1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84
85 #include <windows.h>
86 #include <sys/types.h>
87 #include <sys/stat.h>
88 #include <sys/timeb.h>
89 #include <objidl.h>
90 #include <shlobj.h>
91
92 #include <malloc.h>
93 #include <signal.h>
94 #include <direct.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <io.h>
98 #include <process.h> // For _beginthreadex(), _endthreadex()
99 #include <imagehlp.h> // For os::dll_address_to_function_name
100 // for enumerating dll libraries
101 #include <vdmdbg.h>
102 #include <psapi.h>
103 #include <mmsystem.h>
104 #include <winsock2.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(-1)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _M_AMD64
124 #define __CPU__ amd64
125 #else
126 #define __CPU__ i486
127 #endif
128
129 #if INCLUDE_AOT
130 PVOID topLevelVectoredExceptionHandler = NULL;
131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
132 #endif
133
134 // save DLL module handle, used by GetModuleFileName
135
136 HINSTANCE vm_lib_handle;
137
138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
139 switch (reason) {
140 case DLL_PROCESS_ATTACH:
141 vm_lib_handle = hinst;
142 if (ForceTimeHighResolution) {
143 timeBeginPeriod(1L);
144 }
145 WindowsDbgHelp::pre_initialize();
146 SymbolEngine::pre_initialize();
147 break;
148 case DLL_PROCESS_DETACH:
149 if (ForceTimeHighResolution) {
150 timeEndPeriod(1L);
151 }
152 #if INCLUDE_AOT
153 if (topLevelVectoredExceptionHandler != NULL) {
154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
155 topLevelVectoredExceptionHandler = NULL;
156 }
157 #endif
158 break;
159 default:
160 break;
161 }
162 return true;
163 }
164
165 static inline double fileTimeAsDouble(FILETIME* time) {
166 const double high = (double) ((unsigned int) ~0);
167 const double split = 10000000.0;
168 double result = (time->dwLowDateTime / split) +
169 time->dwHighDateTime * (high/split);
170 return result;
171 }
172
173 // Implementation of os
174
175 bool os::unsetenv(const char* name) {
176 assert(name != NULL, "Null pointer");
177 return (SetEnvironmentVariable(name, NULL) == TRUE);
178 }
179
180 // No setuid programs under Windows.
181 bool os::have_special_privileges() {
182 return false;
183 }
184
185
186 // This method is a periodic task to check for misbehaving JNI applications
187 // under CheckJNI, we can add any periodic checks here.
188 // For Windows at the moment does nothing
189 void os::run_periodic_checks() {
190 return;
191 }
192
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197
198 void os::init_system_properties_values() {
199 // sysclasspath, java_home, dll_dir
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 const char *bin = "\\bin";
205 char home_dir[MAX_PATH + 1];
206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
207
208 if (alt_home_dir != NULL) {
209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
210 home_dir[MAX_PATH] = '\0';
211 } else {
212 os::jvm_path(home_dir, sizeof(home_dir));
213 // Found the full path to jvm.dll.
214 // Now cut the path to <java_home>/jre if we can.
215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \{client|server}
219 pslash = strrchr(home_dir, '\\');
220 if (pslash != NULL) {
221 *pslash = '\0'; // get rid of \bin
222 }
223 }
224 }
225
226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
227 strcpy(home_path, home_dir);
228 Arguments::set_java_home(home_path);
229 FREE_C_HEAP_ARRAY(char, home_path);
230
231 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
232 mtInternal);
233 strcpy(dll_path, home_dir);
234 strcat(dll_path, bin);
235 Arguments::set_dll_dir(dll_path);
236 FREE_C_HEAP_ARRAY(char, dll_path);
237
238 if (!set_boot_path('\\', ';')) {
239 vm_exit_during_initialization("Failed setting boot class path.", NULL);
240 }
241 }
242
243 // library_path
244 #define EXT_DIR "\\lib\\ext"
245 #define BIN_DIR "\\bin"
246 #define PACKAGE_DIR "\\Sun\\Java"
247 {
248 // Win32 library search order (See the documentation for LoadLibrary):
249 //
250 // 1. The directory from which application is loaded.
251 // 2. The system wide Java Extensions directory (Java only)
252 // 3. System directory (GetSystemDirectory)
253 // 4. Windows directory (GetWindowsDirectory)
254 // 5. The PATH environment variable
255 // 6. The current directory
256
257 char *library_path;
258 char tmp[MAX_PATH];
259 char *path_str = ::getenv("PATH");
260
261 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
262 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
263
264 library_path[0] = '\0';
265
266 GetModuleFileName(NULL, tmp, sizeof(tmp));
267 *(strrchr(tmp, '\\')) = '\0';
268 strcat(library_path, tmp);
269
270 GetWindowsDirectory(tmp, sizeof(tmp));
271 strcat(library_path, ";");
272 strcat(library_path, tmp);
273 strcat(library_path, PACKAGE_DIR BIN_DIR);
274
275 GetSystemDirectory(tmp, sizeof(tmp));
276 strcat(library_path, ";");
277 strcat(library_path, tmp);
278
279 GetWindowsDirectory(tmp, sizeof(tmp));
280 strcat(library_path, ";");
281 strcat(library_path, tmp);
282
283 if (path_str) {
284 strcat(library_path, ";");
285 strcat(library_path, path_str);
286 }
287
288 strcat(library_path, ";.");
289
290 Arguments::set_library_path(library_path);
291 FREE_C_HEAP_ARRAY(char, library_path);
292 }
293
294 // Default extensions directory
295 {
296 char path[MAX_PATH];
297 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
298 GetWindowsDirectory(path, MAX_PATH);
299 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
300 path, PACKAGE_DIR, EXT_DIR);
301 Arguments::set_ext_dirs(buf);
302 }
303 #undef EXT_DIR
304 #undef BIN_DIR
305 #undef PACKAGE_DIR
306
307 #ifndef _WIN64
308 // set our UnhandledExceptionFilter and save any previous one
309 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
310 #endif
311
312 // Done
313 return;
314 }
315
316 void os::breakpoint() {
317 DebugBreak();
318 }
319
320 // Invoked from the BREAKPOINT Macro
321 extern "C" void breakpoint() {
322 os::breakpoint();
323 }
324
325 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
326 // So far, this method is only used by Native Memory Tracking, which is
327 // only supported on Windows XP or later.
328 //
329 int os::get_native_stack(address* stack, int frames, int toSkip) {
330 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
331 for (int index = captured; index < frames; index ++) {
332 stack[index] = NULL;
333 }
334 return captured;
335 }
336
337
338 // os::current_stack_base()
339 //
340 // Returns the base of the stack, which is the stack's
341 // starting address. This function must be called
342 // while running on the stack of the thread being queried.
343
344 address os::current_stack_base() {
345 MEMORY_BASIC_INFORMATION minfo;
346 address stack_bottom;
347 size_t stack_size;
348
349 VirtualQuery(&minfo, &minfo, sizeof(minfo));
350 stack_bottom = (address)minfo.AllocationBase;
351 stack_size = minfo.RegionSize;
352
353 // Add up the sizes of all the regions with the same
354 // AllocationBase.
355 while (1) {
356 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
357 if (stack_bottom == (address)minfo.AllocationBase) {
358 stack_size += minfo.RegionSize;
359 } else {
360 break;
361 }
362 }
363 return stack_bottom + stack_size;
364 }
365
366 size_t os::current_stack_size() {
367 size_t sz;
368 MEMORY_BASIC_INFORMATION minfo;
369 VirtualQuery(&minfo, &minfo, sizeof(minfo));
370 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
371 return sz;
372 }
373
374 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
375 MEMORY_BASIC_INFORMATION minfo;
376 committed_start = NULL;
377 committed_size = 0;
378 address top = start + size;
379 const address start_addr = start;
380 while (start < top) {
381 VirtualQuery(start, &minfo, sizeof(minfo));
382 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
383 if (committed_start != NULL) {
384 break;
385 }
386 } else { // committed
387 if (committed_start == NULL) {
388 committed_start = start;
389 }
390 size_t offset = start - (address)minfo.BaseAddress;
391 committed_size += minfo.RegionSize - offset;
392 }
393 start = (address)minfo.BaseAddress + minfo.RegionSize;
394 }
395
396 if (committed_start == NULL) {
397 assert(committed_size == 0, "Sanity");
398 return false;
399 } else {
400 assert(committed_start >= start_addr && committed_start < top, "Out of range");
401 // current region may go beyond the limit, trim to the limit
402 committed_size = MIN2(committed_size, size_t(top - committed_start));
403 return true;
404 }
405 }
406
407 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
408 const struct tm* time_struct_ptr = localtime(clock);
409 if (time_struct_ptr != NULL) {
410 *res = *time_struct_ptr;
411 return res;
412 }
413 return NULL;
414 }
415
416 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
417 const struct tm* time_struct_ptr = gmtime(clock);
418 if (time_struct_ptr != NULL) {
419 *res = *time_struct_ptr;
420 return res;
421 }
422 return NULL;
423 }
424
425 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
426
427 // Thread start routine for all newly created threads
428 static unsigned __stdcall thread_native_entry(Thread* thread) {
429
430 thread->record_stack_base_and_size();
431
432 // Try to randomize the cache line index of hot stack frames.
433 // This helps when threads of the same stack traces evict each other's
434 // cache lines. The threads can be either from the same JVM instance, or
435 // from different JVM instances. The benefit is especially true for
436 // processors with hyperthreading technology.
437 static int counter = 0;
438 int pid = os::current_process_id();
439 _alloca(((pid ^ counter++) & 7) * 128);
440
441 thread->initialize_thread_current();
442
443 OSThread* osthr = thread->osthread();
444 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
445
446 if (UseNUMA) {
447 int lgrp_id = os::numa_get_group_id();
448 if (lgrp_id != -1) {
449 thread->set_lgrp_id(lgrp_id);
450 }
451 }
452
453 // Diagnostic code to investigate JDK-6573254
454 int res = 30115; // non-java thread
455 if (thread->is_Java_thread()) {
456 res = 20115; // java thread
457 }
458
459 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
460
461 // Install a win32 structured exception handler around every thread created
462 // by VM, so VM can generate error dump when an exception occurred in non-
463 // Java thread (e.g. VM thread).
464 __try {
465 thread->call_run();
466 } __except(topLevelExceptionFilter(
467 (_EXCEPTION_POINTERS*)_exception_info())) {
468 // Nothing to do.
469 }
470
471 // Note: at this point the thread object may already have deleted itself.
472 // Do not dereference it from here on out.
473
474 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
475
476 // One less thread is executing
477 // When the VMThread gets here, the main thread may have already exited
478 // which frees the CodeHeap containing the Atomic::add code
479 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
480 Atomic::dec(&os::win32::_os_thread_count);
481 }
482
483 // Thread must not return from exit_process_or_thread(), but if it does,
484 // let it proceed to exit normally
485 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
486 }
487
488 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
489 int thread_id) {
490 // Allocate the OSThread object
491 OSThread* osthread = new OSThread(NULL, NULL);
492 if (osthread == NULL) return NULL;
493
494 // Initialize the JDK library's interrupt event.
495 // This should really be done when OSThread is constructed,
496 // but there is no way for a constructor to report failure to
497 // allocate the event.
498 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
499 if (interrupt_event == NULL) {
500 delete osthread;
501 return NULL;
502 }
503 osthread->set_interrupt_event(interrupt_event);
504
505 // Store info on the Win32 thread into the OSThread
506 osthread->set_thread_handle(thread_handle);
507 osthread->set_thread_id(thread_id);
508
509 if (UseNUMA) {
510 int lgrp_id = os::numa_get_group_id();
511 if (lgrp_id != -1) {
512 thread->set_lgrp_id(lgrp_id);
513 }
514 }
515
516 // Initial thread state is INITIALIZED, not SUSPENDED
517 osthread->set_state(INITIALIZED);
518
519 return osthread;
520 }
521
522
523 bool os::create_attached_thread(JavaThread* thread) {
524 #ifdef ASSERT
525 thread->verify_not_published();
526 #endif
527 HANDLE thread_h;
528 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
529 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
530 fatal("DuplicateHandle failed\n");
531 }
532 OSThread* osthread = create_os_thread(thread, thread_h,
533 (int)current_thread_id());
534 if (osthread == NULL) {
535 return false;
536 }
537
538 // Initial thread state is RUNNABLE
539 osthread->set_state(RUNNABLE);
540
541 thread->set_osthread(osthread);
542
543 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
544 os::current_thread_id());
545
546 return true;
547 }
548
549 bool os::create_main_thread(JavaThread* thread) {
550 #ifdef ASSERT
551 thread->verify_not_published();
552 #endif
553 if (_starting_thread == NULL) {
554 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
555 if (_starting_thread == NULL) {
556 return false;
557 }
558 }
559
560 // The primordial thread is runnable from the start)
561 _starting_thread->set_state(RUNNABLE);
562
563 thread->set_osthread(_starting_thread);
564 return true;
565 }
566
567 // Helper function to trace _beginthreadex attributes,
568 // similar to os::Posix::describe_pthread_attr()
569 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
570 size_t stacksize, unsigned initflag) {
571 stringStream ss(buf, buflen);
572 if (stacksize == 0) {
573 ss.print("stacksize: default, ");
574 } else {
575 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
576 }
577 ss.print("flags: ");
578 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
579 #define ALL(X) \
580 X(CREATE_SUSPENDED) \
581 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
582 ALL(PRINT_FLAG)
583 #undef ALL
584 #undef PRINT_FLAG
585 return buf;
586 }
587
588 // Allocate and initialize a new OSThread
589 bool os::create_thread(Thread* thread, ThreadType thr_type,
590 size_t stack_size) {
591 unsigned thread_id;
592
593 // Allocate the OSThread object
594 OSThread* osthread = new OSThread(NULL, NULL);
595 if (osthread == NULL) {
596 return false;
597 }
598
599 // Initialize the JDK library's interrupt event.
600 // This should really be done when OSThread is constructed,
601 // but there is no way for a constructor to report failure to
602 // allocate the event.
603 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
604 if (interrupt_event == NULL) {
605 delete osthread;
606 return false;
607 }
608 osthread->set_interrupt_event(interrupt_event);
609 // We don't call set_interrupted(false) as it will trip the assert in there
610 // as we are not operating on the current thread. We don't need to call it
611 // because the initial state is already correct.
612
613 thread->set_osthread(osthread);
614
615 if (stack_size == 0) {
616 switch (thr_type) {
617 case os::java_thread:
618 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
619 if (JavaThread::stack_size_at_create() > 0) {
620 stack_size = JavaThread::stack_size_at_create();
621 }
622 break;
623 case os::compiler_thread:
624 if (CompilerThreadStackSize > 0) {
625 stack_size = (size_t)(CompilerThreadStackSize * K);
626 break;
627 } // else fall through:
628 // use VMThreadStackSize if CompilerThreadStackSize is not defined
629 case os::vm_thread:
630 case os::pgc_thread:
631 case os::cgc_thread:
632 case os::watcher_thread:
633 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
634 break;
635 }
636 }
637
638 // Create the Win32 thread
639 //
640 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
641 // does not specify stack size. Instead, it specifies the size of
642 // initially committed space. The stack size is determined by
643 // PE header in the executable. If the committed "stack_size" is larger
644 // than default value in the PE header, the stack is rounded up to the
645 // nearest multiple of 1MB. For example if the launcher has default
646 // stack size of 320k, specifying any size less than 320k does not
647 // affect the actual stack size at all, it only affects the initial
648 // commitment. On the other hand, specifying 'stack_size' larger than
649 // default value may cause significant increase in memory usage, because
650 // not only the stack space will be rounded up to MB, but also the
651 // entire space is committed upfront.
652 //
653 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
654 // for CreateThread() that can treat 'stack_size' as stack size. However we
655 // are not supposed to call CreateThread() directly according to MSDN
656 // document because JVM uses C runtime library. The good news is that the
657 // flag appears to work with _beginthredex() as well.
658
659 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
660 HANDLE thread_handle =
661 (HANDLE)_beginthreadex(NULL,
662 (unsigned)stack_size,
663 (unsigned (__stdcall *)(void*)) thread_native_entry,
664 thread,
665 initflag,
666 &thread_id);
667
668 char buf[64];
669 if (thread_handle != NULL) {
670 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
671 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
672 } else {
673 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
674 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
675 // Log some OS information which might explain why creating the thread failed.
676 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
677 LogStream st(Log(os, thread)::info());
678 os::print_memory_info(&st);
679 }
680
681 if (thread_handle == NULL) {
682 // Need to clean up stuff we've allocated so far
683 thread->set_osthread(NULL);
684 delete osthread;
685 return false;
686 }
687
688 Atomic::inc(&os::win32::_os_thread_count);
689
690 // Store info on the Win32 thread into the OSThread
691 osthread->set_thread_handle(thread_handle);
692 osthread->set_thread_id(thread_id);
693
694 // Initial thread state is INITIALIZED, not SUSPENDED
695 osthread->set_state(INITIALIZED);
696
697 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
698 return true;
699 }
700
701
702 // Free Win32 resources related to the OSThread
703 void os::free_thread(OSThread* osthread) {
704 assert(osthread != NULL, "osthread not set");
705
706 // We are told to free resources of the argument thread,
707 // but we can only really operate on the current thread.
708 assert(Thread::current()->osthread() == osthread,
709 "os::free_thread but not current thread");
710
711 CloseHandle(osthread->thread_handle());
712 delete osthread;
713 }
714
715 static jlong first_filetime;
716 static jlong initial_performance_count;
717 static jlong performance_frequency;
718
719
720 jlong as_long(LARGE_INTEGER x) {
721 jlong result = 0; // initialization to avoid warning
722 set_high(&result, x.HighPart);
723 set_low(&result, x.LowPart);
724 return result;
725 }
726
727
728 jlong os::elapsed_counter() {
729 LARGE_INTEGER count;
730 QueryPerformanceCounter(&count);
731 return as_long(count) - initial_performance_count;
732 }
733
734
735 jlong os::elapsed_frequency() {
736 return performance_frequency;
737 }
738
739
740 julong os::available_memory() {
741 return win32::available_memory();
742 }
743
744 julong os::win32::available_memory() {
745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
746 // value if total memory is larger than 4GB
747 MEMORYSTATUSEX ms;
748 ms.dwLength = sizeof(ms);
749 GlobalMemoryStatusEx(&ms);
750
751 return (julong)ms.ullAvailPhys;
752 }
753
754 julong os::physical_memory() {
755 return win32::physical_memory();
756 }
757
758 bool os::has_allocatable_memory_limit(julong* limit) {
759 MEMORYSTATUSEX ms;
760 ms.dwLength = sizeof(ms);
761 GlobalMemoryStatusEx(&ms);
762 #ifdef _LP64
763 *limit = (julong)ms.ullAvailVirtual;
764 return true;
765 #else
766 // Limit to 1400m because of the 2gb address space wall
767 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
768 return true;
769 #endif
770 }
771
772 int os::active_processor_count() {
773 // User has overridden the number of active processors
774 if (ActiveProcessorCount > 0) {
775 log_trace(os)("active_processor_count: "
776 "active processor count set by user : %d",
777 ActiveProcessorCount);
778 return ActiveProcessorCount;
779 }
780
781 DWORD_PTR lpProcessAffinityMask = 0;
782 DWORD_PTR lpSystemAffinityMask = 0;
783 int proc_count = processor_count();
784 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
785 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
786 // Nof active processors is number of bits in process affinity mask
787 int bitcount = 0;
788 while (lpProcessAffinityMask != 0) {
789 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
790 bitcount++;
791 }
792 return bitcount;
793 } else {
794 return proc_count;
795 }
796 }
797
798 void os::set_native_thread_name(const char *name) {
799
800 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
801 //
802 // Note that unfortunately this only works if the process
803 // is already attached to a debugger; debugger must observe
804 // the exception below to show the correct name.
805
806 // If there is no debugger attached skip raising the exception
807 if (!IsDebuggerPresent()) {
808 return;
809 }
810
811 const DWORD MS_VC_EXCEPTION = 0x406D1388;
812 struct {
813 DWORD dwType; // must be 0x1000
814 LPCSTR szName; // pointer to name (in user addr space)
815 DWORD dwThreadID; // thread ID (-1=caller thread)
816 DWORD dwFlags; // reserved for future use, must be zero
817 } info;
818
819 info.dwType = 0x1000;
820 info.szName = name;
821 info.dwThreadID = -1;
822 info.dwFlags = 0;
823
824 __try {
825 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
826 } __except(EXCEPTION_EXECUTE_HANDLER) {}
827 }
828
829 bool os::distribute_processes(uint length, uint* distribution) {
830 // Not yet implemented.
831 return false;
832 }
833
834 bool os::bind_to_processor(uint processor_id) {
835 // Not yet implemented.
836 return false;
837 }
838
839 void os::win32::initialize_performance_counter() {
840 LARGE_INTEGER count;
841 QueryPerformanceFrequency(&count);
842 performance_frequency = as_long(count);
843 QueryPerformanceCounter(&count);
844 initial_performance_count = as_long(count);
845 }
846
847
848 double os::elapsedTime() {
849 return (double) elapsed_counter() / (double) elapsed_frequency();
850 }
851
852
853 // Windows format:
854 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
855 // Java format:
856 // Java standards require the number of milliseconds since 1/1/1970
857
858 // Constant offset - calculated using offset()
859 static jlong _offset = 116444736000000000;
860 // Fake time counter for reproducible results when debugging
861 static jlong fake_time = 0;
862
863 #ifdef ASSERT
864 // Just to be safe, recalculate the offset in debug mode
865 static jlong _calculated_offset = 0;
866 static int _has_calculated_offset = 0;
867
868 jlong offset() {
869 if (_has_calculated_offset) return _calculated_offset;
870 SYSTEMTIME java_origin;
871 java_origin.wYear = 1970;
872 java_origin.wMonth = 1;
873 java_origin.wDayOfWeek = 0; // ignored
874 java_origin.wDay = 1;
875 java_origin.wHour = 0;
876 java_origin.wMinute = 0;
877 java_origin.wSecond = 0;
878 java_origin.wMilliseconds = 0;
879 FILETIME jot;
880 if (!SystemTimeToFileTime(&java_origin, &jot)) {
881 fatal("Error = %d\nWindows error", GetLastError());
882 }
883 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
884 _has_calculated_offset = 1;
885 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
886 return _calculated_offset;
887 }
888 #else
889 jlong offset() {
890 return _offset;
891 }
892 #endif
893
894 jlong windows_to_java_time(FILETIME wt) {
895 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
896 return (a - offset()) / 10000;
897 }
898
899 // Returns time ticks in (10th of micro seconds)
900 jlong windows_to_time_ticks(FILETIME wt) {
901 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
902 return (a - offset());
903 }
904
905 FILETIME java_to_windows_time(jlong l) {
906 jlong a = (l * 10000) + offset();
907 FILETIME result;
908 result.dwHighDateTime = high(a);
909 result.dwLowDateTime = low(a);
910 return result;
911 }
912
913 bool os::supports_vtime() { return true; }
914 bool os::enable_vtime() { return false; }
915 bool os::vtime_enabled() { return false; }
916
917 double os::elapsedVTime() {
918 FILETIME created;
919 FILETIME exited;
920 FILETIME kernel;
921 FILETIME user;
922 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
923 // the resolution of windows_to_java_time() should be sufficient (ms)
924 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
925 } else {
926 return elapsedTime();
927 }
928 }
929
930 jlong os::javaTimeMillis() {
931 FILETIME wt;
932 GetSystemTimeAsFileTime(&wt);
933 return windows_to_java_time(wt);
934 }
935
936 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
937 FILETIME wt;
938 GetSystemTimeAsFileTime(&wt);
939 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
940 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
941 seconds = secs;
942 nanos = jlong(ticks - (secs*10000000)) * 100;
943 }
944
945 jlong os::javaTimeNanos() {
946 LARGE_INTEGER current_count;
947 QueryPerformanceCounter(¤t_count);
948 double current = as_long(current_count);
949 double freq = performance_frequency;
950 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
951 return time;
952 }
953
954 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
955 jlong freq = performance_frequency;
956 if (freq < NANOSECS_PER_SEC) {
957 // the performance counter is 64 bits and we will
958 // be multiplying it -- so no wrap in 64 bits
959 info_ptr->max_value = ALL_64_BITS;
960 } else if (freq > NANOSECS_PER_SEC) {
961 // use the max value the counter can reach to
962 // determine the max value which could be returned
963 julong max_counter = (julong)ALL_64_BITS;
964 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
965 } else {
966 // the performance counter is 64 bits and we will
967 // be using it directly -- so no wrap in 64 bits
968 info_ptr->max_value = ALL_64_BITS;
969 }
970
971 // using a counter, so no skipping
972 info_ptr->may_skip_backward = false;
973 info_ptr->may_skip_forward = false;
974
975 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
976 }
977
978 char* os::local_time_string(char *buf, size_t buflen) {
979 SYSTEMTIME st;
980 GetLocalTime(&st);
981 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
982 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
983 return buf;
984 }
985
986 bool os::getTimesSecs(double* process_real_time,
987 double* process_user_time,
988 double* process_system_time) {
989 HANDLE h_process = GetCurrentProcess();
990 FILETIME create_time, exit_time, kernel_time, user_time;
991 BOOL result = GetProcessTimes(h_process,
992 &create_time,
993 &exit_time,
994 &kernel_time,
995 &user_time);
996 if (result != 0) {
997 FILETIME wt;
998 GetSystemTimeAsFileTime(&wt);
999 jlong rtc_millis = windows_to_java_time(wt);
1000 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
1001 *process_user_time =
1002 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1003 *process_system_time =
1004 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1005 return true;
1006 } else {
1007 return false;
1008 }
1009 }
1010
1011 void os::shutdown() {
1012 // allow PerfMemory to attempt cleanup of any persistent resources
1013 perfMemory_exit();
1014
1015 // flush buffered output, finish log files
1016 ostream_abort();
1017
1018 // Check for abort hook
1019 abort_hook_t abort_hook = Arguments::abort_hook();
1020 if (abort_hook != NULL) {
1021 abort_hook();
1022 }
1023 }
1024
1025
1026 static HANDLE dumpFile = NULL;
1027
1028 // Check if dump file can be created.
1029 void os::check_dump_limit(char* buffer, size_t buffsz) {
1030 bool status = true;
1031 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1032 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1033 status = false;
1034 }
1035
1036 #ifndef ASSERT
1037 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1038 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1039 status = false;
1040 }
1041 #endif
1042
1043 if (status) {
1044 const char* cwd = get_current_directory(NULL, 0);
1045 int pid = current_process_id();
1046 if (cwd != NULL) {
1047 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1048 } else {
1049 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1050 }
1051
1052 if (dumpFile == NULL &&
1053 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1054 == INVALID_HANDLE_VALUE) {
1055 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1056 status = false;
1057 }
1058 }
1059 VMError::record_coredump_status(buffer, status);
1060 }
1061
1062 void os::abort(bool dump_core, void* siginfo, const void* context) {
1063 EXCEPTION_POINTERS ep;
1064 MINIDUMP_EXCEPTION_INFORMATION mei;
1065 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1066
1067 HANDLE hProcess = GetCurrentProcess();
1068 DWORD processId = GetCurrentProcessId();
1069 MINIDUMP_TYPE dumpType;
1070
1071 shutdown();
1072 if (!dump_core || dumpFile == NULL) {
1073 if (dumpFile != NULL) {
1074 CloseHandle(dumpFile);
1075 }
1076 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1077 }
1078
1079 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1080 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1081
1082 if (siginfo != NULL && context != NULL) {
1083 ep.ContextRecord = (PCONTEXT) context;
1084 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1085
1086 mei.ThreadId = GetCurrentThreadId();
1087 mei.ExceptionPointers = &ep;
1088 pmei = &mei;
1089 } else {
1090 pmei = NULL;
1091 }
1092
1093 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1094 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1095 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1096 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1097 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1098 }
1099 CloseHandle(dumpFile);
1100 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1101 }
1102
1103 // Die immediately, no exit hook, no abort hook, no cleanup.
1104 void os::die() {
1105 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1106 }
1107
1108 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1109 // * dirent_md.c 1.15 00/02/02
1110 //
1111 // The declarations for DIR and struct dirent are in jvm_win32.h.
1112
1113 // Caller must have already run dirname through JVM_NativePath, which removes
1114 // duplicate slashes and converts all instances of '/' into '\\'.
1115
1116 DIR * os::opendir(const char *dirname) {
1117 assert(dirname != NULL, "just checking"); // hotspot change
1118 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1119 DWORD fattr; // hotspot change
1120 char alt_dirname[4] = { 0, 0, 0, 0 };
1121
1122 if (dirp == 0) {
1123 errno = ENOMEM;
1124 return 0;
1125 }
1126
1127 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1128 // as a directory in FindFirstFile(). We detect this case here and
1129 // prepend the current drive name.
1130 //
1131 if (dirname[1] == '\0' && dirname[0] == '\\') {
1132 alt_dirname[0] = _getdrive() + 'A' - 1;
1133 alt_dirname[1] = ':';
1134 alt_dirname[2] = '\\';
1135 alt_dirname[3] = '\0';
1136 dirname = alt_dirname;
1137 }
1138
1139 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1140 if (dirp->path == 0) {
1141 free(dirp);
1142 errno = ENOMEM;
1143 return 0;
1144 }
1145 strcpy(dirp->path, dirname);
1146
1147 fattr = GetFileAttributes(dirp->path);
1148 if (fattr == 0xffffffff) {
1149 free(dirp->path);
1150 free(dirp);
1151 errno = ENOENT;
1152 return 0;
1153 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1154 free(dirp->path);
1155 free(dirp);
1156 errno = ENOTDIR;
1157 return 0;
1158 }
1159
1160 // Append "*.*", or possibly "\\*.*", to path
1161 if (dirp->path[1] == ':' &&
1162 (dirp->path[2] == '\0' ||
1163 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1164 // No '\\' needed for cases like "Z:" or "Z:\"
1165 strcat(dirp->path, "*.*");
1166 } else {
1167 strcat(dirp->path, "\\*.*");
1168 }
1169
1170 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1171 if (dirp->handle == INVALID_HANDLE_VALUE) {
1172 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1173 free(dirp->path);
1174 free(dirp);
1175 errno = EACCES;
1176 return 0;
1177 }
1178 }
1179 return dirp;
1180 }
1181
1182 struct dirent * os::readdir(DIR *dirp) {
1183 assert(dirp != NULL, "just checking"); // hotspot change
1184 if (dirp->handle == INVALID_HANDLE_VALUE) {
1185 return NULL;
1186 }
1187
1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1189
1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1191 if (GetLastError() == ERROR_INVALID_HANDLE) {
1192 errno = EBADF;
1193 return NULL;
1194 }
1195 FindClose(dirp->handle);
1196 dirp->handle = INVALID_HANDLE_VALUE;
1197 }
1198
1199 return &dirp->dirent;
1200 }
1201
1202 int os::closedir(DIR *dirp) {
1203 assert(dirp != NULL, "just checking"); // hotspot change
1204 if (dirp->handle != INVALID_HANDLE_VALUE) {
1205 if (!FindClose(dirp->handle)) {
1206 errno = EBADF;
1207 return -1;
1208 }
1209 dirp->handle = INVALID_HANDLE_VALUE;
1210 }
1211 free(dirp->path);
1212 free(dirp);
1213 return 0;
1214 }
1215
1216 // This must be hard coded because it's the system's temporary
1217 // directory not the java application's temp directory, ala java.io.tmpdir.
1218 const char* os::get_temp_directory() {
1219 static char path_buf[MAX_PATH];
1220 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1221 return path_buf;
1222 } else {
1223 path_buf[0] = '\0';
1224 return path_buf;
1225 }
1226 }
1227
1228 // Needs to be in os specific directory because windows requires another
1229 // header file <direct.h>
1230 const char* os::get_current_directory(char *buf, size_t buflen) {
1231 int n = static_cast<int>(buflen);
1232 if (buflen > INT_MAX) n = INT_MAX;
1233 return _getcwd(buf, n);
1234 }
1235
1236 //-----------------------------------------------------------
1237 // Helper functions for fatal error handler
1238 #ifdef _WIN64
1239 // Helper routine which returns true if address in
1240 // within the NTDLL address space.
1241 //
1242 static bool _addr_in_ntdll(address addr) {
1243 HMODULE hmod;
1244 MODULEINFO minfo;
1245
1246 hmod = GetModuleHandle("NTDLL.DLL");
1247 if (hmod == NULL) return false;
1248 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1249 &minfo, sizeof(MODULEINFO))) {
1250 return false;
1251 }
1252
1253 if ((addr >= minfo.lpBaseOfDll) &&
1254 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1255 return true;
1256 } else {
1257 return false;
1258 }
1259 }
1260 #endif
1261
1262 struct _modinfo {
1263 address addr;
1264 char* full_path; // point to a char buffer
1265 int buflen; // size of the buffer
1266 address base_addr;
1267 };
1268
1269 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1270 address top_address, void * param) {
1271 struct _modinfo *pmod = (struct _modinfo *)param;
1272 if (!pmod) return -1;
1273
1274 if (base_addr <= pmod->addr &&
1275 top_address > pmod->addr) {
1276 // if a buffer is provided, copy path name to the buffer
1277 if (pmod->full_path) {
1278 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1279 }
1280 pmod->base_addr = base_addr;
1281 return 1;
1282 }
1283 return 0;
1284 }
1285
1286 bool os::dll_address_to_library_name(address addr, char* buf,
1287 int buflen, int* offset) {
1288 // buf is not optional, but offset is optional
1289 assert(buf != NULL, "sanity check");
1290
1291 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1292 // return the full path to the DLL file, sometimes it returns path
1293 // to the corresponding PDB file (debug info); sometimes it only
1294 // returns partial path, which makes life painful.
1295
1296 struct _modinfo mi;
1297 mi.addr = addr;
1298 mi.full_path = buf;
1299 mi.buflen = buflen;
1300 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1301 // buf already contains path name
1302 if (offset) *offset = addr - mi.base_addr;
1303 return true;
1304 }
1305
1306 buf[0] = '\0';
1307 if (offset) *offset = -1;
1308 return false;
1309 }
1310
1311 bool os::dll_address_to_function_name(address addr, char *buf,
1312 int buflen, int *offset,
1313 bool demangle) {
1314 // buf is not optional, but offset is optional
1315 assert(buf != NULL, "sanity check");
1316
1317 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1318 return true;
1319 }
1320 if (offset != NULL) *offset = -1;
1321 buf[0] = '\0';
1322 return false;
1323 }
1324
1325 // save the start and end address of jvm.dll into param[0] and param[1]
1326 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1327 address top_address, void * param) {
1328 if (!param) return -1;
1329
1330 if (base_addr <= (address)_locate_jvm_dll &&
1331 top_address > (address)_locate_jvm_dll) {
1332 ((address*)param)[0] = base_addr;
1333 ((address*)param)[1] = top_address;
1334 return 1;
1335 }
1336 return 0;
1337 }
1338
1339 address vm_lib_location[2]; // start and end address of jvm.dll
1340
1341 // check if addr is inside jvm.dll
1342 bool os::address_is_in_vm(address addr) {
1343 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1344 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1345 assert(false, "Can't find jvm module.");
1346 return false;
1347 }
1348 }
1349
1350 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1351 }
1352
1353 // print module info; param is outputStream*
1354 static int _print_module(const char* fname, address base_address,
1355 address top_address, void* param) {
1356 if (!param) return -1;
1357
1358 outputStream* st = (outputStream*)param;
1359
1360 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1361 return 0;
1362 }
1363
1364 // Loads .dll/.so and
1365 // in case of error it checks if .dll/.so was built for the
1366 // same architecture as Hotspot is running on
1367 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1368 log_info(os)("attempting shared library load of %s", name);
1369
1370 void * result = LoadLibrary(name);
1371 if (result != NULL) {
1372 Events::log(NULL, "Loaded shared library %s", name);
1373 // Recalculate pdb search path if a DLL was loaded successfully.
1374 SymbolEngine::recalc_search_path();
1375 log_info(os)("shared library load of %s was successful", name);
1376 return result;
1377 }
1378 DWORD errcode = GetLastError();
1379 // Read system error message into ebuf
1380 // It may or may not be overwritten below (in the for loop and just above)
1381 lasterror(ebuf, (size_t) ebuflen);
1382 ebuf[ebuflen - 1] = '\0';
1383 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1384 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1385
1386 if (errcode == ERROR_MOD_NOT_FOUND) {
1387 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1388 ebuf[ebuflen - 1] = '\0';
1389 return NULL;
1390 }
1391
1392 // Parsing dll below
1393 // If we can read dll-info and find that dll was built
1394 // for an architecture other than Hotspot is running in
1395 // - then print to buffer "DLL was built for a different architecture"
1396 // else call os::lasterror to obtain system error message
1397 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1398 if (fd < 0) {
1399 return NULL;
1400 }
1401
1402 uint32_t signature_offset;
1403 uint16_t lib_arch = 0;
1404 bool failed_to_get_lib_arch =
1405 ( // Go to position 3c in the dll
1406 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1407 ||
1408 // Read location of signature
1409 (sizeof(signature_offset) !=
1410 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1411 ||
1412 // Go to COFF File Header in dll
1413 // that is located after "signature" (4 bytes long)
1414 (os::seek_to_file_offset(fd,
1415 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1416 ||
1417 // Read field that contains code of architecture
1418 // that dll was built for
1419 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1420 );
1421
1422 ::close(fd);
1423 if (failed_to_get_lib_arch) {
1424 // file i/o error - report os::lasterror(...) msg
1425 return NULL;
1426 }
1427
1428 typedef struct {
1429 uint16_t arch_code;
1430 char* arch_name;
1431 } arch_t;
1432
1433 static const arch_t arch_array[] = {
1434 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1435 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1436 };
1437 #if (defined _M_AMD64)
1438 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1439 #elif (defined _M_IX86)
1440 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1441 #else
1442 #error Method os::dll_load requires that one of following \
1443 is defined :_M_AMD64 or _M_IX86
1444 #endif
1445
1446
1447 // Obtain a string for printf operation
1448 // lib_arch_str shall contain string what platform this .dll was built for
1449 // running_arch_str shall string contain what platform Hotspot was built for
1450 char *running_arch_str = NULL, *lib_arch_str = NULL;
1451 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1452 if (lib_arch == arch_array[i].arch_code) {
1453 lib_arch_str = arch_array[i].arch_name;
1454 }
1455 if (running_arch == arch_array[i].arch_code) {
1456 running_arch_str = arch_array[i].arch_name;
1457 }
1458 }
1459
1460 assert(running_arch_str,
1461 "Didn't find running architecture code in arch_array");
1462
1463 // If the architecture is right
1464 // but some other error took place - report os::lasterror(...) msg
1465 if (lib_arch == running_arch) {
1466 return NULL;
1467 }
1468
1469 if (lib_arch_str != NULL) {
1470 ::_snprintf(ebuf, ebuflen - 1,
1471 "Can't load %s-bit .dll on a %s-bit platform",
1472 lib_arch_str, running_arch_str);
1473 } else {
1474 // don't know what architecture this dll was build for
1475 ::_snprintf(ebuf, ebuflen - 1,
1476 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1477 lib_arch, running_arch_str);
1478 }
1479
1480 return NULL;
1481 }
1482
1483 void os::print_dll_info(outputStream *st) {
1484 st->print_cr("Dynamic libraries:");
1485 get_loaded_modules_info(_print_module, (void *)st);
1486 }
1487
1488 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1489 HANDLE hProcess;
1490
1491 # define MAX_NUM_MODULES 128
1492 HMODULE modules[MAX_NUM_MODULES];
1493 static char filename[MAX_PATH];
1494 int result = 0;
1495
1496 int pid = os::current_process_id();
1497 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1498 FALSE, pid);
1499 if (hProcess == NULL) return 0;
1500
1501 DWORD size_needed;
1502 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1503 CloseHandle(hProcess);
1504 return 0;
1505 }
1506
1507 // number of modules that are currently loaded
1508 int num_modules = size_needed / sizeof(HMODULE);
1509
1510 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1511 // Get Full pathname:
1512 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1513 filename[0] = '\0';
1514 }
1515
1516 MODULEINFO modinfo;
1517 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1518 modinfo.lpBaseOfDll = NULL;
1519 modinfo.SizeOfImage = 0;
1520 }
1521
1522 // Invoke callback function
1523 result = callback(filename, (address)modinfo.lpBaseOfDll,
1524 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1525 if (result) break;
1526 }
1527
1528 CloseHandle(hProcess);
1529 return result;
1530 }
1531
1532 bool os::get_host_name(char* buf, size_t buflen) {
1533 DWORD size = (DWORD)buflen;
1534 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1535 }
1536
1537 void os::get_summary_os_info(char* buf, size_t buflen) {
1538 stringStream sst(buf, buflen);
1539 os::win32::print_windows_version(&sst);
1540 // chop off newline character
1541 char* nl = strchr(buf, '\n');
1542 if (nl != NULL) *nl = '\0';
1543 }
1544
1545 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1546 #if _MSC_VER >= 1900
1547 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1548 int result = ::vsnprintf(buf, len, fmt, args);
1549 // If an encoding error occurred (result < 0) then it's not clear
1550 // whether the buffer is NUL terminated, so ensure it is.
1551 if ((result < 0) && (len > 0)) {
1552 buf[len - 1] = '\0';
1553 }
1554 return result;
1555 #else
1556 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1557 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1558 // versions. However, when len == 0, avoid _vsnprintf too, and just
1559 // go straight to _vscprintf. The output is going to be truncated in
1560 // that case, except in the unusual case of empty output. More
1561 // importantly, the documentation for various versions of Visual Studio
1562 // are inconsistent about the behavior of _vsnprintf when len == 0,
1563 // including it possibly being an error.
1564 int result = -1;
1565 if (len > 0) {
1566 result = _vsnprintf(buf, len, fmt, args);
1567 // If output (including NUL terminator) is truncated, the buffer
1568 // won't be NUL terminated. Add the trailing NUL specified by C99.
1569 if ((result < 0) || ((size_t)result >= len)) {
1570 buf[len - 1] = '\0';
1571 }
1572 }
1573 if (result < 0) {
1574 result = _vscprintf(fmt, args);
1575 }
1576 return result;
1577 #endif // _MSC_VER dispatch
1578 }
1579
1580 static inline time_t get_mtime(const char* filename) {
1581 struct stat st;
1582 int ret = os::stat(filename, &st);
1583 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1584 return st.st_mtime;
1585 }
1586
1587 int os::compare_file_modified_times(const char* file1, const char* file2) {
1588 time_t t1 = get_mtime(file1);
1589 time_t t2 = get_mtime(file2);
1590 return t1 - t2;
1591 }
1592
1593 void os::print_os_info_brief(outputStream* st) {
1594 os::print_os_info(st);
1595 }
1596
1597 void os::print_os_info(outputStream* st) {
1598 #ifdef ASSERT
1599 char buffer[1024];
1600 st->print("HostName: ");
1601 if (get_host_name(buffer, sizeof(buffer))) {
1602 st->print("%s ", buffer);
1603 } else {
1604 st->print("N/A ");
1605 }
1606 #endif
1607 st->print("OS:");
1608 os::win32::print_windows_version(st);
1609
1610 #ifdef _LP64
1611 VM_Version::print_platform_virtualization_info(st);
1612 #endif
1613 }
1614
1615 void os::win32::print_windows_version(outputStream* st) {
1616 OSVERSIONINFOEX osvi;
1617 VS_FIXEDFILEINFO *file_info;
1618 TCHAR kernel32_path[MAX_PATH];
1619 UINT len, ret;
1620
1621 // Use the GetVersionEx information to see if we're on a server or
1622 // workstation edition of Windows. Starting with Windows 8.1 we can't
1623 // trust the OS version information returned by this API.
1624 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1625 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1626 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1627 st->print_cr("Call to GetVersionEx failed");
1628 return;
1629 }
1630 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1631
1632 // Get the full path to \Windows\System32\kernel32.dll and use that for
1633 // determining what version of Windows we're running on.
1634 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1635 ret = GetSystemDirectory(kernel32_path, len);
1636 if (ret == 0 || ret > len) {
1637 st->print_cr("Call to GetSystemDirectory failed");
1638 return;
1639 }
1640 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1641
1642 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1643 if (version_size == 0) {
1644 st->print_cr("Call to GetFileVersionInfoSize failed");
1645 return;
1646 }
1647
1648 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1649 if (version_info == NULL) {
1650 st->print_cr("Failed to allocate version_info");
1651 return;
1652 }
1653
1654 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1655 os::free(version_info);
1656 st->print_cr("Call to GetFileVersionInfo failed");
1657 return;
1658 }
1659
1660 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1661 os::free(version_info);
1662 st->print_cr("Call to VerQueryValue failed");
1663 return;
1664 }
1665
1666 int major_version = HIWORD(file_info->dwProductVersionMS);
1667 int minor_version = LOWORD(file_info->dwProductVersionMS);
1668 int build_number = HIWORD(file_info->dwProductVersionLS);
1669 int build_minor = LOWORD(file_info->dwProductVersionLS);
1670 int os_vers = major_version * 1000 + minor_version;
1671 os::free(version_info);
1672
1673 st->print(" Windows ");
1674 switch (os_vers) {
1675
1676 case 6000:
1677 if (is_workstation) {
1678 st->print("Vista");
1679 } else {
1680 st->print("Server 2008");
1681 }
1682 break;
1683
1684 case 6001:
1685 if (is_workstation) {
1686 st->print("7");
1687 } else {
1688 st->print("Server 2008 R2");
1689 }
1690 break;
1691
1692 case 6002:
1693 if (is_workstation) {
1694 st->print("8");
1695 } else {
1696 st->print("Server 2012");
1697 }
1698 break;
1699
1700 case 6003:
1701 if (is_workstation) {
1702 st->print("8.1");
1703 } else {
1704 st->print("Server 2012 R2");
1705 }
1706 break;
1707
1708 case 10000:
1709 if (is_workstation) {
1710 st->print("10");
1711 } else {
1712 // distinguish Windows Server 2016 and 2019 by build number
1713 // Windows server 2019 GA 10/2018 build number is 17763
1714 if (build_number > 17762) {
1715 st->print("Server 2019");
1716 } else {
1717 st->print("Server 2016");
1718 }
1719 }
1720 break;
1721
1722 default:
1723 // Unrecognized windows, print out its major and minor versions
1724 st->print("%d.%d", major_version, minor_version);
1725 break;
1726 }
1727
1728 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1729 // find out whether we are running on 64 bit processor or not
1730 SYSTEM_INFO si;
1731 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1732 GetNativeSystemInfo(&si);
1733 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1734 st->print(" , 64 bit");
1735 }
1736
1737 st->print(" Build %d", build_number);
1738 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1739 st->cr();
1740 }
1741
1742 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1743 // Nothing to do for now.
1744 }
1745
1746 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1747 HKEY key;
1748 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1749 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1750 if (status == ERROR_SUCCESS) {
1751 DWORD size = (DWORD)buflen;
1752 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1753 if (status != ERROR_SUCCESS) {
1754 strncpy(buf, "## __CPU__", buflen);
1755 }
1756 RegCloseKey(key);
1757 } else {
1758 // Put generic cpu info to return
1759 strncpy(buf, "## __CPU__", buflen);
1760 }
1761 }
1762
1763 void os::print_memory_info(outputStream* st) {
1764 st->print("Memory:");
1765 st->print(" %dk page", os::vm_page_size()>>10);
1766
1767 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1768 // value if total memory is larger than 4GB
1769 MEMORYSTATUSEX ms;
1770 ms.dwLength = sizeof(ms);
1771 int r1 = GlobalMemoryStatusEx(&ms);
1772
1773 if (r1 != 0) {
1774 st->print(", system-wide physical " INT64_FORMAT "M ",
1775 (int64_t) ms.ullTotalPhys >> 20);
1776 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1777
1778 st->print("TotalPageFile size " INT64_FORMAT "M ",
1779 (int64_t) ms.ullTotalPageFile >> 20);
1780 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1781 (int64_t) ms.ullAvailPageFile >> 20);
1782
1783 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1784 #if defined(_M_IX86)
1785 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1786 (int64_t) ms.ullTotalVirtual >> 20);
1787 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1788 #endif
1789 } else {
1790 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1791 }
1792
1793 // extended memory statistics for a process
1794 PROCESS_MEMORY_COUNTERS_EX pmex;
1795 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1796 pmex.cb = sizeof(pmex);
1797 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1798
1799 if (r2 != 0) {
1800 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1801 (int64_t) pmex.WorkingSetSize >> 20);
1802 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1803
1804 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1805 (int64_t) pmex.PrivateUsage >> 20);
1806 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1807 } else {
1808 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1809 }
1810
1811 st->cr();
1812 }
1813
1814 bool os::signal_sent_by_kill(const void* siginfo) {
1815 // TODO: Is this possible?
1816 return false;
1817 }
1818
1819 void os::print_siginfo(outputStream *st, const void* siginfo) {
1820 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1821 st->print("siginfo:");
1822
1823 char tmp[64];
1824 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1825 strcpy(tmp, "EXCEPTION_??");
1826 }
1827 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1828
1829 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1830 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1831 er->NumberParameters >= 2) {
1832 switch (er->ExceptionInformation[0]) {
1833 case 0: st->print(", reading address"); break;
1834 case 1: st->print(", writing address"); break;
1835 case 8: st->print(", data execution prevention violation at address"); break;
1836 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1837 er->ExceptionInformation[0]);
1838 }
1839 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1840 } else {
1841 int num = er->NumberParameters;
1842 if (num > 0) {
1843 st->print(", ExceptionInformation=");
1844 for (int i = 0; i < num; i++) {
1845 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1846 }
1847 }
1848 }
1849 st->cr();
1850 }
1851
1852 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1853 // TODO: Can we kill thread?
1854 return false;
1855 }
1856
1857 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1858 // do nothing
1859 }
1860
1861 static char saved_jvm_path[MAX_PATH] = {0};
1862
1863 // Find the full path to the current module, jvm.dll
1864 void os::jvm_path(char *buf, jint buflen) {
1865 // Error checking.
1866 if (buflen < MAX_PATH) {
1867 assert(false, "must use a large-enough buffer");
1868 buf[0] = '\0';
1869 return;
1870 }
1871 // Lazy resolve the path to current module.
1872 if (saved_jvm_path[0] != 0) {
1873 strcpy(buf, saved_jvm_path);
1874 return;
1875 }
1876
1877 buf[0] = '\0';
1878 if (Arguments::sun_java_launcher_is_altjvm()) {
1879 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1880 // for a JAVA_HOME environment variable and fix up the path so it
1881 // looks like jvm.dll is installed there (append a fake suffix
1882 // hotspot/jvm.dll).
1883 char* java_home_var = ::getenv("JAVA_HOME");
1884 if (java_home_var != NULL && java_home_var[0] != 0 &&
1885 strlen(java_home_var) < (size_t)buflen) {
1886 strncpy(buf, java_home_var, buflen);
1887
1888 // determine if this is a legacy image or modules image
1889 // modules image doesn't have "jre" subdirectory
1890 size_t len = strlen(buf);
1891 char* jrebin_p = buf + len;
1892 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1893 if (0 != _access(buf, 0)) {
1894 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1895 }
1896 len = strlen(buf);
1897 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1898 }
1899 }
1900
1901 if (buf[0] == '\0') {
1902 GetModuleFileName(vm_lib_handle, buf, buflen);
1903 }
1904 strncpy(saved_jvm_path, buf, MAX_PATH);
1905 saved_jvm_path[MAX_PATH - 1] = '\0';
1906 }
1907
1908
1909 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1910 #ifndef _WIN64
1911 st->print("_");
1912 #endif
1913 }
1914
1915
1916 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1917 #ifndef _WIN64
1918 st->print("@%d", args_size * sizeof(int));
1919 #endif
1920 }
1921
1922 // This method is a copy of JDK's sysGetLastErrorString
1923 // from src/windows/hpi/src/system_md.c
1924
1925 size_t os::lasterror(char* buf, size_t len) {
1926 DWORD errval;
1927
1928 if ((errval = GetLastError()) != 0) {
1929 // DOS error
1930 size_t n = (size_t)FormatMessage(
1931 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1932 NULL,
1933 errval,
1934 0,
1935 buf,
1936 (DWORD)len,
1937 NULL);
1938 if (n > 3) {
1939 // Drop final '.', CR, LF
1940 if (buf[n - 1] == '\n') n--;
1941 if (buf[n - 1] == '\r') n--;
1942 if (buf[n - 1] == '.') n--;
1943 buf[n] = '\0';
1944 }
1945 return n;
1946 }
1947
1948 if (errno != 0) {
1949 // C runtime error that has no corresponding DOS error code
1950 const char* s = os::strerror(errno);
1951 size_t n = strlen(s);
1952 if (n >= len) n = len - 1;
1953 strncpy(buf, s, n);
1954 buf[n] = '\0';
1955 return n;
1956 }
1957
1958 return 0;
1959 }
1960
1961 int os::get_last_error() {
1962 DWORD error = GetLastError();
1963 if (error == 0) {
1964 error = errno;
1965 }
1966 return (int)error;
1967 }
1968
1969 // sun.misc.Signal
1970 // NOTE that this is a workaround for an apparent kernel bug where if
1971 // a signal handler for SIGBREAK is installed then that signal handler
1972 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1973 // See bug 4416763.
1974 static void (*sigbreakHandler)(int) = NULL;
1975
1976 static void UserHandler(int sig, void *siginfo, void *context) {
1977 os::signal_notify(sig);
1978 // We need to reinstate the signal handler each time...
1979 os::signal(sig, (void*)UserHandler);
1980 }
1981
1982 void* os::user_handler() {
1983 return (void*) UserHandler;
1984 }
1985
1986 void* os::signal(int signal_number, void* handler) {
1987 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1988 void (*oldHandler)(int) = sigbreakHandler;
1989 sigbreakHandler = (void (*)(int)) handler;
1990 return (void*) oldHandler;
1991 } else {
1992 return (void*)::signal(signal_number, (void (*)(int))handler);
1993 }
1994 }
1995
1996 void os::signal_raise(int signal_number) {
1997 raise(signal_number);
1998 }
1999
2000 // The Win32 C runtime library maps all console control events other than ^C
2001 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2002 // logoff, and shutdown events. We therefore install our own console handler
2003 // that raises SIGTERM for the latter cases.
2004 //
2005 static BOOL WINAPI consoleHandler(DWORD event) {
2006 switch (event) {
2007 case CTRL_C_EVENT:
2008 if (VMError::is_error_reported()) {
2009 // Ctrl-C is pressed during error reporting, likely because the error
2010 // handler fails to abort. Let VM die immediately.
2011 os::die();
2012 }
2013
2014 os::signal_raise(SIGINT);
2015 return TRUE;
2016 break;
2017 case CTRL_BREAK_EVENT:
2018 if (sigbreakHandler != NULL) {
2019 (*sigbreakHandler)(SIGBREAK);
2020 }
2021 return TRUE;
2022 break;
2023 case CTRL_LOGOFF_EVENT: {
2024 // Don't terminate JVM if it is running in a non-interactive session,
2025 // such as a service process.
2026 USEROBJECTFLAGS flags;
2027 HANDLE handle = GetProcessWindowStation();
2028 if (handle != NULL &&
2029 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2030 sizeof(USEROBJECTFLAGS), NULL)) {
2031 // If it is a non-interactive session, let next handler to deal
2032 // with it.
2033 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2034 return FALSE;
2035 }
2036 }
2037 }
2038 case CTRL_CLOSE_EVENT:
2039 case CTRL_SHUTDOWN_EVENT:
2040 os::signal_raise(SIGTERM);
2041 return TRUE;
2042 break;
2043 default:
2044 break;
2045 }
2046 return FALSE;
2047 }
2048
2049 // The following code is moved from os.cpp for making this
2050 // code platform specific, which it is by its very nature.
2051
2052 // Return maximum OS signal used + 1 for internal use only
2053 // Used as exit signal for signal_thread
2054 int os::sigexitnum_pd() {
2055 return NSIG;
2056 }
2057
2058 // a counter for each possible signal value, including signal_thread exit signal
2059 static volatile jint pending_signals[NSIG+1] = { 0 };
2060 static Semaphore* sig_sem = NULL;
2061
2062 static void jdk_misc_signal_init() {
2063 // Initialize signal structures
2064 memset((void*)pending_signals, 0, sizeof(pending_signals));
2065
2066 // Initialize signal semaphore
2067 sig_sem = new Semaphore();
2068
2069 // Programs embedding the VM do not want it to attempt to receive
2070 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2071 // shutdown hooks mechanism introduced in 1.3. For example, when
2072 // the VM is run as part of a Windows NT service (i.e., a servlet
2073 // engine in a web server), the correct behavior is for any console
2074 // control handler to return FALSE, not TRUE, because the OS's
2075 // "final" handler for such events allows the process to continue if
2076 // it is a service (while terminating it if it is not a service).
2077 // To make this behavior uniform and the mechanism simpler, we
2078 // completely disable the VM's usage of these console events if -Xrs
2079 // (=ReduceSignalUsage) is specified. This means, for example, that
2080 // the CTRL-BREAK thread dump mechanism is also disabled in this
2081 // case. See bugs 4323062, 4345157, and related bugs.
2082
2083 // Add a CTRL-C handler
2084 SetConsoleCtrlHandler(consoleHandler, TRUE);
2085 }
2086
2087 void os::signal_notify(int sig) {
2088 if (sig_sem != NULL) {
2089 Atomic::inc(&pending_signals[sig]);
2090 sig_sem->signal();
2091 } else {
2092 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2093 // initialization isn't called.
2094 assert(ReduceSignalUsage, "signal semaphore should be created");
2095 }
2096 }
2097
2098 static int check_pending_signals() {
2099 while (true) {
2100 for (int i = 0; i < NSIG + 1; i++) {
2101 jint n = pending_signals[i];
2102 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2103 return i;
2104 }
2105 }
2106 JavaThread *thread = JavaThread::current();
2107
2108 ThreadBlockInVM tbivm(thread);
2109
2110 bool threadIsSuspended;
2111 do {
2112 thread->set_suspend_equivalent();
2113 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2114 sig_sem->wait();
2115
2116 // were we externally suspended while we were waiting?
2117 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2118 if (threadIsSuspended) {
2119 // The semaphore has been incremented, but while we were waiting
2120 // another thread suspended us. We don't want to continue running
2121 // while suspended because that would surprise the thread that
2122 // suspended us.
2123 sig_sem->signal();
2124
2125 thread->java_suspend_self();
2126 }
2127 } while (threadIsSuspended);
2128 }
2129 }
2130
2131 int os::signal_wait() {
2132 return check_pending_signals();
2133 }
2134
2135 // Implicit OS exception handling
2136
2137 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2138 address handler) {
2139 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2140 // Save pc in thread
2141 #ifdef _M_AMD64
2142 // Do not blow up if no thread info available.
2143 if (thread) {
2144 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2145 }
2146 // Set pc to handler
2147 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2148 #else
2149 // Do not blow up if no thread info available.
2150 if (thread) {
2151 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2152 }
2153 // Set pc to handler
2154 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2155 #endif
2156
2157 // Continue the execution
2158 return EXCEPTION_CONTINUE_EXECUTION;
2159 }
2160
2161
2162 // Used for PostMortemDump
2163 extern "C" void safepoints();
2164 extern "C" void find(int x);
2165 extern "C" void events();
2166
2167 // According to Windows API documentation, an illegal instruction sequence should generate
2168 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2169 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2170 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2171
2172 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2173
2174 // From "Execution Protection in the Windows Operating System" draft 0.35
2175 // Once a system header becomes available, the "real" define should be
2176 // included or copied here.
2177 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2178
2179 // Windows Vista/2008 heap corruption check
2180 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2181
2182 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2183 // C++ compiler contain this error code. Because this is a compiler-generated
2184 // error, the code is not listed in the Win32 API header files.
2185 // The code is actually a cryptic mnemonic device, with the initial "E"
2186 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2187 // ASCII values of "msc".
2188
2189 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2190
2191 #define def_excpt(val) { #val, (val) }
2192
2193 static const struct { const char* name; uint number; } exceptlabels[] = {
2194 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2195 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2196 def_excpt(EXCEPTION_BREAKPOINT),
2197 def_excpt(EXCEPTION_SINGLE_STEP),
2198 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2199 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2200 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2201 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2202 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2203 def_excpt(EXCEPTION_FLT_OVERFLOW),
2204 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2205 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2206 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2207 def_excpt(EXCEPTION_INT_OVERFLOW),
2208 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2209 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2210 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2211 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2212 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2213 def_excpt(EXCEPTION_STACK_OVERFLOW),
2214 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2215 def_excpt(EXCEPTION_GUARD_PAGE),
2216 def_excpt(EXCEPTION_INVALID_HANDLE),
2217 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2218 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2219 };
2220
2221 #undef def_excpt
2222
2223 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2224 uint code = static_cast<uint>(exception_code);
2225 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2226 if (exceptlabels[i].number == code) {
2227 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2228 return buf;
2229 }
2230 }
2231
2232 return NULL;
2233 }
2234
2235 //-----------------------------------------------------------------------------
2236 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2237 // handle exception caused by idiv; should only happen for -MinInt/-1
2238 // (division by zero is handled explicitly)
2239 #ifdef _M_AMD64
2240 PCONTEXT ctx = exceptionInfo->ContextRecord;
2241 address pc = (address)ctx->Rip;
2242 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2243 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2244 if (pc[0] == 0xF7) {
2245 // set correct result values and continue after idiv instruction
2246 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2247 } else {
2248 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2249 }
2250 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2251 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2252 // idiv opcode (0xF7).
2253 ctx->Rdx = (DWORD)0; // remainder
2254 // Continue the execution
2255 #else
2256 PCONTEXT ctx = exceptionInfo->ContextRecord;
2257 address pc = (address)ctx->Eip;
2258 assert(pc[0] == 0xF7, "not an idiv opcode");
2259 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2260 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2261 // set correct result values and continue after idiv instruction
2262 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2263 ctx->Eax = (DWORD)min_jint; // result
2264 ctx->Edx = (DWORD)0; // remainder
2265 // Continue the execution
2266 #endif
2267 return EXCEPTION_CONTINUE_EXECUTION;
2268 }
2269
2270 //-----------------------------------------------------------------------------
2271 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2272 PCONTEXT ctx = exceptionInfo->ContextRecord;
2273 #ifndef _WIN64
2274 // handle exception caused by native method modifying control word
2275 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2276
2277 switch (exception_code) {
2278 case EXCEPTION_FLT_DENORMAL_OPERAND:
2279 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2280 case EXCEPTION_FLT_INEXACT_RESULT:
2281 case EXCEPTION_FLT_INVALID_OPERATION:
2282 case EXCEPTION_FLT_OVERFLOW:
2283 case EXCEPTION_FLT_STACK_CHECK:
2284 case EXCEPTION_FLT_UNDERFLOW:
2285 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2286 if (fp_control_word != ctx->FloatSave.ControlWord) {
2287 // Restore FPCW and mask out FLT exceptions
2288 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2289 // Mask out pending FLT exceptions
2290 ctx->FloatSave.StatusWord &= 0xffffff00;
2291 return EXCEPTION_CONTINUE_EXECUTION;
2292 }
2293 }
2294
2295 if (prev_uef_handler != NULL) {
2296 // We didn't handle this exception so pass it to the previous
2297 // UnhandledExceptionFilter.
2298 return (prev_uef_handler)(exceptionInfo);
2299 }
2300 #else // !_WIN64
2301 // On Windows, the mxcsr control bits are non-volatile across calls
2302 // See also CR 6192333
2303 //
2304 jint MxCsr = INITIAL_MXCSR;
2305 // we can't use StubRoutines::addr_mxcsr_std()
2306 // because in Win64 mxcsr is not saved there
2307 if (MxCsr != ctx->MxCsr) {
2308 ctx->MxCsr = MxCsr;
2309 return EXCEPTION_CONTINUE_EXECUTION;
2310 }
2311 #endif // !_WIN64
2312
2313 return EXCEPTION_CONTINUE_SEARCH;
2314 }
2315
2316 static inline void report_error(Thread* t, DWORD exception_code,
2317 address addr, void* siginfo, void* context) {
2318 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2319
2320 // If UseOsErrorReporting, this will return here and save the error file
2321 // somewhere where we can find it in the minidump.
2322 }
2323
2324 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2325 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2326 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2327 address addr = (address) exceptionRecord->ExceptionInformation[1];
2328 if (Interpreter::contains(pc)) {
2329 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2330 if (!fr->is_first_java_frame()) {
2331 // get_frame_at_stack_banging_point() is only called when we
2332 // have well defined stacks so java_sender() calls do not need
2333 // to assert safe_for_sender() first.
2334 *fr = fr->java_sender();
2335 }
2336 } else {
2337 // more complex code with compiled code
2338 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2339 CodeBlob* cb = CodeCache::find_blob(pc);
2340 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2341 // Not sure where the pc points to, fallback to default
2342 // stack overflow handling
2343 return false;
2344 } else {
2345 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2346 // in compiled code, the stack banging is performed just after the return pc
2347 // has been pushed on the stack
2348 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2349 if (!fr->is_java_frame()) {
2350 // See java_sender() comment above.
2351 *fr = fr->java_sender();
2352 }
2353 }
2354 }
2355 assert(fr->is_java_frame(), "Safety check");
2356 return true;
2357 }
2358
2359 #if INCLUDE_AOT
2360 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2361 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2362 address addr = (address) exceptionRecord->ExceptionInformation[1];
2363 address pc = (address) exceptionInfo->ContextRecord->Rip;
2364
2365 // Handle the case where we get an implicit exception in AOT generated
2366 // code. AOT DLL's loaded are not registered for structured exceptions.
2367 // If the exception occurred in the codeCache or AOT code, pass control
2368 // to our normal exception handler.
2369 CodeBlob* cb = CodeCache::find_blob(pc);
2370 if (cb != NULL) {
2371 return topLevelExceptionFilter(exceptionInfo);
2372 }
2373
2374 return EXCEPTION_CONTINUE_SEARCH;
2375 }
2376 #endif
2377
2378 //-----------------------------------------------------------------------------
2379 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2380 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2381 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2382 #ifdef _M_AMD64
2383 address pc = (address) exceptionInfo->ContextRecord->Rip;
2384 #else
2385 address pc = (address) exceptionInfo->ContextRecord->Eip;
2386 #endif
2387 Thread* t = Thread::current_or_null_safe();
2388
2389 // Handle SafeFetch32 and SafeFetchN exceptions.
2390 if (StubRoutines::is_safefetch_fault(pc)) {
2391 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2392 }
2393
2394 #ifndef _WIN64
2395 // Execution protection violation - win32 running on AMD64 only
2396 // Handled first to avoid misdiagnosis as a "normal" access violation;
2397 // This is safe to do because we have a new/unique ExceptionInformation
2398 // code for this condition.
2399 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2400 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2401 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2402 address addr = (address) exceptionRecord->ExceptionInformation[1];
2403
2404 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2405 int page_size = os::vm_page_size();
2406
2407 // Make sure the pc and the faulting address are sane.
2408 //
2409 // If an instruction spans a page boundary, and the page containing
2410 // the beginning of the instruction is executable but the following
2411 // page is not, the pc and the faulting address might be slightly
2412 // different - we still want to unguard the 2nd page in this case.
2413 //
2414 // 15 bytes seems to be a (very) safe value for max instruction size.
2415 bool pc_is_near_addr =
2416 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2417 bool instr_spans_page_boundary =
2418 (align_down((intptr_t) pc ^ (intptr_t) addr,
2419 (intptr_t) page_size) > 0);
2420
2421 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2422 static volatile address last_addr =
2423 (address) os::non_memory_address_word();
2424
2425 // In conservative mode, don't unguard unless the address is in the VM
2426 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2427 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2428
2429 // Set memory to RWX and retry
2430 address page_start = align_down(addr, page_size);
2431 bool res = os::protect_memory((char*) page_start, page_size,
2432 os::MEM_PROT_RWX);
2433
2434 log_debug(os)("Execution protection violation "
2435 "at " INTPTR_FORMAT
2436 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2437 p2i(page_start), (res ? "success" : os::strerror(errno)));
2438
2439 // Set last_addr so if we fault again at the same address, we don't
2440 // end up in an endless loop.
2441 //
2442 // There are two potential complications here. Two threads trapping
2443 // at the same address at the same time could cause one of the
2444 // threads to think it already unguarded, and abort the VM. Likely
2445 // very rare.
2446 //
2447 // The other race involves two threads alternately trapping at
2448 // different addresses and failing to unguard the page, resulting in
2449 // an endless loop. This condition is probably even more unlikely
2450 // than the first.
2451 //
2452 // Although both cases could be avoided by using locks or thread
2453 // local last_addr, these solutions are unnecessary complication:
2454 // this handler is a best-effort safety net, not a complete solution.
2455 // It is disabled by default and should only be used as a workaround
2456 // in case we missed any no-execute-unsafe VM code.
2457
2458 last_addr = addr;
2459
2460 return EXCEPTION_CONTINUE_EXECUTION;
2461 }
2462 }
2463
2464 // Last unguard failed or not unguarding
2465 tty->print_raw_cr("Execution protection violation");
2466 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2467 exceptionInfo->ContextRecord);
2468 return EXCEPTION_CONTINUE_SEARCH;
2469 }
2470 }
2471 #endif // _WIN64
2472
2473 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2474 VM_Version::is_cpuinfo_segv_addr(pc)) {
2475 // Verify that OS save/restore AVX registers.
2476 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2477 }
2478
2479 if (t != NULL && t->is_Java_thread()) {
2480 JavaThread* thread = (JavaThread*) t;
2481 bool in_java = thread->thread_state() == _thread_in_Java;
2482
2483 // Handle potential stack overflows up front.
2484 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2485 if (thread->stack_guards_enabled()) {
2486 if (in_java) {
2487 frame fr;
2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2489 address addr = (address) exceptionRecord->ExceptionInformation[1];
2490 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2491 assert(fr.is_java_frame(), "Must be a Java frame");
2492 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2493 }
2494 }
2495 // Yellow zone violation. The o/s has unprotected the first yellow
2496 // zone page for us. Note: must call disable_stack_yellow_zone to
2497 // update the enabled status, even if the zone contains only one page.
2498 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2499 thread->disable_stack_yellow_reserved_zone();
2500 // If not in java code, return and hope for the best.
2501 return in_java
2502 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2503 : EXCEPTION_CONTINUE_EXECUTION;
2504 } else {
2505 // Fatal red zone violation.
2506 thread->disable_stack_red_zone();
2507 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2508 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2509 exceptionInfo->ContextRecord);
2510 return EXCEPTION_CONTINUE_SEARCH;
2511 }
2512 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2513 // Either stack overflow or null pointer exception.
2514 if (in_java) {
2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2516 address addr = (address) exceptionRecord->ExceptionInformation[1];
2517 address stack_end = thread->stack_end();
2518 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2519 // Stack overflow.
2520 assert(!os::uses_stack_guard_pages(),
2521 "should be caught by red zone code above.");
2522 return Handle_Exception(exceptionInfo,
2523 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2524 }
2525 // Check for safepoint polling and implicit null
2526 // We only expect null pointers in the stubs (vtable)
2527 // the rest are checked explicitly now.
2528 CodeBlob* cb = CodeCache::find_blob(pc);
2529 if (cb != NULL) {
2530 if (os::is_poll_address(addr)) {
2531 address stub = SharedRuntime::get_poll_stub(pc);
2532 return Handle_Exception(exceptionInfo, stub);
2533 }
2534 }
2535 {
2536 #ifdef _WIN64
2537 // If it's a legal stack address map the entire region in
2538 //
2539 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2540 address addr = (address) exceptionRecord->ExceptionInformation[1];
2541 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2542 addr = (address)((uintptr_t)addr &
2543 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2544 os::commit_memory((char *)addr, thread->stack_base() - addr,
2545 !ExecMem);
2546 return EXCEPTION_CONTINUE_EXECUTION;
2547 } else
2548 #endif
2549 {
2550 // Null pointer exception.
2551 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2552 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2553 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2554 }
2555 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2556 exceptionInfo->ContextRecord);
2557 return EXCEPTION_CONTINUE_SEARCH;
2558 }
2559 }
2560 }
2561
2562 #ifdef _WIN64
2563 // Special care for fast JNI field accessors.
2564 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2565 // in and the heap gets shrunk before the field access.
2566 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2567 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2568 if (addr != (address)-1) {
2569 return Handle_Exception(exceptionInfo, addr);
2570 }
2571 }
2572 #endif
2573
2574 // Stack overflow or null pointer exception in native code.
2575 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2576 exceptionInfo->ContextRecord);
2577 return EXCEPTION_CONTINUE_SEARCH;
2578 } // /EXCEPTION_ACCESS_VIOLATION
2579 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2580
2581 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2582 CompiledMethod* nm = NULL;
2583 JavaThread* thread = (JavaThread*)t;
2584 if (in_java) {
2585 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2586 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2587 }
2588
2589 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2590 if (((thread->thread_state() == _thread_in_vm ||
2591 thread->thread_state() == _thread_in_native ||
2592 is_unsafe_arraycopy) &&
2593 thread->doing_unsafe_access()) ||
2594 (nm != NULL && nm->has_unsafe_access())) {
2595 address next_pc = Assembler::locate_next_instruction(pc);
2596 if (is_unsafe_arraycopy) {
2597 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2598 }
2599 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2600 }
2601 }
2602
2603 if (in_java) {
2604 switch (exception_code) {
2605 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2606 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2607
2608 case EXCEPTION_INT_OVERFLOW:
2609 return Handle_IDiv_Exception(exceptionInfo);
2610
2611 } // switch
2612 }
2613 if (((thread->thread_state() == _thread_in_Java) ||
2614 (thread->thread_state() == _thread_in_native)) &&
2615 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2616 LONG result=Handle_FLT_Exception(exceptionInfo);
2617 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2618 }
2619 }
2620
2621 if (exception_code != EXCEPTION_BREAKPOINT) {
2622 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2623 exceptionInfo->ContextRecord);
2624 }
2625 return EXCEPTION_CONTINUE_SEARCH;
2626 }
2627
2628 #ifndef _WIN64
2629 // Special care for fast JNI accessors.
2630 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2631 // the heap gets shrunk before the field access.
2632 // Need to install our own structured exception handler since native code may
2633 // install its own.
2634 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2635 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2636 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2637 address pc = (address) exceptionInfo->ContextRecord->Eip;
2638 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2639 if (addr != (address)-1) {
2640 return Handle_Exception(exceptionInfo, addr);
2641 }
2642 }
2643 return EXCEPTION_CONTINUE_SEARCH;
2644 }
2645
2646 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2647 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2648 jobject obj, \
2649 jfieldID fieldID) { \
2650 __try { \
2651 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2652 obj, \
2653 fieldID); \
2654 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2655 _exception_info())) { \
2656 } \
2657 return 0; \
2658 }
2659
2660 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2661 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2662 DEFINE_FAST_GETFIELD(jchar, char, Char)
2663 DEFINE_FAST_GETFIELD(jshort, short, Short)
2664 DEFINE_FAST_GETFIELD(jint, int, Int)
2665 DEFINE_FAST_GETFIELD(jlong, long, Long)
2666 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2667 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2668
2669 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2670 switch (type) {
2671 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2672 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2673 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2674 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2675 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2676 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2677 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2678 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2679 default: ShouldNotReachHere();
2680 }
2681 return (address)-1;
2682 }
2683 #endif
2684
2685 // Virtual Memory
2686
2687 int os::vm_page_size() { return os::win32::vm_page_size(); }
2688 int os::vm_allocation_granularity() {
2689 return os::win32::vm_allocation_granularity();
2690 }
2691
2692 // Windows large page support is available on Windows 2003. In order to use
2693 // large page memory, the administrator must first assign additional privilege
2694 // to the user:
2695 // + select Control Panel -> Administrative Tools -> Local Security Policy
2696 // + select Local Policies -> User Rights Assignment
2697 // + double click "Lock pages in memory", add users and/or groups
2698 // + reboot
2699 // Note the above steps are needed for administrator as well, as administrators
2700 // by default do not have the privilege to lock pages in memory.
2701 //
2702 // Note about Windows 2003: although the API supports committing large page
2703 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2704 // scenario, I found through experiment it only uses large page if the entire
2705 // memory region is reserved and committed in a single VirtualAlloc() call.
2706 // This makes Windows large page support more or less like Solaris ISM, in
2707 // that the entire heap must be committed upfront. This probably will change
2708 // in the future, if so the code below needs to be revisited.
2709
2710 #ifndef MEM_LARGE_PAGES
2711 #define MEM_LARGE_PAGES 0x20000000
2712 #endif
2713
2714 static HANDLE _hProcess;
2715 static HANDLE _hToken;
2716
2717 // Container for NUMA node list info
2718 class NUMANodeListHolder {
2719 private:
2720 int *_numa_used_node_list; // allocated below
2721 int _numa_used_node_count;
2722
2723 void free_node_list() {
2724 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2725 }
2726
2727 public:
2728 NUMANodeListHolder() {
2729 _numa_used_node_count = 0;
2730 _numa_used_node_list = NULL;
2731 // do rest of initialization in build routine (after function pointers are set up)
2732 }
2733
2734 ~NUMANodeListHolder() {
2735 free_node_list();
2736 }
2737
2738 bool build() {
2739 DWORD_PTR proc_aff_mask;
2740 DWORD_PTR sys_aff_mask;
2741 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2742 ULONG highest_node_number;
2743 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2744 free_node_list();
2745 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2746 for (unsigned int i = 0; i <= highest_node_number; i++) {
2747 ULONGLONG proc_mask_numa_node;
2748 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2749 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2750 _numa_used_node_list[_numa_used_node_count++] = i;
2751 }
2752 }
2753 return (_numa_used_node_count > 1);
2754 }
2755
2756 int get_count() { return _numa_used_node_count; }
2757 int get_node_list_entry(int n) {
2758 // for indexes out of range, returns -1
2759 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2760 }
2761
2762 } numa_node_list_holder;
2763
2764
2765
2766 static size_t _large_page_size = 0;
2767
2768 static bool request_lock_memory_privilege() {
2769 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2770 os::current_process_id());
2771
2772 LUID luid;
2773 if (_hProcess != NULL &&
2774 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2775 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2776
2777 TOKEN_PRIVILEGES tp;
2778 tp.PrivilegeCount = 1;
2779 tp.Privileges[0].Luid = luid;
2780 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2781
2782 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2783 // privilege. Check GetLastError() too. See MSDN document.
2784 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2785 (GetLastError() == ERROR_SUCCESS)) {
2786 return true;
2787 }
2788 }
2789
2790 return false;
2791 }
2792
2793 static void cleanup_after_large_page_init() {
2794 if (_hProcess) CloseHandle(_hProcess);
2795 _hProcess = NULL;
2796 if (_hToken) CloseHandle(_hToken);
2797 _hToken = NULL;
2798 }
2799
2800 static bool numa_interleaving_init() {
2801 bool success = false;
2802 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2803
2804 // print a warning if UseNUMAInterleaving flag is specified on command line
2805 bool warn_on_failure = use_numa_interleaving_specified;
2806 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2807
2808 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2809 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2810 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2811
2812 if (numa_node_list_holder.build()) {
2813 if (log_is_enabled(Debug, os, cpu)) {
2814 Log(os, cpu) log;
2815 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2816 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2817 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2818 }
2819 }
2820 success = true;
2821 } else {
2822 WARN("Process does not cover multiple NUMA nodes.");
2823 }
2824 if (!success) {
2825 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2826 }
2827 return success;
2828 #undef WARN
2829 }
2830
2831 // this routine is used whenever we need to reserve a contiguous VA range
2832 // but we need to make separate VirtualAlloc calls for each piece of the range
2833 // Reasons for doing this:
2834 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2835 // * UseNUMAInterleaving requires a separate node for each piece
2836 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2837 DWORD prot,
2838 bool should_inject_error = false) {
2839 char * p_buf;
2840 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2841 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2842 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2843
2844 // first reserve enough address space in advance since we want to be
2845 // able to break a single contiguous virtual address range into multiple
2846 // large page commits but WS2003 does not allow reserving large page space
2847 // so we just use 4K pages for reserve, this gives us a legal contiguous
2848 // address space. then we will deallocate that reservation, and re alloc
2849 // using large pages
2850 const size_t size_of_reserve = bytes + chunk_size;
2851 if (bytes > size_of_reserve) {
2852 // Overflowed.
2853 return NULL;
2854 }
2855 p_buf = (char *) VirtualAlloc(addr,
2856 size_of_reserve, // size of Reserve
2857 MEM_RESERVE,
2858 PAGE_READWRITE);
2859 // If reservation failed, return NULL
2860 if (p_buf == NULL) return NULL;
2861 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2862 os::release_memory(p_buf, bytes + chunk_size);
2863
2864 // we still need to round up to a page boundary (in case we are using large pages)
2865 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2866 // instead we handle this in the bytes_to_rq computation below
2867 p_buf = align_up(p_buf, page_size);
2868
2869 // now go through and allocate one chunk at a time until all bytes are
2870 // allocated
2871 size_t bytes_remaining = bytes;
2872 // An overflow of align_up() would have been caught above
2873 // in the calculation of size_of_reserve.
2874 char * next_alloc_addr = p_buf;
2875 HANDLE hProc = GetCurrentProcess();
2876
2877 #ifdef ASSERT
2878 // Variable for the failure injection
2879 int ran_num = os::random();
2880 size_t fail_after = ran_num % bytes;
2881 #endif
2882
2883 int count=0;
2884 while (bytes_remaining) {
2885 // select bytes_to_rq to get to the next chunk_size boundary
2886
2887 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2888 // Note allocate and commit
2889 char * p_new;
2890
2891 #ifdef ASSERT
2892 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2893 #else
2894 const bool inject_error_now = false;
2895 #endif
2896
2897 if (inject_error_now) {
2898 p_new = NULL;
2899 } else {
2900 if (!UseNUMAInterleaving) {
2901 p_new = (char *) VirtualAlloc(next_alloc_addr,
2902 bytes_to_rq,
2903 flags,
2904 prot);
2905 } else {
2906 // get the next node to use from the used_node_list
2907 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2908 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2909 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2910 }
2911 }
2912
2913 if (p_new == NULL) {
2914 // Free any allocated pages
2915 if (next_alloc_addr > p_buf) {
2916 // Some memory was committed so release it.
2917 size_t bytes_to_release = bytes - bytes_remaining;
2918 // NMT has yet to record any individual blocks, so it
2919 // need to create a dummy 'reserve' record to match
2920 // the release.
2921 MemTracker::record_virtual_memory_reserve((address)p_buf,
2922 bytes_to_release, CALLER_PC);
2923 os::release_memory(p_buf, bytes_to_release);
2924 }
2925 #ifdef ASSERT
2926 if (should_inject_error) {
2927 log_develop_debug(pagesize)("Reserving pages individually failed.");
2928 }
2929 #endif
2930 return NULL;
2931 }
2932
2933 bytes_remaining -= bytes_to_rq;
2934 next_alloc_addr += bytes_to_rq;
2935 count++;
2936 }
2937 // Although the memory is allocated individually, it is returned as one.
2938 // NMT records it as one block.
2939 if ((flags & MEM_COMMIT) != 0) {
2940 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2941 } else {
2942 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2943 }
2944
2945 // made it this far, success
2946 return p_buf;
2947 }
2948
2949
2950
2951 void os::large_page_init() {
2952 if (!UseLargePages) return;
2953
2954 // print a warning if any large page related flag is specified on command line
2955 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2956 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2957 bool success = false;
2958
2959 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2960 if (request_lock_memory_privilege()) {
2961 size_t s = GetLargePageMinimum();
2962 if (s) {
2963 #if defined(IA32) || defined(AMD64)
2964 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2965 WARN("JVM cannot use large pages bigger than 4mb.");
2966 } else {
2967 #endif
2968 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2969 _large_page_size = LargePageSizeInBytes;
2970 } else {
2971 _large_page_size = s;
2972 }
2973 success = true;
2974 #if defined(IA32) || defined(AMD64)
2975 }
2976 #endif
2977 } else {
2978 WARN("Large page is not supported by the processor.");
2979 }
2980 } else {
2981 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2982 }
2983 #undef WARN
2984
2985 const size_t default_page_size = (size_t) vm_page_size();
2986 if (success && _large_page_size > default_page_size) {
2987 _page_sizes[0] = _large_page_size;
2988 _page_sizes[1] = default_page_size;
2989 _page_sizes[2] = 0;
2990 }
2991
2992 cleanup_after_large_page_init();
2993 UseLargePages = success;
2994 }
2995
2996 int os::create_file_for_heap(const char* dir) {
2997
2998 const char name_template[] = "/jvmheap.XXXXXX";
2999
3000 size_t fullname_len = strlen(dir) + strlen(name_template);
3001 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3002 if (fullname == NULL) {
3003 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3004 return -1;
3005 }
3006 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3007 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3008
3009 os::native_path(fullname);
3010
3011 char *path = _mktemp(fullname);
3012 if (path == NULL) {
3013 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3014 os::free(fullname);
3015 return -1;
3016 }
3017
3018 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3019
3020 os::free(fullname);
3021 if (fd < 0) {
3022 warning("Problem opening file for heap (%s)", os::strerror(errno));
3023 return -1;
3024 }
3025 return fd;
3026 }
3027
3028 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3029 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3030 assert(fd != -1, "File descriptor is not valid");
3031
3032 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3033 #ifdef _LP64
3034 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3035 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3036 #else
3037 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3038 0, (DWORD)size, NULL);
3039 #endif
3040 if (fileMapping == NULL) {
3041 if (GetLastError() == ERROR_DISK_FULL) {
3042 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3043 }
3044 else {
3045 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3046 }
3047
3048 return NULL;
3049 }
3050
3051 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3052
3053 CloseHandle(fileMapping);
3054
3055 return (char*)addr;
3056 }
3057
3058 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3059 assert(fd != -1, "File descriptor is not valid");
3060 assert(base != NULL, "Base address cannot be NULL");
3061
3062 release_memory(base, size);
3063 return map_memory_to_file(base, size, fd);
3064 }
3065
3066 // On win32, one cannot release just a part of reserved memory, it's an
3067 // all or nothing deal. When we split a reservation, we must break the
3068 // reservation into two reservations.
3069 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3070 bool realloc) {
3071 if (size > 0) {
3072 release_memory(base, size);
3073 if (realloc) {
3074 reserve_memory(split, base);
3075 }
3076 if (size != split) {
3077 reserve_memory(size - split, base + split);
3078 }
3079 }
3080 }
3081
3082 // Multiple threads can race in this code but it's not possible to unmap small sections of
3083 // virtual space to get requested alignment, like posix-like os's.
3084 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3085 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3086 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3087 "Alignment must be a multiple of allocation granularity (page size)");
3088 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3089
3090 size_t extra_size = size + alignment;
3091 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3092
3093 char* aligned_base = NULL;
3094
3095 do {
3096 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3097 if (extra_base == NULL) {
3098 return NULL;
3099 }
3100 // Do manual alignment
3101 aligned_base = align_up(extra_base, alignment);
3102
3103 if (file_desc != -1) {
3104 os::unmap_memory(extra_base, extra_size);
3105 } else {
3106 os::release_memory(extra_base, extra_size);
3107 }
3108
3109 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3110
3111 } while (aligned_base == NULL);
3112
3113 return aligned_base;
3114 }
3115
3116 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3117 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3118 "reserve alignment");
3119 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3120 char* res;
3121 // note that if UseLargePages is on, all the areas that require interleaving
3122 // will go thru reserve_memory_special rather than thru here.
3123 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3124 if (!use_individual) {
3125 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3126 } else {
3127 elapsedTimer reserveTimer;
3128 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3129 // in numa interleaving, we have to allocate pages individually
3130 // (well really chunks of NUMAInterleaveGranularity size)
3131 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3132 if (res == NULL) {
3133 warning("NUMA page allocation failed");
3134 }
3135 if (Verbose && PrintMiscellaneous) {
3136 reserveTimer.stop();
3137 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3138 reserveTimer.milliseconds(), reserveTimer.ticks());
3139 }
3140 }
3141 assert(res == NULL || addr == NULL || addr == res,
3142 "Unexpected address from reserve.");
3143
3144 return res;
3145 }
3146
3147 // Reserve memory at an arbitrary address, only if that area is
3148 // available (and not reserved for something else).
3149 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3150 // Windows os::reserve_memory() fails of the requested address range is
3151 // not avilable.
3152 return reserve_memory(bytes, requested_addr);
3153 }
3154
3155 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3156 assert(file_desc >= 0, "file_desc is not valid");
3157 return map_memory_to_file(requested_addr, bytes, file_desc);
3158 }
3159
3160 size_t os::large_page_size() {
3161 return _large_page_size;
3162 }
3163
3164 bool os::can_commit_large_page_memory() {
3165 // Windows only uses large page memory when the entire region is reserved
3166 // and committed in a single VirtualAlloc() call. This may change in the
3167 // future, but with Windows 2003 it's not possible to commit on demand.
3168 return false;
3169 }
3170
3171 bool os::can_execute_large_page_memory() {
3172 return true;
3173 }
3174
3175 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3176 bool exec) {
3177 assert(UseLargePages, "only for large pages");
3178
3179 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3180 return NULL; // Fallback to small pages.
3181 }
3182
3183 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3184 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3185
3186 // with large pages, there are two cases where we need to use Individual Allocation
3187 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3188 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3189 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3190 log_debug(pagesize)("Reserving large pages individually.");
3191
3192 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3193 if (p_buf == NULL) {
3194 // give an appropriate warning message
3195 if (UseNUMAInterleaving) {
3196 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3197 }
3198 if (UseLargePagesIndividualAllocation) {
3199 warning("Individually allocated large pages failed, "
3200 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3201 }
3202 return NULL;
3203 }
3204
3205 return p_buf;
3206
3207 } else {
3208 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3209
3210 // normal policy just allocate it all at once
3211 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3212 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3213 if (res != NULL) {
3214 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3215 }
3216
3217 return res;
3218 }
3219 }
3220
3221 bool os::release_memory_special(char* base, size_t bytes) {
3222 assert(base != NULL, "Sanity check");
3223 return release_memory(base, bytes);
3224 }
3225
3226 void os::print_statistics() {
3227 }
3228
3229 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3230 int err = os::get_last_error();
3231 char buf[256];
3232 size_t buf_len = os::lasterror(buf, sizeof(buf));
3233 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3234 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3235 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3236 }
3237
3238 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3239 if (bytes == 0) {
3240 // Don't bother the OS with noops.
3241 return true;
3242 }
3243 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3244 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3245 // Don't attempt to print anything if the OS call fails. We're
3246 // probably low on resources, so the print itself may cause crashes.
3247
3248 // unless we have NUMAInterleaving enabled, the range of a commit
3249 // is always within a reserve covered by a single VirtualAlloc
3250 // in that case we can just do a single commit for the requested size
3251 if (!UseNUMAInterleaving) {
3252 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3253 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3254 return false;
3255 }
3256 if (exec) {
3257 DWORD oldprot;
3258 // Windows doc says to use VirtualProtect to get execute permissions
3259 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3260 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3261 return false;
3262 }
3263 }
3264 return true;
3265 } else {
3266
3267 // when NUMAInterleaving is enabled, the commit might cover a range that
3268 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3269 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3270 // returns represents the number of bytes that can be committed in one step.
3271 size_t bytes_remaining = bytes;
3272 char * next_alloc_addr = addr;
3273 while (bytes_remaining > 0) {
3274 MEMORY_BASIC_INFORMATION alloc_info;
3275 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3276 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3277 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3278 PAGE_READWRITE) == NULL) {
3279 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3280 exec);)
3281 return false;
3282 }
3283 if (exec) {
3284 DWORD oldprot;
3285 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3286 PAGE_EXECUTE_READWRITE, &oldprot)) {
3287 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3288 exec);)
3289 return false;
3290 }
3291 }
3292 bytes_remaining -= bytes_to_rq;
3293 next_alloc_addr += bytes_to_rq;
3294 }
3295 }
3296 // if we made it this far, return true
3297 return true;
3298 }
3299
3300 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3301 bool exec) {
3302 // alignment_hint is ignored on this OS
3303 return pd_commit_memory(addr, size, exec);
3304 }
3305
3306 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3307 const char* mesg) {
3308 assert(mesg != NULL, "mesg must be specified");
3309 if (!pd_commit_memory(addr, size, exec)) {
3310 warn_fail_commit_memory(addr, size, exec);
3311 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3312 }
3313 }
3314
3315 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3316 size_t alignment_hint, bool exec,
3317 const char* mesg) {
3318 // alignment_hint is ignored on this OS
3319 pd_commit_memory_or_exit(addr, size, exec, mesg);
3320 }
3321
3322 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3323 if (bytes == 0) {
3324 // Don't bother the OS with noops.
3325 return true;
3326 }
3327 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3328 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3329 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3330 }
3331
3332 bool os::pd_release_memory(char* addr, size_t bytes) {
3333 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3334 }
3335
3336 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3337 return os::commit_memory(addr, size, !ExecMem);
3338 }
3339
3340 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3341 return os::uncommit_memory(addr, size);
3342 }
3343
3344 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3345 uint count = 0;
3346 bool ret = false;
3347 size_t bytes_remaining = bytes;
3348 char * next_protect_addr = addr;
3349
3350 // Use VirtualQuery() to get the chunk size.
3351 while (bytes_remaining) {
3352 MEMORY_BASIC_INFORMATION alloc_info;
3353 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3354 return false;
3355 }
3356
3357 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3358 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3359 // but we don't distinguish here as both cases are protected by same API.
3360 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3361 warning("Failed protecting pages individually for chunk #%u", count);
3362 if (!ret) {
3363 return false;
3364 }
3365
3366 bytes_remaining -= bytes_to_protect;
3367 next_protect_addr += bytes_to_protect;
3368 count++;
3369 }
3370 return ret;
3371 }
3372
3373 // Set protections specified
3374 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3375 bool is_committed) {
3376 unsigned int p = 0;
3377 switch (prot) {
3378 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3379 case MEM_PROT_READ: p = PAGE_READONLY; break;
3380 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3381 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3382 default:
3383 ShouldNotReachHere();
3384 }
3385
3386 DWORD old_status;
3387
3388 // Strange enough, but on Win32 one can change protection only for committed
3389 // memory, not a big deal anyway, as bytes less or equal than 64K
3390 if (!is_committed) {
3391 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3392 "cannot commit protection page");
3393 }
3394 // One cannot use os::guard_memory() here, as on Win32 guard page
3395 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3396 //
3397 // Pages in the region become guard pages. Any attempt to access a guard page
3398 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3399 // the guard page status. Guard pages thus act as a one-time access alarm.
3400 bool ret;
3401 if (UseNUMAInterleaving) {
3402 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3403 // so we must protect the chunks individually.
3404 ret = protect_pages_individually(addr, bytes, p, &old_status);
3405 } else {
3406 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3407 }
3408 #ifdef ASSERT
3409 if (!ret) {
3410 int err = os::get_last_error();
3411 char buf[256];
3412 size_t buf_len = os::lasterror(buf, sizeof(buf));
3413 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3414 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3415 buf_len != 0 ? buf : "<no_error_string>", err);
3416 }
3417 #endif
3418 return ret;
3419 }
3420
3421 bool os::guard_memory(char* addr, size_t bytes) {
3422 DWORD old_status;
3423 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3424 }
3425
3426 bool os::unguard_memory(char* addr, size_t bytes) {
3427 DWORD old_status;
3428 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3429 }
3430
3431 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3432 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3433 void os::numa_make_global(char *addr, size_t bytes) { }
3434 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3435 bool os::numa_topology_changed() { return false; }
3436 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3437 int os::numa_get_group_id() { return 0; }
3438 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3439 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3440 // Provide an answer for UMA systems
3441 ids[0] = 0;
3442 return 1;
3443 } else {
3444 // check for size bigger than actual groups_num
3445 size = MIN2(size, numa_get_groups_num());
3446 for (int i = 0; i < (int)size; i++) {
3447 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3448 }
3449 return size;
3450 }
3451 }
3452
3453 int os::numa_get_address_id(uintptr_t addr) { return 0; }
3454
3455 bool os::get_page_info(char *start, page_info* info) {
3456 return false;
3457 }
3458
3459 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3460 page_info* page_found) {
3461 return end;
3462 }
3463
3464 char* os::non_memory_address_word() {
3465 // Must never look like an address returned by reserve_memory,
3466 // even in its subfields (as defined by the CPU immediate fields,
3467 // if the CPU splits constants across multiple instructions).
3468 return (char*)-1;
3469 }
3470
3471 #define MAX_ERROR_COUNT 100
3472 #define SYS_THREAD_ERROR 0xffffffffUL
3473
3474 void os::pd_start_thread(Thread* thread) {
3475 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3476 // Returns previous suspend state:
3477 // 0: Thread was not suspended
3478 // 1: Thread is running now
3479 // >1: Thread is still suspended.
3480 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3481 }
3482
3483
3484 // Short sleep, direct OS call.
3485 //
3486 // ms = 0, means allow others (if any) to run.
3487 //
3488 void os::naked_short_sleep(jlong ms) {
3489 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3490 Sleep(ms);
3491 }
3492
3493 // Windows does not provide sleep functionality with nanosecond resolution, so we
3494 // try to approximate this with spinning combined with yielding if another thread
3495 // is ready to run on the current processor.
3496 void os::naked_short_nanosleep(jlong ns) {
3497 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3498
3499 int64_t start = os::javaTimeNanos();
3500 do {
3501 if (SwitchToThread() == 0) {
3502 // Nothing else is ready to run on this cpu, spin a little
3503 SpinPause();
3504 }
3505 } while (os::javaTimeNanos() - start < ns);
3506 }
3507
3508 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3509 void os::infinite_sleep() {
3510 while (true) { // sleep forever ...
3511 Sleep(100000); // ... 100 seconds at a time
3512 }
3513 }
3514
3515 typedef BOOL (WINAPI * STTSignature)(void);
3516
3517 void os::naked_yield() {
3518 // Consider passing back the return value from SwitchToThread().
3519 SwitchToThread();
3520 }
3521
3522 // Win32 only gives you access to seven real priorities at a time,
3523 // so we compress Java's ten down to seven. It would be better
3524 // if we dynamically adjusted relative priorities.
3525
3526 int os::java_to_os_priority[CriticalPriority + 1] = {
3527 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3528 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3529 THREAD_PRIORITY_LOWEST, // 2
3530 THREAD_PRIORITY_BELOW_NORMAL, // 3
3531 THREAD_PRIORITY_BELOW_NORMAL, // 4
3532 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3533 THREAD_PRIORITY_NORMAL, // 6
3534 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3535 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3536 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3537 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3538 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3539 };
3540
3541 int prio_policy1[CriticalPriority + 1] = {
3542 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3543 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3544 THREAD_PRIORITY_LOWEST, // 2
3545 THREAD_PRIORITY_BELOW_NORMAL, // 3
3546 THREAD_PRIORITY_BELOW_NORMAL, // 4
3547 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3548 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3549 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3550 THREAD_PRIORITY_HIGHEST, // 8
3551 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3552 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3553 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3554 };
3555
3556 static int prio_init() {
3557 // If ThreadPriorityPolicy is 1, switch tables
3558 if (ThreadPriorityPolicy == 1) {
3559 int i;
3560 for (i = 0; i < CriticalPriority + 1; i++) {
3561 os::java_to_os_priority[i] = prio_policy1[i];
3562 }
3563 }
3564 if (UseCriticalJavaThreadPriority) {
3565 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3566 }
3567 return 0;
3568 }
3569
3570 OSReturn os::set_native_priority(Thread* thread, int priority) {
3571 if (!UseThreadPriorities) return OS_OK;
3572 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3573 return ret ? OS_OK : OS_ERR;
3574 }
3575
3576 OSReturn os::get_native_priority(const Thread* const thread,
3577 int* priority_ptr) {
3578 if (!UseThreadPriorities) {
3579 *priority_ptr = java_to_os_priority[NormPriority];
3580 return OS_OK;
3581 }
3582 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3583 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3584 assert(false, "GetThreadPriority failed");
3585 return OS_ERR;
3586 }
3587 *priority_ptr = os_prio;
3588 return OS_OK;
3589 }
3590
3591 // GetCurrentThreadId() returns DWORD
3592 intx os::current_thread_id() { return GetCurrentThreadId(); }
3593
3594 static int _initial_pid = 0;
3595
3596 int os::current_process_id() {
3597 return (_initial_pid ? _initial_pid : _getpid());
3598 }
3599
3600 int os::win32::_vm_page_size = 0;
3601 int os::win32::_vm_allocation_granularity = 0;
3602 int os::win32::_processor_type = 0;
3603 // Processor level is not available on non-NT systems, use vm_version instead
3604 int os::win32::_processor_level = 0;
3605 julong os::win32::_physical_memory = 0;
3606 size_t os::win32::_default_stack_size = 0;
3607
3608 intx os::win32::_os_thread_limit = 0;
3609 volatile intx os::win32::_os_thread_count = 0;
3610
3611 bool os::win32::_is_windows_server = false;
3612
3613 // 6573254
3614 // Currently, the bug is observed across all the supported Windows releases,
3615 // including the latest one (as of this writing - Windows Server 2012 R2)
3616 bool os::win32::_has_exit_bug = true;
3617
3618 void os::win32::initialize_system_info() {
3619 SYSTEM_INFO si;
3620 GetSystemInfo(&si);
3621 _vm_page_size = si.dwPageSize;
3622 _vm_allocation_granularity = si.dwAllocationGranularity;
3623 _processor_type = si.dwProcessorType;
3624 _processor_level = si.wProcessorLevel;
3625 set_processor_count(si.dwNumberOfProcessors);
3626
3627 MEMORYSTATUSEX ms;
3628 ms.dwLength = sizeof(ms);
3629
3630 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3631 // dwMemoryLoad (% of memory in use)
3632 GlobalMemoryStatusEx(&ms);
3633 _physical_memory = ms.ullTotalPhys;
3634
3635 if (FLAG_IS_DEFAULT(MaxRAM)) {
3636 // Adjust MaxRAM according to the maximum virtual address space available.
3637 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3638 }
3639
3640 OSVERSIONINFOEX oi;
3641 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3642 GetVersionEx((OSVERSIONINFO*)&oi);
3643 switch (oi.dwPlatformId) {
3644 case VER_PLATFORM_WIN32_NT:
3645 {
3646 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3647 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3648 oi.wProductType == VER_NT_SERVER) {
3649 _is_windows_server = true;
3650 }
3651 }
3652 break;
3653 default: fatal("Unknown platform");
3654 }
3655
3656 _default_stack_size = os::current_stack_size();
3657 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3658 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3659 "stack size not a multiple of page size");
3660
3661 initialize_performance_counter();
3662 }
3663
3664
3665 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3666 int ebuflen) {
3667 char path[MAX_PATH];
3668 DWORD size;
3669 DWORD pathLen = (DWORD)sizeof(path);
3670 HINSTANCE result = NULL;
3671
3672 // only allow library name without path component
3673 assert(strchr(name, '\\') == NULL, "path not allowed");
3674 assert(strchr(name, ':') == NULL, "path not allowed");
3675 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3676 jio_snprintf(ebuf, ebuflen,
3677 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3678 return NULL;
3679 }
3680
3681 // search system directory
3682 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3683 if (size >= pathLen) {
3684 return NULL; // truncated
3685 }
3686 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3687 return NULL; // truncated
3688 }
3689 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3690 return result;
3691 }
3692 }
3693
3694 // try Windows directory
3695 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3696 if (size >= pathLen) {
3697 return NULL; // truncated
3698 }
3699 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3700 return NULL; // truncated
3701 }
3702 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3703 return result;
3704 }
3705 }
3706
3707 jio_snprintf(ebuf, ebuflen,
3708 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3709 return NULL;
3710 }
3711
3712 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3713 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3714
3715 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3716 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3717 return TRUE;
3718 }
3719
3720 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3721 // Basic approach:
3722 // - Each exiting thread registers its intent to exit and then does so.
3723 // - A thread trying to terminate the process must wait for all
3724 // threads currently exiting to complete their exit.
3725
3726 if (os::win32::has_exit_bug()) {
3727 // The array holds handles of the threads that have started exiting by calling
3728 // _endthreadex().
3729 // Should be large enough to avoid blocking the exiting thread due to lack of
3730 // a free slot.
3731 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3732 static int handle_count = 0;
3733
3734 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3735 static CRITICAL_SECTION crit_sect;
3736 static volatile DWORD process_exiting = 0;
3737 int i, j;
3738 DWORD res;
3739 HANDLE hproc, hthr;
3740
3741 // We only attempt to register threads until a process exiting
3742 // thread manages to set the process_exiting flag. Any threads
3743 // that come through here after the process_exiting flag is set
3744 // are unregistered and will be caught in the SuspendThread()
3745 // infinite loop below.
3746 bool registered = false;
3747
3748 // The first thread that reached this point, initializes the critical section.
3749 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3750 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3751 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3752 if (what != EPT_THREAD) {
3753 // Atomically set process_exiting before the critical section
3754 // to increase the visibility between racing threads.
3755 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3756 }
3757 EnterCriticalSection(&crit_sect);
3758
3759 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3760 // Remove from the array those handles of the threads that have completed exiting.
3761 for (i = 0, j = 0; i < handle_count; ++i) {
3762 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3763 if (res == WAIT_TIMEOUT) {
3764 handles[j++] = handles[i];
3765 } else {
3766 if (res == WAIT_FAILED) {
3767 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3768 GetLastError(), __FILE__, __LINE__);
3769 }
3770 // Don't keep the handle, if we failed waiting for it.
3771 CloseHandle(handles[i]);
3772 }
3773 }
3774
3775 // If there's no free slot in the array of the kept handles, we'll have to
3776 // wait until at least one thread completes exiting.
3777 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3778 // Raise the priority of the oldest exiting thread to increase its chances
3779 // to complete sooner.
3780 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3781 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3782 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3783 i = (res - WAIT_OBJECT_0);
3784 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3785 for (; i < handle_count; ++i) {
3786 handles[i] = handles[i + 1];
3787 }
3788 } else {
3789 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3790 (res == WAIT_FAILED ? "failed" : "timed out"),
3791 GetLastError(), __FILE__, __LINE__);
3792 // Don't keep handles, if we failed waiting for them.
3793 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3794 CloseHandle(handles[i]);
3795 }
3796 handle_count = 0;
3797 }
3798 }
3799
3800 // Store a duplicate of the current thread handle in the array of handles.
3801 hproc = GetCurrentProcess();
3802 hthr = GetCurrentThread();
3803 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3804 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3805 warning("DuplicateHandle failed (%u) in %s: %d\n",
3806 GetLastError(), __FILE__, __LINE__);
3807
3808 // We can't register this thread (no more handles) so this thread
3809 // may be racing with a thread that is calling exit(). If the thread
3810 // that is calling exit() has managed to set the process_exiting
3811 // flag, then this thread will be caught in the SuspendThread()
3812 // infinite loop below which closes that race. A small timing
3813 // window remains before the process_exiting flag is set, but it
3814 // is only exposed when we are out of handles.
3815 } else {
3816 ++handle_count;
3817 registered = true;
3818
3819 // The current exiting thread has stored its handle in the array, and now
3820 // should leave the critical section before calling _endthreadex().
3821 }
3822
3823 } else if (what != EPT_THREAD && handle_count > 0) {
3824 jlong start_time, finish_time, timeout_left;
3825 // Before ending the process, make sure all the threads that had called
3826 // _endthreadex() completed.
3827
3828 // Set the priority level of the current thread to the same value as
3829 // the priority level of exiting threads.
3830 // This is to ensure it will be given a fair chance to execute if
3831 // the timeout expires.
3832 hthr = GetCurrentThread();
3833 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3834 start_time = os::javaTimeNanos();
3835 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3836 for (i = 0; ; ) {
3837 int portion_count = handle_count - i;
3838 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3839 portion_count = MAXIMUM_WAIT_OBJECTS;
3840 }
3841 for (j = 0; j < portion_count; ++j) {
3842 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3843 }
3844 timeout_left = (finish_time - start_time) / 1000000L;
3845 if (timeout_left < 0) {
3846 timeout_left = 0;
3847 }
3848 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3849 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3850 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3851 (res == WAIT_FAILED ? "failed" : "timed out"),
3852 GetLastError(), __FILE__, __LINE__);
3853 // Reset portion_count so we close the remaining
3854 // handles due to this error.
3855 portion_count = handle_count - i;
3856 }
3857 for (j = 0; j < portion_count; ++j) {
3858 CloseHandle(handles[i + j]);
3859 }
3860 if ((i += portion_count) >= handle_count) {
3861 break;
3862 }
3863 start_time = os::javaTimeNanos();
3864 }
3865 handle_count = 0;
3866 }
3867
3868 LeaveCriticalSection(&crit_sect);
3869 }
3870
3871 if (!registered &&
3872 OrderAccess::load_acquire(&process_exiting) != 0 &&
3873 process_exiting != GetCurrentThreadId()) {
3874 // Some other thread is about to call exit(), so we don't let
3875 // the current unregistered thread proceed to exit() or _endthreadex()
3876 while (true) {
3877 SuspendThread(GetCurrentThread());
3878 // Avoid busy-wait loop, if SuspendThread() failed.
3879 Sleep(EXIT_TIMEOUT);
3880 }
3881 }
3882 }
3883
3884 // We are here if either
3885 // - there's no 'race at exit' bug on this OS release;
3886 // - initialization of the critical section failed (unlikely);
3887 // - the current thread has registered itself and left the critical section;
3888 // - the process-exiting thread has raised the flag and left the critical section.
3889 if (what == EPT_THREAD) {
3890 _endthreadex((unsigned)exit_code);
3891 } else if (what == EPT_PROCESS) {
3892 ::exit(exit_code);
3893 } else {
3894 _exit(exit_code);
3895 }
3896
3897 // Should not reach here
3898 return exit_code;
3899 }
3900
3901 #undef EXIT_TIMEOUT
3902
3903 void os::win32::setmode_streams() {
3904 _setmode(_fileno(stdin), _O_BINARY);
3905 _setmode(_fileno(stdout), _O_BINARY);
3906 _setmode(_fileno(stderr), _O_BINARY);
3907 }
3908
3909
3910 bool os::is_debugger_attached() {
3911 return IsDebuggerPresent() ? true : false;
3912 }
3913
3914
3915 void os::wait_for_keypress_at_exit(void) {
3916 if (PauseAtExit) {
3917 fprintf(stderr, "Press any key to continue...\n");
3918 fgetc(stdin);
3919 }
3920 }
3921
3922
3923 bool os::message_box(const char* title, const char* message) {
3924 int result = MessageBox(NULL, message, title,
3925 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3926 return result == IDYES;
3927 }
3928
3929 #ifndef PRODUCT
3930 #ifndef _WIN64
3931 // Helpers to check whether NX protection is enabled
3932 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3933 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3934 pex->ExceptionRecord->NumberParameters > 0 &&
3935 pex->ExceptionRecord->ExceptionInformation[0] ==
3936 EXCEPTION_INFO_EXEC_VIOLATION) {
3937 return EXCEPTION_EXECUTE_HANDLER;
3938 }
3939 return EXCEPTION_CONTINUE_SEARCH;
3940 }
3941
3942 void nx_check_protection() {
3943 // If NX is enabled we'll get an exception calling into code on the stack
3944 char code[] = { (char)0xC3 }; // ret
3945 void *code_ptr = (void *)code;
3946 __try {
3947 __asm call code_ptr
3948 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3949 tty->print_raw_cr("NX protection detected.");
3950 }
3951 }
3952 #endif // _WIN64
3953 #endif // PRODUCT
3954
3955 // This is called _before_ the global arguments have been parsed
3956 void os::init(void) {
3957 _initial_pid = _getpid();
3958
3959 init_random(1234567);
3960
3961 win32::initialize_system_info();
3962 win32::setmode_streams();
3963 init_page_sizes((size_t) win32::vm_page_size());
3964
3965 // This may be overridden later when argument processing is done.
3966 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
3967
3968 // Initialize main_process and main_thread
3969 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3970 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3971 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3972 fatal("DuplicateHandle failed\n");
3973 }
3974 main_thread_id = (int) GetCurrentThreadId();
3975
3976 // initialize fast thread access - only used for 32-bit
3977 win32::initialize_thread_ptr_offset();
3978 }
3979
3980 // To install functions for atexit processing
3981 extern "C" {
3982 static void perfMemory_exit_helper() {
3983 perfMemory_exit();
3984 }
3985 }
3986
3987 static jint initSock();
3988
3989 // this is called _after_ the global arguments have been parsed
3990 jint os::init_2(void) {
3991
3992 // This could be set any time but all platforms
3993 // have to set it the same so we have to mirror Solaris.
3994 DEBUG_ONLY(os::set_mutex_init_done();)
3995
3996 // Setup Windows Exceptions
3997
3998 #if INCLUDE_AOT
3999 // If AOT is enabled we need to install a vectored exception handler
4000 // in order to forward implicit exceptions from code in AOT
4001 // generated DLLs. This is necessary since these DLLs are not
4002 // registered for structured exceptions like codecache methods are.
4003 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4004 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4005 }
4006 #endif
4007
4008 // for debugging float code generation bugs
4009 if (ForceFloatExceptions) {
4010 #ifndef _WIN64
4011 static long fp_control_word = 0;
4012 __asm { fstcw fp_control_word }
4013 // see Intel PPro Manual, Vol. 2, p 7-16
4014 const long precision = 0x20;
4015 const long underflow = 0x10;
4016 const long overflow = 0x08;
4017 const long zero_div = 0x04;
4018 const long denorm = 0x02;
4019 const long invalid = 0x01;
4020 fp_control_word |= invalid;
4021 __asm { fldcw fp_control_word }
4022 #endif
4023 }
4024
4025 // If stack_commit_size is 0, windows will reserve the default size,
4026 // but only commit a small portion of it.
4027 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4028 size_t default_reserve_size = os::win32::default_stack_size();
4029 size_t actual_reserve_size = stack_commit_size;
4030 if (stack_commit_size < default_reserve_size) {
4031 // If stack_commit_size == 0, we want this too
4032 actual_reserve_size = default_reserve_size;
4033 }
4034
4035 // Check minimum allowable stack size for thread creation and to initialize
4036 // the java system classes, including StackOverflowError - depends on page
4037 // size. Add two 4K pages for compiler2 recursion in main thread.
4038 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4039 // class initialization depending on 32 or 64 bit VM.
4040 size_t min_stack_allowed =
4041 (size_t)(JavaThread::stack_guard_zone_size() +
4042 JavaThread::stack_shadow_zone_size() +
4043 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4044
4045 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4046
4047 if (actual_reserve_size < min_stack_allowed) {
4048 tty->print_cr("\nThe Java thread stack size specified is too small. "
4049 "Specify at least %dk",
4050 min_stack_allowed / K);
4051 return JNI_ERR;
4052 }
4053
4054 JavaThread::set_stack_size_at_create(stack_commit_size);
4055
4056 // Calculate theoretical max. size of Threads to guard gainst artifical
4057 // out-of-memory situations, where all available address-space has been
4058 // reserved by thread stacks.
4059 assert(actual_reserve_size != 0, "Must have a stack");
4060
4061 // Calculate the thread limit when we should start doing Virtual Memory
4062 // banging. Currently when the threads will have used all but 200Mb of space.
4063 //
4064 // TODO: consider performing a similar calculation for commit size instead
4065 // as reserve size, since on a 64-bit platform we'll run into that more
4066 // often than running out of virtual memory space. We can use the
4067 // lower value of the two calculations as the os_thread_limit.
4068 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4069 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4070
4071 // at exit methods are called in the reverse order of their registration.
4072 // there is no limit to the number of functions registered. atexit does
4073 // not set errno.
4074
4075 if (PerfAllowAtExitRegistration) {
4076 // only register atexit functions if PerfAllowAtExitRegistration is set.
4077 // atexit functions can be delayed until process exit time, which
4078 // can be problematic for embedded VM situations. Embedded VMs should
4079 // call DestroyJavaVM() to assure that VM resources are released.
4080
4081 // note: perfMemory_exit_helper atexit function may be removed in
4082 // the future if the appropriate cleanup code can be added to the
4083 // VM_Exit VMOperation's doit method.
4084 if (atexit(perfMemory_exit_helper) != 0) {
4085 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4086 }
4087 }
4088
4089 #ifndef _WIN64
4090 // Print something if NX is enabled (win32 on AMD64)
4091 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4092 #endif
4093
4094 // initialize thread priority policy
4095 prio_init();
4096
4097 if (UseNUMA && !ForceNUMA) {
4098 UseNUMA = false; // We don't fully support this yet
4099 }
4100
4101 if (UseNUMAInterleaving) {
4102 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4103 bool success = numa_interleaving_init();
4104 if (!success) UseNUMAInterleaving = false;
4105 }
4106
4107 if (initSock() != JNI_OK) {
4108 return JNI_ERR;
4109 }
4110
4111 SymbolEngine::recalc_search_path();
4112
4113 // Initialize data for jdk.internal.misc.Signal
4114 if (!ReduceSignalUsage) {
4115 jdk_misc_signal_init();
4116 }
4117
4118 return JNI_OK;
4119 }
4120
4121 // Mark the polling page as unreadable
4122 void os::make_polling_page_unreadable(void) {
4123 DWORD old_status;
4124 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4125 PAGE_NOACCESS, &old_status)) {
4126 fatal("Could not disable polling page");
4127 }
4128 }
4129
4130 // Mark the polling page as readable
4131 void os::make_polling_page_readable(void) {
4132 DWORD old_status;
4133 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4134 PAGE_READONLY, &old_status)) {
4135 fatal("Could not enable polling page");
4136 }
4137 }
4138
4139 // combine the high and low DWORD into a ULONGLONG
4140 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4141 ULONGLONG value = high_word;
4142 value <<= sizeof(high_word) * 8;
4143 value |= low_word;
4144 return value;
4145 }
4146
4147 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4148 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4149 ::memset((void*)sbuf, 0, sizeof(struct stat));
4150 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4151 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4152 file_data.ftLastWriteTime.dwLowDateTime);
4153 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4154 file_data.ftCreationTime.dwLowDateTime);
4155 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4156 file_data.ftLastAccessTime.dwLowDateTime);
4157 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4158 sbuf->st_mode |= S_IFDIR;
4159 } else {
4160 sbuf->st_mode |= S_IFREG;
4161 }
4162 }
4163
4164 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c
4165 // Creates an UNC path from a single byte path. Return buffer is
4166 // allocated in C heap and needs to be freed by the caller.
4167 // Returns NULL on error.
4168 static wchar_t* create_unc_path(const char* path, errno_t &err) {
4169 wchar_t* wpath = NULL;
4170 size_t converted_chars = 0;
4171 size_t path_len = strlen(path) + 1; // includes the terminating NULL
4172 if (path[0] == '\\' && path[1] == '\\') {
4173 if (path[2] == '?' && path[3] == '\\'){
4174 // if it already has a \\?\ don't do the prefix
4175 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal);
4176 if (wpath != NULL) {
4177 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len);
4178 } else {
4179 err = ENOMEM;
4180 }
4181 } else {
4182 // only UNC pathname includes double slashes here
4183 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal);
4184 if (wpath != NULL) {
4185 ::wcscpy(wpath, L"\\\\?\\UNC\0");
4186 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len);
4187 } else {
4188 err = ENOMEM;
4189 }
4190 }
4191 } else {
4192 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal);
4193 if (wpath != NULL) {
4194 ::wcscpy(wpath, L"\\\\?\\\0");
4195 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len);
4196 } else {
4197 err = ENOMEM;
4198 }
4199 }
4200 return wpath;
4201 }
4202
4203 static void destroy_unc_path(wchar_t* wpath) {
4204 os::free(wpath);
4205 }
4206
4207 int os::stat(const char *path, struct stat *sbuf) {
4208 char* pathbuf = (char*)os::strdup(path, mtInternal);
4209 if (pathbuf == NULL) {
4210 errno = ENOMEM;
4211 return -1;
4212 }
4213 os::native_path(pathbuf);
4214 int ret;
4215 WIN32_FILE_ATTRIBUTE_DATA file_data;
4216 // Not using stat() to avoid the problem described in JDK-6539723
4217 if (strlen(path) < MAX_PATH) {
4218 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data);
4219 if (!bret) {
4220 errno = ::GetLastError();
4221 ret = -1;
4222 }
4223 else {
4224 file_attribute_data_to_stat(sbuf, file_data);
4225 ret = 0;
4226 }
4227 } else {
4228 errno_t err = ERROR_SUCCESS;
4229 wchar_t* wpath = create_unc_path(pathbuf, err);
4230 if (err != ERROR_SUCCESS) {
4231 if (wpath != NULL) {
4232 destroy_unc_path(wpath);
4233 }
4234 os::free(pathbuf);
4235 errno = err;
4236 return -1;
4237 }
4238 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data);
4239 if (!bret) {
4240 errno = ::GetLastError();
4241 ret = -1;
4242 } else {
4243 file_attribute_data_to_stat(sbuf, file_data);
4244 ret = 0;
4245 }
4246 destroy_unc_path(wpath);
4247 }
4248 os::free(pathbuf);
4249 return ret;
4250 }
4251
4252 static HANDLE create_read_only_file_handle(const char* file) {
4253 if (file == NULL) {
4254 return INVALID_HANDLE_VALUE;
4255 }
4256
4257 char* nativepath = (char*)os::strdup(file, mtInternal);
4258 if (nativepath == NULL) {
4259 errno = ENOMEM;
4260 return INVALID_HANDLE_VALUE;
4261 }
4262 os::native_path(nativepath);
4263
4264 size_t len = strlen(nativepath);
4265 HANDLE handle = INVALID_HANDLE_VALUE;
4266
4267 if (len < MAX_PATH) {
4268 handle = ::CreateFile(nativepath, 0, FILE_SHARE_READ,
4269 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4270 } else {
4271 errno_t err = ERROR_SUCCESS;
4272 wchar_t* wfile = create_unc_path(nativepath, err);
4273 if (err != ERROR_SUCCESS) {
4274 if (wfile != NULL) {
4275 destroy_unc_path(wfile);
4276 }
4277 os::free(nativepath);
4278 return INVALID_HANDLE_VALUE;
4279 }
4280 handle = ::CreateFileW(wfile, 0, FILE_SHARE_READ,
4281 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4282 destroy_unc_path(wfile);
4283 }
4284
4285 os::free(nativepath);
4286 return handle;
4287 }
4288
4289 bool os::same_files(const char* file1, const char* file2) {
4290
4291 if (file1 == NULL && file2 == NULL) {
4292 return true;
4293 }
4294
4295 if (file1 == NULL || file2 == NULL) {
4296 return false;
4297 }
4298
4299 if (strcmp(file1, file2) == 0) {
4300 return true;
4301 }
4302
4303 HANDLE handle1 = create_read_only_file_handle(file1);
4304 HANDLE handle2 = create_read_only_file_handle(file2);
4305 bool result = false;
4306
4307 // if we could open both paths...
4308 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4309 BY_HANDLE_FILE_INFORMATION fileInfo1;
4310 BY_HANDLE_FILE_INFORMATION fileInfo2;
4311 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4312 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4313 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4314 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4315 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4316 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4317 result = true;
4318 }
4319 }
4320 }
4321
4322 //free the handles
4323 if (handle1 != INVALID_HANDLE_VALUE) {
4324 ::CloseHandle(handle1);
4325 }
4326
4327 if (handle2 != INVALID_HANDLE_VALUE) {
4328 ::CloseHandle(handle2);
4329 }
4330
4331 return result;
4332 }
4333
4334
4335 #define FT2INT64(ft) \
4336 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4337
4338
4339 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4340 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4341 // of a thread.
4342 //
4343 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4344 // the fast estimate available on the platform.
4345
4346 // current_thread_cpu_time() is not optimized for Windows yet
4347 jlong os::current_thread_cpu_time() {
4348 // return user + sys since the cost is the same
4349 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4350 }
4351
4352 jlong os::thread_cpu_time(Thread* thread) {
4353 // consistent with what current_thread_cpu_time() returns.
4354 return os::thread_cpu_time(thread, true /* user+sys */);
4355 }
4356
4357 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4358 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4359 }
4360
4361 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4362 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4363 // If this function changes, os::is_thread_cpu_time_supported() should too
4364 FILETIME CreationTime;
4365 FILETIME ExitTime;
4366 FILETIME KernelTime;
4367 FILETIME UserTime;
4368
4369 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4370 &ExitTime, &KernelTime, &UserTime) == 0) {
4371 return -1;
4372 } else if (user_sys_cpu_time) {
4373 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4374 } else {
4375 return FT2INT64(UserTime) * 100;
4376 }
4377 }
4378
4379 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4380 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4381 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4382 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4383 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4384 }
4385
4386 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4387 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4388 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4389 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4390 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4391 }
4392
4393 bool os::is_thread_cpu_time_supported() {
4394 // see os::thread_cpu_time
4395 FILETIME CreationTime;
4396 FILETIME ExitTime;
4397 FILETIME KernelTime;
4398 FILETIME UserTime;
4399
4400 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4401 &KernelTime, &UserTime) == 0) {
4402 return false;
4403 } else {
4404 return true;
4405 }
4406 }
4407
4408 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4409 // It does have primitives (PDH API) to get CPU usage and run queue length.
4410 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4411 // If we wanted to implement loadavg on Windows, we have a few options:
4412 //
4413 // a) Query CPU usage and run queue length and "fake" an answer by
4414 // returning the CPU usage if it's under 100%, and the run queue
4415 // length otherwise. It turns out that querying is pretty slow
4416 // on Windows, on the order of 200 microseconds on a fast machine.
4417 // Note that on the Windows the CPU usage value is the % usage
4418 // since the last time the API was called (and the first call
4419 // returns 100%), so we'd have to deal with that as well.
4420 //
4421 // b) Sample the "fake" answer using a sampling thread and store
4422 // the answer in a global variable. The call to loadavg would
4423 // just return the value of the global, avoiding the slow query.
4424 //
4425 // c) Sample a better answer using exponential decay to smooth the
4426 // value. This is basically the algorithm used by UNIX kernels.
4427 //
4428 // Note that sampling thread starvation could affect both (b) and (c).
4429 int os::loadavg(double loadavg[], int nelem) {
4430 return -1;
4431 }
4432
4433
4434 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4435 bool os::dont_yield() {
4436 return DontYieldALot;
4437 }
4438
4439 // This method is a slightly reworked copy of JDK's sysOpen
4440 // from src/windows/hpi/src/sys_api_md.c
4441
4442 int os::open(const char *path, int oflag, int mode) {
4443 char* pathbuf = (char*)os::strdup(path, mtInternal);
4444 if (pathbuf == NULL) {
4445 errno = ENOMEM;
4446 return -1;
4447 }
4448 os::native_path(pathbuf);
4449 int ret;
4450 if (strlen(path) < MAX_PATH) {
4451 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4452 } else {
4453 errno_t err = ERROR_SUCCESS;
4454 wchar_t* wpath = create_unc_path(pathbuf, err);
4455 if (err != ERROR_SUCCESS) {
4456 if (wpath != NULL) {
4457 destroy_unc_path(wpath);
4458 }
4459 os::free(pathbuf);
4460 errno = err;
4461 return -1;
4462 }
4463 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode);
4464 if (ret == -1) {
4465 errno = ::GetLastError();
4466 }
4467 destroy_unc_path(wpath);
4468 }
4469 os::free(pathbuf);
4470 return ret;
4471 }
4472
4473 FILE* os::open(int fd, const char* mode) {
4474 return ::_fdopen(fd, mode);
4475 }
4476
4477 // Is a (classpath) directory empty?
4478 bool os::dir_is_empty(const char* path) {
4479 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
4480 if (search_path == NULL) {
4481 errno = ENOMEM;
4482 return false;
4483 }
4484 strcpy(search_path, path);
4485 os::native_path(search_path);
4486 // Append "*", or possibly "\\*", to path
4487 if (search_path[1] == ':' &&
4488 (search_path[2] == '\0' ||
4489 (search_path[2] == '\\' && search_path[3] == '\0'))) {
4490 // No '\\' needed for cases like "Z:" or "Z:\"
4491 strcat(search_path, "*");
4492 }
4493 else {
4494 strcat(search_path, "\\*");
4495 }
4496 errno_t err = ERROR_SUCCESS;
4497 wchar_t* wpath = create_unc_path(search_path, err);
4498 if (err != ERROR_SUCCESS) {
4499 if (wpath != NULL) {
4500 destroy_unc_path(wpath);
4501 }
4502 os::free(search_path);
4503 errno = err;
4504 return false;
4505 }
4506 WIN32_FIND_DATAW fd;
4507 HANDLE f = ::FindFirstFileW(wpath, &fd);
4508 destroy_unc_path(wpath);
4509 bool is_empty = true;
4510 if (f != INVALID_HANDLE_VALUE) {
4511 while (is_empty && ::FindNextFileW(f, &fd)) {
4512 // An empty directory contains only the current directory file
4513 // and the previous directory file.
4514 if ((wcscmp(fd.cFileName, L".") != 0) &&
4515 (wcscmp(fd.cFileName, L"..") != 0)) {
4516 is_empty = false;
4517 }
4518 }
4519 FindClose(f);
4520 }
4521 os::free(search_path);
4522 return is_empty;
4523 }
4524
4525 // create binary file, rewriting existing file if required
4526 int os::create_binary_file(const char* path, bool rewrite_existing) {
4527 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4528 if (!rewrite_existing) {
4529 oflags |= _O_EXCL;
4530 }
4531 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4532 }
4533
4534 // return current position of file pointer
4535 jlong os::current_file_offset(int fd) {
4536 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4537 }
4538
4539 // move file pointer to the specified offset
4540 jlong os::seek_to_file_offset(int fd, jlong offset) {
4541 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4542 }
4543
4544
4545 jlong os::lseek(int fd, jlong offset, int whence) {
4546 return (jlong) ::_lseeki64(fd, offset, whence);
4547 }
4548
4549 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4550 OVERLAPPED ov;
4551 DWORD nread;
4552 BOOL result;
4553
4554 ZeroMemory(&ov, sizeof(ov));
4555 ov.Offset = (DWORD)offset;
4556 ov.OffsetHigh = (DWORD)(offset >> 32);
4557
4558 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4559
4560 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4561
4562 return result ? nread : 0;
4563 }
4564
4565
4566 // This method is a slightly reworked copy of JDK's sysNativePath
4567 // from src/windows/hpi/src/path_md.c
4568
4569 // Convert a pathname to native format. On win32, this involves forcing all
4570 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4571 // sometimes rejects '/') and removing redundant separators. The input path is
4572 // assumed to have been converted into the character encoding used by the local
4573 // system. Because this might be a double-byte encoding, care is taken to
4574 // treat double-byte lead characters correctly.
4575 //
4576 // This procedure modifies the given path in place, as the result is never
4577 // longer than the original. There is no error return; this operation always
4578 // succeeds.
4579 char * os::native_path(char *path) {
4580 char *src = path, *dst = path, *end = path;
4581 char *colon = NULL; // If a drive specifier is found, this will
4582 // point to the colon following the drive letter
4583
4584 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4585 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4586 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4587
4588 // Check for leading separators
4589 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4590 while (isfilesep(*src)) {
4591 src++;
4592 }
4593
4594 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4595 // Remove leading separators if followed by drive specifier. This
4596 // hack is necessary to support file URLs containing drive
4597 // specifiers (e.g., "file://c:/path"). As a side effect,
4598 // "/c:/path" can be used as an alternative to "c:/path".
4599 *dst++ = *src++;
4600 colon = dst;
4601 *dst++ = ':';
4602 src++;
4603 } else {
4604 src = path;
4605 if (isfilesep(src[0]) && isfilesep(src[1])) {
4606 // UNC pathname: Retain first separator; leave src pointed at
4607 // second separator so that further separators will be collapsed
4608 // into the second separator. The result will be a pathname
4609 // beginning with "\\\\" followed (most likely) by a host name.
4610 src = dst = path + 1;
4611 path[0] = '\\'; // Force first separator to '\\'
4612 }
4613 }
4614
4615 end = dst;
4616
4617 // Remove redundant separators from remainder of path, forcing all
4618 // separators to be '\\' rather than '/'. Also, single byte space
4619 // characters are removed from the end of the path because those
4620 // are not legal ending characters on this operating system.
4621 //
4622 while (*src != '\0') {
4623 if (isfilesep(*src)) {
4624 *dst++ = '\\'; src++;
4625 while (isfilesep(*src)) src++;
4626 if (*src == '\0') {
4627 // Check for trailing separator
4628 end = dst;
4629 if (colon == dst - 2) break; // "z:\\"
4630 if (dst == path + 1) break; // "\\"
4631 if (dst == path + 2 && isfilesep(path[0])) {
4632 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4633 // beginning of a UNC pathname. Even though it is not, by
4634 // itself, a valid UNC pathname, we leave it as is in order
4635 // to be consistent with the path canonicalizer as well
4636 // as the win32 APIs, which treat this case as an invalid
4637 // UNC pathname rather than as an alias for the root
4638 // directory of the current drive.
4639 break;
4640 }
4641 end = --dst; // Path does not denote a root directory, so
4642 // remove trailing separator
4643 break;
4644 }
4645 end = dst;
4646 } else {
4647 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4648 *dst++ = *src++;
4649 if (*src) *dst++ = *src++;
4650 end = dst;
4651 } else { // Copy a single-byte character
4652 char c = *src++;
4653 *dst++ = c;
4654 // Space is not a legal ending character
4655 if (c != ' ') end = dst;
4656 }
4657 }
4658 }
4659
4660 *end = '\0';
4661
4662 // For "z:", add "." to work around a bug in the C runtime library
4663 if (colon == dst - 1) {
4664 path[2] = '.';
4665 path[3] = '\0';
4666 }
4667
4668 return path;
4669 }
4670
4671 // This code is a copy of JDK's sysSetLength
4672 // from src/windows/hpi/src/sys_api_md.c
4673
4674 int os::ftruncate(int fd, jlong length) {
4675 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4676 long high = (long)(length >> 32);
4677 DWORD ret;
4678
4679 if (h == (HANDLE)(-1)) {
4680 return -1;
4681 }
4682
4683 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4684 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4685 return -1;
4686 }
4687
4688 if (::SetEndOfFile(h) == FALSE) {
4689 return -1;
4690 }
4691
4692 return 0;
4693 }
4694
4695 int os::get_fileno(FILE* fp) {
4696 return _fileno(fp);
4697 }
4698
4699 // This code is a copy of JDK's sysSync
4700 // from src/windows/hpi/src/sys_api_md.c
4701 // except for the legacy workaround for a bug in Win 98
4702
4703 int os::fsync(int fd) {
4704 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4705
4706 if ((!::FlushFileBuffers(handle)) &&
4707 (GetLastError() != ERROR_ACCESS_DENIED)) {
4708 // from winerror.h
4709 return -1;
4710 }
4711 return 0;
4712 }
4713
4714 static int nonSeekAvailable(int, long *);
4715 static int stdinAvailable(int, long *);
4716
4717 // This code is a copy of JDK's sysAvailable
4718 // from src/windows/hpi/src/sys_api_md.c
4719
4720 int os::available(int fd, jlong *bytes) {
4721 jlong cur, end;
4722 struct _stati64 stbuf64;
4723
4724 if (::_fstati64(fd, &stbuf64) >= 0) {
4725 int mode = stbuf64.st_mode;
4726 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4727 int ret;
4728 long lpbytes;
4729 if (fd == 0) {
4730 ret = stdinAvailable(fd, &lpbytes);
4731 } else {
4732 ret = nonSeekAvailable(fd, &lpbytes);
4733 }
4734 (*bytes) = (jlong)(lpbytes);
4735 return ret;
4736 }
4737 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4738 return FALSE;
4739 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4740 return FALSE;
4741 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4742 return FALSE;
4743 }
4744 *bytes = end - cur;
4745 return TRUE;
4746 } else {
4747 return FALSE;
4748 }
4749 }
4750
4751 void os::flockfile(FILE* fp) {
4752 _lock_file(fp);
4753 }
4754
4755 void os::funlockfile(FILE* fp) {
4756 _unlock_file(fp);
4757 }
4758
4759 // This code is a copy of JDK's nonSeekAvailable
4760 // from src/windows/hpi/src/sys_api_md.c
4761
4762 static int nonSeekAvailable(int fd, long *pbytes) {
4763 // This is used for available on non-seekable devices
4764 // (like both named and anonymous pipes, such as pipes
4765 // connected to an exec'd process).
4766 // Standard Input is a special case.
4767 HANDLE han;
4768
4769 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4770 return FALSE;
4771 }
4772
4773 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4774 // PeekNamedPipe fails when at EOF. In that case we
4775 // simply make *pbytes = 0 which is consistent with the
4776 // behavior we get on Solaris when an fd is at EOF.
4777 // The only alternative is to raise an Exception,
4778 // which isn't really warranted.
4779 //
4780 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4781 return FALSE;
4782 }
4783 *pbytes = 0;
4784 }
4785 return TRUE;
4786 }
4787
4788 #define MAX_INPUT_EVENTS 2000
4789
4790 // This code is a copy of JDK's stdinAvailable
4791 // from src/windows/hpi/src/sys_api_md.c
4792
4793 static int stdinAvailable(int fd, long *pbytes) {
4794 HANDLE han;
4795 DWORD numEventsRead = 0; // Number of events read from buffer
4796 DWORD numEvents = 0; // Number of events in buffer
4797 DWORD i = 0; // Loop index
4798 DWORD curLength = 0; // Position marker
4799 DWORD actualLength = 0; // Number of bytes readable
4800 BOOL error = FALSE; // Error holder
4801 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4802
4803 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4804 return FALSE;
4805 }
4806
4807 // Construct an array of input records in the console buffer
4808 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4809 if (error == 0) {
4810 return nonSeekAvailable(fd, pbytes);
4811 }
4812
4813 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4814 if (numEvents > MAX_INPUT_EVENTS) {
4815 numEvents = MAX_INPUT_EVENTS;
4816 }
4817
4818 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4819 if (lpBuffer == NULL) {
4820 return FALSE;
4821 }
4822
4823 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4824 if (error == 0) {
4825 os::free(lpBuffer);
4826 return FALSE;
4827 }
4828
4829 // Examine input records for the number of bytes available
4830 for (i=0; i<numEvents; i++) {
4831 if (lpBuffer[i].EventType == KEY_EVENT) {
4832
4833 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4834 &(lpBuffer[i].Event);
4835 if (keyRecord->bKeyDown == TRUE) {
4836 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4837 curLength++;
4838 if (*keyPressed == '\r') {
4839 actualLength = curLength;
4840 }
4841 }
4842 }
4843 }
4844
4845 if (lpBuffer != NULL) {
4846 os::free(lpBuffer);
4847 }
4848
4849 *pbytes = (long) actualLength;
4850 return TRUE;
4851 }
4852
4853 // Map a block of memory.
4854 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4855 char *addr, size_t bytes, bool read_only,
4856 bool allow_exec) {
4857 HANDLE hFile;
4858 char* base;
4859
4860 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4861 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4862 if (hFile == NULL) {
4863 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4864 return NULL;
4865 }
4866
4867 if (allow_exec) {
4868 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4869 // unless it comes from a PE image (which the shared archive is not.)
4870 // Even VirtualProtect refuses to give execute access to mapped memory
4871 // that was not previously executable.
4872 //
4873 // Instead, stick the executable region in anonymous memory. Yuck.
4874 // Penalty is that ~4 pages will not be shareable - in the future
4875 // we might consider DLLizing the shared archive with a proper PE
4876 // header so that mapping executable + sharing is possible.
4877
4878 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4879 PAGE_READWRITE);
4880 if (base == NULL) {
4881 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4882 CloseHandle(hFile);
4883 return NULL;
4884 }
4885
4886 // Record virtual memory allocation
4887 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
4888
4889 DWORD bytes_read;
4890 OVERLAPPED overlapped;
4891 overlapped.Offset = (DWORD)file_offset;
4892 overlapped.OffsetHigh = 0;
4893 overlapped.hEvent = NULL;
4894 // ReadFile guarantees that if the return value is true, the requested
4895 // number of bytes were read before returning.
4896 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4897 if (!res) {
4898 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4899 release_memory(base, bytes);
4900 CloseHandle(hFile);
4901 return NULL;
4902 }
4903 } else {
4904 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4905 NULL /* file_name */);
4906 if (hMap == NULL) {
4907 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4908 CloseHandle(hFile);
4909 return NULL;
4910 }
4911
4912 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4913 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4914 (DWORD)bytes, addr);
4915 if (base == NULL) {
4916 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4917 CloseHandle(hMap);
4918 CloseHandle(hFile);
4919 return NULL;
4920 }
4921
4922 if (CloseHandle(hMap) == 0) {
4923 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4924 CloseHandle(hFile);
4925 return base;
4926 }
4927 }
4928
4929 if (allow_exec) {
4930 DWORD old_protect;
4931 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4932 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4933
4934 if (!res) {
4935 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4936 // Don't consider this a hard error, on IA32 even if the
4937 // VirtualProtect fails, we should still be able to execute
4938 CloseHandle(hFile);
4939 return base;
4940 }
4941 }
4942
4943 if (CloseHandle(hFile) == 0) {
4944 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4945 return base;
4946 }
4947
4948 return base;
4949 }
4950
4951
4952 // Remap a block of memory.
4953 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4954 char *addr, size_t bytes, bool read_only,
4955 bool allow_exec) {
4956 // This OS does not allow existing memory maps to be remapped so we
4957 // would have to unmap the memory before we remap it.
4958
4959 // Because there is a small window between unmapping memory and mapping
4960 // it in again with different protections, CDS archives are mapped RW
4961 // on windows, so this function isn't called.
4962 ShouldNotReachHere();
4963 return NULL;
4964 }
4965
4966
4967 // Unmap a block of memory.
4968 // Returns true=success, otherwise false.
4969
4970 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4971 MEMORY_BASIC_INFORMATION mem_info;
4972 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4973 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4974 return false;
4975 }
4976
4977 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4978 // Instead, executable region was allocated using VirtualAlloc(). See
4979 // pd_map_memory() above.
4980 //
4981 // The following flags should match the 'exec_access' flages used for
4982 // VirtualProtect() in pd_map_memory().
4983 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4984 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4985 return pd_release_memory(addr, bytes);
4986 }
4987
4988 BOOL result = UnmapViewOfFile(addr);
4989 if (result == 0) {
4990 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4991 return false;
4992 }
4993 return true;
4994 }
4995
4996 void os::pause() {
4997 char filename[MAX_PATH];
4998 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4999 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5000 } else {
5001 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5002 }
5003
5004 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5005 if (fd != -1) {
5006 struct stat buf;
5007 ::close(fd);
5008 while (::stat(filename, &buf) == 0) {
5009 Sleep(100);
5010 }
5011 } else {
5012 jio_fprintf(stderr,
5013 "Could not open pause file '%s', continuing immediately.\n", filename);
5014 }
5015 }
5016
5017 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5018 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5019 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5020
5021 os::ThreadCrashProtection::ThreadCrashProtection() {
5022 }
5023
5024 // See the caveats for this class in os_windows.hpp
5025 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5026 // into this method and returns false. If no OS EXCEPTION was raised, returns
5027 // true.
5028 // The callback is supposed to provide the method that should be protected.
5029 //
5030 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5031
5032 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5033
5034 _protected_thread = Thread::current_or_null();
5035 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5036
5037 bool success = true;
5038 __try {
5039 _crash_protection = this;
5040 cb.call();
5041 } __except(EXCEPTION_EXECUTE_HANDLER) {
5042 // only for protection, nothing to do
5043 success = false;
5044 }
5045 _crash_protection = NULL;
5046 _protected_thread = NULL;
5047 Thread::muxRelease(&_crash_mux);
5048 return success;
5049 }
5050
5051
5052 class HighResolutionInterval : public CHeapObj<mtThread> {
5053 // The default timer resolution seems to be 10 milliseconds.
5054 // (Where is this written down?)
5055 // If someone wants to sleep for only a fraction of the default,
5056 // then we set the timer resolution down to 1 millisecond for
5057 // the duration of their interval.
5058 // We carefully set the resolution back, since otherwise we
5059 // seem to incur an overhead (3%?) that we don't need.
5060 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5061 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5062 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5063 // timeBeginPeriod() if the relative error exceeded some threshold.
5064 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5065 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5066 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5067 // resolution timers running.
5068 private:
5069 jlong resolution;
5070 public:
5071 HighResolutionInterval(jlong ms) {
5072 resolution = ms % 10L;
5073 if (resolution != 0) {
5074 MMRESULT result = timeBeginPeriod(1L);
5075 }
5076 }
5077 ~HighResolutionInterval() {
5078 if (resolution != 0) {
5079 MMRESULT result = timeEndPeriod(1L);
5080 }
5081 resolution = 0L;
5082 }
5083 };
5084
5085 // An Event wraps a win32 "CreateEvent" kernel handle.
5086 //
5087 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5088 //
5089 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5090 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5091 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5092 // In addition, an unpark() operation might fetch the handle field, but the
5093 // event could recycle between the fetch and the SetEvent() operation.
5094 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5095 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5096 // on an stale but recycled handle would be harmless, but in practice this might
5097 // confuse other non-Sun code, so it's not a viable approach.
5098 //
5099 // 2: Once a win32 event handle is associated with an Event, it remains associated
5100 // with the Event. The event handle is never closed. This could be construed
5101 // as handle leakage, but only up to the maximum # of threads that have been extant
5102 // at any one time. This shouldn't be an issue, as windows platforms typically
5103 // permit a process to have hundreds of thousands of open handles.
5104 //
5105 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5106 // and release unused handles.
5107 //
5108 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5109 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5110 //
5111 // 5. Use an RCU-like mechanism (Read-Copy Update).
5112 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5113 //
5114 // We use (2).
5115 //
5116 // TODO-FIXME:
5117 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5118 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5119 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5120 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5121 // into a single win32 CreateEvent() handle.
5122 //
5123 // Assumption:
5124 // Only one parker can exist on an event, which is why we allocate
5125 // them per-thread. Multiple unparkers can coexist.
5126 //
5127 // _Event transitions in park()
5128 // -1 => -1 : illegal
5129 // 1 => 0 : pass - return immediately
5130 // 0 => -1 : block; then set _Event to 0 before returning
5131 //
5132 // _Event transitions in unpark()
5133 // 0 => 1 : just return
5134 // 1 => 1 : just return
5135 // -1 => either 0 or 1; must signal target thread
5136 // That is, we can safely transition _Event from -1 to either
5137 // 0 or 1.
5138 //
5139 // _Event serves as a restricted-range semaphore.
5140 // -1 : thread is blocked, i.e. there is a waiter
5141 // 0 : neutral: thread is running or ready,
5142 // could have been signaled after a wait started
5143 // 1 : signaled - thread is running or ready
5144 //
5145 // Another possible encoding of _Event would be with
5146 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5147 //
5148
5149 int os::PlatformEvent::park(jlong Millis) {
5150 // Transitions for _Event:
5151 // -1 => -1 : illegal
5152 // 1 => 0 : pass - return immediately
5153 // 0 => -1 : block; then set _Event to 0 before returning
5154
5155 guarantee(_ParkHandle != NULL , "Invariant");
5156 guarantee(Millis > 0 , "Invariant");
5157
5158 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5159 // the initial park() operation.
5160 // Consider: use atomic decrement instead of CAS-loop
5161
5162 int v;
5163 for (;;) {
5164 v = _Event;
5165 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5166 }
5167 guarantee((v == 0) || (v == 1), "invariant");
5168 if (v != 0) return OS_OK;
5169
5170 // Do this the hard way by blocking ...
5171 // TODO: consider a brief spin here, gated on the success of recent
5172 // spin attempts by this thread.
5173 //
5174 // We decompose long timeouts into series of shorter timed waits.
5175 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5176 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5177 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5178 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5179 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5180 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5181 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5182 // for the already waited time. This policy does not admit any new outcomes.
5183 // In the future, however, we might want to track the accumulated wait time and
5184 // adjust Millis accordingly if we encounter a spurious wakeup.
5185
5186 const int MAXTIMEOUT = 0x10000000;
5187 DWORD rv = WAIT_TIMEOUT;
5188 while (_Event < 0 && Millis > 0) {
5189 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5190 if (Millis > MAXTIMEOUT) {
5191 prd = MAXTIMEOUT;
5192 }
5193 HighResolutionInterval *phri = NULL;
5194 if (!ForceTimeHighResolution) {
5195 phri = new HighResolutionInterval(prd);
5196 }
5197 rv = ::WaitForSingleObject(_ParkHandle, prd);
5198 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5199 if (rv == WAIT_TIMEOUT) {
5200 Millis -= prd;
5201 }
5202 delete phri; // if it is NULL, harmless
5203 }
5204 v = _Event;
5205 _Event = 0;
5206 // see comment at end of os::PlatformEvent::park() below:
5207 OrderAccess::fence();
5208 // If we encounter a nearly simultanous timeout expiry and unpark()
5209 // we return OS_OK indicating we awoke via unpark().
5210 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5211 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5212 }
5213
5214 void os::PlatformEvent::park() {
5215 // Transitions for _Event:
5216 // -1 => -1 : illegal
5217 // 1 => 0 : pass - return immediately
5218 // 0 => -1 : block; then set _Event to 0 before returning
5219
5220 guarantee(_ParkHandle != NULL, "Invariant");
5221 // Invariant: Only the thread associated with the Event/PlatformEvent
5222 // may call park().
5223 // Consider: use atomic decrement instead of CAS-loop
5224 int v;
5225 for (;;) {
5226 v = _Event;
5227 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5228 }
5229 guarantee((v == 0) || (v == 1), "invariant");
5230 if (v != 0) return;
5231
5232 // Do this the hard way by blocking ...
5233 // TODO: consider a brief spin here, gated on the success of recent
5234 // spin attempts by this thread.
5235 while (_Event < 0) {
5236 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5237 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5238 }
5239
5240 // Usually we'll find _Event == 0 at this point, but as
5241 // an optional optimization we clear it, just in case can
5242 // multiple unpark() operations drove _Event up to 1.
5243 _Event = 0;
5244 OrderAccess::fence();
5245 guarantee(_Event >= 0, "invariant");
5246 }
5247
5248 void os::PlatformEvent::unpark() {
5249 guarantee(_ParkHandle != NULL, "Invariant");
5250
5251 // Transitions for _Event:
5252 // 0 => 1 : just return
5253 // 1 => 1 : just return
5254 // -1 => either 0 or 1; must signal target thread
5255 // That is, we can safely transition _Event from -1 to either
5256 // 0 or 1.
5257 // See also: "Semaphores in Plan 9" by Mullender & Cox
5258 //
5259 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5260 // that it will take two back-to-back park() calls for the owning
5261 // thread to block. This has the benefit of forcing a spurious return
5262 // from the first park() call after an unpark() call which will help
5263 // shake out uses of park() and unpark() without condition variables.
5264
5265 if (Atomic::xchg(1, &_Event) >= 0) return;
5266
5267 ::SetEvent(_ParkHandle);
5268 }
5269
5270
5271 // JSR166
5272 // -------------------------------------------------------
5273
5274 // The Windows implementation of Park is very straightforward: Basic
5275 // operations on Win32 Events turn out to have the right semantics to
5276 // use them directly. We opportunistically resuse the event inherited
5277 // from Monitor.
5278
5279 void Parker::park(bool isAbsolute, jlong time) {
5280 guarantee(_ParkEvent != NULL, "invariant");
5281 // First, demultiplex/decode time arguments
5282 if (time < 0) { // don't wait
5283 return;
5284 } else if (time == 0 && !isAbsolute) {
5285 time = INFINITE;
5286 } else if (isAbsolute) {
5287 time -= os::javaTimeMillis(); // convert to relative time
5288 if (time <= 0) { // already elapsed
5289 return;
5290 }
5291 } else { // relative
5292 time /= 1000000; // Must coarsen from nanos to millis
5293 if (time == 0) { // Wait for the minimal time unit if zero
5294 time = 1;
5295 }
5296 }
5297
5298 JavaThread* thread = JavaThread::current();
5299
5300 // Don't wait if interrupted or already triggered
5301 if (thread->is_interrupted(false) ||
5302 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5303 ResetEvent(_ParkEvent);
5304 return;
5305 } else {
5306 ThreadBlockInVM tbivm(thread);
5307 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5308 thread->set_suspend_equivalent();
5309
5310 WaitForSingleObject(_ParkEvent, time);
5311 ResetEvent(_ParkEvent);
5312
5313 // If externally suspended while waiting, re-suspend
5314 if (thread->handle_special_suspend_equivalent_condition()) {
5315 thread->java_suspend_self();
5316 }
5317 }
5318 }
5319
5320 void Parker::unpark() {
5321 guarantee(_ParkEvent != NULL, "invariant");
5322 SetEvent(_ParkEvent);
5323 }
5324
5325 // Platform Monitor implementation
5326
5327 // Must already be locked
5328 int os::PlatformMonitor::wait(jlong millis) {
5329 assert(millis >= 0, "negative timeout");
5330 int ret = OS_TIMEOUT;
5331 int status = SleepConditionVariableCS(&_cond, &_mutex,
5332 millis == 0 ? INFINITE : millis);
5333 if (status != 0) {
5334 ret = OS_OK;
5335 }
5336 #ifndef PRODUCT
5337 else {
5338 DWORD err = GetLastError();
5339 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5340 }
5341 #endif
5342 return ret;
5343 }
5344
5345 // Run the specified command in a separate process. Return its exit value,
5346 // or -1 on failure (e.g. can't create a new process).
5347 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5348 STARTUPINFO si;
5349 PROCESS_INFORMATION pi;
5350 DWORD exit_code;
5351
5352 char * cmd_string;
5353 const char * cmd_prefix = "cmd /C ";
5354 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5355 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5356 if (cmd_string == NULL) {
5357 return -1;
5358 }
5359 cmd_string[0] = '\0';
5360 strcat(cmd_string, cmd_prefix);
5361 strcat(cmd_string, cmd);
5362
5363 // now replace all '\n' with '&'
5364 char * substring = cmd_string;
5365 while ((substring = strchr(substring, '\n')) != NULL) {
5366 substring[0] = '&';
5367 substring++;
5368 }
5369 memset(&si, 0, sizeof(si));
5370 si.cb = sizeof(si);
5371 memset(&pi, 0, sizeof(pi));
5372 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5373 cmd_string, // command line
5374 NULL, // process security attribute
5375 NULL, // thread security attribute
5376 TRUE, // inherits system handles
5377 0, // no creation flags
5378 NULL, // use parent's environment block
5379 NULL, // use parent's starting directory
5380 &si, // (in) startup information
5381 &pi); // (out) process information
5382
5383 if (rslt) {
5384 // Wait until child process exits.
5385 WaitForSingleObject(pi.hProcess, INFINITE);
5386
5387 GetExitCodeProcess(pi.hProcess, &exit_code);
5388
5389 // Close process and thread handles.
5390 CloseHandle(pi.hProcess);
5391 CloseHandle(pi.hThread);
5392 } else {
5393 exit_code = -1;
5394 }
5395
5396 FREE_C_HEAP_ARRAY(char, cmd_string);
5397 return (int)exit_code;
5398 }
5399
5400 bool os::find(address addr, outputStream* st) {
5401 int offset = -1;
5402 bool result = false;
5403 char buf[256];
5404 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5405 st->print(PTR_FORMAT " ", addr);
5406 if (strlen(buf) < sizeof(buf) - 1) {
5407 char* p = strrchr(buf, '\\');
5408 if (p) {
5409 st->print("%s", p + 1);
5410 } else {
5411 st->print("%s", buf);
5412 }
5413 } else {
5414 // The library name is probably truncated. Let's omit the library name.
5415 // See also JDK-8147512.
5416 }
5417 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5418 st->print("::%s + 0x%x", buf, offset);
5419 }
5420 st->cr();
5421 result = true;
5422 }
5423 return result;
5424 }
5425
5426 static jint initSock() {
5427 WSADATA wsadata;
5428
5429 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5430 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5431 ::GetLastError());
5432 return JNI_ERR;
5433 }
5434 return JNI_OK;
5435 }
5436
5437 struct hostent* os::get_host_by_name(char* name) {
5438 return (struct hostent*)gethostbyname(name);
5439 }
5440
5441 int os::socket_close(int fd) {
5442 return ::closesocket(fd);
5443 }
5444
5445 int os::socket(int domain, int type, int protocol) {
5446 return ::socket(domain, type, protocol);
5447 }
5448
5449 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5450 return ::connect(fd, him, len);
5451 }
5452
5453 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5454 return ::recv(fd, buf, (int)nBytes, flags);
5455 }
5456
5457 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5458 return ::send(fd, buf, (int)nBytes, flags);
5459 }
5460
5461 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5462 return ::send(fd, buf, (int)nBytes, flags);
5463 }
5464
5465 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5466 #if defined(IA32)
5467 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5468 #elif defined (AMD64)
5469 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5470 #endif
5471
5472 // returns true if thread could be suspended,
5473 // false otherwise
5474 static bool do_suspend(HANDLE* h) {
5475 if (h != NULL) {
5476 if (SuspendThread(*h) != ~0) {
5477 return true;
5478 }
5479 }
5480 return false;
5481 }
5482
5483 // resume the thread
5484 // calling resume on an active thread is a no-op
5485 static void do_resume(HANDLE* h) {
5486 if (h != NULL) {
5487 ResumeThread(*h);
5488 }
5489 }
5490
5491 // retrieve a suspend/resume context capable handle
5492 // from the tid. Caller validates handle return value.
5493 void get_thread_handle_for_extended_context(HANDLE* h,
5494 OSThread::thread_id_t tid) {
5495 if (h != NULL) {
5496 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5497 }
5498 }
5499
5500 // Thread sampling implementation
5501 //
5502 void os::SuspendedThreadTask::internal_do_task() {
5503 CONTEXT ctxt;
5504 HANDLE h = NULL;
5505
5506 // get context capable handle for thread
5507 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5508
5509 // sanity
5510 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5511 return;
5512 }
5513
5514 // suspend the thread
5515 if (do_suspend(&h)) {
5516 ctxt.ContextFlags = sampling_context_flags;
5517 // get thread context
5518 GetThreadContext(h, &ctxt);
5519 SuspendedThreadTaskContext context(_thread, &ctxt);
5520 // pass context to Thread Sampling impl
5521 do_task(context);
5522 // resume thread
5523 do_resume(&h);
5524 }
5525
5526 // close handle
5527 CloseHandle(h);
5528 }
5529
5530 bool os::start_debugging(char *buf, int buflen) {
5531 int len = (int)strlen(buf);
5532 char *p = &buf[len];
5533
5534 jio_snprintf(p, buflen-len,
5535 "\n\n"
5536 "Do you want to debug the problem?\n\n"
5537 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5538 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5539 "Otherwise, select 'No' to abort...",
5540 os::current_process_id(), os::current_thread_id());
5541
5542 bool yes = os::message_box("Unexpected Error", buf);
5543
5544 if (yes) {
5545 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5546 // exception. If VM is running inside a debugger, the debugger will
5547 // catch the exception. Otherwise, the breakpoint exception will reach
5548 // the default windows exception handler, which can spawn a debugger and
5549 // automatically attach to the dying VM.
5550 os::breakpoint();
5551 yes = false;
5552 }
5553 return yes;
5554 }
5555
5556 void* os::get_default_process_handle() {
5557 return (void*)GetModuleHandle(NULL);
5558 }
5559
5560 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5561 // which is used to find statically linked in agents.
5562 // Additionally for windows, takes into account __stdcall names.
5563 // Parameters:
5564 // sym_name: Symbol in library we are looking for
5565 // lib_name: Name of library to look in, NULL for shared libs.
5566 // is_absolute_path == true if lib_name is absolute path to agent
5567 // such as "C:/a/b/L.dll"
5568 // == false if only the base name of the library is passed in
5569 // such as "L"
5570 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5571 bool is_absolute_path) {
5572 char *agent_entry_name;
5573 size_t len;
5574 size_t name_len;
5575 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5576 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5577 const char *start;
5578
5579 if (lib_name != NULL) {
5580 len = name_len = strlen(lib_name);
5581 if (is_absolute_path) {
5582 // Need to strip path, prefix and suffix
5583 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5584 lib_name = ++start;
5585 } else {
5586 // Need to check for drive prefix
5587 if ((start = strchr(lib_name, ':')) != NULL) {
5588 lib_name = ++start;
5589 }
5590 }
5591 if (len <= (prefix_len + suffix_len)) {
5592 return NULL;
5593 }
5594 lib_name += prefix_len;
5595 name_len = strlen(lib_name) - suffix_len;
5596 }
5597 }
5598 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5599 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5600 if (agent_entry_name == NULL) {
5601 return NULL;
5602 }
5603 if (lib_name != NULL) {
5604 const char *p = strrchr(sym_name, '@');
5605 if (p != NULL && p != sym_name) {
5606 // sym_name == _Agent_OnLoad@XX
5607 strncpy(agent_entry_name, sym_name, (p - sym_name));
5608 agent_entry_name[(p-sym_name)] = '\0';
5609 // agent_entry_name == _Agent_OnLoad
5610 strcat(agent_entry_name, "_");
5611 strncat(agent_entry_name, lib_name, name_len);
5612 strcat(agent_entry_name, p);
5613 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5614 } else {
5615 strcpy(agent_entry_name, sym_name);
5616 strcat(agent_entry_name, "_");
5617 strncat(agent_entry_name, lib_name, name_len);
5618 }
5619 } else {
5620 strcpy(agent_entry_name, sym_name);
5621 }
5622 return agent_entry_name;
5623 }
5624
5625 #ifndef PRODUCT
5626
5627 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5628 // contiguous memory block at a particular address.
5629 // The test first tries to find a good approximate address to allocate at by using the same
5630 // method to allocate some memory at any address. The test then tries to allocate memory in
5631 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5632 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5633 // the previously allocated memory is available for allocation. The only actual failure
5634 // that is reported is when the test tries to allocate at a particular location but gets a
5635 // different valid one. A NULL return value at this point is not considered an error but may
5636 // be legitimate.
5637 void TestReserveMemorySpecial_test() {
5638 if (!UseLargePages) {
5639 return;
5640 }
5641 // save current value of globals
5642 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5643 bool old_use_numa_interleaving = UseNUMAInterleaving;
5644
5645 // set globals to make sure we hit the correct code path
5646 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5647
5648 // do an allocation at an address selected by the OS to get a good one.
5649 const size_t large_allocation_size = os::large_page_size() * 4;
5650 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5651 if (result == NULL) {
5652 } else {
5653 os::release_memory_special(result, large_allocation_size);
5654
5655 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5656 // we managed to get it once.
5657 const size_t expected_allocation_size = os::large_page_size();
5658 char* expected_location = result + os::large_page_size();
5659 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5660 if (actual_location == NULL) {
5661 } else {
5662 // release memory
5663 os::release_memory_special(actual_location, expected_allocation_size);
5664 // only now check, after releasing any memory to avoid any leaks.
5665 assert(actual_location == expected_location,
5666 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5667 expected_location, expected_allocation_size, actual_location);
5668 }
5669 }
5670
5671 // restore globals
5672 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5673 UseNUMAInterleaving = old_use_numa_interleaving;
5674 }
5675 #endif // PRODUCT
5676
5677 /*
5678 All the defined signal names for Windows.
5679
5680 NOTE that not all of these names are accepted by FindSignal!
5681
5682 For various reasons some of these may be rejected at runtime.
5683
5684 Here are the names currently accepted by a user of sun.misc.Signal with
5685 1.4.1 (ignoring potential interaction with use of chaining, etc):
5686
5687 (LIST TBD)
5688
5689 */
5690 int os::get_signal_number(const char* name) {
5691 static const struct {
5692 const char* name;
5693 int number;
5694 } siglabels [] =
5695 // derived from version 6.0 VC98/include/signal.h
5696 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5697 "FPE", SIGFPE, // floating point exception
5698 "SEGV", SIGSEGV, // segment violation
5699 "INT", SIGINT, // interrupt
5700 "TERM", SIGTERM, // software term signal from kill
5701 "BREAK", SIGBREAK, // Ctrl-Break sequence
5702 "ILL", SIGILL}; // illegal instruction
5703 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5704 if (strcmp(name, siglabels[i].name) == 0) {
5705 return siglabels[i].number;
5706 }
5707 }
5708 return -1;
5709 }
5710
5711 // Fast current thread access
5712
5713 int os::win32::_thread_ptr_offset = 0;
5714
5715 static void call_wrapper_dummy() {}
5716
5717 // We need to call the os_exception_wrapper once so that it sets
5718 // up the offset from FS of the thread pointer.
5719 void os::win32::initialize_thread_ptr_offset() {
5720 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5721 NULL, NULL, NULL, NULL);
5722 }
5723
5724 bool os::supports_map_sync() {
5725 return false;
5726 }