1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84
85 #include <windows.h>
86 #include <sys/types.h>
87 #include <sys/stat.h>
88 #include <sys/timeb.h>
89 #include <objidl.h>
90 #include <shlobj.h>
91
92 #include <malloc.h>
93 #include <signal.h>
94 #include <direct.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <io.h>
98 #include <process.h> // For _beginthreadex(), _endthreadex()
99 #include <imagehlp.h> // For os::dll_address_to_function_name
100 // for enumerating dll libraries
101 #include <vdmdbg.h>
102 #include <psapi.h>
103 #include <mmsystem.h>
104 #include <winsock2.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(-1)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _M_AMD64
124 #define __CPU__ amd64
125 #else
126 #define __CPU__ i486
127 #endif
128
129 #if INCLUDE_AOT
130 PVOID topLevelVectoredExceptionHandler = NULL;
131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
132 #endif
133
134 // save DLL module handle, used by GetModuleFileName
135
136 HINSTANCE vm_lib_handle;
137
138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
139 switch (reason) {
140 case DLL_PROCESS_ATTACH:
141 vm_lib_handle = hinst;
142 if (ForceTimeHighResolution) {
143 timeBeginPeriod(1L);
144 }
145 WindowsDbgHelp::pre_initialize();
146 SymbolEngine::pre_initialize();
147 break;
148 case DLL_PROCESS_DETACH:
149 if (ForceTimeHighResolution) {
150 timeEndPeriod(1L);
151 }
152 #if INCLUDE_AOT
153 if (topLevelVectoredExceptionHandler != NULL) {
154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
155 topLevelVectoredExceptionHandler = NULL;
156 }
157 #endif
158 break;
159 default:
160 break;
161 }
162 return true;
163 }
164
165 static inline double fileTimeAsDouble(FILETIME* time) {
166 const double high = (double) ((unsigned int) ~0);
167 const double split = 10000000.0;
168 double result = (time->dwLowDateTime / split) +
169 time->dwHighDateTime * (high/split);
170 return result;
171 }
172
173 // Implementation of os
174
175 bool os::unsetenv(const char* name) {
176 assert(name != NULL, "Null pointer");
177 return (SetEnvironmentVariable(name, NULL) == TRUE);
178 }
179
180 // No setuid programs under Windows.
181 bool os::have_special_privileges() {
182 return false;
183 }
184
185
186 // This method is a periodic task to check for misbehaving JNI applications
187 // under CheckJNI, we can add any periodic checks here.
188 // For Windows at the moment does nothing
189 void os::run_periodic_checks() {
190 return;
191 }
192
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197
198 void os::init_system_properties_values() {
199 // sysclasspath, java_home, dll_dir
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 const char *bin = "\\bin";
205 char home_dir[MAX_PATH + 1];
206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
207
208 if (alt_home_dir != NULL) {
209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
210 home_dir[MAX_PATH] = '\0';
211 } else {
212 os::jvm_path(home_dir, sizeof(home_dir));
213 // Found the full path to jvm.dll.
214 // Now cut the path to <java_home>/jre if we can.
215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \{client|server}
219 pslash = strrchr(home_dir, '\\');
220 if (pslash != NULL) {
221 *pslash = '\0'; // get rid of \bin
222 }
223 }
224 }
225
226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
227 strcpy(home_path, home_dir);
228 Arguments::set_java_home(home_path);
229 FREE_C_HEAP_ARRAY(char, home_path);
230
231 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
232 mtInternal);
233 strcpy(dll_path, home_dir);
234 strcat(dll_path, bin);
235 Arguments::set_dll_dir(dll_path);
236 FREE_C_HEAP_ARRAY(char, dll_path);
237
238 if (!set_boot_path('\\', ';')) {
239 vm_exit_during_initialization("Failed setting boot class path.", NULL);
240 }
241 }
242
243 // library_path
244 #define EXT_DIR "\\lib\\ext"
245 #define BIN_DIR "\\bin"
246 #define PACKAGE_DIR "\\Sun\\Java"
247 {
248 // Win32 library search order (See the documentation for LoadLibrary):
249 //
250 // 1. The directory from which application is loaded.
251 // 2. The system wide Java Extensions directory (Java only)
252 // 3. System directory (GetSystemDirectory)
253 // 4. Windows directory (GetWindowsDirectory)
254 // 5. The PATH environment variable
255 // 6. The current directory
256
257 char *library_path;
258 char tmp[MAX_PATH];
259 char *path_str = ::getenv("PATH");
260
261 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
262 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
263
264 library_path[0] = '\0';
265
266 GetModuleFileName(NULL, tmp, sizeof(tmp));
267 *(strrchr(tmp, '\\')) = '\0';
268 strcat(library_path, tmp);
269
270 GetWindowsDirectory(tmp, sizeof(tmp));
271 strcat(library_path, ";");
272 strcat(library_path, tmp);
273 strcat(library_path, PACKAGE_DIR BIN_DIR);
274
275 GetSystemDirectory(tmp, sizeof(tmp));
276 strcat(library_path, ";");
277 strcat(library_path, tmp);
278
279 GetWindowsDirectory(tmp, sizeof(tmp));
280 strcat(library_path, ";");
281 strcat(library_path, tmp);
282
283 if (path_str) {
284 strcat(library_path, ";");
285 strcat(library_path, path_str);
286 }
287
288 strcat(library_path, ";.");
289
290 Arguments::set_library_path(library_path);
291 FREE_C_HEAP_ARRAY(char, library_path);
292 }
293
294 // Default extensions directory
295 {
296 char path[MAX_PATH];
297 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
298 GetWindowsDirectory(path, MAX_PATH);
299 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
300 path, PACKAGE_DIR, EXT_DIR);
301 Arguments::set_ext_dirs(buf);
302 }
303 #undef EXT_DIR
304 #undef BIN_DIR
305 #undef PACKAGE_DIR
306
307 #ifndef _WIN64
308 // set our UnhandledExceptionFilter and save any previous one
309 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
310 #endif
311
312 // Done
313 return;
314 }
315
316 void os::breakpoint() {
317 DebugBreak();
318 }
319
320 // Invoked from the BREAKPOINT Macro
321 extern "C" void breakpoint() {
322 os::breakpoint();
323 }
324
325 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
326 // So far, this method is only used by Native Memory Tracking, which is
327 // only supported on Windows XP or later.
328 //
329 int os::get_native_stack(address* stack, int frames, int toSkip) {
330 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
331 for (int index = captured; index < frames; index ++) {
332 stack[index] = NULL;
333 }
334 return captured;
335 }
336
337
338 // os::current_stack_base()
339 //
340 // Returns the base of the stack, which is the stack's
341 // starting address. This function must be called
342 // while running on the stack of the thread being queried.
343
344 address os::current_stack_base() {
345 MEMORY_BASIC_INFORMATION minfo;
346 address stack_bottom;
347 size_t stack_size;
348
349 VirtualQuery(&minfo, &minfo, sizeof(minfo));
350 stack_bottom = (address)minfo.AllocationBase;
351 stack_size = minfo.RegionSize;
352
353 // Add up the sizes of all the regions with the same
354 // AllocationBase.
355 while (1) {
356 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
357 if (stack_bottom == (address)minfo.AllocationBase) {
358 stack_size += minfo.RegionSize;
359 } else {
360 break;
361 }
362 }
363 return stack_bottom + stack_size;
364 }
365
366 size_t os::current_stack_size() {
367 size_t sz;
368 MEMORY_BASIC_INFORMATION minfo;
369 VirtualQuery(&minfo, &minfo, sizeof(minfo));
370 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
371 return sz;
372 }
373
374 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
375 MEMORY_BASIC_INFORMATION minfo;
376 committed_start = NULL;
377 committed_size = 0;
378 address top = start + size;
379 const address start_addr = start;
380 while (start < top) {
381 VirtualQuery(start, &minfo, sizeof(minfo));
382 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
383 if (committed_start != NULL) {
384 break;
385 }
386 } else { // committed
387 if (committed_start == NULL) {
388 committed_start = start;
389 }
390 size_t offset = start - (address)minfo.BaseAddress;
391 committed_size += minfo.RegionSize - offset;
392 }
393 start = (address)minfo.BaseAddress + minfo.RegionSize;
394 }
395
396 if (committed_start == NULL) {
397 assert(committed_size == 0, "Sanity");
398 return false;
399 } else {
400 assert(committed_start >= start_addr && committed_start < top, "Out of range");
401 // current region may go beyond the limit, trim to the limit
402 committed_size = MIN2(committed_size, size_t(top - committed_start));
403 return true;
404 }
405 }
406
407 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
408 const struct tm* time_struct_ptr = localtime(clock);
409 if (time_struct_ptr != NULL) {
410 *res = *time_struct_ptr;
411 return res;
412 }
413 return NULL;
414 }
415
416 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
417 const struct tm* time_struct_ptr = gmtime(clock);
418 if (time_struct_ptr != NULL) {
419 *res = *time_struct_ptr;
420 return res;
421 }
422 return NULL;
423 }
424
425 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
426
427 // Thread start routine for all newly created threads
428 static unsigned __stdcall thread_native_entry(Thread* thread) {
429
430 thread->record_stack_base_and_size();
431
432 // Try to randomize the cache line index of hot stack frames.
433 // This helps when threads of the same stack traces evict each other's
434 // cache lines. The threads can be either from the same JVM instance, or
435 // from different JVM instances. The benefit is especially true for
436 // processors with hyperthreading technology.
437 static int counter = 0;
438 int pid = os::current_process_id();
439 _alloca(((pid ^ counter++) & 7) * 128);
440
441 thread->initialize_thread_current();
442
443 OSThread* osthr = thread->osthread();
444 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
445
446 if (UseNUMA) {
447 int lgrp_id = os::numa_get_group_id();
448 if (lgrp_id != -1) {
449 thread->set_lgrp_id(lgrp_id);
450 }
451 }
452
453 // Diagnostic code to investigate JDK-6573254
454 int res = 30115; // non-java thread
455 if (thread->is_Java_thread()) {
456 res = 20115; // java thread
457 }
458
459 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
460
461 // Install a win32 structured exception handler around every thread created
462 // by VM, so VM can generate error dump when an exception occurred in non-
463 // Java thread (e.g. VM thread).
464 __try {
465 thread->call_run();
466 } __except(topLevelExceptionFilter(
467 (_EXCEPTION_POINTERS*)_exception_info())) {
468 // Nothing to do.
469 }
470
471 // Note: at this point the thread object may already have deleted itself.
472 // Do not dereference it from here on out.
473
474 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
475
476 // One less thread is executing
477 // When the VMThread gets here, the main thread may have already exited
478 // which frees the CodeHeap containing the Atomic::add code
479 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
480 Atomic::dec(&os::win32::_os_thread_count);
481 }
482
483 // Thread must not return from exit_process_or_thread(), but if it does,
484 // let it proceed to exit normally
485 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
486 }
487
488 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
489 int thread_id) {
490 // Allocate the OSThread object
491 OSThread* osthread = new OSThread(NULL, NULL);
492 if (osthread == NULL) return NULL;
493
494 // Initialize the JDK library's interrupt event.
495 // This should really be done when OSThread is constructed,
496 // but there is no way for a constructor to report failure to
497 // allocate the event.
498 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
499 if (interrupt_event == NULL) {
500 delete osthread;
501 return NULL;
502 }
503 osthread->set_interrupt_event(interrupt_event);
504
505 // Store info on the Win32 thread into the OSThread
506 osthread->set_thread_handle(thread_handle);
507 osthread->set_thread_id(thread_id);
508
509 if (UseNUMA) {
510 int lgrp_id = os::numa_get_group_id();
511 if (lgrp_id != -1) {
512 thread->set_lgrp_id(lgrp_id);
513 }
514 }
515
516 // Initial thread state is INITIALIZED, not SUSPENDED
517 osthread->set_state(INITIALIZED);
518
519 return osthread;
520 }
521
522
523 bool os::create_attached_thread(JavaThread* thread) {
524 #ifdef ASSERT
525 thread->verify_not_published();
526 #endif
527 HANDLE thread_h;
528 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
529 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
530 fatal("DuplicateHandle failed\n");
531 }
532 OSThread* osthread = create_os_thread(thread, thread_h,
533 (int)current_thread_id());
534 if (osthread == NULL) {
535 return false;
536 }
537
538 // Initial thread state is RUNNABLE
539 osthread->set_state(RUNNABLE);
540
541 thread->set_osthread(osthread);
542
543 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
544 os::current_thread_id());
545
546 return true;
547 }
548
549 bool os::create_main_thread(JavaThread* thread) {
550 #ifdef ASSERT
551 thread->verify_not_published();
552 #endif
553 if (_starting_thread == NULL) {
554 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
555 if (_starting_thread == NULL) {
556 return false;
557 }
558 }
559
560 // The primordial thread is runnable from the start)
561 _starting_thread->set_state(RUNNABLE);
562
563 thread->set_osthread(_starting_thread);
564 return true;
565 }
566
567 // Helper function to trace _beginthreadex attributes,
568 // similar to os::Posix::describe_pthread_attr()
569 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
570 size_t stacksize, unsigned initflag) {
571 stringStream ss(buf, buflen);
572 if (stacksize == 0) {
573 ss.print("stacksize: default, ");
574 } else {
575 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
576 }
577 ss.print("flags: ");
578 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
579 #define ALL(X) \
580 X(CREATE_SUSPENDED) \
581 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
582 ALL(PRINT_FLAG)
583 #undef ALL
584 #undef PRINT_FLAG
585 return buf;
586 }
587
588 // Allocate and initialize a new OSThread
589 bool os::create_thread(Thread* thread, ThreadType thr_type,
590 size_t stack_size) {
591 unsigned thread_id;
592
593 // Allocate the OSThread object
594 OSThread* osthread = new OSThread(NULL, NULL);
595 if (osthread == NULL) {
596 return false;
597 }
598
599 // Initialize the JDK library's interrupt event.
600 // This should really be done when OSThread is constructed,
601 // but there is no way for a constructor to report failure to
602 // allocate the event.
603 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
604 if (interrupt_event == NULL) {
605 delete osthread;
606 return false;
607 }
608 osthread->set_interrupt_event(interrupt_event);
609 // We don't call set_interrupted(false) as it will trip the assert in there
610 // as we are not operating on the current thread. We don't need to call it
611 // because the initial state is already correct.
612
613 thread->set_osthread(osthread);
614
615 if (stack_size == 0) {
616 switch (thr_type) {
617 case os::java_thread:
618 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
619 if (JavaThread::stack_size_at_create() > 0) {
620 stack_size = JavaThread::stack_size_at_create();
621 }
622 break;
623 case os::compiler_thread:
624 if (CompilerThreadStackSize > 0) {
625 stack_size = (size_t)(CompilerThreadStackSize * K);
626 break;
627 } // else fall through:
628 // use VMThreadStackSize if CompilerThreadStackSize is not defined
629 case os::vm_thread:
630 case os::pgc_thread:
631 case os::cgc_thread:
632 case os::watcher_thread:
633 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
634 break;
635 }
636 }
637
638 // Create the Win32 thread
639 //
640 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
641 // does not specify stack size. Instead, it specifies the size of
642 // initially committed space. The stack size is determined by
643 // PE header in the executable. If the committed "stack_size" is larger
644 // than default value in the PE header, the stack is rounded up to the
645 // nearest multiple of 1MB. For example if the launcher has default
646 // stack size of 320k, specifying any size less than 320k does not
647 // affect the actual stack size at all, it only affects the initial
648 // commitment. On the other hand, specifying 'stack_size' larger than
649 // default value may cause significant increase in memory usage, because
650 // not only the stack space will be rounded up to MB, but also the
651 // entire space is committed upfront.
652 //
653 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
654 // for CreateThread() that can treat 'stack_size' as stack size. However we
655 // are not supposed to call CreateThread() directly according to MSDN
656 // document because JVM uses C runtime library. The good news is that the
657 // flag appears to work with _beginthredex() as well.
658
659 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
660 HANDLE thread_handle =
661 (HANDLE)_beginthreadex(NULL,
662 (unsigned)stack_size,
663 (unsigned (__stdcall *)(void*)) thread_native_entry,
664 thread,
665 initflag,
666 &thread_id);
667
668 char buf[64];
669 if (thread_handle != NULL) {
670 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
671 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
672 } else {
673 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
674 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
675 // Log some OS information which might explain why creating the thread failed.
676 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
677 LogStream st(Log(os, thread)::info());
678 os::print_memory_info(&st);
679 }
680
681 if (thread_handle == NULL) {
682 // Need to clean up stuff we've allocated so far
683 thread->set_osthread(NULL);
684 delete osthread;
685 return false;
686 }
687
688 Atomic::inc(&os::win32::_os_thread_count);
689
690 // Store info on the Win32 thread into the OSThread
691 osthread->set_thread_handle(thread_handle);
692 osthread->set_thread_id(thread_id);
693
694 // Initial thread state is INITIALIZED, not SUSPENDED
695 osthread->set_state(INITIALIZED);
696
697 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
698 return true;
699 }
700
701
702 // Free Win32 resources related to the OSThread
703 void os::free_thread(OSThread* osthread) {
704 assert(osthread != NULL, "osthread not set");
705
706 // We are told to free resources of the argument thread,
707 // but we can only really operate on the current thread.
708 assert(Thread::current()->osthread() == osthread,
709 "os::free_thread but not current thread");
710
711 CloseHandle(osthread->thread_handle());
712 delete osthread;
713 }
714
715 static jlong first_filetime;
716 static jlong initial_performance_count;
717 static jlong performance_frequency;
718
719
720 jlong as_long(LARGE_INTEGER x) {
721 jlong result = 0; // initialization to avoid warning
722 set_high(&result, x.HighPart);
723 set_low(&result, x.LowPart);
724 return result;
725 }
726
727
728 jlong os::elapsed_counter() {
729 LARGE_INTEGER count;
730 QueryPerformanceCounter(&count);
731 return as_long(count) - initial_performance_count;
732 }
733
734
735 jlong os::elapsed_frequency() {
736 return performance_frequency;
737 }
738
739
740 julong os::available_memory() {
741 return win32::available_memory();
742 }
743
744 julong os::win32::available_memory() {
745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
746 // value if total memory is larger than 4GB
747 MEMORYSTATUSEX ms;
748 ms.dwLength = sizeof(ms);
749 GlobalMemoryStatusEx(&ms);
750
751 return (julong)ms.ullAvailPhys;
752 }
753
754 julong os::physical_memory() {
755 return win32::physical_memory();
756 }
757
758 bool os::has_allocatable_memory_limit(julong* limit) {
759 MEMORYSTATUSEX ms;
760 ms.dwLength = sizeof(ms);
761 GlobalMemoryStatusEx(&ms);
762 #ifdef _LP64
763 *limit = (julong)ms.ullAvailVirtual;
764 return true;
765 #else
766 // Limit to 1400m because of the 2gb address space wall
767 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
768 return true;
769 #endif
770 }
771
772 int os::active_processor_count() {
773 // User has overridden the number of active processors
774 if (ActiveProcessorCount > 0) {
775 log_trace(os)("active_processor_count: "
776 "active processor count set by user : %d",
777 ActiveProcessorCount);
778 return ActiveProcessorCount;
779 }
780
781 DWORD_PTR lpProcessAffinityMask = 0;
782 DWORD_PTR lpSystemAffinityMask = 0;
783 int proc_count = processor_count();
784 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
785 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
786 // Nof active processors is number of bits in process affinity mask
787 int bitcount = 0;
788 while (lpProcessAffinityMask != 0) {
789 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
790 bitcount++;
791 }
792 return bitcount;
793 } else {
794 return proc_count;
795 }
796 }
797
798 uint os::processor_id() {
799 return (uint)GetCurrentProcessorNumber();
800 }
801
802 void os::set_native_thread_name(const char *name) {
803
804 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
805 //
806 // Note that unfortunately this only works if the process
807 // is already attached to a debugger; debugger must observe
808 // the exception below to show the correct name.
809
810 // If there is no debugger attached skip raising the exception
811 if (!IsDebuggerPresent()) {
812 return;
813 }
814
815 const DWORD MS_VC_EXCEPTION = 0x406D1388;
816 struct {
817 DWORD dwType; // must be 0x1000
818 LPCSTR szName; // pointer to name (in user addr space)
819 DWORD dwThreadID; // thread ID (-1=caller thread)
820 DWORD dwFlags; // reserved for future use, must be zero
821 } info;
822
823 info.dwType = 0x1000;
824 info.szName = name;
825 info.dwThreadID = -1;
826 info.dwFlags = 0;
827
828 __try {
829 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
830 } __except(EXCEPTION_EXECUTE_HANDLER) {}
831 }
832
833 bool os::bind_to_processor(uint processor_id) {
834 // Not yet implemented.
835 return false;
836 }
837
838 void os::win32::initialize_performance_counter() {
839 LARGE_INTEGER count;
840 QueryPerformanceFrequency(&count);
841 performance_frequency = as_long(count);
842 QueryPerformanceCounter(&count);
843 initial_performance_count = as_long(count);
844 }
845
846
847 double os::elapsedTime() {
848 return (double) elapsed_counter() / (double) elapsed_frequency();
849 }
850
851
852 // Windows format:
853 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
854 // Java format:
855 // Java standards require the number of milliseconds since 1/1/1970
856
857 // Constant offset - calculated using offset()
858 static jlong _offset = 116444736000000000;
859 // Fake time counter for reproducible results when debugging
860 static jlong fake_time = 0;
861
862 #ifdef ASSERT
863 // Just to be safe, recalculate the offset in debug mode
864 static jlong _calculated_offset = 0;
865 static int _has_calculated_offset = 0;
866
867 jlong offset() {
868 if (_has_calculated_offset) return _calculated_offset;
869 SYSTEMTIME java_origin;
870 java_origin.wYear = 1970;
871 java_origin.wMonth = 1;
872 java_origin.wDayOfWeek = 0; // ignored
873 java_origin.wDay = 1;
874 java_origin.wHour = 0;
875 java_origin.wMinute = 0;
876 java_origin.wSecond = 0;
877 java_origin.wMilliseconds = 0;
878 FILETIME jot;
879 if (!SystemTimeToFileTime(&java_origin, &jot)) {
880 fatal("Error = %d\nWindows error", GetLastError());
881 }
882 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
883 _has_calculated_offset = 1;
884 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
885 return _calculated_offset;
886 }
887 #else
888 jlong offset() {
889 return _offset;
890 }
891 #endif
892
893 jlong windows_to_java_time(FILETIME wt) {
894 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
895 return (a - offset()) / 10000;
896 }
897
898 // Returns time ticks in (10th of micro seconds)
899 jlong windows_to_time_ticks(FILETIME wt) {
900 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
901 return (a - offset());
902 }
903
904 FILETIME java_to_windows_time(jlong l) {
905 jlong a = (l * 10000) + offset();
906 FILETIME result;
907 result.dwHighDateTime = high(a);
908 result.dwLowDateTime = low(a);
909 return result;
910 }
911
912 bool os::supports_vtime() { return true; }
913
914 double os::elapsedVTime() {
915 FILETIME created;
916 FILETIME exited;
917 FILETIME kernel;
918 FILETIME user;
919 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
920 // the resolution of windows_to_java_time() should be sufficient (ms)
921 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
922 } else {
923 return elapsedTime();
924 }
925 }
926
927 jlong os::javaTimeMillis() {
928 FILETIME wt;
929 GetSystemTimeAsFileTime(&wt);
930 return windows_to_java_time(wt);
931 }
932
933 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
934 FILETIME wt;
935 GetSystemTimeAsFileTime(&wt);
936 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
937 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
938 seconds = secs;
939 nanos = jlong(ticks - (secs*10000000)) * 100;
940 }
941
942 jlong os::javaTimeNanos() {
943 LARGE_INTEGER current_count;
944 QueryPerformanceCounter(¤t_count);
945 double current = as_long(current_count);
946 double freq = performance_frequency;
947 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
948 return time;
949 }
950
951 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
952 jlong freq = performance_frequency;
953 if (freq < NANOSECS_PER_SEC) {
954 // the performance counter is 64 bits and we will
955 // be multiplying it -- so no wrap in 64 bits
956 info_ptr->max_value = ALL_64_BITS;
957 } else if (freq > NANOSECS_PER_SEC) {
958 // use the max value the counter can reach to
959 // determine the max value which could be returned
960 julong max_counter = (julong)ALL_64_BITS;
961 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
962 } else {
963 // the performance counter is 64 bits and we will
964 // be using it directly -- so no wrap in 64 bits
965 info_ptr->max_value = ALL_64_BITS;
966 }
967
968 // using a counter, so no skipping
969 info_ptr->may_skip_backward = false;
970 info_ptr->may_skip_forward = false;
971
972 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
973 }
974
975 char* os::local_time_string(char *buf, size_t buflen) {
976 SYSTEMTIME st;
977 GetLocalTime(&st);
978 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
979 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
980 return buf;
981 }
982
983 bool os::getTimesSecs(double* process_real_time,
984 double* process_user_time,
985 double* process_system_time) {
986 HANDLE h_process = GetCurrentProcess();
987 FILETIME create_time, exit_time, kernel_time, user_time;
988 BOOL result = GetProcessTimes(h_process,
989 &create_time,
990 &exit_time,
991 &kernel_time,
992 &user_time);
993 if (result != 0) {
994 FILETIME wt;
995 GetSystemTimeAsFileTime(&wt);
996 jlong rtc_millis = windows_to_java_time(wt);
997 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
998 *process_user_time =
999 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1000 *process_system_time =
1001 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1002 return true;
1003 } else {
1004 return false;
1005 }
1006 }
1007
1008 void os::shutdown() {
1009 // allow PerfMemory to attempt cleanup of any persistent resources
1010 perfMemory_exit();
1011
1012 // flush buffered output, finish log files
1013 ostream_abort();
1014
1015 // Check for abort hook
1016 abort_hook_t abort_hook = Arguments::abort_hook();
1017 if (abort_hook != NULL) {
1018 abort_hook();
1019 }
1020 }
1021
1022
1023 static HANDLE dumpFile = NULL;
1024
1025 // Check if dump file can be created.
1026 void os::check_dump_limit(char* buffer, size_t buffsz) {
1027 bool status = true;
1028 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1029 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1030 status = false;
1031 }
1032
1033 #ifndef ASSERT
1034 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1035 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1036 status = false;
1037 }
1038 #endif
1039
1040 if (status) {
1041 const char* cwd = get_current_directory(NULL, 0);
1042 int pid = current_process_id();
1043 if (cwd != NULL) {
1044 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1045 } else {
1046 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1047 }
1048
1049 if (dumpFile == NULL &&
1050 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1051 == INVALID_HANDLE_VALUE) {
1052 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1053 status = false;
1054 }
1055 }
1056 VMError::record_coredump_status(buffer, status);
1057 }
1058
1059 void os::abort(bool dump_core, void* siginfo, const void* context) {
1060 EXCEPTION_POINTERS ep;
1061 MINIDUMP_EXCEPTION_INFORMATION mei;
1062 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1063
1064 HANDLE hProcess = GetCurrentProcess();
1065 DWORD processId = GetCurrentProcessId();
1066 MINIDUMP_TYPE dumpType;
1067
1068 shutdown();
1069 if (!dump_core || dumpFile == NULL) {
1070 if (dumpFile != NULL) {
1071 CloseHandle(dumpFile);
1072 }
1073 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1074 }
1075
1076 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1077 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1078
1079 if (siginfo != NULL && context != NULL) {
1080 ep.ContextRecord = (PCONTEXT) context;
1081 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1082
1083 mei.ThreadId = GetCurrentThreadId();
1084 mei.ExceptionPointers = &ep;
1085 pmei = &mei;
1086 } else {
1087 pmei = NULL;
1088 }
1089
1090 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1091 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1092 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1093 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1094 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1095 }
1096 CloseHandle(dumpFile);
1097 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1098 }
1099
1100 // Die immediately, no exit hook, no abort hook, no cleanup.
1101 void os::die() {
1102 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1103 }
1104
1105 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1106 // * dirent_md.c 1.15 00/02/02
1107 //
1108 // The declarations for DIR and struct dirent are in jvm_win32.h.
1109
1110 // Caller must have already run dirname through JVM_NativePath, which removes
1111 // duplicate slashes and converts all instances of '/' into '\\'.
1112
1113 DIR * os::opendir(const char *dirname) {
1114 assert(dirname != NULL, "just checking"); // hotspot change
1115 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1116 DWORD fattr; // hotspot change
1117 char alt_dirname[4] = { 0, 0, 0, 0 };
1118
1119 if (dirp == 0) {
1120 errno = ENOMEM;
1121 return 0;
1122 }
1123
1124 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1125 // as a directory in FindFirstFile(). We detect this case here and
1126 // prepend the current drive name.
1127 //
1128 if (dirname[1] == '\0' && dirname[0] == '\\') {
1129 alt_dirname[0] = _getdrive() + 'A' - 1;
1130 alt_dirname[1] = ':';
1131 alt_dirname[2] = '\\';
1132 alt_dirname[3] = '\0';
1133 dirname = alt_dirname;
1134 }
1135
1136 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1137 if (dirp->path == 0) {
1138 free(dirp);
1139 errno = ENOMEM;
1140 return 0;
1141 }
1142 strcpy(dirp->path, dirname);
1143
1144 fattr = GetFileAttributes(dirp->path);
1145 if (fattr == 0xffffffff) {
1146 free(dirp->path);
1147 free(dirp);
1148 errno = ENOENT;
1149 return 0;
1150 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1151 free(dirp->path);
1152 free(dirp);
1153 errno = ENOTDIR;
1154 return 0;
1155 }
1156
1157 // Append "*.*", or possibly "\\*.*", to path
1158 if (dirp->path[1] == ':' &&
1159 (dirp->path[2] == '\0' ||
1160 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1161 // No '\\' needed for cases like "Z:" or "Z:\"
1162 strcat(dirp->path, "*.*");
1163 } else {
1164 strcat(dirp->path, "\\*.*");
1165 }
1166
1167 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1168 if (dirp->handle == INVALID_HANDLE_VALUE) {
1169 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1170 free(dirp->path);
1171 free(dirp);
1172 errno = EACCES;
1173 return 0;
1174 }
1175 }
1176 return dirp;
1177 }
1178
1179 struct dirent * os::readdir(DIR *dirp) {
1180 assert(dirp != NULL, "just checking"); // hotspot change
1181 if (dirp->handle == INVALID_HANDLE_VALUE) {
1182 return NULL;
1183 }
1184
1185 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1186
1187 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1188 if (GetLastError() == ERROR_INVALID_HANDLE) {
1189 errno = EBADF;
1190 return NULL;
1191 }
1192 FindClose(dirp->handle);
1193 dirp->handle = INVALID_HANDLE_VALUE;
1194 }
1195
1196 return &dirp->dirent;
1197 }
1198
1199 int os::closedir(DIR *dirp) {
1200 assert(dirp != NULL, "just checking"); // hotspot change
1201 if (dirp->handle != INVALID_HANDLE_VALUE) {
1202 if (!FindClose(dirp->handle)) {
1203 errno = EBADF;
1204 return -1;
1205 }
1206 dirp->handle = INVALID_HANDLE_VALUE;
1207 }
1208 free(dirp->path);
1209 free(dirp);
1210 return 0;
1211 }
1212
1213 // This must be hard coded because it's the system's temporary
1214 // directory not the java application's temp directory, ala java.io.tmpdir.
1215 const char* os::get_temp_directory() {
1216 static char path_buf[MAX_PATH];
1217 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1218 return path_buf;
1219 } else {
1220 path_buf[0] = '\0';
1221 return path_buf;
1222 }
1223 }
1224
1225 // Needs to be in os specific directory because windows requires another
1226 // header file <direct.h>
1227 const char* os::get_current_directory(char *buf, size_t buflen) {
1228 int n = static_cast<int>(buflen);
1229 if (buflen > INT_MAX) n = INT_MAX;
1230 return _getcwd(buf, n);
1231 }
1232
1233 //-----------------------------------------------------------
1234 // Helper functions for fatal error handler
1235 #ifdef _WIN64
1236 // Helper routine which returns true if address in
1237 // within the NTDLL address space.
1238 //
1239 static bool _addr_in_ntdll(address addr) {
1240 HMODULE hmod;
1241 MODULEINFO minfo;
1242
1243 hmod = GetModuleHandle("NTDLL.DLL");
1244 if (hmod == NULL) return false;
1245 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1246 &minfo, sizeof(MODULEINFO))) {
1247 return false;
1248 }
1249
1250 if ((addr >= minfo.lpBaseOfDll) &&
1251 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1252 return true;
1253 } else {
1254 return false;
1255 }
1256 }
1257 #endif
1258
1259 struct _modinfo {
1260 address addr;
1261 char* full_path; // point to a char buffer
1262 int buflen; // size of the buffer
1263 address base_addr;
1264 };
1265
1266 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1267 address top_address, void * param) {
1268 struct _modinfo *pmod = (struct _modinfo *)param;
1269 if (!pmod) return -1;
1270
1271 if (base_addr <= pmod->addr &&
1272 top_address > pmod->addr) {
1273 // if a buffer is provided, copy path name to the buffer
1274 if (pmod->full_path) {
1275 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1276 }
1277 pmod->base_addr = base_addr;
1278 return 1;
1279 }
1280 return 0;
1281 }
1282
1283 bool os::dll_address_to_library_name(address addr, char* buf,
1284 int buflen, int* offset) {
1285 // buf is not optional, but offset is optional
1286 assert(buf != NULL, "sanity check");
1287
1288 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1289 // return the full path to the DLL file, sometimes it returns path
1290 // to the corresponding PDB file (debug info); sometimes it only
1291 // returns partial path, which makes life painful.
1292
1293 struct _modinfo mi;
1294 mi.addr = addr;
1295 mi.full_path = buf;
1296 mi.buflen = buflen;
1297 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1298 // buf already contains path name
1299 if (offset) *offset = addr - mi.base_addr;
1300 return true;
1301 }
1302
1303 buf[0] = '\0';
1304 if (offset) *offset = -1;
1305 return false;
1306 }
1307
1308 bool os::dll_address_to_function_name(address addr, char *buf,
1309 int buflen, int *offset,
1310 bool demangle) {
1311 // buf is not optional, but offset is optional
1312 assert(buf != NULL, "sanity check");
1313
1314 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1315 return true;
1316 }
1317 if (offset != NULL) *offset = -1;
1318 buf[0] = '\0';
1319 return false;
1320 }
1321
1322 // save the start and end address of jvm.dll into param[0] and param[1]
1323 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1324 address top_address, void * param) {
1325 if (!param) return -1;
1326
1327 if (base_addr <= (address)_locate_jvm_dll &&
1328 top_address > (address)_locate_jvm_dll) {
1329 ((address*)param)[0] = base_addr;
1330 ((address*)param)[1] = top_address;
1331 return 1;
1332 }
1333 return 0;
1334 }
1335
1336 address vm_lib_location[2]; // start and end address of jvm.dll
1337
1338 // check if addr is inside jvm.dll
1339 bool os::address_is_in_vm(address addr) {
1340 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1341 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1342 assert(false, "Can't find jvm module.");
1343 return false;
1344 }
1345 }
1346
1347 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1348 }
1349
1350 // print module info; param is outputStream*
1351 static int _print_module(const char* fname, address base_address,
1352 address top_address, void* param) {
1353 if (!param) return -1;
1354
1355 outputStream* st = (outputStream*)param;
1356
1357 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1358 return 0;
1359 }
1360
1361 // Loads .dll/.so and
1362 // in case of error it checks if .dll/.so was built for the
1363 // same architecture as Hotspot is running on
1364 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1365 log_info(os)("attempting shared library load of %s", name);
1366
1367 void * result = LoadLibrary(name);
1368 if (result != NULL) {
1369 Events::log(NULL, "Loaded shared library %s", name);
1370 // Recalculate pdb search path if a DLL was loaded successfully.
1371 SymbolEngine::recalc_search_path();
1372 log_info(os)("shared library load of %s was successful", name);
1373 return result;
1374 }
1375 DWORD errcode = GetLastError();
1376 // Read system error message into ebuf
1377 // It may or may not be overwritten below (in the for loop and just above)
1378 lasterror(ebuf, (size_t) ebuflen);
1379 ebuf[ebuflen - 1] = '\0';
1380 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1381 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1382
1383 if (errcode == ERROR_MOD_NOT_FOUND) {
1384 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1385 ebuf[ebuflen - 1] = '\0';
1386 return NULL;
1387 }
1388
1389 // Parsing dll below
1390 // If we can read dll-info and find that dll was built
1391 // for an architecture other than Hotspot is running in
1392 // - then print to buffer "DLL was built for a different architecture"
1393 // else call os::lasterror to obtain system error message
1394 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1395 if (fd < 0) {
1396 return NULL;
1397 }
1398
1399 uint32_t signature_offset;
1400 uint16_t lib_arch = 0;
1401 bool failed_to_get_lib_arch =
1402 ( // Go to position 3c in the dll
1403 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1404 ||
1405 // Read location of signature
1406 (sizeof(signature_offset) !=
1407 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1408 ||
1409 // Go to COFF File Header in dll
1410 // that is located after "signature" (4 bytes long)
1411 (os::seek_to_file_offset(fd,
1412 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1413 ||
1414 // Read field that contains code of architecture
1415 // that dll was built for
1416 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1417 );
1418
1419 ::close(fd);
1420 if (failed_to_get_lib_arch) {
1421 // file i/o error - report os::lasterror(...) msg
1422 return NULL;
1423 }
1424
1425 typedef struct {
1426 uint16_t arch_code;
1427 char* arch_name;
1428 } arch_t;
1429
1430 static const arch_t arch_array[] = {
1431 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1432 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1433 };
1434 #if (defined _M_AMD64)
1435 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1436 #elif (defined _M_IX86)
1437 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1438 #else
1439 #error Method os::dll_load requires that one of following \
1440 is defined :_M_AMD64 or _M_IX86
1441 #endif
1442
1443
1444 // Obtain a string for printf operation
1445 // lib_arch_str shall contain string what platform this .dll was built for
1446 // running_arch_str shall string contain what platform Hotspot was built for
1447 char *running_arch_str = NULL, *lib_arch_str = NULL;
1448 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1449 if (lib_arch == arch_array[i].arch_code) {
1450 lib_arch_str = arch_array[i].arch_name;
1451 }
1452 if (running_arch == arch_array[i].arch_code) {
1453 running_arch_str = arch_array[i].arch_name;
1454 }
1455 }
1456
1457 assert(running_arch_str,
1458 "Didn't find running architecture code in arch_array");
1459
1460 // If the architecture is right
1461 // but some other error took place - report os::lasterror(...) msg
1462 if (lib_arch == running_arch) {
1463 return NULL;
1464 }
1465
1466 if (lib_arch_str != NULL) {
1467 ::_snprintf(ebuf, ebuflen - 1,
1468 "Can't load %s-bit .dll on a %s-bit platform",
1469 lib_arch_str, running_arch_str);
1470 } else {
1471 // don't know what architecture this dll was build for
1472 ::_snprintf(ebuf, ebuflen - 1,
1473 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1474 lib_arch, running_arch_str);
1475 }
1476
1477 return NULL;
1478 }
1479
1480 void os::print_dll_info(outputStream *st) {
1481 st->print_cr("Dynamic libraries:");
1482 get_loaded_modules_info(_print_module, (void *)st);
1483 }
1484
1485 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1486 HANDLE hProcess;
1487
1488 # define MAX_NUM_MODULES 128
1489 HMODULE modules[MAX_NUM_MODULES];
1490 static char filename[MAX_PATH];
1491 int result = 0;
1492
1493 int pid = os::current_process_id();
1494 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1495 FALSE, pid);
1496 if (hProcess == NULL) return 0;
1497
1498 DWORD size_needed;
1499 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1500 CloseHandle(hProcess);
1501 return 0;
1502 }
1503
1504 // number of modules that are currently loaded
1505 int num_modules = size_needed / sizeof(HMODULE);
1506
1507 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1508 // Get Full pathname:
1509 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1510 filename[0] = '\0';
1511 }
1512
1513 MODULEINFO modinfo;
1514 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1515 modinfo.lpBaseOfDll = NULL;
1516 modinfo.SizeOfImage = 0;
1517 }
1518
1519 // Invoke callback function
1520 result = callback(filename, (address)modinfo.lpBaseOfDll,
1521 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1522 if (result) break;
1523 }
1524
1525 CloseHandle(hProcess);
1526 return result;
1527 }
1528
1529 bool os::get_host_name(char* buf, size_t buflen) {
1530 DWORD size = (DWORD)buflen;
1531 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1532 }
1533
1534 void os::get_summary_os_info(char* buf, size_t buflen) {
1535 stringStream sst(buf, buflen);
1536 os::win32::print_windows_version(&sst);
1537 // chop off newline character
1538 char* nl = strchr(buf, '\n');
1539 if (nl != NULL) *nl = '\0';
1540 }
1541
1542 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1543 #if _MSC_VER >= 1900
1544 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1545 int result = ::vsnprintf(buf, len, fmt, args);
1546 // If an encoding error occurred (result < 0) then it's not clear
1547 // whether the buffer is NUL terminated, so ensure it is.
1548 if ((result < 0) && (len > 0)) {
1549 buf[len - 1] = '\0';
1550 }
1551 return result;
1552 #else
1553 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1554 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1555 // versions. However, when len == 0, avoid _vsnprintf too, and just
1556 // go straight to _vscprintf. The output is going to be truncated in
1557 // that case, except in the unusual case of empty output. More
1558 // importantly, the documentation for various versions of Visual Studio
1559 // are inconsistent about the behavior of _vsnprintf when len == 0,
1560 // including it possibly being an error.
1561 int result = -1;
1562 if (len > 0) {
1563 result = _vsnprintf(buf, len, fmt, args);
1564 // If output (including NUL terminator) is truncated, the buffer
1565 // won't be NUL terminated. Add the trailing NUL specified by C99.
1566 if ((result < 0) || ((size_t)result >= len)) {
1567 buf[len - 1] = '\0';
1568 }
1569 }
1570 if (result < 0) {
1571 result = _vscprintf(fmt, args);
1572 }
1573 return result;
1574 #endif // _MSC_VER dispatch
1575 }
1576
1577 static inline time_t get_mtime(const char* filename) {
1578 struct stat st;
1579 int ret = os::stat(filename, &st);
1580 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1581 return st.st_mtime;
1582 }
1583
1584 int os::compare_file_modified_times(const char* file1, const char* file2) {
1585 time_t t1 = get_mtime(file1);
1586 time_t t2 = get_mtime(file2);
1587 return t1 - t2;
1588 }
1589
1590 void os::print_os_info_brief(outputStream* st) {
1591 os::print_os_info(st);
1592 }
1593
1594 void os::win32::print_uptime_info(outputStream* st) {
1595 unsigned long long ticks = GetTickCount64();
1596 os::print_dhm(st, "OS uptime:", ticks/1000);
1597 }
1598
1599 void os::print_os_info(outputStream* st) {
1600 #ifdef ASSERT
1601 char buffer[1024];
1602 st->print("HostName: ");
1603 if (get_host_name(buffer, sizeof(buffer))) {
1604 st->print("%s ", buffer);
1605 } else {
1606 st->print("N/A ");
1607 }
1608 #endif
1609 st->print("OS:");
1610 os::win32::print_windows_version(st);
1611
1612 os::win32::print_uptime_info(st);
1613
1614 #ifdef _LP64
1615 VM_Version::print_platform_virtualization_info(st);
1616 #endif
1617 }
1618
1619 void os::win32::print_windows_version(outputStream* st) {
1620 OSVERSIONINFOEX osvi;
1621 VS_FIXEDFILEINFO *file_info;
1622 TCHAR kernel32_path[MAX_PATH];
1623 UINT len, ret;
1624
1625 // Use the GetVersionEx information to see if we're on a server or
1626 // workstation edition of Windows. Starting with Windows 8.1 we can't
1627 // trust the OS version information returned by this API.
1628 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1629 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1630 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1631 st->print_cr("Call to GetVersionEx failed");
1632 return;
1633 }
1634 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1635
1636 // Get the full path to \Windows\System32\kernel32.dll and use that for
1637 // determining what version of Windows we're running on.
1638 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1639 ret = GetSystemDirectory(kernel32_path, len);
1640 if (ret == 0 || ret > len) {
1641 st->print_cr("Call to GetSystemDirectory failed");
1642 return;
1643 }
1644 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1645
1646 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1647 if (version_size == 0) {
1648 st->print_cr("Call to GetFileVersionInfoSize failed");
1649 return;
1650 }
1651
1652 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1653 if (version_info == NULL) {
1654 st->print_cr("Failed to allocate version_info");
1655 return;
1656 }
1657
1658 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1659 os::free(version_info);
1660 st->print_cr("Call to GetFileVersionInfo failed");
1661 return;
1662 }
1663
1664 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1665 os::free(version_info);
1666 st->print_cr("Call to VerQueryValue failed");
1667 return;
1668 }
1669
1670 int major_version = HIWORD(file_info->dwProductVersionMS);
1671 int minor_version = LOWORD(file_info->dwProductVersionMS);
1672 int build_number = HIWORD(file_info->dwProductVersionLS);
1673 int build_minor = LOWORD(file_info->dwProductVersionLS);
1674 int os_vers = major_version * 1000 + minor_version;
1675 os::free(version_info);
1676
1677 st->print(" Windows ");
1678 switch (os_vers) {
1679
1680 case 6000:
1681 if (is_workstation) {
1682 st->print("Vista");
1683 } else {
1684 st->print("Server 2008");
1685 }
1686 break;
1687
1688 case 6001:
1689 if (is_workstation) {
1690 st->print("7");
1691 } else {
1692 st->print("Server 2008 R2");
1693 }
1694 break;
1695
1696 case 6002:
1697 if (is_workstation) {
1698 st->print("8");
1699 } else {
1700 st->print("Server 2012");
1701 }
1702 break;
1703
1704 case 6003:
1705 if (is_workstation) {
1706 st->print("8.1");
1707 } else {
1708 st->print("Server 2012 R2");
1709 }
1710 break;
1711
1712 case 10000:
1713 if (is_workstation) {
1714 st->print("10");
1715 } else {
1716 // distinguish Windows Server 2016 and 2019 by build number
1717 // Windows server 2019 GA 10/2018 build number is 17763
1718 if (build_number > 17762) {
1719 st->print("Server 2019");
1720 } else {
1721 st->print("Server 2016");
1722 }
1723 }
1724 break;
1725
1726 default:
1727 // Unrecognized windows, print out its major and minor versions
1728 st->print("%d.%d", major_version, minor_version);
1729 break;
1730 }
1731
1732 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1733 // find out whether we are running on 64 bit processor or not
1734 SYSTEM_INFO si;
1735 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1736 GetNativeSystemInfo(&si);
1737 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1738 st->print(" , 64 bit");
1739 }
1740
1741 st->print(" Build %d", build_number);
1742 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1743 st->cr();
1744 }
1745
1746 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1747 // Nothing to do for now.
1748 }
1749
1750 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1751 HKEY key;
1752 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1753 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1754 if (status == ERROR_SUCCESS) {
1755 DWORD size = (DWORD)buflen;
1756 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1757 if (status != ERROR_SUCCESS) {
1758 strncpy(buf, "## __CPU__", buflen);
1759 }
1760 RegCloseKey(key);
1761 } else {
1762 // Put generic cpu info to return
1763 strncpy(buf, "## __CPU__", buflen);
1764 }
1765 }
1766
1767 void os::print_memory_info(outputStream* st) {
1768 st->print("Memory:");
1769 st->print(" %dk page", os::vm_page_size()>>10);
1770
1771 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1772 // value if total memory is larger than 4GB
1773 MEMORYSTATUSEX ms;
1774 ms.dwLength = sizeof(ms);
1775 int r1 = GlobalMemoryStatusEx(&ms);
1776
1777 if (r1 != 0) {
1778 st->print(", system-wide physical " INT64_FORMAT "M ",
1779 (int64_t) ms.ullTotalPhys >> 20);
1780 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1781
1782 st->print("TotalPageFile size " INT64_FORMAT "M ",
1783 (int64_t) ms.ullTotalPageFile >> 20);
1784 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1785 (int64_t) ms.ullAvailPageFile >> 20);
1786
1787 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1788 #if defined(_M_IX86)
1789 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1790 (int64_t) ms.ullTotalVirtual >> 20);
1791 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1792 #endif
1793 } else {
1794 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1795 }
1796
1797 // extended memory statistics for a process
1798 PROCESS_MEMORY_COUNTERS_EX pmex;
1799 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1800 pmex.cb = sizeof(pmex);
1801 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1802
1803 if (r2 != 0) {
1804 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1805 (int64_t) pmex.WorkingSetSize >> 20);
1806 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1807
1808 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1809 (int64_t) pmex.PrivateUsage >> 20);
1810 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1811 } else {
1812 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1813 }
1814
1815 st->cr();
1816 }
1817
1818 bool os::signal_sent_by_kill(const void* siginfo) {
1819 // TODO: Is this possible?
1820 return false;
1821 }
1822
1823 void os::print_siginfo(outputStream *st, const void* siginfo) {
1824 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1825 st->print("siginfo:");
1826
1827 char tmp[64];
1828 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1829 strcpy(tmp, "EXCEPTION_??");
1830 }
1831 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1832
1833 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1834 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1835 er->NumberParameters >= 2) {
1836 switch (er->ExceptionInformation[0]) {
1837 case 0: st->print(", reading address"); break;
1838 case 1: st->print(", writing address"); break;
1839 case 8: st->print(", data execution prevention violation at address"); break;
1840 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1841 er->ExceptionInformation[0]);
1842 }
1843 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1844 } else {
1845 int num = er->NumberParameters;
1846 if (num > 0) {
1847 st->print(", ExceptionInformation=");
1848 for (int i = 0; i < num; i++) {
1849 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1850 }
1851 }
1852 }
1853 st->cr();
1854 }
1855
1856 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1857 // TODO: Can we kill thread?
1858 return false;
1859 }
1860
1861 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1862 // do nothing
1863 }
1864
1865 static char saved_jvm_path[MAX_PATH] = {0};
1866
1867 // Find the full path to the current module, jvm.dll
1868 void os::jvm_path(char *buf, jint buflen) {
1869 // Error checking.
1870 if (buflen < MAX_PATH) {
1871 assert(false, "must use a large-enough buffer");
1872 buf[0] = '\0';
1873 return;
1874 }
1875 // Lazy resolve the path to current module.
1876 if (saved_jvm_path[0] != 0) {
1877 strcpy(buf, saved_jvm_path);
1878 return;
1879 }
1880
1881 buf[0] = '\0';
1882 if (Arguments::sun_java_launcher_is_altjvm()) {
1883 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1884 // for a JAVA_HOME environment variable and fix up the path so it
1885 // looks like jvm.dll is installed there (append a fake suffix
1886 // hotspot/jvm.dll).
1887 char* java_home_var = ::getenv("JAVA_HOME");
1888 if (java_home_var != NULL && java_home_var[0] != 0 &&
1889 strlen(java_home_var) < (size_t)buflen) {
1890 strncpy(buf, java_home_var, buflen);
1891
1892 // determine if this is a legacy image or modules image
1893 // modules image doesn't have "jre" subdirectory
1894 size_t len = strlen(buf);
1895 char* jrebin_p = buf + len;
1896 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1897 if (0 != _access(buf, 0)) {
1898 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1899 }
1900 len = strlen(buf);
1901 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1902 }
1903 }
1904
1905 if (buf[0] == '\0') {
1906 GetModuleFileName(vm_lib_handle, buf, buflen);
1907 }
1908 strncpy(saved_jvm_path, buf, MAX_PATH);
1909 saved_jvm_path[MAX_PATH - 1] = '\0';
1910 }
1911
1912
1913 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1914 #ifndef _WIN64
1915 st->print("_");
1916 #endif
1917 }
1918
1919
1920 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1921 #ifndef _WIN64
1922 st->print("@%d", args_size * sizeof(int));
1923 #endif
1924 }
1925
1926 // This method is a copy of JDK's sysGetLastErrorString
1927 // from src/windows/hpi/src/system_md.c
1928
1929 size_t os::lasterror(char* buf, size_t len) {
1930 DWORD errval;
1931
1932 if ((errval = GetLastError()) != 0) {
1933 // DOS error
1934 size_t n = (size_t)FormatMessage(
1935 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1936 NULL,
1937 errval,
1938 0,
1939 buf,
1940 (DWORD)len,
1941 NULL);
1942 if (n > 3) {
1943 // Drop final '.', CR, LF
1944 if (buf[n - 1] == '\n') n--;
1945 if (buf[n - 1] == '\r') n--;
1946 if (buf[n - 1] == '.') n--;
1947 buf[n] = '\0';
1948 }
1949 return n;
1950 }
1951
1952 if (errno != 0) {
1953 // C runtime error that has no corresponding DOS error code
1954 const char* s = os::strerror(errno);
1955 size_t n = strlen(s);
1956 if (n >= len) n = len - 1;
1957 strncpy(buf, s, n);
1958 buf[n] = '\0';
1959 return n;
1960 }
1961
1962 return 0;
1963 }
1964
1965 int os::get_last_error() {
1966 DWORD error = GetLastError();
1967 if (error == 0) {
1968 error = errno;
1969 }
1970 return (int)error;
1971 }
1972
1973 // sun.misc.Signal
1974 // NOTE that this is a workaround for an apparent kernel bug where if
1975 // a signal handler for SIGBREAK is installed then that signal handler
1976 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1977 // See bug 4416763.
1978 static void (*sigbreakHandler)(int) = NULL;
1979
1980 static void UserHandler(int sig, void *siginfo, void *context) {
1981 os::signal_notify(sig);
1982 // We need to reinstate the signal handler each time...
1983 os::signal(sig, (void*)UserHandler);
1984 }
1985
1986 void* os::user_handler() {
1987 return (void*) UserHandler;
1988 }
1989
1990 void* os::signal(int signal_number, void* handler) {
1991 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1992 void (*oldHandler)(int) = sigbreakHandler;
1993 sigbreakHandler = (void (*)(int)) handler;
1994 return (void*) oldHandler;
1995 } else {
1996 return (void*)::signal(signal_number, (void (*)(int))handler);
1997 }
1998 }
1999
2000 void os::signal_raise(int signal_number) {
2001 raise(signal_number);
2002 }
2003
2004 // The Win32 C runtime library maps all console control events other than ^C
2005 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2006 // logoff, and shutdown events. We therefore install our own console handler
2007 // that raises SIGTERM for the latter cases.
2008 //
2009 static BOOL WINAPI consoleHandler(DWORD event) {
2010 switch (event) {
2011 case CTRL_C_EVENT:
2012 if (VMError::is_error_reported()) {
2013 // Ctrl-C is pressed during error reporting, likely because the error
2014 // handler fails to abort. Let VM die immediately.
2015 os::die();
2016 }
2017
2018 os::signal_raise(SIGINT);
2019 return TRUE;
2020 break;
2021 case CTRL_BREAK_EVENT:
2022 if (sigbreakHandler != NULL) {
2023 (*sigbreakHandler)(SIGBREAK);
2024 }
2025 return TRUE;
2026 break;
2027 case CTRL_LOGOFF_EVENT: {
2028 // Don't terminate JVM if it is running in a non-interactive session,
2029 // such as a service process.
2030 USEROBJECTFLAGS flags;
2031 HANDLE handle = GetProcessWindowStation();
2032 if (handle != NULL &&
2033 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2034 sizeof(USEROBJECTFLAGS), NULL)) {
2035 // If it is a non-interactive session, let next handler to deal
2036 // with it.
2037 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2038 return FALSE;
2039 }
2040 }
2041 }
2042 case CTRL_CLOSE_EVENT:
2043 case CTRL_SHUTDOWN_EVENT:
2044 os::signal_raise(SIGTERM);
2045 return TRUE;
2046 break;
2047 default:
2048 break;
2049 }
2050 return FALSE;
2051 }
2052
2053 // The following code is moved from os.cpp for making this
2054 // code platform specific, which it is by its very nature.
2055
2056 // Return maximum OS signal used + 1 for internal use only
2057 // Used as exit signal for signal_thread
2058 int os::sigexitnum_pd() {
2059 return NSIG;
2060 }
2061
2062 // a counter for each possible signal value, including signal_thread exit signal
2063 static volatile jint pending_signals[NSIG+1] = { 0 };
2064 static Semaphore* sig_sem = NULL;
2065
2066 static void jdk_misc_signal_init() {
2067 // Initialize signal structures
2068 memset((void*)pending_signals, 0, sizeof(pending_signals));
2069
2070 // Initialize signal semaphore
2071 sig_sem = new Semaphore();
2072
2073 // Programs embedding the VM do not want it to attempt to receive
2074 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2075 // shutdown hooks mechanism introduced in 1.3. For example, when
2076 // the VM is run as part of a Windows NT service (i.e., a servlet
2077 // engine in a web server), the correct behavior is for any console
2078 // control handler to return FALSE, not TRUE, because the OS's
2079 // "final" handler for such events allows the process to continue if
2080 // it is a service (while terminating it if it is not a service).
2081 // To make this behavior uniform and the mechanism simpler, we
2082 // completely disable the VM's usage of these console events if -Xrs
2083 // (=ReduceSignalUsage) is specified. This means, for example, that
2084 // the CTRL-BREAK thread dump mechanism is also disabled in this
2085 // case. See bugs 4323062, 4345157, and related bugs.
2086
2087 // Add a CTRL-C handler
2088 SetConsoleCtrlHandler(consoleHandler, TRUE);
2089 }
2090
2091 void os::signal_notify(int sig) {
2092 if (sig_sem != NULL) {
2093 Atomic::inc(&pending_signals[sig]);
2094 sig_sem->signal();
2095 } else {
2096 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2097 // initialization isn't called.
2098 assert(ReduceSignalUsage, "signal semaphore should be created");
2099 }
2100 }
2101
2102 static int check_pending_signals() {
2103 while (true) {
2104 for (int i = 0; i < NSIG + 1; i++) {
2105 jint n = pending_signals[i];
2106 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
2107 return i;
2108 }
2109 }
2110 JavaThread *thread = JavaThread::current();
2111
2112 ThreadBlockInVM tbivm(thread);
2113
2114 bool threadIsSuspended;
2115 do {
2116 thread->set_suspend_equivalent();
2117 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2118 sig_sem->wait();
2119
2120 // were we externally suspended while we were waiting?
2121 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2122 if (threadIsSuspended) {
2123 // The semaphore has been incremented, but while we were waiting
2124 // another thread suspended us. We don't want to continue running
2125 // while suspended because that would surprise the thread that
2126 // suspended us.
2127 sig_sem->signal();
2128
2129 thread->java_suspend_self();
2130 }
2131 } while (threadIsSuspended);
2132 }
2133 }
2134
2135 int os::signal_wait() {
2136 return check_pending_signals();
2137 }
2138
2139 // Implicit OS exception handling
2140
2141 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2142 address handler) {
2143 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2144 // Save pc in thread
2145 #ifdef _M_AMD64
2146 // Do not blow up if no thread info available.
2147 if (thread) {
2148 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2149 }
2150 // Set pc to handler
2151 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2152 #else
2153 // Do not blow up if no thread info available.
2154 if (thread) {
2155 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2156 }
2157 // Set pc to handler
2158 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2159 #endif
2160
2161 // Continue the execution
2162 return EXCEPTION_CONTINUE_EXECUTION;
2163 }
2164
2165
2166 // Used for PostMortemDump
2167 extern "C" void safepoints();
2168 extern "C" void find(int x);
2169 extern "C" void events();
2170
2171 // According to Windows API documentation, an illegal instruction sequence should generate
2172 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2173 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2174 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2175
2176 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2177
2178 // From "Execution Protection in the Windows Operating System" draft 0.35
2179 // Once a system header becomes available, the "real" define should be
2180 // included or copied here.
2181 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2182
2183 // Windows Vista/2008 heap corruption check
2184 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2185
2186 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2187 // C++ compiler contain this error code. Because this is a compiler-generated
2188 // error, the code is not listed in the Win32 API header files.
2189 // The code is actually a cryptic mnemonic device, with the initial "E"
2190 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2191 // ASCII values of "msc".
2192
2193 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2194
2195 #define def_excpt(val) { #val, (val) }
2196
2197 static const struct { const char* name; uint number; } exceptlabels[] = {
2198 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2199 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2200 def_excpt(EXCEPTION_BREAKPOINT),
2201 def_excpt(EXCEPTION_SINGLE_STEP),
2202 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2203 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2204 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2205 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2206 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2207 def_excpt(EXCEPTION_FLT_OVERFLOW),
2208 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2209 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2210 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2211 def_excpt(EXCEPTION_INT_OVERFLOW),
2212 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2213 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2214 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2215 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2216 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2217 def_excpt(EXCEPTION_STACK_OVERFLOW),
2218 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2219 def_excpt(EXCEPTION_GUARD_PAGE),
2220 def_excpt(EXCEPTION_INVALID_HANDLE),
2221 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2222 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2223 };
2224
2225 #undef def_excpt
2226
2227 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2228 uint code = static_cast<uint>(exception_code);
2229 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2230 if (exceptlabels[i].number == code) {
2231 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2232 return buf;
2233 }
2234 }
2235
2236 return NULL;
2237 }
2238
2239 //-----------------------------------------------------------------------------
2240 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2241 // handle exception caused by idiv; should only happen for -MinInt/-1
2242 // (division by zero is handled explicitly)
2243 #ifdef _M_AMD64
2244 PCONTEXT ctx = exceptionInfo->ContextRecord;
2245 address pc = (address)ctx->Rip;
2246 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2247 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2248 if (pc[0] == 0xF7) {
2249 // set correct result values and continue after idiv instruction
2250 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2251 } else {
2252 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2253 }
2254 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2255 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2256 // idiv opcode (0xF7).
2257 ctx->Rdx = (DWORD)0; // remainder
2258 // Continue the execution
2259 #else
2260 PCONTEXT ctx = exceptionInfo->ContextRecord;
2261 address pc = (address)ctx->Eip;
2262 assert(pc[0] == 0xF7, "not an idiv opcode");
2263 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2264 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2265 // set correct result values and continue after idiv instruction
2266 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2267 ctx->Eax = (DWORD)min_jint; // result
2268 ctx->Edx = (DWORD)0; // remainder
2269 // Continue the execution
2270 #endif
2271 return EXCEPTION_CONTINUE_EXECUTION;
2272 }
2273
2274 //-----------------------------------------------------------------------------
2275 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2276 PCONTEXT ctx = exceptionInfo->ContextRecord;
2277 #ifndef _WIN64
2278 // handle exception caused by native method modifying control word
2279 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2280
2281 switch (exception_code) {
2282 case EXCEPTION_FLT_DENORMAL_OPERAND:
2283 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2284 case EXCEPTION_FLT_INEXACT_RESULT:
2285 case EXCEPTION_FLT_INVALID_OPERATION:
2286 case EXCEPTION_FLT_OVERFLOW:
2287 case EXCEPTION_FLT_STACK_CHECK:
2288 case EXCEPTION_FLT_UNDERFLOW:
2289 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2290 if (fp_control_word != ctx->FloatSave.ControlWord) {
2291 // Restore FPCW and mask out FLT exceptions
2292 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2293 // Mask out pending FLT exceptions
2294 ctx->FloatSave.StatusWord &= 0xffffff00;
2295 return EXCEPTION_CONTINUE_EXECUTION;
2296 }
2297 }
2298
2299 if (prev_uef_handler != NULL) {
2300 // We didn't handle this exception so pass it to the previous
2301 // UnhandledExceptionFilter.
2302 return (prev_uef_handler)(exceptionInfo);
2303 }
2304 #else // !_WIN64
2305 // On Windows, the mxcsr control bits are non-volatile across calls
2306 // See also CR 6192333
2307 //
2308 jint MxCsr = INITIAL_MXCSR;
2309 // we can't use StubRoutines::addr_mxcsr_std()
2310 // because in Win64 mxcsr is not saved there
2311 if (MxCsr != ctx->MxCsr) {
2312 ctx->MxCsr = MxCsr;
2313 return EXCEPTION_CONTINUE_EXECUTION;
2314 }
2315 #endif // !_WIN64
2316
2317 return EXCEPTION_CONTINUE_SEARCH;
2318 }
2319
2320 static inline void report_error(Thread* t, DWORD exception_code,
2321 address addr, void* siginfo, void* context) {
2322 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2323
2324 // If UseOsErrorReporting, this will return here and save the error file
2325 // somewhere where we can find it in the minidump.
2326 }
2327
2328 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2329 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2330 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2331 address addr = (address) exceptionRecord->ExceptionInformation[1];
2332 if (Interpreter::contains(pc)) {
2333 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2334 if (!fr->is_first_java_frame()) {
2335 // get_frame_at_stack_banging_point() is only called when we
2336 // have well defined stacks so java_sender() calls do not need
2337 // to assert safe_for_sender() first.
2338 *fr = fr->java_sender();
2339 }
2340 } else {
2341 // more complex code with compiled code
2342 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2343 CodeBlob* cb = CodeCache::find_blob(pc);
2344 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2345 // Not sure where the pc points to, fallback to default
2346 // stack overflow handling
2347 return false;
2348 } else {
2349 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2350 // in compiled code, the stack banging is performed just after the return pc
2351 // has been pushed on the stack
2352 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2353 if (!fr->is_java_frame()) {
2354 // See java_sender() comment above.
2355 *fr = fr->java_sender();
2356 }
2357 }
2358 }
2359 assert(fr->is_java_frame(), "Safety check");
2360 return true;
2361 }
2362
2363 #if INCLUDE_AOT
2364 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2365 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2366 address addr = (address) exceptionRecord->ExceptionInformation[1];
2367 address pc = (address) exceptionInfo->ContextRecord->Rip;
2368
2369 // Handle the case where we get an implicit exception in AOT generated
2370 // code. AOT DLL's loaded are not registered for structured exceptions.
2371 // If the exception occurred in the codeCache or AOT code, pass control
2372 // to our normal exception handler.
2373 CodeBlob* cb = CodeCache::find_blob(pc);
2374 if (cb != NULL) {
2375 return topLevelExceptionFilter(exceptionInfo);
2376 }
2377
2378 return EXCEPTION_CONTINUE_SEARCH;
2379 }
2380 #endif
2381
2382 //-----------------------------------------------------------------------------
2383 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2384 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2385 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2386 #ifdef _M_AMD64
2387 address pc = (address) exceptionInfo->ContextRecord->Rip;
2388 #else
2389 address pc = (address) exceptionInfo->ContextRecord->Eip;
2390 #endif
2391 Thread* t = Thread::current_or_null_safe();
2392
2393 // Handle SafeFetch32 and SafeFetchN exceptions.
2394 if (StubRoutines::is_safefetch_fault(pc)) {
2395 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2396 }
2397
2398 #ifndef _WIN64
2399 // Execution protection violation - win32 running on AMD64 only
2400 // Handled first to avoid misdiagnosis as a "normal" access violation;
2401 // This is safe to do because we have a new/unique ExceptionInformation
2402 // code for this condition.
2403 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2404 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2405 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2406 address addr = (address) exceptionRecord->ExceptionInformation[1];
2407
2408 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2409 int page_size = os::vm_page_size();
2410
2411 // Make sure the pc and the faulting address are sane.
2412 //
2413 // If an instruction spans a page boundary, and the page containing
2414 // the beginning of the instruction is executable but the following
2415 // page is not, the pc and the faulting address might be slightly
2416 // different - we still want to unguard the 2nd page in this case.
2417 //
2418 // 15 bytes seems to be a (very) safe value for max instruction size.
2419 bool pc_is_near_addr =
2420 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2421 bool instr_spans_page_boundary =
2422 (align_down((intptr_t) pc ^ (intptr_t) addr,
2423 (intptr_t) page_size) > 0);
2424
2425 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2426 static volatile address last_addr =
2427 (address) os::non_memory_address_word();
2428
2429 // In conservative mode, don't unguard unless the address is in the VM
2430 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2431 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2432
2433 // Set memory to RWX and retry
2434 address page_start = align_down(addr, page_size);
2435 bool res = os::protect_memory((char*) page_start, page_size,
2436 os::MEM_PROT_RWX);
2437
2438 log_debug(os)("Execution protection violation "
2439 "at " INTPTR_FORMAT
2440 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2441 p2i(page_start), (res ? "success" : os::strerror(errno)));
2442
2443 // Set last_addr so if we fault again at the same address, we don't
2444 // end up in an endless loop.
2445 //
2446 // There are two potential complications here. Two threads trapping
2447 // at the same address at the same time could cause one of the
2448 // threads to think it already unguarded, and abort the VM. Likely
2449 // very rare.
2450 //
2451 // The other race involves two threads alternately trapping at
2452 // different addresses and failing to unguard the page, resulting in
2453 // an endless loop. This condition is probably even more unlikely
2454 // than the first.
2455 //
2456 // Although both cases could be avoided by using locks or thread
2457 // local last_addr, these solutions are unnecessary complication:
2458 // this handler is a best-effort safety net, not a complete solution.
2459 // It is disabled by default and should only be used as a workaround
2460 // in case we missed any no-execute-unsafe VM code.
2461
2462 last_addr = addr;
2463
2464 return EXCEPTION_CONTINUE_EXECUTION;
2465 }
2466 }
2467
2468 // Last unguard failed or not unguarding
2469 tty->print_raw_cr("Execution protection violation");
2470 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2471 exceptionInfo->ContextRecord);
2472 return EXCEPTION_CONTINUE_SEARCH;
2473 }
2474 }
2475 #endif // _WIN64
2476
2477 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2478 VM_Version::is_cpuinfo_segv_addr(pc)) {
2479 // Verify that OS save/restore AVX registers.
2480 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2481 }
2482
2483 if (t != NULL && t->is_Java_thread()) {
2484 JavaThread* thread = (JavaThread*) t;
2485 bool in_java = thread->thread_state() == _thread_in_Java;
2486
2487 // Handle potential stack overflows up front.
2488 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2489 if (thread->stack_guards_enabled()) {
2490 if (in_java) {
2491 frame fr;
2492 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2493 address addr = (address) exceptionRecord->ExceptionInformation[1];
2494 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2495 assert(fr.is_java_frame(), "Must be a Java frame");
2496 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2497 }
2498 }
2499 // Yellow zone violation. The o/s has unprotected the first yellow
2500 // zone page for us. Note: must call disable_stack_yellow_zone to
2501 // update the enabled status, even if the zone contains only one page.
2502 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2503 thread->disable_stack_yellow_reserved_zone();
2504 // If not in java code, return and hope for the best.
2505 return in_java
2506 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2507 : EXCEPTION_CONTINUE_EXECUTION;
2508 } else {
2509 // Fatal red zone violation.
2510 thread->disable_stack_red_zone();
2511 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2512 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2513 exceptionInfo->ContextRecord);
2514 return EXCEPTION_CONTINUE_SEARCH;
2515 }
2516 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2517 // Either stack overflow or null pointer exception.
2518 if (in_java) {
2519 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2520 address addr = (address) exceptionRecord->ExceptionInformation[1];
2521 address stack_end = thread->stack_end();
2522 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2523 // Stack overflow.
2524 assert(!os::uses_stack_guard_pages(),
2525 "should be caught by red zone code above.");
2526 return Handle_Exception(exceptionInfo,
2527 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2528 }
2529 // Check for safepoint polling and implicit null
2530 // We only expect null pointers in the stubs (vtable)
2531 // the rest are checked explicitly now.
2532 CodeBlob* cb = CodeCache::find_blob(pc);
2533 if (cb != NULL) {
2534 if (os::is_poll_address(addr)) {
2535 address stub = SharedRuntime::get_poll_stub(pc);
2536 return Handle_Exception(exceptionInfo, stub);
2537 }
2538 }
2539 {
2540 #ifdef _WIN64
2541 // If it's a legal stack address map the entire region in
2542 //
2543 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2544 address addr = (address) exceptionRecord->ExceptionInformation[1];
2545 if (thread->is_in_usable_stack(addr)) {
2546 addr = (address)((uintptr_t)addr &
2547 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2548 os::commit_memory((char *)addr, thread->stack_base() - addr,
2549 !ExecMem);
2550 return EXCEPTION_CONTINUE_EXECUTION;
2551 } else
2552 #endif
2553 {
2554 // Null pointer exception.
2555 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2556 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2557 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2558 }
2559 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2560 exceptionInfo->ContextRecord);
2561 return EXCEPTION_CONTINUE_SEARCH;
2562 }
2563 }
2564 }
2565
2566 #ifdef _WIN64
2567 // Special care for fast JNI field accessors.
2568 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2569 // in and the heap gets shrunk before the field access.
2570 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2571 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2572 if (addr != (address)-1) {
2573 return Handle_Exception(exceptionInfo, addr);
2574 }
2575 }
2576 #endif
2577
2578 // Stack overflow or null pointer exception in native code.
2579 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2580 exceptionInfo->ContextRecord);
2581 return EXCEPTION_CONTINUE_SEARCH;
2582 } // /EXCEPTION_ACCESS_VIOLATION
2583 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2584
2585 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2586 CompiledMethod* nm = NULL;
2587 JavaThread* thread = (JavaThread*)t;
2588 if (in_java) {
2589 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2590 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2591 }
2592
2593 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2594 if (((thread->thread_state() == _thread_in_vm ||
2595 thread->thread_state() == _thread_in_native ||
2596 is_unsafe_arraycopy) &&
2597 thread->doing_unsafe_access()) ||
2598 (nm != NULL && nm->has_unsafe_access())) {
2599 address next_pc = Assembler::locate_next_instruction(pc);
2600 if (is_unsafe_arraycopy) {
2601 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2602 }
2603 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2604 }
2605 }
2606
2607 if (in_java) {
2608 switch (exception_code) {
2609 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2610 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2611
2612 case EXCEPTION_INT_OVERFLOW:
2613 return Handle_IDiv_Exception(exceptionInfo);
2614
2615 } // switch
2616 }
2617 if (((thread->thread_state() == _thread_in_Java) ||
2618 (thread->thread_state() == _thread_in_native)) &&
2619 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2620 LONG result=Handle_FLT_Exception(exceptionInfo);
2621 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2622 }
2623 }
2624
2625 if (exception_code != EXCEPTION_BREAKPOINT) {
2626 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2627 exceptionInfo->ContextRecord);
2628 }
2629 return EXCEPTION_CONTINUE_SEARCH;
2630 }
2631
2632 #ifndef _WIN64
2633 // Special care for fast JNI accessors.
2634 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2635 // the heap gets shrunk before the field access.
2636 // Need to install our own structured exception handler since native code may
2637 // install its own.
2638 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2639 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2640 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2641 address pc = (address) exceptionInfo->ContextRecord->Eip;
2642 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2643 if (addr != (address)-1) {
2644 return Handle_Exception(exceptionInfo, addr);
2645 }
2646 }
2647 return EXCEPTION_CONTINUE_SEARCH;
2648 }
2649
2650 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2651 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2652 jobject obj, \
2653 jfieldID fieldID) { \
2654 __try { \
2655 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2656 obj, \
2657 fieldID); \
2658 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2659 _exception_info())) { \
2660 } \
2661 return 0; \
2662 }
2663
2664 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2665 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2666 DEFINE_FAST_GETFIELD(jchar, char, Char)
2667 DEFINE_FAST_GETFIELD(jshort, short, Short)
2668 DEFINE_FAST_GETFIELD(jint, int, Int)
2669 DEFINE_FAST_GETFIELD(jlong, long, Long)
2670 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2671 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2672
2673 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2674 switch (type) {
2675 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2676 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2677 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2678 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2679 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2680 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2681 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2682 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2683 default: ShouldNotReachHere();
2684 }
2685 return (address)-1;
2686 }
2687 #endif
2688
2689 // Virtual Memory
2690
2691 int os::vm_page_size() { return os::win32::vm_page_size(); }
2692 int os::vm_allocation_granularity() {
2693 return os::win32::vm_allocation_granularity();
2694 }
2695
2696 // Windows large page support is available on Windows 2003. In order to use
2697 // large page memory, the administrator must first assign additional privilege
2698 // to the user:
2699 // + select Control Panel -> Administrative Tools -> Local Security Policy
2700 // + select Local Policies -> User Rights Assignment
2701 // + double click "Lock pages in memory", add users and/or groups
2702 // + reboot
2703 // Note the above steps are needed for administrator as well, as administrators
2704 // by default do not have the privilege to lock pages in memory.
2705 //
2706 // Note about Windows 2003: although the API supports committing large page
2707 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2708 // scenario, I found through experiment it only uses large page if the entire
2709 // memory region is reserved and committed in a single VirtualAlloc() call.
2710 // This makes Windows large page support more or less like Solaris ISM, in
2711 // that the entire heap must be committed upfront. This probably will change
2712 // in the future, if so the code below needs to be revisited.
2713
2714 #ifndef MEM_LARGE_PAGES
2715 #define MEM_LARGE_PAGES 0x20000000
2716 #endif
2717
2718 static HANDLE _hProcess;
2719 static HANDLE _hToken;
2720
2721 // Container for NUMA node list info
2722 class NUMANodeListHolder {
2723 private:
2724 int *_numa_used_node_list; // allocated below
2725 int _numa_used_node_count;
2726
2727 void free_node_list() {
2728 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2729 }
2730
2731 public:
2732 NUMANodeListHolder() {
2733 _numa_used_node_count = 0;
2734 _numa_used_node_list = NULL;
2735 // do rest of initialization in build routine (after function pointers are set up)
2736 }
2737
2738 ~NUMANodeListHolder() {
2739 free_node_list();
2740 }
2741
2742 bool build() {
2743 DWORD_PTR proc_aff_mask;
2744 DWORD_PTR sys_aff_mask;
2745 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2746 ULONG highest_node_number;
2747 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2748 free_node_list();
2749 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2750 for (unsigned int i = 0; i <= highest_node_number; i++) {
2751 ULONGLONG proc_mask_numa_node;
2752 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2753 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2754 _numa_used_node_list[_numa_used_node_count++] = i;
2755 }
2756 }
2757 return (_numa_used_node_count > 1);
2758 }
2759
2760 int get_count() { return _numa_used_node_count; }
2761 int get_node_list_entry(int n) {
2762 // for indexes out of range, returns -1
2763 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2764 }
2765
2766 } numa_node_list_holder;
2767
2768
2769
2770 static size_t _large_page_size = 0;
2771
2772 static bool request_lock_memory_privilege() {
2773 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2774 os::current_process_id());
2775
2776 LUID luid;
2777 if (_hProcess != NULL &&
2778 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2779 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2780
2781 TOKEN_PRIVILEGES tp;
2782 tp.PrivilegeCount = 1;
2783 tp.Privileges[0].Luid = luid;
2784 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2785
2786 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2787 // privilege. Check GetLastError() too. See MSDN document.
2788 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2789 (GetLastError() == ERROR_SUCCESS)) {
2790 return true;
2791 }
2792 }
2793
2794 return false;
2795 }
2796
2797 static void cleanup_after_large_page_init() {
2798 if (_hProcess) CloseHandle(_hProcess);
2799 _hProcess = NULL;
2800 if (_hToken) CloseHandle(_hToken);
2801 _hToken = NULL;
2802 }
2803
2804 static bool numa_interleaving_init() {
2805 bool success = false;
2806 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2807
2808 // print a warning if UseNUMAInterleaving flag is specified on command line
2809 bool warn_on_failure = use_numa_interleaving_specified;
2810 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2811
2812 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2813 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2814 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2815
2816 if (numa_node_list_holder.build()) {
2817 if (log_is_enabled(Debug, os, cpu)) {
2818 Log(os, cpu) log;
2819 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2820 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2821 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2822 }
2823 }
2824 success = true;
2825 } else {
2826 WARN("Process does not cover multiple NUMA nodes.");
2827 }
2828 if (!success) {
2829 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2830 }
2831 return success;
2832 #undef WARN
2833 }
2834
2835 // this routine is used whenever we need to reserve a contiguous VA range
2836 // but we need to make separate VirtualAlloc calls for each piece of the range
2837 // Reasons for doing this:
2838 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2839 // * UseNUMAInterleaving requires a separate node for each piece
2840 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2841 DWORD prot,
2842 bool should_inject_error = false) {
2843 char * p_buf;
2844 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2845 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2846 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2847
2848 // first reserve enough address space in advance since we want to be
2849 // able to break a single contiguous virtual address range into multiple
2850 // large page commits but WS2003 does not allow reserving large page space
2851 // so we just use 4K pages for reserve, this gives us a legal contiguous
2852 // address space. then we will deallocate that reservation, and re alloc
2853 // using large pages
2854 const size_t size_of_reserve = bytes + chunk_size;
2855 if (bytes > size_of_reserve) {
2856 // Overflowed.
2857 return NULL;
2858 }
2859 p_buf = (char *) VirtualAlloc(addr,
2860 size_of_reserve, // size of Reserve
2861 MEM_RESERVE,
2862 PAGE_READWRITE);
2863 // If reservation failed, return NULL
2864 if (p_buf == NULL) return NULL;
2865 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2866 os::release_memory(p_buf, bytes + chunk_size);
2867
2868 // we still need to round up to a page boundary (in case we are using large pages)
2869 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2870 // instead we handle this in the bytes_to_rq computation below
2871 p_buf = align_up(p_buf, page_size);
2872
2873 // now go through and allocate one chunk at a time until all bytes are
2874 // allocated
2875 size_t bytes_remaining = bytes;
2876 // An overflow of align_up() would have been caught above
2877 // in the calculation of size_of_reserve.
2878 char * next_alloc_addr = p_buf;
2879 HANDLE hProc = GetCurrentProcess();
2880
2881 #ifdef ASSERT
2882 // Variable for the failure injection
2883 int ran_num = os::random();
2884 size_t fail_after = ran_num % bytes;
2885 #endif
2886
2887 int count=0;
2888 while (bytes_remaining) {
2889 // select bytes_to_rq to get to the next chunk_size boundary
2890
2891 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2892 // Note allocate and commit
2893 char * p_new;
2894
2895 #ifdef ASSERT
2896 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2897 #else
2898 const bool inject_error_now = false;
2899 #endif
2900
2901 if (inject_error_now) {
2902 p_new = NULL;
2903 } else {
2904 if (!UseNUMAInterleaving) {
2905 p_new = (char *) VirtualAlloc(next_alloc_addr,
2906 bytes_to_rq,
2907 flags,
2908 prot);
2909 } else {
2910 // get the next node to use from the used_node_list
2911 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2912 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2913 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2914 }
2915 }
2916
2917 if (p_new == NULL) {
2918 // Free any allocated pages
2919 if (next_alloc_addr > p_buf) {
2920 // Some memory was committed so release it.
2921 size_t bytes_to_release = bytes - bytes_remaining;
2922 // NMT has yet to record any individual blocks, so it
2923 // need to create a dummy 'reserve' record to match
2924 // the release.
2925 MemTracker::record_virtual_memory_reserve((address)p_buf,
2926 bytes_to_release, CALLER_PC);
2927 os::release_memory(p_buf, bytes_to_release);
2928 }
2929 #ifdef ASSERT
2930 if (should_inject_error) {
2931 log_develop_debug(pagesize)("Reserving pages individually failed.");
2932 }
2933 #endif
2934 return NULL;
2935 }
2936
2937 bytes_remaining -= bytes_to_rq;
2938 next_alloc_addr += bytes_to_rq;
2939 count++;
2940 }
2941 // Although the memory is allocated individually, it is returned as one.
2942 // NMT records it as one block.
2943 if ((flags & MEM_COMMIT) != 0) {
2944 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2945 } else {
2946 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2947 }
2948
2949 // made it this far, success
2950 return p_buf;
2951 }
2952
2953
2954
2955 void os::large_page_init() {
2956 if (!UseLargePages) return;
2957
2958 // print a warning if any large page related flag is specified on command line
2959 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2960 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2961 bool success = false;
2962
2963 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2964 if (request_lock_memory_privilege()) {
2965 size_t s = GetLargePageMinimum();
2966 if (s) {
2967 #if defined(IA32) || defined(AMD64)
2968 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2969 WARN("JVM cannot use large pages bigger than 4mb.");
2970 } else {
2971 #endif
2972 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2973 _large_page_size = LargePageSizeInBytes;
2974 } else {
2975 _large_page_size = s;
2976 }
2977 success = true;
2978 #if defined(IA32) || defined(AMD64)
2979 }
2980 #endif
2981 } else {
2982 WARN("Large page is not supported by the processor.");
2983 }
2984 } else {
2985 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2986 }
2987 #undef WARN
2988
2989 const size_t default_page_size = (size_t) vm_page_size();
2990 if (success && _large_page_size > default_page_size) {
2991 _page_sizes[0] = _large_page_size;
2992 _page_sizes[1] = default_page_size;
2993 _page_sizes[2] = 0;
2994 }
2995
2996 cleanup_after_large_page_init();
2997 UseLargePages = success;
2998 }
2999
3000 int os::create_file_for_heap(const char* dir) {
3001
3002 const char name_template[] = "/jvmheap.XXXXXX";
3003
3004 size_t fullname_len = strlen(dir) + strlen(name_template);
3005 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3006 if (fullname == NULL) {
3007 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3008 return -1;
3009 }
3010 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3011 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3012
3013 os::native_path(fullname);
3014
3015 char *path = _mktemp(fullname);
3016 if (path == NULL) {
3017 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3018 os::free(fullname);
3019 return -1;
3020 }
3021
3022 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3023
3024 os::free(fullname);
3025 if (fd < 0) {
3026 warning("Problem opening file for heap (%s)", os::strerror(errno));
3027 return -1;
3028 }
3029 return fd;
3030 }
3031
3032 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3033 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3034 assert(fd != -1, "File descriptor is not valid");
3035
3036 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3037 #ifdef _LP64
3038 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3039 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3040 #else
3041 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3042 0, (DWORD)size, NULL);
3043 #endif
3044 if (fileMapping == NULL) {
3045 if (GetLastError() == ERROR_DISK_FULL) {
3046 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3047 }
3048 else {
3049 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3050 }
3051
3052 return NULL;
3053 }
3054
3055 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3056
3057 CloseHandle(fileMapping);
3058
3059 return (char*)addr;
3060 }
3061
3062 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3063 assert(fd != -1, "File descriptor is not valid");
3064 assert(base != NULL, "Base address cannot be NULL");
3065
3066 release_memory(base, size);
3067 return map_memory_to_file(base, size, fd);
3068 }
3069
3070 // On win32, one cannot release just a part of reserved memory, it's an
3071 // all or nothing deal. When we split a reservation, we must break the
3072 // reservation into two reservations.
3073 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3074 bool realloc) {
3075 if (size > 0) {
3076 release_memory(base, size);
3077 if (realloc) {
3078 reserve_memory(split, base);
3079 }
3080 if (size != split) {
3081 reserve_memory(size - split, base + split);
3082 }
3083 }
3084 }
3085
3086 // Multiple threads can race in this code but it's not possible to unmap small sections of
3087 // virtual space to get requested alignment, like posix-like os's.
3088 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3089 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3090 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3091 "Alignment must be a multiple of allocation granularity (page size)");
3092 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3093
3094 size_t extra_size = size + alignment;
3095 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3096
3097 char* aligned_base = NULL;
3098
3099 do {
3100 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3101 if (extra_base == NULL) {
3102 return NULL;
3103 }
3104 // Do manual alignment
3105 aligned_base = align_up(extra_base, alignment);
3106
3107 if (file_desc != -1) {
3108 os::unmap_memory(extra_base, extra_size);
3109 } else {
3110 os::release_memory(extra_base, extra_size);
3111 }
3112
3113 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3114
3115 } while (aligned_base == NULL);
3116
3117 return aligned_base;
3118 }
3119
3120 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3121 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3122 "reserve alignment");
3123 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3124 char* res;
3125 // note that if UseLargePages is on, all the areas that require interleaving
3126 // will go thru reserve_memory_special rather than thru here.
3127 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3128 if (!use_individual) {
3129 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3130 } else {
3131 elapsedTimer reserveTimer;
3132 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3133 // in numa interleaving, we have to allocate pages individually
3134 // (well really chunks of NUMAInterleaveGranularity size)
3135 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3136 if (res == NULL) {
3137 warning("NUMA page allocation failed");
3138 }
3139 if (Verbose && PrintMiscellaneous) {
3140 reserveTimer.stop();
3141 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3142 reserveTimer.milliseconds(), reserveTimer.ticks());
3143 }
3144 }
3145 assert(res == NULL || addr == NULL || addr == res,
3146 "Unexpected address from reserve.");
3147
3148 return res;
3149 }
3150
3151 // Reserve memory at an arbitrary address, only if that area is
3152 // available (and not reserved for something else).
3153 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3154 // Windows os::reserve_memory() fails of the requested address range is
3155 // not avilable.
3156 return reserve_memory(bytes, requested_addr);
3157 }
3158
3159 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3160 assert(file_desc >= 0, "file_desc is not valid");
3161 return map_memory_to_file(requested_addr, bytes, file_desc);
3162 }
3163
3164 size_t os::large_page_size() {
3165 return _large_page_size;
3166 }
3167
3168 bool os::can_commit_large_page_memory() {
3169 // Windows only uses large page memory when the entire region is reserved
3170 // and committed in a single VirtualAlloc() call. This may change in the
3171 // future, but with Windows 2003 it's not possible to commit on demand.
3172 return false;
3173 }
3174
3175 bool os::can_execute_large_page_memory() {
3176 return true;
3177 }
3178
3179 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3180 bool exec) {
3181 assert(UseLargePages, "only for large pages");
3182
3183 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3184 return NULL; // Fallback to small pages.
3185 }
3186
3187 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3188 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3189
3190 // with large pages, there are two cases where we need to use Individual Allocation
3191 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3192 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3193 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3194 log_debug(pagesize)("Reserving large pages individually.");
3195
3196 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3197 if (p_buf == NULL) {
3198 // give an appropriate warning message
3199 if (UseNUMAInterleaving) {
3200 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3201 }
3202 if (UseLargePagesIndividualAllocation) {
3203 warning("Individually allocated large pages failed, "
3204 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3205 }
3206 return NULL;
3207 }
3208
3209 return p_buf;
3210
3211 } else {
3212 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3213
3214 // normal policy just allocate it all at once
3215 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3216 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3217 if (res != NULL) {
3218 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3219 }
3220
3221 return res;
3222 }
3223 }
3224
3225 bool os::release_memory_special(char* base, size_t bytes) {
3226 assert(base != NULL, "Sanity check");
3227 return release_memory(base, bytes);
3228 }
3229
3230 void os::print_statistics() {
3231 }
3232
3233 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3234 int err = os::get_last_error();
3235 char buf[256];
3236 size_t buf_len = os::lasterror(buf, sizeof(buf));
3237 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3238 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3239 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3240 }
3241
3242 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3243 if (bytes == 0) {
3244 // Don't bother the OS with noops.
3245 return true;
3246 }
3247 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3248 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3249 // Don't attempt to print anything if the OS call fails. We're
3250 // probably low on resources, so the print itself may cause crashes.
3251
3252 // unless we have NUMAInterleaving enabled, the range of a commit
3253 // is always within a reserve covered by a single VirtualAlloc
3254 // in that case we can just do a single commit for the requested size
3255 if (!UseNUMAInterleaving) {
3256 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3257 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3258 return false;
3259 }
3260 if (exec) {
3261 DWORD oldprot;
3262 // Windows doc says to use VirtualProtect to get execute permissions
3263 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3264 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3265 return false;
3266 }
3267 }
3268 return true;
3269 } else {
3270
3271 // when NUMAInterleaving is enabled, the commit might cover a range that
3272 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3273 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3274 // returns represents the number of bytes that can be committed in one step.
3275 size_t bytes_remaining = bytes;
3276 char * next_alloc_addr = addr;
3277 while (bytes_remaining > 0) {
3278 MEMORY_BASIC_INFORMATION alloc_info;
3279 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3280 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3281 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3282 PAGE_READWRITE) == NULL) {
3283 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3284 exec);)
3285 return false;
3286 }
3287 if (exec) {
3288 DWORD oldprot;
3289 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3290 PAGE_EXECUTE_READWRITE, &oldprot)) {
3291 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3292 exec);)
3293 return false;
3294 }
3295 }
3296 bytes_remaining -= bytes_to_rq;
3297 next_alloc_addr += bytes_to_rq;
3298 }
3299 }
3300 // if we made it this far, return true
3301 return true;
3302 }
3303
3304 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3305 bool exec) {
3306 // alignment_hint is ignored on this OS
3307 return pd_commit_memory(addr, size, exec);
3308 }
3309
3310 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3311 const char* mesg) {
3312 assert(mesg != NULL, "mesg must be specified");
3313 if (!pd_commit_memory(addr, size, exec)) {
3314 warn_fail_commit_memory(addr, size, exec);
3315 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3316 }
3317 }
3318
3319 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3320 size_t alignment_hint, bool exec,
3321 const char* mesg) {
3322 // alignment_hint is ignored on this OS
3323 pd_commit_memory_or_exit(addr, size, exec, mesg);
3324 }
3325
3326 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3327 if (bytes == 0) {
3328 // Don't bother the OS with noops.
3329 return true;
3330 }
3331 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3332 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3333 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3334 }
3335
3336 bool os::pd_release_memory(char* addr, size_t bytes) {
3337 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3338 }
3339
3340 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3341 return os::commit_memory(addr, size, !ExecMem);
3342 }
3343
3344 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3345 return os::uncommit_memory(addr, size);
3346 }
3347
3348 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3349 uint count = 0;
3350 bool ret = false;
3351 size_t bytes_remaining = bytes;
3352 char * next_protect_addr = addr;
3353
3354 // Use VirtualQuery() to get the chunk size.
3355 while (bytes_remaining) {
3356 MEMORY_BASIC_INFORMATION alloc_info;
3357 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3358 return false;
3359 }
3360
3361 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3362 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3363 // but we don't distinguish here as both cases are protected by same API.
3364 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3365 warning("Failed protecting pages individually for chunk #%u", count);
3366 if (!ret) {
3367 return false;
3368 }
3369
3370 bytes_remaining -= bytes_to_protect;
3371 next_protect_addr += bytes_to_protect;
3372 count++;
3373 }
3374 return ret;
3375 }
3376
3377 // Set protections specified
3378 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3379 bool is_committed) {
3380 unsigned int p = 0;
3381 switch (prot) {
3382 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3383 case MEM_PROT_READ: p = PAGE_READONLY; break;
3384 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3385 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3386 default:
3387 ShouldNotReachHere();
3388 }
3389
3390 DWORD old_status;
3391
3392 // Strange enough, but on Win32 one can change protection only for committed
3393 // memory, not a big deal anyway, as bytes less or equal than 64K
3394 if (!is_committed) {
3395 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3396 "cannot commit protection page");
3397 }
3398 // One cannot use os::guard_memory() here, as on Win32 guard page
3399 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3400 //
3401 // Pages in the region become guard pages. Any attempt to access a guard page
3402 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3403 // the guard page status. Guard pages thus act as a one-time access alarm.
3404 bool ret;
3405 if (UseNUMAInterleaving) {
3406 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3407 // so we must protect the chunks individually.
3408 ret = protect_pages_individually(addr, bytes, p, &old_status);
3409 } else {
3410 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3411 }
3412 #ifdef ASSERT
3413 if (!ret) {
3414 int err = os::get_last_error();
3415 char buf[256];
3416 size_t buf_len = os::lasterror(buf, sizeof(buf));
3417 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3418 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3419 buf_len != 0 ? buf : "<no_error_string>", err);
3420 }
3421 #endif
3422 return ret;
3423 }
3424
3425 bool os::guard_memory(char* addr, size_t bytes) {
3426 DWORD old_status;
3427 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3428 }
3429
3430 bool os::unguard_memory(char* addr, size_t bytes) {
3431 DWORD old_status;
3432 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3433 }
3434
3435 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3436 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3437 void os::numa_make_global(char *addr, size_t bytes) { }
3438 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3439 bool os::numa_topology_changed() { return false; }
3440 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3441 int os::numa_get_group_id() { return 0; }
3442 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3443 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3444 // Provide an answer for UMA systems
3445 ids[0] = 0;
3446 return 1;
3447 } else {
3448 // check for size bigger than actual groups_num
3449 size = MIN2(size, numa_get_groups_num());
3450 for (int i = 0; i < (int)size; i++) {
3451 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3452 }
3453 return size;
3454 }
3455 }
3456
3457 int os::numa_get_group_id_for_address(const void* address) {
3458 return 0;
3459 }
3460
3461 bool os::get_page_info(char *start, page_info* info) {
3462 return false;
3463 }
3464
3465 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3466 page_info* page_found) {
3467 return end;
3468 }
3469
3470 char* os::non_memory_address_word() {
3471 // Must never look like an address returned by reserve_memory,
3472 // even in its subfields (as defined by the CPU immediate fields,
3473 // if the CPU splits constants across multiple instructions).
3474 return (char*)-1;
3475 }
3476
3477 #define MAX_ERROR_COUNT 100
3478 #define SYS_THREAD_ERROR 0xffffffffUL
3479
3480 void os::pd_start_thread(Thread* thread) {
3481 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3482 // Returns previous suspend state:
3483 // 0: Thread was not suspended
3484 // 1: Thread is running now
3485 // >1: Thread is still suspended.
3486 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3487 }
3488
3489
3490 // Short sleep, direct OS call.
3491 //
3492 // ms = 0, means allow others (if any) to run.
3493 //
3494 void os::naked_short_sleep(jlong ms) {
3495 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3496 Sleep(ms);
3497 }
3498
3499 // Windows does not provide sleep functionality with nanosecond resolution, so we
3500 // try to approximate this with spinning combined with yielding if another thread
3501 // is ready to run on the current processor.
3502 void os::naked_short_nanosleep(jlong ns) {
3503 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3504
3505 int64_t start = os::javaTimeNanos();
3506 do {
3507 if (SwitchToThread() == 0) {
3508 // Nothing else is ready to run on this cpu, spin a little
3509 SpinPause();
3510 }
3511 } while (os::javaTimeNanos() - start < ns);
3512 }
3513
3514 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3515 void os::infinite_sleep() {
3516 while (true) { // sleep forever ...
3517 Sleep(100000); // ... 100 seconds at a time
3518 }
3519 }
3520
3521 typedef BOOL (WINAPI * STTSignature)(void);
3522
3523 void os::naked_yield() {
3524 // Consider passing back the return value from SwitchToThread().
3525 SwitchToThread();
3526 }
3527
3528 // Win32 only gives you access to seven real priorities at a time,
3529 // so we compress Java's ten down to seven. It would be better
3530 // if we dynamically adjusted relative priorities.
3531
3532 int os::java_to_os_priority[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_NORMAL, // 6
3540 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3541 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3542 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3543 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3544 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3545 };
3546
3547 int prio_policy1[CriticalPriority + 1] = {
3548 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3549 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3550 THREAD_PRIORITY_LOWEST, // 2
3551 THREAD_PRIORITY_BELOW_NORMAL, // 3
3552 THREAD_PRIORITY_BELOW_NORMAL, // 4
3553 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3554 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3555 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3556 THREAD_PRIORITY_HIGHEST, // 8
3557 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3558 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3559 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3560 };
3561
3562 static int prio_init() {
3563 // If ThreadPriorityPolicy is 1, switch tables
3564 if (ThreadPriorityPolicy == 1) {
3565 int i;
3566 for (i = 0; i < CriticalPriority + 1; i++) {
3567 os::java_to_os_priority[i] = prio_policy1[i];
3568 }
3569 }
3570 if (UseCriticalJavaThreadPriority) {
3571 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3572 }
3573 return 0;
3574 }
3575
3576 OSReturn os::set_native_priority(Thread* thread, int priority) {
3577 if (!UseThreadPriorities) return OS_OK;
3578 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3579 return ret ? OS_OK : OS_ERR;
3580 }
3581
3582 OSReturn os::get_native_priority(const Thread* const thread,
3583 int* priority_ptr) {
3584 if (!UseThreadPriorities) {
3585 *priority_ptr = java_to_os_priority[NormPriority];
3586 return OS_OK;
3587 }
3588 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3589 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3590 assert(false, "GetThreadPriority failed");
3591 return OS_ERR;
3592 }
3593 *priority_ptr = os_prio;
3594 return OS_OK;
3595 }
3596
3597 // GetCurrentThreadId() returns DWORD
3598 intx os::current_thread_id() { return GetCurrentThreadId(); }
3599
3600 static int _initial_pid = 0;
3601
3602 int os::current_process_id() {
3603 return (_initial_pid ? _initial_pid : _getpid());
3604 }
3605
3606 int os::win32::_vm_page_size = 0;
3607 int os::win32::_vm_allocation_granularity = 0;
3608 int os::win32::_processor_type = 0;
3609 // Processor level is not available on non-NT systems, use vm_version instead
3610 int os::win32::_processor_level = 0;
3611 julong os::win32::_physical_memory = 0;
3612 size_t os::win32::_default_stack_size = 0;
3613
3614 intx os::win32::_os_thread_limit = 0;
3615 volatile intx os::win32::_os_thread_count = 0;
3616
3617 bool os::win32::_is_windows_server = false;
3618
3619 // 6573254
3620 // Currently, the bug is observed across all the supported Windows releases,
3621 // including the latest one (as of this writing - Windows Server 2012 R2)
3622 bool os::win32::_has_exit_bug = true;
3623
3624 void os::win32::initialize_system_info() {
3625 SYSTEM_INFO si;
3626 GetSystemInfo(&si);
3627 _vm_page_size = si.dwPageSize;
3628 _vm_allocation_granularity = si.dwAllocationGranularity;
3629 _processor_type = si.dwProcessorType;
3630 _processor_level = si.wProcessorLevel;
3631 set_processor_count(si.dwNumberOfProcessors);
3632
3633 MEMORYSTATUSEX ms;
3634 ms.dwLength = sizeof(ms);
3635
3636 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3637 // dwMemoryLoad (% of memory in use)
3638 GlobalMemoryStatusEx(&ms);
3639 _physical_memory = ms.ullTotalPhys;
3640
3641 if (FLAG_IS_DEFAULT(MaxRAM)) {
3642 // Adjust MaxRAM according to the maximum virtual address space available.
3643 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3644 }
3645
3646 OSVERSIONINFOEX oi;
3647 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3648 GetVersionEx((OSVERSIONINFO*)&oi);
3649 switch (oi.dwPlatformId) {
3650 case VER_PLATFORM_WIN32_NT:
3651 {
3652 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3653 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3654 oi.wProductType == VER_NT_SERVER) {
3655 _is_windows_server = true;
3656 }
3657 }
3658 break;
3659 default: fatal("Unknown platform");
3660 }
3661
3662 _default_stack_size = os::current_stack_size();
3663 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3664 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3665 "stack size not a multiple of page size");
3666
3667 initialize_performance_counter();
3668 }
3669
3670
3671 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3672 int ebuflen) {
3673 char path[MAX_PATH];
3674 DWORD size;
3675 DWORD pathLen = (DWORD)sizeof(path);
3676 HINSTANCE result = NULL;
3677
3678 // only allow library name without path component
3679 assert(strchr(name, '\\') == NULL, "path not allowed");
3680 assert(strchr(name, ':') == NULL, "path not allowed");
3681 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3682 jio_snprintf(ebuf, ebuflen,
3683 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3684 return NULL;
3685 }
3686
3687 // search system directory
3688 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3689 if (size >= pathLen) {
3690 return NULL; // truncated
3691 }
3692 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3693 return NULL; // truncated
3694 }
3695 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3696 return result;
3697 }
3698 }
3699
3700 // try Windows directory
3701 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3702 if (size >= pathLen) {
3703 return NULL; // truncated
3704 }
3705 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3706 return NULL; // truncated
3707 }
3708 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3709 return result;
3710 }
3711 }
3712
3713 jio_snprintf(ebuf, ebuflen,
3714 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3715 return NULL;
3716 }
3717
3718 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3719 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3720
3721 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3722 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3723 return TRUE;
3724 }
3725
3726 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3727 // Basic approach:
3728 // - Each exiting thread registers its intent to exit and then does so.
3729 // - A thread trying to terminate the process must wait for all
3730 // threads currently exiting to complete their exit.
3731
3732 if (os::win32::has_exit_bug()) {
3733 // The array holds handles of the threads that have started exiting by calling
3734 // _endthreadex().
3735 // Should be large enough to avoid blocking the exiting thread due to lack of
3736 // a free slot.
3737 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3738 static int handle_count = 0;
3739
3740 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3741 static CRITICAL_SECTION crit_sect;
3742 static volatile DWORD process_exiting = 0;
3743 int i, j;
3744 DWORD res;
3745 HANDLE hproc, hthr;
3746
3747 // We only attempt to register threads until a process exiting
3748 // thread manages to set the process_exiting flag. Any threads
3749 // that come through here after the process_exiting flag is set
3750 // are unregistered and will be caught in the SuspendThread()
3751 // infinite loop below.
3752 bool registered = false;
3753
3754 // The first thread that reached this point, initializes the critical section.
3755 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3756 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3757 } else if (Atomic::load_acquire(&process_exiting) == 0) {
3758 if (what != EPT_THREAD) {
3759 // Atomically set process_exiting before the critical section
3760 // to increase the visibility between racing threads.
3761 Atomic::cmpxchg(&process_exiting, (DWORD)0, GetCurrentThreadId());
3762 }
3763 EnterCriticalSection(&crit_sect);
3764
3765 if (what == EPT_THREAD && Atomic::load_acquire(&process_exiting) == 0) {
3766 // Remove from the array those handles of the threads that have completed exiting.
3767 for (i = 0, j = 0; i < handle_count; ++i) {
3768 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3769 if (res == WAIT_TIMEOUT) {
3770 handles[j++] = handles[i];
3771 } else {
3772 if (res == WAIT_FAILED) {
3773 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3774 GetLastError(), __FILE__, __LINE__);
3775 }
3776 // Don't keep the handle, if we failed waiting for it.
3777 CloseHandle(handles[i]);
3778 }
3779 }
3780
3781 // If there's no free slot in the array of the kept handles, we'll have to
3782 // wait until at least one thread completes exiting.
3783 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3784 // Raise the priority of the oldest exiting thread to increase its chances
3785 // to complete sooner.
3786 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3787 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3788 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3789 i = (res - WAIT_OBJECT_0);
3790 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3791 for (; i < handle_count; ++i) {
3792 handles[i] = handles[i + 1];
3793 }
3794 } else {
3795 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3796 (res == WAIT_FAILED ? "failed" : "timed out"),
3797 GetLastError(), __FILE__, __LINE__);
3798 // Don't keep handles, if we failed waiting for them.
3799 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3800 CloseHandle(handles[i]);
3801 }
3802 handle_count = 0;
3803 }
3804 }
3805
3806 // Store a duplicate of the current thread handle in the array of handles.
3807 hproc = GetCurrentProcess();
3808 hthr = GetCurrentThread();
3809 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3810 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3811 warning("DuplicateHandle failed (%u) in %s: %d\n",
3812 GetLastError(), __FILE__, __LINE__);
3813
3814 // We can't register this thread (no more handles) so this thread
3815 // may be racing with a thread that is calling exit(). If the thread
3816 // that is calling exit() has managed to set the process_exiting
3817 // flag, then this thread will be caught in the SuspendThread()
3818 // infinite loop below which closes that race. A small timing
3819 // window remains before the process_exiting flag is set, but it
3820 // is only exposed when we are out of handles.
3821 } else {
3822 ++handle_count;
3823 registered = true;
3824
3825 // The current exiting thread has stored its handle in the array, and now
3826 // should leave the critical section before calling _endthreadex().
3827 }
3828
3829 } else if (what != EPT_THREAD && handle_count > 0) {
3830 jlong start_time, finish_time, timeout_left;
3831 // Before ending the process, make sure all the threads that had called
3832 // _endthreadex() completed.
3833
3834 // Set the priority level of the current thread to the same value as
3835 // the priority level of exiting threads.
3836 // This is to ensure it will be given a fair chance to execute if
3837 // the timeout expires.
3838 hthr = GetCurrentThread();
3839 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3840 start_time = os::javaTimeNanos();
3841 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3842 for (i = 0; ; ) {
3843 int portion_count = handle_count - i;
3844 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3845 portion_count = MAXIMUM_WAIT_OBJECTS;
3846 }
3847 for (j = 0; j < portion_count; ++j) {
3848 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3849 }
3850 timeout_left = (finish_time - start_time) / 1000000L;
3851 if (timeout_left < 0) {
3852 timeout_left = 0;
3853 }
3854 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3855 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3856 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3857 (res == WAIT_FAILED ? "failed" : "timed out"),
3858 GetLastError(), __FILE__, __LINE__);
3859 // Reset portion_count so we close the remaining
3860 // handles due to this error.
3861 portion_count = handle_count - i;
3862 }
3863 for (j = 0; j < portion_count; ++j) {
3864 CloseHandle(handles[i + j]);
3865 }
3866 if ((i += portion_count) >= handle_count) {
3867 break;
3868 }
3869 start_time = os::javaTimeNanos();
3870 }
3871 handle_count = 0;
3872 }
3873
3874 LeaveCriticalSection(&crit_sect);
3875 }
3876
3877 if (!registered &&
3878 Atomic::load_acquire(&process_exiting) != 0 &&
3879 process_exiting != GetCurrentThreadId()) {
3880 // Some other thread is about to call exit(), so we don't let
3881 // the current unregistered thread proceed to exit() or _endthreadex()
3882 while (true) {
3883 SuspendThread(GetCurrentThread());
3884 // Avoid busy-wait loop, if SuspendThread() failed.
3885 Sleep(EXIT_TIMEOUT);
3886 }
3887 }
3888 }
3889
3890 // We are here if either
3891 // - there's no 'race at exit' bug on this OS release;
3892 // - initialization of the critical section failed (unlikely);
3893 // - the current thread has registered itself and left the critical section;
3894 // - the process-exiting thread has raised the flag and left the critical section.
3895 if (what == EPT_THREAD) {
3896 _endthreadex((unsigned)exit_code);
3897 } else if (what == EPT_PROCESS) {
3898 ::exit(exit_code);
3899 } else {
3900 _exit(exit_code);
3901 }
3902
3903 // Should not reach here
3904 return exit_code;
3905 }
3906
3907 #undef EXIT_TIMEOUT
3908
3909 void os::win32::setmode_streams() {
3910 _setmode(_fileno(stdin), _O_BINARY);
3911 _setmode(_fileno(stdout), _O_BINARY);
3912 _setmode(_fileno(stderr), _O_BINARY);
3913 }
3914
3915 void os::wait_for_keypress_at_exit(void) {
3916 if (PauseAtExit) {
3917 fprintf(stderr, "Press any key to continue...\n");
3918 fgetc(stdin);
3919 }
3920 }
3921
3922
3923 bool os::message_box(const char* title, const char* message) {
3924 int result = MessageBox(NULL, message, title,
3925 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3926 return result == IDYES;
3927 }
3928
3929 #ifndef PRODUCT
3930 #ifndef _WIN64
3931 // Helpers to check whether NX protection is enabled
3932 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3933 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3934 pex->ExceptionRecord->NumberParameters > 0 &&
3935 pex->ExceptionRecord->ExceptionInformation[0] ==
3936 EXCEPTION_INFO_EXEC_VIOLATION) {
3937 return EXCEPTION_EXECUTE_HANDLER;
3938 }
3939 return EXCEPTION_CONTINUE_SEARCH;
3940 }
3941
3942 void nx_check_protection() {
3943 // If NX is enabled we'll get an exception calling into code on the stack
3944 char code[] = { (char)0xC3 }; // ret
3945 void *code_ptr = (void *)code;
3946 __try {
3947 __asm call code_ptr
3948 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3949 tty->print_raw_cr("NX protection detected.");
3950 }
3951 }
3952 #endif // _WIN64
3953 #endif // PRODUCT
3954
3955 // This is called _before_ the global arguments have been parsed
3956 void os::init(void) {
3957 _initial_pid = _getpid();
3958
3959 init_random(1234567);
3960
3961 win32::initialize_system_info();
3962 win32::setmode_streams();
3963 init_page_sizes((size_t) win32::vm_page_size());
3964
3965 // This may be overridden later when argument processing is done.
3966 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
3967
3968 // Initialize main_process and main_thread
3969 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3970 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3971 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3972 fatal("DuplicateHandle failed\n");
3973 }
3974 main_thread_id = (int) GetCurrentThreadId();
3975
3976 // initialize fast thread access - only used for 32-bit
3977 win32::initialize_thread_ptr_offset();
3978 }
3979
3980 // To install functions for atexit processing
3981 extern "C" {
3982 static void perfMemory_exit_helper() {
3983 perfMemory_exit();
3984 }
3985 }
3986
3987 static jint initSock();
3988
3989 // this is called _after_ the global arguments have been parsed
3990 jint os::init_2(void) {
3991
3992 // This could be set any time but all platforms
3993 // have to set it the same so we have to mirror Solaris.
3994 DEBUG_ONLY(os::set_mutex_init_done();)
3995
3996 // Setup Windows Exceptions
3997
3998 #if INCLUDE_AOT
3999 // If AOT is enabled we need to install a vectored exception handler
4000 // in order to forward implicit exceptions from code in AOT
4001 // generated DLLs. This is necessary since these DLLs are not
4002 // registered for structured exceptions like codecache methods are.
4003 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4004 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4005 }
4006 #endif
4007
4008 // for debugging float code generation bugs
4009 if (ForceFloatExceptions) {
4010 #ifndef _WIN64
4011 static long fp_control_word = 0;
4012 __asm { fstcw fp_control_word }
4013 // see Intel PPro Manual, Vol. 2, p 7-16
4014 const long precision = 0x20;
4015 const long underflow = 0x10;
4016 const long overflow = 0x08;
4017 const long zero_div = 0x04;
4018 const long denorm = 0x02;
4019 const long invalid = 0x01;
4020 fp_control_word |= invalid;
4021 __asm { fldcw fp_control_word }
4022 #endif
4023 }
4024
4025 // If stack_commit_size is 0, windows will reserve the default size,
4026 // but only commit a small portion of it.
4027 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4028 size_t default_reserve_size = os::win32::default_stack_size();
4029 size_t actual_reserve_size = stack_commit_size;
4030 if (stack_commit_size < default_reserve_size) {
4031 // If stack_commit_size == 0, we want this too
4032 actual_reserve_size = default_reserve_size;
4033 }
4034
4035 // Check minimum allowable stack size for thread creation and to initialize
4036 // the java system classes, including StackOverflowError - depends on page
4037 // size. Add two 4K pages for compiler2 recursion in main thread.
4038 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4039 // class initialization depending on 32 or 64 bit VM.
4040 size_t min_stack_allowed =
4041 (size_t)(JavaThread::stack_guard_zone_size() +
4042 JavaThread::stack_shadow_zone_size() +
4043 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4044
4045 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4046
4047 if (actual_reserve_size < min_stack_allowed) {
4048 tty->print_cr("\nThe Java thread stack size specified is too small. "
4049 "Specify at least %dk",
4050 min_stack_allowed / K);
4051 return JNI_ERR;
4052 }
4053
4054 JavaThread::set_stack_size_at_create(stack_commit_size);
4055
4056 // Calculate theoretical max. size of Threads to guard gainst artifical
4057 // out-of-memory situations, where all available address-space has been
4058 // reserved by thread stacks.
4059 assert(actual_reserve_size != 0, "Must have a stack");
4060
4061 // Calculate the thread limit when we should start doing Virtual Memory
4062 // banging. Currently when the threads will have used all but 200Mb of space.
4063 //
4064 // TODO: consider performing a similar calculation for commit size instead
4065 // as reserve size, since on a 64-bit platform we'll run into that more
4066 // often than running out of virtual memory space. We can use the
4067 // lower value of the two calculations as the os_thread_limit.
4068 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4069 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4070
4071 // at exit methods are called in the reverse order of their registration.
4072 // there is no limit to the number of functions registered. atexit does
4073 // not set errno.
4074
4075 if (PerfAllowAtExitRegistration) {
4076 // only register atexit functions if PerfAllowAtExitRegistration is set.
4077 // atexit functions can be delayed until process exit time, which
4078 // can be problematic for embedded VM situations. Embedded VMs should
4079 // call DestroyJavaVM() to assure that VM resources are released.
4080
4081 // note: perfMemory_exit_helper atexit function may be removed in
4082 // the future if the appropriate cleanup code can be added to the
4083 // VM_Exit VMOperation's doit method.
4084 if (atexit(perfMemory_exit_helper) != 0) {
4085 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4086 }
4087 }
4088
4089 #ifndef _WIN64
4090 // Print something if NX is enabled (win32 on AMD64)
4091 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4092 #endif
4093
4094 // initialize thread priority policy
4095 prio_init();
4096
4097 if (UseNUMA && !ForceNUMA) {
4098 UseNUMA = false; // We don't fully support this yet
4099 }
4100
4101 if (UseNUMAInterleaving) {
4102 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4103 bool success = numa_interleaving_init();
4104 if (!success) UseNUMAInterleaving = false;
4105 }
4106
4107 if (initSock() != JNI_OK) {
4108 return JNI_ERR;
4109 }
4110
4111 SymbolEngine::recalc_search_path();
4112
4113 // Initialize data for jdk.internal.misc.Signal
4114 if (!ReduceSignalUsage) {
4115 jdk_misc_signal_init();
4116 }
4117
4118 return JNI_OK;
4119 }
4120
4121 // Mark the polling page as unreadable
4122 void os::make_polling_page_unreadable(void) {
4123 DWORD old_status;
4124 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4125 PAGE_NOACCESS, &old_status)) {
4126 fatal("Could not disable polling page");
4127 }
4128 }
4129
4130 // Mark the polling page as readable
4131 void os::make_polling_page_readable(void) {
4132 DWORD old_status;
4133 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4134 PAGE_READONLY, &old_status)) {
4135 fatal("Could not enable polling page");
4136 }
4137 }
4138
4139 // combine the high and low DWORD into a ULONGLONG
4140 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4141 ULONGLONG value = high_word;
4142 value <<= sizeof(high_word) * 8;
4143 value |= low_word;
4144 return value;
4145 }
4146
4147 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4148 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4149 ::memset((void*)sbuf, 0, sizeof(struct stat));
4150 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4151 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4152 file_data.ftLastWriteTime.dwLowDateTime);
4153 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4154 file_data.ftCreationTime.dwLowDateTime);
4155 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4156 file_data.ftLastAccessTime.dwLowDateTime);
4157 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4158 sbuf->st_mode |= S_IFDIR;
4159 } else {
4160 sbuf->st_mode |= S_IFREG;
4161 }
4162 }
4163
4164 // Returns the given path as an absolute wide path in unc format. The returned path is NULL
4165 // on error (with err being set accordingly) and should be freed via os::free() otherwise.
4166 // additional_space is the number of additionally allocated wchars after the terminating L'\0'.
4167 // This is based on pathToNTPath() in io_util_md.cpp, but omits the optimizations for
4168 // short paths.
4169 static LPWSTR wide_abs_unc_path(char const* path, errno_t & err, int additional_space = 0) {
4170 if ((path == NULL) || (path[0] == '\0')) {
4171 err = ENOENT;
4172 return NULL;
4173 }
4174
4175 // Need to allocate at least room for 3 characters, since os::native_path transforms C: to C:.
4176 size_t buf_size = 1 + MAX2((size_t)3, strlen(path));
4177 char* buf = static_cast<char*>(os::malloc(buf_size, mtInternal));
4178 if (buf == NULL) {
4179 err = ENOMEM;
4180 return NULL;
4181 }
4182 memcpy(buf, path, buf_size);
4183 os::native_path(buf);
4184
4185 // Get required buffer size to convert to Unicode
4186 int unicode_path_len = MultiByteToWideChar(CP_THREAD_ACP,
4187 MB_ERR_INVALID_CHARS,
4188 buf, -1,
4189 NULL, 0);
4190 if (unicode_path_len == 0) {
4191 os::free(buf);
4192 err = EINVAL;
4193 return NULL;
4194 }
4195
4196 LPWSTR prefix;
4197 int prefix_off = 0;
4198 bool needs_fullpath = true;
4199
4200 if (::isalpha(buf[0]) && !::IsDBCSLeadByte(buf[0]) && buf[1] == ':' && buf[2] == '\\') {
4201 prefix = L"\\\\?\\";
4202 } else if (buf[0] == '\\' && buf[1] == '\\') {
4203 if (buf[2] == '?' && buf[3] == '\\') {
4204 prefix = L"";
4205 needs_fullpath = false;
4206 } else {
4207 prefix = L"\\\\?\\UNC";
4208 prefix_off = 1; // Overwrite the first char with the prefix, so \\share\path becomes \\?\UNC\share\path
4209 }
4210 } else {
4211 prefix = L"\\\\?\\";
4212 }
4213 size_t prefix_len = wcslen(prefix);
4214 LPWSTR result = NULL;
4215
4216 LPWSTR unicode_path = static_cast<LPWSTR>(os::malloc(sizeof(WCHAR) * unicode_path_len, mtInternal));
4217 if (unicode_path == NULL) {
4218 err = ENOMEM;
4219 } else {
4220 // This call would be success because it is checked in above
4221 err = ERROR_SUCCESS;
4222 MultiByteToWideChar(CP_THREAD_ACP,
4223 MB_ERR_INVALID_CHARS,
4224 buf, -1,
4225 unicode_path, unicode_path_len);
4226
4227 size_t result_len = prefix_len + prefix_off + additional_space;
4228 if (needs_fullpath) {
4229 // Get required buffer size to convert to full path
4230 DWORD full_path_len = GetFullPathNameW(unicode_path, 0, NULL, NULL);
4231 if (full_path_len == 0) {
4232 err = EINVAL;
4233 } else {
4234 size_t result_size = sizeof(WCHAR) * (result_len + full_path_len);
4235 result = static_cast<LPWSTR>(os::malloc(result_size, mtInternal));
4236 if (result == NULL) {
4237 err = ENOMEM;
4238 } else {
4239 // Copy prefix
4240 memcpy(result, prefix, sizeof(WCHAR) * prefix_len);
4241 // This call would be success because it is checked in above
4242 GetFullPathNameW(unicode_path, full_path_len, result + prefix_len - prefix_off, NULL);
4243 }
4244 }
4245 } else {
4246 size_t result_size = sizeof(WCHAR) * (result_len + unicode_path_len);
4247 result = static_cast<LPWSTR>(os::malloc(result_size, mtInternal));
4248 if (result == NULL) {
4249 err = ENOMEM;
4250 } else {
4251 // Copy prefix
4252 memcpy(result, prefix, sizeof(WCHAR) * prefix_len);
4253 // Copy unicode path
4254 memcpy(result + prefix_len - prefix_off, unicode_path, sizeof(WCHAR) * unicode_path_len);
4255 }
4256 }
4257
4258 // Remove trailing pathsep (not for \\?\<DRIVE>:\, since it would make it relative)
4259 result_len = wcslen(result);
4260
4261 if (result[result_len - 1] == L'\\') {
4262 if (!(::iswalpha(result[4]) && result[5] == L':' && result_len == 7)) {
4263 result[result_len - 1] = L'\0';
4264 }
4265 }
4266 }
4267
4268 os::free(unicode_path);
4269 os::free(buf);
4270
4271 if (err != ERROR_SUCCESS) {
4272 os::free(result);
4273 result = NULL;
4274 }
4275
4276 return result;
4277 }
4278
4279 int os::stat(const char *path, struct stat *sbuf) {
4280 errno_t err;
4281 wchar_t* wide_path = wide_abs_unc_path(path, err);
4282
4283 if (wide_path == NULL) {
4284 errno = err;
4285 return -1;
4286 }
4287
4288 WIN32_FILE_ATTRIBUTE_DATA file_data;;
4289 BOOL bret = ::GetFileAttributesExW(wide_path, GetFileExInfoStandard, &file_data);
4290 os::free(wide_path);
4291
4292 if (!bret) {
4293 errno = ::GetLastError();
4294 return -1;
4295 }
4296
4297 file_attribute_data_to_stat(sbuf, file_data);
4298 return 0;
4299 }
4300
4301 static HANDLE create_read_only_file_handle(const char* file) {
4302 errno_t err;
4303 wchar_t* wide_path = wide_abs_unc_path(file, err);
4304
4305 if (wide_path == NULL) {
4306 errno = err;
4307 return INVALID_HANDLE_VALUE;
4308 }
4309
4310 HANDLE handle = ::CreateFileW(wide_path, 0, FILE_SHARE_READ,
4311 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4312 os::free(wide_path);
4313
4314 return handle;
4315 }
4316
4317 bool os::same_files(const char* file1, const char* file2) {
4318
4319 if (file1 == NULL && file2 == NULL) {
4320 return true;
4321 }
4322
4323 if (file1 == NULL || file2 == NULL) {
4324 return false;
4325 }
4326
4327 if (strcmp(file1, file2) == 0) {
4328 return true;
4329 }
4330
4331 HANDLE handle1 = create_read_only_file_handle(file1);
4332 HANDLE handle2 = create_read_only_file_handle(file2);
4333 bool result = false;
4334
4335 // if we could open both paths...
4336 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4337 BY_HANDLE_FILE_INFORMATION fileInfo1;
4338 BY_HANDLE_FILE_INFORMATION fileInfo2;
4339 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4340 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4341 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4342 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4343 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4344 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4345 result = true;
4346 }
4347 }
4348 }
4349
4350 //free the handles
4351 if (handle1 != INVALID_HANDLE_VALUE) {
4352 ::CloseHandle(handle1);
4353 }
4354
4355 if (handle2 != INVALID_HANDLE_VALUE) {
4356 ::CloseHandle(handle2);
4357 }
4358
4359 return result;
4360 }
4361
4362 #define FT2INT64(ft) \
4363 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4364
4365
4366 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4367 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4368 // of a thread.
4369 //
4370 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4371 // the fast estimate available on the platform.
4372
4373 // current_thread_cpu_time() is not optimized for Windows yet
4374 jlong os::current_thread_cpu_time() {
4375 // return user + sys since the cost is the same
4376 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4377 }
4378
4379 jlong os::thread_cpu_time(Thread* thread) {
4380 // consistent with what current_thread_cpu_time() returns.
4381 return os::thread_cpu_time(thread, true /* user+sys */);
4382 }
4383
4384 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4385 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4386 }
4387
4388 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4389 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4390 // If this function changes, os::is_thread_cpu_time_supported() should too
4391 FILETIME CreationTime;
4392 FILETIME ExitTime;
4393 FILETIME KernelTime;
4394 FILETIME UserTime;
4395
4396 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4397 &ExitTime, &KernelTime, &UserTime) == 0) {
4398 return -1;
4399 } else if (user_sys_cpu_time) {
4400 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4401 } else {
4402 return FT2INT64(UserTime) * 100;
4403 }
4404 }
4405
4406 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4407 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4408 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4409 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4410 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4411 }
4412
4413 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4414 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4415 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4416 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4417 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4418 }
4419
4420 bool os::is_thread_cpu_time_supported() {
4421 // see os::thread_cpu_time
4422 FILETIME CreationTime;
4423 FILETIME ExitTime;
4424 FILETIME KernelTime;
4425 FILETIME UserTime;
4426
4427 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4428 &KernelTime, &UserTime) == 0) {
4429 return false;
4430 } else {
4431 return true;
4432 }
4433 }
4434
4435 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4436 // It does have primitives (PDH API) to get CPU usage and run queue length.
4437 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4438 // If we wanted to implement loadavg on Windows, we have a few options:
4439 //
4440 // a) Query CPU usage and run queue length and "fake" an answer by
4441 // returning the CPU usage if it's under 100%, and the run queue
4442 // length otherwise. It turns out that querying is pretty slow
4443 // on Windows, on the order of 200 microseconds on a fast machine.
4444 // Note that on the Windows the CPU usage value is the % usage
4445 // since the last time the API was called (and the first call
4446 // returns 100%), so we'd have to deal with that as well.
4447 //
4448 // b) Sample the "fake" answer using a sampling thread and store
4449 // the answer in a global variable. The call to loadavg would
4450 // just return the value of the global, avoiding the slow query.
4451 //
4452 // c) Sample a better answer using exponential decay to smooth the
4453 // value. This is basically the algorithm used by UNIX kernels.
4454 //
4455 // Note that sampling thread starvation could affect both (b) and (c).
4456 int os::loadavg(double loadavg[], int nelem) {
4457 return -1;
4458 }
4459
4460
4461 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4462 bool os::dont_yield() {
4463 return DontYieldALot;
4464 }
4465
4466 int os::open(const char *path, int oflag, int mode) {
4467 errno_t err;
4468 wchar_t* wide_path = wide_abs_unc_path(path, err);
4469
4470 if (wide_path == NULL) {
4471 errno = err;
4472 return -1;
4473 }
4474 int fd = ::_wopen(wide_path, oflag | O_BINARY | O_NOINHERIT, mode);
4475 os::free(wide_path);
4476
4477 if (fd == -1) {
4478 errno = ::GetLastError();
4479 }
4480
4481 return fd;
4482 }
4483
4484 FILE* os::open(int fd, const char* mode) {
4485 return ::_fdopen(fd, mode);
4486 }
4487
4488 // Is a (classpath) directory empty?
4489 bool os::dir_is_empty(const char* path) {
4490 errno_t err;
4491 wchar_t* wide_path = wide_abs_unc_path(path, err, 2);
4492
4493 if (wide_path == NULL) {
4494 errno = err;
4495 return false;
4496 }
4497
4498 // Make sure we end with "\\*"
4499 if (wide_path[wcslen(wide_path) - 1] == L'\\') {
4500 wcscat(wide_path, L"*");
4501 } else {
4502 wcscat(wide_path, L"\\*");
4503 }
4504
4505 WIN32_FIND_DATAW fd;
4506 HANDLE f = ::FindFirstFileW(wide_path, &fd);
4507 os::free(wide_path);
4508 bool is_empty = true;
4509
4510 if (f != INVALID_HANDLE_VALUE) {
4511 while (is_empty && ::FindNextFileW(f, &fd)) {
4512 // An empty directory contains only the current directory file
4513 // and the previous directory file.
4514 if ((wcscmp(fd.cFileName, L".") != 0) &&
4515 (wcscmp(fd.cFileName, L"..") != 0)) {
4516 is_empty = false;
4517 }
4518 }
4519 FindClose(f);
4520 } else {
4521 errno = ::GetLastError();
4522 }
4523
4524 return is_empty;
4525 }
4526
4527 // create binary file, rewriting existing file if required
4528 int os::create_binary_file(const char* path, bool rewrite_existing) {
4529 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4530 if (!rewrite_existing) {
4531 oflags |= _O_EXCL;
4532 }
4533 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4534 }
4535
4536 // return current position of file pointer
4537 jlong os::current_file_offset(int fd) {
4538 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4539 }
4540
4541 // move file pointer to the specified offset
4542 jlong os::seek_to_file_offset(int fd, jlong offset) {
4543 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4544 }
4545
4546
4547 jlong os::lseek(int fd, jlong offset, int whence) {
4548 return (jlong) ::_lseeki64(fd, offset, whence);
4549 }
4550
4551 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4552 OVERLAPPED ov;
4553 DWORD nread;
4554 BOOL result;
4555
4556 ZeroMemory(&ov, sizeof(ov));
4557 ov.Offset = (DWORD)offset;
4558 ov.OffsetHigh = (DWORD)(offset >> 32);
4559
4560 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4561
4562 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4563
4564 return result ? nread : 0;
4565 }
4566
4567
4568 // This method is a slightly reworked copy of JDK's sysNativePath
4569 // from src/windows/hpi/src/path_md.c
4570
4571 // Convert a pathname to native format. On win32, this involves forcing all
4572 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4573 // sometimes rejects '/') and removing redundant separators. The input path is
4574 // assumed to have been converted into the character encoding used by the local
4575 // system. Because this might be a double-byte encoding, care is taken to
4576 // treat double-byte lead characters correctly.
4577 //
4578 // This procedure modifies the given path in place, as the result is never
4579 // longer than the original. There is no error return; this operation always
4580 // succeeds.
4581 char * os::native_path(char *path) {
4582 char *src = path, *dst = path, *end = path;
4583 char *colon = NULL; // If a drive specifier is found, this will
4584 // point to the colon following the drive letter
4585
4586 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4587 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4588 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4589
4590 // Check for leading separators
4591 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4592 while (isfilesep(*src)) {
4593 src++;
4594 }
4595
4596 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4597 // Remove leading separators if followed by drive specifier. This
4598 // hack is necessary to support file URLs containing drive
4599 // specifiers (e.g., "file://c:/path"). As a side effect,
4600 // "/c:/path" can be used as an alternative to "c:/path".
4601 *dst++ = *src++;
4602 colon = dst;
4603 *dst++ = ':';
4604 src++;
4605 } else {
4606 src = path;
4607 if (isfilesep(src[0]) && isfilesep(src[1])) {
4608 // UNC pathname: Retain first separator; leave src pointed at
4609 // second separator so that further separators will be collapsed
4610 // into the second separator. The result will be a pathname
4611 // beginning with "\\\\" followed (most likely) by a host name.
4612 src = dst = path + 1;
4613 path[0] = '\\'; // Force first separator to '\\'
4614 }
4615 }
4616
4617 end = dst;
4618
4619 // Remove redundant separators from remainder of path, forcing all
4620 // separators to be '\\' rather than '/'. Also, single byte space
4621 // characters are removed from the end of the path because those
4622 // are not legal ending characters on this operating system.
4623 //
4624 while (*src != '\0') {
4625 if (isfilesep(*src)) {
4626 *dst++ = '\\'; src++;
4627 while (isfilesep(*src)) src++;
4628 if (*src == '\0') {
4629 // Check for trailing separator
4630 end = dst;
4631 if (colon == dst - 2) break; // "z:\\"
4632 if (dst == path + 1) break; // "\\"
4633 if (dst == path + 2 && isfilesep(path[0])) {
4634 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4635 // beginning of a UNC pathname. Even though it is not, by
4636 // itself, a valid UNC pathname, we leave it as is in order
4637 // to be consistent with the path canonicalizer as well
4638 // as the win32 APIs, which treat this case as an invalid
4639 // UNC pathname rather than as an alias for the root
4640 // directory of the current drive.
4641 break;
4642 }
4643 end = --dst; // Path does not denote a root directory, so
4644 // remove trailing separator
4645 break;
4646 }
4647 end = dst;
4648 } else {
4649 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4650 *dst++ = *src++;
4651 if (*src) *dst++ = *src++;
4652 end = dst;
4653 } else { // Copy a single-byte character
4654 char c = *src++;
4655 *dst++ = c;
4656 // Space is not a legal ending character
4657 if (c != ' ') end = dst;
4658 }
4659 }
4660 }
4661
4662 *end = '\0';
4663
4664 // For "z:", add "." to work around a bug in the C runtime library
4665 if (colon == dst - 1) {
4666 path[2] = '.';
4667 path[3] = '\0';
4668 }
4669
4670 return path;
4671 }
4672
4673 // This code is a copy of JDK's sysSetLength
4674 // from src/windows/hpi/src/sys_api_md.c
4675
4676 int os::ftruncate(int fd, jlong length) {
4677 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4678 long high = (long)(length >> 32);
4679 DWORD ret;
4680
4681 if (h == (HANDLE)(-1)) {
4682 return -1;
4683 }
4684
4685 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4686 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4687 return -1;
4688 }
4689
4690 if (::SetEndOfFile(h) == FALSE) {
4691 return -1;
4692 }
4693
4694 return 0;
4695 }
4696
4697 int os::get_fileno(FILE* fp) {
4698 return _fileno(fp);
4699 }
4700
4701 // This code is a copy of JDK's sysSync
4702 // from src/windows/hpi/src/sys_api_md.c
4703 // except for the legacy workaround for a bug in Win 98
4704
4705 int os::fsync(int fd) {
4706 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4707
4708 if ((!::FlushFileBuffers(handle)) &&
4709 (GetLastError() != ERROR_ACCESS_DENIED)) {
4710 // from winerror.h
4711 return -1;
4712 }
4713 return 0;
4714 }
4715
4716 static int nonSeekAvailable(int, long *);
4717 static int stdinAvailable(int, long *);
4718
4719 // This code is a copy of JDK's sysAvailable
4720 // from src/windows/hpi/src/sys_api_md.c
4721
4722 int os::available(int fd, jlong *bytes) {
4723 jlong cur, end;
4724 struct _stati64 stbuf64;
4725
4726 if (::_fstati64(fd, &stbuf64) >= 0) {
4727 int mode = stbuf64.st_mode;
4728 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4729 int ret;
4730 long lpbytes;
4731 if (fd == 0) {
4732 ret = stdinAvailable(fd, &lpbytes);
4733 } else {
4734 ret = nonSeekAvailable(fd, &lpbytes);
4735 }
4736 (*bytes) = (jlong)(lpbytes);
4737 return ret;
4738 }
4739 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4740 return FALSE;
4741 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4742 return FALSE;
4743 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4744 return FALSE;
4745 }
4746 *bytes = end - cur;
4747 return TRUE;
4748 } else {
4749 return FALSE;
4750 }
4751 }
4752
4753 void os::flockfile(FILE* fp) {
4754 _lock_file(fp);
4755 }
4756
4757 void os::funlockfile(FILE* fp) {
4758 _unlock_file(fp);
4759 }
4760
4761 // This code is a copy of JDK's nonSeekAvailable
4762 // from src/windows/hpi/src/sys_api_md.c
4763
4764 static int nonSeekAvailable(int fd, long *pbytes) {
4765 // This is used for available on non-seekable devices
4766 // (like both named and anonymous pipes, such as pipes
4767 // connected to an exec'd process).
4768 // Standard Input is a special case.
4769 HANDLE han;
4770
4771 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4772 return FALSE;
4773 }
4774
4775 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4776 // PeekNamedPipe fails when at EOF. In that case we
4777 // simply make *pbytes = 0 which is consistent with the
4778 // behavior we get on Solaris when an fd is at EOF.
4779 // The only alternative is to raise an Exception,
4780 // which isn't really warranted.
4781 //
4782 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4783 return FALSE;
4784 }
4785 *pbytes = 0;
4786 }
4787 return TRUE;
4788 }
4789
4790 #define MAX_INPUT_EVENTS 2000
4791
4792 // This code is a copy of JDK's stdinAvailable
4793 // from src/windows/hpi/src/sys_api_md.c
4794
4795 static int stdinAvailable(int fd, long *pbytes) {
4796 HANDLE han;
4797 DWORD numEventsRead = 0; // Number of events read from buffer
4798 DWORD numEvents = 0; // Number of events in buffer
4799 DWORD i = 0; // Loop index
4800 DWORD curLength = 0; // Position marker
4801 DWORD actualLength = 0; // Number of bytes readable
4802 BOOL error = FALSE; // Error holder
4803 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4804
4805 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4806 return FALSE;
4807 }
4808
4809 // Construct an array of input records in the console buffer
4810 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4811 if (error == 0) {
4812 return nonSeekAvailable(fd, pbytes);
4813 }
4814
4815 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4816 if (numEvents > MAX_INPUT_EVENTS) {
4817 numEvents = MAX_INPUT_EVENTS;
4818 }
4819
4820 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4821 if (lpBuffer == NULL) {
4822 return FALSE;
4823 }
4824
4825 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4826 if (error == 0) {
4827 os::free(lpBuffer);
4828 return FALSE;
4829 }
4830
4831 // Examine input records for the number of bytes available
4832 for (i=0; i<numEvents; i++) {
4833 if (lpBuffer[i].EventType == KEY_EVENT) {
4834
4835 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4836 &(lpBuffer[i].Event);
4837 if (keyRecord->bKeyDown == TRUE) {
4838 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4839 curLength++;
4840 if (*keyPressed == '\r') {
4841 actualLength = curLength;
4842 }
4843 }
4844 }
4845 }
4846
4847 if (lpBuffer != NULL) {
4848 os::free(lpBuffer);
4849 }
4850
4851 *pbytes = (long) actualLength;
4852 return TRUE;
4853 }
4854
4855 // Map a block of memory.
4856 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4857 char *addr, size_t bytes, bool read_only,
4858 bool allow_exec) {
4859 HANDLE hFile;
4860 char* base;
4861
4862 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4863 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4864 if (hFile == NULL) {
4865 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4866 return NULL;
4867 }
4868
4869 if (allow_exec) {
4870 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4871 // unless it comes from a PE image (which the shared archive is not.)
4872 // Even VirtualProtect refuses to give execute access to mapped memory
4873 // that was not previously executable.
4874 //
4875 // Instead, stick the executable region in anonymous memory. Yuck.
4876 // Penalty is that ~4 pages will not be shareable - in the future
4877 // we might consider DLLizing the shared archive with a proper PE
4878 // header so that mapping executable + sharing is possible.
4879
4880 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4881 PAGE_READWRITE);
4882 if (base == NULL) {
4883 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4884 CloseHandle(hFile);
4885 return NULL;
4886 }
4887
4888 // Record virtual memory allocation
4889 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
4890
4891 DWORD bytes_read;
4892 OVERLAPPED overlapped;
4893 overlapped.Offset = (DWORD)file_offset;
4894 overlapped.OffsetHigh = 0;
4895 overlapped.hEvent = NULL;
4896 // ReadFile guarantees that if the return value is true, the requested
4897 // number of bytes were read before returning.
4898 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4899 if (!res) {
4900 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4901 release_memory(base, bytes);
4902 CloseHandle(hFile);
4903 return NULL;
4904 }
4905 } else {
4906 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4907 NULL /* file_name */);
4908 if (hMap == NULL) {
4909 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4910 CloseHandle(hFile);
4911 return NULL;
4912 }
4913
4914 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4915 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4916 (DWORD)bytes, addr);
4917 if (base == NULL) {
4918 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4919 CloseHandle(hMap);
4920 CloseHandle(hFile);
4921 return NULL;
4922 }
4923
4924 if (CloseHandle(hMap) == 0) {
4925 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4926 CloseHandle(hFile);
4927 return base;
4928 }
4929 }
4930
4931 if (allow_exec) {
4932 DWORD old_protect;
4933 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4934 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4935
4936 if (!res) {
4937 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4938 // Don't consider this a hard error, on IA32 even if the
4939 // VirtualProtect fails, we should still be able to execute
4940 CloseHandle(hFile);
4941 return base;
4942 }
4943 }
4944
4945 if (CloseHandle(hFile) == 0) {
4946 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4947 return base;
4948 }
4949
4950 return base;
4951 }
4952
4953
4954 // Remap a block of memory.
4955 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4956 char *addr, size_t bytes, bool read_only,
4957 bool allow_exec) {
4958 // This OS does not allow existing memory maps to be remapped so we
4959 // would have to unmap the memory before we remap it.
4960
4961 // Because there is a small window between unmapping memory and mapping
4962 // it in again with different protections, CDS archives are mapped RW
4963 // on windows, so this function isn't called.
4964 ShouldNotReachHere();
4965 return NULL;
4966 }
4967
4968
4969 // Unmap a block of memory.
4970 // Returns true=success, otherwise false.
4971
4972 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4973 MEMORY_BASIC_INFORMATION mem_info;
4974 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4975 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4976 return false;
4977 }
4978
4979 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4980 // Instead, executable region was allocated using VirtualAlloc(). See
4981 // pd_map_memory() above.
4982 //
4983 // The following flags should match the 'exec_access' flages used for
4984 // VirtualProtect() in pd_map_memory().
4985 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4986 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4987 return pd_release_memory(addr, bytes);
4988 }
4989
4990 BOOL result = UnmapViewOfFile(addr);
4991 if (result == 0) {
4992 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4993 return false;
4994 }
4995 return true;
4996 }
4997
4998 void os::pause() {
4999 char filename[MAX_PATH];
5000 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5001 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
5002 } else {
5003 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5004 }
5005
5006 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5007 if (fd != -1) {
5008 struct stat buf;
5009 ::close(fd);
5010 while (::stat(filename, &buf) == 0) {
5011 Sleep(100);
5012 }
5013 } else {
5014 jio_fprintf(stderr,
5015 "Could not open pause file '%s', continuing immediately.\n", filename);
5016 }
5017 }
5018
5019 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5020 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5021 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5022
5023 os::ThreadCrashProtection::ThreadCrashProtection() {
5024 }
5025
5026 // See the caveats for this class in os_windows.hpp
5027 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5028 // into this method and returns false. If no OS EXCEPTION was raised, returns
5029 // true.
5030 // The callback is supposed to provide the method that should be protected.
5031 //
5032 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5033
5034 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5035
5036 _protected_thread = Thread::current_or_null();
5037 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5038
5039 bool success = true;
5040 __try {
5041 _crash_protection = this;
5042 cb.call();
5043 } __except(EXCEPTION_EXECUTE_HANDLER) {
5044 // only for protection, nothing to do
5045 success = false;
5046 }
5047 _crash_protection = NULL;
5048 _protected_thread = NULL;
5049 Thread::muxRelease(&_crash_mux);
5050 return success;
5051 }
5052
5053
5054 class HighResolutionInterval : public CHeapObj<mtThread> {
5055 // The default timer resolution seems to be 10 milliseconds.
5056 // (Where is this written down?)
5057 // If someone wants to sleep for only a fraction of the default,
5058 // then we set the timer resolution down to 1 millisecond for
5059 // the duration of their interval.
5060 // We carefully set the resolution back, since otherwise we
5061 // seem to incur an overhead (3%?) that we don't need.
5062 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5063 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5064 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5065 // timeBeginPeriod() if the relative error exceeded some threshold.
5066 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5067 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5068 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5069 // resolution timers running.
5070 private:
5071 jlong resolution;
5072 public:
5073 HighResolutionInterval(jlong ms) {
5074 resolution = ms % 10L;
5075 if (resolution != 0) {
5076 MMRESULT result = timeBeginPeriod(1L);
5077 }
5078 }
5079 ~HighResolutionInterval() {
5080 if (resolution != 0) {
5081 MMRESULT result = timeEndPeriod(1L);
5082 }
5083 resolution = 0L;
5084 }
5085 };
5086
5087 // An Event wraps a win32 "CreateEvent" kernel handle.
5088 //
5089 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5090 //
5091 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5092 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5093 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5094 // In addition, an unpark() operation might fetch the handle field, but the
5095 // event could recycle between the fetch and the SetEvent() operation.
5096 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5097 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5098 // on an stale but recycled handle would be harmless, but in practice this might
5099 // confuse other non-Sun code, so it's not a viable approach.
5100 //
5101 // 2: Once a win32 event handle is associated with an Event, it remains associated
5102 // with the Event. The event handle is never closed. This could be construed
5103 // as handle leakage, but only up to the maximum # of threads that have been extant
5104 // at any one time. This shouldn't be an issue, as windows platforms typically
5105 // permit a process to have hundreds of thousands of open handles.
5106 //
5107 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5108 // and release unused handles.
5109 //
5110 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5111 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5112 //
5113 // 5. Use an RCU-like mechanism (Read-Copy Update).
5114 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5115 //
5116 // We use (2).
5117 //
5118 // TODO-FIXME:
5119 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5120 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5121 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5122 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5123 // into a single win32 CreateEvent() handle.
5124 //
5125 // Assumption:
5126 // Only one parker can exist on an event, which is why we allocate
5127 // them per-thread. Multiple unparkers can coexist.
5128 //
5129 // _Event transitions in park()
5130 // -1 => -1 : illegal
5131 // 1 => 0 : pass - return immediately
5132 // 0 => -1 : block; then set _Event to 0 before returning
5133 //
5134 // _Event transitions in unpark()
5135 // 0 => 1 : just return
5136 // 1 => 1 : just return
5137 // -1 => either 0 or 1; must signal target thread
5138 // That is, we can safely transition _Event from -1 to either
5139 // 0 or 1.
5140 //
5141 // _Event serves as a restricted-range semaphore.
5142 // -1 : thread is blocked, i.e. there is a waiter
5143 // 0 : neutral: thread is running or ready,
5144 // could have been signaled after a wait started
5145 // 1 : signaled - thread is running or ready
5146 //
5147 // Another possible encoding of _Event would be with
5148 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5149 //
5150
5151 int os::PlatformEvent::park(jlong Millis) {
5152 // Transitions for _Event:
5153 // -1 => -1 : illegal
5154 // 1 => 0 : pass - return immediately
5155 // 0 => -1 : block; then set _Event to 0 before returning
5156
5157 guarantee(_ParkHandle != NULL , "Invariant");
5158 guarantee(Millis > 0 , "Invariant");
5159
5160 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5161 // the initial park() operation.
5162 // Consider: use atomic decrement instead of CAS-loop
5163
5164 int v;
5165 for (;;) {
5166 v = _Event;
5167 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5168 }
5169 guarantee((v == 0) || (v == 1), "invariant");
5170 if (v != 0) return OS_OK;
5171
5172 // Do this the hard way by blocking ...
5173 // TODO: consider a brief spin here, gated on the success of recent
5174 // spin attempts by this thread.
5175 //
5176 // We decompose long timeouts into series of shorter timed waits.
5177 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5178 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5179 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5180 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5181 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5182 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5183 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5184 // for the already waited time. This policy does not admit any new outcomes.
5185 // In the future, however, we might want to track the accumulated wait time and
5186 // adjust Millis accordingly if we encounter a spurious wakeup.
5187
5188 const int MAXTIMEOUT = 0x10000000;
5189 DWORD rv = WAIT_TIMEOUT;
5190 while (_Event < 0 && Millis > 0) {
5191 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5192 if (Millis > MAXTIMEOUT) {
5193 prd = MAXTIMEOUT;
5194 }
5195 HighResolutionInterval *phri = NULL;
5196 if (!ForceTimeHighResolution) {
5197 phri = new HighResolutionInterval(prd);
5198 }
5199 rv = ::WaitForSingleObject(_ParkHandle, prd);
5200 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5201 if (rv == WAIT_TIMEOUT) {
5202 Millis -= prd;
5203 }
5204 delete phri; // if it is NULL, harmless
5205 }
5206 v = _Event;
5207 _Event = 0;
5208 // see comment at end of os::PlatformEvent::park() below:
5209 OrderAccess::fence();
5210 // If we encounter a nearly simultanous timeout expiry and unpark()
5211 // we return OS_OK indicating we awoke via unpark().
5212 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5213 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5214 }
5215
5216 void os::PlatformEvent::park() {
5217 // Transitions for _Event:
5218 // -1 => -1 : illegal
5219 // 1 => 0 : pass - return immediately
5220 // 0 => -1 : block; then set _Event to 0 before returning
5221
5222 guarantee(_ParkHandle != NULL, "Invariant");
5223 // Invariant: Only the thread associated with the Event/PlatformEvent
5224 // may call park().
5225 // Consider: use atomic decrement instead of CAS-loop
5226 int v;
5227 for (;;) {
5228 v = _Event;
5229 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5230 }
5231 guarantee((v == 0) || (v == 1), "invariant");
5232 if (v != 0) return;
5233
5234 // Do this the hard way by blocking ...
5235 // TODO: consider a brief spin here, gated on the success of recent
5236 // spin attempts by this thread.
5237 while (_Event < 0) {
5238 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5239 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5240 }
5241
5242 // Usually we'll find _Event == 0 at this point, but as
5243 // an optional optimization we clear it, just in case can
5244 // multiple unpark() operations drove _Event up to 1.
5245 _Event = 0;
5246 OrderAccess::fence();
5247 guarantee(_Event >= 0, "invariant");
5248 }
5249
5250 void os::PlatformEvent::unpark() {
5251 guarantee(_ParkHandle != NULL, "Invariant");
5252
5253 // Transitions for _Event:
5254 // 0 => 1 : just return
5255 // 1 => 1 : just return
5256 // -1 => either 0 or 1; must signal target thread
5257 // That is, we can safely transition _Event from -1 to either
5258 // 0 or 1.
5259 // See also: "Semaphores in Plan 9" by Mullender & Cox
5260 //
5261 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5262 // that it will take two back-to-back park() calls for the owning
5263 // thread to block. This has the benefit of forcing a spurious return
5264 // from the first park() call after an unpark() call which will help
5265 // shake out uses of park() and unpark() without condition variables.
5266
5267 if (Atomic::xchg(&_Event, 1) >= 0) return;
5268
5269 ::SetEvent(_ParkHandle);
5270 }
5271
5272
5273 // JSR166
5274 // -------------------------------------------------------
5275
5276 // The Windows implementation of Park is very straightforward: Basic
5277 // operations on Win32 Events turn out to have the right semantics to
5278 // use them directly. We opportunistically resuse the event inherited
5279 // from Monitor.
5280
5281 void Parker::park(bool isAbsolute, jlong time) {
5282 guarantee(_ParkEvent != NULL, "invariant");
5283 // First, demultiplex/decode time arguments
5284 if (time < 0) { // don't wait
5285 return;
5286 } else if (time == 0 && !isAbsolute) {
5287 time = INFINITE;
5288 } else if (isAbsolute) {
5289 time -= os::javaTimeMillis(); // convert to relative time
5290 if (time <= 0) { // already elapsed
5291 return;
5292 }
5293 } else { // relative
5294 time /= 1000000; // Must coarsen from nanos to millis
5295 if (time == 0) { // Wait for the minimal time unit if zero
5296 time = 1;
5297 }
5298 }
5299
5300 JavaThread* thread = JavaThread::current();
5301
5302 // Don't wait if interrupted or already triggered
5303 if (thread->is_interrupted(false) ||
5304 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5305 ResetEvent(_ParkEvent);
5306 return;
5307 } else {
5308 ThreadBlockInVM tbivm(thread);
5309 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5310 thread->set_suspend_equivalent();
5311
5312 WaitForSingleObject(_ParkEvent, time);
5313 ResetEvent(_ParkEvent);
5314
5315 // If externally suspended while waiting, re-suspend
5316 if (thread->handle_special_suspend_equivalent_condition()) {
5317 thread->java_suspend_self();
5318 }
5319 }
5320 }
5321
5322 void Parker::unpark() {
5323 guarantee(_ParkEvent != NULL, "invariant");
5324 SetEvent(_ParkEvent);
5325 }
5326
5327 // Platform Monitor implementation
5328
5329 // Must already be locked
5330 int os::PlatformMonitor::wait(jlong millis) {
5331 assert(millis >= 0, "negative timeout");
5332 int ret = OS_TIMEOUT;
5333 int status = SleepConditionVariableCS(&_cond, &_mutex,
5334 millis == 0 ? INFINITE : millis);
5335 if (status != 0) {
5336 ret = OS_OK;
5337 }
5338 #ifndef PRODUCT
5339 else {
5340 DWORD err = GetLastError();
5341 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5342 }
5343 #endif
5344 return ret;
5345 }
5346
5347 // Run the specified command in a separate process. Return its exit value,
5348 // or -1 on failure (e.g. can't create a new process).
5349 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5350 STARTUPINFO si;
5351 PROCESS_INFORMATION pi;
5352 DWORD exit_code;
5353
5354 char * cmd_string;
5355 const char * cmd_prefix = "cmd /C ";
5356 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5357 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5358 if (cmd_string == NULL) {
5359 return -1;
5360 }
5361 cmd_string[0] = '\0';
5362 strcat(cmd_string, cmd_prefix);
5363 strcat(cmd_string, cmd);
5364
5365 // now replace all '\n' with '&'
5366 char * substring = cmd_string;
5367 while ((substring = strchr(substring, '\n')) != NULL) {
5368 substring[0] = '&';
5369 substring++;
5370 }
5371 memset(&si, 0, sizeof(si));
5372 si.cb = sizeof(si);
5373 memset(&pi, 0, sizeof(pi));
5374 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5375 cmd_string, // command line
5376 NULL, // process security attribute
5377 NULL, // thread security attribute
5378 TRUE, // inherits system handles
5379 0, // no creation flags
5380 NULL, // use parent's environment block
5381 NULL, // use parent's starting directory
5382 &si, // (in) startup information
5383 &pi); // (out) process information
5384
5385 if (rslt) {
5386 // Wait until child process exits.
5387 WaitForSingleObject(pi.hProcess, INFINITE);
5388
5389 GetExitCodeProcess(pi.hProcess, &exit_code);
5390
5391 // Close process and thread handles.
5392 CloseHandle(pi.hProcess);
5393 CloseHandle(pi.hThread);
5394 } else {
5395 exit_code = -1;
5396 }
5397
5398 FREE_C_HEAP_ARRAY(char, cmd_string);
5399 return (int)exit_code;
5400 }
5401
5402 bool os::find(address addr, outputStream* st) {
5403 int offset = -1;
5404 bool result = false;
5405 char buf[256];
5406 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5407 st->print(PTR_FORMAT " ", addr);
5408 if (strlen(buf) < sizeof(buf) - 1) {
5409 char* p = strrchr(buf, '\\');
5410 if (p) {
5411 st->print("%s", p + 1);
5412 } else {
5413 st->print("%s", buf);
5414 }
5415 } else {
5416 // The library name is probably truncated. Let's omit the library name.
5417 // See also JDK-8147512.
5418 }
5419 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5420 st->print("::%s + 0x%x", buf, offset);
5421 }
5422 st->cr();
5423 result = true;
5424 }
5425 return result;
5426 }
5427
5428 static jint initSock() {
5429 WSADATA wsadata;
5430
5431 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5432 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5433 ::GetLastError());
5434 return JNI_ERR;
5435 }
5436 return JNI_OK;
5437 }
5438
5439 struct hostent* os::get_host_by_name(char* name) {
5440 return (struct hostent*)gethostbyname(name);
5441 }
5442
5443 int os::socket_close(int fd) {
5444 return ::closesocket(fd);
5445 }
5446
5447 int os::socket(int domain, int type, int protocol) {
5448 return ::socket(domain, type, protocol);
5449 }
5450
5451 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5452 return ::connect(fd, him, len);
5453 }
5454
5455 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5456 return ::recv(fd, buf, (int)nBytes, flags);
5457 }
5458
5459 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5460 return ::send(fd, buf, (int)nBytes, flags);
5461 }
5462
5463 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5464 return ::send(fd, buf, (int)nBytes, flags);
5465 }
5466
5467 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5468 #if defined(IA32)
5469 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5470 #elif defined (AMD64)
5471 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5472 #endif
5473
5474 // returns true if thread could be suspended,
5475 // false otherwise
5476 static bool do_suspend(HANDLE* h) {
5477 if (h != NULL) {
5478 if (SuspendThread(*h) != ~0) {
5479 return true;
5480 }
5481 }
5482 return false;
5483 }
5484
5485 // resume the thread
5486 // calling resume on an active thread is a no-op
5487 static void do_resume(HANDLE* h) {
5488 if (h != NULL) {
5489 ResumeThread(*h);
5490 }
5491 }
5492
5493 // retrieve a suspend/resume context capable handle
5494 // from the tid. Caller validates handle return value.
5495 void get_thread_handle_for_extended_context(HANDLE* h,
5496 OSThread::thread_id_t tid) {
5497 if (h != NULL) {
5498 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5499 }
5500 }
5501
5502 // Thread sampling implementation
5503 //
5504 void os::SuspendedThreadTask::internal_do_task() {
5505 CONTEXT ctxt;
5506 HANDLE h = NULL;
5507
5508 // get context capable handle for thread
5509 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5510
5511 // sanity
5512 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5513 return;
5514 }
5515
5516 // suspend the thread
5517 if (do_suspend(&h)) {
5518 ctxt.ContextFlags = sampling_context_flags;
5519 // get thread context
5520 GetThreadContext(h, &ctxt);
5521 SuspendedThreadTaskContext context(_thread, &ctxt);
5522 // pass context to Thread Sampling impl
5523 do_task(context);
5524 // resume thread
5525 do_resume(&h);
5526 }
5527
5528 // close handle
5529 CloseHandle(h);
5530 }
5531
5532 bool os::start_debugging(char *buf, int buflen) {
5533 int len = (int)strlen(buf);
5534 char *p = &buf[len];
5535
5536 jio_snprintf(p, buflen-len,
5537 "\n\n"
5538 "Do you want to debug the problem?\n\n"
5539 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5540 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5541 "Otherwise, select 'No' to abort...",
5542 os::current_process_id(), os::current_thread_id());
5543
5544 bool yes = os::message_box("Unexpected Error", buf);
5545
5546 if (yes) {
5547 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5548 // exception. If VM is running inside a debugger, the debugger will
5549 // catch the exception. Otherwise, the breakpoint exception will reach
5550 // the default windows exception handler, which can spawn a debugger and
5551 // automatically attach to the dying VM.
5552 os::breakpoint();
5553 yes = false;
5554 }
5555 return yes;
5556 }
5557
5558 void* os::get_default_process_handle() {
5559 return (void*)GetModuleHandle(NULL);
5560 }
5561
5562 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5563 // which is used to find statically linked in agents.
5564 // Additionally for windows, takes into account __stdcall names.
5565 // Parameters:
5566 // sym_name: Symbol in library we are looking for
5567 // lib_name: Name of library to look in, NULL for shared libs.
5568 // is_absolute_path == true if lib_name is absolute path to agent
5569 // such as "C:/a/b/L.dll"
5570 // == false if only the base name of the library is passed in
5571 // such as "L"
5572 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5573 bool is_absolute_path) {
5574 char *agent_entry_name;
5575 size_t len;
5576 size_t name_len;
5577 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5578 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5579 const char *start;
5580
5581 if (lib_name != NULL) {
5582 len = name_len = strlen(lib_name);
5583 if (is_absolute_path) {
5584 // Need to strip path, prefix and suffix
5585 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5586 lib_name = ++start;
5587 } else {
5588 // Need to check for drive prefix
5589 if ((start = strchr(lib_name, ':')) != NULL) {
5590 lib_name = ++start;
5591 }
5592 }
5593 if (len <= (prefix_len + suffix_len)) {
5594 return NULL;
5595 }
5596 lib_name += prefix_len;
5597 name_len = strlen(lib_name) - suffix_len;
5598 }
5599 }
5600 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5601 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5602 if (agent_entry_name == NULL) {
5603 return NULL;
5604 }
5605 if (lib_name != NULL) {
5606 const char *p = strrchr(sym_name, '@');
5607 if (p != NULL && p != sym_name) {
5608 // sym_name == _Agent_OnLoad@XX
5609 strncpy(agent_entry_name, sym_name, (p - sym_name));
5610 agent_entry_name[(p-sym_name)] = '\0';
5611 // agent_entry_name == _Agent_OnLoad
5612 strcat(agent_entry_name, "_");
5613 strncat(agent_entry_name, lib_name, name_len);
5614 strcat(agent_entry_name, p);
5615 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5616 } else {
5617 strcpy(agent_entry_name, sym_name);
5618 strcat(agent_entry_name, "_");
5619 strncat(agent_entry_name, lib_name, name_len);
5620 }
5621 } else {
5622 strcpy(agent_entry_name, sym_name);
5623 }
5624 return agent_entry_name;
5625 }
5626
5627 #ifndef PRODUCT
5628
5629 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5630 // contiguous memory block at a particular address.
5631 // The test first tries to find a good approximate address to allocate at by using the same
5632 // method to allocate some memory at any address. The test then tries to allocate memory in
5633 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5634 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5635 // the previously allocated memory is available for allocation. The only actual failure
5636 // that is reported is when the test tries to allocate at a particular location but gets a
5637 // different valid one. A NULL return value at this point is not considered an error but may
5638 // be legitimate.
5639 void TestReserveMemorySpecial_test() {
5640 if (!UseLargePages) {
5641 return;
5642 }
5643 // save current value of globals
5644 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5645 bool old_use_numa_interleaving = UseNUMAInterleaving;
5646
5647 // set globals to make sure we hit the correct code path
5648 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5649
5650 // do an allocation at an address selected by the OS to get a good one.
5651 const size_t large_allocation_size = os::large_page_size() * 4;
5652 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5653 if (result == NULL) {
5654 } else {
5655 os::release_memory_special(result, large_allocation_size);
5656
5657 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5658 // we managed to get it once.
5659 const size_t expected_allocation_size = os::large_page_size();
5660 char* expected_location = result + os::large_page_size();
5661 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5662 if (actual_location == NULL) {
5663 } else {
5664 // release memory
5665 os::release_memory_special(actual_location, expected_allocation_size);
5666 // only now check, after releasing any memory to avoid any leaks.
5667 assert(actual_location == expected_location,
5668 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5669 expected_location, expected_allocation_size, actual_location);
5670 }
5671 }
5672
5673 // restore globals
5674 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5675 UseNUMAInterleaving = old_use_numa_interleaving;
5676 }
5677 #endif // PRODUCT
5678
5679 /*
5680 All the defined signal names for Windows.
5681
5682 NOTE that not all of these names are accepted by FindSignal!
5683
5684 For various reasons some of these may be rejected at runtime.
5685
5686 Here are the names currently accepted by a user of sun.misc.Signal with
5687 1.4.1 (ignoring potential interaction with use of chaining, etc):
5688
5689 (LIST TBD)
5690
5691 */
5692 int os::get_signal_number(const char* name) {
5693 static const struct {
5694 const char* name;
5695 int number;
5696 } siglabels [] =
5697 // derived from version 6.0 VC98/include/signal.h
5698 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5699 "FPE", SIGFPE, // floating point exception
5700 "SEGV", SIGSEGV, // segment violation
5701 "INT", SIGINT, // interrupt
5702 "TERM", SIGTERM, // software term signal from kill
5703 "BREAK", SIGBREAK, // Ctrl-Break sequence
5704 "ILL", SIGILL}; // illegal instruction
5705 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5706 if (strcmp(name, siglabels[i].name) == 0) {
5707 return siglabels[i].number;
5708 }
5709 }
5710 return -1;
5711 }
5712
5713 // Fast current thread access
5714
5715 int os::win32::_thread_ptr_offset = 0;
5716
5717 static void call_wrapper_dummy() {}
5718
5719 // We need to call the os_exception_wrapper once so that it sets
5720 // up the offset from FS of the thread pointer.
5721 void os::win32::initialize_thread_ptr_offset() {
5722 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5723 NULL, methodHandle(), NULL, NULL);
5724 }
5725
5726 bool os::supports_map_sync() {
5727 return false;
5728 }