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/codeCache.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/nativeInst.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "compiler/disassembler.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/filemap.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "os_share_windows.hpp"
46 #include "os_windows.inline.hpp"
47 #include "prims/jniFastGetField.hpp"
48 #include "prims/jvm_misc.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/globals.hpp"
52 #include "runtime/interfaceSupport.inline.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/mutexLocker.hpp"
56 #include "runtime/objectMonitor.hpp"
57 #include "runtime/orderAccess.hpp"
58 #include "runtime/osThread.hpp"
59 #include "runtime/perfMemory.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/statSampler.hpp"
63 #include "runtime/stubRoutines.hpp"
64 #include "runtime/thread.inline.hpp"
65 #include "runtime/threadCritical.hpp"
66 #include "runtime/timer.hpp"
67 #include "runtime/vm_version.hpp"
68 #include "services/attachListener.hpp"
69 #include "services/memTracker.hpp"
70 #include "services/runtimeService.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/decoder.hpp"
73 #include "utilities/defaultStream.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/vmError.hpp"
77 #include "symbolengine.hpp"
78 #include "windbghelp.hpp"
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84 #include <windows.h>
85 #include <sys/types.h>
86 #include <sys/stat.h>
87 #include <sys/timeb.h>
88 #include <objidl.h>
89 #include <shlobj.h>
90
91 #include <malloc.h>
92 #include <signal.h>
93 #include <direct.h>
94 #include <errno.h>
95 #include <fcntl.h>
96 #include <io.h>
97 #include <process.h> // For _beginthreadex(), _endthreadex()
98 #include <imagehlp.h> // For os::dll_address_to_function_name
99 // for enumerating dll libraries
100 #include <vdmdbg.h>
101 #include <psapi.h>
102 #include <mmsystem.h>
103 #include <winsock2.h>
104
105 // for timer info max values which include all bits
106 #define ALL_64_BITS CONST64(-1)
107
108 // For DLL loading/load error detection
109 // Values of PE COFF
110 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
111 #define IMAGE_FILE_SIGNATURE_LENGTH 4
112
113 static HANDLE main_process;
114 static HANDLE main_thread;
115 static int main_thread_id;
116
117 static FILETIME process_creation_time;
118 static FILETIME process_exit_time;
119 static FILETIME process_user_time;
120 static FILETIME process_kernel_time;
121
122 #if defined(_M_ARM64)
123 #define __CPU__ aarch64
124 #elif defined(_M_AMD64)
125 #define __CPU__ amd64
126 #else
127 #define __CPU__ i486
128 #endif
129
130 #if defined(USE_VECTORED_EXCEPTION_HANDLING)
131 PVOID topLevelVectoredExceptionHandler = NULL;
132 LPTOP_LEVEL_EXCEPTION_FILTER previousUnhandledExceptionFilter = NULL;
133 #elif INCLUDE_AOT
134 PVOID topLevelVectoredExceptionHandler = NULL;
135 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
136 #endif
137
138 // save DLL module handle, used by GetModuleFileName
139
140 HINSTANCE vm_lib_handle;
141
142 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
143 switch (reason) {
144 case DLL_PROCESS_ATTACH:
145 vm_lib_handle = hinst;
146 if (ForceTimeHighResolution) {
147 timeBeginPeriod(1L);
148 }
149 WindowsDbgHelp::pre_initialize();
150 SymbolEngine::pre_initialize();
151 break;
152 case DLL_PROCESS_DETACH:
153 if (ForceTimeHighResolution) {
154 timeEndPeriod(1L);
155 }
156 #if defined(USE_VECTORED_EXCEPTION_HANDLING) || INCLUDE_AOT
157 if (topLevelVectoredExceptionHandler != NULL) {
158 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
159 topLevelVectoredExceptionHandler = NULL;
160 }
161 #endif
162 break;
163 default:
164 break;
165 }
166 return true;
167 }
168
169 static inline double fileTimeAsDouble(FILETIME* time) {
170 const double high = (double) ((unsigned int) ~0);
171 const double split = 10000000.0;
172 double result = (time->dwLowDateTime / split) +
173 time->dwHighDateTime * (high/split);
174 return result;
175 }
176
177 // Implementation of os
178
179 bool os::unsetenv(const char* name) {
180 assert(name != NULL, "Null pointer");
181 return (SetEnvironmentVariable(name, NULL) == TRUE);
182 }
183
184 // No setuid programs under Windows.
185 bool os::have_special_privileges() {
186 return false;
187 }
188
189
190 // This method is a periodic task to check for misbehaving JNI applications
191 // under CheckJNI, we can add any periodic checks here.
192 // For Windows at the moment does nothing
193 void os::run_periodic_checks() {
194 return;
195 }
196
197 // previous UnhandledExceptionFilter, if there is one
198 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
199
200 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
201
202 void os::init_system_properties_values() {
203 // sysclasspath, java_home, dll_dir
204 {
205 char *home_path;
206 char *dll_path;
207 char *pslash;
208 const char *bin = "\\bin";
209 char home_dir[MAX_PATH + 1];
210 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
211
212 if (alt_home_dir != NULL) {
213 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
214 home_dir[MAX_PATH] = '\0';
215 } else {
216 os::jvm_path(home_dir, sizeof(home_dir));
217 // Found the full path to jvm.dll.
218 // Now cut the path to <java_home>/jre if we can.
219 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
220 pslash = strrchr(home_dir, '\\');
221 if (pslash != NULL) {
222 *pslash = '\0'; // get rid of \{client|server}
223 pslash = strrchr(home_dir, '\\');
224 if (pslash != NULL) {
225 *pslash = '\0'; // get rid of \bin
226 }
227 }
228 }
229
230 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
231 strcpy(home_path, home_dir);
232 Arguments::set_java_home(home_path);
233 FREE_C_HEAP_ARRAY(char, home_path);
234
235 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
236 mtInternal);
237 strcpy(dll_path, home_dir);
238 strcat(dll_path, bin);
239 Arguments::set_dll_dir(dll_path);
240 FREE_C_HEAP_ARRAY(char, dll_path);
241
242 if (!set_boot_path('\\', ';')) {
243 vm_exit_during_initialization("Failed setting boot class path.", NULL);
244 }
245 }
246
247 // library_path
248 #define EXT_DIR "\\lib\\ext"
249 #define BIN_DIR "\\bin"
250 #define PACKAGE_DIR "\\Sun\\Java"
251 {
252 // Win32 library search order (See the documentation for LoadLibrary):
253 //
254 // 1. The directory from which application is loaded.
255 // 2. The system wide Java Extensions directory (Java only)
256 // 3. System directory (GetSystemDirectory)
257 // 4. Windows directory (GetWindowsDirectory)
258 // 5. The PATH environment variable
259 // 6. The current directory
260
261 char *library_path;
262 char tmp[MAX_PATH];
263 char *path_str = ::getenv("PATH");
264
265 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
266 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
267
268 library_path[0] = '\0';
269
270 GetModuleFileName(NULL, tmp, sizeof(tmp));
271 *(strrchr(tmp, '\\')) = '\0';
272 strcat(library_path, tmp);
273
274 GetWindowsDirectory(tmp, sizeof(tmp));
275 strcat(library_path, ";");
276 strcat(library_path, tmp);
277 strcat(library_path, PACKAGE_DIR BIN_DIR);
278
279 GetSystemDirectory(tmp, sizeof(tmp));
280 strcat(library_path, ";");
281 strcat(library_path, tmp);
282
283 GetWindowsDirectory(tmp, sizeof(tmp));
284 strcat(library_path, ";");
285 strcat(library_path, tmp);
286
287 if (path_str) {
288 strcat(library_path, ";");
289 strcat(library_path, path_str);
290 }
291
292 strcat(library_path, ";.");
293
294 Arguments::set_library_path(library_path);
295 FREE_C_HEAP_ARRAY(char, library_path);
296 }
297
298 // Default extensions directory
299 {
300 char path[MAX_PATH];
301 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
302 GetWindowsDirectory(path, MAX_PATH);
303 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
304 path, PACKAGE_DIR, EXT_DIR);
305 Arguments::set_ext_dirs(buf);
306 }
307 #undef EXT_DIR
308 #undef BIN_DIR
309 #undef PACKAGE_DIR
310
311 #ifndef _WIN64
312 // set our UnhandledExceptionFilter and save any previous one
313 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
314 #endif
315
316 // Done
317 return;
318 }
319
320 void os::breakpoint() {
321 DebugBreak();
322 }
323
324 // Invoked from the BREAKPOINT Macro
325 extern "C" void breakpoint() {
326 os::breakpoint();
327 }
328
329 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
330 // So far, this method is only used by Native Memory Tracking, which is
331 // only supported on Windows XP or later.
332 //
333 int os::get_native_stack(address* stack, int frames, int toSkip) {
334 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
335 for (int index = captured; index < frames; index ++) {
336 stack[index] = NULL;
337 }
338 return captured;
339 }
340
341
342 // os::current_stack_base()
343 //
344 // Returns the base of the stack, which is the stack's
345 // starting address. This function must be called
346 // while running on the stack of the thread being queried.
347
348 address os::current_stack_base() {
349 MEMORY_BASIC_INFORMATION minfo;
350 address stack_bottom;
351 size_t stack_size;
352
353 VirtualQuery(&minfo, &minfo, sizeof(minfo));
354 stack_bottom = (address)minfo.AllocationBase;
355 stack_size = minfo.RegionSize;
356
357 // Add up the sizes of all the regions with the same
358 // AllocationBase.
359 while (1) {
360 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
361 if (stack_bottom == (address)minfo.AllocationBase) {
362 stack_size += minfo.RegionSize;
363 } else {
364 break;
365 }
366 }
367 return stack_bottom + stack_size;
368 }
369
370 size_t os::current_stack_size() {
371 size_t sz;
372 MEMORY_BASIC_INFORMATION minfo;
373 VirtualQuery(&minfo, &minfo, sizeof(minfo));
374 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
375 return sz;
376 }
377
378 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
379 MEMORY_BASIC_INFORMATION minfo;
380 committed_start = NULL;
381 committed_size = 0;
382 address top = start + size;
383 const address start_addr = start;
384 while (start < top) {
385 VirtualQuery(start, &minfo, sizeof(minfo));
386 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
387 if (committed_start != NULL) {
388 break;
389 }
390 } else { // committed
391 if (committed_start == NULL) {
392 committed_start = start;
393 }
394 size_t offset = start - (address)minfo.BaseAddress;
395 committed_size += minfo.RegionSize - offset;
396 }
397 start = (address)minfo.BaseAddress + minfo.RegionSize;
398 }
399
400 if (committed_start == NULL) {
401 assert(committed_size == 0, "Sanity");
402 return false;
403 } else {
404 assert(committed_start >= start_addr && committed_start < top, "Out of range");
405 // current region may go beyond the limit, trim to the limit
406 committed_size = MIN2(committed_size, size_t(top - committed_start));
407 return true;
408 }
409 }
410
411 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
412 const struct tm* time_struct_ptr = localtime(clock);
413 if (time_struct_ptr != NULL) {
414 *res = *time_struct_ptr;
415 return res;
416 }
417 return NULL;
418 }
419
420 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
421 const struct tm* time_struct_ptr = gmtime(clock);
422 if (time_struct_ptr != NULL) {
423 *res = *time_struct_ptr;
424 return res;
425 }
426 return NULL;
427 }
428
429 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
430
431 // Thread start routine for all newly created threads
432 static unsigned __stdcall thread_native_entry(Thread* thread) {
433
434 thread->record_stack_base_and_size();
435
436 // Try to randomize the cache line index of hot stack frames.
437 // This helps when threads of the same stack traces evict each other's
438 // cache lines. The threads can be either from the same JVM instance, or
439 // from different JVM instances. The benefit is especially true for
440 // processors with hyperthreading technology.
441 static int counter = 0;
442 int pid = os::current_process_id();
443 _alloca(((pid ^ counter++) & 7) * 128);
444
445 thread->initialize_thread_current();
446
447 OSThread* osthr = thread->osthread();
448 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
449
450 if (UseNUMA) {
451 int lgrp_id = os::numa_get_group_id();
452 if (lgrp_id != -1) {
453 thread->set_lgrp_id(lgrp_id);
454 }
455 }
456
457 // Diagnostic code to investigate JDK-6573254
458 int res = 30115; // non-java thread
459 if (thread->is_Java_thread()) {
460 res = 20115; // java thread
461 }
462
463 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
464
465 #ifdef USE_VECTORED_EXCEPTION_HANDLING
466 // Any exception is caught by the Vectored Exception Handler, so VM can
467 // generate error dump when an exception occurred in non-Java thread
468 // (e.g. VM thread).
469 thread->call_run();
470 #else
471 // Install a win32 structured exception handler around every thread created
472 // by VM, so VM can generate error dump when an exception occurred in non-
473 // Java thread (e.g. VM thread).
474 __try {
475 thread->call_run();
476 } __except(topLevelExceptionFilter(
477 (_EXCEPTION_POINTERS*)_exception_info())) {
478 // Nothing to do.
479 }
480 #endif
481
482 // Note: at this point the thread object may already have deleted itself.
483 // Do not dereference it from here on out.
484
485 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
486
487 // One less thread is executing
488 // When the VMThread gets here, the main thread may have already exited
489 // which frees the CodeHeap containing the Atomic::add code
490 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
491 Atomic::dec(&os::win32::_os_thread_count);
492 }
493
494 // Thread must not return from exit_process_or_thread(), but if it does,
495 // let it proceed to exit normally
496 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
497 }
498
499 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
500 int thread_id) {
501 // Allocate the OSThread object
502 OSThread* osthread = new OSThread(NULL, NULL);
503 if (osthread == NULL) return NULL;
504
505 // Initialize the JDK library's interrupt event.
506 // This should really be done when OSThread is constructed,
507 // but there is no way for a constructor to report failure to
508 // allocate the event.
509 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
510 if (interrupt_event == NULL) {
511 delete osthread;
512 return NULL;
513 }
514 osthread->set_interrupt_event(interrupt_event);
515
516 // Store info on the Win32 thread into the OSThread
517 osthread->set_thread_handle(thread_handle);
518 osthread->set_thread_id(thread_id);
519
520 if (UseNUMA) {
521 int lgrp_id = os::numa_get_group_id();
522 if (lgrp_id != -1) {
523 thread->set_lgrp_id(lgrp_id);
524 }
525 }
526
527 // Initial thread state is INITIALIZED, not SUSPENDED
528 osthread->set_state(INITIALIZED);
529
530 return osthread;
531 }
532
533
534 bool os::create_attached_thread(JavaThread* thread) {
535 #ifdef ASSERT
536 thread->verify_not_published();
537 #endif
538 HANDLE thread_h;
539 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
540 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
541 fatal("DuplicateHandle failed\n");
542 }
543 OSThread* osthread = create_os_thread(thread, thread_h,
544 (int)current_thread_id());
545 if (osthread == NULL) {
546 return false;
547 }
548
549 // Initial thread state is RUNNABLE
550 osthread->set_state(RUNNABLE);
551
552 thread->set_osthread(osthread);
553
554 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
555 os::current_thread_id());
556
557 return true;
558 }
559
560 bool os::create_main_thread(JavaThread* thread) {
561 #ifdef ASSERT
562 thread->verify_not_published();
563 #endif
564 if (_starting_thread == NULL) {
565 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
566 if (_starting_thread == NULL) {
567 return false;
568 }
569 }
570
571 // The primordial thread is runnable from the start)
572 _starting_thread->set_state(RUNNABLE);
573
574 thread->set_osthread(_starting_thread);
575 return true;
576 }
577
578 // Helper function to trace _beginthreadex attributes,
579 // similar to os::Posix::describe_pthread_attr()
580 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
581 size_t stacksize, unsigned initflag) {
582 stringStream ss(buf, buflen);
583 if (stacksize == 0) {
584 ss.print("stacksize: default, ");
585 } else {
586 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
587 }
588 ss.print("flags: ");
589 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
590 #define ALL(X) \
591 X(CREATE_SUSPENDED) \
592 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
593 ALL(PRINT_FLAG)
594 #undef ALL
595 #undef PRINT_FLAG
596 return buf;
597 }
598
599 // Allocate and initialize a new OSThread
600 bool os::create_thread(Thread* thread, ThreadType thr_type,
601 size_t stack_size) {
602 unsigned thread_id;
603
604 // Allocate the OSThread object
605 OSThread* osthread = new OSThread(NULL, NULL);
606 if (osthread == NULL) {
607 return false;
608 }
609
610 // Initialize the JDK library's interrupt event.
611 // This should really be done when OSThread is constructed,
612 // but there is no way for a constructor to report failure to
613 // allocate the event.
614 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
615 if (interrupt_event == NULL) {
616 delete osthread;
617 return false;
618 }
619 osthread->set_interrupt_event(interrupt_event);
620 // We don't call set_interrupted(false) as it will trip the assert in there
621 // as we are not operating on the current thread. We don't need to call it
622 // because the initial state is already correct.
623
624 thread->set_osthread(osthread);
625
626 if (stack_size == 0) {
627 switch (thr_type) {
628 case os::java_thread:
629 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
630 if (JavaThread::stack_size_at_create() > 0) {
631 stack_size = JavaThread::stack_size_at_create();
632 }
633 break;
634 case os::compiler_thread:
635 if (CompilerThreadStackSize > 0) {
636 stack_size = (size_t)(CompilerThreadStackSize * K);
637 break;
638 } // else fall through:
639 // use VMThreadStackSize if CompilerThreadStackSize is not defined
640 case os::vm_thread:
641 case os::pgc_thread:
642 case os::cgc_thread:
643 case os::watcher_thread:
644 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
645 break;
646 }
647 }
648
649 // Create the Win32 thread
650 //
651 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
652 // does not specify stack size. Instead, it specifies the size of
653 // initially committed space. The stack size is determined by
654 // PE header in the executable. If the committed "stack_size" is larger
655 // than default value in the PE header, the stack is rounded up to the
656 // nearest multiple of 1MB. For example if the launcher has default
657 // stack size of 320k, specifying any size less than 320k does not
658 // affect the actual stack size at all, it only affects the initial
659 // commitment. On the other hand, specifying 'stack_size' larger than
660 // default value may cause significant increase in memory usage, because
661 // not only the stack space will be rounded up to MB, but also the
662 // entire space is committed upfront.
663 //
664 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
665 // for CreateThread() that can treat 'stack_size' as stack size. However we
666 // are not supposed to call CreateThread() directly according to MSDN
667 // document because JVM uses C runtime library. The good news is that the
668 // flag appears to work with _beginthredex() as well.
669
670 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
671 HANDLE thread_handle =
672 (HANDLE)_beginthreadex(NULL,
673 (unsigned)stack_size,
674 (unsigned (__stdcall *)(void*)) thread_native_entry,
675 thread,
676 initflag,
677 &thread_id);
678
679 char buf[64];
680 if (thread_handle != NULL) {
681 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
682 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
683 } else {
684 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
685 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
686 // Log some OS information which might explain why creating the thread failed.
687 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
688 LogStream st(Log(os, thread)::info());
689 os::print_memory_info(&st);
690 }
691
692 if (thread_handle == NULL) {
693 // Need to clean up stuff we've allocated so far
694 thread->set_osthread(NULL);
695 delete osthread;
696 return false;
697 }
698
699 Atomic::inc(&os::win32::_os_thread_count);
700
701 // Store info on the Win32 thread into the OSThread
702 osthread->set_thread_handle(thread_handle);
703 osthread->set_thread_id(thread_id);
704
705 // Initial thread state is INITIALIZED, not SUSPENDED
706 osthread->set_state(INITIALIZED);
707
708 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
709 return true;
710 }
711
712
713 // Free Win32 resources related to the OSThread
714 void os::free_thread(OSThread* osthread) {
715 assert(osthread != NULL, "osthread not set");
716
717 // We are told to free resources of the argument thread,
718 // but we can only really operate on the current thread.
719 assert(Thread::current()->osthread() == osthread,
720 "os::free_thread but not current thread");
721
722 CloseHandle(osthread->thread_handle());
723 delete osthread;
724 }
725
726 static jlong first_filetime;
727 static jlong initial_performance_count;
728 static jlong performance_frequency;
729
730
731 jlong as_long(LARGE_INTEGER x) {
732 jlong result = 0; // initialization to avoid warning
733 set_high(&result, x.HighPart);
734 set_low(&result, x.LowPart);
735 return result;
736 }
737
738
739 jlong os::elapsed_counter() {
740 LARGE_INTEGER count;
741 QueryPerformanceCounter(&count);
742 return as_long(count) - initial_performance_count;
743 }
744
745
746 jlong os::elapsed_frequency() {
747 return performance_frequency;
748 }
749
750
751 julong os::available_memory() {
752 return win32::available_memory();
753 }
754
755 julong os::win32::available_memory() {
756 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
757 // value if total memory is larger than 4GB
758 MEMORYSTATUSEX ms;
759 ms.dwLength = sizeof(ms);
760 GlobalMemoryStatusEx(&ms);
761
762 return (julong)ms.ullAvailPhys;
763 }
764
765 julong os::physical_memory() {
766 return win32::physical_memory();
767 }
768
769 bool os::has_allocatable_memory_limit(julong* limit) {
770 MEMORYSTATUSEX ms;
771 ms.dwLength = sizeof(ms);
772 GlobalMemoryStatusEx(&ms);
773 #ifdef _LP64
774 *limit = (julong)ms.ullAvailVirtual;
775 return true;
776 #else
777 // Limit to 1400m because of the 2gb address space wall
778 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
779 return true;
780 #endif
781 }
782
783 int os::active_processor_count() {
784 // User has overridden the number of active processors
785 if (ActiveProcessorCount > 0) {
786 log_trace(os)("active_processor_count: "
787 "active processor count set by user : %d",
788 ActiveProcessorCount);
789 return ActiveProcessorCount;
790 }
791
792 DWORD_PTR lpProcessAffinityMask = 0;
793 DWORD_PTR lpSystemAffinityMask = 0;
794 int proc_count = processor_count();
795 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
796 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
797 // Nof active processors is number of bits in process affinity mask
798 int bitcount = 0;
799 while (lpProcessAffinityMask != 0) {
800 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
801 bitcount++;
802 }
803 return bitcount;
804 } else {
805 return proc_count;
806 }
807 }
808
809 uint os::processor_id() {
810 return (uint)GetCurrentProcessorNumber();
811 }
812
813 void os::set_native_thread_name(const char *name) {
814
815 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
816 //
817 // Note that unfortunately this only works if the process
818 // is already attached to a debugger; debugger must observe
819 // the exception below to show the correct name.
820
821 // If there is no debugger attached skip raising the exception
822 if (!IsDebuggerPresent()) {
823 return;
824 }
825
826 const DWORD MS_VC_EXCEPTION = 0x406D1388;
827 struct {
828 DWORD dwType; // must be 0x1000
829 LPCSTR szName; // pointer to name (in user addr space)
830 DWORD dwThreadID; // thread ID (-1=caller thread)
831 DWORD dwFlags; // reserved for future use, must be zero
832 } info;
833
834 info.dwType = 0x1000;
835 info.szName = name;
836 info.dwThreadID = -1;
837 info.dwFlags = 0;
838
839 __try {
840 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
841 } __except(EXCEPTION_EXECUTE_HANDLER) {}
842 }
843
844 bool os::bind_to_processor(uint processor_id) {
845 // Not yet implemented.
846 return false;
847 }
848
849 void os::win32::initialize_performance_counter() {
850 LARGE_INTEGER count;
851 QueryPerformanceFrequency(&count);
852 performance_frequency = as_long(count);
853 QueryPerformanceCounter(&count);
854 initial_performance_count = as_long(count);
855 }
856
857
858 double os::elapsedTime() {
859 return (double) elapsed_counter() / (double) elapsed_frequency();
860 }
861
862
863 // Windows format:
864 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
865 // Java format:
866 // Java standards require the number of milliseconds since 1/1/1970
867
868 // Constant offset - calculated using offset()
869 static jlong _offset = 116444736000000000;
870 // Fake time counter for reproducible results when debugging
871 static jlong fake_time = 0;
872
873 #ifdef ASSERT
874 // Just to be safe, recalculate the offset in debug mode
875 static jlong _calculated_offset = 0;
876 static int _has_calculated_offset = 0;
877
878 jlong offset() {
879 if (_has_calculated_offset) return _calculated_offset;
880 SYSTEMTIME java_origin;
881 java_origin.wYear = 1970;
882 java_origin.wMonth = 1;
883 java_origin.wDayOfWeek = 0; // ignored
884 java_origin.wDay = 1;
885 java_origin.wHour = 0;
886 java_origin.wMinute = 0;
887 java_origin.wSecond = 0;
888 java_origin.wMilliseconds = 0;
889 FILETIME jot;
890 if (!SystemTimeToFileTime(&java_origin, &jot)) {
891 fatal("Error = %d\nWindows error", GetLastError());
892 }
893 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
894 _has_calculated_offset = 1;
895 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
896 return _calculated_offset;
897 }
898 #else
899 jlong offset() {
900 return _offset;
901 }
902 #endif
903
904 jlong windows_to_java_time(FILETIME wt) {
905 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
906 return (a - offset()) / 10000;
907 }
908
909 // Returns time ticks in (10th of micro seconds)
910 jlong windows_to_time_ticks(FILETIME wt) {
911 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
912 return (a - offset());
913 }
914
915 FILETIME java_to_windows_time(jlong l) {
916 jlong a = (l * 10000) + offset();
917 FILETIME result;
918 result.dwHighDateTime = high(a);
919 result.dwLowDateTime = low(a);
920 return result;
921 }
922
923 bool os::supports_vtime() { return true; }
924
925 double os::elapsedVTime() {
926 FILETIME created;
927 FILETIME exited;
928 FILETIME kernel;
929 FILETIME user;
930 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
931 // the resolution of windows_to_java_time() should be sufficient (ms)
932 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
933 } else {
934 return elapsedTime();
935 }
936 }
937
938 jlong os::javaTimeMillis() {
939 FILETIME wt;
940 GetSystemTimeAsFileTime(&wt);
941 return windows_to_java_time(wt);
942 }
943
944 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
945 FILETIME wt;
946 GetSystemTimeAsFileTime(&wt);
947 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
948 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
949 seconds = secs;
950 nanos = jlong(ticks - (secs*10000000)) * 100;
951 }
952
953 jlong os::javaTimeNanos() {
954 LARGE_INTEGER current_count;
955 QueryPerformanceCounter(¤t_count);
956 double current = as_long(current_count);
957 double freq = performance_frequency;
958 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
959 return time;
960 }
961
962 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
963 jlong freq = performance_frequency;
964 if (freq < NANOSECS_PER_SEC) {
965 // the performance counter is 64 bits and we will
966 // be multiplying it -- so no wrap in 64 bits
967 info_ptr->max_value = ALL_64_BITS;
968 } else if (freq > NANOSECS_PER_SEC) {
969 // use the max value the counter can reach to
970 // determine the max value which could be returned
971 julong max_counter = (julong)ALL_64_BITS;
972 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
973 } else {
974 // the performance counter is 64 bits and we will
975 // be using it directly -- so no wrap in 64 bits
976 info_ptr->max_value = ALL_64_BITS;
977 }
978
979 // using a counter, so no skipping
980 info_ptr->may_skip_backward = false;
981 info_ptr->may_skip_forward = false;
982
983 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
984 }
985
986 char* os::local_time_string(char *buf, size_t buflen) {
987 SYSTEMTIME st;
988 GetLocalTime(&st);
989 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
990 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
991 return buf;
992 }
993
994 bool os::getTimesSecs(double* process_real_time,
995 double* process_user_time,
996 double* process_system_time) {
997 HANDLE h_process = GetCurrentProcess();
998 FILETIME create_time, exit_time, kernel_time, user_time;
999 BOOL result = GetProcessTimes(h_process,
1000 &create_time,
1001 &exit_time,
1002 &kernel_time,
1003 &user_time);
1004 if (result != 0) {
1005 FILETIME wt;
1006 GetSystemTimeAsFileTime(&wt);
1007 jlong rtc_millis = windows_to_java_time(wt);
1008 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
1009 *process_user_time =
1010 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1011 *process_system_time =
1012 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1013 return true;
1014 } else {
1015 return false;
1016 }
1017 }
1018
1019 void os::shutdown() {
1020 // allow PerfMemory to attempt cleanup of any persistent resources
1021 perfMemory_exit();
1022
1023 // flush buffered output, finish log files
1024 ostream_abort();
1025
1026 // Check for abort hook
1027 abort_hook_t abort_hook = Arguments::abort_hook();
1028 if (abort_hook != NULL) {
1029 abort_hook();
1030 }
1031 }
1032
1033
1034 static HANDLE dumpFile = NULL;
1035
1036 // Check if dump file can be created.
1037 void os::check_dump_limit(char* buffer, size_t buffsz) {
1038 bool status = true;
1039 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1040 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1041 status = false;
1042 }
1043
1044 #ifndef ASSERT
1045 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1046 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1047 status = false;
1048 }
1049 #endif
1050
1051 if (status) {
1052 const char* cwd = get_current_directory(NULL, 0);
1053 int pid = current_process_id();
1054 if (cwd != NULL) {
1055 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1056 } else {
1057 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1058 }
1059
1060 if (dumpFile == NULL &&
1061 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1062 == INVALID_HANDLE_VALUE) {
1063 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1064 status = false;
1065 }
1066 }
1067 VMError::record_coredump_status(buffer, status);
1068 }
1069
1070 void os::abort(bool dump_core, void* siginfo, const void* context) {
1071 EXCEPTION_POINTERS ep;
1072 MINIDUMP_EXCEPTION_INFORMATION mei;
1073 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1074
1075 HANDLE hProcess = GetCurrentProcess();
1076 DWORD processId = GetCurrentProcessId();
1077 MINIDUMP_TYPE dumpType;
1078
1079 shutdown();
1080 if (!dump_core || dumpFile == NULL) {
1081 if (dumpFile != NULL) {
1082 CloseHandle(dumpFile);
1083 }
1084 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1085 }
1086
1087 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1088 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1089
1090 if (siginfo != NULL && context != NULL) {
1091 ep.ContextRecord = (PCONTEXT) context;
1092 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1093
1094 mei.ThreadId = GetCurrentThreadId();
1095 mei.ExceptionPointers = &ep;
1096 pmei = &mei;
1097 } else {
1098 pmei = NULL;
1099 }
1100
1101 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1102 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1103 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1104 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1105 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1106 }
1107 CloseHandle(dumpFile);
1108 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1109 }
1110
1111 // Die immediately, no exit hook, no abort hook, no cleanup.
1112 void os::die() {
1113 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1114 }
1115
1116 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1117 // * dirent_md.c 1.15 00/02/02
1118 //
1119 // The declarations for DIR and struct dirent are in jvm_win32.h.
1120
1121 // Caller must have already run dirname through JVM_NativePath, which removes
1122 // duplicate slashes and converts all instances of '/' into '\\'.
1123
1124 DIR * os::opendir(const char *dirname) {
1125 assert(dirname != NULL, "just checking"); // hotspot change
1126 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1127 DWORD fattr; // hotspot change
1128 char alt_dirname[4] = { 0, 0, 0, 0 };
1129
1130 if (dirp == 0) {
1131 errno = ENOMEM;
1132 return 0;
1133 }
1134
1135 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1136 // as a directory in FindFirstFile(). We detect this case here and
1137 // prepend the current drive name.
1138 //
1139 if (dirname[1] == '\0' && dirname[0] == '\\') {
1140 alt_dirname[0] = _getdrive() + 'A' - 1;
1141 alt_dirname[1] = ':';
1142 alt_dirname[2] = '\\';
1143 alt_dirname[3] = '\0';
1144 dirname = alt_dirname;
1145 }
1146
1147 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1148 if (dirp->path == 0) {
1149 free(dirp);
1150 errno = ENOMEM;
1151 return 0;
1152 }
1153 strcpy(dirp->path, dirname);
1154
1155 fattr = GetFileAttributes(dirp->path);
1156 if (fattr == 0xffffffff) {
1157 free(dirp->path);
1158 free(dirp);
1159 errno = ENOENT;
1160 return 0;
1161 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1162 free(dirp->path);
1163 free(dirp);
1164 errno = ENOTDIR;
1165 return 0;
1166 }
1167
1168 // Append "*.*", or possibly "\\*.*", to path
1169 if (dirp->path[1] == ':' &&
1170 (dirp->path[2] == '\0' ||
1171 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1172 // No '\\' needed for cases like "Z:" or "Z:\"
1173 strcat(dirp->path, "*.*");
1174 } else {
1175 strcat(dirp->path, "\\*.*");
1176 }
1177
1178 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1179 if (dirp->handle == INVALID_HANDLE_VALUE) {
1180 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1181 free(dirp->path);
1182 free(dirp);
1183 errno = EACCES;
1184 return 0;
1185 }
1186 }
1187 return dirp;
1188 }
1189
1190 struct dirent * os::readdir(DIR *dirp) {
1191 assert(dirp != NULL, "just checking"); // hotspot change
1192 if (dirp->handle == INVALID_HANDLE_VALUE) {
1193 return NULL;
1194 }
1195
1196 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1197
1198 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1199 if (GetLastError() == ERROR_INVALID_HANDLE) {
1200 errno = EBADF;
1201 return NULL;
1202 }
1203 FindClose(dirp->handle);
1204 dirp->handle = INVALID_HANDLE_VALUE;
1205 }
1206
1207 return &dirp->dirent;
1208 }
1209
1210 int os::closedir(DIR *dirp) {
1211 assert(dirp != NULL, "just checking"); // hotspot change
1212 if (dirp->handle != INVALID_HANDLE_VALUE) {
1213 if (!FindClose(dirp->handle)) {
1214 errno = EBADF;
1215 return -1;
1216 }
1217 dirp->handle = INVALID_HANDLE_VALUE;
1218 }
1219 free(dirp->path);
1220 free(dirp);
1221 return 0;
1222 }
1223
1224 // This must be hard coded because it's the system's temporary
1225 // directory not the java application's temp directory, ala java.io.tmpdir.
1226 const char* os::get_temp_directory() {
1227 static char path_buf[MAX_PATH];
1228 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1229 return path_buf;
1230 } else {
1231 path_buf[0] = '\0';
1232 return path_buf;
1233 }
1234 }
1235
1236 // Needs to be in os specific directory because windows requires another
1237 // header file <direct.h>
1238 const char* os::get_current_directory(char *buf, size_t buflen) {
1239 int n = static_cast<int>(buflen);
1240 if (buflen > INT_MAX) n = INT_MAX;
1241 return _getcwd(buf, n);
1242 }
1243
1244 //-----------------------------------------------------------
1245 // Helper functions for fatal error handler
1246 #ifdef _WIN64
1247 // Helper routine which returns true if address in
1248 // within the NTDLL address space.
1249 //
1250 static bool _addr_in_ntdll(address addr) {
1251 HMODULE hmod;
1252 MODULEINFO minfo;
1253
1254 hmod = GetModuleHandle("NTDLL.DLL");
1255 if (hmod == NULL) return false;
1256 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1257 &minfo, sizeof(MODULEINFO))) {
1258 return false;
1259 }
1260
1261 if ((addr >= minfo.lpBaseOfDll) &&
1262 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1263 return true;
1264 } else {
1265 return false;
1266 }
1267 }
1268 #endif
1269
1270 struct _modinfo {
1271 address addr;
1272 char* full_path; // point to a char buffer
1273 int buflen; // size of the buffer
1274 address base_addr;
1275 };
1276
1277 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1278 address top_address, void * param) {
1279 struct _modinfo *pmod = (struct _modinfo *)param;
1280 if (!pmod) return -1;
1281
1282 if (base_addr <= pmod->addr &&
1283 top_address > pmod->addr) {
1284 // if a buffer is provided, copy path name to the buffer
1285 if (pmod->full_path) {
1286 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1287 }
1288 pmod->base_addr = base_addr;
1289 return 1;
1290 }
1291 return 0;
1292 }
1293
1294 bool os::dll_address_to_library_name(address addr, char* buf,
1295 int buflen, int* offset) {
1296 // buf is not optional, but offset is optional
1297 assert(buf != NULL, "sanity check");
1298
1299 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1300 // return the full path to the DLL file, sometimes it returns path
1301 // to the corresponding PDB file (debug info); sometimes it only
1302 // returns partial path, which makes life painful.
1303
1304 struct _modinfo mi;
1305 mi.addr = addr;
1306 mi.full_path = buf;
1307 mi.buflen = buflen;
1308 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1309 // buf already contains path name
1310 if (offset) *offset = addr - mi.base_addr;
1311 return true;
1312 }
1313
1314 buf[0] = '\0';
1315 if (offset) *offset = -1;
1316 return false;
1317 }
1318
1319 bool os::dll_address_to_function_name(address addr, char *buf,
1320 int buflen, int *offset,
1321 bool demangle) {
1322 // buf is not optional, but offset is optional
1323 assert(buf != NULL, "sanity check");
1324
1325 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1326 return true;
1327 }
1328 if (offset != NULL) *offset = -1;
1329 buf[0] = '\0';
1330 return false;
1331 }
1332
1333 // save the start and end address of jvm.dll into param[0] and param[1]
1334 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1335 address top_address, void * param) {
1336 if (!param) return -1;
1337
1338 if (base_addr <= (address)_locate_jvm_dll &&
1339 top_address > (address)_locate_jvm_dll) {
1340 ((address*)param)[0] = base_addr;
1341 ((address*)param)[1] = top_address;
1342 return 1;
1343 }
1344 return 0;
1345 }
1346
1347 address vm_lib_location[2]; // start and end address of jvm.dll
1348
1349 // check if addr is inside jvm.dll
1350 bool os::address_is_in_vm(address addr) {
1351 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1352 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1353 assert(false, "Can't find jvm module.");
1354 return false;
1355 }
1356 }
1357
1358 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1359 }
1360
1361 // print module info; param is outputStream*
1362 static int _print_module(const char* fname, address base_address,
1363 address top_address, void* param) {
1364 if (!param) return -1;
1365
1366 outputStream* st = (outputStream*)param;
1367
1368 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1369 return 0;
1370 }
1371
1372 // Loads .dll/.so and
1373 // in case of error it checks if .dll/.so was built for the
1374 // same architecture as Hotspot is running on
1375 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1376 log_info(os)("attempting shared library load of %s", name);
1377
1378 void * result = LoadLibrary(name);
1379 if (result != NULL) {
1380 Events::log(NULL, "Loaded shared library %s", name);
1381 // Recalculate pdb search path if a DLL was loaded successfully.
1382 SymbolEngine::recalc_search_path();
1383 log_info(os)("shared library load of %s was successful", name);
1384 return result;
1385 }
1386 DWORD errcode = GetLastError();
1387 // Read system error message into ebuf
1388 // It may or may not be overwritten below (in the for loop and just above)
1389 lasterror(ebuf, (size_t) ebuflen);
1390 ebuf[ebuflen - 1] = '\0';
1391 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1392 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1393
1394 if (errcode == ERROR_MOD_NOT_FOUND) {
1395 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1396 ebuf[ebuflen - 1] = '\0';
1397 return NULL;
1398 }
1399
1400 // Parsing dll below
1401 // If we can read dll-info and find that dll was built
1402 // for an architecture other than Hotspot is running in
1403 // - then print to buffer "DLL was built for a different architecture"
1404 // else call os::lasterror to obtain system error message
1405 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1406 if (fd < 0) {
1407 return NULL;
1408 }
1409
1410 uint32_t signature_offset;
1411 uint16_t lib_arch = 0;
1412 bool failed_to_get_lib_arch =
1413 ( // Go to position 3c in the dll
1414 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1415 ||
1416 // Read location of signature
1417 (sizeof(signature_offset) !=
1418 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1419 ||
1420 // Go to COFF File Header in dll
1421 // that is located after "signature" (4 bytes long)
1422 (os::seek_to_file_offset(fd,
1423 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1424 ||
1425 // Read field that contains code of architecture
1426 // that dll was built for
1427 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1428 );
1429
1430 ::close(fd);
1431 if (failed_to_get_lib_arch) {
1432 // file i/o error - report os::lasterror(...) msg
1433 return NULL;
1434 }
1435
1436 typedef struct {
1437 uint16_t arch_code;
1438 char* arch_name;
1439 } arch_t;
1440
1441 static const arch_t arch_array[] = {
1442 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1443 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1444 {IMAGE_FILE_MACHINE_ARM64, (char*)"ARM 64"}
1445 };
1446 #if (defined _M_ARM64)
1447 static const uint16_t running_arch = IMAGE_FILE_MACHINE_ARM64;
1448 #elif (defined _M_AMD64)
1449 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1450 #elif (defined _M_IX86)
1451 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1452 #else
1453 #error Method os::dll_load requires that one of following \
1454 is defined :_M_AMD64 or _M_IX86 or _M_ARM64
1455 #endif
1456
1457
1458 // Obtain a string for printf operation
1459 // lib_arch_str shall contain string what platform this .dll was built for
1460 // running_arch_str shall string contain what platform Hotspot was built for
1461 char *running_arch_str = NULL, *lib_arch_str = NULL;
1462 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1463 if (lib_arch == arch_array[i].arch_code) {
1464 lib_arch_str = arch_array[i].arch_name;
1465 }
1466 if (running_arch == arch_array[i].arch_code) {
1467 running_arch_str = arch_array[i].arch_name;
1468 }
1469 }
1470
1471 assert(running_arch_str,
1472 "Didn't find running architecture code in arch_array");
1473
1474 // If the architecture is right
1475 // but some other error took place - report os::lasterror(...) msg
1476 if (lib_arch == running_arch) {
1477 return NULL;
1478 }
1479
1480 if (lib_arch_str != NULL) {
1481 ::_snprintf(ebuf, ebuflen - 1,
1482 "Can't load %s-bit .dll on a %s-bit platform",
1483 lib_arch_str, running_arch_str);
1484 } else {
1485 // don't know what architecture this dll was build for
1486 ::_snprintf(ebuf, ebuflen - 1,
1487 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1488 lib_arch, running_arch_str);
1489 }
1490
1491 return NULL;
1492 }
1493
1494 void os::print_dll_info(outputStream *st) {
1495 st->print_cr("Dynamic libraries:");
1496 get_loaded_modules_info(_print_module, (void *)st);
1497 }
1498
1499 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1500 HANDLE hProcess;
1501
1502 # define MAX_NUM_MODULES 128
1503 HMODULE modules[MAX_NUM_MODULES];
1504 static char filename[MAX_PATH];
1505 int result = 0;
1506
1507 int pid = os::current_process_id();
1508 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1509 FALSE, pid);
1510 if (hProcess == NULL) return 0;
1511
1512 DWORD size_needed;
1513 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1514 CloseHandle(hProcess);
1515 return 0;
1516 }
1517
1518 // number of modules that are currently loaded
1519 int num_modules = size_needed / sizeof(HMODULE);
1520
1521 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1522 // Get Full pathname:
1523 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1524 filename[0] = '\0';
1525 }
1526
1527 MODULEINFO modinfo;
1528 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1529 modinfo.lpBaseOfDll = NULL;
1530 modinfo.SizeOfImage = 0;
1531 }
1532
1533 // Invoke callback function
1534 result = callback(filename, (address)modinfo.lpBaseOfDll,
1535 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1536 if (result) break;
1537 }
1538
1539 CloseHandle(hProcess);
1540 return result;
1541 }
1542
1543 bool os::get_host_name(char* buf, size_t buflen) {
1544 DWORD size = (DWORD)buflen;
1545 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1546 }
1547
1548 void os::get_summary_os_info(char* buf, size_t buflen) {
1549 stringStream sst(buf, buflen);
1550 os::win32::print_windows_version(&sst);
1551 // chop off newline character
1552 char* nl = strchr(buf, '\n');
1553 if (nl != NULL) *nl = '\0';
1554 }
1555
1556 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1557 #if _MSC_VER >= 1900
1558 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1559 int result = ::vsnprintf(buf, len, fmt, args);
1560 // If an encoding error occurred (result < 0) then it's not clear
1561 // whether the buffer is NUL terminated, so ensure it is.
1562 if ((result < 0) && (len > 0)) {
1563 buf[len - 1] = '\0';
1564 }
1565 return result;
1566 #else
1567 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1568 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1569 // versions. However, when len == 0, avoid _vsnprintf too, and just
1570 // go straight to _vscprintf. The output is going to be truncated in
1571 // that case, except in the unusual case of empty output. More
1572 // importantly, the documentation for various versions of Visual Studio
1573 // are inconsistent about the behavior of _vsnprintf when len == 0,
1574 // including it possibly being an error.
1575 int result = -1;
1576 if (len > 0) {
1577 result = _vsnprintf(buf, len, fmt, args);
1578 // If output (including NUL terminator) is truncated, the buffer
1579 // won't be NUL terminated. Add the trailing NUL specified by C99.
1580 if ((result < 0) || ((size_t)result >= len)) {
1581 buf[len - 1] = '\0';
1582 }
1583 }
1584 if (result < 0) {
1585 result = _vscprintf(fmt, args);
1586 }
1587 return result;
1588 #endif // _MSC_VER dispatch
1589 }
1590
1591 static inline time_t get_mtime(const char* filename) {
1592 struct stat st;
1593 int ret = os::stat(filename, &st);
1594 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1595 return st.st_mtime;
1596 }
1597
1598 int os::compare_file_modified_times(const char* file1, const char* file2) {
1599 time_t t1 = get_mtime(file1);
1600 time_t t2 = get_mtime(file2);
1601 return t1 - t2;
1602 }
1603
1604 void os::print_os_info_brief(outputStream* st) {
1605 os::print_os_info(st);
1606 }
1607
1608 void os::win32::print_uptime_info(outputStream* st) {
1609 unsigned long long ticks = GetTickCount64();
1610 os::print_dhm(st, "OS uptime:", ticks/1000);
1611 }
1612
1613 void os::print_os_info(outputStream* st) {
1614 #ifdef ASSERT
1615 char buffer[1024];
1616 st->print("HostName: ");
1617 if (get_host_name(buffer, sizeof(buffer))) {
1618 st->print("%s ", buffer);
1619 } else {
1620 st->print("N/A ");
1621 }
1622 #endif
1623 st->print_cr("OS:");
1624 os::win32::print_windows_version(st);
1625
1626 os::win32::print_uptime_info(st);
1627
1628 #ifdef _LP64
1629 VM_Version::print_platform_virtualization_info(st);
1630 #endif
1631 }
1632
1633 void os::win32::print_windows_version(outputStream* st) {
1634 OSVERSIONINFOEX osvi;
1635 VS_FIXEDFILEINFO *file_info;
1636 TCHAR kernel32_path[MAX_PATH];
1637 UINT len, ret;
1638
1639 // Use the GetVersionEx information to see if we're on a server or
1640 // workstation edition of Windows. Starting with Windows 8.1 we can't
1641 // trust the OS version information returned by this API.
1642 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1643 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1644 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1645 st->print_cr("Call to GetVersionEx failed");
1646 return;
1647 }
1648 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1649
1650 // Get the full path to \Windows\System32\kernel32.dll and use that for
1651 // determining what version of Windows we're running on.
1652 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1653 ret = GetSystemDirectory(kernel32_path, len);
1654 if (ret == 0 || ret > len) {
1655 st->print_cr("Call to GetSystemDirectory failed");
1656 return;
1657 }
1658 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1659
1660 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1661 if (version_size == 0) {
1662 st->print_cr("Call to GetFileVersionInfoSize failed");
1663 return;
1664 }
1665
1666 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1667 if (version_info == NULL) {
1668 st->print_cr("Failed to allocate version_info");
1669 return;
1670 }
1671
1672 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1673 os::free(version_info);
1674 st->print_cr("Call to GetFileVersionInfo failed");
1675 return;
1676 }
1677
1678 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1679 os::free(version_info);
1680 st->print_cr("Call to VerQueryValue failed");
1681 return;
1682 }
1683
1684 int major_version = HIWORD(file_info->dwProductVersionMS);
1685 int minor_version = LOWORD(file_info->dwProductVersionMS);
1686 int build_number = HIWORD(file_info->dwProductVersionLS);
1687 int build_minor = LOWORD(file_info->dwProductVersionLS);
1688 int os_vers = major_version * 1000 + minor_version;
1689 os::free(version_info);
1690
1691 st->print(" Windows ");
1692 switch (os_vers) {
1693
1694 case 6000:
1695 if (is_workstation) {
1696 st->print("Vista");
1697 } else {
1698 st->print("Server 2008");
1699 }
1700 break;
1701
1702 case 6001:
1703 if (is_workstation) {
1704 st->print("7");
1705 } else {
1706 st->print("Server 2008 R2");
1707 }
1708 break;
1709
1710 case 6002:
1711 if (is_workstation) {
1712 st->print("8");
1713 } else {
1714 st->print("Server 2012");
1715 }
1716 break;
1717
1718 case 6003:
1719 if (is_workstation) {
1720 st->print("8.1");
1721 } else {
1722 st->print("Server 2012 R2");
1723 }
1724 break;
1725
1726 case 10000:
1727 if (is_workstation) {
1728 st->print("10");
1729 } else {
1730 // distinguish Windows Server 2016 and 2019 by build number
1731 // Windows server 2019 GA 10/2018 build number is 17763
1732 if (build_number > 17762) {
1733 st->print("Server 2019");
1734 } else {
1735 st->print("Server 2016");
1736 }
1737 }
1738 break;
1739
1740 default:
1741 // Unrecognized windows, print out its major and minor versions
1742 st->print("%d.%d", major_version, minor_version);
1743 break;
1744 }
1745
1746 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1747 // find out whether we are running on 64 bit processor or not
1748 SYSTEM_INFO si;
1749 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1750 GetNativeSystemInfo(&si);
1751 if ((si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) ||
1752 (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_ARM64)) {
1753 st->print(" , 64 bit");
1754 }
1755
1756 st->print(" Build %d", build_number);
1757 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1758 st->cr();
1759 }
1760
1761 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1762 // Nothing to do for now.
1763 }
1764
1765 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1766 HKEY key;
1767 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1768 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1769 if (status == ERROR_SUCCESS) {
1770 DWORD size = (DWORD)buflen;
1771 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1772 if (status != ERROR_SUCCESS) {
1773 strncpy(buf, "## __CPU__", buflen);
1774 }
1775 RegCloseKey(key);
1776 } else {
1777 // Put generic cpu info to return
1778 strncpy(buf, "## __CPU__", buflen);
1779 }
1780 }
1781
1782 void os::print_memory_info(outputStream* st) {
1783 st->print("Memory:");
1784 st->print(" %dk page", os::vm_page_size()>>10);
1785
1786 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1787 // value if total memory is larger than 4GB
1788 MEMORYSTATUSEX ms;
1789 ms.dwLength = sizeof(ms);
1790 int r1 = GlobalMemoryStatusEx(&ms);
1791
1792 if (r1 != 0) {
1793 st->print(", system-wide physical " INT64_FORMAT "M ",
1794 (int64_t) ms.ullTotalPhys >> 20);
1795 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1796
1797 st->print("TotalPageFile size " INT64_FORMAT "M ",
1798 (int64_t) ms.ullTotalPageFile >> 20);
1799 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1800 (int64_t) ms.ullAvailPageFile >> 20);
1801
1802 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1803 #if defined(_M_IX86)
1804 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1805 (int64_t) ms.ullTotalVirtual >> 20);
1806 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1807 #endif
1808 } else {
1809 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1810 }
1811
1812 // extended memory statistics for a process
1813 PROCESS_MEMORY_COUNTERS_EX pmex;
1814 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1815 pmex.cb = sizeof(pmex);
1816 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1817
1818 if (r2 != 0) {
1819 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1820 (int64_t) pmex.WorkingSetSize >> 20);
1821 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1822
1823 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1824 (int64_t) pmex.PrivateUsage >> 20);
1825 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1826 } else {
1827 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1828 }
1829
1830 st->cr();
1831 }
1832
1833 bool os::signal_sent_by_kill(const void* siginfo) {
1834 // TODO: Is this possible?
1835 return false;
1836 }
1837
1838 void os::print_siginfo(outputStream *st, const void* siginfo) {
1839 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1840 st->print("siginfo:");
1841
1842 char tmp[64];
1843 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1844 strcpy(tmp, "EXCEPTION_??");
1845 }
1846 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1847
1848 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1849 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1850 er->NumberParameters >= 2) {
1851 switch (er->ExceptionInformation[0]) {
1852 case 0: st->print(", reading address"); break;
1853 case 1: st->print(", writing address"); break;
1854 case 8: st->print(", data execution prevention violation at address"); break;
1855 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1856 er->ExceptionInformation[0]);
1857 }
1858 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1859 } else {
1860 int num = er->NumberParameters;
1861 if (num > 0) {
1862 st->print(", ExceptionInformation=");
1863 for (int i = 0; i < num; i++) {
1864 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1865 }
1866 }
1867 }
1868 st->cr();
1869 }
1870
1871 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1872 // TODO: Can we kill thread?
1873 return false;
1874 }
1875
1876 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1877 // do nothing
1878 }
1879
1880 static char saved_jvm_path[MAX_PATH] = {0};
1881
1882 // Find the full path to the current module, jvm.dll
1883 void os::jvm_path(char *buf, jint buflen) {
1884 // Error checking.
1885 if (buflen < MAX_PATH) {
1886 assert(false, "must use a large-enough buffer");
1887 buf[0] = '\0';
1888 return;
1889 }
1890 // Lazy resolve the path to current module.
1891 if (saved_jvm_path[0] != 0) {
1892 strcpy(buf, saved_jvm_path);
1893 return;
1894 }
1895
1896 buf[0] = '\0';
1897 if (Arguments::sun_java_launcher_is_altjvm()) {
1898 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1899 // for a JAVA_HOME environment variable and fix up the path so it
1900 // looks like jvm.dll is installed there (append a fake suffix
1901 // hotspot/jvm.dll).
1902 char* java_home_var = ::getenv("JAVA_HOME");
1903 if (java_home_var != NULL && java_home_var[0] != 0 &&
1904 strlen(java_home_var) < (size_t)buflen) {
1905 strncpy(buf, java_home_var, buflen);
1906
1907 // determine if this is a legacy image or modules image
1908 // modules image doesn't have "jre" subdirectory
1909 size_t len = strlen(buf);
1910 char* jrebin_p = buf + len;
1911 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1912 if (0 != _access(buf, 0)) {
1913 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1914 }
1915 len = strlen(buf);
1916 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1917 }
1918 }
1919
1920 if (buf[0] == '\0') {
1921 GetModuleFileName(vm_lib_handle, buf, buflen);
1922 }
1923 strncpy(saved_jvm_path, buf, MAX_PATH);
1924 saved_jvm_path[MAX_PATH - 1] = '\0';
1925 }
1926
1927
1928 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1929 #ifndef _WIN64
1930 st->print("_");
1931 #endif
1932 }
1933
1934
1935 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1936 #ifndef _WIN64
1937 st->print("@%d", args_size * sizeof(int));
1938 #endif
1939 }
1940
1941 // This method is a copy of JDK's sysGetLastErrorString
1942 // from src/windows/hpi/src/system_md.c
1943
1944 size_t os::lasterror(char* buf, size_t len) {
1945 DWORD errval;
1946
1947 if ((errval = GetLastError()) != 0) {
1948 // DOS error
1949 size_t n = (size_t)FormatMessage(
1950 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1951 NULL,
1952 errval,
1953 0,
1954 buf,
1955 (DWORD)len,
1956 NULL);
1957 if (n > 3) {
1958 // Drop final '.', CR, LF
1959 if (buf[n - 1] == '\n') n--;
1960 if (buf[n - 1] == '\r') n--;
1961 if (buf[n - 1] == '.') n--;
1962 buf[n] = '\0';
1963 }
1964 return n;
1965 }
1966
1967 if (errno != 0) {
1968 // C runtime error that has no corresponding DOS error code
1969 const char* s = os::strerror(errno);
1970 size_t n = strlen(s);
1971 if (n >= len) n = len - 1;
1972 strncpy(buf, s, n);
1973 buf[n] = '\0';
1974 return n;
1975 }
1976
1977 return 0;
1978 }
1979
1980 int os::get_last_error() {
1981 DWORD error = GetLastError();
1982 if (error == 0) {
1983 error = errno;
1984 }
1985 return (int)error;
1986 }
1987
1988 // sun.misc.Signal
1989 // NOTE that this is a workaround for an apparent kernel bug where if
1990 // a signal handler for SIGBREAK is installed then that signal handler
1991 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1992 // See bug 4416763.
1993 static void (*sigbreakHandler)(int) = NULL;
1994
1995 static void UserHandler(int sig, void *siginfo, void *context) {
1996 os::signal_notify(sig);
1997 // We need to reinstate the signal handler each time...
1998 os::signal(sig, (void*)UserHandler);
1999 }
2000
2001 void* os::user_handler() {
2002 return (void*) UserHandler;
2003 }
2004
2005 void* os::signal(int signal_number, void* handler) {
2006 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
2007 void (*oldHandler)(int) = sigbreakHandler;
2008 sigbreakHandler = (void (*)(int)) handler;
2009 return (void*) oldHandler;
2010 } else {
2011 return (void*)::signal(signal_number, (void (*)(int))handler);
2012 }
2013 }
2014
2015 void os::signal_raise(int signal_number) {
2016 raise(signal_number);
2017 }
2018
2019 // The Win32 C runtime library maps all console control events other than ^C
2020 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2021 // logoff, and shutdown events. We therefore install our own console handler
2022 // that raises SIGTERM for the latter cases.
2023 //
2024 static BOOL WINAPI consoleHandler(DWORD event) {
2025 switch (event) {
2026 case CTRL_C_EVENT:
2027 if (VMError::is_error_reported()) {
2028 // Ctrl-C is pressed during error reporting, likely because the error
2029 // handler fails to abort. Let VM die immediately.
2030 os::die();
2031 }
2032
2033 os::signal_raise(SIGINT);
2034 return TRUE;
2035 break;
2036 case CTRL_BREAK_EVENT:
2037 if (sigbreakHandler != NULL) {
2038 (*sigbreakHandler)(SIGBREAK);
2039 }
2040 return TRUE;
2041 break;
2042 case CTRL_LOGOFF_EVENT: {
2043 // Don't terminate JVM if it is running in a non-interactive session,
2044 // such as a service process.
2045 USEROBJECTFLAGS flags;
2046 HANDLE handle = GetProcessWindowStation();
2047 if (handle != NULL &&
2048 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2049 sizeof(USEROBJECTFLAGS), NULL)) {
2050 // If it is a non-interactive session, let next handler to deal
2051 // with it.
2052 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2053 return FALSE;
2054 }
2055 }
2056 }
2057 case CTRL_CLOSE_EVENT:
2058 case CTRL_SHUTDOWN_EVENT:
2059 os::signal_raise(SIGTERM);
2060 return TRUE;
2061 break;
2062 default:
2063 break;
2064 }
2065 return FALSE;
2066 }
2067
2068 // The following code is moved from os.cpp for making this
2069 // code platform specific, which it is by its very nature.
2070
2071 // Return maximum OS signal used + 1 for internal use only
2072 // Used as exit signal for signal_thread
2073 int os::sigexitnum_pd() {
2074 return NSIG;
2075 }
2076
2077 // a counter for each possible signal value, including signal_thread exit signal
2078 static volatile jint pending_signals[NSIG+1] = { 0 };
2079 static Semaphore* sig_sem = NULL;
2080
2081 static void jdk_misc_signal_init() {
2082 // Initialize signal structures
2083 memset((void*)pending_signals, 0, sizeof(pending_signals));
2084
2085 // Initialize signal semaphore
2086 sig_sem = new Semaphore();
2087
2088 // Programs embedding the VM do not want it to attempt to receive
2089 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2090 // shutdown hooks mechanism introduced in 1.3. For example, when
2091 // the VM is run as part of a Windows NT service (i.e., a servlet
2092 // engine in a web server), the correct behavior is for any console
2093 // control handler to return FALSE, not TRUE, because the OS's
2094 // "final" handler for such events allows the process to continue if
2095 // it is a service (while terminating it if it is not a service).
2096 // To make this behavior uniform and the mechanism simpler, we
2097 // completely disable the VM's usage of these console events if -Xrs
2098 // (=ReduceSignalUsage) is specified. This means, for example, that
2099 // the CTRL-BREAK thread dump mechanism is also disabled in this
2100 // case. See bugs 4323062, 4345157, and related bugs.
2101
2102 // Add a CTRL-C handler
2103 SetConsoleCtrlHandler(consoleHandler, TRUE);
2104 }
2105
2106 void os::signal_notify(int sig) {
2107 if (sig_sem != NULL) {
2108 Atomic::inc(&pending_signals[sig]);
2109 sig_sem->signal();
2110 } else {
2111 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2112 // initialization isn't called.
2113 assert(ReduceSignalUsage, "signal semaphore should be created");
2114 }
2115 }
2116
2117 static int check_pending_signals() {
2118 while (true) {
2119 for (int i = 0; i < NSIG + 1; i++) {
2120 jint n = pending_signals[i];
2121 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
2122 return i;
2123 }
2124 }
2125 JavaThread *thread = JavaThread::current();
2126
2127 ThreadBlockInVM tbivm(thread);
2128
2129 bool threadIsSuspended;
2130 do {
2131 thread->set_suspend_equivalent();
2132 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2133 sig_sem->wait();
2134
2135 // were we externally suspended while we were waiting?
2136 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2137 if (threadIsSuspended) {
2138 // The semaphore has been incremented, but while we were waiting
2139 // another thread suspended us. We don't want to continue running
2140 // while suspended because that would surprise the thread that
2141 // suspended us.
2142 sig_sem->signal();
2143
2144 thread->java_suspend_self();
2145 }
2146 } while (threadIsSuspended);
2147 }
2148 }
2149
2150 int os::signal_wait() {
2151 return check_pending_signals();
2152 }
2153
2154 // Implicit OS exception handling
2155
2156 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2157 address handler) {
2158 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2159 // Save pc in thread
2160 #if defined(_M_ARM64)
2161 // Do not blow up if no thread info available.
2162 if (thread) {
2163 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Pc);
2164 }
2165 // Set pc to handler
2166 exceptionInfo->ContextRecord->Pc = (DWORD64)handler;
2167 #elif defined(_M_AMD64)
2168 // Do not blow up if no thread info available.
2169 if (thread) {
2170 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2171 }
2172 // Set pc to handler
2173 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2174 #else
2175 // Do not blow up if no thread info available.
2176 if (thread) {
2177 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2178 }
2179 // Set pc to handler
2180 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2181 #endif
2182
2183 // Continue the execution
2184 return EXCEPTION_CONTINUE_EXECUTION;
2185 }
2186
2187
2188 // Used for PostMortemDump
2189 extern "C" void safepoints();
2190 extern "C" void find(int x);
2191 extern "C" void events();
2192
2193 // According to Windows API documentation, an illegal instruction sequence should generate
2194 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2195 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2196 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2197
2198 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2199
2200 // From "Execution Protection in the Windows Operating System" draft 0.35
2201 // Once a system header becomes available, the "real" define should be
2202 // included or copied here.
2203 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2204
2205 // Windows Vista/2008 heap corruption check
2206 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2207
2208 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2209 // C++ compiler contain this error code. Because this is a compiler-generated
2210 // error, the code is not listed in the Win32 API header files.
2211 // The code is actually a cryptic mnemonic device, with the initial "E"
2212 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2213 // ASCII values of "msc".
2214
2215 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2216
2217 #define def_excpt(val) { #val, (val) }
2218
2219 static const struct { const char* name; uint number; } exceptlabels[] = {
2220 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2221 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2222 def_excpt(EXCEPTION_BREAKPOINT),
2223 def_excpt(EXCEPTION_SINGLE_STEP),
2224 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2225 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2226 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2227 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2228 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2229 def_excpt(EXCEPTION_FLT_OVERFLOW),
2230 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2231 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2232 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2233 def_excpt(EXCEPTION_INT_OVERFLOW),
2234 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2235 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2236 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2237 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2238 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2239 def_excpt(EXCEPTION_STACK_OVERFLOW),
2240 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2241 def_excpt(EXCEPTION_GUARD_PAGE),
2242 def_excpt(EXCEPTION_INVALID_HANDLE),
2243 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2244 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2245 };
2246
2247 #undef def_excpt
2248
2249 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2250 uint code = static_cast<uint>(exception_code);
2251 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2252 if (exceptlabels[i].number == code) {
2253 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2254 return buf;
2255 }
2256 }
2257
2258 return NULL;
2259 }
2260
2261 //-----------------------------------------------------------------------------
2262 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2263 // handle exception caused by idiv; should only happen for -MinInt/-1
2264 // (division by zero is handled explicitly)
2265 #if defined(_M_ARM64)
2266 PCONTEXT ctx = exceptionInfo->ContextRecord;
2267 address pc = (address)ctx->Sp;
2268 assert(pc[0] == 0x83, "not an sdiv opcode"); //Fixme did i get the right opcode?
2269 assert(ctx->X4 == min_jint, "unexpected idiv exception");
2270 // set correct result values and continue after idiv instruction
2271 ctx->Pc = (uint64_t)pc + 4; // idiv reg, reg, reg is 4 bytes
2272 ctx->X4 = (uint64_t)min_jint; // result
2273 ctx->X5 = (uint64_t)0; // remainder
2274 // Continue the execution
2275 #elif defined(_M_AMD64)
2276 PCONTEXT ctx = exceptionInfo->ContextRecord;
2277 address pc = (address)ctx->Rip;
2278 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2279 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2280 if (pc[0] == 0xF7) {
2281 // set correct result values and continue after idiv instruction
2282 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2283 } else {
2284 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2285 }
2286 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2287 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2288 // idiv opcode (0xF7).
2289 ctx->Rdx = (DWORD)0; // remainder
2290 // Continue the execution
2291 #else
2292 PCONTEXT ctx = exceptionInfo->ContextRecord;
2293 address pc = (address)ctx->Eip;
2294 assert(pc[0] == 0xF7, "not an idiv opcode");
2295 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2296 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2297 // set correct result values and continue after idiv instruction
2298 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2299 ctx->Eax = (DWORD)min_jint; // result
2300 ctx->Edx = (DWORD)0; // remainder
2301 // Continue the execution
2302 #endif
2303 return EXCEPTION_CONTINUE_EXECUTION;
2304 }
2305
2306 #if defined(_M_AMD64) || defined(_M_IX86)
2307 //-----------------------------------------------------------------------------
2308 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2309 PCONTEXT ctx = exceptionInfo->ContextRecord;
2310 #ifndef _WIN64
2311 // handle exception caused by native method modifying control word
2312 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2313
2314 switch (exception_code) {
2315 case EXCEPTION_FLT_DENORMAL_OPERAND:
2316 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2317 case EXCEPTION_FLT_INEXACT_RESULT:
2318 case EXCEPTION_FLT_INVALID_OPERATION:
2319 case EXCEPTION_FLT_OVERFLOW:
2320 case EXCEPTION_FLT_STACK_CHECK:
2321 case EXCEPTION_FLT_UNDERFLOW:
2322 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2323 if (fp_control_word != ctx->FloatSave.ControlWord) {
2324 // Restore FPCW and mask out FLT exceptions
2325 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2326 // Mask out pending FLT exceptions
2327 ctx->FloatSave.StatusWord &= 0xffffff00;
2328 return EXCEPTION_CONTINUE_EXECUTION;
2329 }
2330 }
2331
2332 if (prev_uef_handler != NULL) {
2333 // We didn't handle this exception so pass it to the previous
2334 // UnhandledExceptionFilter.
2335 return (prev_uef_handler)(exceptionInfo);
2336 }
2337 #else // !_WIN64
2338 // On Windows, the mxcsr control bits are non-volatile across calls
2339 // See also CR 6192333
2340 //
2341 jint MxCsr = INITIAL_MXCSR;
2342 // we can't use StubRoutines::addr_mxcsr_std()
2343 // because in Win64 mxcsr is not saved there
2344 if (MxCsr != ctx->MxCsr) {
2345 ctx->MxCsr = MxCsr;
2346 return EXCEPTION_CONTINUE_EXECUTION;
2347 }
2348 #endif // !_WIN64
2349
2350 return EXCEPTION_CONTINUE_SEARCH;
2351 }
2352 #endif
2353
2354 static inline void report_error(Thread* t, DWORD exception_code,
2355 address addr, void* siginfo, void* context) {
2356 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2357
2358 // If UseOsErrorReporting, this will return here and save the error file
2359 // somewhere where we can find it in the minidump.
2360 }
2361
2362 //-----------------------------------------------------------------------------
2363 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2364 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2365 PEXCEPTION_RECORD exception_record = exceptionInfo->ExceptionRecord;
2366 DWORD exception_code = exception_record->ExceptionCode;
2367 #if defined(_M_ARM64)
2368 address pc = (address) exceptionInfo->ContextRecord->Pc;
2369 #elif defined(_M_AMD64)
2370 address pc = (address) exceptionInfo->ContextRecord->Rip;
2371 #else
2372 address pc = (address) exceptionInfo->ContextRecord->Eip;
2373 #endif
2374 Thread* t = Thread::current_or_null_safe();
2375
2376 // Handle SafeFetch32 and SafeFetchN exceptions.
2377 if (StubRoutines::is_safefetch_fault(pc)) {
2378 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2379 }
2380
2381 #ifndef _WIN64
2382 // Execution protection violation - win32 running on AMD64 only
2383 // Handled first to avoid misdiagnosis as a "normal" access violation;
2384 // This is safe to do because we have a new/unique ExceptionInformation
2385 // code for this condition.
2386 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2387 int exception_subcode = (int) exception_record->ExceptionInformation[0];
2388 address addr = (address) exception_record->ExceptionInformation[1];
2389
2390 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2391 int page_size = os::vm_page_size();
2392
2393 // Make sure the pc and the faulting address are sane.
2394 //
2395 // If an instruction spans a page boundary, and the page containing
2396 // the beginning of the instruction is executable but the following
2397 // page is not, the pc and the faulting address might be slightly
2398 // different - we still want to unguard the 2nd page in this case.
2399 //
2400 // 15 bytes seems to be a (very) safe value for max instruction size.
2401 bool pc_is_near_addr =
2402 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2403 bool instr_spans_page_boundary =
2404 (align_down((intptr_t) pc ^ (intptr_t) addr,
2405 (intptr_t) page_size) > 0);
2406
2407 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2408 static volatile address last_addr =
2409 (address) os::non_memory_address_word();
2410
2411 // In conservative mode, don't unguard unless the address is in the VM
2412 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2413 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2414
2415 // Set memory to RWX and retry
2416 address page_start = align_down(addr, page_size);
2417 bool res = os::protect_memory((char*) page_start, page_size,
2418 os::MEM_PROT_RWX);
2419
2420 log_debug(os)("Execution protection violation "
2421 "at " INTPTR_FORMAT
2422 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2423 p2i(page_start), (res ? "success" : os::strerror(errno)));
2424
2425 // Set last_addr so if we fault again at the same address, we don't
2426 // end up in an endless loop.
2427 //
2428 // There are two potential complications here. Two threads trapping
2429 // at the same address at the same time could cause one of the
2430 // threads to think it already unguarded, and abort the VM. Likely
2431 // very rare.
2432 //
2433 // The other race involves two threads alternately trapping at
2434 // different addresses and failing to unguard the page, resulting in
2435 // an endless loop. This condition is probably even more unlikely
2436 // than the first.
2437 //
2438 // Although both cases could be avoided by using locks or thread
2439 // local last_addr, these solutions are unnecessary complication:
2440 // this handler is a best-effort safety net, not a complete solution.
2441 // It is disabled by default and should only be used as a workaround
2442 // in case we missed any no-execute-unsafe VM code.
2443
2444 last_addr = addr;
2445
2446 return EXCEPTION_CONTINUE_EXECUTION;
2447 }
2448 }
2449
2450 // Last unguard failed or not unguarding
2451 tty->print_raw_cr("Execution protection violation");
2452 #if !defined(USE_VECTORED_EXCEPTION_HANDLING)
2453 report_error(t, exception_code, addr, exception_record,
2454 exceptionInfo->ContextRecord);
2455 #endif
2456 return EXCEPTION_CONTINUE_SEARCH;
2457 }
2458 }
2459 #endif // _WIN64
2460
2461 #if defined(_M_AMD64) || defined(_M_IX86)
2462 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2463 VM_Version::is_cpuinfo_segv_addr(pc)) {
2464 // Verify that OS save/restore AVX registers.
2465 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2466 }
2467 #endif
2468
2469 if (t != NULL && t->is_Java_thread()) {
2470 JavaThread* thread = (JavaThread*) t;
2471 bool in_java = thread->thread_state() == _thread_in_Java;
2472 bool in_native = thread->thread_state() == _thread_in_native;
2473 bool in_vm = thread->thread_state() == _thread_in_vm;
2474
2475 // Handle potential stack overflows up front.
2476 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2477 if (thread->stack_guards_enabled()) {
2478 if (in_java) {
2479 frame fr;
2480 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2481 assert(fr.is_java_frame(), "Must be a Java frame");
2482 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2483 }
2484 }
2485 // Yellow zone violation. The o/s has unprotected the first yellow
2486 // zone page for us. Note: must call disable_stack_yellow_zone to
2487 // update the enabled status, even if the zone contains only one page.
2488 assert(!in_vm, "Undersized StackShadowPages");
2489 thread->disable_stack_yellow_reserved_zone();
2490 // If not in java code, return and hope for the best.
2491 return in_java
2492 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2493 : EXCEPTION_CONTINUE_EXECUTION;
2494 } else {
2495 // Fatal red zone violation.
2496 thread->disable_stack_red_zone();
2497 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2498 #if !defined(USE_VECTORED_EXCEPTION_HANDLING)
2499 report_error(t, exception_code, pc, exception_record,
2500 exceptionInfo->ContextRecord);
2501 #endif
2502 return EXCEPTION_CONTINUE_SEARCH;
2503 }
2504 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2505 if (in_java) {
2506 // Either stack overflow or null pointer exception.
2507 address addr = (address) exception_record->ExceptionInformation[1];
2508 address stack_end = thread->stack_end();
2509 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2510 // Stack overflow.
2511 assert(!os::uses_stack_guard_pages(),
2512 "should be caught by red zone code above.");
2513 return Handle_Exception(exceptionInfo,
2514 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2515 }
2516 // Check for safepoint polling and implicit null
2517 // We only expect null pointers in the stubs (vtable)
2518 // the rest are checked explicitly now.
2519 CodeBlob* cb = CodeCache::find_blob(pc);
2520 if (cb != NULL) {
2521 if (SafepointMechanism::is_poll_address(addr)) {
2522 address stub = SharedRuntime::get_poll_stub(pc);
2523 return Handle_Exception(exceptionInfo, stub);
2524 }
2525 }
2526 #ifdef _WIN64
2527 // If it's a legal stack address map the entire region in
2528 if (thread->is_in_usable_stack(addr)) {
2529 addr = (address)((uintptr_t)addr &
2530 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2531 os::commit_memory((char *)addr, thread->stack_base() - addr,
2532 !ExecMem);
2533 return EXCEPTION_CONTINUE_EXECUTION;
2534 }
2535 #endif
2536 // Null pointer exception.
2537 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2538 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2539 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2540 }
2541 report_error(t, exception_code, pc, exception_record,
2542 exceptionInfo->ContextRecord);
2543 return EXCEPTION_CONTINUE_SEARCH;
2544 }
2545
2546 #ifdef _M_ARM64
2547 // Unsafe memory access
2548 CompiledMethod* nm = NULL;
2549 JavaThread* thread = (JavaThread*)t;
2550 if (in_java) {
2551 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2552 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2553 }
2554
2555 bool is_unsafe_arraycopy = (in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2556 if (is_unsafe_arraycopy ||
2557 ((in_vm || in_native) && thread->doing_unsafe_access()) ||
2558 (nm != NULL && nm->has_unsafe_access())) {
2559 address next_pc = Assembler::locate_next_instruction(pc);
2560 if (is_unsafe_arraycopy) {
2561 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2562 }
2563 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2564 }
2565 #endif
2566
2567 #ifdef _WIN64
2568 // Special care for fast JNI field accessors.
2569 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2570 // in and the heap gets shrunk before the field access.
2571 address slowcase_pc = JNI_FastGetField::find_slowcase_pc(pc);
2572 if (slowcase_pc != (address)-1) {
2573 return Handle_Exception(exceptionInfo, slowcase_pc);
2574 }
2575 #endif
2576
2577 // Stack overflow or null pointer exception in native code.
2578 #if !defined(USE_VECTORED_EXCEPTION_HANDLING)
2579 report_error(t, exception_code, pc, exception_record,
2580 exceptionInfo->ContextRecord);
2581 #endif
2582 return EXCEPTION_CONTINUE_SEARCH;
2583 } // /EXCEPTION_ACCESS_VIOLATION
2584 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2585
2586 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2587 CompiledMethod* nm = NULL;
2588 JavaThread* thread = (JavaThread*)t;
2589 if (in_java) {
2590 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2591 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2592 }
2593
2594 bool is_unsafe_arraycopy = (in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2595 if (((in_vm || in_native || is_unsafe_arraycopy) && thread->doing_unsafe_access()) ||
2596 (nm != NULL && nm->has_unsafe_access())) {
2597 address next_pc = Assembler::locate_next_instruction(pc);
2598 if (is_unsafe_arraycopy) {
2599 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2600 }
2601 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2602 }
2603 }
2604
2605 #ifdef _M_ARM64
2606 if (in_java &&
2607 (exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2608 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2609 if (nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
2610 if (TraceTraps) {
2611 tty->print_cr("trap: zombie_not_entrant");
2612 }
2613 return Handle_Exception(exceptionInfo, SharedRuntime::get_handle_wrong_method_stub());
2614 }
2615 }
2616 #endif
2617
2618 if (in_java) {
2619 switch (exception_code) {
2620 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2621 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2622
2623 case EXCEPTION_INT_OVERFLOW:
2624 return Handle_IDiv_Exception(exceptionInfo);
2625
2626 } // switch
2627 }
2628
2629 #if defined(_M_AMD64) || defined(_M_IX86)
2630 if ((in_java || in_native) && exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2631 LONG result=Handle_FLT_Exception(exceptionInfo);
2632 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2633 }
2634 #endif
2635 }
2636
2637 #if !defined(USE_VECTORED_EXCEPTION_HANDLING)
2638 if (exception_code != EXCEPTION_BREAKPOINT) {
2639 report_error(t, exception_code, pc, exception_record,
2640 exceptionInfo->ContextRecord);
2641 }
2642 #endif
2643 return EXCEPTION_CONTINUE_SEARCH;
2644 }
2645
2646 #if defined(USE_VECTORED_EXCEPTION_HANDLING) || INCLUDE_AOT
2647 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2648 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2649 #if defined(_M_ARM64)
2650 address pc = (address) exceptionInfo->ContextRecord->Pc;
2651 #elif defined(_M_AMD64)
2652 address pc = (address) exceptionInfo->ContextRecord->Rip;
2653 #else
2654 address pc = (address) exceptionInfo->ContextRecord->Eip;
2655 #endif
2656
2657 // Fast path for code part of the code cache
2658 if (CodeCache::low_bound() <= pc && pc < CodeCache::high_bound()) {
2659 return topLevelExceptionFilter(exceptionInfo);
2660 }
2661
2662 // Handle the case where we get an implicit exception in AOT generated
2663 // code. AOT DLL's loaded are not registered for structured exceptions.
2664 // If the exception occurred in the codeCache or AOT code, pass control
2665 // to our normal exception handler.
2666 CodeBlob* cb = CodeCache::find_blob(pc);
2667 if (cb != NULL) {
2668 return topLevelExceptionFilter(exceptionInfo);
2669 }
2670
2671 return EXCEPTION_CONTINUE_SEARCH;
2672 }
2673 #endif
2674
2675 #if defined(USE_VECTORED_EXCEPTION_HANDLING)
2676 LONG WINAPI topLevelUnhandledExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2677 if (InterceptOSException) goto exit;
2678 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2679 #if defined(_M_ARM64)
2680 address pc = (address)exceptionInfo->ContextRecord->Pc;
2681 #elif defined(_M_AMD64)
2682 address pc = (address) exceptionInfo->ContextRecord->Rip;
2683 #else
2684 address pc = (address) exceptionInfo->ContextRecord->Eip;
2685 #endif
2686 Thread* t = Thread::current_or_null_safe();
2687
2688 if (exception_code != EXCEPTION_BREAKPOINT) {
2689 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2690 exceptionInfo->ContextRecord);
2691 }
2692 exit:
2693 return previousUnhandledExceptionFilter ? previousUnhandledExceptionFilter(exceptionInfo) : EXCEPTION_CONTINUE_SEARCH;
2694 }
2695 #endif
2696
2697 #ifndef _WIN64
2698 // Special care for fast JNI accessors.
2699 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2700 // the heap gets shrunk before the field access.
2701 // Need to install our own structured exception handler since native code may
2702 // install its own.
2703 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2704 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2705 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2706 address pc = (address) exceptionInfo->ContextRecord->Eip;
2707 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2708 if (addr != (address)-1) {
2709 return Handle_Exception(exceptionInfo, addr);
2710 }
2711 }
2712 return EXCEPTION_CONTINUE_SEARCH;
2713 }
2714
2715 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2716 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2717 jobject obj, \
2718 jfieldID fieldID) { \
2719 __try { \
2720 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2721 obj, \
2722 fieldID); \
2723 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2724 _exception_info())) { \
2725 } \
2726 return 0; \
2727 }
2728
2729 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2730 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2731 DEFINE_FAST_GETFIELD(jchar, char, Char)
2732 DEFINE_FAST_GETFIELD(jshort, short, Short)
2733 DEFINE_FAST_GETFIELD(jint, int, Int)
2734 DEFINE_FAST_GETFIELD(jlong, long, Long)
2735 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2736 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2737
2738 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2739 switch (type) {
2740 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2741 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2742 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2743 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2744 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2745 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2746 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2747 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2748 default: ShouldNotReachHere();
2749 }
2750 return (address)-1;
2751 }
2752 #endif
2753
2754 // Virtual Memory
2755
2756 int os::vm_page_size() { return os::win32::vm_page_size(); }
2757 int os::vm_allocation_granularity() {
2758 return os::win32::vm_allocation_granularity();
2759 }
2760
2761 // Windows large page support is available on Windows 2003. In order to use
2762 // large page memory, the administrator must first assign additional privilege
2763 // to the user:
2764 // + select Control Panel -> Administrative Tools -> Local Security Policy
2765 // + select Local Policies -> User Rights Assignment
2766 // + double click "Lock pages in memory", add users and/or groups
2767 // + reboot
2768 // Note the above steps are needed for administrator as well, as administrators
2769 // by default do not have the privilege to lock pages in memory.
2770 //
2771 // Note about Windows 2003: although the API supports committing large page
2772 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2773 // scenario, I found through experiment it only uses large page if the entire
2774 // memory region is reserved and committed in a single VirtualAlloc() call.
2775 // This makes Windows large page support more or less like Solaris ISM, in
2776 // that the entire heap must be committed upfront. This probably will change
2777 // in the future, if so the code below needs to be revisited.
2778
2779 #ifndef MEM_LARGE_PAGES
2780 #define MEM_LARGE_PAGES 0x20000000
2781 #endif
2782
2783 #define VirtualFreeChecked(mem, size, type) \
2784 do { \
2785 bool ret = VirtualFree(mem, size, type); \
2786 assert(ret, "Failed to free memory: " PTR_FORMAT, p2i(mem)); \
2787 } while (false)
2788
2789 // The number of bytes is setup to match 1 pixel and 32 bits per pixel.
2790 static const int gdi_tiny_bitmap_width_bytes = 4;
2791
2792 static HBITMAP gdi_create_tiny_bitmap(void* mem) {
2793 // The documentation for CreateBitmap states a word-alignment requirement.
2794 STATIC_ASSERT(is_aligned_(gdi_tiny_bitmap_width_bytes, sizeof(WORD)));
2795
2796 // Some callers use this function to test if memory crossing separate memory
2797 // reservations can be used. Create a height of 2 to make sure that one pixel
2798 // ends up in the first reservation and the other in the second.
2799 int nHeight = 2;
2800
2801 assert(is_aligned(mem, gdi_tiny_bitmap_width_bytes), "Incorrect alignment");
2802
2803 // Width is one pixel and correlates with gdi_tiny_bitmap_width_bytes.
2804 int nWidth = 1;
2805
2806 // Calculate bit count - will be 32.
2807 UINT nBitCount = gdi_tiny_bitmap_width_bytes / nWidth * BitsPerByte;
2808
2809 return CreateBitmap(
2810 nWidth,
2811 nHeight,
2812 1, // nPlanes
2813 nBitCount,
2814 mem); // lpBits
2815 }
2816
2817 // It has been found that some of the GDI functions fail under these two situations:
2818 // 1) When used with large pages
2819 // 2) When mem crosses the boundary between two separate memory reservations.
2820 //
2821 // This is a small test used to see if the current GDI implementation is
2822 // susceptible to any of these problems.
2823 static bool gdi_can_use_memory(void* mem) {
2824 HBITMAP bitmap = gdi_create_tiny_bitmap(mem);
2825 if (bitmap != NULL) {
2826 DeleteObject(bitmap);
2827 return true;
2828 }
2829
2830 // Verify that the bitmap could be created with a normal page.
2831 // If this fails, the testing method above isn't reliable.
2832 #ifdef ASSERT
2833 void* verify_mem = ::malloc(4 * 1024);
2834 HBITMAP verify_bitmap = gdi_create_tiny_bitmap(verify_mem);
2835 if (verify_bitmap == NULL) {
2836 fatal("Couldn't create test bitmap with malloced memory");
2837 } else {
2838 DeleteObject(verify_bitmap);
2839 }
2840 ::free(verify_mem);
2841 #endif
2842
2843 return false;
2844 }
2845
2846 // Test if GDI functions work when memory spans
2847 // two adjacent memory reservations.
2848 static bool gdi_can_use_split_reservation_memory(bool use_large_pages, size_t granule) {
2849 DWORD mem_large_pages = use_large_pages ? MEM_LARGE_PAGES : 0;
2850
2851 // Find virtual memory range. Two granules for regions and one for alignment.
2852 void* reserved = VirtualAlloc(NULL,
2853 granule * 3,
2854 MEM_RESERVE,
2855 PAGE_NOACCESS);
2856 if (reserved == NULL) {
2857 // Can't proceed with test - pessimistically report false
2858 return false;
2859 }
2860 VirtualFreeChecked(reserved, 0, MEM_RELEASE);
2861
2862 // Ensure proper alignment
2863 void* res0 = align_up(reserved, granule);
2864 void* res1 = (char*)res0 + granule;
2865
2866 // Reserve and commit the first part
2867 void* mem0 = VirtualAlloc(res0,
2868 granule,
2869 MEM_RESERVE|MEM_COMMIT|mem_large_pages,
2870 PAGE_READWRITE);
2871 if (mem0 != res0) {
2872 // Can't proceed with test - pessimistically report false
2873 return false;
2874 }
2875
2876 // Reserve and commit the second part
2877 void* mem1 = VirtualAlloc(res1,
2878 granule,
2879 MEM_RESERVE|MEM_COMMIT|mem_large_pages,
2880 PAGE_READWRITE);
2881 if (mem1 != res1) {
2882 VirtualFreeChecked(mem0, 0, MEM_RELEASE);
2883 // Can't proceed with test - pessimistically report false
2884 return false;
2885 }
2886
2887 // Set the bitmap's bits to point one "width" bytes before, so that
2888 // the bitmap extends across the reservation boundary.
2889 void* bitmapBits = (char*)mem1 - gdi_tiny_bitmap_width_bytes;
2890
2891 bool success = gdi_can_use_memory(bitmapBits);
2892
2893 VirtualFreeChecked(mem1, 0, MEM_RELEASE);
2894 VirtualFreeChecked(mem0, 0, MEM_RELEASE);
2895
2896 return success;
2897 }
2898
2899 // Container for NUMA node list info
2900 class NUMANodeListHolder {
2901 private:
2902 int *_numa_used_node_list; // allocated below
2903 int _numa_used_node_count;
2904
2905 void free_node_list() {
2906 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2907 }
2908
2909 public:
2910 NUMANodeListHolder() {
2911 _numa_used_node_count = 0;
2912 _numa_used_node_list = NULL;
2913 // do rest of initialization in build routine (after function pointers are set up)
2914 }
2915
2916 ~NUMANodeListHolder() {
2917 free_node_list();
2918 }
2919
2920 bool build() {
2921 DWORD_PTR proc_aff_mask;
2922 DWORD_PTR sys_aff_mask;
2923 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2924 ULONG highest_node_number;
2925 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2926 free_node_list();
2927 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2928 for (unsigned int i = 0; i <= highest_node_number; i++) {
2929 ULONGLONG proc_mask_numa_node;
2930 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2931 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2932 _numa_used_node_list[_numa_used_node_count++] = i;
2933 }
2934 }
2935 return (_numa_used_node_count > 1);
2936 }
2937
2938 int get_count() { return _numa_used_node_count; }
2939 int get_node_list_entry(int n) {
2940 // for indexes out of range, returns -1
2941 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2942 }
2943
2944 } numa_node_list_holder;
2945
2946 static size_t _large_page_size = 0;
2947
2948 static bool request_lock_memory_privilege() {
2949 HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2950 os::current_process_id());
2951
2952 bool success = false;
2953 HANDLE hToken = NULL;
2954 LUID luid;
2955 if (hProcess != NULL &&
2956 OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &hToken) &&
2957 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2958
2959 TOKEN_PRIVILEGES tp;
2960 tp.PrivilegeCount = 1;
2961 tp.Privileges[0].Luid = luid;
2962 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2963
2964 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2965 // privilege. Check GetLastError() too. See MSDN document.
2966 if (AdjustTokenPrivileges(hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2967 (GetLastError() == ERROR_SUCCESS)) {
2968 success = true;
2969 }
2970 }
2971
2972 // Cleanup
2973 if (hProcess != NULL) {
2974 CloseHandle(hProcess);
2975 }
2976 if (hToken != NULL) {
2977 CloseHandle(hToken);
2978 }
2979
2980 return success;
2981 }
2982
2983 static bool numa_interleaving_init() {
2984 bool success = false;
2985
2986 // print a warning if UseNUMAInterleaving flag is specified on command line
2987 bool warn_on_failure = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2988
2989 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2990
2991 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2992 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2993 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2994
2995 if (!numa_node_list_holder.build()) {
2996 WARN("Process does not cover multiple NUMA nodes.");
2997 WARN("...Ignoring UseNUMAInterleaving flag.");
2998 return false;
2999 }
3000
3001 if (!gdi_can_use_split_reservation_memory(UseLargePages, min_interleave_granularity)) {
3002 WARN("Windows GDI cannot handle split reservations.");
3003 WARN("...Ignoring UseNUMAInterleaving flag.");
3004 return false;
3005 }
3006
3007 if (log_is_enabled(Debug, os, cpu)) {
3008 Log(os, cpu) log;
3009 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
3010 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
3011 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
3012 }
3013 }
3014
3015 #undef WARN
3016
3017 return true;
3018 }
3019
3020 // this routine is used whenever we need to reserve a contiguous VA range
3021 // but we need to make separate VirtualAlloc calls for each piece of the range
3022 // Reasons for doing this:
3023 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
3024 // * UseNUMAInterleaving requires a separate node for each piece
3025 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
3026 DWORD prot,
3027 bool should_inject_error = false) {
3028 char * p_buf;
3029 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
3030 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
3031 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
3032
3033 // first reserve enough address space in advance since we want to be
3034 // able to break a single contiguous virtual address range into multiple
3035 // large page commits but WS2003 does not allow reserving large page space
3036 // so we just use 4K pages for reserve, this gives us a legal contiguous
3037 // address space. then we will deallocate that reservation, and re alloc
3038 // using large pages
3039 const size_t size_of_reserve = bytes + chunk_size;
3040 if (bytes > size_of_reserve) {
3041 // Overflowed.
3042 return NULL;
3043 }
3044 p_buf = (char *) VirtualAlloc(addr,
3045 size_of_reserve, // size of Reserve
3046 MEM_RESERVE,
3047 PAGE_READWRITE);
3048 // If reservation failed, return NULL
3049 if (p_buf == NULL) return NULL;
3050 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
3051 os::release_memory(p_buf, bytes + chunk_size);
3052
3053 // we still need to round up to a page boundary (in case we are using large pages)
3054 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
3055 // instead we handle this in the bytes_to_rq computation below
3056 p_buf = align_up(p_buf, page_size);
3057
3058 // now go through and allocate one chunk at a time until all bytes are
3059 // allocated
3060 size_t bytes_remaining = bytes;
3061 // An overflow of align_up() would have been caught above
3062 // in the calculation of size_of_reserve.
3063 char * next_alloc_addr = p_buf;
3064 HANDLE hProc = GetCurrentProcess();
3065
3066 #ifdef ASSERT
3067 // Variable for the failure injection
3068 int ran_num = os::random();
3069 size_t fail_after = ran_num % bytes;
3070 #endif
3071
3072 int count=0;
3073 while (bytes_remaining) {
3074 // select bytes_to_rq to get to the next chunk_size boundary
3075
3076 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3077 // Note allocate and commit
3078 char * p_new;
3079
3080 #ifdef ASSERT
3081 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3082 #else
3083 const bool inject_error_now = false;
3084 #endif
3085
3086 if (inject_error_now) {
3087 p_new = NULL;
3088 } else {
3089 if (!UseNUMAInterleaving) {
3090 p_new = (char *) VirtualAlloc(next_alloc_addr,
3091 bytes_to_rq,
3092 flags,
3093 prot);
3094 } else {
3095 // get the next node to use from the used_node_list
3096 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3097 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3098 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3099 }
3100 }
3101
3102 if (p_new == NULL) {
3103 // Free any allocated pages
3104 if (next_alloc_addr > p_buf) {
3105 // Some memory was committed so release it.
3106 size_t bytes_to_release = bytes - bytes_remaining;
3107 // NMT has yet to record any individual blocks, so it
3108 // need to create a dummy 'reserve' record to match
3109 // the release.
3110 MemTracker::record_virtual_memory_reserve((address)p_buf,
3111 bytes_to_release, CALLER_PC);
3112 os::release_memory(p_buf, bytes_to_release);
3113 }
3114 #ifdef ASSERT
3115 if (should_inject_error) {
3116 log_develop_debug(pagesize)("Reserving pages individually failed.");
3117 }
3118 #endif
3119 return NULL;
3120 }
3121
3122 bytes_remaining -= bytes_to_rq;
3123 next_alloc_addr += bytes_to_rq;
3124 count++;
3125 }
3126 // Although the memory is allocated individually, it is returned as one.
3127 // NMT records it as one block.
3128 if ((flags & MEM_COMMIT) != 0) {
3129 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3130 } else {
3131 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3132 }
3133
3134 // made it this far, success
3135 return p_buf;
3136 }
3137
3138 static size_t large_page_init_decide_size() {
3139 // print a warning if any large page related flag is specified on command line
3140 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3141 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3142
3143 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3144
3145 if (!request_lock_memory_privilege()) {
3146 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3147 return 0;
3148 }
3149
3150 size_t size = GetLargePageMinimum();
3151 if (size == 0) {
3152 WARN("Large page is not supported by the processor.");
3153 return 0;
3154 }
3155
3156 #if defined(IA32) || defined(AMD64)
3157 if (size > 4*M || LargePageSizeInBytes > 4*M) {
3158 WARN("JVM cannot use large pages bigger than 4mb.");
3159 return 0;
3160 }
3161 #endif
3162
3163 if (LargePageSizeInBytes > 0 && LargePageSizeInBytes % size == 0) {
3164 size = LargePageSizeInBytes;
3165 }
3166
3167 // Now test allocating a page
3168 void* large_page = VirtualAlloc(NULL,
3169 size,
3170 MEM_RESERVE|MEM_COMMIT|MEM_LARGE_PAGES,
3171 PAGE_READWRITE);
3172 if (large_page == NULL) {
3173 WARN("JVM cannot allocate one single large page.");
3174 return 0;
3175 }
3176
3177 // Detect if GDI can use memory backed by large pages
3178 if (!gdi_can_use_memory(large_page)) {
3179 WARN("JVM cannot use large pages because of bug in Windows GDI.");
3180 return 0;
3181 }
3182
3183 // Release test page
3184 VirtualFreeChecked(large_page, 0, MEM_RELEASE);
3185
3186 #undef WARN
3187
3188 return size;
3189 }
3190
3191 void os::large_page_init() {
3192 if (!UseLargePages) {
3193 return;
3194 }
3195
3196 _large_page_size = large_page_init_decide_size();
3197
3198 const size_t default_page_size = (size_t) vm_page_size();
3199 if (_large_page_size > default_page_size) {
3200 _page_sizes[0] = _large_page_size;
3201 _page_sizes[1] = default_page_size;
3202 _page_sizes[2] = 0;
3203 }
3204
3205 UseLargePages = _large_page_size != 0;
3206
3207 if (UseLargePages && UseLargePagesIndividualAllocation) {
3208 if (!gdi_can_use_split_reservation_memory(true /* use_large_pages */, _large_page_size)) {
3209 if (FLAG_IS_CMDLINE(UseLargePagesIndividualAllocation)) {
3210 warning("Windows GDI cannot handle split reservations.");
3211 warning("...Ignoring UseLargePagesIndividualAllocation flag.");
3212 }
3213 UseLargePagesIndividualAllocation = false;
3214 }
3215 }
3216 }
3217
3218 int os::create_file_for_heap(const char* dir) {
3219
3220 const char name_template[] = "/jvmheap.XXXXXX";
3221
3222 size_t fullname_len = strlen(dir) + strlen(name_template);
3223 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3224 if (fullname == NULL) {
3225 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3226 return -1;
3227 }
3228 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3229 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3230
3231 os::native_path(fullname);
3232
3233 char *path = _mktemp(fullname);
3234 if (path == NULL) {
3235 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3236 os::free(fullname);
3237 return -1;
3238 }
3239
3240 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3241
3242 os::free(fullname);
3243 if (fd < 0) {
3244 warning("Problem opening file for heap (%s)", os::strerror(errno));
3245 return -1;
3246 }
3247 return fd;
3248 }
3249
3250 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3251 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3252 assert(fd != -1, "File descriptor is not valid");
3253
3254 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3255 #ifdef _LP64
3256 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3257 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3258 #else
3259 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3260 0, (DWORD)size, NULL);
3261 #endif
3262 if (fileMapping == NULL) {
3263 if (GetLastError() == ERROR_DISK_FULL) {
3264 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3265 }
3266 else {
3267 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3268 }
3269
3270 return NULL;
3271 }
3272
3273 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3274
3275 CloseHandle(fileMapping);
3276
3277 return (char*)addr;
3278 }
3279
3280 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3281 assert(fd != -1, "File descriptor is not valid");
3282 assert(base != NULL, "Base address cannot be NULL");
3283
3284 release_memory(base, size);
3285 return map_memory_to_file(base, size, fd);
3286 }
3287
3288 // On win32, one cannot release just a part of reserved memory, it's an
3289 // all or nothing deal. When we split a reservation, we must break the
3290 // reservation into two reservations.
3291 void os::split_reserved_memory(char *base, size_t size, size_t split) {
3292
3293 char* const split_address = base + split;
3294 assert(size > 0, "Sanity");
3295 assert(size > split, "Sanity");
3296 assert(split > 0, "Sanity");
3297 assert(is_aligned(base, os::vm_allocation_granularity()), "Sanity");
3298 assert(is_aligned(split_address, os::vm_allocation_granularity()), "Sanity");
3299
3300 release_memory(base, size);
3301 reserve_memory(split, base);
3302 reserve_memory(size - split, split_address);
3303
3304 // NMT: nothing to do here. Since Windows implements the split by
3305 // releasing and re-reserving memory, the parts are already registered
3306 // as individual mappings with NMT.
3307
3308 }
3309
3310 // Multiple threads can race in this code but it's not possible to unmap small sections of
3311 // virtual space to get requested alignment, like posix-like os's.
3312 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3313 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3314 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3315 "Alignment must be a multiple of allocation granularity (page size)");
3316 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3317
3318 size_t extra_size = size + alignment;
3319 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3320
3321 char* aligned_base = NULL;
3322
3323 do {
3324 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3325 if (extra_base == NULL) {
3326 return NULL;
3327 }
3328 // Do manual alignment
3329 aligned_base = align_up(extra_base, alignment);
3330
3331 if (file_desc != -1) {
3332 os::unmap_memory(extra_base, extra_size);
3333 } else {
3334 os::release_memory(extra_base, extra_size);
3335 }
3336
3337 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3338
3339 } while (aligned_base == NULL);
3340
3341 return aligned_base;
3342 }
3343
3344 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3345 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3346 "reserve alignment");
3347 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3348 char* res;
3349 // note that if UseLargePages is on, all the areas that require interleaving
3350 // will go thru reserve_memory_special rather than thru here.
3351 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3352 if (!use_individual) {
3353 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3354 } else {
3355 elapsedTimer reserveTimer;
3356 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3357 // in numa interleaving, we have to allocate pages individually
3358 // (well really chunks of NUMAInterleaveGranularity size)
3359 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3360 if (res == NULL) {
3361 warning("NUMA page allocation failed");
3362 }
3363 if (Verbose && PrintMiscellaneous) {
3364 reserveTimer.stop();
3365 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3366 reserveTimer.milliseconds(), reserveTimer.ticks());
3367 }
3368 }
3369 assert(res == NULL || addr == NULL || addr == res,
3370 "Unexpected address from reserve.");
3371
3372 return res;
3373 }
3374
3375 // Reserve memory at an arbitrary address, only if that area is
3376 // available (and not reserved for something else).
3377 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3378 // Windows os::reserve_memory() fails of the requested address range is
3379 // not avilable.
3380 return reserve_memory(bytes, requested_addr);
3381 }
3382
3383 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3384 assert(file_desc >= 0, "file_desc is not valid");
3385 return map_memory_to_file(requested_addr, bytes, file_desc);
3386 }
3387
3388 size_t os::large_page_size() {
3389 return _large_page_size;
3390 }
3391
3392 bool os::can_commit_large_page_memory() {
3393 // Windows only uses large page memory when the entire region is reserved
3394 // and committed in a single VirtualAlloc() call. This may change in the
3395 // future, but with Windows 2003 it's not possible to commit on demand.
3396 return false;
3397 }
3398
3399 bool os::can_execute_large_page_memory() {
3400 return true;
3401 }
3402
3403 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3404 bool exec) {
3405 assert(UseLargePages, "only for large pages");
3406
3407 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3408 return NULL; // Fallback to small pages.
3409 }
3410
3411 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3412 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3413
3414 // with large pages, there are two cases where we need to use Individual Allocation
3415 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3416 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3417 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3418 log_debug(pagesize)("Reserving large pages individually.");
3419
3420 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3421 if (p_buf == NULL) {
3422 // give an appropriate warning message
3423 if (UseNUMAInterleaving) {
3424 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3425 }
3426 if (UseLargePagesIndividualAllocation) {
3427 warning("Individually allocated large pages failed, "
3428 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3429 }
3430 return NULL;
3431 }
3432
3433 return p_buf;
3434
3435 } else {
3436 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3437
3438 // normal policy just allocate it all at once
3439 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3440 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3441
3442 return res;
3443 }
3444 }
3445
3446 bool os::pd_release_memory_special(char* base, size_t bytes) {
3447 assert(base != NULL, "Sanity check");
3448 return pd_release_memory(base, bytes);
3449 }
3450
3451 void os::print_statistics() {
3452 }
3453
3454 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3455 int err = os::get_last_error();
3456 char buf[256];
3457 size_t buf_len = os::lasterror(buf, sizeof(buf));
3458 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3459 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3460 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3461 }
3462
3463 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3464 if (bytes == 0) {
3465 // Don't bother the OS with noops.
3466 return true;
3467 }
3468 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3469 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3470 // Don't attempt to print anything if the OS call fails. We're
3471 // probably low on resources, so the print itself may cause crashes.
3472
3473 // unless we have NUMAInterleaving enabled, the range of a commit
3474 // is always within a reserve covered by a single VirtualAlloc
3475 // in that case we can just do a single commit for the requested size
3476 if (!UseNUMAInterleaving) {
3477 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3478 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3479 return false;
3480 }
3481 if (exec) {
3482 DWORD oldprot;
3483 // Windows doc says to use VirtualProtect to get execute permissions
3484 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3485 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3486 return false;
3487 }
3488 }
3489 return true;
3490 } else {
3491
3492 // when NUMAInterleaving is enabled, the commit might cover a range that
3493 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3494 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3495 // returns represents the number of bytes that can be committed in one step.
3496 size_t bytes_remaining = bytes;
3497 char * next_alloc_addr = addr;
3498 while (bytes_remaining > 0) {
3499 MEMORY_BASIC_INFORMATION alloc_info;
3500 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3501 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3502 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3503 PAGE_READWRITE) == NULL) {
3504 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3505 exec);)
3506 return false;
3507 }
3508 if (exec) {
3509 DWORD oldprot;
3510 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3511 PAGE_EXECUTE_READWRITE, &oldprot)) {
3512 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3513 exec);)
3514 return false;
3515 }
3516 }
3517 bytes_remaining -= bytes_to_rq;
3518 next_alloc_addr += bytes_to_rq;
3519 }
3520 }
3521 // if we made it this far, return true
3522 return true;
3523 }
3524
3525 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3526 bool exec) {
3527 // alignment_hint is ignored on this OS
3528 return pd_commit_memory(addr, size, exec);
3529 }
3530
3531 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3532 const char* mesg) {
3533 assert(mesg != NULL, "mesg must be specified");
3534 if (!pd_commit_memory(addr, size, exec)) {
3535 warn_fail_commit_memory(addr, size, exec);
3536 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3537 }
3538 }
3539
3540 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3541 size_t alignment_hint, bool exec,
3542 const char* mesg) {
3543 // alignment_hint is ignored on this OS
3544 pd_commit_memory_or_exit(addr, size, exec, mesg);
3545 }
3546
3547 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3548 if (bytes == 0) {
3549 // Don't bother the OS with noops.
3550 return true;
3551 }
3552 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3553 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3554 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3555 }
3556
3557 bool os::pd_release_memory(char* addr, size_t bytes) {
3558 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3559 }
3560
3561 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3562 return os::commit_memory(addr, size, !ExecMem);
3563 }
3564
3565 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3566 return os::uncommit_memory(addr, size);
3567 }
3568
3569 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3570 uint count = 0;
3571 bool ret = false;
3572 size_t bytes_remaining = bytes;
3573 char * next_protect_addr = addr;
3574
3575 // Use VirtualQuery() to get the chunk size.
3576 while (bytes_remaining) {
3577 MEMORY_BASIC_INFORMATION alloc_info;
3578 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3579 return false;
3580 }
3581
3582 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3583 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3584 // but we don't distinguish here as both cases are protected by same API.
3585 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3586 warning("Failed protecting pages individually for chunk #%u", count);
3587 if (!ret) {
3588 return false;
3589 }
3590
3591 bytes_remaining -= bytes_to_protect;
3592 next_protect_addr += bytes_to_protect;
3593 count++;
3594 }
3595 return ret;
3596 }
3597
3598 // Set protections specified
3599 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3600 bool is_committed) {
3601 unsigned int p = 0;
3602 switch (prot) {
3603 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3604 case MEM_PROT_READ: p = PAGE_READONLY; break;
3605 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3606 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3607 default:
3608 ShouldNotReachHere();
3609 }
3610
3611 DWORD old_status;
3612
3613 // Strange enough, but on Win32 one can change protection only for committed
3614 // memory, not a big deal anyway, as bytes less or equal than 64K
3615 if (!is_committed) {
3616 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3617 "cannot commit protection page");
3618 }
3619 // One cannot use os::guard_memory() here, as on Win32 guard page
3620 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3621 //
3622 // Pages in the region become guard pages. Any attempt to access a guard page
3623 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3624 // the guard page status. Guard pages thus act as a one-time access alarm.
3625 bool ret;
3626 if (UseNUMAInterleaving) {
3627 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3628 // so we must protect the chunks individually.
3629 ret = protect_pages_individually(addr, bytes, p, &old_status);
3630 } else {
3631 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3632 }
3633 #ifdef ASSERT
3634 if (!ret) {
3635 int err = os::get_last_error();
3636 char buf[256];
3637 size_t buf_len = os::lasterror(buf, sizeof(buf));
3638 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3639 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3640 buf_len != 0 ? buf : "<no_error_string>", err);
3641 }
3642 #endif
3643 return ret;
3644 }
3645
3646 bool os::guard_memory(char* addr, size_t bytes) {
3647 DWORD old_status;
3648 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3649 }
3650
3651 bool os::unguard_memory(char* addr, size_t bytes) {
3652 DWORD old_status;
3653 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3654 }
3655
3656 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3657 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3658 void os::numa_make_global(char *addr, size_t bytes) { }
3659 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3660 bool os::numa_topology_changed() { return false; }
3661 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3662 int os::numa_get_group_id() { return 0; }
3663 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3664 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3665 // Provide an answer for UMA systems
3666 ids[0] = 0;
3667 return 1;
3668 } else {
3669 // check for size bigger than actual groups_num
3670 size = MIN2(size, numa_get_groups_num());
3671 for (int i = 0; i < (int)size; i++) {
3672 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3673 }
3674 return size;
3675 }
3676 }
3677
3678 int os::numa_get_group_id_for_address(const void* address) {
3679 return 0;
3680 }
3681
3682 bool os::get_page_info(char *start, page_info* info) {
3683 return false;
3684 }
3685
3686 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3687 page_info* page_found) {
3688 return end;
3689 }
3690
3691 char* os::non_memory_address_word() {
3692 // Must never look like an address returned by reserve_memory,
3693 // even in its subfields (as defined by the CPU immediate fields,
3694 // if the CPU splits constants across multiple instructions).
3695 #ifdef _M_ARM64
3696 // AArch64 has a maximum addressable space of 48-bits
3697 return (char*)((1ull << 48) - 1);
3698 #else
3699 return (char*)-1;
3700 #endif
3701 }
3702
3703 #define MAX_ERROR_COUNT 100
3704 #define SYS_THREAD_ERROR 0xffffffffUL
3705
3706 void os::pd_start_thread(Thread* thread) {
3707 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3708 // Returns previous suspend state:
3709 // 0: Thread was not suspended
3710 // 1: Thread is running now
3711 // >1: Thread is still suspended.
3712 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3713 }
3714
3715
3716 // Short sleep, direct OS call.
3717 //
3718 // ms = 0, means allow others (if any) to run.
3719 //
3720 void os::naked_short_sleep(jlong ms) {
3721 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3722 Sleep(ms);
3723 }
3724
3725 // Windows does not provide sleep functionality with nanosecond resolution, so we
3726 // try to approximate this with spinning combined with yielding if another thread
3727 // is ready to run on the current processor.
3728 void os::naked_short_nanosleep(jlong ns) {
3729 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3730
3731 int64_t start = os::javaTimeNanos();
3732 do {
3733 if (SwitchToThread() == 0) {
3734 // Nothing else is ready to run on this cpu, spin a little
3735 SpinPause();
3736 }
3737 } while (os::javaTimeNanos() - start < ns);
3738 }
3739
3740 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3741 void os::infinite_sleep() {
3742 while (true) { // sleep forever ...
3743 Sleep(100000); // ... 100 seconds at a time
3744 }
3745 }
3746
3747 typedef BOOL (WINAPI * STTSignature)(void);
3748
3749 void os::naked_yield() {
3750 // Consider passing back the return value from SwitchToThread().
3751 SwitchToThread();
3752 }
3753
3754 // Win32 only gives you access to seven real priorities at a time,
3755 // so we compress Java's ten down to seven. It would be better
3756 // if we dynamically adjusted relative priorities.
3757
3758 int os::java_to_os_priority[CriticalPriority + 1] = {
3759 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3760 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3761 THREAD_PRIORITY_LOWEST, // 2
3762 THREAD_PRIORITY_BELOW_NORMAL, // 3
3763 THREAD_PRIORITY_BELOW_NORMAL, // 4
3764 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3765 THREAD_PRIORITY_NORMAL, // 6
3766 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3767 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3768 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3769 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3770 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3771 };
3772
3773 int prio_policy1[CriticalPriority + 1] = {
3774 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3775 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3776 THREAD_PRIORITY_LOWEST, // 2
3777 THREAD_PRIORITY_BELOW_NORMAL, // 3
3778 THREAD_PRIORITY_BELOW_NORMAL, // 4
3779 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3780 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3781 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3782 THREAD_PRIORITY_HIGHEST, // 8
3783 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3784 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3785 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3786 };
3787
3788 static int prio_init() {
3789 // If ThreadPriorityPolicy is 1, switch tables
3790 if (ThreadPriorityPolicy == 1) {
3791 int i;
3792 for (i = 0; i < CriticalPriority + 1; i++) {
3793 os::java_to_os_priority[i] = prio_policy1[i];
3794 }
3795 }
3796 if (UseCriticalJavaThreadPriority) {
3797 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3798 }
3799 return 0;
3800 }
3801
3802 OSReturn os::set_native_priority(Thread* thread, int priority) {
3803 if (!UseThreadPriorities) return OS_OK;
3804 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3805 return ret ? OS_OK : OS_ERR;
3806 }
3807
3808 OSReturn os::get_native_priority(const Thread* const thread,
3809 int* priority_ptr) {
3810 if (!UseThreadPriorities) {
3811 *priority_ptr = java_to_os_priority[NormPriority];
3812 return OS_OK;
3813 }
3814 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3815 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3816 assert(false, "GetThreadPriority failed");
3817 return OS_ERR;
3818 }
3819 *priority_ptr = os_prio;
3820 return OS_OK;
3821 }
3822
3823 // GetCurrentThreadId() returns DWORD
3824 intx os::current_thread_id() { return GetCurrentThreadId(); }
3825
3826 static int _initial_pid = 0;
3827
3828 int os::current_process_id() {
3829 return (_initial_pid ? _initial_pid : _getpid());
3830 }
3831
3832 int os::win32::_vm_page_size = 0;
3833 int os::win32::_vm_allocation_granularity = 0;
3834 int os::win32::_processor_type = 0;
3835 // Processor level is not available on non-NT systems, use vm_version instead
3836 int os::win32::_processor_level = 0;
3837 julong os::win32::_physical_memory = 0;
3838 size_t os::win32::_default_stack_size = 0;
3839
3840 intx os::win32::_os_thread_limit = 0;
3841 volatile intx os::win32::_os_thread_count = 0;
3842
3843 bool os::win32::_is_windows_server = false;
3844
3845 // 6573254
3846 // Currently, the bug is observed across all the supported Windows releases,
3847 // including the latest one (as of this writing - Windows Server 2012 R2)
3848 bool os::win32::_has_exit_bug = true;
3849
3850 void os::win32::initialize_system_info() {
3851 SYSTEM_INFO si;
3852 GetSystemInfo(&si);
3853 _vm_page_size = si.dwPageSize;
3854 _vm_allocation_granularity = si.dwAllocationGranularity;
3855 _processor_type = si.dwProcessorType;
3856 _processor_level = si.wProcessorLevel;
3857 set_processor_count(si.dwNumberOfProcessors);
3858
3859 MEMORYSTATUSEX ms;
3860 ms.dwLength = sizeof(ms);
3861
3862 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3863 // dwMemoryLoad (% of memory in use)
3864 GlobalMemoryStatusEx(&ms);
3865 _physical_memory = ms.ullTotalPhys;
3866
3867 if (FLAG_IS_DEFAULT(MaxRAM)) {
3868 // Adjust MaxRAM according to the maximum virtual address space available.
3869 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3870 }
3871
3872 OSVERSIONINFOEX oi;
3873 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3874 GetVersionEx((OSVERSIONINFO*)&oi);
3875 switch (oi.dwPlatformId) {
3876 case VER_PLATFORM_WIN32_NT:
3877 {
3878 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3879 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3880 oi.wProductType == VER_NT_SERVER) {
3881 _is_windows_server = true;
3882 }
3883 }
3884 break;
3885 default: fatal("Unknown platform");
3886 }
3887
3888 _default_stack_size = os::current_stack_size();
3889 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3890 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3891 "stack size not a multiple of page size");
3892
3893 initialize_performance_counter();
3894 }
3895
3896 int os::win32::get_cacheline_size() {
3897 PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
3898 DWORD returnLength = 0;
3899
3900 // See https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getlogicalprocessorinformation
3901
3902 GetLogicalProcessorInformation(NULL, &returnLength);
3903 assert(GetLastError() == ERROR_INSUFFICIENT_BUFFER, "Unexpected return from GetLogicalProcessorInformation");
3904
3905 buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)os::malloc(returnLength, mtInternal);
3906 BOOL rc = GetLogicalProcessorInformation(buffer, &returnLength);
3907 assert(rc, "Unexpected return from GetLogicalProcessorInformation");
3908
3909 int line_sz = -1;
3910 for (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = buffer; ptr < buffer + returnLength / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); ptr++) {
3911 switch (ptr->Relationship) {
3912 case RelationCache:
3913 // Cache data is in ptr->Cache, one CACHE_DESCRIPTOR structure for each cache.
3914 PCACHE_DESCRIPTOR Cache = &ptr->Cache;
3915 if (Cache->Level == 1) {
3916 line_sz = Cache->LineSize;
3917 }
3918 break;
3919 }
3920 }
3921 os::free(buffer);
3922 return line_sz;
3923 }
3924
3925 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3926 int ebuflen) {
3927 char path[MAX_PATH];
3928 DWORD size;
3929 DWORD pathLen = (DWORD)sizeof(path);
3930 HINSTANCE result = NULL;
3931
3932 // only allow library name without path component
3933 assert(strchr(name, '\\') == NULL, "path not allowed");
3934 assert(strchr(name, ':') == NULL, "path not allowed");
3935 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3936 jio_snprintf(ebuf, ebuflen,
3937 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3938 return NULL;
3939 }
3940
3941 // search system directory
3942 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3943 if (size >= pathLen) {
3944 return NULL; // truncated
3945 }
3946 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3947 return NULL; // truncated
3948 }
3949 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3950 return result;
3951 }
3952 }
3953
3954 // try Windows directory
3955 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3956 if (size >= pathLen) {
3957 return NULL; // truncated
3958 }
3959 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3960 return NULL; // truncated
3961 }
3962 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3963 return result;
3964 }
3965 }
3966
3967 jio_snprintf(ebuf, ebuflen,
3968 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3969 return NULL;
3970 }
3971
3972 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3973 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3974
3975 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3976 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3977 return TRUE;
3978 }
3979
3980 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3981 // Basic approach:
3982 // - Each exiting thread registers its intent to exit and then does so.
3983 // - A thread trying to terminate the process must wait for all
3984 // threads currently exiting to complete their exit.
3985
3986 if (os::win32::has_exit_bug()) {
3987 // The array holds handles of the threads that have started exiting by calling
3988 // _endthreadex().
3989 // Should be large enough to avoid blocking the exiting thread due to lack of
3990 // a free slot.
3991 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3992 static int handle_count = 0;
3993
3994 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3995 static CRITICAL_SECTION crit_sect;
3996 static volatile DWORD process_exiting = 0;
3997 int i, j;
3998 DWORD res;
3999 HANDLE hproc, hthr;
4000
4001 // We only attempt to register threads until a process exiting
4002 // thread manages to set the process_exiting flag. Any threads
4003 // that come through here after the process_exiting flag is set
4004 // are unregistered and will be caught in the SuspendThread()
4005 // infinite loop below.
4006 bool registered = false;
4007
4008 // The first thread that reached this point, initializes the critical section.
4009 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
4010 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
4011 } else if (Atomic::load_acquire(&process_exiting) == 0) {
4012 if (what != EPT_THREAD) {
4013 // Atomically set process_exiting before the critical section
4014 // to increase the visibility between racing threads.
4015 Atomic::cmpxchg(&process_exiting, (DWORD)0, GetCurrentThreadId());
4016 }
4017 EnterCriticalSection(&crit_sect);
4018
4019 if (what == EPT_THREAD && Atomic::load_acquire(&process_exiting) == 0) {
4020 // Remove from the array those handles of the threads that have completed exiting.
4021 for (i = 0, j = 0; i < handle_count; ++i) {
4022 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
4023 if (res == WAIT_TIMEOUT) {
4024 handles[j++] = handles[i];
4025 } else {
4026 if (res == WAIT_FAILED) {
4027 warning("WaitForSingleObject failed (%u) in %s: %d\n",
4028 GetLastError(), __FILE__, __LINE__);
4029 }
4030 // Don't keep the handle, if we failed waiting for it.
4031 CloseHandle(handles[i]);
4032 }
4033 }
4034
4035 // If there's no free slot in the array of the kept handles, we'll have to
4036 // wait until at least one thread completes exiting.
4037 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
4038 // Raise the priority of the oldest exiting thread to increase its chances
4039 // to complete sooner.
4040 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
4041 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
4042 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
4043 i = (res - WAIT_OBJECT_0);
4044 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
4045 for (; i < handle_count; ++i) {
4046 handles[i] = handles[i + 1];
4047 }
4048 } else {
4049 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4050 (res == WAIT_FAILED ? "failed" : "timed out"),
4051 GetLastError(), __FILE__, __LINE__);
4052 // Don't keep handles, if we failed waiting for them.
4053 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
4054 CloseHandle(handles[i]);
4055 }
4056 handle_count = 0;
4057 }
4058 }
4059
4060 // Store a duplicate of the current thread handle in the array of handles.
4061 hproc = GetCurrentProcess();
4062 hthr = GetCurrentThread();
4063 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
4064 0, FALSE, DUPLICATE_SAME_ACCESS)) {
4065 warning("DuplicateHandle failed (%u) in %s: %d\n",
4066 GetLastError(), __FILE__, __LINE__);
4067
4068 // We can't register this thread (no more handles) so this thread
4069 // may be racing with a thread that is calling exit(). If the thread
4070 // that is calling exit() has managed to set the process_exiting
4071 // flag, then this thread will be caught in the SuspendThread()
4072 // infinite loop below which closes that race. A small timing
4073 // window remains before the process_exiting flag is set, but it
4074 // is only exposed when we are out of handles.
4075 } else {
4076 ++handle_count;
4077 registered = true;
4078
4079 // The current exiting thread has stored its handle in the array, and now
4080 // should leave the critical section before calling _endthreadex().
4081 }
4082
4083 } else if (what != EPT_THREAD && handle_count > 0) {
4084 jlong start_time, finish_time, timeout_left;
4085 // Before ending the process, make sure all the threads that had called
4086 // _endthreadex() completed.
4087
4088 // Set the priority level of the current thread to the same value as
4089 // the priority level of exiting threads.
4090 // This is to ensure it will be given a fair chance to execute if
4091 // the timeout expires.
4092 hthr = GetCurrentThread();
4093 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
4094 start_time = os::javaTimeNanos();
4095 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
4096 for (i = 0; ; ) {
4097 int portion_count = handle_count - i;
4098 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
4099 portion_count = MAXIMUM_WAIT_OBJECTS;
4100 }
4101 for (j = 0; j < portion_count; ++j) {
4102 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4103 }
4104 timeout_left = (finish_time - start_time) / 1000000L;
4105 if (timeout_left < 0) {
4106 timeout_left = 0;
4107 }
4108 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4109 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4110 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4111 (res == WAIT_FAILED ? "failed" : "timed out"),
4112 GetLastError(), __FILE__, __LINE__);
4113 // Reset portion_count so we close the remaining
4114 // handles due to this error.
4115 portion_count = handle_count - i;
4116 }
4117 for (j = 0; j < portion_count; ++j) {
4118 CloseHandle(handles[i + j]);
4119 }
4120 if ((i += portion_count) >= handle_count) {
4121 break;
4122 }
4123 start_time = os::javaTimeNanos();
4124 }
4125 handle_count = 0;
4126 }
4127
4128 LeaveCriticalSection(&crit_sect);
4129 }
4130
4131 if (!registered &&
4132 Atomic::load_acquire(&process_exiting) != 0 &&
4133 process_exiting != GetCurrentThreadId()) {
4134 // Some other thread is about to call exit(), so we don't let
4135 // the current unregistered thread proceed to exit() or _endthreadex()
4136 while (true) {
4137 SuspendThread(GetCurrentThread());
4138 // Avoid busy-wait loop, if SuspendThread() failed.
4139 Sleep(EXIT_TIMEOUT);
4140 }
4141 }
4142 }
4143
4144 // We are here if either
4145 // - there's no 'race at exit' bug on this OS release;
4146 // - initialization of the critical section failed (unlikely);
4147 // - the current thread has registered itself and left the critical section;
4148 // - the process-exiting thread has raised the flag and left the critical section.
4149 if (what == EPT_THREAD) {
4150 _endthreadex((unsigned)exit_code);
4151 } else if (what == EPT_PROCESS) {
4152 ::exit(exit_code);
4153 } else {
4154 _exit(exit_code);
4155 }
4156
4157 // Should not reach here
4158 return exit_code;
4159 }
4160
4161 #undef EXIT_TIMEOUT
4162
4163 void os::win32::setmode_streams() {
4164 _setmode(_fileno(stdin), _O_BINARY);
4165 _setmode(_fileno(stdout), _O_BINARY);
4166 _setmode(_fileno(stderr), _O_BINARY);
4167 }
4168
4169 void os::wait_for_keypress_at_exit(void) {
4170 if (PauseAtExit) {
4171 fprintf(stderr, "Press any key to continue...\n");
4172 fgetc(stdin);
4173 }
4174 }
4175
4176
4177 bool os::message_box(const char* title, const char* message) {
4178 int result = MessageBox(NULL, message, title,
4179 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4180 return result == IDYES;
4181 }
4182
4183 #ifndef PRODUCT
4184 #ifndef _WIN64
4185 // Helpers to check whether NX protection is enabled
4186 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4187 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4188 pex->ExceptionRecord->NumberParameters > 0 &&
4189 pex->ExceptionRecord->ExceptionInformation[0] ==
4190 EXCEPTION_INFO_EXEC_VIOLATION) {
4191 return EXCEPTION_EXECUTE_HANDLER;
4192 }
4193 return EXCEPTION_CONTINUE_SEARCH;
4194 }
4195
4196 void nx_check_protection() {
4197 // If NX is enabled we'll get an exception calling into code on the stack
4198 char code[] = { (char)0xC3 }; // ret
4199 void *code_ptr = (void *)code;
4200 __try {
4201 __asm call code_ptr
4202 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4203 tty->print_raw_cr("NX protection detected.");
4204 }
4205 }
4206 #endif // _WIN64
4207 #endif // PRODUCT
4208
4209 // This is called _before_ the global arguments have been parsed
4210 void os::init(void) {
4211 _initial_pid = _getpid();
4212
4213 init_random(1234567);
4214
4215 win32::initialize_system_info();
4216 win32::setmode_streams();
4217 init_page_sizes((size_t) win32::vm_page_size());
4218
4219 // This may be overridden later when argument processing is done.
4220 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
4221
4222 // Initialize main_process and main_thread
4223 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4224 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4225 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4226 fatal("DuplicateHandle failed\n");
4227 }
4228 main_thread_id = (int) GetCurrentThreadId();
4229
4230 // initialize fast thread access - only used for 32-bit
4231 win32::initialize_thread_ptr_offset();
4232 }
4233
4234 // To install functions for atexit processing
4235 extern "C" {
4236 static void perfMemory_exit_helper() {
4237 perfMemory_exit();
4238 }
4239 }
4240
4241 static jint initSock();
4242
4243 // this is called _after_ the global arguments have been parsed
4244 jint os::init_2(void) {
4245
4246 // This could be set any time but all platforms
4247 // have to set it the same so we have to mirror Solaris.
4248 DEBUG_ONLY(os::set_mutex_init_done();)
4249
4250 // Setup Windows Exceptions
4251
4252 #if defined(USE_VECTORED_EXCEPTION_HANDLING)
4253 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler(1, topLevelVectoredExceptionFilter);
4254 previousUnhandledExceptionFilter = SetUnhandledExceptionFilter(topLevelUnhandledExceptionFilter);
4255 #elif INCLUDE_AOT
4256 // If AOT is enabled we need to install a vectored exception handler
4257 // in order to forward implicit exceptions from code in AOT
4258 // generated DLLs. This is necessary since these DLLs are not
4259 // registered for structured exceptions like codecache methods are.
4260 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4261 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4262 }
4263 #endif
4264
4265 // for debugging float code generation bugs
4266 if (ForceFloatExceptions) {
4267 #ifndef _WIN64
4268 static long fp_control_word = 0;
4269 __asm { fstcw fp_control_word }
4270 // see Intel PPro Manual, Vol. 2, p 7-16
4271 const long precision = 0x20;
4272 const long underflow = 0x10;
4273 const long overflow = 0x08;
4274 const long zero_div = 0x04;
4275 const long denorm = 0x02;
4276 const long invalid = 0x01;
4277 fp_control_word |= invalid;
4278 __asm { fldcw fp_control_word }
4279 #endif
4280 }
4281
4282 // If stack_commit_size is 0, windows will reserve the default size,
4283 // but only commit a small portion of it.
4284 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4285 size_t default_reserve_size = os::win32::default_stack_size();
4286 size_t actual_reserve_size = stack_commit_size;
4287 if (stack_commit_size < default_reserve_size) {
4288 // If stack_commit_size == 0, we want this too
4289 actual_reserve_size = default_reserve_size;
4290 }
4291
4292 // Check minimum allowable stack size for thread creation and to initialize
4293 // the java system classes, including StackOverflowError - depends on page
4294 // size. Add two 4K pages for compiler2 recursion in main thread.
4295 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4296 // class initialization depending on 32 or 64 bit VM.
4297 size_t min_stack_allowed =
4298 (size_t)(JavaThread::stack_guard_zone_size() +
4299 JavaThread::stack_shadow_zone_size() +
4300 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4301
4302 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4303
4304 if (actual_reserve_size < min_stack_allowed) {
4305 tty->print_cr("\nThe Java thread stack size specified is too small. "
4306 "Specify at least %dk",
4307 min_stack_allowed / K);
4308 return JNI_ERR;
4309 }
4310
4311 JavaThread::set_stack_size_at_create(stack_commit_size);
4312
4313 // Calculate theoretical max. size of Threads to guard gainst artifical
4314 // out-of-memory situations, where all available address-space has been
4315 // reserved by thread stacks.
4316 assert(actual_reserve_size != 0, "Must have a stack");
4317
4318 // Calculate the thread limit when we should start doing Virtual Memory
4319 // banging. Currently when the threads will have used all but 200Mb of space.
4320 //
4321 // TODO: consider performing a similar calculation for commit size instead
4322 // as reserve size, since on a 64-bit platform we'll run into that more
4323 // often than running out of virtual memory space. We can use the
4324 // lower value of the two calculations as the os_thread_limit.
4325 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4326 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4327
4328 // at exit methods are called in the reverse order of their registration.
4329 // there is no limit to the number of functions registered. atexit does
4330 // not set errno.
4331
4332 if (PerfAllowAtExitRegistration) {
4333 // only register atexit functions if PerfAllowAtExitRegistration is set.
4334 // atexit functions can be delayed until process exit time, which
4335 // can be problematic for embedded VM situations. Embedded VMs should
4336 // call DestroyJavaVM() to assure that VM resources are released.
4337
4338 // note: perfMemory_exit_helper atexit function may be removed in
4339 // the future if the appropriate cleanup code can be added to the
4340 // VM_Exit VMOperation's doit method.
4341 if (atexit(perfMemory_exit_helper) != 0) {
4342 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4343 }
4344 }
4345
4346 #ifndef _WIN64
4347 // Print something if NX is enabled (win32 on AMD64)
4348 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4349 #endif
4350
4351 // initialize thread priority policy
4352 prio_init();
4353
4354 UseNUMA = false; // We don't fully support this yet
4355
4356 if (UseNUMAInterleaving || (UseNUMA && FLAG_IS_DEFAULT(UseNUMAInterleaving))) {
4357 if (!numa_interleaving_init()) {
4358 FLAG_SET_ERGO(UseNUMAInterleaving, false);
4359 } else if (!UseNUMAInterleaving) {
4360 // When NUMA requested, not-NUMA-aware allocations default to interleaving.
4361 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4362 }
4363 }
4364
4365 if (initSock() != JNI_OK) {
4366 return JNI_ERR;
4367 }
4368
4369 SymbolEngine::recalc_search_path();
4370
4371 // Initialize data for jdk.internal.misc.Signal
4372 if (!ReduceSignalUsage) {
4373 jdk_misc_signal_init();
4374 }
4375
4376 return JNI_OK;
4377 }
4378
4379 // combine the high and low DWORD into a ULONGLONG
4380 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4381 ULONGLONG value = high_word;
4382 value <<= sizeof(high_word) * 8;
4383 value |= low_word;
4384 return value;
4385 }
4386
4387 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4388 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4389 ::memset((void*)sbuf, 0, sizeof(struct stat));
4390 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4391 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4392 file_data.ftLastWriteTime.dwLowDateTime);
4393 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4394 file_data.ftCreationTime.dwLowDateTime);
4395 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4396 file_data.ftLastAccessTime.dwLowDateTime);
4397 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4398 sbuf->st_mode |= S_IFDIR;
4399 } else {
4400 sbuf->st_mode |= S_IFREG;
4401 }
4402 }
4403
4404 static errno_t convert_to_unicode(char const* char_path, LPWSTR* unicode_path) {
4405 // Get required buffer size to convert to Unicode
4406 int unicode_path_len = MultiByteToWideChar(CP_ACP,
4407 MB_ERR_INVALID_CHARS,
4408 char_path, -1,
4409 NULL, 0);
4410 if (unicode_path_len == 0) {
4411 return EINVAL;
4412 }
4413
4414 *unicode_path = NEW_C_HEAP_ARRAY(WCHAR, unicode_path_len, mtInternal);
4415
4416 int result = MultiByteToWideChar(CP_ACP,
4417 MB_ERR_INVALID_CHARS,
4418 char_path, -1,
4419 *unicode_path, unicode_path_len);
4420 assert(result == unicode_path_len, "length already checked above");
4421
4422 return ERROR_SUCCESS;
4423 }
4424
4425 static errno_t get_full_path(LPCWSTR unicode_path, LPWSTR* full_path) {
4426 // Get required buffer size to convert to full path. The return
4427 // value INCLUDES the terminating null character.
4428 DWORD full_path_len = GetFullPathNameW(unicode_path, 0, NULL, NULL);
4429 if (full_path_len == 0) {
4430 return EINVAL;
4431 }
4432
4433 *full_path = NEW_C_HEAP_ARRAY(WCHAR, full_path_len, mtInternal);
4434
4435 // When the buffer has sufficient size, the return value EXCLUDES the
4436 // terminating null character
4437 DWORD result = GetFullPathNameW(unicode_path, full_path_len, *full_path, NULL);
4438 assert(result <= full_path_len, "length already checked above");
4439
4440 return ERROR_SUCCESS;
4441 }
4442
4443 static void set_path_prefix(char* buf, LPWSTR* prefix, int* prefix_off, bool* needs_fullpath) {
4444 *prefix_off = 0;
4445 *needs_fullpath = true;
4446
4447 if (::isalpha(buf[0]) && !::IsDBCSLeadByte(buf[0]) && buf[1] == ':' && buf[2] == '\\') {
4448 *prefix = L"\\\\?\\";
4449 } else if (buf[0] == '\\' && buf[1] == '\\') {
4450 if (buf[2] == '?' && buf[3] == '\\') {
4451 *prefix = L"";
4452 *needs_fullpath = false;
4453 } else {
4454 *prefix = L"\\\\?\\UNC";
4455 *prefix_off = 1; // Overwrite the first char with the prefix, so \\share\path becomes \\?\UNC\share\path
4456 }
4457 } else {
4458 *prefix = L"\\\\?\\";
4459 }
4460 }
4461
4462 // Returns the given path as an absolute wide path in unc format. The returned path is NULL
4463 // on error (with err being set accordingly) and should be freed via os::free() otherwise.
4464 // additional_space is the size of space, in wchar_t, the function will additionally add to
4465 // the allocation of return buffer (such that the size of the returned buffer is at least
4466 // wcslen(buf) + 1 + additional_space).
4467 static wchar_t* wide_abs_unc_path(char const* path, errno_t & err, int additional_space = 0) {
4468 if ((path == NULL) || (path[0] == '\0')) {
4469 err = ENOENT;
4470 return NULL;
4471 }
4472
4473 // Need to allocate at least room for 3 characters, since os::native_path transforms C: to C:.
4474 size_t buf_len = 1 + MAX2((size_t)3, strlen(path));
4475 char* buf = NEW_C_HEAP_ARRAY(char, buf_len, mtInternal);
4476 strncpy(buf, path, buf_len);
4477 os::native_path(buf);
4478
4479 LPWSTR prefix = NULL;
4480 int prefix_off = 0;
4481 bool needs_fullpath = true;
4482 set_path_prefix(buf, &prefix, &prefix_off, &needs_fullpath);
4483
4484 LPWSTR unicode_path = NULL;
4485 err = convert_to_unicode(buf, &unicode_path);
4486 FREE_C_HEAP_ARRAY(char, buf);
4487 if (err != ERROR_SUCCESS) {
4488 return NULL;
4489 }
4490
4491 LPWSTR converted_path = NULL;
4492 if (needs_fullpath) {
4493 err = get_full_path(unicode_path, &converted_path);
4494 } else {
4495 converted_path = unicode_path;
4496 }
4497
4498 LPWSTR result = NULL;
4499 if (converted_path != NULL) {
4500 size_t prefix_len = wcslen(prefix);
4501 size_t result_len = prefix_len - prefix_off + wcslen(converted_path) + additional_space + 1;
4502 result = NEW_C_HEAP_ARRAY(WCHAR, result_len, mtInternal);
4503 _snwprintf(result, result_len, L"%s%s", prefix, &converted_path[prefix_off]);
4504
4505 // Remove trailing pathsep (not for \\?\<DRIVE>:\, since it would make it relative)
4506 result_len = wcslen(result);
4507 if ((result[result_len - 1] == L'\\') &&
4508 !(::iswalpha(result[4]) && result[5] == L':' && result_len == 7)) {
4509 result[result_len - 1] = L'\0';
4510 }
4511 }
4512
4513 if (converted_path != unicode_path) {
4514 FREE_C_HEAP_ARRAY(WCHAR, converted_path);
4515 }
4516 FREE_C_HEAP_ARRAY(WCHAR, unicode_path);
4517
4518 return static_cast<wchar_t*>(result); // LPWSTR and wchat_t* are the same type on Windows.
4519 }
4520
4521 int os::stat(const char *path, struct stat *sbuf) {
4522 errno_t err;
4523 wchar_t* wide_path = wide_abs_unc_path(path, err);
4524
4525 if (wide_path == NULL) {
4526 errno = err;
4527 return -1;
4528 }
4529
4530 WIN32_FILE_ATTRIBUTE_DATA file_data;;
4531 BOOL bret = ::GetFileAttributesExW(wide_path, GetFileExInfoStandard, &file_data);
4532 os::free(wide_path);
4533
4534 if (!bret) {
4535 errno = ::GetLastError();
4536 return -1;
4537 }
4538
4539 file_attribute_data_to_stat(sbuf, file_data);
4540 return 0;
4541 }
4542
4543 static HANDLE create_read_only_file_handle(const char* file) {
4544 errno_t err;
4545 wchar_t* wide_path = wide_abs_unc_path(file, err);
4546
4547 if (wide_path == NULL) {
4548 errno = err;
4549 return INVALID_HANDLE_VALUE;
4550 }
4551
4552 HANDLE handle = ::CreateFileW(wide_path, 0, FILE_SHARE_READ,
4553 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4554 os::free(wide_path);
4555
4556 return handle;
4557 }
4558
4559 bool os::same_files(const char* file1, const char* file2) {
4560
4561 if (file1 == NULL && file2 == NULL) {
4562 return true;
4563 }
4564
4565 if (file1 == NULL || file2 == NULL) {
4566 return false;
4567 }
4568
4569 if (strcmp(file1, file2) == 0) {
4570 return true;
4571 }
4572
4573 HANDLE handle1 = create_read_only_file_handle(file1);
4574 HANDLE handle2 = create_read_only_file_handle(file2);
4575 bool result = false;
4576
4577 // if we could open both paths...
4578 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4579 BY_HANDLE_FILE_INFORMATION fileInfo1;
4580 BY_HANDLE_FILE_INFORMATION fileInfo2;
4581 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4582 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4583 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4584 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4585 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4586 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4587 result = true;
4588 }
4589 }
4590 }
4591
4592 //free the handles
4593 if (handle1 != INVALID_HANDLE_VALUE) {
4594 ::CloseHandle(handle1);
4595 }
4596
4597 if (handle2 != INVALID_HANDLE_VALUE) {
4598 ::CloseHandle(handle2);
4599 }
4600
4601 return result;
4602 }
4603
4604 #define FT2INT64(ft) \
4605 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4606
4607
4608 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4609 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4610 // of a thread.
4611 //
4612 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4613 // the fast estimate available on the platform.
4614
4615 // current_thread_cpu_time() is not optimized for Windows yet
4616 jlong os::current_thread_cpu_time() {
4617 // return user + sys since the cost is the same
4618 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4619 }
4620
4621 jlong os::thread_cpu_time(Thread* thread) {
4622 // consistent with what current_thread_cpu_time() returns.
4623 return os::thread_cpu_time(thread, true /* user+sys */);
4624 }
4625
4626 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4627 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4628 }
4629
4630 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4631 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4632 // If this function changes, os::is_thread_cpu_time_supported() should too
4633 FILETIME CreationTime;
4634 FILETIME ExitTime;
4635 FILETIME KernelTime;
4636 FILETIME UserTime;
4637
4638 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4639 &ExitTime, &KernelTime, &UserTime) == 0) {
4640 return -1;
4641 } else if (user_sys_cpu_time) {
4642 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4643 } else {
4644 return FT2INT64(UserTime) * 100;
4645 }
4646 }
4647
4648 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4649 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4650 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4651 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4652 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4653 }
4654
4655 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4656 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4657 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4658 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4659 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4660 }
4661
4662 bool os::is_thread_cpu_time_supported() {
4663 // see os::thread_cpu_time
4664 FILETIME CreationTime;
4665 FILETIME ExitTime;
4666 FILETIME KernelTime;
4667 FILETIME UserTime;
4668
4669 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4670 &KernelTime, &UserTime) == 0) {
4671 return false;
4672 } else {
4673 return true;
4674 }
4675 }
4676
4677 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4678 // It does have primitives (PDH API) to get CPU usage and run queue length.
4679 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4680 // If we wanted to implement loadavg on Windows, we have a few options:
4681 //
4682 // a) Query CPU usage and run queue length and "fake" an answer by
4683 // returning the CPU usage if it's under 100%, and the run queue
4684 // length otherwise. It turns out that querying is pretty slow
4685 // on Windows, on the order of 200 microseconds on a fast machine.
4686 // Note that on the Windows the CPU usage value is the % usage
4687 // since the last time the API was called (and the first call
4688 // returns 100%), so we'd have to deal with that as well.
4689 //
4690 // b) Sample the "fake" answer using a sampling thread and store
4691 // the answer in a global variable. The call to loadavg would
4692 // just return the value of the global, avoiding the slow query.
4693 //
4694 // c) Sample a better answer using exponential decay to smooth the
4695 // value. This is basically the algorithm used by UNIX kernels.
4696 //
4697 // Note that sampling thread starvation could affect both (b) and (c).
4698 int os::loadavg(double loadavg[], int nelem) {
4699 return -1;
4700 }
4701
4702
4703 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4704 bool os::dont_yield() {
4705 return DontYieldALot;
4706 }
4707
4708 int os::open(const char *path, int oflag, int mode) {
4709 errno_t err;
4710 wchar_t* wide_path = wide_abs_unc_path(path, err);
4711
4712 if (wide_path == NULL) {
4713 errno = err;
4714 return -1;
4715 }
4716 int fd = ::_wopen(wide_path, oflag | O_BINARY | O_NOINHERIT, mode);
4717 os::free(wide_path);
4718
4719 if (fd == -1) {
4720 errno = ::GetLastError();
4721 }
4722
4723 return fd;
4724 }
4725
4726 FILE* os::open(int fd, const char* mode) {
4727 return ::_fdopen(fd, mode);
4728 }
4729
4730 // Is a (classpath) directory empty?
4731 bool os::dir_is_empty(const char* path) {
4732 errno_t err;
4733 wchar_t* wide_path = wide_abs_unc_path(path, err, 2);
4734
4735 if (wide_path == NULL) {
4736 errno = err;
4737 return false;
4738 }
4739
4740 // Make sure we end with "\\*"
4741 if (wide_path[wcslen(wide_path) - 1] == L'\\') {
4742 wcscat(wide_path, L"*");
4743 } else {
4744 wcscat(wide_path, L"\\*");
4745 }
4746
4747 WIN32_FIND_DATAW fd;
4748 HANDLE f = ::FindFirstFileW(wide_path, &fd);
4749 os::free(wide_path);
4750 bool is_empty = true;
4751
4752 if (f != INVALID_HANDLE_VALUE) {
4753 while (is_empty && ::FindNextFileW(f, &fd)) {
4754 // An empty directory contains only the current directory file
4755 // and the previous directory file.
4756 if ((wcscmp(fd.cFileName, L".") != 0) &&
4757 (wcscmp(fd.cFileName, L"..") != 0)) {
4758 is_empty = false;
4759 }
4760 }
4761 FindClose(f);
4762 } else {
4763 errno = ::GetLastError();
4764 }
4765
4766 return is_empty;
4767 }
4768
4769 // create binary file, rewriting existing file if required
4770 int os::create_binary_file(const char* path, bool rewrite_existing) {
4771 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4772 if (!rewrite_existing) {
4773 oflags |= _O_EXCL;
4774 }
4775 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4776 }
4777
4778 // return current position of file pointer
4779 jlong os::current_file_offset(int fd) {
4780 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4781 }
4782
4783 // move file pointer to the specified offset
4784 jlong os::seek_to_file_offset(int fd, jlong offset) {
4785 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4786 }
4787
4788
4789 jlong os::lseek(int fd, jlong offset, int whence) {
4790 return (jlong) ::_lseeki64(fd, offset, whence);
4791 }
4792
4793 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4794 OVERLAPPED ov;
4795 DWORD nread;
4796 BOOL result;
4797
4798 ZeroMemory(&ov, sizeof(ov));
4799 ov.Offset = (DWORD)offset;
4800 ov.OffsetHigh = (DWORD)(offset >> 32);
4801
4802 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4803
4804 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4805
4806 return result ? nread : 0;
4807 }
4808
4809
4810 // This method is a slightly reworked copy of JDK's sysNativePath
4811 // from src/windows/hpi/src/path_md.c
4812
4813 // Convert a pathname to native format. On win32, this involves forcing all
4814 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4815 // sometimes rejects '/') and removing redundant separators. The input path is
4816 // assumed to have been converted into the character encoding used by the local
4817 // system. Because this might be a double-byte encoding, care is taken to
4818 // treat double-byte lead characters correctly.
4819 //
4820 // This procedure modifies the given path in place, as the result is never
4821 // longer than the original. There is no error return; this operation always
4822 // succeeds.
4823 char * os::native_path(char *path) {
4824 char *src = path, *dst = path, *end = path;
4825 char *colon = NULL; // If a drive specifier is found, this will
4826 // point to the colon following the drive letter
4827
4828 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4829 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4830 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4831
4832 // Check for leading separators
4833 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4834 while (isfilesep(*src)) {
4835 src++;
4836 }
4837
4838 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4839 // Remove leading separators if followed by drive specifier. This
4840 // hack is necessary to support file URLs containing drive
4841 // specifiers (e.g., "file://c:/path"). As a side effect,
4842 // "/c:/path" can be used as an alternative to "c:/path".
4843 *dst++ = *src++;
4844 colon = dst;
4845 *dst++ = ':';
4846 src++;
4847 } else {
4848 src = path;
4849 if (isfilesep(src[0]) && isfilesep(src[1])) {
4850 // UNC pathname: Retain first separator; leave src pointed at
4851 // second separator so that further separators will be collapsed
4852 // into the second separator. The result will be a pathname
4853 // beginning with "\\\\" followed (most likely) by a host name.
4854 src = dst = path + 1;
4855 path[0] = '\\'; // Force first separator to '\\'
4856 }
4857 }
4858
4859 end = dst;
4860
4861 // Remove redundant separators from remainder of path, forcing all
4862 // separators to be '\\' rather than '/'. Also, single byte space
4863 // characters are removed from the end of the path because those
4864 // are not legal ending characters on this operating system.
4865 //
4866 while (*src != '\0') {
4867 if (isfilesep(*src)) {
4868 *dst++ = '\\'; src++;
4869 while (isfilesep(*src)) src++;
4870 if (*src == '\0') {
4871 // Check for trailing separator
4872 end = dst;
4873 if (colon == dst - 2) break; // "z:\\"
4874 if (dst == path + 1) break; // "\\"
4875 if (dst == path + 2 && isfilesep(path[0])) {
4876 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4877 // beginning of a UNC pathname. Even though it is not, by
4878 // itself, a valid UNC pathname, we leave it as is in order
4879 // to be consistent with the path canonicalizer as well
4880 // as the win32 APIs, which treat this case as an invalid
4881 // UNC pathname rather than as an alias for the root
4882 // directory of the current drive.
4883 break;
4884 }
4885 end = --dst; // Path does not denote a root directory, so
4886 // remove trailing separator
4887 break;
4888 }
4889 end = dst;
4890 } else {
4891 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4892 *dst++ = *src++;
4893 if (*src) *dst++ = *src++;
4894 end = dst;
4895 } else { // Copy a single-byte character
4896 char c = *src++;
4897 *dst++ = c;
4898 // Space is not a legal ending character
4899 if (c != ' ') end = dst;
4900 }
4901 }
4902 }
4903
4904 *end = '\0';
4905
4906 // For "z:", add "." to work around a bug in the C runtime library
4907 if (colon == dst - 1) {
4908 path[2] = '.';
4909 path[3] = '\0';
4910 }
4911
4912 return path;
4913 }
4914
4915 // This code is a copy of JDK's sysSetLength
4916 // from src/windows/hpi/src/sys_api_md.c
4917
4918 int os::ftruncate(int fd, jlong length) {
4919 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4920 long high = (long)(length >> 32);
4921 DWORD ret;
4922
4923 if (h == (HANDLE)(-1)) {
4924 return -1;
4925 }
4926
4927 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4928 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4929 return -1;
4930 }
4931
4932 if (::SetEndOfFile(h) == FALSE) {
4933 return -1;
4934 }
4935
4936 return 0;
4937 }
4938
4939 int os::get_fileno(FILE* fp) {
4940 return _fileno(fp);
4941 }
4942
4943 // This code is a copy of JDK's sysSync
4944 // from src/windows/hpi/src/sys_api_md.c
4945 // except for the legacy workaround for a bug in Win 98
4946
4947 int os::fsync(int fd) {
4948 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4949
4950 if ((!::FlushFileBuffers(handle)) &&
4951 (GetLastError() != ERROR_ACCESS_DENIED)) {
4952 // from winerror.h
4953 return -1;
4954 }
4955 return 0;
4956 }
4957
4958 static int nonSeekAvailable(int, long *);
4959 static int stdinAvailable(int, long *);
4960
4961 // This code is a copy of JDK's sysAvailable
4962 // from src/windows/hpi/src/sys_api_md.c
4963
4964 int os::available(int fd, jlong *bytes) {
4965 jlong cur, end;
4966 struct _stati64 stbuf64;
4967
4968 if (::_fstati64(fd, &stbuf64) >= 0) {
4969 int mode = stbuf64.st_mode;
4970 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4971 int ret;
4972 long lpbytes;
4973 if (fd == 0) {
4974 ret = stdinAvailable(fd, &lpbytes);
4975 } else {
4976 ret = nonSeekAvailable(fd, &lpbytes);
4977 }
4978 (*bytes) = (jlong)(lpbytes);
4979 return ret;
4980 }
4981 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4982 return FALSE;
4983 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4984 return FALSE;
4985 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4986 return FALSE;
4987 }
4988 *bytes = end - cur;
4989 return TRUE;
4990 } else {
4991 return FALSE;
4992 }
4993 }
4994
4995 void os::flockfile(FILE* fp) {
4996 _lock_file(fp);
4997 }
4998
4999 void os::funlockfile(FILE* fp) {
5000 _unlock_file(fp);
5001 }
5002
5003 // This code is a copy of JDK's nonSeekAvailable
5004 // from src/windows/hpi/src/sys_api_md.c
5005
5006 static int nonSeekAvailable(int fd, long *pbytes) {
5007 // This is used for available on non-seekable devices
5008 // (like both named and anonymous pipes, such as pipes
5009 // connected to an exec'd process).
5010 // Standard Input is a special case.
5011 HANDLE han;
5012
5013 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
5014 return FALSE;
5015 }
5016
5017 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
5018 // PeekNamedPipe fails when at EOF. In that case we
5019 // simply make *pbytes = 0 which is consistent with the
5020 // behavior we get on Solaris when an fd is at EOF.
5021 // The only alternative is to raise an Exception,
5022 // which isn't really warranted.
5023 //
5024 if (::GetLastError() != ERROR_BROKEN_PIPE) {
5025 return FALSE;
5026 }
5027 *pbytes = 0;
5028 }
5029 return TRUE;
5030 }
5031
5032 #define MAX_INPUT_EVENTS 2000
5033
5034 // This code is a copy of JDK's stdinAvailable
5035 // from src/windows/hpi/src/sys_api_md.c
5036
5037 static int stdinAvailable(int fd, long *pbytes) {
5038 HANDLE han;
5039 DWORD numEventsRead = 0; // Number of events read from buffer
5040 DWORD numEvents = 0; // Number of events in buffer
5041 DWORD i = 0; // Loop index
5042 DWORD curLength = 0; // Position marker
5043 DWORD actualLength = 0; // Number of bytes readable
5044 BOOL error = FALSE; // Error holder
5045 INPUT_RECORD *lpBuffer; // Pointer to records of input events
5046
5047 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
5048 return FALSE;
5049 }
5050
5051 // Construct an array of input records in the console buffer
5052 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
5053 if (error == 0) {
5054 return nonSeekAvailable(fd, pbytes);
5055 }
5056
5057 // lpBuffer must fit into 64K or else PeekConsoleInput fails
5058 if (numEvents > MAX_INPUT_EVENTS) {
5059 numEvents = MAX_INPUT_EVENTS;
5060 }
5061
5062 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
5063 if (lpBuffer == NULL) {
5064 return FALSE;
5065 }
5066
5067 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
5068 if (error == 0) {
5069 os::free(lpBuffer);
5070 return FALSE;
5071 }
5072
5073 // Examine input records for the number of bytes available
5074 for (i=0; i<numEvents; i++) {
5075 if (lpBuffer[i].EventType == KEY_EVENT) {
5076
5077 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
5078 &(lpBuffer[i].Event);
5079 if (keyRecord->bKeyDown == TRUE) {
5080 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
5081 curLength++;
5082 if (*keyPressed == '\r') {
5083 actualLength = curLength;
5084 }
5085 }
5086 }
5087 }
5088
5089 if (lpBuffer != NULL) {
5090 os::free(lpBuffer);
5091 }
5092
5093 *pbytes = (long) actualLength;
5094 return TRUE;
5095 }
5096
5097 // Map a block of memory.
5098 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5099 char *addr, size_t bytes, bool read_only,
5100 bool allow_exec) {
5101 HANDLE hFile;
5102 char* base;
5103
5104 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
5105 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
5106 if (hFile == INVALID_HANDLE_VALUE) {
5107 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
5108 return NULL;
5109 }
5110
5111 if (allow_exec) {
5112 // CreateFileMapping/MapViewOfFileEx can't map executable memory
5113 // unless it comes from a PE image (which the shared archive is not.)
5114 // Even VirtualProtect refuses to give execute access to mapped memory
5115 // that was not previously executable.
5116 //
5117 // Instead, stick the executable region in anonymous memory. Yuck.
5118 // Penalty is that ~4 pages will not be shareable - in the future
5119 // we might consider DLLizing the shared archive with a proper PE
5120 // header so that mapping executable + sharing is possible.
5121
5122 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
5123 PAGE_READWRITE);
5124 if (base == NULL) {
5125 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
5126 CloseHandle(hFile);
5127 return NULL;
5128 }
5129
5130 // Record virtual memory allocation
5131 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
5132
5133 DWORD bytes_read;
5134 OVERLAPPED overlapped;
5135 overlapped.Offset = (DWORD)file_offset;
5136 overlapped.OffsetHigh = 0;
5137 overlapped.hEvent = NULL;
5138 // ReadFile guarantees that if the return value is true, the requested
5139 // number of bytes were read before returning.
5140 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
5141 if (!res) {
5142 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
5143 release_memory(base, bytes);
5144 CloseHandle(hFile);
5145 return NULL;
5146 }
5147 } else {
5148 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
5149 NULL /* file_name */);
5150 if (hMap == NULL) {
5151 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
5152 CloseHandle(hFile);
5153 return NULL;
5154 }
5155
5156 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
5157 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
5158 (DWORD)bytes, addr);
5159 if (base == NULL) {
5160 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
5161 CloseHandle(hMap);
5162 CloseHandle(hFile);
5163 return NULL;
5164 }
5165
5166 if (CloseHandle(hMap) == 0) {
5167 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
5168 CloseHandle(hFile);
5169 return base;
5170 }
5171 }
5172
5173 if (allow_exec) {
5174 DWORD old_protect;
5175 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
5176 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
5177
5178 if (!res) {
5179 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
5180 // Don't consider this a hard error, on IA32 even if the
5181 // VirtualProtect fails, we should still be able to execute
5182 CloseHandle(hFile);
5183 return base;
5184 }
5185 }
5186
5187 if (CloseHandle(hFile) == 0) {
5188 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
5189 return base;
5190 }
5191
5192 return base;
5193 }
5194
5195
5196 // Remap a block of memory.
5197 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5198 char *addr, size_t bytes, bool read_only,
5199 bool allow_exec) {
5200 // This OS does not allow existing memory maps to be remapped so we
5201 // would have to unmap the memory before we remap it.
5202
5203 // Because there is a small window between unmapping memory and mapping
5204 // it in again with different protections, CDS archives are mapped RW
5205 // on windows, so this function isn't called.
5206 ShouldNotReachHere();
5207 return NULL;
5208 }
5209
5210
5211 // Unmap a block of memory.
5212 // Returns true=success, otherwise false.
5213
5214 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5215 MEMORY_BASIC_INFORMATION mem_info;
5216 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5217 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5218 return false;
5219 }
5220
5221 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5222 // Instead, executable region was allocated using VirtualAlloc(). See
5223 // pd_map_memory() above.
5224 //
5225 // The following flags should match the 'exec_access' flages used for
5226 // VirtualProtect() in pd_map_memory().
5227 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5228 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5229 return pd_release_memory(addr, bytes);
5230 }
5231
5232 BOOL result = UnmapViewOfFile(addr);
5233 if (result == 0) {
5234 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5235 return false;
5236 }
5237 return true;
5238 }
5239
5240 void os::pause() {
5241 char filename[MAX_PATH];
5242 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5243 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
5244 } else {
5245 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5246 }
5247
5248 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5249 if (fd != -1) {
5250 struct stat buf;
5251 ::close(fd);
5252 while (::stat(filename, &buf) == 0) {
5253 Sleep(100);
5254 }
5255 } else {
5256 jio_fprintf(stderr,
5257 "Could not open pause file '%s', continuing immediately.\n", filename);
5258 }
5259 }
5260
5261 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5262 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5263 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5264
5265 os::ThreadCrashProtection::ThreadCrashProtection() {
5266 }
5267
5268 // See the caveats for this class in os_windows.hpp
5269 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5270 // into this method and returns false. If no OS EXCEPTION was raised, returns
5271 // true.
5272 // The callback is supposed to provide the method that should be protected.
5273 //
5274 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5275
5276 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5277
5278 _protected_thread = Thread::current_or_null();
5279 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5280
5281 bool success = true;
5282 __try {
5283 _crash_protection = this;
5284 cb.call();
5285 } __except(EXCEPTION_EXECUTE_HANDLER) {
5286 // only for protection, nothing to do
5287 success = false;
5288 }
5289 _crash_protection = NULL;
5290 _protected_thread = NULL;
5291 Thread::muxRelease(&_crash_mux);
5292 return success;
5293 }
5294
5295
5296 class HighResolutionInterval : public CHeapObj<mtThread> {
5297 // The default timer resolution seems to be 10 milliseconds.
5298 // (Where is this written down?)
5299 // If someone wants to sleep for only a fraction of the default,
5300 // then we set the timer resolution down to 1 millisecond for
5301 // the duration of their interval.
5302 // We carefully set the resolution back, since otherwise we
5303 // seem to incur an overhead (3%?) that we don't need.
5304 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5305 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5306 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5307 // timeBeginPeriod() if the relative error exceeded some threshold.
5308 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5309 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5310 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5311 // resolution timers running.
5312 private:
5313 jlong resolution;
5314 public:
5315 HighResolutionInterval(jlong ms) {
5316 resolution = ms % 10L;
5317 if (resolution != 0) {
5318 MMRESULT result = timeBeginPeriod(1L);
5319 }
5320 }
5321 ~HighResolutionInterval() {
5322 if (resolution != 0) {
5323 MMRESULT result = timeEndPeriod(1L);
5324 }
5325 resolution = 0L;
5326 }
5327 };
5328
5329 // An Event wraps a win32 "CreateEvent" kernel handle.
5330 //
5331 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5332 //
5333 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5334 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5335 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5336 // In addition, an unpark() operation might fetch the handle field, but the
5337 // event could recycle between the fetch and the SetEvent() operation.
5338 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5339 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5340 // on an stale but recycled handle would be harmless, but in practice this might
5341 // confuse other non-Sun code, so it's not a viable approach.
5342 //
5343 // 2: Once a win32 event handle is associated with an Event, it remains associated
5344 // with the Event. The event handle is never closed. This could be construed
5345 // as handle leakage, but only up to the maximum # of threads that have been extant
5346 // at any one time. This shouldn't be an issue, as windows platforms typically
5347 // permit a process to have hundreds of thousands of open handles.
5348 //
5349 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5350 // and release unused handles.
5351 //
5352 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5353 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5354 //
5355 // 5. Use an RCU-like mechanism (Read-Copy Update).
5356 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5357 //
5358 // We use (2).
5359 //
5360 // TODO-FIXME:
5361 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5362 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5363 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5364 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5365 // into a single win32 CreateEvent() handle.
5366 //
5367 // Assumption:
5368 // Only one parker can exist on an event, which is why we allocate
5369 // them per-thread. Multiple unparkers can coexist.
5370 //
5371 // _Event transitions in park()
5372 // -1 => -1 : illegal
5373 // 1 => 0 : pass - return immediately
5374 // 0 => -1 : block; then set _Event to 0 before returning
5375 //
5376 // _Event transitions in unpark()
5377 // 0 => 1 : just return
5378 // 1 => 1 : just return
5379 // -1 => either 0 or 1; must signal target thread
5380 // That is, we can safely transition _Event from -1 to either
5381 // 0 or 1.
5382 //
5383 // _Event serves as a restricted-range semaphore.
5384 // -1 : thread is blocked, i.e. there is a waiter
5385 // 0 : neutral: thread is running or ready,
5386 // could have been signaled after a wait started
5387 // 1 : signaled - thread is running or ready
5388 //
5389 // Another possible encoding of _Event would be with
5390 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5391 //
5392
5393 int os::PlatformEvent::park(jlong Millis) {
5394 // Transitions for _Event:
5395 // -1 => -1 : illegal
5396 // 1 => 0 : pass - return immediately
5397 // 0 => -1 : block; then set _Event to 0 before returning
5398
5399 guarantee(_ParkHandle != NULL , "Invariant");
5400 guarantee(Millis > 0 , "Invariant");
5401
5402 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5403 // the initial park() operation.
5404 // Consider: use atomic decrement instead of CAS-loop
5405
5406 int v;
5407 for (;;) {
5408 v = _Event;
5409 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5410 }
5411 guarantee((v == 0) || (v == 1), "invariant");
5412 if (v != 0) return OS_OK;
5413
5414 // Do this the hard way by blocking ...
5415 // TODO: consider a brief spin here, gated on the success of recent
5416 // spin attempts by this thread.
5417 //
5418 // We decompose long timeouts into series of shorter timed waits.
5419 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5420 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5421 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5422 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5423 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5424 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5425 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5426 // for the already waited time. This policy does not admit any new outcomes.
5427 // In the future, however, we might want to track the accumulated wait time and
5428 // adjust Millis accordingly if we encounter a spurious wakeup.
5429
5430 const int MAXTIMEOUT = 0x10000000;
5431 DWORD rv = WAIT_TIMEOUT;
5432 while (_Event < 0 && Millis > 0) {
5433 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5434 if (Millis > MAXTIMEOUT) {
5435 prd = MAXTIMEOUT;
5436 }
5437 HighResolutionInterval *phri = NULL;
5438 if (!ForceTimeHighResolution) {
5439 phri = new HighResolutionInterval(prd);
5440 }
5441 rv = ::WaitForSingleObject(_ParkHandle, prd);
5442 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5443 if (rv == WAIT_TIMEOUT) {
5444 Millis -= prd;
5445 }
5446 delete phri; // if it is NULL, harmless
5447 }
5448 v = _Event;
5449 _Event = 0;
5450 // see comment at end of os::PlatformEvent::park() below:
5451 OrderAccess::fence();
5452 // If we encounter a nearly simultanous timeout expiry and unpark()
5453 // we return OS_OK indicating we awoke via unpark().
5454 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5455 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5456 }
5457
5458 void os::PlatformEvent::park() {
5459 // Transitions for _Event:
5460 // -1 => -1 : illegal
5461 // 1 => 0 : pass - return immediately
5462 // 0 => -1 : block; then set _Event to 0 before returning
5463
5464 guarantee(_ParkHandle != NULL, "Invariant");
5465 // Invariant: Only the thread associated with the Event/PlatformEvent
5466 // may call park().
5467 // Consider: use atomic decrement instead of CAS-loop
5468 int v;
5469 for (;;) {
5470 v = _Event;
5471 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5472 }
5473 guarantee((v == 0) || (v == 1), "invariant");
5474 if (v != 0) return;
5475
5476 // Do this the hard way by blocking ...
5477 // TODO: consider a brief spin here, gated on the success of recent
5478 // spin attempts by this thread.
5479 while (_Event < 0) {
5480 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5481 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5482 }
5483
5484 // Usually we'll find _Event == 0 at this point, but as
5485 // an optional optimization we clear it, just in case can
5486 // multiple unpark() operations drove _Event up to 1.
5487 _Event = 0;
5488 OrderAccess::fence();
5489 guarantee(_Event >= 0, "invariant");
5490 }
5491
5492 void os::PlatformEvent::unpark() {
5493 guarantee(_ParkHandle != NULL, "Invariant");
5494
5495 // Transitions for _Event:
5496 // 0 => 1 : just return
5497 // 1 => 1 : just return
5498 // -1 => either 0 or 1; must signal target thread
5499 // That is, we can safely transition _Event from -1 to either
5500 // 0 or 1.
5501 // See also: "Semaphores in Plan 9" by Mullender & Cox
5502 //
5503 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5504 // that it will take two back-to-back park() calls for the owning
5505 // thread to block. This has the benefit of forcing a spurious return
5506 // from the first park() call after an unpark() call which will help
5507 // shake out uses of park() and unpark() without condition variables.
5508
5509 if (Atomic::xchg(&_Event, 1) >= 0) return;
5510
5511 ::SetEvent(_ParkHandle);
5512 }
5513
5514
5515 // JSR166
5516 // -------------------------------------------------------
5517
5518 // The Windows implementation of Park is very straightforward: Basic
5519 // operations on Win32 Events turn out to have the right semantics to
5520 // use them directly. We opportunistically resuse the event inherited
5521 // from Monitor.
5522
5523 void Parker::park(bool isAbsolute, jlong time) {
5524 guarantee(_ParkEvent != NULL, "invariant");
5525 // First, demultiplex/decode time arguments
5526 if (time < 0) { // don't wait
5527 return;
5528 } else if (time == 0 && !isAbsolute) {
5529 time = INFINITE;
5530 } else if (isAbsolute) {
5531 time -= os::javaTimeMillis(); // convert to relative time
5532 if (time <= 0) { // already elapsed
5533 return;
5534 }
5535 } else { // relative
5536 time /= 1000000; // Must coarsen from nanos to millis
5537 if (time == 0) { // Wait for the minimal time unit if zero
5538 time = 1;
5539 }
5540 }
5541
5542 JavaThread* thread = JavaThread::current();
5543
5544 // Don't wait if interrupted or already triggered
5545 if (thread->is_interrupted(false) ||
5546 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5547 ResetEvent(_ParkEvent);
5548 return;
5549 } else {
5550 ThreadBlockInVM tbivm(thread);
5551 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5552 thread->set_suspend_equivalent();
5553
5554 WaitForSingleObject(_ParkEvent, time);
5555 ResetEvent(_ParkEvent);
5556
5557 // If externally suspended while waiting, re-suspend
5558 if (thread->handle_special_suspend_equivalent_condition()) {
5559 thread->java_suspend_self();
5560 }
5561 }
5562 }
5563
5564 void Parker::unpark() {
5565 guarantee(_ParkEvent != NULL, "invariant");
5566 SetEvent(_ParkEvent);
5567 }
5568
5569 // Platform Monitor implementation
5570
5571 // Must already be locked
5572 int os::PlatformMonitor::wait(jlong millis) {
5573 assert(millis >= 0, "negative timeout");
5574 int ret = OS_TIMEOUT;
5575 int status = SleepConditionVariableCS(&_cond, &_mutex,
5576 millis == 0 ? INFINITE : millis);
5577 if (status != 0) {
5578 ret = OS_OK;
5579 }
5580 #ifndef PRODUCT
5581 else {
5582 DWORD err = GetLastError();
5583 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5584 }
5585 #endif
5586 return ret;
5587 }
5588
5589 // Run the specified command in a separate process. Return its exit value,
5590 // or -1 on failure (e.g. can't create a new process).
5591 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5592 STARTUPINFO si;
5593 PROCESS_INFORMATION pi;
5594 DWORD exit_code;
5595
5596 char * cmd_string;
5597 const char * cmd_prefix = "cmd /C ";
5598 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5599 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5600 if (cmd_string == NULL) {
5601 return -1;
5602 }
5603 cmd_string[0] = '\0';
5604 strcat(cmd_string, cmd_prefix);
5605 strcat(cmd_string, cmd);
5606
5607 // now replace all '\n' with '&'
5608 char * substring = cmd_string;
5609 while ((substring = strchr(substring, '\n')) != NULL) {
5610 substring[0] = '&';
5611 substring++;
5612 }
5613 memset(&si, 0, sizeof(si));
5614 si.cb = sizeof(si);
5615 memset(&pi, 0, sizeof(pi));
5616 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5617 cmd_string, // command line
5618 NULL, // process security attribute
5619 NULL, // thread security attribute
5620 TRUE, // inherits system handles
5621 0, // no creation flags
5622 NULL, // use parent's environment block
5623 NULL, // use parent's starting directory
5624 &si, // (in) startup information
5625 &pi); // (out) process information
5626
5627 if (rslt) {
5628 // Wait until child process exits.
5629 WaitForSingleObject(pi.hProcess, INFINITE);
5630
5631 GetExitCodeProcess(pi.hProcess, &exit_code);
5632
5633 // Close process and thread handles.
5634 CloseHandle(pi.hProcess);
5635 CloseHandle(pi.hThread);
5636 } else {
5637 exit_code = -1;
5638 }
5639
5640 FREE_C_HEAP_ARRAY(char, cmd_string);
5641 return (int)exit_code;
5642 }
5643
5644 bool os::find(address addr, outputStream* st) {
5645 int offset = -1;
5646 bool result = false;
5647 char buf[256];
5648 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5649 st->print(PTR_FORMAT " ", addr);
5650 if (strlen(buf) < sizeof(buf) - 1) {
5651 char* p = strrchr(buf, '\\');
5652 if (p) {
5653 st->print("%s", p + 1);
5654 } else {
5655 st->print("%s", buf);
5656 }
5657 } else {
5658 // The library name is probably truncated. Let's omit the library name.
5659 // See also JDK-8147512.
5660 }
5661 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5662 st->print("::%s + 0x%x", buf, offset);
5663 }
5664 st->cr();
5665 result = true;
5666 }
5667 return result;
5668 }
5669
5670 static jint initSock() {
5671 WSADATA wsadata;
5672
5673 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5674 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5675 ::GetLastError());
5676 return JNI_ERR;
5677 }
5678 return JNI_OK;
5679 }
5680
5681 struct hostent* os::get_host_by_name(char* name) {
5682 return (struct hostent*)gethostbyname(name);
5683 }
5684
5685 int os::socket_close(int fd) {
5686 return ::closesocket(fd);
5687 }
5688
5689 int os::socket(int domain, int type, int protocol) {
5690 return ::socket(domain, type, protocol);
5691 }
5692
5693 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5694 return ::connect(fd, him, len);
5695 }
5696
5697 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5698 return ::recv(fd, buf, (int)nBytes, flags);
5699 }
5700
5701 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5702 return ::send(fd, buf, (int)nBytes, flags);
5703 }
5704
5705 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5706 return ::send(fd, buf, (int)nBytes, flags);
5707 }
5708
5709 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5710 #if defined(IA32)
5711 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5712 #elif defined(AMD64) || defined(_M_ARM64)
5713 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5714 #endif
5715
5716 // returns true if thread could be suspended,
5717 // false otherwise
5718 static bool do_suspend(HANDLE* h) {
5719 if (h != NULL) {
5720 if (SuspendThread(*h) != ~0) {
5721 return true;
5722 }
5723 }
5724 return false;
5725 }
5726
5727 // resume the thread
5728 // calling resume on an active thread is a no-op
5729 static void do_resume(HANDLE* h) {
5730 if (h != NULL) {
5731 ResumeThread(*h);
5732 }
5733 }
5734
5735 // retrieve a suspend/resume context capable handle
5736 // from the tid. Caller validates handle return value.
5737 void get_thread_handle_for_extended_context(HANDLE* h,
5738 OSThread::thread_id_t tid) {
5739 if (h != NULL) {
5740 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5741 }
5742 }
5743
5744 // Thread sampling implementation
5745 //
5746 void os::SuspendedThreadTask::internal_do_task() {
5747 CONTEXT ctxt;
5748 HANDLE h = NULL;
5749
5750 // get context capable handle for thread
5751 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5752
5753 // sanity
5754 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5755 return;
5756 }
5757
5758 // suspend the thread
5759 if (do_suspend(&h)) {
5760 ctxt.ContextFlags = sampling_context_flags;
5761 // get thread context
5762 GetThreadContext(h, &ctxt);
5763 SuspendedThreadTaskContext context(_thread, &ctxt);
5764 // pass context to Thread Sampling impl
5765 do_task(context);
5766 // resume thread
5767 do_resume(&h);
5768 }
5769
5770 // close handle
5771 CloseHandle(h);
5772 }
5773
5774 bool os::start_debugging(char *buf, int buflen) {
5775 int len = (int)strlen(buf);
5776 char *p = &buf[len];
5777
5778 jio_snprintf(p, buflen-len,
5779 "\n\n"
5780 "Do you want to debug the problem?\n\n"
5781 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5782 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5783 "Otherwise, select 'No' to abort...",
5784 os::current_process_id(), os::current_thread_id());
5785
5786 bool yes = os::message_box("Unexpected Error", buf);
5787
5788 if (yes) {
5789 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5790 // exception. If VM is running inside a debugger, the debugger will
5791 // catch the exception. Otherwise, the breakpoint exception will reach
5792 // the default windows exception handler, which can spawn a debugger and
5793 // automatically attach to the dying VM.
5794 os::breakpoint();
5795 yes = false;
5796 }
5797 return yes;
5798 }
5799
5800 void* os::get_default_process_handle() {
5801 return (void*)GetModuleHandle(NULL);
5802 }
5803
5804 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5805 // which is used to find statically linked in agents.
5806 // Additionally for windows, takes into account __stdcall names.
5807 // Parameters:
5808 // sym_name: Symbol in library we are looking for
5809 // lib_name: Name of library to look in, NULL for shared libs.
5810 // is_absolute_path == true if lib_name is absolute path to agent
5811 // such as "C:/a/b/L.dll"
5812 // == false if only the base name of the library is passed in
5813 // such as "L"
5814 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5815 bool is_absolute_path) {
5816 char *agent_entry_name;
5817 size_t len;
5818 size_t name_len;
5819 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5820 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5821 const char *start;
5822
5823 if (lib_name != NULL) {
5824 len = name_len = strlen(lib_name);
5825 if (is_absolute_path) {
5826 // Need to strip path, prefix and suffix
5827 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5828 lib_name = ++start;
5829 } else {
5830 // Need to check for drive prefix
5831 if ((start = strchr(lib_name, ':')) != NULL) {
5832 lib_name = ++start;
5833 }
5834 }
5835 if (len <= (prefix_len + suffix_len)) {
5836 return NULL;
5837 }
5838 lib_name += prefix_len;
5839 name_len = strlen(lib_name) - suffix_len;
5840 }
5841 }
5842 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5843 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5844 if (agent_entry_name == NULL) {
5845 return NULL;
5846 }
5847 if (lib_name != NULL) {
5848 const char *p = strrchr(sym_name, '@');
5849 if (p != NULL && p != sym_name) {
5850 // sym_name == _Agent_OnLoad@XX
5851 strncpy(agent_entry_name, sym_name, (p - sym_name));
5852 agent_entry_name[(p-sym_name)] = '\0';
5853 // agent_entry_name == _Agent_OnLoad
5854 strcat(agent_entry_name, "_");
5855 strncat(agent_entry_name, lib_name, name_len);
5856 strcat(agent_entry_name, p);
5857 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5858 } else {
5859 strcpy(agent_entry_name, sym_name);
5860 strcat(agent_entry_name, "_");
5861 strncat(agent_entry_name, lib_name, name_len);
5862 }
5863 } else {
5864 strcpy(agent_entry_name, sym_name);
5865 }
5866 return agent_entry_name;
5867 }
5868
5869 #ifndef PRODUCT
5870
5871 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5872 // contiguous memory block at a particular address.
5873 // The test first tries to find a good approximate address to allocate at by using the same
5874 // method to allocate some memory at any address. The test then tries to allocate memory in
5875 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5876 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5877 // the previously allocated memory is available for allocation. The only actual failure
5878 // that is reported is when the test tries to allocate at a particular location but gets a
5879 // different valid one. A NULL return value at this point is not considered an error but may
5880 // be legitimate.
5881 void TestReserveMemorySpecial_test() {
5882 if (!UseLargePages) {
5883 return;
5884 }
5885 // save current value of globals
5886 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5887 bool old_use_numa_interleaving = UseNUMAInterleaving;
5888
5889 // set globals to make sure we hit the correct code path
5890 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5891
5892 // do an allocation at an address selected by the OS to get a good one.
5893 const size_t large_allocation_size = os::large_page_size() * 4;
5894 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5895 if (result == NULL) {
5896 } else {
5897 os::release_memory_special(result, large_allocation_size);
5898
5899 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5900 // we managed to get it once.
5901 const size_t expected_allocation_size = os::large_page_size();
5902 char* expected_location = result + os::large_page_size();
5903 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5904 if (actual_location == NULL) {
5905 } else {
5906 // release memory
5907 os::release_memory_special(actual_location, expected_allocation_size);
5908 // only now check, after releasing any memory to avoid any leaks.
5909 assert(actual_location == expected_location,
5910 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5911 expected_location, expected_allocation_size, actual_location);
5912 }
5913 }
5914
5915 // restore globals
5916 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5917 UseNUMAInterleaving = old_use_numa_interleaving;
5918 }
5919 #endif // PRODUCT
5920
5921 /*
5922 All the defined signal names for Windows.
5923
5924 NOTE that not all of these names are accepted by FindSignal!
5925
5926 For various reasons some of these may be rejected at runtime.
5927
5928 Here are the names currently accepted by a user of sun.misc.Signal with
5929 1.4.1 (ignoring potential interaction with use of chaining, etc):
5930
5931 (LIST TBD)
5932
5933 */
5934 int os::get_signal_number(const char* name) {
5935 static const struct {
5936 const char* name;
5937 int number;
5938 } siglabels [] =
5939 // derived from version 6.0 VC98/include/signal.h
5940 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5941 "FPE", SIGFPE, // floating point exception
5942 "SEGV", SIGSEGV, // segment violation
5943 "INT", SIGINT, // interrupt
5944 "TERM", SIGTERM, // software term signal from kill
5945 "BREAK", SIGBREAK, // Ctrl-Break sequence
5946 "ILL", SIGILL}; // illegal instruction
5947 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5948 if (strcmp(name, siglabels[i].name) == 0) {
5949 return siglabels[i].number;
5950 }
5951 }
5952 return -1;
5953 }
5954
5955 // Fast current thread access
5956
5957 int os::win32::_thread_ptr_offset = 0;
5958
5959 static void call_wrapper_dummy() {}
5960
5961 // We need to call the os_exception_wrapper once so that it sets
5962 // up the offset from FS of the thread pointer.
5963 void os::win32::initialize_thread_ptr_offset() {
5964 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5965 NULL, methodHandle(), NULL, NULL);
5966 }
5967
5968 bool os::supports_map_sync() {
5969 return false;
5970 }