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