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