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