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