1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/interfaceSupport.inline.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/javaCalls.hpp"
53 #include "runtime/mutexLocker.hpp"
54 #include "runtime/objectMonitor.hpp"
55 #include "runtime/orderAccess.hpp"
56 #include "runtime/osThread.hpp"
57 #include "runtime/perfMemory.hpp"
58 #include "runtime/safepointMechanism.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/macros.hpp"
74 #include "utilities/vmError.hpp"
75 #include "symbolengine.hpp"
76 #include "windbghelp.hpp"
77
78 #ifdef _DEBUG
79 #include <crtdbg.h>
80 #endif
81
82 #include <windows.h>
83 #include <sys/types.h>
84 #include <sys/stat.h>
85 #include <sys/timeb.h>
86 #include <objidl.h>
87 #include <shlobj.h>
88
89 #include <malloc.h>
90 #include <signal.h>
91 #include <direct.h>
92 #include <errno.h>
93 #include <fcntl.h>
94 #include <io.h>
95 #include <process.h> // For _beginthreadex(), _endthreadex()
96 #include <imagehlp.h> // For os::dll_address_to_function_name
97 // for enumerating dll libraries
98 #include <vdmdbg.h>
99 #include <psapi.h>
100 #include <mmsystem.h>
101 #include <winsock2.h>
102
103 // for timer info max values which include all bits
104 #define ALL_64_BITS CONST64(-1)
105
106 // For DLL loading/load error detection
107 // Values of PE COFF
108 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
109 #define IMAGE_FILE_SIGNATURE_LENGTH 4
110
111 static HANDLE main_process;
112 static HANDLE main_thread;
113 static int main_thread_id;
114
115 static FILETIME process_creation_time;
116 static FILETIME process_exit_time;
117 static FILETIME process_user_time;
118 static FILETIME process_kernel_time;
119
120 #ifdef _M_AMD64
121 #define __CPU__ amd64
122 #else
123 #define __CPU__ i486
124 #endif
125
126 #if INCLUDE_AOT
127 PVOID topLevelVectoredExceptionHandler = NULL;
128 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
129 #endif
130
131 // save DLL module handle, used by GetModuleFileName
132
133 HINSTANCE vm_lib_handle;
134
135 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
136 switch (reason) {
137 case DLL_PROCESS_ATTACH:
138 vm_lib_handle = hinst;
139 if (ForceTimeHighResolution) {
140 timeBeginPeriod(1L);
141 }
142 WindowsDbgHelp::pre_initialize();
143 SymbolEngine::pre_initialize();
144 break;
145 case DLL_PROCESS_DETACH:
146 if (ForceTimeHighResolution) {
147 timeEndPeriod(1L);
148 }
149 #if INCLUDE_AOT
150 if (topLevelVectoredExceptionHandler != NULL) {
151 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
152 topLevelVectoredExceptionHandler = NULL;
153 }
154 #endif
155 break;
156 default:
157 break;
158 }
159 return true;
160 }
161
162 static inline double fileTimeAsDouble(FILETIME* time) {
163 const double high = (double) ((unsigned int) ~0);
164 const double split = 10000000.0;
165 double result = (time->dwLowDateTime / split) +
166 time->dwHighDateTime * (high/split);
167 return result;
168 }
169
170 // Implementation of os
171
172 bool os::unsetenv(const char* name) {
173 assert(name != NULL, "Null pointer");
174 return (SetEnvironmentVariable(name, NULL) == TRUE);
175 }
176
177 // No setuid programs under Windows.
178 bool os::have_special_privileges() {
179 return false;
180 }
181
182
183 // This method is a periodic task to check for misbehaving JNI applications
184 // under CheckJNI, we can add any periodic checks here.
185 // For Windows at the moment does nothing
186 void os::run_periodic_checks() {
187 return;
188 }
189
190 // previous UnhandledExceptionFilter, if there is one
191 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
192
193 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
194
195 void os::init_system_properties_values() {
196 // sysclasspath, java_home, dll_dir
197 {
198 char *home_path;
199 char *dll_path;
200 char *pslash;
201 const char *bin = "\\bin";
202 char home_dir[MAX_PATH + 1];
203 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
204
205 if (alt_home_dir != NULL) {
206 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
207 home_dir[MAX_PATH] = '\0';
208 } else {
209 os::jvm_path(home_dir, sizeof(home_dir));
210 // Found the full path to jvm.dll.
211 // Now cut the path to <java_home>/jre if we can.
212 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
213 pslash = strrchr(home_dir, '\\');
214 if (pslash != NULL) {
215 *pslash = '\0'; // get rid of \{client|server}
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \bin
219 }
220 }
221 }
222
223 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
224 strcpy(home_path, home_dir);
225 Arguments::set_java_home(home_path);
226 FREE_C_HEAP_ARRAY(char, home_path);
227
228 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
229 mtInternal);
230 strcpy(dll_path, home_dir);
231 strcat(dll_path, bin);
232 Arguments::set_dll_dir(dll_path);
233 FREE_C_HEAP_ARRAY(char, dll_path);
234
235 if (!set_boot_path('\\', ';')) {
236 vm_exit_during_initialization("Failed setting boot class path.", NULL);
237 }
238 }
239
240 // library_path
241 #define EXT_DIR "\\lib\\ext"
242 #define BIN_DIR "\\bin"
243 #define PACKAGE_DIR "\\Sun\\Java"
244 {
245 // Win32 library search order (See the documentation for LoadLibrary):
246 //
247 // 1. The directory from which application is loaded.
248 // 2. The system wide Java Extensions directory (Java only)
249 // 3. System directory (GetSystemDirectory)
250 // 4. Windows directory (GetWindowsDirectory)
251 // 5. The PATH environment variable
252 // 6. The current directory
253
254 char *library_path;
255 char tmp[MAX_PATH];
256 char *path_str = ::getenv("PATH");
257
258 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
259 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
260
261 library_path[0] = '\0';
262
263 GetModuleFileName(NULL, tmp, sizeof(tmp));
264 *(strrchr(tmp, '\\')) = '\0';
265 strcat(library_path, tmp);
266
267 GetWindowsDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
270 strcat(library_path, PACKAGE_DIR BIN_DIR);
271
272 GetSystemDirectory(tmp, sizeof(tmp));
273 strcat(library_path, ";");
274 strcat(library_path, tmp);
275
276 GetWindowsDirectory(tmp, sizeof(tmp));
277 strcat(library_path, ";");
278 strcat(library_path, tmp);
279
280 if (path_str) {
281 strcat(library_path, ";");
282 strcat(library_path, path_str);
283 }
284
285 strcat(library_path, ";.");
286
287 Arguments::set_library_path(library_path);
288 FREE_C_HEAP_ARRAY(char, library_path);
289 }
290
291 // Default extensions directory
292 {
293 char path[MAX_PATH];
294 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
295 GetWindowsDirectory(path, MAX_PATH);
296 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
297 path, PACKAGE_DIR, EXT_DIR);
298 Arguments::set_ext_dirs(buf);
299 }
300 #undef EXT_DIR
301 #undef BIN_DIR
302 #undef PACKAGE_DIR
303
304 #ifndef _WIN64
305 // set our UnhandledExceptionFilter and save any previous one
306 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
307 #endif
308
309 // Done
310 return;
311 }
312
313 void os::breakpoint() {
314 DebugBreak();
315 }
316
317 // Invoked from the BREAKPOINT Macro
318 extern "C" void breakpoint() {
319 os::breakpoint();
320 }
321
322 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
323 // So far, this method is only used by Native Memory Tracking, which is
324 // only supported on Windows XP or later.
325 //
326 int os::get_native_stack(address* stack, int frames, int toSkip) {
327 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
328 for (int index = captured; index < frames; index ++) {
329 stack[index] = NULL;
330 }
331 return captured;
332 }
333
334
335 // os::current_stack_base()
336 //
337 // Returns the base of the stack, which is the stack's
338 // starting address. This function must be called
339 // while running on the stack of the thread being queried.
340
341 address os::current_stack_base() {
342 MEMORY_BASIC_INFORMATION minfo;
343 address stack_bottom;
344 size_t stack_size;
345
346 VirtualQuery(&minfo, &minfo, sizeof(minfo));
347 stack_bottom = (address)minfo.AllocationBase;
348 stack_size = minfo.RegionSize;
349
350 // Add up the sizes of all the regions with the same
351 // AllocationBase.
352 while (1) {
353 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
354 if (stack_bottom == (address)minfo.AllocationBase) {
355 stack_size += minfo.RegionSize;
356 } else {
357 break;
358 }
359 }
360 return stack_bottom + stack_size;
361 }
362
363 size_t os::current_stack_size() {
364 size_t sz;
365 MEMORY_BASIC_INFORMATION minfo;
366 VirtualQuery(&minfo, &minfo, sizeof(minfo));
367 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
368 return sz;
369 }
370
371 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
372 MEMORY_BASIC_INFORMATION minfo;
373 committed_start = NULL;
374 committed_size = 0;
375 address top = start + size;
376 const address start_addr = start;
377 while (start < top) {
378 VirtualQuery(start, &minfo, sizeof(minfo));
379 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
380 if (committed_start != NULL) {
381 break;
382 }
383 } else { // committed
384 if (committed_start == NULL) {
385 committed_start = start;
386 }
387 size_t offset = start - (address)minfo.BaseAddress;
388 committed_size += minfo.RegionSize - offset;
389 }
390 start = (address)minfo.BaseAddress + minfo.RegionSize;
391 }
392
393 if (committed_start == NULL) {
394 assert(committed_size == 0, "Sanity");
395 return false;
396 } else {
397 assert(committed_start >= start_addr && committed_start < top, "Out of range");
398 // current region may go beyond the limit, trim to the limit
399 committed_size = MIN2(committed_size, size_t(top - committed_start));
400 return true;
401 }
402 }
403
404 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
405 const struct tm* time_struct_ptr = localtime(clock);
406 if (time_struct_ptr != NULL) {
407 *res = *time_struct_ptr;
408 return res;
409 }
410 return NULL;
411 }
412
413 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
414 const struct tm* time_struct_ptr = gmtime(clock);
415 if (time_struct_ptr != NULL) {
416 *res = *time_struct_ptr;
417 return res;
418 }
419 return NULL;
420 }
421
422 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
423
424 // Thread start routine for all newly created threads
425 static unsigned __stdcall thread_native_entry(Thread* thread) {
426
427 thread->record_stack_base_and_size();
428
429 // Try to randomize the cache line index of hot stack frames.
430 // This helps when threads of the same stack traces evict each other's
431 // cache lines. The threads can be either from the same JVM instance, or
432 // from different JVM instances. The benefit is especially true for
433 // processors with hyperthreading technology.
434 static int counter = 0;
435 int pid = os::current_process_id();
436 _alloca(((pid ^ counter++) & 7) * 128);
437
438 thread->initialize_thread_current();
439
440 OSThread* osthr = thread->osthread();
441 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
442
443 if (UseNUMA) {
444 int lgrp_id = os::numa_get_group_id();
445 if (lgrp_id != -1) {
446 thread->set_lgrp_id(lgrp_id);
447 }
448 }
449
450 // Diagnostic code to investigate JDK-6573254
451 int res = 30115; // non-java thread
452 if (thread->is_Java_thread()) {
453 res = 20115; // java thread
454 }
455
456 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
457
458 // Install a win32 structured exception handler around every thread created
459 // by VM, so VM can generate error dump when an exception occurred in non-
460 // Java thread (e.g. VM thread).
461 __try {
462 thread->call_run();
463 } __except(topLevelExceptionFilter(
464 (_EXCEPTION_POINTERS*)_exception_info())) {
465 // Nothing to do.
466 }
467
468 // Note: at this point the thread object may already have deleted itself.
469 // Do not dereference it from here on out.
470
471 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
472
473 // One less thread is executing
474 // When the VMThread gets here, the main thread may have already exited
475 // which frees the CodeHeap containing the Atomic::add code
476 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
477 Atomic::dec(&os::win32::_os_thread_count);
478 }
479
480 // Thread must not return from exit_process_or_thread(), but if it does,
481 // let it proceed to exit normally
482 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
483 }
484
485 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
486 int thread_id) {
487 // Allocate the OSThread object
488 OSThread* osthread = new OSThread(NULL, NULL);
489 if (osthread == NULL) return NULL;
490
491 // Initialize the JDK library's interrupt event.
492 // This should really be done when OSThread is constructed,
493 // but there is no way for a constructor to report failure to
494 // allocate the event.
495 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
496 if (interrupt_event == NULL) {
497 delete osthread;
498 return NULL;
499 }
500 osthread->set_interrupt_event(interrupt_event);
501
502 // Store info on the Win32 thread into the OSThread
503 osthread->set_thread_handle(thread_handle);
504 osthread->set_thread_id(thread_id);
505
506 if (UseNUMA) {
507 int lgrp_id = os::numa_get_group_id();
508 if (lgrp_id != -1) {
509 thread->set_lgrp_id(lgrp_id);
510 }
511 }
512
513 // Initial thread state is INITIALIZED, not SUSPENDED
514 osthread->set_state(INITIALIZED);
515
516 return osthread;
517 }
518
519
520 bool os::create_attached_thread(JavaThread* thread) {
521 #ifdef ASSERT
522 thread->verify_not_published();
523 #endif
524 HANDLE thread_h;
525 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
526 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
527 fatal("DuplicateHandle failed\n");
528 }
529 OSThread* osthread = create_os_thread(thread, thread_h,
530 (int)current_thread_id());
531 if (osthread == NULL) {
532 return false;
533 }
534
535 // Initial thread state is RUNNABLE
536 osthread->set_state(RUNNABLE);
537
538 thread->set_osthread(osthread);
539
540 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
541 os::current_thread_id());
542
543 return true;
544 }
545
546 bool os::create_main_thread(JavaThread* thread) {
547 #ifdef ASSERT
548 thread->verify_not_published();
549 #endif
550 if (_starting_thread == NULL) {
551 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
552 if (_starting_thread == NULL) {
553 return false;
554 }
555 }
556
557 // The primordial thread is runnable from the start)
558 _starting_thread->set_state(RUNNABLE);
559
560 thread->set_osthread(_starting_thread);
561 return true;
562 }
563
564 // Helper function to trace _beginthreadex attributes,
565 // similar to os::Posix::describe_pthread_attr()
566 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
567 size_t stacksize, unsigned initflag) {
568 stringStream ss(buf, buflen);
569 if (stacksize == 0) {
570 ss.print("stacksize: default, ");
571 } else {
572 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
573 }
574 ss.print("flags: ");
575 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
576 #define ALL(X) \
577 X(CREATE_SUSPENDED) \
578 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
579 ALL(PRINT_FLAG)
580 #undef ALL
581 #undef PRINT_FLAG
582 return buf;
583 }
584
585 // Allocate and initialize a new OSThread
586 bool os::create_thread(Thread* thread, ThreadType thr_type,
587 size_t stack_size) {
588 unsigned thread_id;
589
590 // Allocate the OSThread object
591 OSThread* osthread = new OSThread(NULL, NULL);
592 if (osthread == NULL) {
593 return false;
594 }
595
596 // Initialize the JDK library's interrupt event.
597 // This should really be done when OSThread is constructed,
598 // but there is no way for a constructor to report failure to
599 // allocate the event.
600 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
601 if (interrupt_event == NULL) {
602 delete osthread;
603 return false;
604 }
605 osthread->set_interrupt_event(interrupt_event);
606 // We don't call set_interrupted(false) as it will trip the assert in there
607 // as we are not operating on the current thread. We don't need to call it
608 // because the initial state is already correct.
609
610 thread->set_osthread(osthread);
611
612 if (stack_size == 0) {
613 switch (thr_type) {
614 case os::java_thread:
615 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
616 if (JavaThread::stack_size_at_create() > 0) {
617 stack_size = JavaThread::stack_size_at_create();
618 }
619 break;
620 case os::compiler_thread:
621 if (CompilerThreadStackSize > 0) {
622 stack_size = (size_t)(CompilerThreadStackSize * K);
623 break;
624 } // else fall through:
625 // use VMThreadStackSize if CompilerThreadStackSize is not defined
626 case os::vm_thread:
627 case os::pgc_thread:
628 case os::cgc_thread:
629 case os::watcher_thread:
630 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
631 break;
632 }
633 }
634
635 // Create the Win32 thread
636 //
637 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
638 // does not specify stack size. Instead, it specifies the size of
639 // initially committed space. The stack size is determined by
640 // PE header in the executable. If the committed "stack_size" is larger
641 // than default value in the PE header, the stack is rounded up to the
642 // nearest multiple of 1MB. For example if the launcher has default
643 // stack size of 320k, specifying any size less than 320k does not
644 // affect the actual stack size at all, it only affects the initial
645 // commitment. On the other hand, specifying 'stack_size' larger than
646 // default value may cause significant increase in memory usage, because
647 // not only the stack space will be rounded up to MB, but also the
648 // entire space is committed upfront.
649 //
650 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
651 // for CreateThread() that can treat 'stack_size' as stack size. However we
652 // are not supposed to call CreateThread() directly according to MSDN
653 // document because JVM uses C runtime library. The good news is that the
654 // flag appears to work with _beginthredex() as well.
655
656 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
657 HANDLE thread_handle =
658 (HANDLE)_beginthreadex(NULL,
659 (unsigned)stack_size,
660 (unsigned (__stdcall *)(void*)) thread_native_entry,
661 thread,
662 initflag,
663 &thread_id);
664
665 char buf[64];
666 if (thread_handle != NULL) {
667 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
668 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
669 } else {
670 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
671 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
672 // Log some OS information which might explain why creating the thread failed.
673 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
674 LogStream st(Log(os, thread)::info());
675 os::print_memory_info(&st);
676 }
677
678 if (thread_handle == NULL) {
679 // Need to clean up stuff we've allocated so far
680 thread->set_osthread(NULL);
681 delete osthread;
682 return false;
683 }
684
685 Atomic::inc(&os::win32::_os_thread_count);
686
687 // Store info on the Win32 thread into the OSThread
688 osthread->set_thread_handle(thread_handle);
689 osthread->set_thread_id(thread_id);
690
691 // Initial thread state is INITIALIZED, not SUSPENDED
692 osthread->set_state(INITIALIZED);
693
694 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
695 return true;
696 }
697
698
699 // Free Win32 resources related to the OSThread
700 void os::free_thread(OSThread* osthread) {
701 assert(osthread != NULL, "osthread not set");
702
703 // We are told to free resources of the argument thread,
704 // but we can only really operate on the current thread.
705 assert(Thread::current()->osthread() == osthread,
706 "os::free_thread but not current thread");
707
708 CloseHandle(osthread->thread_handle());
709 delete osthread;
710 }
711
712 static jlong first_filetime;
713 static jlong initial_performance_count;
714 static jlong performance_frequency;
715
716
717 jlong as_long(LARGE_INTEGER x) {
718 jlong result = 0; // initialization to avoid warning
719 set_high(&result, x.HighPart);
720 set_low(&result, x.LowPart);
721 return result;
722 }
723
724
725 jlong os::elapsed_counter() {
726 LARGE_INTEGER count;
727 QueryPerformanceCounter(&count);
728 return as_long(count) - initial_performance_count;
729 }
730
731
732 jlong os::elapsed_frequency() {
733 return performance_frequency;
734 }
735
736
737 julong os::available_memory() {
738 return win32::available_memory();
739 }
740
741 julong os::win32::available_memory() {
742 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
743 // value if total memory is larger than 4GB
744 MEMORYSTATUSEX ms;
745 ms.dwLength = sizeof(ms);
746 GlobalMemoryStatusEx(&ms);
747
748 return (julong)ms.ullAvailPhys;
749 }
750
751 julong os::physical_memory() {
752 return win32::physical_memory();
753 }
754
755 bool os::has_allocatable_memory_limit(julong* limit) {
756 MEMORYSTATUSEX ms;
757 ms.dwLength = sizeof(ms);
758 GlobalMemoryStatusEx(&ms);
759 #ifdef _LP64
760 *limit = (julong)ms.ullAvailVirtual;
761 return true;
762 #else
763 // Limit to 1400m because of the 2gb address space wall
764 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
765 return true;
766 #endif
767 }
768
769 int os::active_processor_count() {
770 // User has overridden the number of active processors
771 if (ActiveProcessorCount > 0) {
772 log_trace(os)("active_processor_count: "
773 "active processor count set by user : %d",
774 ActiveProcessorCount);
775 return ActiveProcessorCount;
776 }
777
778 DWORD_PTR lpProcessAffinityMask = 0;
779 DWORD_PTR lpSystemAffinityMask = 0;
780 int proc_count = processor_count();
781 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
782 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
783 // Nof active processors is number of bits in process affinity mask
784 int bitcount = 0;
785 while (lpProcessAffinityMask != 0) {
786 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
787 bitcount++;
788 }
789 return bitcount;
790 } else {
791 return proc_count;
792 }
793 }
794
795 uint os::processor_id() {
796 return (uint)GetCurrentProcessorNumber();
797 }
798
799 void os::set_native_thread_name(const char *name) {
800
801 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
802 //
803 // Note that unfortunately this only works if the process
804 // is already attached to a debugger; debugger must observe
805 // the exception below to show the correct name.
806
807 // If there is no debugger attached skip raising the exception
808 if (!IsDebuggerPresent()) {
809 return;
810 }
811
812 const DWORD MS_VC_EXCEPTION = 0x406D1388;
813 struct {
814 DWORD dwType; // must be 0x1000
815 LPCSTR szName; // pointer to name (in user addr space)
816 DWORD dwThreadID; // thread ID (-1=caller thread)
817 DWORD dwFlags; // reserved for future use, must be zero
818 } info;
819
820 info.dwType = 0x1000;
821 info.szName = name;
822 info.dwThreadID = -1;
823 info.dwFlags = 0;
824
825 __try {
826 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
827 } __except(EXCEPTION_EXECUTE_HANDLER) {}
828 }
829
830 bool os::bind_to_processor(uint processor_id) {
831 // Not yet implemented.
832 return false;
833 }
834
835 void os::win32::initialize_performance_counter() {
836 LARGE_INTEGER count;
837 QueryPerformanceFrequency(&count);
838 performance_frequency = as_long(count);
839 QueryPerformanceCounter(&count);
840 initial_performance_count = as_long(count);
841 }
842
843
844 double os::elapsedTime() {
845 return (double) elapsed_counter() / (double) elapsed_frequency();
846 }
847
848
849 // Windows format:
850 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
851 // Java format:
852 // Java standards require the number of milliseconds since 1/1/1970
853
854 // Constant offset - calculated using offset()
855 static jlong _offset = 116444736000000000;
856 // Fake time counter for reproducible results when debugging
857 static jlong fake_time = 0;
858
859 #ifdef ASSERT
860 // Just to be safe, recalculate the offset in debug mode
861 static jlong _calculated_offset = 0;
862 static int _has_calculated_offset = 0;
863
864 jlong offset() {
865 if (_has_calculated_offset) return _calculated_offset;
866 SYSTEMTIME java_origin;
867 java_origin.wYear = 1970;
868 java_origin.wMonth = 1;
869 java_origin.wDayOfWeek = 0; // ignored
870 java_origin.wDay = 1;
871 java_origin.wHour = 0;
872 java_origin.wMinute = 0;
873 java_origin.wSecond = 0;
874 java_origin.wMilliseconds = 0;
875 FILETIME jot;
876 if (!SystemTimeToFileTime(&java_origin, &jot)) {
877 fatal("Error = %d\nWindows error", GetLastError());
878 }
879 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
880 _has_calculated_offset = 1;
881 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
882 return _calculated_offset;
883 }
884 #else
885 jlong offset() {
886 return _offset;
887 }
888 #endif
889
890 jlong windows_to_java_time(FILETIME wt) {
891 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
892 return (a - offset()) / 10000;
893 }
894
895 // Returns time ticks in (10th of micro seconds)
896 jlong windows_to_time_ticks(FILETIME wt) {
897 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
898 return (a - offset());
899 }
900
901 FILETIME java_to_windows_time(jlong l) {
902 jlong a = (l * 10000) + offset();
903 FILETIME result;
904 result.dwHighDateTime = high(a);
905 result.dwLowDateTime = low(a);
906 return result;
907 }
908
909 bool os::supports_vtime() { return true; }
910
911 double os::elapsedVTime() {
912 FILETIME created;
913 FILETIME exited;
914 FILETIME kernel;
915 FILETIME user;
916 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
917 // the resolution of windows_to_java_time() should be sufficient (ms)
918 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
919 } else {
920 return elapsedTime();
921 }
922 }
923
924 jlong os::javaTimeMillis() {
925 FILETIME wt;
926 GetSystemTimeAsFileTime(&wt);
927 return windows_to_java_time(wt);
928 }
929
930 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
931 FILETIME wt;
932 GetSystemTimeAsFileTime(&wt);
933 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
934 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
935 seconds = secs;
936 nanos = jlong(ticks - (secs*10000000)) * 100;
937 }
938
939 jlong os::javaTimeNanos() {
940 LARGE_INTEGER current_count;
941 QueryPerformanceCounter(¤t_count);
942 double current = as_long(current_count);
943 double freq = performance_frequency;
944 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
945 return time;
946 }
947
948 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
949 jlong freq = performance_frequency;
950 if (freq < NANOSECS_PER_SEC) {
951 // the performance counter is 64 bits and we will
952 // be multiplying it -- so no wrap in 64 bits
953 info_ptr->max_value = ALL_64_BITS;
954 } else if (freq > NANOSECS_PER_SEC) {
955 // use the max value the counter can reach to
956 // determine the max value which could be returned
957 julong max_counter = (julong)ALL_64_BITS;
958 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
959 } else {
960 // the performance counter is 64 bits and we will
961 // be using it directly -- so no wrap in 64 bits
962 info_ptr->max_value = ALL_64_BITS;
963 }
964
965 // using a counter, so no skipping
966 info_ptr->may_skip_backward = false;
967 info_ptr->may_skip_forward = false;
968
969 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
970 }
971
972 char* os::local_time_string(char *buf, size_t buflen) {
973 SYSTEMTIME st;
974 GetLocalTime(&st);
975 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
976 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
977 return buf;
978 }
979
980 bool os::getTimesSecs(double* process_real_time,
981 double* process_user_time,
982 double* process_system_time) {
983 HANDLE h_process = GetCurrentProcess();
984 FILETIME create_time, exit_time, kernel_time, user_time;
985 BOOL result = GetProcessTimes(h_process,
986 &create_time,
987 &exit_time,
988 &kernel_time,
989 &user_time);
990 if (result != 0) {
991 FILETIME wt;
992 GetSystemTimeAsFileTime(&wt);
993 jlong rtc_millis = windows_to_java_time(wt);
994 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
995 *process_user_time =
996 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
997 *process_system_time =
998 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
999 return true;
1000 } else {
1001 return false;
1002 }
1003 }
1004
1005 void os::shutdown() {
1006 // allow PerfMemory to attempt cleanup of any persistent resources
1007 perfMemory_exit();
1008
1009 // flush buffered output, finish log files
1010 ostream_abort();
1011
1012 // Check for abort hook
1013 abort_hook_t abort_hook = Arguments::abort_hook();
1014 if (abort_hook != NULL) {
1015 abort_hook();
1016 }
1017 }
1018
1019
1020 static HANDLE dumpFile = NULL;
1021
1022 // Check if dump file can be created.
1023 void os::check_dump_limit(char* buffer, size_t buffsz) {
1024 bool status = true;
1025 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1026 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1027 status = false;
1028 }
1029
1030 #ifndef ASSERT
1031 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1032 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1033 status = false;
1034 }
1035 #endif
1036
1037 if (status) {
1038 const char* cwd = get_current_directory(NULL, 0);
1039 int pid = current_process_id();
1040 if (cwd != NULL) {
1041 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1042 } else {
1043 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1044 }
1045
1046 if (dumpFile == NULL &&
1047 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1048 == INVALID_HANDLE_VALUE) {
1049 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1050 status = false;
1051 }
1052 }
1053 VMError::record_coredump_status(buffer, status);
1054 }
1055
1056 void os::abort(bool dump_core, void* siginfo, const void* context) {
1057 EXCEPTION_POINTERS ep;
1058 MINIDUMP_EXCEPTION_INFORMATION mei;
1059 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1060
1061 HANDLE hProcess = GetCurrentProcess();
1062 DWORD processId = GetCurrentProcessId();
1063 MINIDUMP_TYPE dumpType;
1064
1065 shutdown();
1066 if (!dump_core || dumpFile == NULL) {
1067 if (dumpFile != NULL) {
1068 CloseHandle(dumpFile);
1069 }
1070 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1071 }
1072
1073 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1074 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1075
1076 if (siginfo != NULL && context != NULL) {
1077 ep.ContextRecord = (PCONTEXT) context;
1078 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1079
1080 mei.ThreadId = GetCurrentThreadId();
1081 mei.ExceptionPointers = &ep;
1082 pmei = &mei;
1083 } else {
1084 pmei = NULL;
1085 }
1086
1087 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1088 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1089 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1090 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1091 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1092 }
1093 CloseHandle(dumpFile);
1094 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1095 }
1096
1097 // Die immediately, no exit hook, no abort hook, no cleanup.
1098 void os::die() {
1099 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1100 }
1101
1102 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1103 // * dirent_md.c 1.15 00/02/02
1104 //
1105 // The declarations for DIR and struct dirent are in jvm_win32.h.
1106
1107 // Caller must have already run dirname through JVM_NativePath, which removes
1108 // duplicate slashes and converts all instances of '/' into '\\'.
1109
1110 DIR * os::opendir(const char *dirname) {
1111 assert(dirname != NULL, "just checking"); // hotspot change
1112 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1113 DWORD fattr; // hotspot change
1114 char alt_dirname[4] = { 0, 0, 0, 0 };
1115
1116 if (dirp == 0) {
1117 errno = ENOMEM;
1118 return 0;
1119 }
1120
1121 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1122 // as a directory in FindFirstFile(). We detect this case here and
1123 // prepend the current drive name.
1124 //
1125 if (dirname[1] == '\0' && dirname[0] == '\\') {
1126 alt_dirname[0] = _getdrive() + 'A' - 1;
1127 alt_dirname[1] = ':';
1128 alt_dirname[2] = '\\';
1129 alt_dirname[3] = '\0';
1130 dirname = alt_dirname;
1131 }
1132
1133 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1134 if (dirp->path == 0) {
1135 free(dirp);
1136 errno = ENOMEM;
1137 return 0;
1138 }
1139 strcpy(dirp->path, dirname);
1140
1141 fattr = GetFileAttributes(dirp->path);
1142 if (fattr == 0xffffffff) {
1143 free(dirp->path);
1144 free(dirp);
1145 errno = ENOENT;
1146 return 0;
1147 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1148 free(dirp->path);
1149 free(dirp);
1150 errno = ENOTDIR;
1151 return 0;
1152 }
1153
1154 // Append "*.*", or possibly "\\*.*", to path
1155 if (dirp->path[1] == ':' &&
1156 (dirp->path[2] == '\0' ||
1157 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1158 // No '\\' needed for cases like "Z:" or "Z:\"
1159 strcat(dirp->path, "*.*");
1160 } else {
1161 strcat(dirp->path, "\\*.*");
1162 }
1163
1164 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1165 if (dirp->handle == INVALID_HANDLE_VALUE) {
1166 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1167 free(dirp->path);
1168 free(dirp);
1169 errno = EACCES;
1170 return 0;
1171 }
1172 }
1173 return dirp;
1174 }
1175
1176 struct dirent * os::readdir(DIR *dirp) {
1177 assert(dirp != NULL, "just checking"); // hotspot change
1178 if (dirp->handle == INVALID_HANDLE_VALUE) {
1179 return NULL;
1180 }
1181
1182 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1183
1184 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1185 if (GetLastError() == ERROR_INVALID_HANDLE) {
1186 errno = EBADF;
1187 return NULL;
1188 }
1189 FindClose(dirp->handle);
1190 dirp->handle = INVALID_HANDLE_VALUE;
1191 }
1192
1193 return &dirp->dirent;
1194 }
1195
1196 int os::closedir(DIR *dirp) {
1197 assert(dirp != NULL, "just checking"); // hotspot change
1198 if (dirp->handle != INVALID_HANDLE_VALUE) {
1199 if (!FindClose(dirp->handle)) {
1200 errno = EBADF;
1201 return -1;
1202 }
1203 dirp->handle = INVALID_HANDLE_VALUE;
1204 }
1205 free(dirp->path);
1206 free(dirp);
1207 return 0;
1208 }
1209
1210 // This must be hard coded because it's the system's temporary
1211 // directory not the java application's temp directory, ala java.io.tmpdir.
1212 const char* os::get_temp_directory() {
1213 static char path_buf[MAX_PATH];
1214 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1215 return path_buf;
1216 } else {
1217 path_buf[0] = '\0';
1218 return path_buf;
1219 }
1220 }
1221
1222 // Needs to be in os specific directory because windows requires another
1223 // header file <direct.h>
1224 const char* os::get_current_directory(char *buf, size_t buflen) {
1225 int n = static_cast<int>(buflen);
1226 if (buflen > INT_MAX) n = INT_MAX;
1227 return _getcwd(buf, n);
1228 }
1229
1230 //-----------------------------------------------------------
1231 // Helper functions for fatal error handler
1232 #ifdef _WIN64
1233 // Helper routine which returns true if address in
1234 // within the NTDLL address space.
1235 //
1236 static bool _addr_in_ntdll(address addr) {
1237 HMODULE hmod;
1238 MODULEINFO minfo;
1239
1240 hmod = GetModuleHandle("NTDLL.DLL");
1241 if (hmod == NULL) return false;
1242 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1243 &minfo, sizeof(MODULEINFO))) {
1244 return false;
1245 }
1246
1247 if ((addr >= minfo.lpBaseOfDll) &&
1248 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1249 return true;
1250 } else {
1251 return false;
1252 }
1253 }
1254 #endif
1255
1256 struct _modinfo {
1257 address addr;
1258 char* full_path; // point to a char buffer
1259 int buflen; // size of the buffer
1260 address base_addr;
1261 };
1262
1263 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1264 address top_address, void * param) {
1265 struct _modinfo *pmod = (struct _modinfo *)param;
1266 if (!pmod) return -1;
1267
1268 if (base_addr <= pmod->addr &&
1269 top_address > pmod->addr) {
1270 // if a buffer is provided, copy path name to the buffer
1271 if (pmod->full_path) {
1272 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1273 }
1274 pmod->base_addr = base_addr;
1275 return 1;
1276 }
1277 return 0;
1278 }
1279
1280 bool os::dll_address_to_library_name(address addr, char* buf,
1281 int buflen, int* offset) {
1282 // buf is not optional, but offset is optional
1283 assert(buf != NULL, "sanity check");
1284
1285 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1286 // return the full path to the DLL file, sometimes it returns path
1287 // to the corresponding PDB file (debug info); sometimes it only
1288 // returns partial path, which makes life painful.
1289
1290 struct _modinfo mi;
1291 mi.addr = addr;
1292 mi.full_path = buf;
1293 mi.buflen = buflen;
1294 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1295 // buf already contains path name
1296 if (offset) *offset = addr - mi.base_addr;
1297 return true;
1298 }
1299
1300 buf[0] = '\0';
1301 if (offset) *offset = -1;
1302 return false;
1303 }
1304
1305 bool os::dll_address_to_function_name(address addr, char *buf,
1306 int buflen, int *offset,
1307 bool demangle) {
1308 // buf is not optional, but offset is optional
1309 assert(buf != NULL, "sanity check");
1310
1311 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1312 return true;
1313 }
1314 if (offset != NULL) *offset = -1;
1315 buf[0] = '\0';
1316 return false;
1317 }
1318
1319 // save the start and end address of jvm.dll into param[0] and param[1]
1320 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1321 address top_address, void * param) {
1322 if (!param) return -1;
1323
1324 if (base_addr <= (address)_locate_jvm_dll &&
1325 top_address > (address)_locate_jvm_dll) {
1326 ((address*)param)[0] = base_addr;
1327 ((address*)param)[1] = top_address;
1328 return 1;
1329 }
1330 return 0;
1331 }
1332
1333 address vm_lib_location[2]; // start and end address of jvm.dll
1334
1335 // check if addr is inside jvm.dll
1336 bool os::address_is_in_vm(address addr) {
1337 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1338 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1339 assert(false, "Can't find jvm module.");
1340 return false;
1341 }
1342 }
1343
1344 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1345 }
1346
1347 // print module info; param is outputStream*
1348 static int _print_module(const char* fname, address base_address,
1349 address top_address, void* param) {
1350 if (!param) return -1;
1351
1352 outputStream* st = (outputStream*)param;
1353
1354 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1355 return 0;
1356 }
1357
1358 // Loads .dll/.so and
1359 // in case of error it checks if .dll/.so was built for the
1360 // same architecture as Hotspot is running on
1361 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1362 log_info(os)("attempting shared library load of %s", name);
1363
1364 void * result = LoadLibrary(name);
1365 if (result != NULL) {
1366 Events::log(NULL, "Loaded shared library %s", name);
1367 // Recalculate pdb search path if a DLL was loaded successfully.
1368 SymbolEngine::recalc_search_path();
1369 log_info(os)("shared library load of %s was successful", name);
1370 return result;
1371 }
1372 DWORD errcode = GetLastError();
1373 // Read system error message into ebuf
1374 // It may or may not be overwritten below (in the for loop and just above)
1375 lasterror(ebuf, (size_t) ebuflen);
1376 ebuf[ebuflen - 1] = '\0';
1377 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1378 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1379
1380 if (errcode == ERROR_MOD_NOT_FOUND) {
1381 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1382 ebuf[ebuflen - 1] = '\0';
1383 return NULL;
1384 }
1385
1386 // Parsing dll below
1387 // If we can read dll-info and find that dll was built
1388 // for an architecture other than Hotspot is running in
1389 // - then print to buffer "DLL was built for a different architecture"
1390 // else call os::lasterror to obtain system error message
1391 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1392 if (fd < 0) {
1393 return NULL;
1394 }
1395
1396 uint32_t signature_offset;
1397 uint16_t lib_arch = 0;
1398 bool failed_to_get_lib_arch =
1399 ( // Go to position 3c in the dll
1400 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1401 ||
1402 // Read location of signature
1403 (sizeof(signature_offset) !=
1404 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1405 ||
1406 // Go to COFF File Header in dll
1407 // that is located after "signature" (4 bytes long)
1408 (os::seek_to_file_offset(fd,
1409 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1410 ||
1411 // Read field that contains code of architecture
1412 // that dll was built for
1413 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1414 );
1415
1416 ::close(fd);
1417 if (failed_to_get_lib_arch) {
1418 // file i/o error - report os::lasterror(...) msg
1419 return NULL;
1420 }
1421
1422 typedef struct {
1423 uint16_t arch_code;
1424 char* arch_name;
1425 } arch_t;
1426
1427 static const arch_t arch_array[] = {
1428 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1429 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1430 };
1431 #if (defined _M_AMD64)
1432 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1433 #elif (defined _M_IX86)
1434 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1435 #else
1436 #error Method os::dll_load requires that one of following \
1437 is defined :_M_AMD64 or _M_IX86
1438 #endif
1439
1440
1441 // Obtain a string for printf operation
1442 // lib_arch_str shall contain string what platform this .dll was built for
1443 // running_arch_str shall string contain what platform Hotspot was built for
1444 char *running_arch_str = NULL, *lib_arch_str = NULL;
1445 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1446 if (lib_arch == arch_array[i].arch_code) {
1447 lib_arch_str = arch_array[i].arch_name;
1448 }
1449 if (running_arch == arch_array[i].arch_code) {
1450 running_arch_str = arch_array[i].arch_name;
1451 }
1452 }
1453
1454 assert(running_arch_str,
1455 "Didn't find running architecture code in arch_array");
1456
1457 // If the architecture is right
1458 // but some other error took place - report os::lasterror(...) msg
1459 if (lib_arch == running_arch) {
1460 return NULL;
1461 }
1462
1463 if (lib_arch_str != NULL) {
1464 ::_snprintf(ebuf, ebuflen - 1,
1465 "Can't load %s-bit .dll on a %s-bit platform",
1466 lib_arch_str, running_arch_str);
1467 } else {
1468 // don't know what architecture this dll was build for
1469 ::_snprintf(ebuf, ebuflen - 1,
1470 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1471 lib_arch, running_arch_str);
1472 }
1473
1474 return NULL;
1475 }
1476
1477 void os::print_dll_info(outputStream *st) {
1478 st->print_cr("Dynamic libraries:");
1479 get_loaded_modules_info(_print_module, (void *)st);
1480 }
1481
1482 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1483 HANDLE hProcess;
1484
1485 # define MAX_NUM_MODULES 128
1486 HMODULE modules[MAX_NUM_MODULES];
1487 static char filename[MAX_PATH];
1488 int result = 0;
1489
1490 int pid = os::current_process_id();
1491 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1492 FALSE, pid);
1493 if (hProcess == NULL) return 0;
1494
1495 DWORD size_needed;
1496 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1497 CloseHandle(hProcess);
1498 return 0;
1499 }
1500
1501 // number of modules that are currently loaded
1502 int num_modules = size_needed / sizeof(HMODULE);
1503
1504 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1505 // Get Full pathname:
1506 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1507 filename[0] = '\0';
1508 }
1509
1510 MODULEINFO modinfo;
1511 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1512 modinfo.lpBaseOfDll = NULL;
1513 modinfo.SizeOfImage = 0;
1514 }
1515
1516 // Invoke callback function
1517 result = callback(filename, (address)modinfo.lpBaseOfDll,
1518 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1519 if (result) break;
1520 }
1521
1522 CloseHandle(hProcess);
1523 return result;
1524 }
1525
1526 bool os::get_host_name(char* buf, size_t buflen) {
1527 DWORD size = (DWORD)buflen;
1528 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1529 }
1530
1531 void os::get_summary_os_info(char* buf, size_t buflen) {
1532 stringStream sst(buf, buflen);
1533 os::win32::print_windows_version(&sst);
1534 // chop off newline character
1535 char* nl = strchr(buf, '\n');
1536 if (nl != NULL) *nl = '\0';
1537 }
1538
1539 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1540 #if _MSC_VER >= 1900
1541 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1542 int result = ::vsnprintf(buf, len, fmt, args);
1543 // If an encoding error occurred (result < 0) then it's not clear
1544 // whether the buffer is NUL terminated, so ensure it is.
1545 if ((result < 0) && (len > 0)) {
1546 buf[len - 1] = '\0';
1547 }
1548 return result;
1549 #else
1550 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1551 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1552 // versions. However, when len == 0, avoid _vsnprintf too, and just
1553 // go straight to _vscprintf. The output is going to be truncated in
1554 // that case, except in the unusual case of empty output. More
1555 // importantly, the documentation for various versions of Visual Studio
1556 // are inconsistent about the behavior of _vsnprintf when len == 0,
1557 // including it possibly being an error.
1558 int result = -1;
1559 if (len > 0) {
1560 result = _vsnprintf(buf, len, fmt, args);
1561 // If output (including NUL terminator) is truncated, the buffer
1562 // won't be NUL terminated. Add the trailing NUL specified by C99.
1563 if ((result < 0) || ((size_t)result >= len)) {
1564 buf[len - 1] = '\0';
1565 }
1566 }
1567 if (result < 0) {
1568 result = _vscprintf(fmt, args);
1569 }
1570 return result;
1571 #endif // _MSC_VER dispatch
1572 }
1573
1574 static inline time_t get_mtime(const char* filename) {
1575 struct stat st;
1576 int ret = os::stat(filename, &st);
1577 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1578 return st.st_mtime;
1579 }
1580
1581 int os::compare_file_modified_times(const char* file1, const char* file2) {
1582 time_t t1 = get_mtime(file1);
1583 time_t t2 = get_mtime(file2);
1584 return t1 - t2;
1585 }
1586
1587 void os::print_os_info_brief(outputStream* st) {
1588 os::print_os_info(st);
1589 }
1590
1591 void os::win32::print_uptime_info(outputStream* st) {
1592 unsigned long long ticks = GetTickCount64();
1593 os::print_dhm(st, "OS uptime:", ticks/1000);
1594 }
1595
1596 void os::print_os_info(outputStream* st) {
1597 #ifdef ASSERT
1598 char buffer[1024];
1599 st->print("HostName: ");
1600 if (get_host_name(buffer, sizeof(buffer))) {
1601 st->print("%s ", buffer);
1602 } else {
1603 st->print("N/A ");
1604 }
1605 #endif
1606 st->print_cr("OS:");
1607 os::win32::print_windows_version(st);
1608
1609 os::win32::print_uptime_info(st);
1610
1611 #ifdef _LP64
1612 VM_Version::print_platform_virtualization_info(st);
1613 #endif
1614 }
1615
1616 void os::win32::print_windows_version(outputStream* st) {
1617 OSVERSIONINFOEX osvi;
1618 VS_FIXEDFILEINFO *file_info;
1619 TCHAR kernel32_path[MAX_PATH];
1620 UINT len, ret;
1621
1622 // Use the GetVersionEx information to see if we're on a server or
1623 // workstation edition of Windows. Starting with Windows 8.1 we can't
1624 // trust the OS version information returned by this API.
1625 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1626 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1627 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1628 st->print_cr("Call to GetVersionEx failed");
1629 return;
1630 }
1631 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1632
1633 // Get the full path to \Windows\System32\kernel32.dll and use that for
1634 // determining what version of Windows we're running on.
1635 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1636 ret = GetSystemDirectory(kernel32_path, len);
1637 if (ret == 0 || ret > len) {
1638 st->print_cr("Call to GetSystemDirectory failed");
1639 return;
1640 }
1641 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1642
1643 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1644 if (version_size == 0) {
1645 st->print_cr("Call to GetFileVersionInfoSize failed");
1646 return;
1647 }
1648
1649 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1650 if (version_info == NULL) {
1651 st->print_cr("Failed to allocate version_info");
1652 return;
1653 }
1654
1655 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1656 os::free(version_info);
1657 st->print_cr("Call to GetFileVersionInfo failed");
1658 return;
1659 }
1660
1661 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1662 os::free(version_info);
1663 st->print_cr("Call to VerQueryValue failed");
1664 return;
1665 }
1666
1667 int major_version = HIWORD(file_info->dwProductVersionMS);
1668 int minor_version = LOWORD(file_info->dwProductVersionMS);
1669 int build_number = HIWORD(file_info->dwProductVersionLS);
1670 int build_minor = LOWORD(file_info->dwProductVersionLS);
1671 int os_vers = major_version * 1000 + minor_version;
1672 os::free(version_info);
1673
1674 st->print(" Windows ");
1675 switch (os_vers) {
1676
1677 case 6000:
1678 if (is_workstation) {
1679 st->print("Vista");
1680 } else {
1681 st->print("Server 2008");
1682 }
1683 break;
1684
1685 case 6001:
1686 if (is_workstation) {
1687 st->print("7");
1688 } else {
1689 st->print("Server 2008 R2");
1690 }
1691 break;
1692
1693 case 6002:
1694 if (is_workstation) {
1695 st->print("8");
1696 } else {
1697 st->print("Server 2012");
1698 }
1699 break;
1700
1701 case 6003:
1702 if (is_workstation) {
1703 st->print("8.1");
1704 } else {
1705 st->print("Server 2012 R2");
1706 }
1707 break;
1708
1709 case 10000:
1710 if (is_workstation) {
1711 st->print("10");
1712 } else {
1713 // distinguish Windows Server 2016 and 2019 by build number
1714 // Windows server 2019 GA 10/2018 build number is 17763
1715 if (build_number > 17762) {
1716 st->print("Server 2019");
1717 } else {
1718 st->print("Server 2016");
1719 }
1720 }
1721 break;
1722
1723 default:
1724 // Unrecognized windows, print out its major and minor versions
1725 st->print("%d.%d", major_version, minor_version);
1726 break;
1727 }
1728
1729 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1730 // find out whether we are running on 64 bit processor or not
1731 SYSTEM_INFO si;
1732 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1733 GetNativeSystemInfo(&si);
1734 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1735 st->print(" , 64 bit");
1736 }
1737
1738 st->print(" Build %d", build_number);
1739 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1740 st->cr();
1741 }
1742
1743 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1744 // Nothing to do for now.
1745 }
1746
1747 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1748 HKEY key;
1749 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1750 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1751 if (status == ERROR_SUCCESS) {
1752 DWORD size = (DWORD)buflen;
1753 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1754 if (status != ERROR_SUCCESS) {
1755 strncpy(buf, "## __CPU__", buflen);
1756 }
1757 RegCloseKey(key);
1758 } else {
1759 // Put generic cpu info to return
1760 strncpy(buf, "## __CPU__", buflen);
1761 }
1762 }
1763
1764 void os::print_memory_info(outputStream* st) {
1765 st->print("Memory:");
1766 st->print(" %dk page", os::vm_page_size()>>10);
1767
1768 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1769 // value if total memory is larger than 4GB
1770 MEMORYSTATUSEX ms;
1771 ms.dwLength = sizeof(ms);
1772 int r1 = GlobalMemoryStatusEx(&ms);
1773
1774 if (r1 != 0) {
1775 st->print(", system-wide physical " INT64_FORMAT "M ",
1776 (int64_t) ms.ullTotalPhys >> 20);
1777 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1778
1779 st->print("TotalPageFile size " INT64_FORMAT "M ",
1780 (int64_t) ms.ullTotalPageFile >> 20);
1781 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1782 (int64_t) ms.ullAvailPageFile >> 20);
1783
1784 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1785 #if defined(_M_IX86)
1786 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1787 (int64_t) ms.ullTotalVirtual >> 20);
1788 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1789 #endif
1790 } else {
1791 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1792 }
1793
1794 // extended memory statistics for a process
1795 PROCESS_MEMORY_COUNTERS_EX pmex;
1796 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1797 pmex.cb = sizeof(pmex);
1798 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1799
1800 if (r2 != 0) {
1801 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1802 (int64_t) pmex.WorkingSetSize >> 20);
1803 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1804
1805 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1806 (int64_t) pmex.PrivateUsage >> 20);
1807 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1808 } else {
1809 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1810 }
1811
1812 st->cr();
1813 }
1814
1815 bool os::signal_sent_by_kill(const void* siginfo) {
1816 // TODO: Is this possible?
1817 return false;
1818 }
1819
1820 void os::print_siginfo(outputStream *st, const void* siginfo) {
1821 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1822 st->print("siginfo:");
1823
1824 char tmp[64];
1825 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1826 strcpy(tmp, "EXCEPTION_??");
1827 }
1828 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1829
1830 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1831 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1832 er->NumberParameters >= 2) {
1833 switch (er->ExceptionInformation[0]) {
1834 case 0: st->print(", reading address"); break;
1835 case 1: st->print(", writing address"); break;
1836 case 8: st->print(", data execution prevention violation at address"); break;
1837 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1838 er->ExceptionInformation[0]);
1839 }
1840 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1841 } else {
1842 int num = er->NumberParameters;
1843 if (num > 0) {
1844 st->print(", ExceptionInformation=");
1845 for (int i = 0; i < num; i++) {
1846 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1847 }
1848 }
1849 }
1850 st->cr();
1851 }
1852
1853 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1854 // TODO: Can we kill thread?
1855 return false;
1856 }
1857
1858 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1859 // do nothing
1860 }
1861
1862 static char saved_jvm_path[MAX_PATH] = {0};
1863
1864 // Find the full path to the current module, jvm.dll
1865 void os::jvm_path(char *buf, jint buflen) {
1866 // Error checking.
1867 if (buflen < MAX_PATH) {
1868 assert(false, "must use a large-enough buffer");
1869 buf[0] = '\0';
1870 return;
1871 }
1872 // Lazy resolve the path to current module.
1873 if (saved_jvm_path[0] != 0) {
1874 strcpy(buf, saved_jvm_path);
1875 return;
1876 }
1877
1878 buf[0] = '\0';
1879 if (Arguments::sun_java_launcher_is_altjvm()) {
1880 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1881 // for a JAVA_HOME environment variable and fix up the path so it
1882 // looks like jvm.dll is installed there (append a fake suffix
1883 // hotspot/jvm.dll).
1884 char* java_home_var = ::getenv("JAVA_HOME");
1885 if (java_home_var != NULL && java_home_var[0] != 0 &&
1886 strlen(java_home_var) < (size_t)buflen) {
1887 strncpy(buf, java_home_var, buflen);
1888
1889 // determine if this is a legacy image or modules image
1890 // modules image doesn't have "jre" subdirectory
1891 size_t len = strlen(buf);
1892 char* jrebin_p = buf + len;
1893 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1894 if (0 != _access(buf, 0)) {
1895 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1896 }
1897 len = strlen(buf);
1898 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1899 }
1900 }
1901
1902 if (buf[0] == '\0') {
1903 GetModuleFileName(vm_lib_handle, buf, buflen);
1904 }
1905 strncpy(saved_jvm_path, buf, MAX_PATH);
1906 saved_jvm_path[MAX_PATH - 1] = '\0';
1907 }
1908
1909
1910 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1911 #ifndef _WIN64
1912 st->print("_");
1913 #endif
1914 }
1915
1916
1917 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1918 #ifndef _WIN64
1919 st->print("@%d", args_size * sizeof(int));
1920 #endif
1921 }
1922
1923 // This method is a copy of JDK's sysGetLastErrorString
1924 // from src/windows/hpi/src/system_md.c
1925
1926 size_t os::lasterror(char* buf, size_t len) {
1927 DWORD errval;
1928
1929 if ((errval = GetLastError()) != 0) {
1930 // DOS error
1931 size_t n = (size_t)FormatMessage(
1932 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1933 NULL,
1934 errval,
1935 0,
1936 buf,
1937 (DWORD)len,
1938 NULL);
1939 if (n > 3) {
1940 // Drop final '.', CR, LF
1941 if (buf[n - 1] == '\n') n--;
1942 if (buf[n - 1] == '\r') n--;
1943 if (buf[n - 1] == '.') n--;
1944 buf[n] = '\0';
1945 }
1946 return n;
1947 }
1948
1949 if (errno != 0) {
1950 // C runtime error that has no corresponding DOS error code
1951 const char* s = os::strerror(errno);
1952 size_t n = strlen(s);
1953 if (n >= len) n = len - 1;
1954 strncpy(buf, s, n);
1955 buf[n] = '\0';
1956 return n;
1957 }
1958
1959 return 0;
1960 }
1961
1962 int os::get_last_error() {
1963 DWORD error = GetLastError();
1964 if (error == 0) {
1965 error = errno;
1966 }
1967 return (int)error;
1968 }
1969
1970 // sun.misc.Signal
1971 // NOTE that this is a workaround for an apparent kernel bug where if
1972 // a signal handler for SIGBREAK is installed then that signal handler
1973 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1974 // See bug 4416763.
1975 static void (*sigbreakHandler)(int) = NULL;
1976
1977 static void UserHandler(int sig, void *siginfo, void *context) {
1978 os::signal_notify(sig);
1979 // We need to reinstate the signal handler each time...
1980 os::signal(sig, (void*)UserHandler);
1981 }
1982
1983 void* os::user_handler() {
1984 return (void*) UserHandler;
1985 }
1986
1987 void* os::signal(int signal_number, void* handler) {
1988 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1989 void (*oldHandler)(int) = sigbreakHandler;
1990 sigbreakHandler = (void (*)(int)) handler;
1991 return (void*) oldHandler;
1992 } else {
1993 return (void*)::signal(signal_number, (void (*)(int))handler);
1994 }
1995 }
1996
1997 void os::signal_raise(int signal_number) {
1998 raise(signal_number);
1999 }
2000
2001 // The Win32 C runtime library maps all console control events other than ^C
2002 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2003 // logoff, and shutdown events. We therefore install our own console handler
2004 // that raises SIGTERM for the latter cases.
2005 //
2006 static BOOL WINAPI consoleHandler(DWORD event) {
2007 switch (event) {
2008 case CTRL_C_EVENT:
2009 if (VMError::is_error_reported()) {
2010 // Ctrl-C is pressed during error reporting, likely because the error
2011 // handler fails to abort. Let VM die immediately.
2012 os::die();
2013 }
2014
2015 os::signal_raise(SIGINT);
2016 return TRUE;
2017 break;
2018 case CTRL_BREAK_EVENT:
2019 if (sigbreakHandler != NULL) {
2020 (*sigbreakHandler)(SIGBREAK);
2021 }
2022 return TRUE;
2023 break;
2024 case CTRL_LOGOFF_EVENT: {
2025 // Don't terminate JVM if it is running in a non-interactive session,
2026 // such as a service process.
2027 USEROBJECTFLAGS flags;
2028 HANDLE handle = GetProcessWindowStation();
2029 if (handle != NULL &&
2030 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2031 sizeof(USEROBJECTFLAGS), NULL)) {
2032 // If it is a non-interactive session, let next handler to deal
2033 // with it.
2034 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2035 return FALSE;
2036 }
2037 }
2038 }
2039 case CTRL_CLOSE_EVENT:
2040 case CTRL_SHUTDOWN_EVENT:
2041 os::signal_raise(SIGTERM);
2042 return TRUE;
2043 break;
2044 default:
2045 break;
2046 }
2047 return FALSE;
2048 }
2049
2050 // The following code is moved from os.cpp for making this
2051 // code platform specific, which it is by its very nature.
2052
2053 // Return maximum OS signal used + 1 for internal use only
2054 // Used as exit signal for signal_thread
2055 int os::sigexitnum_pd() {
2056 return NSIG;
2057 }
2058
2059 // a counter for each possible signal value, including signal_thread exit signal
2060 static volatile jint pending_signals[NSIG+1] = { 0 };
2061 static Semaphore* sig_sem = NULL;
2062
2063 static void jdk_misc_signal_init() {
2064 // Initialize signal structures
2065 memset((void*)pending_signals, 0, sizeof(pending_signals));
2066
2067 // Initialize signal semaphore
2068 sig_sem = new Semaphore();
2069
2070 // Programs embedding the VM do not want it to attempt to receive
2071 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2072 // shutdown hooks mechanism introduced in 1.3. For example, when
2073 // the VM is run as part of a Windows NT service (i.e., a servlet
2074 // engine in a web server), the correct behavior is for any console
2075 // control handler to return FALSE, not TRUE, because the OS's
2076 // "final" handler for such events allows the process to continue if
2077 // it is a service (while terminating it if it is not a service).
2078 // To make this behavior uniform and the mechanism simpler, we
2079 // completely disable the VM's usage of these console events if -Xrs
2080 // (=ReduceSignalUsage) is specified. This means, for example, that
2081 // the CTRL-BREAK thread dump mechanism is also disabled in this
2082 // case. See bugs 4323062, 4345157, and related bugs.
2083
2084 // Add a CTRL-C handler
2085 SetConsoleCtrlHandler(consoleHandler, TRUE);
2086 }
2087
2088 void os::signal_notify(int sig) {
2089 if (sig_sem != NULL) {
2090 Atomic::inc(&pending_signals[sig]);
2091 sig_sem->signal();
2092 } else {
2093 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2094 // initialization isn't called.
2095 assert(ReduceSignalUsage, "signal semaphore should be created");
2096 }
2097 }
2098
2099 static int check_pending_signals() {
2100 while (true) {
2101 for (int i = 0; i < NSIG + 1; i++) {
2102 jint n = pending_signals[i];
2103 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
2104 return i;
2105 }
2106 }
2107 JavaThread *thread = JavaThread::current();
2108
2109 ThreadBlockInVM tbivm(thread);
2110
2111 bool threadIsSuspended;
2112 do {
2113 thread->set_suspend_equivalent();
2114 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2115 sig_sem->wait();
2116
2117 // were we externally suspended while we were waiting?
2118 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2119 if (threadIsSuspended) {
2120 // The semaphore has been incremented, but while we were waiting
2121 // another thread suspended us. We don't want to continue running
2122 // while suspended because that would surprise the thread that
2123 // suspended us.
2124 sig_sem->signal();
2125
2126 thread->java_suspend_self();
2127 }
2128 } while (threadIsSuspended);
2129 }
2130 }
2131
2132 int os::signal_wait() {
2133 return check_pending_signals();
2134 }
2135
2136 // Implicit OS exception handling
2137
2138 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2139 address handler) {
2140 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2141 // Save pc in thread
2142 #ifdef _M_AMD64
2143 // Do not blow up if no thread info available.
2144 if (thread) {
2145 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2146 }
2147 // Set pc to handler
2148 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2149 #else
2150 // Do not blow up if no thread info available.
2151 if (thread) {
2152 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2153 }
2154 // Set pc to handler
2155 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2156 #endif
2157
2158 // Continue the execution
2159 return EXCEPTION_CONTINUE_EXECUTION;
2160 }
2161
2162
2163 // Used for PostMortemDump
2164 extern "C" void safepoints();
2165 extern "C" void find(int x);
2166 extern "C" void events();
2167
2168 // According to Windows API documentation, an illegal instruction sequence should generate
2169 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2170 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2171 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2172
2173 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2174
2175 // From "Execution Protection in the Windows Operating System" draft 0.35
2176 // Once a system header becomes available, the "real" define should be
2177 // included or copied here.
2178 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2179
2180 // Windows Vista/2008 heap corruption check
2181 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2182
2183 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2184 // C++ compiler contain this error code. Because this is a compiler-generated
2185 // error, the code is not listed in the Win32 API header files.
2186 // The code is actually a cryptic mnemonic device, with the initial "E"
2187 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2188 // ASCII values of "msc".
2189
2190 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2191
2192 #define def_excpt(val) { #val, (val) }
2193
2194 static const struct { const char* name; uint number; } exceptlabels[] = {
2195 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2196 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2197 def_excpt(EXCEPTION_BREAKPOINT),
2198 def_excpt(EXCEPTION_SINGLE_STEP),
2199 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2200 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2201 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2202 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2203 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2204 def_excpt(EXCEPTION_FLT_OVERFLOW),
2205 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2206 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2207 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2208 def_excpt(EXCEPTION_INT_OVERFLOW),
2209 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2210 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2211 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2212 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2213 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2214 def_excpt(EXCEPTION_STACK_OVERFLOW),
2215 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2216 def_excpt(EXCEPTION_GUARD_PAGE),
2217 def_excpt(EXCEPTION_INVALID_HANDLE),
2218 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2219 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2220 };
2221
2222 #undef def_excpt
2223
2224 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2225 uint code = static_cast<uint>(exception_code);
2226 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2227 if (exceptlabels[i].number == code) {
2228 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2229 return buf;
2230 }
2231 }
2232
2233 return NULL;
2234 }
2235
2236 //-----------------------------------------------------------------------------
2237 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2238 // handle exception caused by idiv; should only happen for -MinInt/-1
2239 // (division by zero is handled explicitly)
2240 #ifdef _M_AMD64
2241 PCONTEXT ctx = exceptionInfo->ContextRecord;
2242 address pc = (address)ctx->Rip;
2243 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2244 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2245 if (pc[0] == 0xF7) {
2246 // set correct result values and continue after idiv instruction
2247 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2248 } else {
2249 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2250 }
2251 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2252 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2253 // idiv opcode (0xF7).
2254 ctx->Rdx = (DWORD)0; // remainder
2255 // Continue the execution
2256 #else
2257 PCONTEXT ctx = exceptionInfo->ContextRecord;
2258 address pc = (address)ctx->Eip;
2259 assert(pc[0] == 0xF7, "not an idiv opcode");
2260 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2261 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2262 // set correct result values and continue after idiv instruction
2263 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2264 ctx->Eax = (DWORD)min_jint; // result
2265 ctx->Edx = (DWORD)0; // remainder
2266 // Continue the execution
2267 #endif
2268 return EXCEPTION_CONTINUE_EXECUTION;
2269 }
2270
2271 //-----------------------------------------------------------------------------
2272 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2273 PCONTEXT ctx = exceptionInfo->ContextRecord;
2274 #ifndef _WIN64
2275 // handle exception caused by native method modifying control word
2276 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2277
2278 switch (exception_code) {
2279 case EXCEPTION_FLT_DENORMAL_OPERAND:
2280 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2281 case EXCEPTION_FLT_INEXACT_RESULT:
2282 case EXCEPTION_FLT_INVALID_OPERATION:
2283 case EXCEPTION_FLT_OVERFLOW:
2284 case EXCEPTION_FLT_STACK_CHECK:
2285 case EXCEPTION_FLT_UNDERFLOW:
2286 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2287 if (fp_control_word != ctx->FloatSave.ControlWord) {
2288 // Restore FPCW and mask out FLT exceptions
2289 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2290 // Mask out pending FLT exceptions
2291 ctx->FloatSave.StatusWord &= 0xffffff00;
2292 return EXCEPTION_CONTINUE_EXECUTION;
2293 }
2294 }
2295
2296 if (prev_uef_handler != NULL) {
2297 // We didn't handle this exception so pass it to the previous
2298 // UnhandledExceptionFilter.
2299 return (prev_uef_handler)(exceptionInfo);
2300 }
2301 #else // !_WIN64
2302 // On Windows, the mxcsr control bits are non-volatile across calls
2303 // See also CR 6192333
2304 //
2305 jint MxCsr = INITIAL_MXCSR;
2306 // we can't use StubRoutines::addr_mxcsr_std()
2307 // because in Win64 mxcsr is not saved there
2308 if (MxCsr != ctx->MxCsr) {
2309 ctx->MxCsr = MxCsr;
2310 return EXCEPTION_CONTINUE_EXECUTION;
2311 }
2312 #endif // !_WIN64
2313
2314 return EXCEPTION_CONTINUE_SEARCH;
2315 }
2316
2317 static inline void report_error(Thread* t, DWORD exception_code,
2318 address addr, void* siginfo, void* context) {
2319 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2320
2321 // If UseOsErrorReporting, this will return here and save the error file
2322 // somewhere where we can find it in the minidump.
2323 }
2324
2325 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2326 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2327 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2328 address addr = (address) exceptionRecord->ExceptionInformation[1];
2329 if (Interpreter::contains(pc)) {
2330 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2331 if (!fr->is_first_java_frame()) {
2332 // get_frame_at_stack_banging_point() is only called when we
2333 // have well defined stacks so java_sender() calls do not need
2334 // to assert safe_for_sender() first.
2335 *fr = fr->java_sender();
2336 }
2337 } else {
2338 // more complex code with compiled code
2339 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2340 CodeBlob* cb = CodeCache::find_blob(pc);
2341 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2342 // Not sure where the pc points to, fallback to default
2343 // stack overflow handling
2344 return false;
2345 } else {
2346 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2347 // in compiled code, the stack banging is performed just after the return pc
2348 // has been pushed on the stack
2349 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2350 if (!fr->is_java_frame()) {
2351 // See java_sender() comment above.
2352 *fr = fr->java_sender();
2353 }
2354 }
2355 }
2356 assert(fr->is_java_frame(), "Safety check");
2357 return true;
2358 }
2359
2360 #if INCLUDE_AOT
2361 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2362 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2363 address addr = (address) exceptionRecord->ExceptionInformation[1];
2364 address pc = (address) exceptionInfo->ContextRecord->Rip;
2365
2366 // Handle the case where we get an implicit exception in AOT generated
2367 // code. AOT DLL's loaded are not registered for structured exceptions.
2368 // If the exception occurred in the codeCache or AOT code, pass control
2369 // to our normal exception handler.
2370 CodeBlob* cb = CodeCache::find_blob(pc);
2371 if (cb != NULL) {
2372 return topLevelExceptionFilter(exceptionInfo);
2373 }
2374
2375 return EXCEPTION_CONTINUE_SEARCH;
2376 }
2377 #endif
2378
2379 //-----------------------------------------------------------------------------
2380 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2381 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2382 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2383 #ifdef _M_AMD64
2384 address pc = (address) exceptionInfo->ContextRecord->Rip;
2385 #else
2386 address pc = (address) exceptionInfo->ContextRecord->Eip;
2387 #endif
2388 Thread* t = Thread::current_or_null_safe();
2389
2390 // Handle SafeFetch32 and SafeFetchN exceptions.
2391 if (StubRoutines::is_safefetch_fault(pc)) {
2392 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2393 }
2394
2395 #ifndef _WIN64
2396 // Execution protection violation - win32 running on AMD64 only
2397 // Handled first to avoid misdiagnosis as a "normal" access violation;
2398 // This is safe to do because we have a new/unique ExceptionInformation
2399 // code for this condition.
2400 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2401 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2402 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2403 address addr = (address) exceptionRecord->ExceptionInformation[1];
2404
2405 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2406 int page_size = os::vm_page_size();
2407
2408 // Make sure the pc and the faulting address are sane.
2409 //
2410 // If an instruction spans a page boundary, and the page containing
2411 // the beginning of the instruction is executable but the following
2412 // page is not, the pc and the faulting address might be slightly
2413 // different - we still want to unguard the 2nd page in this case.
2414 //
2415 // 15 bytes seems to be a (very) safe value for max instruction size.
2416 bool pc_is_near_addr =
2417 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2418 bool instr_spans_page_boundary =
2419 (align_down((intptr_t) pc ^ (intptr_t) addr,
2420 (intptr_t) page_size) > 0);
2421
2422 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2423 static volatile address last_addr =
2424 (address) os::non_memory_address_word();
2425
2426 // In conservative mode, don't unguard unless the address is in the VM
2427 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2428 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2429
2430 // Set memory to RWX and retry
2431 address page_start = align_down(addr, page_size);
2432 bool res = os::protect_memory((char*) page_start, page_size,
2433 os::MEM_PROT_RWX);
2434
2435 log_debug(os)("Execution protection violation "
2436 "at " INTPTR_FORMAT
2437 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2438 p2i(page_start), (res ? "success" : os::strerror(errno)));
2439
2440 // Set last_addr so if we fault again at the same address, we don't
2441 // end up in an endless loop.
2442 //
2443 // There are two potential complications here. Two threads trapping
2444 // at the same address at the same time could cause one of the
2445 // threads to think it already unguarded, and abort the VM. Likely
2446 // very rare.
2447 //
2448 // The other race involves two threads alternately trapping at
2449 // different addresses and failing to unguard the page, resulting in
2450 // an endless loop. This condition is probably even more unlikely
2451 // than the first.
2452 //
2453 // Although both cases could be avoided by using locks or thread
2454 // local last_addr, these solutions are unnecessary complication:
2455 // this handler is a best-effort safety net, not a complete solution.
2456 // It is disabled by default and should only be used as a workaround
2457 // in case we missed any no-execute-unsafe VM code.
2458
2459 last_addr = addr;
2460
2461 return EXCEPTION_CONTINUE_EXECUTION;
2462 }
2463 }
2464
2465 // Last unguard failed or not unguarding
2466 tty->print_raw_cr("Execution protection violation");
2467 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2468 exceptionInfo->ContextRecord);
2469 return EXCEPTION_CONTINUE_SEARCH;
2470 }
2471 }
2472 #endif // _WIN64
2473
2474 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2475 VM_Version::is_cpuinfo_segv_addr(pc)) {
2476 // Verify that OS save/restore AVX registers.
2477 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2478 }
2479
2480 if (t != NULL && t->is_Java_thread()) {
2481 JavaThread* thread = (JavaThread*) t;
2482 bool in_java = thread->thread_state() == _thread_in_Java;
2483
2484 // Handle potential stack overflows up front.
2485 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2486 if (thread->stack_guards_enabled()) {
2487 if (in_java) {
2488 frame fr;
2489 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2490 address addr = (address) exceptionRecord->ExceptionInformation[1];
2491 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2492 assert(fr.is_java_frame(), "Must be a Java frame");
2493 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2494 }
2495 }
2496 // Yellow zone violation. The o/s has unprotected the first yellow
2497 // zone page for us. Note: must call disable_stack_yellow_zone to
2498 // update the enabled status, even if the zone contains only one page.
2499 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2500 thread->disable_stack_yellow_reserved_zone();
2501 // If not in java code, return and hope for the best.
2502 return in_java
2503 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2504 : EXCEPTION_CONTINUE_EXECUTION;
2505 } else {
2506 // Fatal red zone violation.
2507 thread->disable_stack_red_zone();
2508 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2509 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2510 exceptionInfo->ContextRecord);
2511 return EXCEPTION_CONTINUE_SEARCH;
2512 }
2513 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2514 // Either stack overflow or null pointer exception.
2515 if (in_java) {
2516 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2517 address addr = (address) exceptionRecord->ExceptionInformation[1];
2518 address stack_end = thread->stack_end();
2519 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2520 // Stack overflow.
2521 assert(!os::uses_stack_guard_pages(),
2522 "should be caught by red zone code above.");
2523 return Handle_Exception(exceptionInfo,
2524 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2525 }
2526 // Check for safepoint polling and implicit null
2527 // We only expect null pointers in the stubs (vtable)
2528 // the rest are checked explicitly now.
2529 CodeBlob* cb = CodeCache::find_blob(pc);
2530 if (cb != NULL) {
2531 if (SafepointMechanism::is_poll_address(addr)) {
2532 address stub = SharedRuntime::get_poll_stub(pc);
2533 return Handle_Exception(exceptionInfo, stub);
2534 }
2535 }
2536 {
2537 #ifdef _WIN64
2538 // If it's a legal stack address map the entire region in
2539 //
2540 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2541 address addr = (address) exceptionRecord->ExceptionInformation[1];
2542 if (thread->is_in_usable_stack(addr)) {
2543 addr = (address)((uintptr_t)addr &
2544 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2545 os::commit_memory((char *)addr, thread->stack_base() - addr,
2546 !ExecMem);
2547 return EXCEPTION_CONTINUE_EXECUTION;
2548 } else
2549 #endif
2550 {
2551 // Null pointer exception.
2552 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2553 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2554 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2555 }
2556 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2557 exceptionInfo->ContextRecord);
2558 return EXCEPTION_CONTINUE_SEARCH;
2559 }
2560 }
2561 }
2562
2563 #ifdef _WIN64
2564 // Special care for fast JNI field accessors.
2565 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2566 // in and the heap gets shrunk before the field access.
2567 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2568 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2569 if (addr != (address)-1) {
2570 return Handle_Exception(exceptionInfo, addr);
2571 }
2572 }
2573 #endif
2574
2575 // Stack overflow or null pointer exception in native code.
2576 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2577 exceptionInfo->ContextRecord);
2578 return EXCEPTION_CONTINUE_SEARCH;
2579 } // /EXCEPTION_ACCESS_VIOLATION
2580 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2581
2582 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2583 CompiledMethod* nm = NULL;
2584 JavaThread* thread = (JavaThread*)t;
2585 if (in_java) {
2586 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2587 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2588 }
2589
2590 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2591 if (((thread->thread_state() == _thread_in_vm ||
2592 thread->thread_state() == _thread_in_native ||
2593 is_unsafe_arraycopy) &&
2594 thread->doing_unsafe_access()) ||
2595 (nm != NULL && nm->has_unsafe_access())) {
2596 address next_pc = Assembler::locate_next_instruction(pc);
2597 if (is_unsafe_arraycopy) {
2598 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2599 }
2600 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2601 }
2602 }
2603
2604 if (in_java) {
2605 switch (exception_code) {
2606 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2607 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2608
2609 case EXCEPTION_INT_OVERFLOW:
2610 return Handle_IDiv_Exception(exceptionInfo);
2611
2612 } // switch
2613 }
2614 if (((thread->thread_state() == _thread_in_Java) ||
2615 (thread->thread_state() == _thread_in_native)) &&
2616 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2617 LONG result=Handle_FLT_Exception(exceptionInfo);
2618 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2619 }
2620 }
2621
2622 if (exception_code != EXCEPTION_BREAKPOINT) {
2623 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2624 exceptionInfo->ContextRecord);
2625 }
2626 return EXCEPTION_CONTINUE_SEARCH;
2627 }
2628
2629 #ifndef _WIN64
2630 // Special care for fast JNI accessors.
2631 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2632 // the heap gets shrunk before the field access.
2633 // Need to install our own structured exception handler since native code may
2634 // install its own.
2635 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2636 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2637 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2638 address pc = (address) exceptionInfo->ContextRecord->Eip;
2639 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2640 if (addr != (address)-1) {
2641 return Handle_Exception(exceptionInfo, addr);
2642 }
2643 }
2644 return EXCEPTION_CONTINUE_SEARCH;
2645 }
2646
2647 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2648 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2649 jobject obj, \
2650 jfieldID fieldID) { \
2651 __try { \
2652 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2653 obj, \
2654 fieldID); \
2655 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2656 _exception_info())) { \
2657 } \
2658 return 0; \
2659 }
2660
2661 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2662 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2663 DEFINE_FAST_GETFIELD(jchar, char, Char)
2664 DEFINE_FAST_GETFIELD(jshort, short, Short)
2665 DEFINE_FAST_GETFIELD(jint, int, Int)
2666 DEFINE_FAST_GETFIELD(jlong, long, Long)
2667 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2668 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2669
2670 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2671 switch (type) {
2672 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2673 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2674 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2675 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2676 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2677 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2678 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2679 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2680 default: ShouldNotReachHere();
2681 }
2682 return (address)-1;
2683 }
2684 #endif
2685
2686 // Virtual Memory
2687
2688 int os::vm_page_size() { return os::win32::vm_page_size(); }
2689 int os::vm_allocation_granularity() {
2690 return os::win32::vm_allocation_granularity();
2691 }
2692
2693 // Windows large page support is available on Windows 2003. In order to use
2694 // large page memory, the administrator must first assign additional privilege
2695 // to the user:
2696 // + select Control Panel -> Administrative Tools -> Local Security Policy
2697 // + select Local Policies -> User Rights Assignment
2698 // + double click "Lock pages in memory", add users and/or groups
2699 // + reboot
2700 // Note the above steps are needed for administrator as well, as administrators
2701 // by default do not have the privilege to lock pages in memory.
2702 //
2703 // Note about Windows 2003: although the API supports committing large page
2704 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2705 // scenario, I found through experiment it only uses large page if the entire
2706 // memory region is reserved and committed in a single VirtualAlloc() call.
2707 // This makes Windows large page support more or less like Solaris ISM, in
2708 // that the entire heap must be committed upfront. This probably will change
2709 // in the future, if so the code below needs to be revisited.
2710
2711 #ifndef MEM_LARGE_PAGES
2712 #define MEM_LARGE_PAGES 0x20000000
2713 #endif
2714
2715 #define VirtualFreeChecked(mem, size, type) \
2716 do { \
2717 bool ret = VirtualFree(mem, size, type); \
2718 assert(ret, "Failed to free memory: " PTR_FORMAT, p2i(mem)); \
2719 } while (false)
2720
2721 // The number of bytes is setup to match 1 pixel and 32 bits per pixel.
2722 static const int gdi_tiny_bitmap_width_bytes = 4;
2723
2724 static HBITMAP gdi_create_tiny_bitmap(void* mem) {
2725 // The documentation for CreateBitmap states a word-alignment requirement.
2726 STATIC_ASSERT(is_aligned_(gdi_tiny_bitmap_width_bytes, sizeof(WORD)));
2727
2728 // Some callers use this function to test if memory crossing separate memory
2729 // reservations can be used. Create a height of 2 to make sure that one pixel
2730 // ends up in the first reservation and the other in the second.
2731 int nHeight = 2;
2732
2733 assert(is_aligned(mem, gdi_tiny_bitmap_width_bytes), "Incorrect alignment");
2734
2735 // Width is one pixel and correlates with gdi_tiny_bitmap_width_bytes.
2736 int nWidth = 1;
2737
2738 // Calculate bit count - will be 32.
2739 UINT nBitCount = gdi_tiny_bitmap_width_bytes / nWidth * BitsPerByte;
2740
2741 return CreateBitmap(
2742 nWidth,
2743 nHeight,
2744 1, // nPlanes
2745 nBitCount,
2746 mem); // lpBits
2747 }
2748
2749 // It has been found that some of the GDI functions fail under these two situations:
2750 // 1) When used with large pages
2751 // 2) When mem crosses the boundary between two separate memory reservations.
2752 //
2753 // This is a small test used to see if the current GDI implementation is
2754 // susceptible to any of these problems.
2755 static bool gdi_can_use_memory(void* mem) {
2756 HBITMAP bitmap = gdi_create_tiny_bitmap(mem);
2757 if (bitmap != NULL) {
2758 DeleteObject(bitmap);
2759 return true;
2760 }
2761
2762 // Verify that the bitmap could be created with a normal page.
2763 // If this fails, the testing method above isn't reliable.
2764 #ifdef ASSERT
2765 void* verify_mem = ::malloc(4 * 1024);
2766 HBITMAP verify_bitmap = gdi_create_tiny_bitmap(verify_mem);
2767 if (verify_bitmap == NULL) {
2768 fatal("Couldn't create test bitmap with malloced memory");
2769 } else {
2770 DeleteObject(verify_bitmap);
2771 }
2772 ::free(verify_mem);
2773 #endif
2774
2775 return false;
2776 }
2777
2778 // Test if GDI functions work when memory spans
2779 // two adjacent memory reservations.
2780 static bool gdi_can_use_split_reservation_memory(bool use_large_pages, size_t granule) {
2781 DWORD mem_large_pages = use_large_pages ? MEM_LARGE_PAGES : 0;
2782
2783 // Find virtual memory range. Two granules for regions and one for alignment.
2784 void* reserved = VirtualAlloc(NULL,
2785 granule * 3,
2786 MEM_RESERVE,
2787 PAGE_NOACCESS);
2788 if (reserved == NULL) {
2789 // Can't proceed with test - pessimistically report false
2790 return false;
2791 }
2792 VirtualFreeChecked(reserved, 0, MEM_RELEASE);
2793
2794 // Ensure proper alignment
2795 void* res0 = align_up(reserved, granule);
2796 void* res1 = (char*)res0 + granule;
2797
2798 // Reserve and commit the first part
2799 void* mem0 = VirtualAlloc(res0,
2800 granule,
2801 MEM_RESERVE|MEM_COMMIT|mem_large_pages,
2802 PAGE_READWRITE);
2803 if (mem0 != res0) {
2804 // Can't proceed with test - pessimistically report false
2805 return false;
2806 }
2807
2808 // Reserve and commit the second part
2809 void* mem1 = VirtualAlloc(res1,
2810 granule,
2811 MEM_RESERVE|MEM_COMMIT|mem_large_pages,
2812 PAGE_READWRITE);
2813 if (mem1 != res1) {
2814 VirtualFreeChecked(mem0, 0, MEM_RELEASE);
2815 // Can't proceed with test - pessimistically report false
2816 return false;
2817 }
2818
2819 // Set the bitmap's bits to point one "width" bytes before, so that
2820 // the bitmap extends across the reservation boundary.
2821 void* bitmapBits = (char*)mem1 - gdi_tiny_bitmap_width_bytes;
2822
2823 bool success = gdi_can_use_memory(bitmapBits);
2824
2825 VirtualFreeChecked(mem1, 0, MEM_RELEASE);
2826 VirtualFreeChecked(mem0, 0, MEM_RELEASE);
2827
2828 return success;
2829 }
2830
2831 // Container for NUMA node list info
2832 class NUMANodeListHolder {
2833 private:
2834 int *_numa_used_node_list; // allocated below
2835 int _numa_used_node_count;
2836
2837 void free_node_list() {
2838 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2839 }
2840
2841 public:
2842 NUMANodeListHolder() {
2843 _numa_used_node_count = 0;
2844 _numa_used_node_list = NULL;
2845 // do rest of initialization in build routine (after function pointers are set up)
2846 }
2847
2848 ~NUMANodeListHolder() {
2849 free_node_list();
2850 }
2851
2852 bool build() {
2853 DWORD_PTR proc_aff_mask;
2854 DWORD_PTR sys_aff_mask;
2855 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2856 ULONG highest_node_number;
2857 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2858 free_node_list();
2859 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2860 for (unsigned int i = 0; i <= highest_node_number; i++) {
2861 ULONGLONG proc_mask_numa_node;
2862 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2863 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2864 _numa_used_node_list[_numa_used_node_count++] = i;
2865 }
2866 }
2867 return (_numa_used_node_count > 1);
2868 }
2869
2870 int get_count() { return _numa_used_node_count; }
2871 int get_node_list_entry(int n) {
2872 // for indexes out of range, returns -1
2873 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2874 }
2875
2876 } numa_node_list_holder;
2877
2878 static size_t _large_page_size = 0;
2879
2880 static bool request_lock_memory_privilege() {
2881 HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2882 os::current_process_id());
2883
2884 bool success = false;
2885 HANDLE hToken = NULL;
2886 LUID luid;
2887 if (hProcess != NULL &&
2888 OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &hToken) &&
2889 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2890
2891 TOKEN_PRIVILEGES tp;
2892 tp.PrivilegeCount = 1;
2893 tp.Privileges[0].Luid = luid;
2894 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2895
2896 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2897 // privilege. Check GetLastError() too. See MSDN document.
2898 if (AdjustTokenPrivileges(hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2899 (GetLastError() == ERROR_SUCCESS)) {
2900 success = true;
2901 }
2902 }
2903
2904 // Cleanup
2905 if (hProcess != NULL) {
2906 CloseHandle(hProcess);
2907 }
2908 if (hToken != NULL) {
2909 CloseHandle(hToken);
2910 }
2911
2912 return success;
2913 }
2914
2915 static bool numa_interleaving_init() {
2916 bool success = false;
2917
2918 // print a warning if UseNUMAInterleaving flag is specified on command line
2919 bool warn_on_failure = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2920
2921 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2922
2923 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2924 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2925 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2926
2927 if (!numa_node_list_holder.build()) {
2928 WARN("Process does not cover multiple NUMA nodes.");
2929 WARN("...Ignoring UseNUMAInterleaving flag.");
2930 return false;
2931 }
2932
2933 if (!gdi_can_use_split_reservation_memory(UseLargePages, min_interleave_granularity)) {
2934 WARN("Windows GDI cannot handle split reservations.");
2935 WARN("...Ignoring UseNUMAInterleaving flag.");
2936 return false;
2937 }
2938
2939 if (log_is_enabled(Debug, os, cpu)) {
2940 Log(os, cpu) log;
2941 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2942 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2943 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2944 }
2945 }
2946
2947 #undef WARN
2948
2949 return true;
2950 }
2951
2952 // this routine is used whenever we need to reserve a contiguous VA range
2953 // but we need to make separate VirtualAlloc calls for each piece of the range
2954 // Reasons for doing this:
2955 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2956 // * UseNUMAInterleaving requires a separate node for each piece
2957 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2958 DWORD prot,
2959 bool should_inject_error = false) {
2960 char * p_buf;
2961 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2962 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2963 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2964
2965 // first reserve enough address space in advance since we want to be
2966 // able to break a single contiguous virtual address range into multiple
2967 // large page commits but WS2003 does not allow reserving large page space
2968 // so we just use 4K pages for reserve, this gives us a legal contiguous
2969 // address space. then we will deallocate that reservation, and re alloc
2970 // using large pages
2971 const size_t size_of_reserve = bytes + chunk_size;
2972 if (bytes > size_of_reserve) {
2973 // Overflowed.
2974 return NULL;
2975 }
2976 p_buf = (char *) VirtualAlloc(addr,
2977 size_of_reserve, // size of Reserve
2978 MEM_RESERVE,
2979 PAGE_READWRITE);
2980 // If reservation failed, return NULL
2981 if (p_buf == NULL) return NULL;
2982 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2983 os::release_memory(p_buf, bytes + chunk_size);
2984
2985 // we still need to round up to a page boundary (in case we are using large pages)
2986 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2987 // instead we handle this in the bytes_to_rq computation below
2988 p_buf = align_up(p_buf, page_size);
2989
2990 // now go through and allocate one chunk at a time until all bytes are
2991 // allocated
2992 size_t bytes_remaining = bytes;
2993 // An overflow of align_up() would have been caught above
2994 // in the calculation of size_of_reserve.
2995 char * next_alloc_addr = p_buf;
2996 HANDLE hProc = GetCurrentProcess();
2997
2998 #ifdef ASSERT
2999 // Variable for the failure injection
3000 int ran_num = os::random();
3001 size_t fail_after = ran_num % bytes;
3002 #endif
3003
3004 int count=0;
3005 while (bytes_remaining) {
3006 // select bytes_to_rq to get to the next chunk_size boundary
3007
3008 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3009 // Note allocate and commit
3010 char * p_new;
3011
3012 #ifdef ASSERT
3013 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3014 #else
3015 const bool inject_error_now = false;
3016 #endif
3017
3018 if (inject_error_now) {
3019 p_new = NULL;
3020 } else {
3021 if (!UseNUMAInterleaving) {
3022 p_new = (char *) VirtualAlloc(next_alloc_addr,
3023 bytes_to_rq,
3024 flags,
3025 prot);
3026 } else {
3027 // get the next node to use from the used_node_list
3028 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3029 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3030 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3031 }
3032 }
3033
3034 if (p_new == NULL) {
3035 // Free any allocated pages
3036 if (next_alloc_addr > p_buf) {
3037 // Some memory was committed so release it.
3038 size_t bytes_to_release = bytes - bytes_remaining;
3039 // NMT has yet to record any individual blocks, so it
3040 // need to create a dummy 'reserve' record to match
3041 // the release.
3042 MemTracker::record_virtual_memory_reserve((address)p_buf,
3043 bytes_to_release, CALLER_PC);
3044 os::release_memory(p_buf, bytes_to_release);
3045 }
3046 #ifdef ASSERT
3047 if (should_inject_error) {
3048 log_develop_debug(pagesize)("Reserving pages individually failed.");
3049 }
3050 #endif
3051 return NULL;
3052 }
3053
3054 bytes_remaining -= bytes_to_rq;
3055 next_alloc_addr += bytes_to_rq;
3056 count++;
3057 }
3058 // Although the memory is allocated individually, it is returned as one.
3059 // NMT records it as one block.
3060 if ((flags & MEM_COMMIT) != 0) {
3061 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3062 } else {
3063 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3064 }
3065
3066 // made it this far, success
3067 return p_buf;
3068 }
3069
3070 static size_t large_page_init_decide_size() {
3071 // print a warning if any large page related flag is specified on command line
3072 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3073 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3074
3075 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3076
3077 if (!request_lock_memory_privilege()) {
3078 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3079 return 0;
3080 }
3081
3082 size_t size = GetLargePageMinimum();
3083 if (size == 0) {
3084 WARN("Large page is not supported by the processor.");
3085 return 0;
3086 }
3087
3088 #if defined(IA32) || defined(AMD64)
3089 if (size > 4*M || LargePageSizeInBytes > 4*M) {
3090 WARN("JVM cannot use large pages bigger than 4mb.");
3091 return 0;
3092 }
3093 #endif
3094
3095 if (LargePageSizeInBytes > 0 && LargePageSizeInBytes % size == 0) {
3096 size = LargePageSizeInBytes;
3097 }
3098
3099 // Now test allocating a page
3100 void* large_page = VirtualAlloc(NULL,
3101 size,
3102 MEM_RESERVE|MEM_COMMIT|MEM_LARGE_PAGES,
3103 PAGE_READWRITE);
3104 if (large_page == NULL) {
3105 WARN("JVM cannot allocate one single large page.");
3106 return 0;
3107 }
3108
3109 // Detect if GDI can use memory backed by large pages
3110 if (!gdi_can_use_memory(large_page)) {
3111 WARN("JVM cannot use large pages because of bug in Windows GDI.");
3112 return 0;
3113 }
3114
3115 // Release test page
3116 VirtualFreeChecked(large_page, 0, MEM_RELEASE);
3117
3118 #undef WARN
3119
3120 return size;
3121 }
3122
3123 void os::large_page_init() {
3124 if (!UseLargePages) {
3125 return;
3126 }
3127
3128 _large_page_size = large_page_init_decide_size();
3129
3130 const size_t default_page_size = (size_t) vm_page_size();
3131 if (_large_page_size > default_page_size) {
3132 _page_sizes[0] = _large_page_size;
3133 _page_sizes[1] = default_page_size;
3134 _page_sizes[2] = 0;
3135 }
3136
3137 UseLargePages = _large_page_size != 0;
3138
3139 if (UseLargePages && UseLargePagesIndividualAllocation) {
3140 if (!gdi_can_use_split_reservation_memory(true /* use_large_pages */, _large_page_size)) {
3141 if (FLAG_IS_CMDLINE(UseLargePagesIndividualAllocation)) {
3142 warning("Windows GDI cannot handle split reservations.");
3143 warning("...Ignoring UseLargePagesIndividualAllocation flag.");
3144 }
3145 UseLargePagesIndividualAllocation = false;
3146 }
3147 }
3148 }
3149
3150 int os::create_file_for_heap(const char* dir) {
3151
3152 const char name_template[] = "/jvmheap.XXXXXX";
3153
3154 size_t fullname_len = strlen(dir) + strlen(name_template);
3155 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3156 if (fullname == NULL) {
3157 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3158 return -1;
3159 }
3160 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3161 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3162
3163 os::native_path(fullname);
3164
3165 char *path = _mktemp(fullname);
3166 if (path == NULL) {
3167 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3168 os::free(fullname);
3169 return -1;
3170 }
3171
3172 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3173
3174 os::free(fullname);
3175 if (fd < 0) {
3176 warning("Problem opening file for heap (%s)", os::strerror(errno));
3177 return -1;
3178 }
3179 return fd;
3180 }
3181
3182 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3183 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3184 assert(fd != -1, "File descriptor is not valid");
3185
3186 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3187 #ifdef _LP64
3188 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3189 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3190 #else
3191 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3192 0, (DWORD)size, NULL);
3193 #endif
3194 if (fileMapping == NULL) {
3195 if (GetLastError() == ERROR_DISK_FULL) {
3196 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3197 }
3198 else {
3199 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3200 }
3201
3202 return NULL;
3203 }
3204
3205 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3206
3207 CloseHandle(fileMapping);
3208
3209 return (char*)addr;
3210 }
3211
3212 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3213 assert(fd != -1, "File descriptor is not valid");
3214 assert(base != NULL, "Base address cannot be NULL");
3215
3216 release_memory(base, size);
3217 return map_memory_to_file(base, size, fd);
3218 }
3219
3220 // On win32, one cannot release just a part of reserved memory, it's an
3221 // all or nothing deal. When we split a reservation, we must break the
3222 // reservation into two reservations.
3223 void os::split_reserved_memory(char *base, size_t size, size_t split) {
3224
3225 char* const split_address = base + split;
3226 assert(size > 0, "Sanity");
3227 assert(size > split, "Sanity");
3228 assert(split > 0, "Sanity");
3229 assert(is_aligned(base, os::vm_allocation_granularity()), "Sanity");
3230 assert(is_aligned(split_address, os::vm_allocation_granularity()), "Sanity");
3231
3232 release_memory(base, size);
3233 reserve_memory(split, base);
3234 reserve_memory(size - split, split_address);
3235
3236 // NMT: nothing to do here. Since Windows implements the split by
3237 // releasing and re-reserving memory, the parts are already registered
3238 // as individual mappings with NMT.
3239
3240 }
3241
3242 // Multiple threads can race in this code but it's not possible to unmap small sections of
3243 // virtual space to get requested alignment, like posix-like os's.
3244 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3245 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3246 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3247 "Alignment must be a multiple of allocation granularity (page size)");
3248 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3249
3250 size_t extra_size = size + alignment;
3251 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3252
3253 char* aligned_base = NULL;
3254
3255 do {
3256 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3257 if (extra_base == NULL) {
3258 return NULL;
3259 }
3260 // Do manual alignment
3261 aligned_base = align_up(extra_base, alignment);
3262
3263 if (file_desc != -1) {
3264 os::unmap_memory(extra_base, extra_size);
3265 } else {
3266 os::release_memory(extra_base, extra_size);
3267 }
3268
3269 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3270
3271 } while (aligned_base == NULL);
3272
3273 return aligned_base;
3274 }
3275
3276 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3277 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3278 "reserve alignment");
3279 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3280 char* res;
3281 // note that if UseLargePages is on, all the areas that require interleaving
3282 // will go thru reserve_memory_special rather than thru here.
3283 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3284 if (!use_individual) {
3285 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3286 } else {
3287 elapsedTimer reserveTimer;
3288 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3289 // in numa interleaving, we have to allocate pages individually
3290 // (well really chunks of NUMAInterleaveGranularity size)
3291 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3292 if (res == NULL) {
3293 warning("NUMA page allocation failed");
3294 }
3295 if (Verbose && PrintMiscellaneous) {
3296 reserveTimer.stop();
3297 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3298 reserveTimer.milliseconds(), reserveTimer.ticks());
3299 }
3300 }
3301 assert(res == NULL || addr == NULL || addr == res,
3302 "Unexpected address from reserve.");
3303
3304 return res;
3305 }
3306
3307 // Reserve memory at an arbitrary address, only if that area is
3308 // available (and not reserved for something else).
3309 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3310 // Windows os::reserve_memory() fails of the requested address range is
3311 // not avilable.
3312 return reserve_memory(bytes, requested_addr);
3313 }
3314
3315 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3316 assert(file_desc >= 0, "file_desc is not valid");
3317 return map_memory_to_file(requested_addr, bytes, file_desc);
3318 }
3319
3320 size_t os::large_page_size() {
3321 return _large_page_size;
3322 }
3323
3324 bool os::can_commit_large_page_memory() {
3325 // Windows only uses large page memory when the entire region is reserved
3326 // and committed in a single VirtualAlloc() call. This may change in the
3327 // future, but with Windows 2003 it's not possible to commit on demand.
3328 return false;
3329 }
3330
3331 bool os::can_execute_large_page_memory() {
3332 return true;
3333 }
3334
3335 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3336 bool exec) {
3337 assert(UseLargePages, "only for large pages");
3338
3339 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3340 return NULL; // Fallback to small pages.
3341 }
3342
3343 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3344 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3345
3346 // with large pages, there are two cases where we need to use Individual Allocation
3347 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3348 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3349 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3350 log_debug(pagesize)("Reserving large pages individually.");
3351
3352 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3353 if (p_buf == NULL) {
3354 // give an appropriate warning message
3355 if (UseNUMAInterleaving) {
3356 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3357 }
3358 if (UseLargePagesIndividualAllocation) {
3359 warning("Individually allocated large pages failed, "
3360 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3361 }
3362 return NULL;
3363 }
3364
3365 return p_buf;
3366
3367 } else {
3368 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3369
3370 // normal policy just allocate it all at once
3371 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3372 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3373
3374 return res;
3375 }
3376 }
3377
3378 bool os::pd_release_memory_special(char* base, size_t bytes) {
3379 assert(base != NULL, "Sanity check");
3380 return pd_release_memory(base, bytes);
3381 }
3382
3383 void os::print_statistics() {
3384 }
3385
3386 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3387 int err = os::get_last_error();
3388 char buf[256];
3389 size_t buf_len = os::lasterror(buf, sizeof(buf));
3390 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3391 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3392 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3393 }
3394
3395 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3396 if (bytes == 0) {
3397 // Don't bother the OS with noops.
3398 return true;
3399 }
3400 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3401 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3402 // Don't attempt to print anything if the OS call fails. We're
3403 // probably low on resources, so the print itself may cause crashes.
3404
3405 // unless we have NUMAInterleaving enabled, the range of a commit
3406 // is always within a reserve covered by a single VirtualAlloc
3407 // in that case we can just do a single commit for the requested size
3408 if (!UseNUMAInterleaving) {
3409 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3410 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3411 return false;
3412 }
3413 if (exec) {
3414 DWORD oldprot;
3415 // Windows doc says to use VirtualProtect to get execute permissions
3416 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3417 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3418 return false;
3419 }
3420 }
3421 return true;
3422 } else {
3423
3424 // when NUMAInterleaving is enabled, the commit might cover a range that
3425 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3426 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3427 // returns represents the number of bytes that can be committed in one step.
3428 size_t bytes_remaining = bytes;
3429 char * next_alloc_addr = addr;
3430 while (bytes_remaining > 0) {
3431 MEMORY_BASIC_INFORMATION alloc_info;
3432 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3433 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3434 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3435 PAGE_READWRITE) == NULL) {
3436 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3437 exec);)
3438 return false;
3439 }
3440 if (exec) {
3441 DWORD oldprot;
3442 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3443 PAGE_EXECUTE_READWRITE, &oldprot)) {
3444 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3445 exec);)
3446 return false;
3447 }
3448 }
3449 bytes_remaining -= bytes_to_rq;
3450 next_alloc_addr += bytes_to_rq;
3451 }
3452 }
3453 // if we made it this far, return true
3454 return true;
3455 }
3456
3457 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3458 bool exec) {
3459 // alignment_hint is ignored on this OS
3460 return pd_commit_memory(addr, size, exec);
3461 }
3462
3463 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3464 const char* mesg) {
3465 assert(mesg != NULL, "mesg must be specified");
3466 if (!pd_commit_memory(addr, size, exec)) {
3467 warn_fail_commit_memory(addr, size, exec);
3468 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3469 }
3470 }
3471
3472 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3473 size_t alignment_hint, bool exec,
3474 const char* mesg) {
3475 // alignment_hint is ignored on this OS
3476 pd_commit_memory_or_exit(addr, size, exec, mesg);
3477 }
3478
3479 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3480 if (bytes == 0) {
3481 // Don't bother the OS with noops.
3482 return true;
3483 }
3484 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3485 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3486 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3487 }
3488
3489 bool os::pd_release_memory(char* addr, size_t bytes) {
3490 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3491 }
3492
3493 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3494 return os::commit_memory(addr, size, !ExecMem);
3495 }
3496
3497 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3498 return os::uncommit_memory(addr, size);
3499 }
3500
3501 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3502 uint count = 0;
3503 bool ret = false;
3504 size_t bytes_remaining = bytes;
3505 char * next_protect_addr = addr;
3506
3507 // Use VirtualQuery() to get the chunk size.
3508 while (bytes_remaining) {
3509 MEMORY_BASIC_INFORMATION alloc_info;
3510 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3511 return false;
3512 }
3513
3514 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3515 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3516 // but we don't distinguish here as both cases are protected by same API.
3517 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3518 warning("Failed protecting pages individually for chunk #%u", count);
3519 if (!ret) {
3520 return false;
3521 }
3522
3523 bytes_remaining -= bytes_to_protect;
3524 next_protect_addr += bytes_to_protect;
3525 count++;
3526 }
3527 return ret;
3528 }
3529
3530 // Set protections specified
3531 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3532 bool is_committed) {
3533 unsigned int p = 0;
3534 switch (prot) {
3535 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3536 case MEM_PROT_READ: p = PAGE_READONLY; break;
3537 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3538 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3539 default:
3540 ShouldNotReachHere();
3541 }
3542
3543 DWORD old_status;
3544
3545 // Strange enough, but on Win32 one can change protection only for committed
3546 // memory, not a big deal anyway, as bytes less or equal than 64K
3547 if (!is_committed) {
3548 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3549 "cannot commit protection page");
3550 }
3551 // One cannot use os::guard_memory() here, as on Win32 guard page
3552 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3553 //
3554 // Pages in the region become guard pages. Any attempt to access a guard page
3555 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3556 // the guard page status. Guard pages thus act as a one-time access alarm.
3557 bool ret;
3558 if (UseNUMAInterleaving) {
3559 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3560 // so we must protect the chunks individually.
3561 ret = protect_pages_individually(addr, bytes, p, &old_status);
3562 } else {
3563 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3564 }
3565 #ifdef ASSERT
3566 if (!ret) {
3567 int err = os::get_last_error();
3568 char buf[256];
3569 size_t buf_len = os::lasterror(buf, sizeof(buf));
3570 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3571 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3572 buf_len != 0 ? buf : "<no_error_string>", err);
3573 }
3574 #endif
3575 return ret;
3576 }
3577
3578 bool os::guard_memory(char* addr, size_t bytes) {
3579 DWORD old_status;
3580 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3581 }
3582
3583 bool os::unguard_memory(char* addr, size_t bytes) {
3584 DWORD old_status;
3585 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3586 }
3587
3588 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3589 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3590 void os::numa_make_global(char *addr, size_t bytes) { }
3591 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3592 bool os::numa_topology_changed() { return false; }
3593 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3594 int os::numa_get_group_id() { return 0; }
3595 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3596 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3597 // Provide an answer for UMA systems
3598 ids[0] = 0;
3599 return 1;
3600 } else {
3601 // check for size bigger than actual groups_num
3602 size = MIN2(size, numa_get_groups_num());
3603 for (int i = 0; i < (int)size; i++) {
3604 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3605 }
3606 return size;
3607 }
3608 }
3609
3610 int os::numa_get_group_id_for_address(const void* address) {
3611 return 0;
3612 }
3613
3614 bool os::get_page_info(char *start, page_info* info) {
3615 return false;
3616 }
3617
3618 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3619 page_info* page_found) {
3620 return end;
3621 }
3622
3623 char* os::non_memory_address_word() {
3624 // Must never look like an address returned by reserve_memory,
3625 // even in its subfields (as defined by the CPU immediate fields,
3626 // if the CPU splits constants across multiple instructions).
3627 return (char*)-1;
3628 }
3629
3630 #define MAX_ERROR_COUNT 100
3631 #define SYS_THREAD_ERROR 0xffffffffUL
3632
3633 void os::pd_start_thread(Thread* thread) {
3634 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3635 // Returns previous suspend state:
3636 // 0: Thread was not suspended
3637 // 1: Thread is running now
3638 // >1: Thread is still suspended.
3639 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3640 }
3641
3642
3643 // Short sleep, direct OS call.
3644 //
3645 // ms = 0, means allow others (if any) to run.
3646 //
3647 void os::naked_short_sleep(jlong ms) {
3648 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3649 Sleep(ms);
3650 }
3651
3652 // Windows does not provide sleep functionality with nanosecond resolution, so we
3653 // try to approximate this with spinning combined with yielding if another thread
3654 // is ready to run on the current processor.
3655 void os::naked_short_nanosleep(jlong ns) {
3656 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3657
3658 int64_t start = os::javaTimeNanos();
3659 do {
3660 if (SwitchToThread() == 0) {
3661 // Nothing else is ready to run on this cpu, spin a little
3662 SpinPause();
3663 }
3664 } while (os::javaTimeNanos() - start < ns);
3665 }
3666
3667 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3668 void os::infinite_sleep() {
3669 while (true) { // sleep forever ...
3670 Sleep(100000); // ... 100 seconds at a time
3671 }
3672 }
3673
3674 typedef BOOL (WINAPI * STTSignature)(void);
3675
3676 void os::naked_yield() {
3677 // Consider passing back the return value from SwitchToThread().
3678 SwitchToThread();
3679 }
3680
3681 // Win32 only gives you access to seven real priorities at a time,
3682 // so we compress Java's ten down to seven. It would be better
3683 // if we dynamically adjusted relative priorities.
3684
3685 int os::java_to_os_priority[CriticalPriority + 1] = {
3686 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3687 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3688 THREAD_PRIORITY_LOWEST, // 2
3689 THREAD_PRIORITY_BELOW_NORMAL, // 3
3690 THREAD_PRIORITY_BELOW_NORMAL, // 4
3691 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3692 THREAD_PRIORITY_NORMAL, // 6
3693 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3694 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3695 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3696 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3697 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3698 };
3699
3700 int prio_policy1[CriticalPriority + 1] = {
3701 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3702 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3703 THREAD_PRIORITY_LOWEST, // 2
3704 THREAD_PRIORITY_BELOW_NORMAL, // 3
3705 THREAD_PRIORITY_BELOW_NORMAL, // 4
3706 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3707 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3708 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3709 THREAD_PRIORITY_HIGHEST, // 8
3710 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3711 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3712 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3713 };
3714
3715 static int prio_init() {
3716 // If ThreadPriorityPolicy is 1, switch tables
3717 if (ThreadPriorityPolicy == 1) {
3718 int i;
3719 for (i = 0; i < CriticalPriority + 1; i++) {
3720 os::java_to_os_priority[i] = prio_policy1[i];
3721 }
3722 }
3723 if (UseCriticalJavaThreadPriority) {
3724 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3725 }
3726 return 0;
3727 }
3728
3729 OSReturn os::set_native_priority(Thread* thread, int priority) {
3730 if (!UseThreadPriorities) return OS_OK;
3731 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3732 return ret ? OS_OK : OS_ERR;
3733 }
3734
3735 OSReturn os::get_native_priority(const Thread* const thread,
3736 int* priority_ptr) {
3737 if (!UseThreadPriorities) {
3738 *priority_ptr = java_to_os_priority[NormPriority];
3739 return OS_OK;
3740 }
3741 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3742 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3743 assert(false, "GetThreadPriority failed");
3744 return OS_ERR;
3745 }
3746 *priority_ptr = os_prio;
3747 return OS_OK;
3748 }
3749
3750 // GetCurrentThreadId() returns DWORD
3751 intx os::current_thread_id() { return GetCurrentThreadId(); }
3752
3753 static int _initial_pid = 0;
3754
3755 int os::current_process_id() {
3756 return (_initial_pid ? _initial_pid : _getpid());
3757 }
3758
3759 int os::win32::_vm_page_size = 0;
3760 int os::win32::_vm_allocation_granularity = 0;
3761 int os::win32::_processor_type = 0;
3762 // Processor level is not available on non-NT systems, use vm_version instead
3763 int os::win32::_processor_level = 0;
3764 julong os::win32::_physical_memory = 0;
3765 size_t os::win32::_default_stack_size = 0;
3766
3767 intx os::win32::_os_thread_limit = 0;
3768 volatile intx os::win32::_os_thread_count = 0;
3769
3770 bool os::win32::_is_windows_server = false;
3771
3772 // 6573254
3773 // Currently, the bug is observed across all the supported Windows releases,
3774 // including the latest one (as of this writing - Windows Server 2012 R2)
3775 bool os::win32::_has_exit_bug = true;
3776
3777 void os::win32::initialize_system_info() {
3778 SYSTEM_INFO si;
3779 GetSystemInfo(&si);
3780 _vm_page_size = si.dwPageSize;
3781 _vm_allocation_granularity = si.dwAllocationGranularity;
3782 _processor_type = si.dwProcessorType;
3783 _processor_level = si.wProcessorLevel;
3784 set_processor_count(si.dwNumberOfProcessors);
3785
3786 MEMORYSTATUSEX ms;
3787 ms.dwLength = sizeof(ms);
3788
3789 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3790 // dwMemoryLoad (% of memory in use)
3791 GlobalMemoryStatusEx(&ms);
3792 _physical_memory = ms.ullTotalPhys;
3793
3794 if (FLAG_IS_DEFAULT(MaxRAM)) {
3795 // Adjust MaxRAM according to the maximum virtual address space available.
3796 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3797 }
3798
3799 OSVERSIONINFOEX oi;
3800 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3801 GetVersionEx((OSVERSIONINFO*)&oi);
3802 switch (oi.dwPlatformId) {
3803 case VER_PLATFORM_WIN32_NT:
3804 {
3805 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3806 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3807 oi.wProductType == VER_NT_SERVER) {
3808 _is_windows_server = true;
3809 }
3810 }
3811 break;
3812 default: fatal("Unknown platform");
3813 }
3814
3815 _default_stack_size = os::current_stack_size();
3816 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3817 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3818 "stack size not a multiple of page size");
3819
3820 initialize_performance_counter();
3821 }
3822
3823
3824 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3825 int ebuflen) {
3826 char path[MAX_PATH];
3827 DWORD size;
3828 DWORD pathLen = (DWORD)sizeof(path);
3829 HINSTANCE result = NULL;
3830
3831 // only allow library name without path component
3832 assert(strchr(name, '\\') == NULL, "path not allowed");
3833 assert(strchr(name, ':') == NULL, "path not allowed");
3834 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3835 jio_snprintf(ebuf, ebuflen,
3836 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3837 return NULL;
3838 }
3839
3840 // search system directory
3841 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3842 if (size >= pathLen) {
3843 return NULL; // truncated
3844 }
3845 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3846 return NULL; // truncated
3847 }
3848 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3849 return result;
3850 }
3851 }
3852
3853 // try Windows directory
3854 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3855 if (size >= pathLen) {
3856 return NULL; // truncated
3857 }
3858 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3859 return NULL; // truncated
3860 }
3861 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3862 return result;
3863 }
3864 }
3865
3866 jio_snprintf(ebuf, ebuflen,
3867 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3868 return NULL;
3869 }
3870
3871 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3872 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3873
3874 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3875 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3876 return TRUE;
3877 }
3878
3879 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3880 // Basic approach:
3881 // - Each exiting thread registers its intent to exit and then does so.
3882 // - A thread trying to terminate the process must wait for all
3883 // threads currently exiting to complete their exit.
3884
3885 if (os::win32::has_exit_bug()) {
3886 // The array holds handles of the threads that have started exiting by calling
3887 // _endthreadex().
3888 // Should be large enough to avoid blocking the exiting thread due to lack of
3889 // a free slot.
3890 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3891 static int handle_count = 0;
3892
3893 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3894 static CRITICAL_SECTION crit_sect;
3895 static volatile DWORD process_exiting = 0;
3896 int i, j;
3897 DWORD res;
3898 HANDLE hproc, hthr;
3899
3900 // We only attempt to register threads until a process exiting
3901 // thread manages to set the process_exiting flag. Any threads
3902 // that come through here after the process_exiting flag is set
3903 // are unregistered and will be caught in the SuspendThread()
3904 // infinite loop below.
3905 bool registered = false;
3906
3907 // The first thread that reached this point, initializes the critical section.
3908 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3909 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3910 } else if (Atomic::load_acquire(&process_exiting) == 0) {
3911 if (what != EPT_THREAD) {
3912 // Atomically set process_exiting before the critical section
3913 // to increase the visibility between racing threads.
3914 Atomic::cmpxchg(&process_exiting, (DWORD)0, GetCurrentThreadId());
3915 }
3916 EnterCriticalSection(&crit_sect);
3917
3918 if (what == EPT_THREAD && Atomic::load_acquire(&process_exiting) == 0) {
3919 // Remove from the array those handles of the threads that have completed exiting.
3920 for (i = 0, j = 0; i < handle_count; ++i) {
3921 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3922 if (res == WAIT_TIMEOUT) {
3923 handles[j++] = handles[i];
3924 } else {
3925 if (res == WAIT_FAILED) {
3926 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3927 GetLastError(), __FILE__, __LINE__);
3928 }
3929 // Don't keep the handle, if we failed waiting for it.
3930 CloseHandle(handles[i]);
3931 }
3932 }
3933
3934 // If there's no free slot in the array of the kept handles, we'll have to
3935 // wait until at least one thread completes exiting.
3936 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3937 // Raise the priority of the oldest exiting thread to increase its chances
3938 // to complete sooner.
3939 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3940 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3941 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3942 i = (res - WAIT_OBJECT_0);
3943 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3944 for (; i < handle_count; ++i) {
3945 handles[i] = handles[i + 1];
3946 }
3947 } else {
3948 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3949 (res == WAIT_FAILED ? "failed" : "timed out"),
3950 GetLastError(), __FILE__, __LINE__);
3951 // Don't keep handles, if we failed waiting for them.
3952 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3953 CloseHandle(handles[i]);
3954 }
3955 handle_count = 0;
3956 }
3957 }
3958
3959 // Store a duplicate of the current thread handle in the array of handles.
3960 hproc = GetCurrentProcess();
3961 hthr = GetCurrentThread();
3962 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3963 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3964 warning("DuplicateHandle failed (%u) in %s: %d\n",
3965 GetLastError(), __FILE__, __LINE__);
3966
3967 // We can't register this thread (no more handles) so this thread
3968 // may be racing with a thread that is calling exit(). If the thread
3969 // that is calling exit() has managed to set the process_exiting
3970 // flag, then this thread will be caught in the SuspendThread()
3971 // infinite loop below which closes that race. A small timing
3972 // window remains before the process_exiting flag is set, but it
3973 // is only exposed when we are out of handles.
3974 } else {
3975 ++handle_count;
3976 registered = true;
3977
3978 // The current exiting thread has stored its handle in the array, and now
3979 // should leave the critical section before calling _endthreadex().
3980 }
3981
3982 } else if (what != EPT_THREAD && handle_count > 0) {
3983 jlong start_time, finish_time, timeout_left;
3984 // Before ending the process, make sure all the threads that had called
3985 // _endthreadex() completed.
3986
3987 // Set the priority level of the current thread to the same value as
3988 // the priority level of exiting threads.
3989 // This is to ensure it will be given a fair chance to execute if
3990 // the timeout expires.
3991 hthr = GetCurrentThread();
3992 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3993 start_time = os::javaTimeNanos();
3994 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3995 for (i = 0; ; ) {
3996 int portion_count = handle_count - i;
3997 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3998 portion_count = MAXIMUM_WAIT_OBJECTS;
3999 }
4000 for (j = 0; j < portion_count; ++j) {
4001 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4002 }
4003 timeout_left = (finish_time - start_time) / 1000000L;
4004 if (timeout_left < 0) {
4005 timeout_left = 0;
4006 }
4007 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4008 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4009 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4010 (res == WAIT_FAILED ? "failed" : "timed out"),
4011 GetLastError(), __FILE__, __LINE__);
4012 // Reset portion_count so we close the remaining
4013 // handles due to this error.
4014 portion_count = handle_count - i;
4015 }
4016 for (j = 0; j < portion_count; ++j) {
4017 CloseHandle(handles[i + j]);
4018 }
4019 if ((i += portion_count) >= handle_count) {
4020 break;
4021 }
4022 start_time = os::javaTimeNanos();
4023 }
4024 handle_count = 0;
4025 }
4026
4027 LeaveCriticalSection(&crit_sect);
4028 }
4029
4030 if (!registered &&
4031 Atomic::load_acquire(&process_exiting) != 0 &&
4032 process_exiting != GetCurrentThreadId()) {
4033 // Some other thread is about to call exit(), so we don't let
4034 // the current unregistered thread proceed to exit() or _endthreadex()
4035 while (true) {
4036 SuspendThread(GetCurrentThread());
4037 // Avoid busy-wait loop, if SuspendThread() failed.
4038 Sleep(EXIT_TIMEOUT);
4039 }
4040 }
4041 }
4042
4043 // We are here if either
4044 // - there's no 'race at exit' bug on this OS release;
4045 // - initialization of the critical section failed (unlikely);
4046 // - the current thread has registered itself and left the critical section;
4047 // - the process-exiting thread has raised the flag and left the critical section.
4048 if (what == EPT_THREAD) {
4049 _endthreadex((unsigned)exit_code);
4050 } else if (what == EPT_PROCESS) {
4051 ::exit(exit_code);
4052 } else {
4053 _exit(exit_code);
4054 }
4055
4056 // Should not reach here
4057 return exit_code;
4058 }
4059
4060 #undef EXIT_TIMEOUT
4061
4062 void os::win32::setmode_streams() {
4063 _setmode(_fileno(stdin), _O_BINARY);
4064 _setmode(_fileno(stdout), _O_BINARY);
4065 _setmode(_fileno(stderr), _O_BINARY);
4066 }
4067
4068 void os::wait_for_keypress_at_exit(void) {
4069 if (PauseAtExit) {
4070 fprintf(stderr, "Press any key to continue...\n");
4071 fgetc(stdin);
4072 }
4073 }
4074
4075
4076 bool os::message_box(const char* title, const char* message) {
4077 int result = MessageBox(NULL, message, title,
4078 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4079 return result == IDYES;
4080 }
4081
4082 #ifndef PRODUCT
4083 #ifndef _WIN64
4084 // Helpers to check whether NX protection is enabled
4085 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4086 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4087 pex->ExceptionRecord->NumberParameters > 0 &&
4088 pex->ExceptionRecord->ExceptionInformation[0] ==
4089 EXCEPTION_INFO_EXEC_VIOLATION) {
4090 return EXCEPTION_EXECUTE_HANDLER;
4091 }
4092 return EXCEPTION_CONTINUE_SEARCH;
4093 }
4094
4095 void nx_check_protection() {
4096 // If NX is enabled we'll get an exception calling into code on the stack
4097 char code[] = { (char)0xC3 }; // ret
4098 void *code_ptr = (void *)code;
4099 __try {
4100 __asm call code_ptr
4101 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4102 tty->print_raw_cr("NX protection detected.");
4103 }
4104 }
4105 #endif // _WIN64
4106 #endif // PRODUCT
4107
4108 // This is called _before_ the global arguments have been parsed
4109 void os::init(void) {
4110 _initial_pid = _getpid();
4111
4112 init_random(1234567);
4113
4114 win32::initialize_system_info();
4115 win32::setmode_streams();
4116 init_page_sizes((size_t) win32::vm_page_size());
4117
4118 // This may be overridden later when argument processing is done.
4119 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
4120
4121 // Initialize main_process and main_thread
4122 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4123 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4124 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4125 fatal("DuplicateHandle failed\n");
4126 }
4127 main_thread_id = (int) GetCurrentThreadId();
4128
4129 // initialize fast thread access - only used for 32-bit
4130 win32::initialize_thread_ptr_offset();
4131 }
4132
4133 // To install functions for atexit processing
4134 extern "C" {
4135 static void perfMemory_exit_helper() {
4136 perfMemory_exit();
4137 }
4138 }
4139
4140 static jint initSock();
4141
4142 // this is called _after_ the global arguments have been parsed
4143 jint os::init_2(void) {
4144
4145 // This could be set any time but all platforms
4146 // have to set it the same so we have to mirror Solaris.
4147 DEBUG_ONLY(os::set_mutex_init_done();)
4148
4149 // Setup Windows Exceptions
4150
4151 #if INCLUDE_AOT
4152 // If AOT is enabled we need to install a vectored exception handler
4153 // in order to forward implicit exceptions from code in AOT
4154 // generated DLLs. This is necessary since these DLLs are not
4155 // registered for structured exceptions like codecache methods are.
4156 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4157 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4158 }
4159 #endif
4160
4161 // for debugging float code generation bugs
4162 if (ForceFloatExceptions) {
4163 #ifndef _WIN64
4164 static long fp_control_word = 0;
4165 __asm { fstcw fp_control_word }
4166 // see Intel PPro Manual, Vol. 2, p 7-16
4167 const long precision = 0x20;
4168 const long underflow = 0x10;
4169 const long overflow = 0x08;
4170 const long zero_div = 0x04;
4171 const long denorm = 0x02;
4172 const long invalid = 0x01;
4173 fp_control_word |= invalid;
4174 __asm { fldcw fp_control_word }
4175 #endif
4176 }
4177
4178 // If stack_commit_size is 0, windows will reserve the default size,
4179 // but only commit a small portion of it.
4180 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4181 size_t default_reserve_size = os::win32::default_stack_size();
4182 size_t actual_reserve_size = stack_commit_size;
4183 if (stack_commit_size < default_reserve_size) {
4184 // If stack_commit_size == 0, we want this too
4185 actual_reserve_size = default_reserve_size;
4186 }
4187
4188 // Check minimum allowable stack size for thread creation and to initialize
4189 // the java system classes, including StackOverflowError - depends on page
4190 // size. Add two 4K pages for compiler2 recursion in main thread.
4191 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4192 // class initialization depending on 32 or 64 bit VM.
4193 size_t min_stack_allowed =
4194 (size_t)(JavaThread::stack_guard_zone_size() +
4195 JavaThread::stack_shadow_zone_size() +
4196 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4197
4198 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4199
4200 if (actual_reserve_size < min_stack_allowed) {
4201 tty->print_cr("\nThe Java thread stack size specified is too small. "
4202 "Specify at least %dk",
4203 min_stack_allowed / K);
4204 return JNI_ERR;
4205 }
4206
4207 JavaThread::set_stack_size_at_create(stack_commit_size);
4208
4209 // Calculate theoretical max. size of Threads to guard gainst artifical
4210 // out-of-memory situations, where all available address-space has been
4211 // reserved by thread stacks.
4212 assert(actual_reserve_size != 0, "Must have a stack");
4213
4214 // Calculate the thread limit when we should start doing Virtual Memory
4215 // banging. Currently when the threads will have used all but 200Mb of space.
4216 //
4217 // TODO: consider performing a similar calculation for commit size instead
4218 // as reserve size, since on a 64-bit platform we'll run into that more
4219 // often than running out of virtual memory space. We can use the
4220 // lower value of the two calculations as the os_thread_limit.
4221 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4222 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4223
4224 // at exit methods are called in the reverse order of their registration.
4225 // there is no limit to the number of functions registered. atexit does
4226 // not set errno.
4227
4228 if (PerfAllowAtExitRegistration) {
4229 // only register atexit functions if PerfAllowAtExitRegistration is set.
4230 // atexit functions can be delayed until process exit time, which
4231 // can be problematic for embedded VM situations. Embedded VMs should
4232 // call DestroyJavaVM() to assure that VM resources are released.
4233
4234 // note: perfMemory_exit_helper atexit function may be removed in
4235 // the future if the appropriate cleanup code can be added to the
4236 // VM_Exit VMOperation's doit method.
4237 if (atexit(perfMemory_exit_helper) != 0) {
4238 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4239 }
4240 }
4241
4242 #ifndef _WIN64
4243 // Print something if NX is enabled (win32 on AMD64)
4244 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4245 #endif
4246
4247 // initialize thread priority policy
4248 prio_init();
4249
4250 if (UseNUMA && !ForceNUMA) {
4251 UseNUMA = false; // We don't fully support this yet
4252 }
4253
4254 if (UseNUMAInterleaving || (UseNUMA && FLAG_IS_DEFAULT(UseNUMAInterleaving))) {
4255 if (!numa_interleaving_init()) {
4256 FLAG_SET_ERGO(UseNUMAInterleaving, false);
4257 } else if (!UseNUMAInterleaving) {
4258 // When NUMA requested, not-NUMA-aware allocations default to interleaving.
4259 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4260 }
4261 }
4262
4263 if (initSock() != JNI_OK) {
4264 return JNI_ERR;
4265 }
4266
4267 SymbolEngine::recalc_search_path();
4268
4269 // Initialize data for jdk.internal.misc.Signal
4270 if (!ReduceSignalUsage) {
4271 jdk_misc_signal_init();
4272 }
4273
4274 return JNI_OK;
4275 }
4276
4277 // combine the high and low DWORD into a ULONGLONG
4278 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4279 ULONGLONG value = high_word;
4280 value <<= sizeof(high_word) * 8;
4281 value |= low_word;
4282 return value;
4283 }
4284
4285 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4286 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4287 ::memset((void*)sbuf, 0, sizeof(struct stat));
4288 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4289 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4290 file_data.ftLastWriteTime.dwLowDateTime);
4291 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4292 file_data.ftCreationTime.dwLowDateTime);
4293 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4294 file_data.ftLastAccessTime.dwLowDateTime);
4295 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4296 sbuf->st_mode |= S_IFDIR;
4297 } else {
4298 sbuf->st_mode |= S_IFREG;
4299 }
4300 }
4301
4302 static errno_t convert_to_unicode(char const* char_path, LPWSTR* unicode_path) {
4303 // Get required buffer size to convert to Unicode
4304 int unicode_path_len = MultiByteToWideChar(CP_ACP,
4305 MB_ERR_INVALID_CHARS,
4306 char_path, -1,
4307 NULL, 0);
4308 if (unicode_path_len == 0) {
4309 return EINVAL;
4310 }
4311
4312 *unicode_path = NEW_C_HEAP_ARRAY(WCHAR, unicode_path_len, mtInternal);
4313
4314 int result = MultiByteToWideChar(CP_ACP,
4315 MB_ERR_INVALID_CHARS,
4316 char_path, -1,
4317 *unicode_path, unicode_path_len);
4318 assert(result == unicode_path_len, "length already checked above");
4319
4320 return ERROR_SUCCESS;
4321 }
4322
4323 static errno_t get_full_path(LPCWSTR unicode_path, LPWSTR* full_path) {
4324 // Get required buffer size to convert to full path. The return
4325 // value INCLUDES the terminating null character.
4326 DWORD full_path_len = GetFullPathNameW(unicode_path, 0, NULL, NULL);
4327 if (full_path_len == 0) {
4328 return EINVAL;
4329 }
4330
4331 *full_path = NEW_C_HEAP_ARRAY(WCHAR, full_path_len, mtInternal);
4332
4333 // When the buffer has sufficient size, the return value EXCLUDES the
4334 // terminating null character
4335 DWORD result = GetFullPathNameW(unicode_path, full_path_len, *full_path, NULL);
4336 assert(result <= full_path_len, "length already checked above");
4337
4338 return ERROR_SUCCESS;
4339 }
4340
4341 static void set_path_prefix(char* buf, LPWSTR* prefix, int* prefix_off, bool* needs_fullpath) {
4342 *prefix_off = 0;
4343 *needs_fullpath = true;
4344
4345 if (::isalpha(buf[0]) && !::IsDBCSLeadByte(buf[0]) && buf[1] == ':' && buf[2] == '\\') {
4346 *prefix = L"\\\\?\\";
4347 } else if (buf[0] == '\\' && buf[1] == '\\') {
4348 if (buf[2] == '?' && buf[3] == '\\') {
4349 *prefix = L"";
4350 *needs_fullpath = false;
4351 } else {
4352 *prefix = L"\\\\?\\UNC";
4353 *prefix_off = 1; // Overwrite the first char with the prefix, so \\share\path becomes \\?\UNC\share\path
4354 }
4355 } else {
4356 *prefix = L"\\\\?\\";
4357 }
4358 }
4359
4360 // Returns the given path as an absolute wide path in unc format. The returned path is NULL
4361 // on error (with err being set accordingly) and should be freed via os::free() otherwise.
4362 // additional_space is the size of space, in wchar_t, the function will additionally add to
4363 // the allocation of return buffer (such that the size of the returned buffer is at least
4364 // wcslen(buf) + 1 + additional_space).
4365 static wchar_t* wide_abs_unc_path(char const* path, errno_t & err, int additional_space = 0) {
4366 if ((path == NULL) || (path[0] == '\0')) {
4367 err = ENOENT;
4368 return NULL;
4369 }
4370
4371 // Need to allocate at least room for 3 characters, since os::native_path transforms C: to C:.
4372 size_t buf_len = 1 + MAX2((size_t)3, strlen(path));
4373 char* buf = NEW_C_HEAP_ARRAY(char, buf_len, mtInternal);
4374 strncpy(buf, path, buf_len);
4375 os::native_path(buf);
4376
4377 LPWSTR prefix = NULL;
4378 int prefix_off = 0;
4379 bool needs_fullpath = true;
4380 set_path_prefix(buf, &prefix, &prefix_off, &needs_fullpath);
4381
4382 LPWSTR unicode_path = NULL;
4383 err = convert_to_unicode(buf, &unicode_path);
4384 FREE_C_HEAP_ARRAY(char, buf);
4385 if (err != ERROR_SUCCESS) {
4386 return NULL;
4387 }
4388
4389 LPWSTR converted_path = NULL;
4390 if (needs_fullpath) {
4391 err = get_full_path(unicode_path, &converted_path);
4392 } else {
4393 converted_path = unicode_path;
4394 }
4395
4396 LPWSTR result = NULL;
4397 if (converted_path != NULL) {
4398 size_t prefix_len = wcslen(prefix);
4399 size_t result_len = prefix_len - prefix_off + wcslen(converted_path) + additional_space + 1;
4400 result = NEW_C_HEAP_ARRAY(WCHAR, result_len, mtInternal);
4401 _snwprintf(result, result_len, L"%s%s", prefix, &converted_path[prefix_off]);
4402
4403 // Remove trailing pathsep (not for \\?\<DRIVE>:\, since it would make it relative)
4404 result_len = wcslen(result);
4405 if ((result[result_len - 1] == L'\\') &&
4406 !(::iswalpha(result[4]) && result[5] == L':' && result_len == 7)) {
4407 result[result_len - 1] = L'\0';
4408 }
4409 }
4410
4411 if (converted_path != unicode_path) {
4412 FREE_C_HEAP_ARRAY(WCHAR, converted_path);
4413 }
4414 FREE_C_HEAP_ARRAY(WCHAR, unicode_path);
4415
4416 return static_cast<wchar_t*>(result); // LPWSTR and wchat_t* are the same type on Windows.
4417 }
4418
4419 int os::stat(const char *path, struct stat *sbuf) {
4420 errno_t err;
4421 wchar_t* wide_path = wide_abs_unc_path(path, err);
4422
4423 if (wide_path == NULL) {
4424 errno = err;
4425 return -1;
4426 }
4427
4428 WIN32_FILE_ATTRIBUTE_DATA file_data;;
4429 BOOL bret = ::GetFileAttributesExW(wide_path, GetFileExInfoStandard, &file_data);
4430 os::free(wide_path);
4431
4432 if (!bret) {
4433 errno = ::GetLastError();
4434 return -1;
4435 }
4436
4437 file_attribute_data_to_stat(sbuf, file_data);
4438 return 0;
4439 }
4440
4441 static HANDLE create_read_only_file_handle(const char* file) {
4442 errno_t err;
4443 wchar_t* wide_path = wide_abs_unc_path(file, err);
4444
4445 if (wide_path == NULL) {
4446 errno = err;
4447 return INVALID_HANDLE_VALUE;
4448 }
4449
4450 HANDLE handle = ::CreateFileW(wide_path, 0, FILE_SHARE_READ,
4451 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4452 os::free(wide_path);
4453
4454 return handle;
4455 }
4456
4457 bool os::same_files(const char* file1, const char* file2) {
4458
4459 if (file1 == NULL && file2 == NULL) {
4460 return true;
4461 }
4462
4463 if (file1 == NULL || file2 == NULL) {
4464 return false;
4465 }
4466
4467 if (strcmp(file1, file2) == 0) {
4468 return true;
4469 }
4470
4471 HANDLE handle1 = create_read_only_file_handle(file1);
4472 HANDLE handle2 = create_read_only_file_handle(file2);
4473 bool result = false;
4474
4475 // if we could open both paths...
4476 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4477 BY_HANDLE_FILE_INFORMATION fileInfo1;
4478 BY_HANDLE_FILE_INFORMATION fileInfo2;
4479 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4480 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4481 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4482 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4483 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4484 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4485 result = true;
4486 }
4487 }
4488 }
4489
4490 //free the handles
4491 if (handle1 != INVALID_HANDLE_VALUE) {
4492 ::CloseHandle(handle1);
4493 }
4494
4495 if (handle2 != INVALID_HANDLE_VALUE) {
4496 ::CloseHandle(handle2);
4497 }
4498
4499 return result;
4500 }
4501
4502 #define FT2INT64(ft) \
4503 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4504
4505
4506 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4507 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4508 // of a thread.
4509 //
4510 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4511 // the fast estimate available on the platform.
4512
4513 // current_thread_cpu_time() is not optimized for Windows yet
4514 jlong os::current_thread_cpu_time() {
4515 // return user + sys since the cost is the same
4516 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4517 }
4518
4519 jlong os::thread_cpu_time(Thread* thread) {
4520 // consistent with what current_thread_cpu_time() returns.
4521 return os::thread_cpu_time(thread, true /* user+sys */);
4522 }
4523
4524 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4525 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4526 }
4527
4528 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4529 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4530 // If this function changes, os::is_thread_cpu_time_supported() should too
4531 FILETIME CreationTime;
4532 FILETIME ExitTime;
4533 FILETIME KernelTime;
4534 FILETIME UserTime;
4535
4536 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4537 &ExitTime, &KernelTime, &UserTime) == 0) {
4538 return -1;
4539 } else if (user_sys_cpu_time) {
4540 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4541 } else {
4542 return FT2INT64(UserTime) * 100;
4543 }
4544 }
4545
4546 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4547 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4548 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4549 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4550 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4551 }
4552
4553 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4554 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4555 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4556 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4557 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4558 }
4559
4560 bool os::is_thread_cpu_time_supported() {
4561 // see os::thread_cpu_time
4562 FILETIME CreationTime;
4563 FILETIME ExitTime;
4564 FILETIME KernelTime;
4565 FILETIME UserTime;
4566
4567 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4568 &KernelTime, &UserTime) == 0) {
4569 return false;
4570 } else {
4571 return true;
4572 }
4573 }
4574
4575 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4576 // It does have primitives (PDH API) to get CPU usage and run queue length.
4577 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4578 // If we wanted to implement loadavg on Windows, we have a few options:
4579 //
4580 // a) Query CPU usage and run queue length and "fake" an answer by
4581 // returning the CPU usage if it's under 100%, and the run queue
4582 // length otherwise. It turns out that querying is pretty slow
4583 // on Windows, on the order of 200 microseconds on a fast machine.
4584 // Note that on the Windows the CPU usage value is the % usage
4585 // since the last time the API was called (and the first call
4586 // returns 100%), so we'd have to deal with that as well.
4587 //
4588 // b) Sample the "fake" answer using a sampling thread and store
4589 // the answer in a global variable. The call to loadavg would
4590 // just return the value of the global, avoiding the slow query.
4591 //
4592 // c) Sample a better answer using exponential decay to smooth the
4593 // value. This is basically the algorithm used by UNIX kernels.
4594 //
4595 // Note that sampling thread starvation could affect both (b) and (c).
4596 int os::loadavg(double loadavg[], int nelem) {
4597 return -1;
4598 }
4599
4600
4601 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4602 bool os::dont_yield() {
4603 return DontYieldALot;
4604 }
4605
4606 int os::open(const char *path, int oflag, int mode) {
4607 errno_t err;
4608 wchar_t* wide_path = wide_abs_unc_path(path, err);
4609
4610 if (wide_path == NULL) {
4611 errno = err;
4612 return -1;
4613 }
4614 int fd = ::_wopen(wide_path, oflag | O_BINARY | O_NOINHERIT, mode);
4615 os::free(wide_path);
4616
4617 if (fd == -1) {
4618 errno = ::GetLastError();
4619 }
4620
4621 return fd;
4622 }
4623
4624 FILE* os::open(int fd, const char* mode) {
4625 return ::_fdopen(fd, mode);
4626 }
4627
4628 // Is a (classpath) directory empty?
4629 bool os::dir_is_empty(const char* path) {
4630 errno_t err;
4631 wchar_t* wide_path = wide_abs_unc_path(path, err, 2);
4632
4633 if (wide_path == NULL) {
4634 errno = err;
4635 return false;
4636 }
4637
4638 // Make sure we end with "\\*"
4639 if (wide_path[wcslen(wide_path) - 1] == L'\\') {
4640 wcscat(wide_path, L"*");
4641 } else {
4642 wcscat(wide_path, L"\\*");
4643 }
4644
4645 WIN32_FIND_DATAW fd;
4646 HANDLE f = ::FindFirstFileW(wide_path, &fd);
4647 os::free(wide_path);
4648 bool is_empty = true;
4649
4650 if (f != INVALID_HANDLE_VALUE) {
4651 while (is_empty && ::FindNextFileW(f, &fd)) {
4652 // An empty directory contains only the current directory file
4653 // and the previous directory file.
4654 if ((wcscmp(fd.cFileName, L".") != 0) &&
4655 (wcscmp(fd.cFileName, L"..") != 0)) {
4656 is_empty = false;
4657 }
4658 }
4659 FindClose(f);
4660 } else {
4661 errno = ::GetLastError();
4662 }
4663
4664 return is_empty;
4665 }
4666
4667 // create binary file, rewriting existing file if required
4668 int os::create_binary_file(const char* path, bool rewrite_existing) {
4669 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4670 if (!rewrite_existing) {
4671 oflags |= _O_EXCL;
4672 }
4673 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4674 }
4675
4676 // return current position of file pointer
4677 jlong os::current_file_offset(int fd) {
4678 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4679 }
4680
4681 // move file pointer to the specified offset
4682 jlong os::seek_to_file_offset(int fd, jlong offset) {
4683 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4684 }
4685
4686
4687 jlong os::lseek(int fd, jlong offset, int whence) {
4688 return (jlong) ::_lseeki64(fd, offset, whence);
4689 }
4690
4691 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4692 OVERLAPPED ov;
4693 DWORD nread;
4694 BOOL result;
4695
4696 ZeroMemory(&ov, sizeof(ov));
4697 ov.Offset = (DWORD)offset;
4698 ov.OffsetHigh = (DWORD)(offset >> 32);
4699
4700 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4701
4702 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4703
4704 return result ? nread : 0;
4705 }
4706
4707
4708 // This method is a slightly reworked copy of JDK's sysNativePath
4709 // from src/windows/hpi/src/path_md.c
4710
4711 // Convert a pathname to native format. On win32, this involves forcing all
4712 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4713 // sometimes rejects '/') and removing redundant separators. The input path is
4714 // assumed to have been converted into the character encoding used by the local
4715 // system. Because this might be a double-byte encoding, care is taken to
4716 // treat double-byte lead characters correctly.
4717 //
4718 // This procedure modifies the given path in place, as the result is never
4719 // longer than the original. There is no error return; this operation always
4720 // succeeds.
4721 char * os::native_path(char *path) {
4722 char *src = path, *dst = path, *end = path;
4723 char *colon = NULL; // If a drive specifier is found, this will
4724 // point to the colon following the drive letter
4725
4726 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4727 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4728 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4729
4730 // Check for leading separators
4731 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4732 while (isfilesep(*src)) {
4733 src++;
4734 }
4735
4736 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4737 // Remove leading separators if followed by drive specifier. This
4738 // hack is necessary to support file URLs containing drive
4739 // specifiers (e.g., "file://c:/path"). As a side effect,
4740 // "/c:/path" can be used as an alternative to "c:/path".
4741 *dst++ = *src++;
4742 colon = dst;
4743 *dst++ = ':';
4744 src++;
4745 } else {
4746 src = path;
4747 if (isfilesep(src[0]) && isfilesep(src[1])) {
4748 // UNC pathname: Retain first separator; leave src pointed at
4749 // second separator so that further separators will be collapsed
4750 // into the second separator. The result will be a pathname
4751 // beginning with "\\\\" followed (most likely) by a host name.
4752 src = dst = path + 1;
4753 path[0] = '\\'; // Force first separator to '\\'
4754 }
4755 }
4756
4757 end = dst;
4758
4759 // Remove redundant separators from remainder of path, forcing all
4760 // separators to be '\\' rather than '/'. Also, single byte space
4761 // characters are removed from the end of the path because those
4762 // are not legal ending characters on this operating system.
4763 //
4764 while (*src != '\0') {
4765 if (isfilesep(*src)) {
4766 *dst++ = '\\'; src++;
4767 while (isfilesep(*src)) src++;
4768 if (*src == '\0') {
4769 // Check for trailing separator
4770 end = dst;
4771 if (colon == dst - 2) break; // "z:\\"
4772 if (dst == path + 1) break; // "\\"
4773 if (dst == path + 2 && isfilesep(path[0])) {
4774 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4775 // beginning of a UNC pathname. Even though it is not, by
4776 // itself, a valid UNC pathname, we leave it as is in order
4777 // to be consistent with the path canonicalizer as well
4778 // as the win32 APIs, which treat this case as an invalid
4779 // UNC pathname rather than as an alias for the root
4780 // directory of the current drive.
4781 break;
4782 }
4783 end = --dst; // Path does not denote a root directory, so
4784 // remove trailing separator
4785 break;
4786 }
4787 end = dst;
4788 } else {
4789 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4790 *dst++ = *src++;
4791 if (*src) *dst++ = *src++;
4792 end = dst;
4793 } else { // Copy a single-byte character
4794 char c = *src++;
4795 *dst++ = c;
4796 // Space is not a legal ending character
4797 if (c != ' ') end = dst;
4798 }
4799 }
4800 }
4801
4802 *end = '\0';
4803
4804 // For "z:", add "." to work around a bug in the C runtime library
4805 if (colon == dst - 1) {
4806 path[2] = '.';
4807 path[3] = '\0';
4808 }
4809
4810 return path;
4811 }
4812
4813 // This code is a copy of JDK's sysSetLength
4814 // from src/windows/hpi/src/sys_api_md.c
4815
4816 int os::ftruncate(int fd, jlong length) {
4817 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4818 long high = (long)(length >> 32);
4819 DWORD ret;
4820
4821 if (h == (HANDLE)(-1)) {
4822 return -1;
4823 }
4824
4825 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4826 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4827 return -1;
4828 }
4829
4830 if (::SetEndOfFile(h) == FALSE) {
4831 return -1;
4832 }
4833
4834 return 0;
4835 }
4836
4837 int os::get_fileno(FILE* fp) {
4838 return _fileno(fp);
4839 }
4840
4841 // This code is a copy of JDK's sysSync
4842 // from src/windows/hpi/src/sys_api_md.c
4843 // except for the legacy workaround for a bug in Win 98
4844
4845 int os::fsync(int fd) {
4846 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4847
4848 if ((!::FlushFileBuffers(handle)) &&
4849 (GetLastError() != ERROR_ACCESS_DENIED)) {
4850 // from winerror.h
4851 return -1;
4852 }
4853 return 0;
4854 }
4855
4856 static int nonSeekAvailable(int, long *);
4857 static int stdinAvailable(int, long *);
4858
4859 // This code is a copy of JDK's sysAvailable
4860 // from src/windows/hpi/src/sys_api_md.c
4861
4862 int os::available(int fd, jlong *bytes) {
4863 jlong cur, end;
4864 struct _stati64 stbuf64;
4865
4866 if (::_fstati64(fd, &stbuf64) >= 0) {
4867 int mode = stbuf64.st_mode;
4868 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4869 int ret;
4870 long lpbytes;
4871 if (fd == 0) {
4872 ret = stdinAvailable(fd, &lpbytes);
4873 } else {
4874 ret = nonSeekAvailable(fd, &lpbytes);
4875 }
4876 (*bytes) = (jlong)(lpbytes);
4877 return ret;
4878 }
4879 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4880 return FALSE;
4881 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4882 return FALSE;
4883 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4884 return FALSE;
4885 }
4886 *bytes = end - cur;
4887 return TRUE;
4888 } else {
4889 return FALSE;
4890 }
4891 }
4892
4893 void os::flockfile(FILE* fp) {
4894 _lock_file(fp);
4895 }
4896
4897 void os::funlockfile(FILE* fp) {
4898 _unlock_file(fp);
4899 }
4900
4901 // This code is a copy of JDK's nonSeekAvailable
4902 // from src/windows/hpi/src/sys_api_md.c
4903
4904 static int nonSeekAvailable(int fd, long *pbytes) {
4905 // This is used for available on non-seekable devices
4906 // (like both named and anonymous pipes, such as pipes
4907 // connected to an exec'd process).
4908 // Standard Input is a special case.
4909 HANDLE han;
4910
4911 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4912 return FALSE;
4913 }
4914
4915 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4916 // PeekNamedPipe fails when at EOF. In that case we
4917 // simply make *pbytes = 0 which is consistent with the
4918 // behavior we get on Solaris when an fd is at EOF.
4919 // The only alternative is to raise an Exception,
4920 // which isn't really warranted.
4921 //
4922 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4923 return FALSE;
4924 }
4925 *pbytes = 0;
4926 }
4927 return TRUE;
4928 }
4929
4930 #define MAX_INPUT_EVENTS 2000
4931
4932 // This code is a copy of JDK's stdinAvailable
4933 // from src/windows/hpi/src/sys_api_md.c
4934
4935 static int stdinAvailable(int fd, long *pbytes) {
4936 HANDLE han;
4937 DWORD numEventsRead = 0; // Number of events read from buffer
4938 DWORD numEvents = 0; // Number of events in buffer
4939 DWORD i = 0; // Loop index
4940 DWORD curLength = 0; // Position marker
4941 DWORD actualLength = 0; // Number of bytes readable
4942 BOOL error = FALSE; // Error holder
4943 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4944
4945 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4946 return FALSE;
4947 }
4948
4949 // Construct an array of input records in the console buffer
4950 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4951 if (error == 0) {
4952 return nonSeekAvailable(fd, pbytes);
4953 }
4954
4955 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4956 if (numEvents > MAX_INPUT_EVENTS) {
4957 numEvents = MAX_INPUT_EVENTS;
4958 }
4959
4960 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4961 if (lpBuffer == NULL) {
4962 return FALSE;
4963 }
4964
4965 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4966 if (error == 0) {
4967 os::free(lpBuffer);
4968 return FALSE;
4969 }
4970
4971 // Examine input records for the number of bytes available
4972 for (i=0; i<numEvents; i++) {
4973 if (lpBuffer[i].EventType == KEY_EVENT) {
4974
4975 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4976 &(lpBuffer[i].Event);
4977 if (keyRecord->bKeyDown == TRUE) {
4978 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4979 curLength++;
4980 if (*keyPressed == '\r') {
4981 actualLength = curLength;
4982 }
4983 }
4984 }
4985 }
4986
4987 if (lpBuffer != NULL) {
4988 os::free(lpBuffer);
4989 }
4990
4991 *pbytes = (long) actualLength;
4992 return TRUE;
4993 }
4994
4995 // Map a block of memory.
4996 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4997 char *addr, size_t bytes, bool read_only,
4998 bool allow_exec) {
4999 HANDLE hFile;
5000 char* base;
5001
5002 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
5003 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
5004 if (hFile == NULL) {
5005 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
5006 return NULL;
5007 }
5008
5009 if (allow_exec) {
5010 // CreateFileMapping/MapViewOfFileEx can't map executable memory
5011 // unless it comes from a PE image (which the shared archive is not.)
5012 // Even VirtualProtect refuses to give execute access to mapped memory
5013 // that was not previously executable.
5014 //
5015 // Instead, stick the executable region in anonymous memory. Yuck.
5016 // Penalty is that ~4 pages will not be shareable - in the future
5017 // we might consider DLLizing the shared archive with a proper PE
5018 // header so that mapping executable + sharing is possible.
5019
5020 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
5021 PAGE_READWRITE);
5022 if (base == NULL) {
5023 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
5024 CloseHandle(hFile);
5025 return NULL;
5026 }
5027
5028 // Record virtual memory allocation
5029 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
5030
5031 DWORD bytes_read;
5032 OVERLAPPED overlapped;
5033 overlapped.Offset = (DWORD)file_offset;
5034 overlapped.OffsetHigh = 0;
5035 overlapped.hEvent = NULL;
5036 // ReadFile guarantees that if the return value is true, the requested
5037 // number of bytes were read before returning.
5038 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
5039 if (!res) {
5040 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
5041 release_memory(base, bytes);
5042 CloseHandle(hFile);
5043 return NULL;
5044 }
5045 } else {
5046 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
5047 NULL /* file_name */);
5048 if (hMap == NULL) {
5049 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
5050 CloseHandle(hFile);
5051 return NULL;
5052 }
5053
5054 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
5055 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
5056 (DWORD)bytes, addr);
5057 if (base == NULL) {
5058 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
5059 CloseHandle(hMap);
5060 CloseHandle(hFile);
5061 return NULL;
5062 }
5063
5064 if (CloseHandle(hMap) == 0) {
5065 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
5066 CloseHandle(hFile);
5067 return base;
5068 }
5069 }
5070
5071 if (allow_exec) {
5072 DWORD old_protect;
5073 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
5074 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
5075
5076 if (!res) {
5077 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
5078 // Don't consider this a hard error, on IA32 even if the
5079 // VirtualProtect fails, we should still be able to execute
5080 CloseHandle(hFile);
5081 return base;
5082 }
5083 }
5084
5085 if (CloseHandle(hFile) == 0) {
5086 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
5087 return base;
5088 }
5089
5090 return base;
5091 }
5092
5093
5094 // Remap a block of memory.
5095 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5096 char *addr, size_t bytes, bool read_only,
5097 bool allow_exec) {
5098 // This OS does not allow existing memory maps to be remapped so we
5099 // would have to unmap the memory before we remap it.
5100
5101 // Because there is a small window between unmapping memory and mapping
5102 // it in again with different protections, CDS archives are mapped RW
5103 // on windows, so this function isn't called.
5104 ShouldNotReachHere();
5105 return NULL;
5106 }
5107
5108
5109 // Unmap a block of memory.
5110 // Returns true=success, otherwise false.
5111
5112 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5113 MEMORY_BASIC_INFORMATION mem_info;
5114 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5115 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5116 return false;
5117 }
5118
5119 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5120 // Instead, executable region was allocated using VirtualAlloc(). See
5121 // pd_map_memory() above.
5122 //
5123 // The following flags should match the 'exec_access' flages used for
5124 // VirtualProtect() in pd_map_memory().
5125 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5126 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5127 return pd_release_memory(addr, bytes);
5128 }
5129
5130 BOOL result = UnmapViewOfFile(addr);
5131 if (result == 0) {
5132 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5133 return false;
5134 }
5135 return true;
5136 }
5137
5138 void os::pause() {
5139 char filename[MAX_PATH];
5140 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5141 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
5142 } else {
5143 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5144 }
5145
5146 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5147 if (fd != -1) {
5148 struct stat buf;
5149 ::close(fd);
5150 while (::stat(filename, &buf) == 0) {
5151 Sleep(100);
5152 }
5153 } else {
5154 jio_fprintf(stderr,
5155 "Could not open pause file '%s', continuing immediately.\n", filename);
5156 }
5157 }
5158
5159 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5160 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5161 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5162
5163 os::ThreadCrashProtection::ThreadCrashProtection() {
5164 }
5165
5166 // See the caveats for this class in os_windows.hpp
5167 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5168 // into this method and returns false. If no OS EXCEPTION was raised, returns
5169 // true.
5170 // The callback is supposed to provide the method that should be protected.
5171 //
5172 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5173
5174 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5175
5176 _protected_thread = Thread::current_or_null();
5177 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5178
5179 bool success = true;
5180 __try {
5181 _crash_protection = this;
5182 cb.call();
5183 } __except(EXCEPTION_EXECUTE_HANDLER) {
5184 // only for protection, nothing to do
5185 success = false;
5186 }
5187 _crash_protection = NULL;
5188 _protected_thread = NULL;
5189 Thread::muxRelease(&_crash_mux);
5190 return success;
5191 }
5192
5193
5194 class HighResolutionInterval : public CHeapObj<mtThread> {
5195 // The default timer resolution seems to be 10 milliseconds.
5196 // (Where is this written down?)
5197 // If someone wants to sleep for only a fraction of the default,
5198 // then we set the timer resolution down to 1 millisecond for
5199 // the duration of their interval.
5200 // We carefully set the resolution back, since otherwise we
5201 // seem to incur an overhead (3%?) that we don't need.
5202 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5203 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5204 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5205 // timeBeginPeriod() if the relative error exceeded some threshold.
5206 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5207 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5208 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5209 // resolution timers running.
5210 private:
5211 jlong resolution;
5212 public:
5213 HighResolutionInterval(jlong ms) {
5214 resolution = ms % 10L;
5215 if (resolution != 0) {
5216 MMRESULT result = timeBeginPeriod(1L);
5217 }
5218 }
5219 ~HighResolutionInterval() {
5220 if (resolution != 0) {
5221 MMRESULT result = timeEndPeriod(1L);
5222 }
5223 resolution = 0L;
5224 }
5225 };
5226
5227 // An Event wraps a win32 "CreateEvent" kernel handle.
5228 //
5229 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5230 //
5231 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5232 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5233 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5234 // In addition, an unpark() operation might fetch the handle field, but the
5235 // event could recycle between the fetch and the SetEvent() operation.
5236 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5237 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5238 // on an stale but recycled handle would be harmless, but in practice this might
5239 // confuse other non-Sun code, so it's not a viable approach.
5240 //
5241 // 2: Once a win32 event handle is associated with an Event, it remains associated
5242 // with the Event. The event handle is never closed. This could be construed
5243 // as handle leakage, but only up to the maximum # of threads that have been extant
5244 // at any one time. This shouldn't be an issue, as windows platforms typically
5245 // permit a process to have hundreds of thousands of open handles.
5246 //
5247 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5248 // and release unused handles.
5249 //
5250 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5251 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5252 //
5253 // 5. Use an RCU-like mechanism (Read-Copy Update).
5254 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5255 //
5256 // We use (2).
5257 //
5258 // TODO-FIXME:
5259 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5260 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5261 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5262 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5263 // into a single win32 CreateEvent() handle.
5264 //
5265 // Assumption:
5266 // Only one parker can exist on an event, which is why we allocate
5267 // them per-thread. Multiple unparkers can coexist.
5268 //
5269 // _Event transitions in park()
5270 // -1 => -1 : illegal
5271 // 1 => 0 : pass - return immediately
5272 // 0 => -1 : block; then set _Event to 0 before returning
5273 //
5274 // _Event transitions in unpark()
5275 // 0 => 1 : just return
5276 // 1 => 1 : just return
5277 // -1 => either 0 or 1; must signal target thread
5278 // That is, we can safely transition _Event from -1 to either
5279 // 0 or 1.
5280 //
5281 // _Event serves as a restricted-range semaphore.
5282 // -1 : thread is blocked, i.e. there is a waiter
5283 // 0 : neutral: thread is running or ready,
5284 // could have been signaled after a wait started
5285 // 1 : signaled - thread is running or ready
5286 //
5287 // Another possible encoding of _Event would be with
5288 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5289 //
5290
5291 int os::PlatformEvent::park(jlong Millis) {
5292 // Transitions for _Event:
5293 // -1 => -1 : illegal
5294 // 1 => 0 : pass - return immediately
5295 // 0 => -1 : block; then set _Event to 0 before returning
5296
5297 guarantee(_ParkHandle != NULL , "Invariant");
5298 guarantee(Millis > 0 , "Invariant");
5299
5300 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5301 // the initial park() operation.
5302 // Consider: use atomic decrement instead of CAS-loop
5303
5304 int v;
5305 for (;;) {
5306 v = _Event;
5307 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5308 }
5309 guarantee((v == 0) || (v == 1), "invariant");
5310 if (v != 0) return OS_OK;
5311
5312 // Do this the hard way by blocking ...
5313 // TODO: consider a brief spin here, gated on the success of recent
5314 // spin attempts by this thread.
5315 //
5316 // We decompose long timeouts into series of shorter timed waits.
5317 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5318 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5319 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5320 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5321 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5322 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5323 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5324 // for the already waited time. This policy does not admit any new outcomes.
5325 // In the future, however, we might want to track the accumulated wait time and
5326 // adjust Millis accordingly if we encounter a spurious wakeup.
5327
5328 const int MAXTIMEOUT = 0x10000000;
5329 DWORD rv = WAIT_TIMEOUT;
5330 while (_Event < 0 && Millis > 0) {
5331 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5332 if (Millis > MAXTIMEOUT) {
5333 prd = MAXTIMEOUT;
5334 }
5335 HighResolutionInterval *phri = NULL;
5336 if (!ForceTimeHighResolution) {
5337 phri = new HighResolutionInterval(prd);
5338 }
5339 rv = ::WaitForSingleObject(_ParkHandle, prd);
5340 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5341 if (rv == WAIT_TIMEOUT) {
5342 Millis -= prd;
5343 }
5344 delete phri; // if it is NULL, harmless
5345 }
5346 v = _Event;
5347 _Event = 0;
5348 // see comment at end of os::PlatformEvent::park() below:
5349 OrderAccess::fence();
5350 // If we encounter a nearly simultanous timeout expiry and unpark()
5351 // we return OS_OK indicating we awoke via unpark().
5352 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5353 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5354 }
5355
5356 void os::PlatformEvent::park() {
5357 // Transitions for _Event:
5358 // -1 => -1 : illegal
5359 // 1 => 0 : pass - return immediately
5360 // 0 => -1 : block; then set _Event to 0 before returning
5361
5362 guarantee(_ParkHandle != NULL, "Invariant");
5363 // Invariant: Only the thread associated with the Event/PlatformEvent
5364 // may call park().
5365 // Consider: use atomic decrement instead of CAS-loop
5366 int v;
5367 for (;;) {
5368 v = _Event;
5369 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5370 }
5371 guarantee((v == 0) || (v == 1), "invariant");
5372 if (v != 0) return;
5373
5374 // Do this the hard way by blocking ...
5375 // TODO: consider a brief spin here, gated on the success of recent
5376 // spin attempts by this thread.
5377 while (_Event < 0) {
5378 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5379 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5380 }
5381
5382 // Usually we'll find _Event == 0 at this point, but as
5383 // an optional optimization we clear it, just in case can
5384 // multiple unpark() operations drove _Event up to 1.
5385 _Event = 0;
5386 OrderAccess::fence();
5387 guarantee(_Event >= 0, "invariant");
5388 }
5389
5390 void os::PlatformEvent::unpark() {
5391 guarantee(_ParkHandle != NULL, "Invariant");
5392
5393 // Transitions for _Event:
5394 // 0 => 1 : just return
5395 // 1 => 1 : just return
5396 // -1 => either 0 or 1; must signal target thread
5397 // That is, we can safely transition _Event from -1 to either
5398 // 0 or 1.
5399 // See also: "Semaphores in Plan 9" by Mullender & Cox
5400 //
5401 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5402 // that it will take two back-to-back park() calls for the owning
5403 // thread to block. This has the benefit of forcing a spurious return
5404 // from the first park() call after an unpark() call which will help
5405 // shake out uses of park() and unpark() without condition variables.
5406
5407 if (Atomic::xchg(&_Event, 1) >= 0) return;
5408
5409 ::SetEvent(_ParkHandle);
5410 }
5411
5412
5413 // JSR166
5414 // -------------------------------------------------------
5415
5416 // The Windows implementation of Park is very straightforward: Basic
5417 // operations on Win32 Events turn out to have the right semantics to
5418 // use them directly. We opportunistically resuse the event inherited
5419 // from Monitor.
5420
5421 void Parker::park(bool isAbsolute, jlong time) {
5422 guarantee(_ParkEvent != NULL, "invariant");
5423 // First, demultiplex/decode time arguments
5424 if (time < 0) { // don't wait
5425 return;
5426 } else if (time == 0 && !isAbsolute) {
5427 time = INFINITE;
5428 } else if (isAbsolute) {
5429 time -= os::javaTimeMillis(); // convert to relative time
5430 if (time <= 0) { // already elapsed
5431 return;
5432 }
5433 } else { // relative
5434 time /= 1000000; // Must coarsen from nanos to millis
5435 if (time == 0) { // Wait for the minimal time unit if zero
5436 time = 1;
5437 }
5438 }
5439
5440 JavaThread* thread = JavaThread::current();
5441
5442 // Don't wait if interrupted or already triggered
5443 if (thread->is_interrupted(false) ||
5444 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5445 ResetEvent(_ParkEvent);
5446 return;
5447 } else {
5448 ThreadBlockInVM tbivm(thread);
5449 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5450 thread->set_suspend_equivalent();
5451
5452 WaitForSingleObject(_ParkEvent, time);
5453 ResetEvent(_ParkEvent);
5454
5455 // If externally suspended while waiting, re-suspend
5456 if (thread->handle_special_suspend_equivalent_condition()) {
5457 thread->java_suspend_self();
5458 }
5459 }
5460 }
5461
5462 void Parker::unpark() {
5463 guarantee(_ParkEvent != NULL, "invariant");
5464 SetEvent(_ParkEvent);
5465 }
5466
5467 // Platform Monitor implementation
5468
5469 // Must already be locked
5470 int os::PlatformMonitor::wait(jlong millis) {
5471 assert(millis >= 0, "negative timeout");
5472 int ret = OS_TIMEOUT;
5473 int status = SleepConditionVariableCS(&_cond, &_mutex,
5474 millis == 0 ? INFINITE : millis);
5475 if (status != 0) {
5476 ret = OS_OK;
5477 }
5478 #ifndef PRODUCT
5479 else {
5480 DWORD err = GetLastError();
5481 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5482 }
5483 #endif
5484 return ret;
5485 }
5486
5487 // Run the specified command in a separate process. Return its exit value,
5488 // or -1 on failure (e.g. can't create a new process).
5489 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5490 STARTUPINFO si;
5491 PROCESS_INFORMATION pi;
5492 DWORD exit_code;
5493
5494 char * cmd_string;
5495 const char * cmd_prefix = "cmd /C ";
5496 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5497 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5498 if (cmd_string == NULL) {
5499 return -1;
5500 }
5501 cmd_string[0] = '\0';
5502 strcat(cmd_string, cmd_prefix);
5503 strcat(cmd_string, cmd);
5504
5505 // now replace all '\n' with '&'
5506 char * substring = cmd_string;
5507 while ((substring = strchr(substring, '\n')) != NULL) {
5508 substring[0] = '&';
5509 substring++;
5510 }
5511 memset(&si, 0, sizeof(si));
5512 si.cb = sizeof(si);
5513 memset(&pi, 0, sizeof(pi));
5514 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5515 cmd_string, // command line
5516 NULL, // process security attribute
5517 NULL, // thread security attribute
5518 TRUE, // inherits system handles
5519 0, // no creation flags
5520 NULL, // use parent's environment block
5521 NULL, // use parent's starting directory
5522 &si, // (in) startup information
5523 &pi); // (out) process information
5524
5525 if (rslt) {
5526 // Wait until child process exits.
5527 WaitForSingleObject(pi.hProcess, INFINITE);
5528
5529 GetExitCodeProcess(pi.hProcess, &exit_code);
5530
5531 // Close process and thread handles.
5532 CloseHandle(pi.hProcess);
5533 CloseHandle(pi.hThread);
5534 } else {
5535 exit_code = -1;
5536 }
5537
5538 FREE_C_HEAP_ARRAY(char, cmd_string);
5539 return (int)exit_code;
5540 }
5541
5542 bool os::find(address addr, outputStream* st) {
5543 int offset = -1;
5544 bool result = false;
5545 char buf[256];
5546 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5547 st->print(PTR_FORMAT " ", addr);
5548 if (strlen(buf) < sizeof(buf) - 1) {
5549 char* p = strrchr(buf, '\\');
5550 if (p) {
5551 st->print("%s", p + 1);
5552 } else {
5553 st->print("%s", buf);
5554 }
5555 } else {
5556 // The library name is probably truncated. Let's omit the library name.
5557 // See also JDK-8147512.
5558 }
5559 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5560 st->print("::%s + 0x%x", buf, offset);
5561 }
5562 st->cr();
5563 result = true;
5564 }
5565 return result;
5566 }
5567
5568 static jint initSock() {
5569 WSADATA wsadata;
5570
5571 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5572 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5573 ::GetLastError());
5574 return JNI_ERR;
5575 }
5576 return JNI_OK;
5577 }
5578
5579 struct hostent* os::get_host_by_name(char* name) {
5580 return (struct hostent*)gethostbyname(name);
5581 }
5582
5583 int os::socket_close(int fd) {
5584 return ::closesocket(fd);
5585 }
5586
5587 int os::socket(int domain, int type, int protocol) {
5588 return ::socket(domain, type, protocol);
5589 }
5590
5591 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5592 return ::connect(fd, him, len);
5593 }
5594
5595 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5596 return ::recv(fd, buf, (int)nBytes, flags);
5597 }
5598
5599 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5600 return ::send(fd, buf, (int)nBytes, flags);
5601 }
5602
5603 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5604 return ::send(fd, buf, (int)nBytes, flags);
5605 }
5606
5607 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5608 #if defined(IA32)
5609 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5610 #elif defined (AMD64)
5611 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5612 #endif
5613
5614 // returns true if thread could be suspended,
5615 // false otherwise
5616 static bool do_suspend(HANDLE* h) {
5617 if (h != NULL) {
5618 if (SuspendThread(*h) != ~0) {
5619 return true;
5620 }
5621 }
5622 return false;
5623 }
5624
5625 // resume the thread
5626 // calling resume on an active thread is a no-op
5627 static void do_resume(HANDLE* h) {
5628 if (h != NULL) {
5629 ResumeThread(*h);
5630 }
5631 }
5632
5633 // retrieve a suspend/resume context capable handle
5634 // from the tid. Caller validates handle return value.
5635 void get_thread_handle_for_extended_context(HANDLE* h,
5636 OSThread::thread_id_t tid) {
5637 if (h != NULL) {
5638 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5639 }
5640 }
5641
5642 // Thread sampling implementation
5643 //
5644 void os::SuspendedThreadTask::internal_do_task() {
5645 CONTEXT ctxt;
5646 HANDLE h = NULL;
5647
5648 // get context capable handle for thread
5649 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5650
5651 // sanity
5652 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5653 return;
5654 }
5655
5656 // suspend the thread
5657 if (do_suspend(&h)) {
5658 ctxt.ContextFlags = sampling_context_flags;
5659 // get thread context
5660 GetThreadContext(h, &ctxt);
5661 SuspendedThreadTaskContext context(_thread, &ctxt);
5662 // pass context to Thread Sampling impl
5663 do_task(context);
5664 // resume thread
5665 do_resume(&h);
5666 }
5667
5668 // close handle
5669 CloseHandle(h);
5670 }
5671
5672 bool os::start_debugging(char *buf, int buflen) {
5673 int len = (int)strlen(buf);
5674 char *p = &buf[len];
5675
5676 jio_snprintf(p, buflen-len,
5677 "\n\n"
5678 "Do you want to debug the problem?\n\n"
5679 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5680 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5681 "Otherwise, select 'No' to abort...",
5682 os::current_process_id(), os::current_thread_id());
5683
5684 bool yes = os::message_box("Unexpected Error", buf);
5685
5686 if (yes) {
5687 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5688 // exception. If VM is running inside a debugger, the debugger will
5689 // catch the exception. Otherwise, the breakpoint exception will reach
5690 // the default windows exception handler, which can spawn a debugger and
5691 // automatically attach to the dying VM.
5692 os::breakpoint();
5693 yes = false;
5694 }
5695 return yes;
5696 }
5697
5698 void* os::get_default_process_handle() {
5699 return (void*)GetModuleHandle(NULL);
5700 }
5701
5702 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5703 // which is used to find statically linked in agents.
5704 // Additionally for windows, takes into account __stdcall names.
5705 // Parameters:
5706 // sym_name: Symbol in library we are looking for
5707 // lib_name: Name of library to look in, NULL for shared libs.
5708 // is_absolute_path == true if lib_name is absolute path to agent
5709 // such as "C:/a/b/L.dll"
5710 // == false if only the base name of the library is passed in
5711 // such as "L"
5712 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5713 bool is_absolute_path) {
5714 char *agent_entry_name;
5715 size_t len;
5716 size_t name_len;
5717 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5718 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5719 const char *start;
5720
5721 if (lib_name != NULL) {
5722 len = name_len = strlen(lib_name);
5723 if (is_absolute_path) {
5724 // Need to strip path, prefix and suffix
5725 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5726 lib_name = ++start;
5727 } else {
5728 // Need to check for drive prefix
5729 if ((start = strchr(lib_name, ':')) != NULL) {
5730 lib_name = ++start;
5731 }
5732 }
5733 if (len <= (prefix_len + suffix_len)) {
5734 return NULL;
5735 }
5736 lib_name += prefix_len;
5737 name_len = strlen(lib_name) - suffix_len;
5738 }
5739 }
5740 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5741 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5742 if (agent_entry_name == NULL) {
5743 return NULL;
5744 }
5745 if (lib_name != NULL) {
5746 const char *p = strrchr(sym_name, '@');
5747 if (p != NULL && p != sym_name) {
5748 // sym_name == _Agent_OnLoad@XX
5749 strncpy(agent_entry_name, sym_name, (p - sym_name));
5750 agent_entry_name[(p-sym_name)] = '\0';
5751 // agent_entry_name == _Agent_OnLoad
5752 strcat(agent_entry_name, "_");
5753 strncat(agent_entry_name, lib_name, name_len);
5754 strcat(agent_entry_name, p);
5755 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5756 } else {
5757 strcpy(agent_entry_name, sym_name);
5758 strcat(agent_entry_name, "_");
5759 strncat(agent_entry_name, lib_name, name_len);
5760 }
5761 } else {
5762 strcpy(agent_entry_name, sym_name);
5763 }
5764 return agent_entry_name;
5765 }
5766
5767 #ifndef PRODUCT
5768
5769 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5770 // contiguous memory block at a particular address.
5771 // The test first tries to find a good approximate address to allocate at by using the same
5772 // method to allocate some memory at any address. The test then tries to allocate memory in
5773 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5774 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5775 // the previously allocated memory is available for allocation. The only actual failure
5776 // that is reported is when the test tries to allocate at a particular location but gets a
5777 // different valid one. A NULL return value at this point is not considered an error but may
5778 // be legitimate.
5779 void TestReserveMemorySpecial_test() {
5780 if (!UseLargePages) {
5781 return;
5782 }
5783 // save current value of globals
5784 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5785 bool old_use_numa_interleaving = UseNUMAInterleaving;
5786
5787 // set globals to make sure we hit the correct code path
5788 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5789
5790 // do an allocation at an address selected by the OS to get a good one.
5791 const size_t large_allocation_size = os::large_page_size() * 4;
5792 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5793 if (result == NULL) {
5794 } else {
5795 os::release_memory_special(result, large_allocation_size);
5796
5797 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5798 // we managed to get it once.
5799 const size_t expected_allocation_size = os::large_page_size();
5800 char* expected_location = result + os::large_page_size();
5801 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5802 if (actual_location == NULL) {
5803 } else {
5804 // release memory
5805 os::release_memory_special(actual_location, expected_allocation_size);
5806 // only now check, after releasing any memory to avoid any leaks.
5807 assert(actual_location == expected_location,
5808 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5809 expected_location, expected_allocation_size, actual_location);
5810 }
5811 }
5812
5813 // restore globals
5814 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5815 UseNUMAInterleaving = old_use_numa_interleaving;
5816 }
5817 #endif // PRODUCT
5818
5819 /*
5820 All the defined signal names for Windows.
5821
5822 NOTE that not all of these names are accepted by FindSignal!
5823
5824 For various reasons some of these may be rejected at runtime.
5825
5826 Here are the names currently accepted by a user of sun.misc.Signal with
5827 1.4.1 (ignoring potential interaction with use of chaining, etc):
5828
5829 (LIST TBD)
5830
5831 */
5832 int os::get_signal_number(const char* name) {
5833 static const struct {
5834 const char* name;
5835 int number;
5836 } siglabels [] =
5837 // derived from version 6.0 VC98/include/signal.h
5838 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5839 "FPE", SIGFPE, // floating point exception
5840 "SEGV", SIGSEGV, // segment violation
5841 "INT", SIGINT, // interrupt
5842 "TERM", SIGTERM, // software term signal from kill
5843 "BREAK", SIGBREAK, // Ctrl-Break sequence
5844 "ILL", SIGILL}; // illegal instruction
5845 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5846 if (strcmp(name, siglabels[i].name) == 0) {
5847 return siglabels[i].number;
5848 }
5849 }
5850 return -1;
5851 }
5852
5853 // Fast current thread access
5854
5855 int os::win32::_thread_ptr_offset = 0;
5856
5857 static void call_wrapper_dummy() {}
5858
5859 // We need to call the os_exception_wrapper once so that it sets
5860 // up the offset from FS of the thread pointer.
5861 void os::win32::initialize_thread_ptr_offset() {
5862 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5863 NULL, methodHandle(), NULL, NULL);
5864 }
5865
5866 bool os::supports_map_sync() {
5867 return false;
5868 }