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