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4709
4710 if ((!::FlushFileBuffers(handle)) &&
4711 (GetLastError() != ERROR_ACCESS_DENIED)) {
4712 // from winerror.h
4713 return -1;
4714 }
4715 return 0;
4716 }
4717
4718 static int nonSeekAvailable(int, long *);
4719 static int stdinAvailable(int, long *);
4720
4721 // This code is a copy of JDK's sysAvailable
4722 // from src/windows/hpi/src/sys_api_md.c
4723
4724 int os::available(int fd, jlong *bytes) {
4725 jlong cur, end;
4726 struct _stati64 stbuf64;
4727
4728 if (::_fstati64(fd, &stbuf64) >= 0) {
4729 int mode = stbuf64.st_mode;
4730 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4731 int ret;
4732 long lpbytes;
4733 if (fd == 0) {
4734 ret = stdinAvailable(fd, &lpbytes);
4735 } else {
4736 ret = nonSeekAvailable(fd, &lpbytes);
4737 }
4738 (*bytes) = (jlong)(lpbytes);
4739 return ret;
4740 }
4741 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4742 return FALSE;
4743 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4744 return FALSE;
4745 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4746 return FALSE;
4747 }
4748 *bytes = end - cur;
4749 return TRUE;
4750 } else {
4751 return FALSE;
4752 }
4753 }
4754
4755 void os::flockfile(FILE* fp) {
4756 _lock_file(fp);
4757 }
4758
4759 void os::funlockfile(FILE* fp) {
4760 _unlock_file(fp);
4761 }
4762
4763 // This code is a copy of JDK's nonSeekAvailable
4764 // from src/windows/hpi/src/sys_api_md.c
4765
4766 static int nonSeekAvailable(int fd, long *pbytes) {
4767 // This is used for available on non-seekable devices
4768 // (like both named and anonymous pipes, such as pipes
4769 // connected to an exec'd process).
4770 // Standard Input is a special case.
4771 HANDLE han;
4772
4773 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4774 return FALSE;
4775 }
4776
4777 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4778 // PeekNamedPipe fails when at EOF. In that case we
4779 // simply make *pbytes = 0 which is consistent with the
4780 // behavior we get on Solaris when an fd is at EOF.
4781 // The only alternative is to raise an Exception,
4782 // which isn't really warranted.
4783 //
4784 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4785 return FALSE;
4786 }
4787 *pbytes = 0;
4788 }
4789 return TRUE;
4790 }
4791
4792 #define MAX_INPUT_EVENTS 2000
4793
4794 // This code is a copy of JDK's stdinAvailable
4795 // from src/windows/hpi/src/sys_api_md.c
4796
4797 static int stdinAvailable(int fd, long *pbytes) {
4798 HANDLE han;
4799 DWORD numEventsRead = 0; // Number of events read from buffer
4800 DWORD numEvents = 0; // Number of events in buffer
4801 DWORD i = 0; // Loop index
4802 DWORD curLength = 0; // Position marker
4803 DWORD actualLength = 0; // Number of bytes readable
4804 BOOL error = FALSE; // Error holder
4805 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4806
4807 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4808 return FALSE;
4809 }
4810
4811 // Construct an array of input records in the console buffer
4812 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4813 if (error == 0) {
4814 return nonSeekAvailable(fd, pbytes);
4815 }
4816
4817 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4818 if (numEvents > MAX_INPUT_EVENTS) {
4819 numEvents = MAX_INPUT_EVENTS;
4820 }
4821
4822 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4823 if (lpBuffer == NULL) {
4824 return FALSE;
4825 }
4826
4827 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4828 if (error == 0) {
4829 os::free(lpBuffer);
4830 return FALSE;
4831 }
4832
4833 // Examine input records for the number of bytes available
4834 for (i=0; i<numEvents; i++) {
4835 if (lpBuffer[i].EventType == KEY_EVENT) {
4836
4837 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4838 &(lpBuffer[i].Event);
4839 if (keyRecord->bKeyDown == TRUE) {
4840 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4841 curLength++;
4842 if (*keyPressed == '\r') {
4843 actualLength = curLength;
4844 }
4845 }
4846 }
4847 }
4848
4849 if (lpBuffer != NULL) {
4850 os::free(lpBuffer);
4851 }
4852
4853 *pbytes = (long) actualLength;
4854 return TRUE;
4855 }
4856
4857 // Map a block of memory.
4858 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4859 char *addr, size_t bytes, bool read_only,
4860 bool allow_exec) {
4861 HANDLE hFile;
4862 char* base;
4863
4864 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4865 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4866 if (hFile == NULL) {
4867 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4868 return NULL;
4869 }
4870
4871 if (allow_exec) {
4872 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4873 // unless it comes from a PE image (which the shared archive is not.)
4874 // Even VirtualProtect refuses to give execute access to mapped memory
4875 // that was not previously executable.
4876 //
4877 // Instead, stick the executable region in anonymous memory. Yuck.
4878 // Penalty is that ~4 pages will not be shareable - in the future
4879 // we might consider DLLizing the shared archive with a proper PE
4880 // header so that mapping executable + sharing is possible.
4881
4882 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4883 PAGE_READWRITE);
4884 if (base == NULL) {
4885 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4886 CloseHandle(hFile);
4887 return NULL;
4888 }
4889
4890 // Record virtual memory allocation
4891 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
4892
4893 DWORD bytes_read;
4894 OVERLAPPED overlapped;
4895 overlapped.Offset = (DWORD)file_offset;
4896 overlapped.OffsetHigh = 0;
4897 overlapped.hEvent = NULL;
4898 // ReadFile guarantees that if the return value is true, the requested
4899 // number of bytes were read before returning.
4900 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4901 if (!res) {
4902 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4903 release_memory(base, bytes);
4904 CloseHandle(hFile);
4905 return NULL;
4906 }
4907 } else {
4908 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4909 NULL /* file_name */);
4910 if (hMap == NULL) {
4911 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4912 CloseHandle(hFile);
4913 return NULL;
4914 }
4915
4916 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4917 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4918 (DWORD)bytes, addr);
4919 if (base == NULL) {
4920 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4921 CloseHandle(hMap);
4922 CloseHandle(hFile);
4923 return NULL;
4924 }
4925
4926 if (CloseHandle(hMap) == 0) {
4927 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4928 CloseHandle(hFile);
4929 return base;
4930 }
4931 }
4932
4933 if (allow_exec) {
4934 DWORD old_protect;
4935 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4936 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4937
4938 if (!res) {
4939 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4940 // Don't consider this a hard error, on IA32 even if the
4941 // VirtualProtect fails, we should still be able to execute
4942 CloseHandle(hFile);
4943 return base;
4944 }
4945 }
4946
4947 if (CloseHandle(hFile) == 0) {
4948 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4949 return base;
4950 }
4951
4952 return base;
4953 }
4954
4955
4956 // Remap a block of memory.
4957 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4958 char *addr, size_t bytes, bool read_only,
4959 bool allow_exec) {
4960 // This OS does not allow existing memory maps to be remapped so we
4961 // would have to unmap the memory before we remap it.
4962
4963 // Because there is a small window between unmapping memory and mapping
4964 // it in again with different protections, CDS archives are mapped RW
4965 // on windows, so this function isn't called.
4966 ShouldNotReachHere();
4967 return NULL;
4968 }
4969
4970
4971 // Unmap a block of memory.
4972 // Returns true=success, otherwise false.
4973
4974 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4975 MEMORY_BASIC_INFORMATION mem_info;
4976 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4977 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4978 return false;
4979 }
4980
4981 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4982 // Instead, executable region was allocated using VirtualAlloc(). See
4983 // pd_map_memory() above.
4984 //
4985 // The following flags should match the 'exec_access' flages used for
4986 // VirtualProtect() in pd_map_memory().
4987 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4988 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4989 return pd_release_memory(addr, bytes);
4990 }
4991
4992 BOOL result = UnmapViewOfFile(addr);
4993 if (result == 0) {
4994 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4995 return false;
4996 }
4997 return true;
4998 }
4999
5000 void os::pause() {
5001 char filename[MAX_PATH];
5002 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5003 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5004 } else {
5005 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5006 }
5007
5008 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5009 if (fd != -1) {
5010 struct stat buf;
5011 ::close(fd);
5012 while (::stat(filename, &buf) == 0) {
5013 Sleep(100);
5014 }
5015 } else {
5016 jio_fprintf(stderr,
5017 "Could not open pause file '%s', continuing immediately.\n", filename);
5018 }
5019 }
5020
5021 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5022 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5023 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5024
5025 os::ThreadCrashProtection::ThreadCrashProtection() {
5026 }
5027
5028 // See the caveats for this class in os_windows.hpp
5029 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5030 // into this method and returns false. If no OS EXCEPTION was raised, returns
5031 // true.
5032 // The callback is supposed to provide the method that should be protected.
5033 //
5034 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5035
5036 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5037
5038 _protected_thread = Thread::current_or_null();
5039 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5040
5041 bool success = true;
5042 __try {
5043 _crash_protection = this;
5044 cb.call();
5045 } __except(EXCEPTION_EXECUTE_HANDLER) {
5046 // only for protection, nothing to do
5047 success = false;
5048 }
5049 _crash_protection = NULL;
5050 _protected_thread = NULL;
5051 Thread::muxRelease(&_crash_mux);
5052 return success;
5053 }
5054
5055
5056 class HighResolutionInterval : public CHeapObj<mtThread> {
5057 // The default timer resolution seems to be 10 milliseconds.
5058 // (Where is this written down?)
5059 // If someone wants to sleep for only a fraction of the default,
5060 // then we set the timer resolution down to 1 millisecond for
5061 // the duration of their interval.
5062 // We carefully set the resolution back, since otherwise we
5063 // seem to incur an overhead (3%?) that we don't need.
5064 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5065 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5066 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5067 // timeBeginPeriod() if the relative error exceeded some threshold.
5068 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5069 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5070 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5071 // resolution timers running.
5072 private:
5073 jlong resolution;
5074 public:
5075 HighResolutionInterval(jlong ms) {
5076 resolution = ms % 10L;
5077 if (resolution != 0) {
5078 MMRESULT result = timeBeginPeriod(1L);
5079 }
5080 }
5081 ~HighResolutionInterval() {
5082 if (resolution != 0) {
5083 MMRESULT result = timeEndPeriod(1L);
5084 }
5085 resolution = 0L;
5086 }
5087 };
5088
5089 // An Event wraps a win32 "CreateEvent" kernel handle.
5090 //
5091 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5092 //
5093 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5094 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5095 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5096 // In addition, an unpark() operation might fetch the handle field, but the
5097 // event could recycle between the fetch and the SetEvent() operation.
5098 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5099 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5100 // on an stale but recycled handle would be harmless, but in practice this might
5101 // confuse other non-Sun code, so it's not a viable approach.
5102 //
5103 // 2: Once a win32 event handle is associated with an Event, it remains associated
5104 // with the Event. The event handle is never closed. This could be construed
5105 // as handle leakage, but only up to the maximum # of threads that have been extant
5106 // at any one time. This shouldn't be an issue, as windows platforms typically
5107 // permit a process to have hundreds of thousands of open handles.
5108 //
5109 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5110 // and release unused handles.
5111 //
5112 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5113 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5114 //
5115 // 5. Use an RCU-like mechanism (Read-Copy Update).
5116 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5117 //
5118 // We use (2).
5119 //
5120 // TODO-FIXME:
5121 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5122 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5123 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5124 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5125 // into a single win32 CreateEvent() handle.
5126 //
5127 // Assumption:
5128 // Only one parker can exist on an event, which is why we allocate
5129 // them per-thread. Multiple unparkers can coexist.
5130 //
5131 // _Event transitions in park()
5132 // -1 => -1 : illegal
5133 // 1 => 0 : pass - return immediately
5134 // 0 => -1 : block; then set _Event to 0 before returning
5135 //
5136 // _Event transitions in unpark()
5137 // 0 => 1 : just return
5138 // 1 => 1 : just return
5139 // -1 => either 0 or 1; must signal target thread
5140 // That is, we can safely transition _Event from -1 to either
5141 // 0 or 1.
5142 //
5143 // _Event serves as a restricted-range semaphore.
5144 // -1 : thread is blocked, i.e. there is a waiter
5145 // 0 : neutral: thread is running or ready,
5146 // could have been signaled after a wait started
5147 // 1 : signaled - thread is running or ready
5148 //
5149 // Another possible encoding of _Event would be with
5150 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5151 //
5152
5153 int os::PlatformEvent::park(jlong Millis) {
5154 // Transitions for _Event:
5155 // -1 => -1 : illegal
5156 // 1 => 0 : pass - return immediately
5157 // 0 => -1 : block; then set _Event to 0 before returning
5158
5159 guarantee(_ParkHandle != NULL , "Invariant");
5160 guarantee(Millis > 0 , "Invariant");
5161
5162 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5163 // the initial park() operation.
5164 // Consider: use atomic decrement instead of CAS-loop
5165
5166 int v;
5167 for (;;) {
5168 v = _Event;
5169 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5170 }
5171 guarantee((v == 0) || (v == 1), "invariant");
5172 if (v != 0) return OS_OK;
5173
5174 // Do this the hard way by blocking ...
5175 // TODO: consider a brief spin here, gated on the success of recent
5176 // spin attempts by this thread.
5177 //
5178 // We decompose long timeouts into series of shorter timed waits.
5179 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5180 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5181 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5182 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5183 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5184 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5185 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5186 // for the already waited time. This policy does not admit any new outcomes.
5187 // In the future, however, we might want to track the accumulated wait time and
5188 // adjust Millis accordingly if we encounter a spurious wakeup.
5189
5190 const int MAXTIMEOUT = 0x10000000;
5191 DWORD rv = WAIT_TIMEOUT;
5192 while (_Event < 0 && Millis > 0) {
5193 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5194 if (Millis > MAXTIMEOUT) {
5195 prd = MAXTIMEOUT;
5196 }
5197 HighResolutionInterval *phri = NULL;
5198 if (!ForceTimeHighResolution) {
5199 phri = new HighResolutionInterval(prd);
5200 }
5201 rv = ::WaitForSingleObject(_ParkHandle, prd);
5202 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5203 if (rv == WAIT_TIMEOUT) {
5204 Millis -= prd;
5205 }
5206 delete phri; // if it is NULL, harmless
5207 }
5208 v = _Event;
5209 _Event = 0;
5210 // see comment at end of os::PlatformEvent::park() below:
5211 OrderAccess::fence();
5212 // If we encounter a nearly simultanous timeout expiry and unpark()
5213 // we return OS_OK indicating we awoke via unpark().
5214 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5215 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5216 }
5217
5218 void os::PlatformEvent::park() {
5219 // Transitions for _Event:
5220 // -1 => -1 : illegal
5221 // 1 => 0 : pass - return immediately
5222 // 0 => -1 : block; then set _Event to 0 before returning
5223
5224 guarantee(_ParkHandle != NULL, "Invariant");
5225 // Invariant: Only the thread associated with the Event/PlatformEvent
5226 // may call park().
5227 // Consider: use atomic decrement instead of CAS-loop
5228 int v;
5229 for (;;) {
5230 v = _Event;
5231 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5232 }
5233 guarantee((v == 0) || (v == 1), "invariant");
5234 if (v != 0) return;
5235
5236 // Do this the hard way by blocking ...
5237 // TODO: consider a brief spin here, gated on the success of recent
5238 // spin attempts by this thread.
5239 while (_Event < 0) {
5240 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5241 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5242 }
5243
5244 // Usually we'll find _Event == 0 at this point, but as
5245 // an optional optimization we clear it, just in case can
5246 // multiple unpark() operations drove _Event up to 1.
5247 _Event = 0;
5248 OrderAccess::fence();
5249 guarantee(_Event >= 0, "invariant");
5250 }
5251
5252 void os::PlatformEvent::unpark() {
5253 guarantee(_ParkHandle != NULL, "Invariant");
5254
5255 // Transitions for _Event:
5256 // 0 => 1 : just return
5257 // 1 => 1 : just return
5258 // -1 => either 0 or 1; must signal target thread
5259 // That is, we can safely transition _Event from -1 to either
5260 // 0 or 1.
5261 // See also: "Semaphores in Plan 9" by Mullender & Cox
5262 //
5263 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5264 // that it will take two back-to-back park() calls for the owning
5265 // thread to block. This has the benefit of forcing a spurious return
5266 // from the first park() call after an unpark() call which will help
5267 // shake out uses of park() and unpark() without condition variables.
5268
5269 if (Atomic::xchg(1, &_Event) >= 0) return;
5270
5271 ::SetEvent(_ParkHandle);
5272 }
5273
5274
5275 // JSR166
5276 // -------------------------------------------------------
5277
5278 // The Windows implementation of Park is very straightforward: Basic
5279 // operations on Win32 Events turn out to have the right semantics to
5280 // use them directly. We opportunistically resuse the event inherited
5281 // from Monitor.
5282
5283 void Parker::park(bool isAbsolute, jlong time) {
5284 guarantee(_ParkEvent != NULL, "invariant");
5285 // First, demultiplex/decode time arguments
5286 if (time < 0) { // don't wait
5287 return;
5288 } else if (time == 0 && !isAbsolute) {
5289 time = INFINITE;
5290 } else if (isAbsolute) {
5291 time -= os::javaTimeMillis(); // convert to relative time
5292 if (time <= 0) { // already elapsed
5293 return;
5294 }
5295 } else { // relative
5296 time /= 1000000; // Must coarsen from nanos to millis
5297 if (time == 0) { // Wait for the minimal time unit if zero
5298 time = 1;
5299 }
5300 }
5301
5302 JavaThread* thread = JavaThread::current();
5303
5304 // Don't wait if interrupted or already triggered
5305 if (thread->is_interrupted(false) ||
5306 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5307 ResetEvent(_ParkEvent);
5308 return;
5309 } else {
5310 ThreadBlockInVM tbivm(thread);
5311 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5312 thread->set_suspend_equivalent();
5313
5314 WaitForSingleObject(_ParkEvent, time);
5315 ResetEvent(_ParkEvent);
5316
5317 // If externally suspended while waiting, re-suspend
5318 if (thread->handle_special_suspend_equivalent_condition()) {
5319 thread->java_suspend_self();
5320 }
5321 }
5322 }
5323
5324 void Parker::unpark() {
5325 guarantee(_ParkEvent != NULL, "invariant");
5326 SetEvent(_ParkEvent);
5327 }
5328
5329 // Platform Monitor implementation
5330
5331 // Must already be locked
5332 int os::PlatformMonitor::wait(jlong millis) {
5333 assert(millis >= 0, "negative timeout");
5334 int ret = OS_TIMEOUT;
5335 int status = SleepConditionVariableCS(&_cond, &_mutex,
5336 millis == 0 ? INFINITE : millis);
5337 if (status != 0) {
5338 ret = OS_OK;
5339 }
5340 #ifndef PRODUCT
5341 else {
5342 DWORD err = GetLastError();
5343 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5344 }
5345 #endif
5346 return ret;
5347 }
5348
5349 // Run the specified command in a separate process. Return its exit value,
5350 // or -1 on failure (e.g. can't create a new process).
5351 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5352 STARTUPINFO si;
5353 PROCESS_INFORMATION pi;
5354 DWORD exit_code;
5355
5356 char * cmd_string;
5357 const char * cmd_prefix = "cmd /C ";
5358 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5359 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5360 if (cmd_string == NULL) {
5361 return -1;
5362 }
5363 cmd_string[0] = '\0';
5364 strcat(cmd_string, cmd_prefix);
5365 strcat(cmd_string, cmd);
5366
5367 // now replace all '\n' with '&'
5368 char * substring = cmd_string;
5369 while ((substring = strchr(substring, '\n')) != NULL) {
5370 substring[0] = '&';
5371 substring++;
5372 }
5373 memset(&si, 0, sizeof(si));
5374 si.cb = sizeof(si);
5375 memset(&pi, 0, sizeof(pi));
5376 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5377 cmd_string, // command line
5378 NULL, // process security attribute
5379 NULL, // thread security attribute
5380 TRUE, // inherits system handles
5381 0, // no creation flags
5382 NULL, // use parent's environment block
5383 NULL, // use parent's starting directory
5384 &si, // (in) startup information
5385 &pi); // (out) process information
5386
5387 if (rslt) {
5388 // Wait until child process exits.
5389 WaitForSingleObject(pi.hProcess, INFINITE);
5390
5391 GetExitCodeProcess(pi.hProcess, &exit_code);
5392
5393 // Close process and thread handles.
5394 CloseHandle(pi.hProcess);
5395 CloseHandle(pi.hThread);
5396 } else {
5397 exit_code = -1;
5398 }
5399
5400 FREE_C_HEAP_ARRAY(char, cmd_string);
5401 return (int)exit_code;
5402 }
5403
5404 bool os::find(address addr, outputStream* st) {
5405 int offset = -1;
5406 bool result = false;
5407 char buf[256];
5408 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5409 st->print(PTR_FORMAT " ", addr);
5410 if (strlen(buf) < sizeof(buf) - 1) {
5411 char* p = strrchr(buf, '\\');
5412 if (p) {
5413 st->print("%s", p + 1);
5414 } else {
5415 st->print("%s", buf);
5416 }
5417 } else {
5418 // The library name is probably truncated. Let's omit the library name.
5419 // See also JDK-8147512.
5420 }
5421 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5422 st->print("::%s + 0x%x", buf, offset);
5423 }
5424 st->cr();
5425 result = true;
5426 }
5427 return result;
5428 }
5429
5430 static jint initSock() {
5431 WSADATA wsadata;
5432
5433 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5434 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5435 ::GetLastError());
5436 return JNI_ERR;
5437 }
5438 return JNI_OK;
5439 }
5440
5441 struct hostent* os::get_host_by_name(char* name) {
5442 return (struct hostent*)gethostbyname(name);
5443 }
5444
5445 int os::socket_close(int fd) {
5446 return ::closesocket(fd);
5447 }
5448
5449 int os::socket(int domain, int type, int protocol) {
5450 return ::socket(domain, type, protocol);
5451 }
5452
5453 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5454 return ::connect(fd, him, len);
5455 }
5456
5457 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5458 return ::recv(fd, buf, (int)nBytes, flags);
5459 }
5460
5461 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5462 return ::send(fd, buf, (int)nBytes, flags);
5463 }
5464
5465 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5466 return ::send(fd, buf, (int)nBytes, flags);
5467 }
5468
5469 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5470 #if defined(IA32)
5471 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5472 #elif defined (AMD64)
5473 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5474 #endif
5475
5476 // returns true if thread could be suspended,
5477 // false otherwise
5478 static bool do_suspend(HANDLE* h) {
5479 if (h != NULL) {
5480 if (SuspendThread(*h) != ~0) {
5481 return true;
5482 }
5483 }
5484 return false;
5485 }
5486
5487 // resume the thread
5488 // calling resume on an active thread is a no-op
5489 static void do_resume(HANDLE* h) {
5490 if (h != NULL) {
5491 ResumeThread(*h);
5492 }
5493 }
5494
5495 // retrieve a suspend/resume context capable handle
5496 // from the tid. Caller validates handle return value.
5497 void get_thread_handle_for_extended_context(HANDLE* h,
5498 OSThread::thread_id_t tid) {
5499 if (h != NULL) {
5500 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5501 }
5502 }
5503
5504 // Thread sampling implementation
5505 //
5506 void os::SuspendedThreadTask::internal_do_task() {
5507 CONTEXT ctxt;
5508 HANDLE h = NULL;
5509
5510 // get context capable handle for thread
5511 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5512
5513 // sanity
5514 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5515 return;
5516 }
5517
5518 // suspend the thread
5519 if (do_suspend(&h)) {
5520 ctxt.ContextFlags = sampling_context_flags;
5521 // get thread context
5522 GetThreadContext(h, &ctxt);
5523 SuspendedThreadTaskContext context(_thread, &ctxt);
5524 // pass context to Thread Sampling impl
5525 do_task(context);
5526 // resume thread
5527 do_resume(&h);
5528 }
5529
5530 // close handle
5531 CloseHandle(h);
5532 }
5533
5534 bool os::start_debugging(char *buf, int buflen) {
5535 int len = (int)strlen(buf);
5536 char *p = &buf[len];
5537
5538 jio_snprintf(p, buflen-len,
5539 "\n\n"
5540 "Do you want to debug the problem?\n\n"
5541 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5542 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5543 "Otherwise, select 'No' to abort...",
5544 os::current_process_id(), os::current_thread_id());
5545
5546 bool yes = os::message_box("Unexpected Error", buf);
5547
5548 if (yes) {
5549 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5550 // exception. If VM is running inside a debugger, the debugger will
5551 // catch the exception. Otherwise, the breakpoint exception will reach
5552 // the default windows exception handler, which can spawn a debugger and
5553 // automatically attach to the dying VM.
5554 os::breakpoint();
5555 yes = false;
5556 }
5557 return yes;
5558 }
5559
5560 void* os::get_default_process_handle() {
5561 return (void*)GetModuleHandle(NULL);
5562 }
5563
5564 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5565 // which is used to find statically linked in agents.
5566 // Additionally for windows, takes into account __stdcall names.
5567 // Parameters:
5568 // sym_name: Symbol in library we are looking for
5569 // lib_name: Name of library to look in, NULL for shared libs.
5570 // is_absolute_path == true if lib_name is absolute path to agent
5571 // such as "C:/a/b/L.dll"
5572 // == false if only the base name of the library is passed in
5573 // such as "L"
5574 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5575 bool is_absolute_path) {
5576 char *agent_entry_name;
5577 size_t len;
5578 size_t name_len;
5579 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5580 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5581 const char *start;
5582
5583 if (lib_name != NULL) {
5584 len = name_len = strlen(lib_name);
5585 if (is_absolute_path) {
5586 // Need to strip path, prefix and suffix
5587 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5588 lib_name = ++start;
5589 } else {
5590 // Need to check for drive prefix
5591 if ((start = strchr(lib_name, ':')) != NULL) {
5592 lib_name = ++start;
5593 }
5594 }
5595 if (len <= (prefix_len + suffix_len)) {
5596 return NULL;
5597 }
5598 lib_name += prefix_len;
5599 name_len = strlen(lib_name) - suffix_len;
5600 }
5601 }
5602 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5603 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5604 if (agent_entry_name == NULL) {
5605 return NULL;
5606 }
5607 if (lib_name != NULL) {
5608 const char *p = strrchr(sym_name, '@');
5609 if (p != NULL && p != sym_name) {
5610 // sym_name == _Agent_OnLoad@XX
5611 strncpy(agent_entry_name, sym_name, (p - sym_name));
5612 agent_entry_name[(p-sym_name)] = '\0';
5613 // agent_entry_name == _Agent_OnLoad
5614 strcat(agent_entry_name, "_");
5615 strncat(agent_entry_name, lib_name, name_len);
5616 strcat(agent_entry_name, p);
5617 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5618 } else {
5619 strcpy(agent_entry_name, sym_name);
5620 strcat(agent_entry_name, "_");
5621 strncat(agent_entry_name, lib_name, name_len);
5622 }
5623 } else {
5624 strcpy(agent_entry_name, sym_name);
5625 }
5626 return agent_entry_name;
5627 }
5628
5629 #ifndef PRODUCT
5630
5631 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5632 // contiguous memory block at a particular address.
5633 // The test first tries to find a good approximate address to allocate at by using the same
5634 // method to allocate some memory at any address. The test then tries to allocate memory in
5635 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5636 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5637 // the previously allocated memory is available for allocation. The only actual failure
5638 // that is reported is when the test tries to allocate at a particular location but gets a
5639 // different valid one. A NULL return value at this point is not considered an error but may
5640 // be legitimate.
5641 void TestReserveMemorySpecial_test() {
5642 if (!UseLargePages) {
5643 return;
5644 }
5645 // save current value of globals
5646 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5647 bool old_use_numa_interleaving = UseNUMAInterleaving;
5648
5649 // set globals to make sure we hit the correct code path
5650 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5651
5652 // do an allocation at an address selected by the OS to get a good one.
5653 const size_t large_allocation_size = os::large_page_size() * 4;
5654 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5655 if (result == NULL) {
5656 } else {
5657 os::release_memory_special(result, large_allocation_size);
5658
5659 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5660 // we managed to get it once.
5661 const size_t expected_allocation_size = os::large_page_size();
5662 char* expected_location = result + os::large_page_size();
5663 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5664 if (actual_location == NULL) {
5665 } else {
5666 // release memory
5667 os::release_memory_special(actual_location, expected_allocation_size);
5668 // only now check, after releasing any memory to avoid any leaks.
5669 assert(actual_location == expected_location,
5670 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5671 expected_location, expected_allocation_size, actual_location);
5672 }
5673 }
5674
5675 // restore globals
5676 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5677 UseNUMAInterleaving = old_use_numa_interleaving;
5678 }
5679 #endif // PRODUCT
5680
5681 /*
5682 All the defined signal names for Windows.
5683
5684 NOTE that not all of these names are accepted by FindSignal!
5685
5686 For various reasons some of these may be rejected at runtime.
5687
5688 Here are the names currently accepted by a user of sun.misc.Signal with
5689 1.4.1 (ignoring potential interaction with use of chaining, etc):
5690
5691 (LIST TBD)
5692
5693 */
5694 int os::get_signal_number(const char* name) {
5695 static const struct {
5696 const char* name;
5697 int number;
5698 } siglabels [] =
5699 // derived from version 6.0 VC98/include/signal.h
5700 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5701 "FPE", SIGFPE, // floating point exception
5702 "SEGV", SIGSEGV, // segment violation
5703 "INT", SIGINT, // interrupt
5704 "TERM", SIGTERM, // software term signal from kill
5705 "BREAK", SIGBREAK, // Ctrl-Break sequence
5706 "ILL", SIGILL}; // illegal instruction
5707 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5708 if (strcmp(name, siglabels[i].name) == 0) {
5709 return siglabels[i].number;
5710 }
5711 }
5712 return -1;
5713 }
5714
5715 // Fast current thread access
5716
5717 int os::win32::_thread_ptr_offset = 0;
5718
5719 static void call_wrapper_dummy() {}
5720
5721 // We need to call the os_exception_wrapper once so that it sets
5722 // up the offset from FS of the thread pointer.
5723 void os::win32::initialize_thread_ptr_offset() {
5724 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5725 NULL, NULL, NULL, NULL);
5726 }
5727
5728 bool os::supports_map_sync() {
5729 return false;
5730 }