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