1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/statSampler.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/thread.inline.hpp"
64 #include "runtime/threadCritical.hpp"
65 #include "runtime/timer.hpp"
66 #include "runtime/vm_version.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/decoder.hpp"
72 #include "utilities/defaultStream.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79 #ifdef _DEBUG
80 #include <crtdbg.h>
81 #endif
82
83 #include <windows.h>
84 #include <sys/types.h>
85 #include <sys/stat.h>
86 #include <sys/timeb.h>
87 #include <objidl.h>
88 #include <shlobj.h>
89
90 #include <malloc.h>
91 #include <signal.h>
92 #include <direct.h>
93 #include <errno.h>
94 #include <fcntl.h>
95 #include <io.h>
96 #include <process.h> // For _beginthreadex(), _endthreadex()
97 #include <imagehlp.h> // For os::dll_address_to_function_name
98 // for enumerating dll libraries
99 #include <vdmdbg.h>
100 #include <psapi.h>
101 #include <mmsystem.h>
102 #include <winsock2.h>
103
104 // for timer info max values which include all bits
105 #define ALL_64_BITS CONST64(-1)
106
107 // For DLL loading/load error detection
108 // Values of PE COFF
109 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
110 #define IMAGE_FILE_SIGNATURE_LENGTH 4
111
112 static HANDLE main_process;
113 static HANDLE main_thread;
114 static int main_thread_id;
115
116 static FILETIME process_creation_time;
117 static FILETIME process_exit_time;
118 static FILETIME process_user_time;
119 static FILETIME process_kernel_time;
120
121 #ifdef _M_AMD64
122 #define __CPU__ amd64
123 #else
124 #define __CPU__ i486
125 #endif
126
127 #if INCLUDE_AOT
128 PVOID topLevelVectoredExceptionHandler = NULL;
129 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
130 #endif
131
132 // save DLL module handle, used by GetModuleFileName
133
134 HINSTANCE vm_lib_handle;
135
136 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
137 switch (reason) {
138 case DLL_PROCESS_ATTACH:
139 vm_lib_handle = hinst;
140 if (ForceTimeHighResolution) {
141 timeBeginPeriod(1L);
142 }
143 WindowsDbgHelp::pre_initialize();
144 SymbolEngine::pre_initialize();
145 break;
146 case DLL_PROCESS_DETACH:
147 if (ForceTimeHighResolution) {
148 timeEndPeriod(1L);
149 }
150 #if INCLUDE_AOT
151 if (topLevelVectoredExceptionHandler != NULL) {
152 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
153 topLevelVectoredExceptionHandler = NULL;
154 }
155 #endif
156 break;
157 default:
158 break;
159 }
160 return true;
161 }
162
163 static inline double fileTimeAsDouble(FILETIME* time) {
164 const double high = (double) ((unsigned int) ~0);
165 const double split = 10000000.0;
166 double result = (time->dwLowDateTime / split) +
167 time->dwHighDateTime * (high/split);
168 return result;
169 }
170
171 // Implementation of os
172
173 bool os::unsetenv(const char* name) {
174 assert(name != NULL, "Null pointer");
175 return (SetEnvironmentVariable(name, NULL) == TRUE);
176 }
177
178 // No setuid programs under Windows.
179 bool os::have_special_privileges() {
180 return false;
181 }
182
183
184 // This method is a periodic task to check for misbehaving JNI applications
185 // under CheckJNI, we can add any periodic checks here.
186 // For Windows at the moment does nothing
187 void os::run_periodic_checks() {
188 return;
189 }
190
191 // previous UnhandledExceptionFilter, if there is one
192 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
193
194 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
195
196 void os::init_system_properties_values() {
197 // sysclasspath, java_home, dll_dir
198 {
199 char *home_path;
200 char *dll_path;
201 char *pslash;
202 const char *bin = "\\bin";
203 char home_dir[MAX_PATH + 1];
204 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
205
206 if (alt_home_dir != NULL) {
207 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
208 home_dir[MAX_PATH] = '\0';
209 } else {
210 os::jvm_path(home_dir, sizeof(home_dir));
211 // Found the full path to jvm.dll.
212 // Now cut the path to <java_home>/jre if we can.
213 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
214 pslash = strrchr(home_dir, '\\');
215 if (pslash != NULL) {
216 *pslash = '\0'; // get rid of \{client|server}
217 pslash = strrchr(home_dir, '\\');
218 if (pslash != NULL) {
219 *pslash = '\0'; // get rid of \bin
220 }
221 }
222 }
223
224 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
225 strcpy(home_path, home_dir);
226 Arguments::set_java_home(home_path);
227 FREE_C_HEAP_ARRAY(char, home_path);
228
229 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
230 mtInternal);
231 strcpy(dll_path, home_dir);
232 strcat(dll_path, bin);
233 Arguments::set_dll_dir(dll_path);
234 FREE_C_HEAP_ARRAY(char, dll_path);
235
236 if (!set_boot_path('\\', ';')) {
237 vm_exit_during_initialization("Failed setting boot class path.", NULL);
238 }
239 }
240
241 // library_path
242 #define EXT_DIR "\\lib\\ext"
243 #define BIN_DIR "\\bin"
244 #define PACKAGE_DIR "\\Sun\\Java"
245 {
246 // Win32 library search order (See the documentation for LoadLibrary):
247 //
248 // 1. The directory from which application is loaded.
249 // 2. The system wide Java Extensions directory (Java only)
250 // 3. System directory (GetSystemDirectory)
251 // 4. Windows directory (GetWindowsDirectory)
252 // 5. The PATH environment variable
253 // 6. The current directory
254
255 char *library_path;
256 char tmp[MAX_PATH];
257 char *path_str = ::getenv("PATH");
258
259 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
260 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
261
262 library_path[0] = '\0';
263
264 GetModuleFileName(NULL, tmp, sizeof(tmp));
265 *(strrchr(tmp, '\\')) = '\0';
266 strcat(library_path, tmp);
267
268 GetWindowsDirectory(tmp, sizeof(tmp));
269 strcat(library_path, ";");
270 strcat(library_path, tmp);
271 strcat(library_path, PACKAGE_DIR BIN_DIR);
272
273 GetSystemDirectory(tmp, sizeof(tmp));
274 strcat(library_path, ";");
275 strcat(library_path, tmp);
276
277 GetWindowsDirectory(tmp, sizeof(tmp));
278 strcat(library_path, ";");
279 strcat(library_path, tmp);
280
281 if (path_str) {
282 strcat(library_path, ";");
283 strcat(library_path, path_str);
284 }
285
286 strcat(library_path, ";.");
287
288 Arguments::set_library_path(library_path);
289 FREE_C_HEAP_ARRAY(char, library_path);
290 }
291
292 // Default extensions directory
293 {
294 char path[MAX_PATH];
295 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
296 GetWindowsDirectory(path, MAX_PATH);
297 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
298 path, PACKAGE_DIR, EXT_DIR);
299 Arguments::set_ext_dirs(buf);
300 }
301 #undef EXT_DIR
302 #undef BIN_DIR
303 #undef PACKAGE_DIR
304
305 #ifndef _WIN64
306 // set our UnhandledExceptionFilter and save any previous one
307 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
308 #endif
309
310 // Done
311 return;
312 }
313
314 void os::breakpoint() {
315 DebugBreak();
316 }
317
318 // Invoked from the BREAKPOINT Macro
319 extern "C" void breakpoint() {
320 os::breakpoint();
321 }
322
323 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
324 // So far, this method is only used by Native Memory Tracking, which is
325 // only supported on Windows XP or later.
326 //
327 int os::get_native_stack(address* stack, int frames, int toSkip) {
328 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
329 for (int index = captured; index < frames; index ++) {
330 stack[index] = NULL;
331 }
332 return captured;
333 }
334
335
336 // os::current_stack_base()
337 //
338 // Returns the base of the stack, which is the stack's
339 // starting address. This function must be called
340 // while running on the stack of the thread being queried.
341
342 address os::current_stack_base() {
343 MEMORY_BASIC_INFORMATION minfo;
344 address stack_bottom;
345 size_t stack_size;
346
347 VirtualQuery(&minfo, &minfo, sizeof(minfo));
348 stack_bottom = (address)minfo.AllocationBase;
349 stack_size = minfo.RegionSize;
350
351 // Add up the sizes of all the regions with the same
352 // AllocationBase.
353 while (1) {
354 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
355 if (stack_bottom == (address)minfo.AllocationBase) {
356 stack_size += minfo.RegionSize;
357 } else {
358 break;
359 }
360 }
361 return stack_bottom + stack_size;
362 }
363
364 size_t os::current_stack_size() {
365 size_t sz;
366 MEMORY_BASIC_INFORMATION minfo;
367 VirtualQuery(&minfo, &minfo, sizeof(minfo));
368 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
369 return sz;
370 }
371
372 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
373 MEMORY_BASIC_INFORMATION minfo;
374 committed_start = NULL;
375 committed_size = 0;
376 address top = start + size;
377 const address start_addr = start;
378 while (start < top) {
379 VirtualQuery(start, &minfo, sizeof(minfo));
380 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
381 if (committed_start != NULL) {
382 break;
383 }
384 } else { // committed
385 if (committed_start == NULL) {
386 committed_start = start;
387 }
388 size_t offset = start - (address)minfo.BaseAddress;
389 committed_size += minfo.RegionSize - offset;
390 }
391 start = (address)minfo.BaseAddress + minfo.RegionSize;
392 }
393
394 if (committed_start == NULL) {
395 assert(committed_size == 0, "Sanity");
396 return false;
397 } else {
398 assert(committed_start >= start_addr && committed_start < top, "Out of range");
399 // current region may go beyond the limit, trim to the limit
400 committed_size = MIN2(committed_size, size_t(top - committed_start));
401 return true;
402 }
403 }
404
405 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
406 const struct tm* time_struct_ptr = localtime(clock);
407 if (time_struct_ptr != NULL) {
408 *res = *time_struct_ptr;
409 return res;
410 }
411 return NULL;
412 }
413
414 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
415 const struct tm* time_struct_ptr = gmtime(clock);
416 if (time_struct_ptr != NULL) {
417 *res = *time_struct_ptr;
418 return res;
419 }
420 return NULL;
421 }
422
423 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
424
425 // Thread start routine for all newly created threads
426 static unsigned __stdcall thread_native_entry(Thread* thread) {
427
428 thread->record_stack_base_and_size();
429
430 // Try to randomize the cache line index of hot stack frames.
431 // This helps when threads of the same stack traces evict each other's
432 // cache lines. The threads can be either from the same JVM instance, or
433 // from different JVM instances. The benefit is especially true for
434 // processors with hyperthreading technology.
435 static int counter = 0;
436 int pid = os::current_process_id();
437 _alloca(((pid ^ counter++) & 7) * 128);
438
439 thread->initialize_thread_current();
440
441 OSThread* osthr = thread->osthread();
442 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
443
444 if (UseNUMA) {
445 int lgrp_id = os::numa_get_group_id();
446 if (lgrp_id != -1) {
447 thread->set_lgrp_id(lgrp_id);
448 }
449 }
450
451 // Diagnostic code to investigate JDK-6573254
452 int res = 30115; // non-java thread
453 if (thread->is_Java_thread()) {
454 res = 20115; // java thread
455 }
456
457 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
458
459 // Install a win32 structured exception handler around every thread created
460 // by VM, so VM can generate error dump when an exception occurred in non-
461 // Java thread (e.g. VM thread).
462 __try {
463 thread->call_run();
464 } __except(topLevelExceptionFilter(
465 (_EXCEPTION_POINTERS*)_exception_info())) {
466 // Nothing to do.
467 }
468
469 // Note: at this point the thread object may already have deleted itself.
470 // Do not dereference it from here on out.
471
472 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
473
474 // One less thread is executing
475 // When the VMThread gets here, the main thread may have already exited
476 // which frees the CodeHeap containing the Atomic::add code
477 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
478 Atomic::dec(&os::win32::_os_thread_count);
479 }
480
481 // Thread must not return from exit_process_or_thread(), but if it does,
482 // let it proceed to exit normally
483 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
484 }
485
486 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
487 int thread_id) {
488 // Allocate the OSThread object
489 OSThread* osthread = new OSThread(NULL, NULL);
490 if (osthread == NULL) return NULL;
491
492 // Initialize the JDK library's interrupt event.
493 // This should really be done when OSThread is constructed,
494 // but there is no way for a constructor to report failure to
495 // allocate the event.
496 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
497 if (interrupt_event == NULL) {
498 delete osthread;
499 return NULL;
500 }
501 osthread->set_interrupt_event(interrupt_event);
502
503 // Store info on the Win32 thread into the OSThread
504 osthread->set_thread_handle(thread_handle);
505 osthread->set_thread_id(thread_id);
506
507 if (UseNUMA) {
508 int lgrp_id = os::numa_get_group_id();
509 if (lgrp_id != -1) {
510 thread->set_lgrp_id(lgrp_id);
511 }
512 }
513
514 // Initial thread state is INITIALIZED, not SUSPENDED
515 osthread->set_state(INITIALIZED);
516
517 return osthread;
518 }
519
520
521 bool os::create_attached_thread(JavaThread* thread) {
522 #ifdef ASSERT
523 thread->verify_not_published();
524 #endif
525 HANDLE thread_h;
526 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
527 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
528 fatal("DuplicateHandle failed\n");
529 }
530 OSThread* osthread = create_os_thread(thread, thread_h,
531 (int)current_thread_id());
532 if (osthread == NULL) {
533 return false;
534 }
535
536 // Initial thread state is RUNNABLE
537 osthread->set_state(RUNNABLE);
538
539 thread->set_osthread(osthread);
540
541 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
542 os::current_thread_id());
543
544 return true;
545 }
546
547 bool os::create_main_thread(JavaThread* thread) {
548 #ifdef ASSERT
549 thread->verify_not_published();
550 #endif
551 if (_starting_thread == NULL) {
552 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
553 if (_starting_thread == NULL) {
554 return false;
555 }
556 }
557
558 // The primordial thread is runnable from the start)
559 _starting_thread->set_state(RUNNABLE);
560
561 thread->set_osthread(_starting_thread);
562 return true;
563 }
564
565 // Helper function to trace _beginthreadex attributes,
566 // similar to os::Posix::describe_pthread_attr()
567 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
568 size_t stacksize, unsigned initflag) {
569 stringStream ss(buf, buflen);
570 if (stacksize == 0) {
571 ss.print("stacksize: default, ");
572 } else {
573 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
574 }
575 ss.print("flags: ");
576 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
577 #define ALL(X) \
578 X(CREATE_SUSPENDED) \
579 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
580 ALL(PRINT_FLAG)
581 #undef ALL
582 #undef PRINT_FLAG
583 return buf;
584 }
585
586 // Allocate and initialize a new OSThread
587 bool os::create_thread(Thread* thread, ThreadType thr_type,
588 size_t stack_size) {
589 unsigned thread_id;
590
591 // Allocate the OSThread object
592 OSThread* osthread = new OSThread(NULL, NULL);
593 if (osthread == NULL) {
594 return false;
595 }
596
597 // Initialize the JDK library's interrupt event.
598 // This should really be done when OSThread is constructed,
599 // but there is no way for a constructor to report failure to
600 // allocate the event.
601 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
602 if (interrupt_event == NULL) {
603 delete osthread;
604 return false;
605 }
606 osthread->set_interrupt_event(interrupt_event);
607 // We don't call set_interrupted(false) as it will trip the assert in there
608 // as we are not operating on the current thread. We don't need to call it
609 // because the initial state is already correct.
610
611 thread->set_osthread(osthread);
612
613 if (stack_size == 0) {
614 switch (thr_type) {
615 case os::java_thread:
616 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
617 if (JavaThread::stack_size_at_create() > 0) {
618 stack_size = JavaThread::stack_size_at_create();
619 }
620 break;
621 case os::compiler_thread:
622 if (CompilerThreadStackSize > 0) {
623 stack_size = (size_t)(CompilerThreadStackSize * K);
624 break;
625 } // else fall through:
626 // use VMThreadStackSize if CompilerThreadStackSize is not defined
627 case os::vm_thread:
628 case os::pgc_thread:
629 case os::cgc_thread:
630 case os::watcher_thread:
631 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
632 break;
633 }
634 }
635
636 // Create the Win32 thread
637 //
638 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
639 // does not specify stack size. Instead, it specifies the size of
640 // initially committed space. The stack size is determined by
641 // PE header in the executable. If the committed "stack_size" is larger
642 // than default value in the PE header, the stack is rounded up to the
643 // nearest multiple of 1MB. For example if the launcher has default
644 // stack size of 320k, specifying any size less than 320k does not
645 // affect the actual stack size at all, it only affects the initial
646 // commitment. On the other hand, specifying 'stack_size' larger than
647 // default value may cause significant increase in memory usage, because
648 // not only the stack space will be rounded up to MB, but also the
649 // entire space is committed upfront.
650 //
651 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
652 // for CreateThread() that can treat 'stack_size' as stack size. However we
653 // are not supposed to call CreateThread() directly according to MSDN
654 // document because JVM uses C runtime library. The good news is that the
655 // flag appears to work with _beginthredex() as well.
656
657 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
658 HANDLE thread_handle =
659 (HANDLE)_beginthreadex(NULL,
660 (unsigned)stack_size,
661 (unsigned (__stdcall *)(void*)) thread_native_entry,
662 thread,
663 initflag,
664 &thread_id);
665
666 char buf[64];
667 if (thread_handle != NULL) {
668 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
669 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
670 } else {
671 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
672 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
673 // Log some OS information which might explain why creating the thread failed.
674 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
675 LogStream st(Log(os, thread)::info());
676 os::print_memory_info(&st);
677 }
678
679 if (thread_handle == NULL) {
680 // Need to clean up stuff we've allocated so far
681 thread->set_osthread(NULL);
682 delete osthread;
683 return false;
684 }
685
686 Atomic::inc(&os::win32::_os_thread_count);
687
688 // Store info on the Win32 thread into the OSThread
689 osthread->set_thread_handle(thread_handle);
690 osthread->set_thread_id(thread_id);
691
692 // Initial thread state is INITIALIZED, not SUSPENDED
693 osthread->set_state(INITIALIZED);
694
695 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
696 return true;
697 }
698
699
700 // Free Win32 resources related to the OSThread
701 void os::free_thread(OSThread* osthread) {
702 assert(osthread != NULL, "osthread not set");
703
704 // We are told to free resources of the argument thread,
705 // but we can only really operate on the current thread.
706 assert(Thread::current()->osthread() == osthread,
707 "os::free_thread but not current thread");
708
709 CloseHandle(osthread->thread_handle());
710 delete osthread;
711 }
712
713 static jlong first_filetime;
714 static jlong initial_performance_count;
715 static jlong performance_frequency;
716
717
718 jlong as_long(LARGE_INTEGER x) {
719 jlong result = 0; // initialization to avoid warning
720 set_high(&result, x.HighPart);
721 set_low(&result, x.LowPart);
722 return result;
723 }
724
725
726 jlong os::elapsed_counter() {
727 LARGE_INTEGER count;
728 QueryPerformanceCounter(&count);
729 return as_long(count) - initial_performance_count;
730 }
731
732
733 jlong os::elapsed_frequency() {
734 return performance_frequency;
735 }
736
737
738 julong os::available_memory() {
739 return win32::available_memory();
740 }
741
742 julong os::win32::available_memory() {
743 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
744 // value if total memory is larger than 4GB
745 MEMORYSTATUSEX ms;
746 ms.dwLength = sizeof(ms);
747 GlobalMemoryStatusEx(&ms);
748
749 return (julong)ms.ullAvailPhys;
750 }
751
752 julong os::physical_memory() {
753 return win32::physical_memory();
754 }
755
756 bool os::has_allocatable_memory_limit(julong* limit) {
757 MEMORYSTATUSEX ms;
758 ms.dwLength = sizeof(ms);
759 GlobalMemoryStatusEx(&ms);
760 #ifdef _LP64
761 *limit = (julong)ms.ullAvailVirtual;
762 return true;
763 #else
764 // Limit to 1400m because of the 2gb address space wall
765 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
766 return true;
767 #endif
768 }
769
770 int os::active_processor_count() {
771 // User has overridden the number of active processors
772 if (ActiveProcessorCount > 0) {
773 log_trace(os)("active_processor_count: "
774 "active processor count set by user : %d",
775 ActiveProcessorCount);
776 return ActiveProcessorCount;
777 }
778
779 DWORD_PTR lpProcessAffinityMask = 0;
780 DWORD_PTR lpSystemAffinityMask = 0;
781 int proc_count = processor_count();
782 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
783 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
784 // Nof active processors is number of bits in process affinity mask
785 int bitcount = 0;
786 while (lpProcessAffinityMask != 0) {
787 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
788 bitcount++;
789 }
790 return bitcount;
791 } else {
792 return proc_count;
793 }
794 }
795
796 uint os::processor_id() {
797 return (uint)GetCurrentProcessorNumber();
798 }
799
800 void os::set_native_thread_name(const char *name) {
801
802 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
803 //
804 // Note that unfortunately this only works if the process
805 // is already attached to a debugger; debugger must observe
806 // the exception below to show the correct name.
807
808 // If there is no debugger attached skip raising the exception
809 if (!IsDebuggerPresent()) {
810 return;
811 }
812
813 const DWORD MS_VC_EXCEPTION = 0x406D1388;
814 struct {
815 DWORD dwType; // must be 0x1000
816 LPCSTR szName; // pointer to name (in user addr space)
817 DWORD dwThreadID; // thread ID (-1=caller thread)
818 DWORD dwFlags; // reserved for future use, must be zero
819 } info;
820
821 info.dwType = 0x1000;
822 info.szName = name;
823 info.dwThreadID = -1;
824 info.dwFlags = 0;
825
826 __try {
827 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
828 } __except(EXCEPTION_EXECUTE_HANDLER) {}
829 }
830
831 bool os::bind_to_processor(uint processor_id) {
832 // Not yet implemented.
833 return false;
834 }
835
836 void os::win32::initialize_performance_counter() {
837 LARGE_INTEGER count;
838 QueryPerformanceFrequency(&count);
839 performance_frequency = as_long(count);
840 QueryPerformanceCounter(&count);
841 initial_performance_count = as_long(count);
842 }
843
844
845 double os::elapsedTime() {
846 return (double) elapsed_counter() / (double) elapsed_frequency();
847 }
848
849
850 // Windows format:
851 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
852 // Java format:
853 // Java standards require the number of milliseconds since 1/1/1970
854
855 // Constant offset - calculated using offset()
856 static jlong _offset = 116444736000000000;
857 // Fake time counter for reproducible results when debugging
858 static jlong fake_time = 0;
859
860 #ifdef ASSERT
861 // Just to be safe, recalculate the offset in debug mode
862 static jlong _calculated_offset = 0;
863 static int _has_calculated_offset = 0;
864
865 jlong offset() {
866 if (_has_calculated_offset) return _calculated_offset;
867 SYSTEMTIME java_origin;
868 java_origin.wYear = 1970;
869 java_origin.wMonth = 1;
870 java_origin.wDayOfWeek = 0; // ignored
871 java_origin.wDay = 1;
872 java_origin.wHour = 0;
873 java_origin.wMinute = 0;
874 java_origin.wSecond = 0;
875 java_origin.wMilliseconds = 0;
876 FILETIME jot;
877 if (!SystemTimeToFileTime(&java_origin, &jot)) {
878 fatal("Error = %d\nWindows error", GetLastError());
879 }
880 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
881 _has_calculated_offset = 1;
882 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
883 return _calculated_offset;
884 }
885 #else
886 jlong offset() {
887 return _offset;
888 }
889 #endif
890
891 jlong windows_to_java_time(FILETIME wt) {
892 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
893 return (a - offset()) / 10000;
894 }
895
896 // Returns time ticks in (10th of micro seconds)
897 jlong windows_to_time_ticks(FILETIME wt) {
898 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
899 return (a - offset());
900 }
901
902 FILETIME java_to_windows_time(jlong l) {
903 jlong a = (l * 10000) + offset();
904 FILETIME result;
905 result.dwHighDateTime = high(a);
906 result.dwLowDateTime = low(a);
907 return result;
908 }
909
910 bool os::supports_vtime() { return true; }
911
912 double os::elapsedVTime() {
913 FILETIME created;
914 FILETIME exited;
915 FILETIME kernel;
916 FILETIME user;
917 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
918 // the resolution of windows_to_java_time() should be sufficient (ms)
919 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
920 } else {
921 return elapsedTime();
922 }
923 }
924
925 jlong os::javaTimeMillis() {
926 FILETIME wt;
927 GetSystemTimeAsFileTime(&wt);
928 return windows_to_java_time(wt);
929 }
930
931 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
932 FILETIME wt;
933 GetSystemTimeAsFileTime(&wt);
934 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
935 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
936 seconds = secs;
937 nanos = jlong(ticks - (secs*10000000)) * 100;
938 }
939
940 jlong os::javaTimeNanos() {
941 LARGE_INTEGER current_count;
942 QueryPerformanceCounter(¤t_count);
943 double current = as_long(current_count);
944 double freq = performance_frequency;
945 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
946 return time;
947 }
948
949 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
950 jlong freq = performance_frequency;
951 if (freq < NANOSECS_PER_SEC) {
952 // the performance counter is 64 bits and we will
953 // be multiplying it -- so no wrap in 64 bits
954 info_ptr->max_value = ALL_64_BITS;
955 } else if (freq > NANOSECS_PER_SEC) {
956 // use the max value the counter can reach to
957 // determine the max value which could be returned
958 julong max_counter = (julong)ALL_64_BITS;
959 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
960 } else {
961 // the performance counter is 64 bits and we will
962 // be using it directly -- so no wrap in 64 bits
963 info_ptr->max_value = ALL_64_BITS;
964 }
965
966 // using a counter, so no skipping
967 info_ptr->may_skip_backward = false;
968 info_ptr->may_skip_forward = false;
969
970 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
971 }
972
973 char* os::local_time_string(char *buf, size_t buflen) {
974 SYSTEMTIME st;
975 GetLocalTime(&st);
976 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
977 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
978 return buf;
979 }
980
981 bool os::getTimesSecs(double* process_real_time,
982 double* process_user_time,
983 double* process_system_time) {
984 HANDLE h_process = GetCurrentProcess();
985 FILETIME create_time, exit_time, kernel_time, user_time;
986 BOOL result = GetProcessTimes(h_process,
987 &create_time,
988 &exit_time,
989 &kernel_time,
990 &user_time);
991 if (result != 0) {
992 FILETIME wt;
993 GetSystemTimeAsFileTime(&wt);
994 jlong rtc_millis = windows_to_java_time(wt);
995 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
996 *process_user_time =
997 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
998 *process_system_time =
999 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1000 return true;
1001 } else {
1002 return false;
1003 }
1004 }
1005
1006 void os::shutdown() {
1007 // allow PerfMemory to attempt cleanup of any persistent resources
1008 perfMemory_exit();
1009
1010 // flush buffered output, finish log files
1011 ostream_abort();
1012
1013 // Check for abort hook
1014 abort_hook_t abort_hook = Arguments::abort_hook();
1015 if (abort_hook != NULL) {
1016 abort_hook();
1017 }
1018 }
1019
1020
1021 static HANDLE dumpFile = NULL;
1022
1023 // Check if dump file can be created.
1024 void os::check_dump_limit(char* buffer, size_t buffsz) {
1025 bool status = true;
1026 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1027 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1028 status = false;
1029 }
1030
1031 #ifndef ASSERT
1032 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1033 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1034 status = false;
1035 }
1036 #endif
1037
1038 if (status) {
1039 const char* cwd = get_current_directory(NULL, 0);
1040 int pid = current_process_id();
1041 if (cwd != NULL) {
1042 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1043 } else {
1044 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1045 }
1046
1047 if (dumpFile == NULL &&
1048 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1049 == INVALID_HANDLE_VALUE) {
1050 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1051 status = false;
1052 }
1053 }
1054 VMError::record_coredump_status(buffer, status);
1055 }
1056
1057 void os::abort(bool dump_core, void* siginfo, const void* context) {
1058 EXCEPTION_POINTERS ep;
1059 MINIDUMP_EXCEPTION_INFORMATION mei;
1060 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1061
1062 HANDLE hProcess = GetCurrentProcess();
1063 DWORD processId = GetCurrentProcessId();
1064 MINIDUMP_TYPE dumpType;
1065
1066 shutdown();
1067 if (!dump_core || dumpFile == NULL) {
1068 if (dumpFile != NULL) {
1069 CloseHandle(dumpFile);
1070 }
1071 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1072 }
1073
1074 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1075 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1076
1077 if (siginfo != NULL && context != NULL) {
1078 ep.ContextRecord = (PCONTEXT) context;
1079 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1080
1081 mei.ThreadId = GetCurrentThreadId();
1082 mei.ExceptionPointers = &ep;
1083 pmei = &mei;
1084 } else {
1085 pmei = NULL;
1086 }
1087
1088 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1089 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1090 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1091 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1092 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1093 }
1094 CloseHandle(dumpFile);
1095 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1096 }
1097
1098 // Die immediately, no exit hook, no abort hook, no cleanup.
1099 void os::die() {
1100 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1101 }
1102
1103 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1104 // * dirent_md.c 1.15 00/02/02
1105 //
1106 // The declarations for DIR and struct dirent are in jvm_win32.h.
1107
1108 // Caller must have already run dirname through JVM_NativePath, which removes
1109 // duplicate slashes and converts all instances of '/' into '\\'.
1110
1111 DIR * os::opendir(const char *dirname) {
1112 assert(dirname != NULL, "just checking"); // hotspot change
1113 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1114 DWORD fattr; // hotspot change
1115 char alt_dirname[4] = { 0, 0, 0, 0 };
1116
1117 if (dirp == 0) {
1118 errno = ENOMEM;
1119 return 0;
1120 }
1121
1122 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1123 // as a directory in FindFirstFile(). We detect this case here and
1124 // prepend the current drive name.
1125 //
1126 if (dirname[1] == '\0' && dirname[0] == '\\') {
1127 alt_dirname[0] = _getdrive() + 'A' - 1;
1128 alt_dirname[1] = ':';
1129 alt_dirname[2] = '\\';
1130 alt_dirname[3] = '\0';
1131 dirname = alt_dirname;
1132 }
1133
1134 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1135 if (dirp->path == 0) {
1136 free(dirp);
1137 errno = ENOMEM;
1138 return 0;
1139 }
1140 strcpy(dirp->path, dirname);
1141
1142 fattr = GetFileAttributes(dirp->path);
1143 if (fattr == 0xffffffff) {
1144 free(dirp->path);
1145 free(dirp);
1146 errno = ENOENT;
1147 return 0;
1148 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1149 free(dirp->path);
1150 free(dirp);
1151 errno = ENOTDIR;
1152 return 0;
1153 }
1154
1155 // Append "*.*", or possibly "\\*.*", to path
1156 if (dirp->path[1] == ':' &&
1157 (dirp->path[2] == '\0' ||
1158 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1159 // No '\\' needed for cases like "Z:" or "Z:\"
1160 strcat(dirp->path, "*.*");
1161 } else {
1162 strcat(dirp->path, "\\*.*");
1163 }
1164
1165 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1166 if (dirp->handle == INVALID_HANDLE_VALUE) {
1167 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1168 free(dirp->path);
1169 free(dirp);
1170 errno = EACCES;
1171 return 0;
1172 }
1173 }
1174 return dirp;
1175 }
1176
1177 struct dirent * os::readdir(DIR *dirp) {
1178 assert(dirp != NULL, "just checking"); // hotspot change
1179 if (dirp->handle == INVALID_HANDLE_VALUE) {
1180 return NULL;
1181 }
1182
1183 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1184
1185 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1186 if (GetLastError() == ERROR_INVALID_HANDLE) {
1187 errno = EBADF;
1188 return NULL;
1189 }
1190 FindClose(dirp->handle);
1191 dirp->handle = INVALID_HANDLE_VALUE;
1192 }
1193
1194 return &dirp->dirent;
1195 }
1196
1197 int os::closedir(DIR *dirp) {
1198 assert(dirp != NULL, "just checking"); // hotspot change
1199 if (dirp->handle != INVALID_HANDLE_VALUE) {
1200 if (!FindClose(dirp->handle)) {
1201 errno = EBADF;
1202 return -1;
1203 }
1204 dirp->handle = INVALID_HANDLE_VALUE;
1205 }
1206 free(dirp->path);
1207 free(dirp);
1208 return 0;
1209 }
1210
1211 // This must be hard coded because it's the system's temporary
1212 // directory not the java application's temp directory, ala java.io.tmpdir.
1213 const char* os::get_temp_directory() {
1214 static char path_buf[MAX_PATH];
1215 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1216 return path_buf;
1217 } else {
1218 path_buf[0] = '\0';
1219 return path_buf;
1220 }
1221 }
1222
1223 // Needs to be in os specific directory because windows requires another
1224 // header file <direct.h>
1225 const char* os::get_current_directory(char *buf, size_t buflen) {
1226 int n = static_cast<int>(buflen);
1227 if (buflen > INT_MAX) n = INT_MAX;
1228 return _getcwd(buf, n);
1229 }
1230
1231 //-----------------------------------------------------------
1232 // Helper functions for fatal error handler
1233 #ifdef _WIN64
1234 // Helper routine which returns true if address in
1235 // within the NTDLL address space.
1236 //
1237 static bool _addr_in_ntdll(address addr) {
1238 HMODULE hmod;
1239 MODULEINFO minfo;
1240
1241 hmod = GetModuleHandle("NTDLL.DLL");
1242 if (hmod == NULL) return false;
1243 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1244 &minfo, sizeof(MODULEINFO))) {
1245 return false;
1246 }
1247
1248 if ((addr >= minfo.lpBaseOfDll) &&
1249 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1250 return true;
1251 } else {
1252 return false;
1253 }
1254 }
1255 #endif
1256
1257 struct _modinfo {
1258 address addr;
1259 char* full_path; // point to a char buffer
1260 int buflen; // size of the buffer
1261 address base_addr;
1262 };
1263
1264 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1265 address top_address, void * param) {
1266 struct _modinfo *pmod = (struct _modinfo *)param;
1267 if (!pmod) return -1;
1268
1269 if (base_addr <= pmod->addr &&
1270 top_address > pmod->addr) {
1271 // if a buffer is provided, copy path name to the buffer
1272 if (pmod->full_path) {
1273 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1274 }
1275 pmod->base_addr = base_addr;
1276 return 1;
1277 }
1278 return 0;
1279 }
1280
1281 bool os::dll_address_to_library_name(address addr, char* buf,
1282 int buflen, int* offset) {
1283 // buf is not optional, but offset is optional
1284 assert(buf != NULL, "sanity check");
1285
1286 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1287 // return the full path to the DLL file, sometimes it returns path
1288 // to the corresponding PDB file (debug info); sometimes it only
1289 // returns partial path, which makes life painful.
1290
1291 struct _modinfo mi;
1292 mi.addr = addr;
1293 mi.full_path = buf;
1294 mi.buflen = buflen;
1295 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1296 // buf already contains path name
1297 if (offset) *offset = addr - mi.base_addr;
1298 return true;
1299 }
1300
1301 buf[0] = '\0';
1302 if (offset) *offset = -1;
1303 return false;
1304 }
1305
1306 bool os::dll_address_to_function_name(address addr, char *buf,
1307 int buflen, int *offset,
1308 bool demangle) {
1309 // buf is not optional, but offset is optional
1310 assert(buf != NULL, "sanity check");
1311
1312 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1313 return true;
1314 }
1315 if (offset != NULL) *offset = -1;
1316 buf[0] = '\0';
1317 return false;
1318 }
1319
1320 // save the start and end address of jvm.dll into param[0] and param[1]
1321 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1322 address top_address, void * param) {
1323 if (!param) return -1;
1324
1325 if (base_addr <= (address)_locate_jvm_dll &&
1326 top_address > (address)_locate_jvm_dll) {
1327 ((address*)param)[0] = base_addr;
1328 ((address*)param)[1] = top_address;
1329 return 1;
1330 }
1331 return 0;
1332 }
1333
1334 address vm_lib_location[2]; // start and end address of jvm.dll
1335
1336 // check if addr is inside jvm.dll
1337 bool os::address_is_in_vm(address addr) {
1338 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1339 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1340 assert(false, "Can't find jvm module.");
1341 return false;
1342 }
1343 }
1344
1345 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1346 }
1347
1348 // print module info; param is outputStream*
1349 static int _print_module(const char* fname, address base_address,
1350 address top_address, void* param) {
1351 if (!param) return -1;
1352
1353 outputStream* st = (outputStream*)param;
1354
1355 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1356 return 0;
1357 }
1358
1359 // Loads .dll/.so and
1360 // in case of error it checks if .dll/.so was built for the
1361 // same architecture as Hotspot is running on
1362 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1363 log_info(os)("attempting shared library load of %s", name);
1364
1365 void * result = LoadLibrary(name);
1366 if (result != NULL) {
1367 Events::log(NULL, "Loaded shared library %s", name);
1368 // Recalculate pdb search path if a DLL was loaded successfully.
1369 SymbolEngine::recalc_search_path();
1370 log_info(os)("shared library load of %s was successful", name);
1371 return result;
1372 }
1373 DWORD errcode = GetLastError();
1374 // Read system error message into ebuf
1375 // It may or may not be overwritten below (in the for loop and just above)
1376 lasterror(ebuf, (size_t) ebuflen);
1377 ebuf[ebuflen - 1] = '\0';
1378 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1379 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1380
1381 if (errcode == ERROR_MOD_NOT_FOUND) {
1382 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1383 ebuf[ebuflen - 1] = '\0';
1384 return NULL;
1385 }
1386
1387 // Parsing dll below
1388 // If we can read dll-info and find that dll was built
1389 // for an architecture other than Hotspot is running in
1390 // - then print to buffer "DLL was built for a different architecture"
1391 // else call os::lasterror to obtain system error message
1392 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1393 if (fd < 0) {
1394 return NULL;
1395 }
1396
1397 uint32_t signature_offset;
1398 uint16_t lib_arch = 0;
1399 bool failed_to_get_lib_arch =
1400 ( // Go to position 3c in the dll
1401 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1402 ||
1403 // Read location of signature
1404 (sizeof(signature_offset) !=
1405 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1406 ||
1407 // Go to COFF File Header in dll
1408 // that is located after "signature" (4 bytes long)
1409 (os::seek_to_file_offset(fd,
1410 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1411 ||
1412 // Read field that contains code of architecture
1413 // that dll was built for
1414 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1415 );
1416
1417 ::close(fd);
1418 if (failed_to_get_lib_arch) {
1419 // file i/o error - report os::lasterror(...) msg
1420 return NULL;
1421 }
1422
1423 typedef struct {
1424 uint16_t arch_code;
1425 char* arch_name;
1426 } arch_t;
1427
1428 static const arch_t arch_array[] = {
1429 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1430 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1431 };
1432 #if (defined _M_AMD64)
1433 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1434 #elif (defined _M_IX86)
1435 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1436 #else
1437 #error Method os::dll_load requires that one of following \
1438 is defined :_M_AMD64 or _M_IX86
1439 #endif
1440
1441
1442 // Obtain a string for printf operation
1443 // lib_arch_str shall contain string what platform this .dll was built for
1444 // running_arch_str shall string contain what platform Hotspot was built for
1445 char *running_arch_str = NULL, *lib_arch_str = NULL;
1446 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1447 if (lib_arch == arch_array[i].arch_code) {
1448 lib_arch_str = arch_array[i].arch_name;
1449 }
1450 if (running_arch == arch_array[i].arch_code) {
1451 running_arch_str = arch_array[i].arch_name;
1452 }
1453 }
1454
1455 assert(running_arch_str,
1456 "Didn't find running architecture code in arch_array");
1457
1458 // If the architecture is right
1459 // but some other error took place - report os::lasterror(...) msg
1460 if (lib_arch == running_arch) {
1461 return NULL;
1462 }
1463
1464 if (lib_arch_str != NULL) {
1465 ::_snprintf(ebuf, ebuflen - 1,
1466 "Can't load %s-bit .dll on a %s-bit platform",
1467 lib_arch_str, running_arch_str);
1468 } else {
1469 // don't know what architecture this dll was build for
1470 ::_snprintf(ebuf, ebuflen - 1,
1471 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1472 lib_arch, running_arch_str);
1473 }
1474
1475 return NULL;
1476 }
1477
1478 void os::print_dll_info(outputStream *st) {
1479 st->print_cr("Dynamic libraries:");
1480 get_loaded_modules_info(_print_module, (void *)st);
1481 }
1482
1483 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1484 HANDLE hProcess;
1485
1486 # define MAX_NUM_MODULES 128
1487 HMODULE modules[MAX_NUM_MODULES];
1488 static char filename[MAX_PATH];
1489 int result = 0;
1490
1491 int pid = os::current_process_id();
1492 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1493 FALSE, pid);
1494 if (hProcess == NULL) return 0;
1495
1496 DWORD size_needed;
1497 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1498 CloseHandle(hProcess);
1499 return 0;
1500 }
1501
1502 // number of modules that are currently loaded
1503 int num_modules = size_needed / sizeof(HMODULE);
1504
1505 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1506 // Get Full pathname:
1507 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1508 filename[0] = '\0';
1509 }
1510
1511 MODULEINFO modinfo;
1512 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1513 modinfo.lpBaseOfDll = NULL;
1514 modinfo.SizeOfImage = 0;
1515 }
1516
1517 // Invoke callback function
1518 result = callback(filename, (address)modinfo.lpBaseOfDll,
1519 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1520 if (result) break;
1521 }
1522
1523 CloseHandle(hProcess);
1524 return result;
1525 }
1526
1527 bool os::get_host_name(char* buf, size_t buflen) {
1528 DWORD size = (DWORD)buflen;
1529 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1530 }
1531
1532 void os::get_summary_os_info(char* buf, size_t buflen) {
1533 stringStream sst(buf, buflen);
1534 os::win32::print_windows_version(&sst);
1535 // chop off newline character
1536 char* nl = strchr(buf, '\n');
1537 if (nl != NULL) *nl = '\0';
1538 }
1539
1540 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1541 #if _MSC_VER >= 1900
1542 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1543 int result = ::vsnprintf(buf, len, fmt, args);
1544 // If an encoding error occurred (result < 0) then it's not clear
1545 // whether the buffer is NUL terminated, so ensure it is.
1546 if ((result < 0) && (len > 0)) {
1547 buf[len - 1] = '\0';
1548 }
1549 return result;
1550 #else
1551 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1552 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1553 // versions. However, when len == 0, avoid _vsnprintf too, and just
1554 // go straight to _vscprintf. The output is going to be truncated in
1555 // that case, except in the unusual case of empty output. More
1556 // importantly, the documentation for various versions of Visual Studio
1557 // are inconsistent about the behavior of _vsnprintf when len == 0,
1558 // including it possibly being an error.
1559 int result = -1;
1560 if (len > 0) {
1561 result = _vsnprintf(buf, len, fmt, args);
1562 // If output (including NUL terminator) is truncated, the buffer
1563 // won't be NUL terminated. Add the trailing NUL specified by C99.
1564 if ((result < 0) || ((size_t)result >= len)) {
1565 buf[len - 1] = '\0';
1566 }
1567 }
1568 if (result < 0) {
1569 result = _vscprintf(fmt, args);
1570 }
1571 return result;
1572 #endif // _MSC_VER dispatch
1573 }
1574
1575 static inline time_t get_mtime(const char* filename) {
1576 struct stat st;
1577 int ret = os::stat(filename, &st);
1578 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1579 return st.st_mtime;
1580 }
1581
1582 int os::compare_file_modified_times(const char* file1, const char* file2) {
1583 time_t t1 = get_mtime(file1);
1584 time_t t2 = get_mtime(file2);
1585 return t1 - t2;
1586 }
1587
1588 void os::print_os_info_brief(outputStream* st) {
1589 os::print_os_info(st);
1590 }
1591
1592 void os::win32::print_uptime_info(outputStream* st) {
1593 unsigned long long ticks = GetTickCount64();
1594 os::print_dhm(st, "OS uptime:", ticks/1000);
1595 }
1596
1597 void os::print_os_info(outputStream* st) {
1598 #ifdef ASSERT
1599 char buffer[1024];
1600 st->print("HostName: ");
1601 if (get_host_name(buffer, sizeof(buffer))) {
1602 st->print("%s ", buffer);
1603 } else {
1604 st->print("N/A ");
1605 }
1606 #endif
1607 st->print_cr("OS:");
1608 os::win32::print_windows_version(st);
1609
1610 os::win32::print_uptime_info(st);
1611
1612 #ifdef _LP64
1613 VM_Version::print_platform_virtualization_info(st);
1614 #endif
1615 }
1616
1617 void os::win32::print_windows_version(outputStream* st) {
1618 OSVERSIONINFOEX osvi;
1619 VS_FIXEDFILEINFO *file_info;
1620 TCHAR kernel32_path[MAX_PATH];
1621 UINT len, ret;
1622
1623 // Use the GetVersionEx information to see if we're on a server or
1624 // workstation edition of Windows. Starting with Windows 8.1 we can't
1625 // trust the OS version information returned by this API.
1626 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1627 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1628 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1629 st->print_cr("Call to GetVersionEx failed");
1630 return;
1631 }
1632 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1633
1634 // Get the full path to \Windows\System32\kernel32.dll and use that for
1635 // determining what version of Windows we're running on.
1636 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1637 ret = GetSystemDirectory(kernel32_path, len);
1638 if (ret == 0 || ret > len) {
1639 st->print_cr("Call to GetSystemDirectory failed");
1640 return;
1641 }
1642 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1643
1644 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1645 if (version_size == 0) {
1646 st->print_cr("Call to GetFileVersionInfoSize failed");
1647 return;
1648 }
1649
1650 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1651 if (version_info == NULL) {
1652 st->print_cr("Failed to allocate version_info");
1653 return;
1654 }
1655
1656 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1657 os::free(version_info);
1658 st->print_cr("Call to GetFileVersionInfo failed");
1659 return;
1660 }
1661
1662 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1663 os::free(version_info);
1664 st->print_cr("Call to VerQueryValue failed");
1665 return;
1666 }
1667
1668 int major_version = HIWORD(file_info->dwProductVersionMS);
1669 int minor_version = LOWORD(file_info->dwProductVersionMS);
1670 int build_number = HIWORD(file_info->dwProductVersionLS);
1671 int build_minor = LOWORD(file_info->dwProductVersionLS);
1672 int os_vers = major_version * 1000 + minor_version;
1673 os::free(version_info);
1674
1675 st->print(" Windows ");
1676 switch (os_vers) {
1677
1678 case 6000:
1679 if (is_workstation) {
1680 st->print("Vista");
1681 } else {
1682 st->print("Server 2008");
1683 }
1684 break;
1685
1686 case 6001:
1687 if (is_workstation) {
1688 st->print("7");
1689 } else {
1690 st->print("Server 2008 R2");
1691 }
1692 break;
1693
1694 case 6002:
1695 if (is_workstation) {
1696 st->print("8");
1697 } else {
1698 st->print("Server 2012");
1699 }
1700 break;
1701
1702 case 6003:
1703 if (is_workstation) {
1704 st->print("8.1");
1705 } else {
1706 st->print("Server 2012 R2");
1707 }
1708 break;
1709
1710 case 10000:
1711 if (is_workstation) {
1712 st->print("10");
1713 } else {
1714 // distinguish Windows Server 2016 and 2019 by build number
1715 // Windows server 2019 GA 10/2018 build number is 17763
1716 if (build_number > 17762) {
1717 st->print("Server 2019");
1718 } else {
1719 st->print("Server 2016");
1720 }
1721 }
1722 break;
1723
1724 default:
1725 // Unrecognized windows, print out its major and minor versions
1726 st->print("%d.%d", major_version, minor_version);
1727 break;
1728 }
1729
1730 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1731 // find out whether we are running on 64 bit processor or not
1732 SYSTEM_INFO si;
1733 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1734 GetNativeSystemInfo(&si);
1735 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1736 st->print(" , 64 bit");
1737 }
1738
1739 st->print(" Build %d", build_number);
1740 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1741 st->cr();
1742 }
1743
1744 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1745 // Nothing to do for now.
1746 }
1747
1748 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1749 HKEY key;
1750 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1751 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1752 if (status == ERROR_SUCCESS) {
1753 DWORD size = (DWORD)buflen;
1754 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1755 if (status != ERROR_SUCCESS) {
1756 strncpy(buf, "## __CPU__", buflen);
1757 }
1758 RegCloseKey(key);
1759 } else {
1760 // Put generic cpu info to return
1761 strncpy(buf, "## __CPU__", buflen);
1762 }
1763 }
1764
1765 void os::print_memory_info(outputStream* st) {
1766 st->print("Memory:");
1767 st->print(" %dk page", os::vm_page_size()>>10);
1768
1769 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1770 // value if total memory is larger than 4GB
1771 MEMORYSTATUSEX ms;
1772 ms.dwLength = sizeof(ms);
1773 int r1 = GlobalMemoryStatusEx(&ms);
1774
1775 if (r1 != 0) {
1776 st->print(", system-wide physical " INT64_FORMAT "M ",
1777 (int64_t) ms.ullTotalPhys >> 20);
1778 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1779
1780 st->print("TotalPageFile size " INT64_FORMAT "M ",
1781 (int64_t) ms.ullTotalPageFile >> 20);
1782 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1783 (int64_t) ms.ullAvailPageFile >> 20);
1784
1785 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1786 #if defined(_M_IX86)
1787 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1788 (int64_t) ms.ullTotalVirtual >> 20);
1789 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1790 #endif
1791 } else {
1792 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1793 }
1794
1795 // extended memory statistics for a process
1796 PROCESS_MEMORY_COUNTERS_EX pmex;
1797 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1798 pmex.cb = sizeof(pmex);
1799 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1800
1801 if (r2 != 0) {
1802 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1803 (int64_t) pmex.WorkingSetSize >> 20);
1804 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1805
1806 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1807 (int64_t) pmex.PrivateUsage >> 20);
1808 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1809 } else {
1810 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1811 }
1812
1813 st->cr();
1814 }
1815
1816 bool os::signal_sent_by_kill(const void* siginfo) {
1817 // TODO: Is this possible?
1818 return false;
1819 }
1820
1821 void os::print_siginfo(outputStream *st, const void* siginfo) {
1822 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1823 st->print("siginfo:");
1824
1825 char tmp[64];
1826 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1827 strcpy(tmp, "EXCEPTION_??");
1828 }
1829 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1830
1831 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1832 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1833 er->NumberParameters >= 2) {
1834 switch (er->ExceptionInformation[0]) {
1835 case 0: st->print(", reading address"); break;
1836 case 1: st->print(", writing address"); break;
1837 case 8: st->print(", data execution prevention violation at address"); break;
1838 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1839 er->ExceptionInformation[0]);
1840 }
1841 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1842 } else {
1843 int num = er->NumberParameters;
1844 if (num > 0) {
1845 st->print(", ExceptionInformation=");
1846 for (int i = 0; i < num; i++) {
1847 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1848 }
1849 }
1850 }
1851 st->cr();
1852 }
1853
1854 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1855 // TODO: Can we kill thread?
1856 return false;
1857 }
1858
1859 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1860 // do nothing
1861 }
1862
1863 static char saved_jvm_path[MAX_PATH] = {0};
1864
1865 // Find the full path to the current module, jvm.dll
1866 void os::jvm_path(char *buf, jint buflen) {
1867 // Error checking.
1868 if (buflen < MAX_PATH) {
1869 assert(false, "must use a large-enough buffer");
1870 buf[0] = '\0';
1871 return;
1872 }
1873 // Lazy resolve the path to current module.
1874 if (saved_jvm_path[0] != 0) {
1875 strcpy(buf, saved_jvm_path);
1876 return;
1877 }
1878
1879 buf[0] = '\0';
1880 if (Arguments::sun_java_launcher_is_altjvm()) {
1881 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1882 // for a JAVA_HOME environment variable and fix up the path so it
1883 // looks like jvm.dll is installed there (append a fake suffix
1884 // hotspot/jvm.dll).
1885 char* java_home_var = ::getenv("JAVA_HOME");
1886 if (java_home_var != NULL && java_home_var[0] != 0 &&
1887 strlen(java_home_var) < (size_t)buflen) {
1888 strncpy(buf, java_home_var, buflen);
1889
1890 // determine if this is a legacy image or modules image
1891 // modules image doesn't have "jre" subdirectory
1892 size_t len = strlen(buf);
1893 char* jrebin_p = buf + len;
1894 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1895 if (0 != _access(buf, 0)) {
1896 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1897 }
1898 len = strlen(buf);
1899 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1900 }
1901 }
1902
1903 if (buf[0] == '\0') {
1904 GetModuleFileName(vm_lib_handle, buf, buflen);
1905 }
1906 strncpy(saved_jvm_path, buf, MAX_PATH);
1907 saved_jvm_path[MAX_PATH - 1] = '\0';
1908 }
1909
1910
1911 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1912 #ifndef _WIN64
1913 st->print("_");
1914 #endif
1915 }
1916
1917
1918 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1919 #ifndef _WIN64
1920 st->print("@%d", args_size * sizeof(int));
1921 #endif
1922 }
1923
1924 // This method is a copy of JDK's sysGetLastErrorString
1925 // from src/windows/hpi/src/system_md.c
1926
1927 size_t os::lasterror(char* buf, size_t len) {
1928 DWORD errval;
1929
1930 if ((errval = GetLastError()) != 0) {
1931 // DOS error
1932 size_t n = (size_t)FormatMessage(
1933 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1934 NULL,
1935 errval,
1936 0,
1937 buf,
1938 (DWORD)len,
1939 NULL);
1940 if (n > 3) {
1941 // Drop final '.', CR, LF
1942 if (buf[n - 1] == '\n') n--;
1943 if (buf[n - 1] == '\r') n--;
1944 if (buf[n - 1] == '.') n--;
1945 buf[n] = '\0';
1946 }
1947 return n;
1948 }
1949
1950 if (errno != 0) {
1951 // C runtime error that has no corresponding DOS error code
1952 const char* s = os::strerror(errno);
1953 size_t n = strlen(s);
1954 if (n >= len) n = len - 1;
1955 strncpy(buf, s, n);
1956 buf[n] = '\0';
1957 return n;
1958 }
1959
1960 return 0;
1961 }
1962
1963 int os::get_last_error() {
1964 DWORD error = GetLastError();
1965 if (error == 0) {
1966 error = errno;
1967 }
1968 return (int)error;
1969 }
1970
1971 // sun.misc.Signal
1972 // NOTE that this is a workaround for an apparent kernel bug where if
1973 // a signal handler for SIGBREAK is installed then that signal handler
1974 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1975 // See bug 4416763.
1976 static void (*sigbreakHandler)(int) = NULL;
1977
1978 static void UserHandler(int sig, void *siginfo, void *context) {
1979 os::signal_notify(sig);
1980 // We need to reinstate the signal handler each time...
1981 os::signal(sig, (void*)UserHandler);
1982 }
1983
1984 void* os::user_handler() {
1985 return (void*) UserHandler;
1986 }
1987
1988 void* os::signal(int signal_number, void* handler) {
1989 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1990 void (*oldHandler)(int) = sigbreakHandler;
1991 sigbreakHandler = (void (*)(int)) handler;
1992 return (void*) oldHandler;
1993 } else {
1994 return (void*)::signal(signal_number, (void (*)(int))handler);
1995 }
1996 }
1997
1998 void os::signal_raise(int signal_number) {
1999 raise(signal_number);
2000 }
2001
2002 // The Win32 C runtime library maps all console control events other than ^C
2003 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2004 // logoff, and shutdown events. We therefore install our own console handler
2005 // that raises SIGTERM for the latter cases.
2006 //
2007 static BOOL WINAPI consoleHandler(DWORD event) {
2008 switch (event) {
2009 case CTRL_C_EVENT:
2010 if (VMError::is_error_reported()) {
2011 // Ctrl-C is pressed during error reporting, likely because the error
2012 // handler fails to abort. Let VM die immediately.
2013 os::die();
2014 }
2015
2016 os::signal_raise(SIGINT);
2017 return TRUE;
2018 break;
2019 case CTRL_BREAK_EVENT:
2020 if (sigbreakHandler != NULL) {
2021 (*sigbreakHandler)(SIGBREAK);
2022 }
2023 return TRUE;
2024 break;
2025 case CTRL_LOGOFF_EVENT: {
2026 // Don't terminate JVM if it is running in a non-interactive session,
2027 // such as a service process.
2028 USEROBJECTFLAGS flags;
2029 HANDLE handle = GetProcessWindowStation();
2030 if (handle != NULL &&
2031 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2032 sizeof(USEROBJECTFLAGS), NULL)) {
2033 // If it is a non-interactive session, let next handler to deal
2034 // with it.
2035 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2036 return FALSE;
2037 }
2038 }
2039 }
2040 case CTRL_CLOSE_EVENT:
2041 case CTRL_SHUTDOWN_EVENT:
2042 os::signal_raise(SIGTERM);
2043 return TRUE;
2044 break;
2045 default:
2046 break;
2047 }
2048 return FALSE;
2049 }
2050
2051 // The following code is moved from os.cpp for making this
2052 // code platform specific, which it is by its very nature.
2053
2054 // Return maximum OS signal used + 1 for internal use only
2055 // Used as exit signal for signal_thread
2056 int os::sigexitnum_pd() {
2057 return NSIG;
2058 }
2059
2060 // a counter for each possible signal value, including signal_thread exit signal
2061 static volatile jint pending_signals[NSIG+1] = { 0 };
2062 static Semaphore* sig_sem = NULL;
2063
2064 static void jdk_misc_signal_init() {
2065 // Initialize signal structures
2066 memset((void*)pending_signals, 0, sizeof(pending_signals));
2067
2068 // Initialize signal semaphore
2069 sig_sem = new Semaphore();
2070
2071 // Programs embedding the VM do not want it to attempt to receive
2072 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2073 // shutdown hooks mechanism introduced in 1.3. For example, when
2074 // the VM is run as part of a Windows NT service (i.e., a servlet
2075 // engine in a web server), the correct behavior is for any console
2076 // control handler to return FALSE, not TRUE, because the OS's
2077 // "final" handler for such events allows the process to continue if
2078 // it is a service (while terminating it if it is not a service).
2079 // To make this behavior uniform and the mechanism simpler, we
2080 // completely disable the VM's usage of these console events if -Xrs
2081 // (=ReduceSignalUsage) is specified. This means, for example, that
2082 // the CTRL-BREAK thread dump mechanism is also disabled in this
2083 // case. See bugs 4323062, 4345157, and related bugs.
2084
2085 // Add a CTRL-C handler
2086 SetConsoleCtrlHandler(consoleHandler, TRUE);
2087 }
2088
2089 void os::signal_notify(int sig) {
2090 if (sig_sem != NULL) {
2091 Atomic::inc(&pending_signals[sig]);
2092 sig_sem->signal();
2093 } else {
2094 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2095 // initialization isn't called.
2096 assert(ReduceSignalUsage, "signal semaphore should be created");
2097 }
2098 }
2099
2100 static int check_pending_signals() {
2101 while (true) {
2102 for (int i = 0; i < NSIG + 1; i++) {
2103 jint n = pending_signals[i];
2104 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
2105 return i;
2106 }
2107 }
2108 JavaThread *thread = JavaThread::current();
2109
2110 ThreadBlockInVM tbivm(thread);
2111
2112 bool threadIsSuspended;
2113 do {
2114 thread->set_suspend_equivalent();
2115 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2116 sig_sem->wait();
2117
2118 // were we externally suspended while we were waiting?
2119 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2120 if (threadIsSuspended) {
2121 // The semaphore has been incremented, but while we were waiting
2122 // another thread suspended us. We don't want to continue running
2123 // while suspended because that would surprise the thread that
2124 // suspended us.
2125 sig_sem->signal();
2126
2127 thread->java_suspend_self();
2128 }
2129 } while (threadIsSuspended);
2130 }
2131 }
2132
2133 int os::signal_wait() {
2134 return check_pending_signals();
2135 }
2136
2137 // Implicit OS exception handling
2138
2139 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2140 address handler) {
2141 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2142 // Save pc in thread
2143 #ifdef _M_AMD64
2144 // Do not blow up if no thread info available.
2145 if (thread) {
2146 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2147 }
2148 // Set pc to handler
2149 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2150 #else
2151 // Do not blow up if no thread info available.
2152 if (thread) {
2153 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2154 }
2155 // Set pc to handler
2156 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2157 #endif
2158
2159 // Continue the execution
2160 return EXCEPTION_CONTINUE_EXECUTION;
2161 }
2162
2163
2164 // Used for PostMortemDump
2165 extern "C" void safepoints();
2166 extern "C" void find(int x);
2167 extern "C" void events();
2168
2169 // According to Windows API documentation, an illegal instruction sequence should generate
2170 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2171 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2172 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2173
2174 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2175
2176 // From "Execution Protection in the Windows Operating System" draft 0.35
2177 // Once a system header becomes available, the "real" define should be
2178 // included or copied here.
2179 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2180
2181 // Windows Vista/2008 heap corruption check
2182 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2183
2184 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2185 // C++ compiler contain this error code. Because this is a compiler-generated
2186 // error, the code is not listed in the Win32 API header files.
2187 // The code is actually a cryptic mnemonic device, with the initial "E"
2188 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2189 // ASCII values of "msc".
2190
2191 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2192
2193 #define def_excpt(val) { #val, (val) }
2194
2195 static const struct { const char* name; uint number; } exceptlabels[] = {
2196 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2197 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2198 def_excpt(EXCEPTION_BREAKPOINT),
2199 def_excpt(EXCEPTION_SINGLE_STEP),
2200 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2201 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2202 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2203 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2204 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2205 def_excpt(EXCEPTION_FLT_OVERFLOW),
2206 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2207 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2208 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2209 def_excpt(EXCEPTION_INT_OVERFLOW),
2210 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2211 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2212 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2213 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2214 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2215 def_excpt(EXCEPTION_STACK_OVERFLOW),
2216 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2217 def_excpt(EXCEPTION_GUARD_PAGE),
2218 def_excpt(EXCEPTION_INVALID_HANDLE),
2219 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2220 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2221 };
2222
2223 #undef def_excpt
2224
2225 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2226 uint code = static_cast<uint>(exception_code);
2227 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2228 if (exceptlabels[i].number == code) {
2229 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2230 return buf;
2231 }
2232 }
2233
2234 return NULL;
2235 }
2236
2237 //-----------------------------------------------------------------------------
2238 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2239 // handle exception caused by idiv; should only happen for -MinInt/-1
2240 // (division by zero is handled explicitly)
2241 #ifdef _M_AMD64
2242 PCONTEXT ctx = exceptionInfo->ContextRecord;
2243 address pc = (address)ctx->Rip;
2244 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2245 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2246 if (pc[0] == 0xF7) {
2247 // set correct result values and continue after idiv instruction
2248 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2249 } else {
2250 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2251 }
2252 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2253 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2254 // idiv opcode (0xF7).
2255 ctx->Rdx = (DWORD)0; // remainder
2256 // Continue the execution
2257 #else
2258 PCONTEXT ctx = exceptionInfo->ContextRecord;
2259 address pc = (address)ctx->Eip;
2260 assert(pc[0] == 0xF7, "not an idiv opcode");
2261 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2262 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2263 // set correct result values and continue after idiv instruction
2264 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2265 ctx->Eax = (DWORD)min_jint; // result
2266 ctx->Edx = (DWORD)0; // remainder
2267 // Continue the execution
2268 #endif
2269 return EXCEPTION_CONTINUE_EXECUTION;
2270 }
2271
2272 //-----------------------------------------------------------------------------
2273 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2274 PCONTEXT ctx = exceptionInfo->ContextRecord;
2275 #ifndef _WIN64
2276 // handle exception caused by native method modifying control word
2277 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2278
2279 switch (exception_code) {
2280 case EXCEPTION_FLT_DENORMAL_OPERAND:
2281 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2282 case EXCEPTION_FLT_INEXACT_RESULT:
2283 case EXCEPTION_FLT_INVALID_OPERATION:
2284 case EXCEPTION_FLT_OVERFLOW:
2285 case EXCEPTION_FLT_STACK_CHECK:
2286 case EXCEPTION_FLT_UNDERFLOW:
2287 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2288 if (fp_control_word != ctx->FloatSave.ControlWord) {
2289 // Restore FPCW and mask out FLT exceptions
2290 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2291 // Mask out pending FLT exceptions
2292 ctx->FloatSave.StatusWord &= 0xffffff00;
2293 return EXCEPTION_CONTINUE_EXECUTION;
2294 }
2295 }
2296
2297 if (prev_uef_handler != NULL) {
2298 // We didn't handle this exception so pass it to the previous
2299 // UnhandledExceptionFilter.
2300 return (prev_uef_handler)(exceptionInfo);
2301 }
2302 #else // !_WIN64
2303 // On Windows, the mxcsr control bits are non-volatile across calls
2304 // See also CR 6192333
2305 //
2306 jint MxCsr = INITIAL_MXCSR;
2307 // we can't use StubRoutines::addr_mxcsr_std()
2308 // because in Win64 mxcsr is not saved there
2309 if (MxCsr != ctx->MxCsr) {
2310 ctx->MxCsr = MxCsr;
2311 return EXCEPTION_CONTINUE_EXECUTION;
2312 }
2313 #endif // !_WIN64
2314
2315 return EXCEPTION_CONTINUE_SEARCH;
2316 }
2317
2318 static inline void report_error(Thread* t, DWORD exception_code,
2319 address addr, void* siginfo, void* context) {
2320 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2321
2322 // If UseOsErrorReporting, this will return here and save the error file
2323 // somewhere where we can find it in the minidump.
2324 }
2325
2326 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2327 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2328 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2329 address addr = (address) exceptionRecord->ExceptionInformation[1];
2330 if (Interpreter::contains(pc)) {
2331 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2332 if (!fr->is_first_java_frame()) {
2333 // get_frame_at_stack_banging_point() is only called when we
2334 // have well defined stacks so java_sender() calls do not need
2335 // to assert safe_for_sender() first.
2336 *fr = fr->java_sender();
2337 }
2338 } else {
2339 // more complex code with compiled code
2340 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2341 CodeBlob* cb = CodeCache::find_blob(pc);
2342 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2343 // Not sure where the pc points to, fallback to default
2344 // stack overflow handling
2345 return false;
2346 } else {
2347 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2348 // in compiled code, the stack banging is performed just after the return pc
2349 // has been pushed on the stack
2350 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2351 if (!fr->is_java_frame()) {
2352 // See java_sender() comment above.
2353 *fr = fr->java_sender();
2354 }
2355 }
2356 }
2357 assert(fr->is_java_frame(), "Safety check");
2358 return true;
2359 }
2360
2361 #if INCLUDE_AOT
2362 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2363 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2364 address addr = (address) exceptionRecord->ExceptionInformation[1];
2365 address pc = (address) exceptionInfo->ContextRecord->Rip;
2366
2367 // Handle the case where we get an implicit exception in AOT generated
2368 // code. AOT DLL's loaded are not registered for structured exceptions.
2369 // If the exception occurred in the codeCache or AOT code, pass control
2370 // to our normal exception handler.
2371 CodeBlob* cb = CodeCache::find_blob(pc);
2372 if (cb != NULL) {
2373 return topLevelExceptionFilter(exceptionInfo);
2374 }
2375
2376 return EXCEPTION_CONTINUE_SEARCH;
2377 }
2378 #endif
2379
2380 //-----------------------------------------------------------------------------
2381 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2382 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2383 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2384 #ifdef _M_AMD64
2385 address pc = (address) exceptionInfo->ContextRecord->Rip;
2386 #else
2387 address pc = (address) exceptionInfo->ContextRecord->Eip;
2388 #endif
2389 Thread* t = Thread::current_or_null_safe();
2390
2391 // Handle SafeFetch32 and SafeFetchN exceptions.
2392 if (StubRoutines::is_safefetch_fault(pc)) {
2393 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2394 }
2395
2396 #ifndef _WIN64
2397 // Execution protection violation - win32 running on AMD64 only
2398 // Handled first to avoid misdiagnosis as a "normal" access violation;
2399 // This is safe to do because we have a new/unique ExceptionInformation
2400 // code for this condition.
2401 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2402 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2403 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2404 address addr = (address) exceptionRecord->ExceptionInformation[1];
2405
2406 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2407 int page_size = os::vm_page_size();
2408
2409 // Make sure the pc and the faulting address are sane.
2410 //
2411 // If an instruction spans a page boundary, and the page containing
2412 // the beginning of the instruction is executable but the following
2413 // page is not, the pc and the faulting address might be slightly
2414 // different - we still want to unguard the 2nd page in this case.
2415 //
2416 // 15 bytes seems to be a (very) safe value for max instruction size.
2417 bool pc_is_near_addr =
2418 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2419 bool instr_spans_page_boundary =
2420 (align_down((intptr_t) pc ^ (intptr_t) addr,
2421 (intptr_t) page_size) > 0);
2422
2423 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2424 static volatile address last_addr =
2425 (address) os::non_memory_address_word();
2426
2427 // In conservative mode, don't unguard unless the address is in the VM
2428 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2429 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2430
2431 // Set memory to RWX and retry
2432 address page_start = align_down(addr, page_size);
2433 bool res = os::protect_memory((char*) page_start, page_size,
2434 os::MEM_PROT_RWX);
2435
2436 log_debug(os)("Execution protection violation "
2437 "at " INTPTR_FORMAT
2438 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2439 p2i(page_start), (res ? "success" : os::strerror(errno)));
2440
2441 // Set last_addr so if we fault again at the same address, we don't
2442 // end up in an endless loop.
2443 //
2444 // There are two potential complications here. Two threads trapping
2445 // at the same address at the same time could cause one of the
2446 // threads to think it already unguarded, and abort the VM. Likely
2447 // very rare.
2448 //
2449 // The other race involves two threads alternately trapping at
2450 // different addresses and failing to unguard the page, resulting in
2451 // an endless loop. This condition is probably even more unlikely
2452 // than the first.
2453 //
2454 // Although both cases could be avoided by using locks or thread
2455 // local last_addr, these solutions are unnecessary complication:
2456 // this handler is a best-effort safety net, not a complete solution.
2457 // It is disabled by default and should only be used as a workaround
2458 // in case we missed any no-execute-unsafe VM code.
2459
2460 last_addr = addr;
2461
2462 return EXCEPTION_CONTINUE_EXECUTION;
2463 }
2464 }
2465
2466 // Last unguard failed or not unguarding
2467 tty->print_raw_cr("Execution protection violation");
2468 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2469 exceptionInfo->ContextRecord);
2470 return EXCEPTION_CONTINUE_SEARCH;
2471 }
2472 }
2473 #endif // _WIN64
2474
2475 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2476 VM_Version::is_cpuinfo_segv_addr(pc)) {
2477 // Verify that OS save/restore AVX registers.
2478 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2479 }
2480
2481 if (t != NULL && t->is_Java_thread()) {
2482 JavaThread* thread = (JavaThread*) t;
2483 bool in_java = thread->thread_state() == _thread_in_Java;
2484
2485 // Handle potential stack overflows up front.
2486 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2487 if (thread->stack_guards_enabled()) {
2488 if (in_java) {
2489 frame fr;
2490 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2491 address addr = (address) exceptionRecord->ExceptionInformation[1];
2492 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2493 assert(fr.is_java_frame(), "Must be a Java frame");
2494 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2495 }
2496 }
2497 // Yellow zone violation. The o/s has unprotected the first yellow
2498 // zone page for us. Note: must call disable_stack_yellow_zone to
2499 // update the enabled status, even if the zone contains only one page.
2500 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2501 thread->disable_stack_yellow_reserved_zone();
2502 // If not in java code, return and hope for the best.
2503 return in_java
2504 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2505 : EXCEPTION_CONTINUE_EXECUTION;
2506 } else {
2507 // Fatal red zone violation.
2508 thread->disable_stack_red_zone();
2509 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2510 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2511 exceptionInfo->ContextRecord);
2512 return EXCEPTION_CONTINUE_SEARCH;
2513 }
2514 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2515 // Either stack overflow or null pointer exception.
2516 if (in_java) {
2517 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2518 address addr = (address) exceptionRecord->ExceptionInformation[1];
2519 address stack_end = thread->stack_end();
2520 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2521 // Stack overflow.
2522 assert(!os::uses_stack_guard_pages(),
2523 "should be caught by red zone code above.");
2524 return Handle_Exception(exceptionInfo,
2525 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2526 }
2527 // Check for safepoint polling and implicit null
2528 // We only expect null pointers in the stubs (vtable)
2529 // the rest are checked explicitly now.
2530 CodeBlob* cb = CodeCache::find_blob(pc);
2531 if (cb != NULL) {
2532 if (SafepointMechanism::is_poll_address(addr)) {
2533 address stub = SharedRuntime::get_poll_stub(pc);
2534 return Handle_Exception(exceptionInfo, stub);
2535 }
2536 }
2537 {
2538 #ifdef _WIN64
2539 // If it's a legal stack address map the entire region in
2540 //
2541 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2542 address addr = (address) exceptionRecord->ExceptionInformation[1];
2543 if (thread->is_in_usable_stack(addr)) {
2544 addr = (address)((uintptr_t)addr &
2545 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2546 os::commit_memory((char *)addr, thread->stack_base() - addr,
2547 !ExecMem);
2548 return EXCEPTION_CONTINUE_EXECUTION;
2549 } else
2550 #endif
2551 {
2552 // Null pointer exception.
2553 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2554 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2555 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2556 }
2557 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2558 exceptionInfo->ContextRecord);
2559 return EXCEPTION_CONTINUE_SEARCH;
2560 }
2561 }
2562 }
2563
2564 #ifdef _WIN64
2565 // Special care for fast JNI field accessors.
2566 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2567 // in and the heap gets shrunk before the field access.
2568 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2569 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2570 if (addr != (address)-1) {
2571 return Handle_Exception(exceptionInfo, addr);
2572 }
2573 }
2574 #endif
2575
2576 // Stack overflow or null pointer exception in native code.
2577 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2578 exceptionInfo->ContextRecord);
2579 return EXCEPTION_CONTINUE_SEARCH;
2580 } // /EXCEPTION_ACCESS_VIOLATION
2581 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2582
2583 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2584 CompiledMethod* nm = NULL;
2585 JavaThread* thread = (JavaThread*)t;
2586 if (in_java) {
2587 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2588 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2589 }
2590
2591 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2592 if (((thread->thread_state() == _thread_in_vm ||
2593 thread->thread_state() == _thread_in_native ||
2594 is_unsafe_arraycopy) &&
2595 thread->doing_unsafe_access()) ||
2596 (nm != NULL && nm->has_unsafe_access())) {
2597 address next_pc = Assembler::locate_next_instruction(pc);
2598 if (is_unsafe_arraycopy) {
2599 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2600 }
2601 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2602 }
2603 }
2604
2605 if (in_java) {
2606 switch (exception_code) {
2607 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2608 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2609
2610 case EXCEPTION_INT_OVERFLOW:
2611 return Handle_IDiv_Exception(exceptionInfo);
2612
2613 } // switch
2614 }
2615 if (((thread->thread_state() == _thread_in_Java) ||
2616 (thread->thread_state() == _thread_in_native)) &&
2617 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2618 LONG result=Handle_FLT_Exception(exceptionInfo);
2619 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2620 }
2621 }
2622
2623 if (exception_code != EXCEPTION_BREAKPOINT) {
2624 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2625 exceptionInfo->ContextRecord);
2626 }
2627 return EXCEPTION_CONTINUE_SEARCH;
2628 }
2629
2630 #ifndef _WIN64
2631 // Special care for fast JNI accessors.
2632 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2633 // the heap gets shrunk before the field access.
2634 // Need to install our own structured exception handler since native code may
2635 // install its own.
2636 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2637 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2638 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2639 address pc = (address) exceptionInfo->ContextRecord->Eip;
2640 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2641 if (addr != (address)-1) {
2642 return Handle_Exception(exceptionInfo, addr);
2643 }
2644 }
2645 return EXCEPTION_CONTINUE_SEARCH;
2646 }
2647
2648 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2649 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2650 jobject obj, \
2651 jfieldID fieldID) { \
2652 __try { \
2653 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2654 obj, \
2655 fieldID); \
2656 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2657 _exception_info())) { \
2658 } \
2659 return 0; \
2660 }
2661
2662 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2663 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2664 DEFINE_FAST_GETFIELD(jchar, char, Char)
2665 DEFINE_FAST_GETFIELD(jshort, short, Short)
2666 DEFINE_FAST_GETFIELD(jint, int, Int)
2667 DEFINE_FAST_GETFIELD(jlong, long, Long)
2668 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2669 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2670
2671 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2672 switch (type) {
2673 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2674 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2675 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2676 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2677 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2678 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2679 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2680 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2681 default: ShouldNotReachHere();
2682 }
2683 return (address)-1;
2684 }
2685 #endif
2686
2687 // Virtual Memory
2688
2689 int os::vm_page_size() { return os::win32::vm_page_size(); }
2690 int os::vm_allocation_granularity() {
2691 return os::win32::vm_allocation_granularity();
2692 }
2693
2694 // Windows large page support is available on Windows 2003. In order to use
2695 // large page memory, the administrator must first assign additional privilege
2696 // to the user:
2697 // + select Control Panel -> Administrative Tools -> Local Security Policy
2698 // + select Local Policies -> User Rights Assignment
2699 // + double click "Lock pages in memory", add users and/or groups
2700 // + reboot
2701 // Note the above steps are needed for administrator as well, as administrators
2702 // by default do not have the privilege to lock pages in memory.
2703 //
2704 // Note about Windows 2003: although the API supports committing large page
2705 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2706 // scenario, I found through experiment it only uses large page if the entire
2707 // memory region is reserved and committed in a single VirtualAlloc() call.
2708 // This makes Windows large page support more or less like Solaris ISM, in
2709 // that the entire heap must be committed upfront. This probably will change
2710 // in the future, if so the code below needs to be revisited.
2711
2712 #ifndef MEM_LARGE_PAGES
2713 #define MEM_LARGE_PAGES 0x20000000
2714 #endif
2715
2716 #define VirtualFreeChecked(mem, size, type) \
2717 do { \
2718 bool ret = VirtualFree(mem, size, type); \
2719 assert(ret, "Failed to free memory: " PTR_FORMAT, p2i(mem)); \
2720 } while (false)
2721
2722 // The number of bytes is setup to match 1 pixel and 32 bits per pixel.
2723 static const int gdi_tiny_bitmap_width_bytes = 4;
2724
2725 static HBITMAP gdi_create_tiny_bitmap(void* mem) {
2726 // The documentation for CreateBitmap states a word-alignment requirement.
2727 STATIC_ASSERT(is_aligned_(gdi_tiny_bitmap_width_bytes, sizeof(WORD)));
2728
2729 // Some callers use this function to test if memory crossing separate memory
2730 // reservations can be used. Create a height of 2 to make sure that one pixel
2731 // ends up in the first reservation and the other in the second.
2732 int nHeight = 2;
2733
2734 assert(is_aligned(mem, gdi_tiny_bitmap_width_bytes), "Incorrect alignment");
2735
2736 // Width is one pixel and correlates with gdi_tiny_bitmap_width_bytes.
2737 int nWidth = 1;
2738
2739 // Calculate bit count - will be 32.
2740 UINT nBitCount = gdi_tiny_bitmap_width_bytes / nWidth * BitsPerByte;
2741
2742 return CreateBitmap(
2743 nWidth,
2744 nHeight,
2745 1, // nPlanes
2746 nBitCount,
2747 mem); // lpBits
2748 }
2749
2750 // It has been found that some of the GDI functions fail under these two situations:
2751 // 1) When used with large pages
2752 // 2) When mem crosses the boundary between two separate memory reservations.
2753 //
2754 // This is a small test used to see if the current GDI implementation is
2755 // susceptible to any of these problems.
2756 static bool gdi_can_use_memory(void* mem) {
2757 HBITMAP bitmap = gdi_create_tiny_bitmap(mem);
2758 if (bitmap != NULL) {
2759 DeleteObject(bitmap);
2760 return true;
2761 }
2762
2763 // Verify that the bitmap could be created with a normal page.
2764 // If this fails, the testing method above isn't reliable.
2765 #ifdef ASSERT
2766 void* verify_mem = ::malloc(4 * 1024);
2767 HBITMAP verify_bitmap = gdi_create_tiny_bitmap(verify_mem);
2768 if (verify_bitmap == NULL) {
2769 fatal("Couldn't create test bitmap with malloced memory");
2770 } else {
2771 DeleteObject(verify_bitmap);
2772 }
2773 ::free(verify_mem);
2774 #endif
2775
2776 return false;
2777 }
2778
2779 // Test if GDI functions work when memory spans
2780 // two adjacent memory reservations.
2781 static bool gdi_can_use_split_reservation_memory(bool use_large_pages, size_t granule) {
2782 DWORD mem_large_pages = use_large_pages ? MEM_LARGE_PAGES : 0;
2783
2784 // Find virtual memory range. Two granules for regions and one for alignment.
2785 void* reserved = VirtualAlloc(NULL,
2786 granule * 3,
2787 MEM_RESERVE,
2788 PAGE_NOACCESS);
2789 if (reserved == NULL) {
2790 // Can't proceed with test - pessimistically report false
2791 return false;
2792 }
2793 VirtualFreeChecked(reserved, 0, MEM_RELEASE);
2794
2795 // Ensure proper alignment
2796 void* res0 = align_up(reserved, granule);
2797 void* res1 = (char*)res0 + granule;
2798
2799 // Reserve and commit the first part
2800 void* mem0 = VirtualAlloc(res0,
2801 granule,
2802 MEM_RESERVE|MEM_COMMIT|mem_large_pages,
2803 PAGE_READWRITE);
2804 if (mem0 != res0) {
2805 // Can't proceed with test - pessimistically report false
2806 return false;
2807 }
2808
2809 // Reserve and commit the second part
2810 void* mem1 = VirtualAlloc(res1,
2811 granule,
2812 MEM_RESERVE|MEM_COMMIT|mem_large_pages,
2813 PAGE_READWRITE);
2814 if (mem1 != res1) {
2815 VirtualFreeChecked(mem0, 0, MEM_RELEASE);
2816 // Can't proceed with test - pessimistically report false
2817 return false;
2818 }
2819
2820 // Set the bitmap's bits to point one "width" bytes before, so that
2821 // the bitmap extends across the reservation boundary.
2822 void* bitmapBits = (char*)mem1 - gdi_tiny_bitmap_width_bytes;
2823
2824 bool success = gdi_can_use_memory(bitmapBits);
2825
2826 VirtualFreeChecked(mem1, 0, MEM_RELEASE);
2827 VirtualFreeChecked(mem0, 0, MEM_RELEASE);
2828
2829 return success;
2830 }
2831
2832 // Container for NUMA node list info
2833 class NUMANodeListHolder {
2834 private:
2835 int *_numa_used_node_list; // allocated below
2836 int _numa_used_node_count;
2837
2838 void free_node_list() {
2839 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2840 }
2841
2842 public:
2843 NUMANodeListHolder() {
2844 _numa_used_node_count = 0;
2845 _numa_used_node_list = NULL;
2846 // do rest of initialization in build routine (after function pointers are set up)
2847 }
2848
2849 ~NUMANodeListHolder() {
2850 free_node_list();
2851 }
2852
2853 bool build() {
2854 DWORD_PTR proc_aff_mask;
2855 DWORD_PTR sys_aff_mask;
2856 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2857 ULONG highest_node_number;
2858 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2859 free_node_list();
2860 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2861 for (unsigned int i = 0; i <= highest_node_number; i++) {
2862 ULONGLONG proc_mask_numa_node;
2863 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2864 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2865 _numa_used_node_list[_numa_used_node_count++] = i;
2866 }
2867 }
2868 return (_numa_used_node_count > 1);
2869 }
2870
2871 int get_count() { return _numa_used_node_count; }
2872 int get_node_list_entry(int n) {
2873 // for indexes out of range, returns -1
2874 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2875 }
2876
2877 } numa_node_list_holder;
2878
2879 static size_t _large_page_size = 0;
2880
2881 static bool request_lock_memory_privilege() {
2882 HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2883 os::current_process_id());
2884
2885 bool success = false;
2886 HANDLE hToken = NULL;
2887 LUID luid;
2888 if (hProcess != NULL &&
2889 OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &hToken) &&
2890 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2891
2892 TOKEN_PRIVILEGES tp;
2893 tp.PrivilegeCount = 1;
2894 tp.Privileges[0].Luid = luid;
2895 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2896
2897 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2898 // privilege. Check GetLastError() too. See MSDN document.
2899 if (AdjustTokenPrivileges(hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2900 (GetLastError() == ERROR_SUCCESS)) {
2901 success = true;
2902 }
2903 }
2904
2905 // Cleanup
2906 if (hProcess != NULL) {
2907 CloseHandle(hProcess);
2908 }
2909 if (hToken != NULL) {
2910 CloseHandle(hToken);
2911 }
2912
2913 return success;
2914 }
2915
2916 static bool numa_interleaving_init() {
2917 bool success = false;
2918
2919 // print a warning if UseNUMAInterleaving flag is specified on command line
2920 bool warn_on_failure = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2921
2922 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2923
2924 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2925 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2926 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2927
2928 if (!numa_node_list_holder.build()) {
2929 WARN("Process does not cover multiple NUMA nodes.");
2930 WARN("...Ignoring UseNUMAInterleaving flag.");
2931 return false;
2932 }
2933
2934 if (!gdi_can_use_split_reservation_memory(UseLargePages, min_interleave_granularity)) {
2935 WARN("Windows GDI cannot handle split reservations.");
2936 WARN("...Ignoring UseNUMAInterleaving flag.");
2937 return false;
2938 }
2939
2940 if (log_is_enabled(Debug, os, cpu)) {
2941 Log(os, cpu) log;
2942 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2943 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2944 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2945 }
2946 }
2947
2948 #undef WARN
2949
2950 return true;
2951 }
2952
2953 // this routine is used whenever we need to reserve a contiguous VA range
2954 // but we need to make separate VirtualAlloc calls for each piece of the range
2955 // Reasons for doing this:
2956 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2957 // * UseNUMAInterleaving requires a separate node for each piece
2958 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2959 DWORD prot,
2960 bool should_inject_error = false) {
2961 char * p_buf;
2962 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2963 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2964 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2965
2966 // first reserve enough address space in advance since we want to be
2967 // able to break a single contiguous virtual address range into multiple
2968 // large page commits but WS2003 does not allow reserving large page space
2969 // so we just use 4K pages for reserve, this gives us a legal contiguous
2970 // address space. then we will deallocate that reservation, and re alloc
2971 // using large pages
2972 const size_t size_of_reserve = bytes + chunk_size;
2973 if (bytes > size_of_reserve) {
2974 // Overflowed.
2975 return NULL;
2976 }
2977 p_buf = (char *) VirtualAlloc(addr,
2978 size_of_reserve, // size of Reserve
2979 MEM_RESERVE,
2980 PAGE_READWRITE);
2981 // If reservation failed, return NULL
2982 if (p_buf == NULL) return NULL;
2983 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2984 os::release_memory(p_buf, bytes + chunk_size);
2985
2986 // we still need to round up to a page boundary (in case we are using large pages)
2987 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2988 // instead we handle this in the bytes_to_rq computation below
2989 p_buf = align_up(p_buf, page_size);
2990
2991 // now go through and allocate one chunk at a time until all bytes are
2992 // allocated
2993 size_t bytes_remaining = bytes;
2994 // An overflow of align_up() would have been caught above
2995 // in the calculation of size_of_reserve.
2996 char * next_alloc_addr = p_buf;
2997 HANDLE hProc = GetCurrentProcess();
2998
2999 #ifdef ASSERT
3000 // Variable for the failure injection
3001 int ran_num = os::random();
3002 size_t fail_after = ran_num % bytes;
3003 #endif
3004
3005 int count=0;
3006 while (bytes_remaining) {
3007 // select bytes_to_rq to get to the next chunk_size boundary
3008
3009 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3010 // Note allocate and commit
3011 char * p_new;
3012
3013 #ifdef ASSERT
3014 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3015 #else
3016 const bool inject_error_now = false;
3017 #endif
3018
3019 if (inject_error_now) {
3020 p_new = NULL;
3021 } else {
3022 if (!UseNUMAInterleaving) {
3023 p_new = (char *) VirtualAlloc(next_alloc_addr,
3024 bytes_to_rq,
3025 flags,
3026 prot);
3027 } else {
3028 // get the next node to use from the used_node_list
3029 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3030 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3031 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3032 }
3033 }
3034
3035 if (p_new == NULL) {
3036 // Free any allocated pages
3037 if (next_alloc_addr > p_buf) {
3038 // Some memory was committed so release it.
3039 size_t bytes_to_release = bytes - bytes_remaining;
3040 // NMT has yet to record any individual blocks, so it
3041 // need to create a dummy 'reserve' record to match
3042 // the release.
3043 MemTracker::record_virtual_memory_reserve((address)p_buf,
3044 bytes_to_release, CALLER_PC);
3045 os::release_memory(p_buf, bytes_to_release);
3046 }
3047 #ifdef ASSERT
3048 if (should_inject_error) {
3049 log_develop_debug(pagesize)("Reserving pages individually failed.");
3050 }
3051 #endif
3052 return NULL;
3053 }
3054
3055 bytes_remaining -= bytes_to_rq;
3056 next_alloc_addr += bytes_to_rq;
3057 count++;
3058 }
3059 // Although the memory is allocated individually, it is returned as one.
3060 // NMT records it as one block.
3061 if ((flags & MEM_COMMIT) != 0) {
3062 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3063 } else {
3064 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3065 }
3066
3067 // made it this far, success
3068 return p_buf;
3069 }
3070
3071 static size_t large_page_init_decide_size() {
3072 // print a warning if any large page related flag is specified on command line
3073 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3074 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3075
3076 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3077
3078 if (!request_lock_memory_privilege()) {
3079 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3080 return 0;
3081 }
3082
3083 size_t size = GetLargePageMinimum();
3084 if (size == 0) {
3085 WARN("Large page is not supported by the processor.");
3086 return 0;
3087 }
3088
3089 #if defined(IA32) || defined(AMD64)
3090 if (size > 4*M || LargePageSizeInBytes > 4*M) {
3091 WARN("JVM cannot use large pages bigger than 4mb.");
3092 return 0;
3093 }
3094 #endif
3095
3096 if (LargePageSizeInBytes > 0 && LargePageSizeInBytes % size == 0) {
3097 size = LargePageSizeInBytes;
3098 }
3099
3100 // Now test allocating a page
3101 void* large_page = VirtualAlloc(NULL,
3102 size,
3103 MEM_RESERVE|MEM_COMMIT|MEM_LARGE_PAGES,
3104 PAGE_READWRITE);
3105 if (large_page == NULL) {
3106 WARN("JVM cannot allocate one single large page.");
3107 return 0;
3108 }
3109
3110 // Detect if GDI can use memory backed by large pages
3111 if (!gdi_can_use_memory(large_page)) {
3112 WARN("JVM cannot use large pages because of bug in Windows GDI.");
3113 return 0;
3114 }
3115
3116 // Release test page
3117 VirtualFreeChecked(large_page, 0, MEM_RELEASE);
3118
3119 #undef WARN
3120
3121 return size;
3122 }
3123
3124 void os::large_page_init() {
3125 if (!UseLargePages) {
3126 return;
3127 }
3128
3129 _large_page_size = large_page_init_decide_size();
3130
3131 const size_t default_page_size = (size_t) vm_page_size();
3132 if (_large_page_size > default_page_size) {
3133 _page_sizes[0] = _large_page_size;
3134 _page_sizes[1] = default_page_size;
3135 _page_sizes[2] = 0;
3136 }
3137
3138 UseLargePages = _large_page_size != 0;
3139
3140 if (UseLargePages && UseLargePagesIndividualAllocation) {
3141 if (!gdi_can_use_split_reservation_memory(true /* use_large_pages */, _large_page_size)) {
3142 if (FLAG_IS_CMDLINE(UseLargePagesIndividualAllocation)) {
3143 warning("Windows GDI cannot handle split reservations.");
3144 warning("...Ignoring UseLargePagesIndividualAllocation flag.");
3145 }
3146 UseLargePagesIndividualAllocation = false;
3147 }
3148 }
3149 }
3150
3151 int os::create_file_for_heap(const char* dir) {
3152
3153 const char name_template[] = "/jvmheap.XXXXXX";
3154
3155 size_t fullname_len = strlen(dir) + strlen(name_template);
3156 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3157 if (fullname == NULL) {
3158 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3159 return -1;
3160 }
3161 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3162 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3163
3164 os::native_path(fullname);
3165
3166 char *path = _mktemp(fullname);
3167 if (path == NULL) {
3168 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3169 os::free(fullname);
3170 return -1;
3171 }
3172
3173 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3174
3175 os::free(fullname);
3176 if (fd < 0) {
3177 warning("Problem opening file for heap (%s)", os::strerror(errno));
3178 return -1;
3179 }
3180 return fd;
3181 }
3182
3183 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3184 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3185 assert(fd != -1, "File descriptor is not valid");
3186
3187 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3188 #ifdef _LP64
3189 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3190 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3191 #else
3192 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3193 0, (DWORD)size, NULL);
3194 #endif
3195 if (fileMapping == NULL) {
3196 if (GetLastError() == ERROR_DISK_FULL) {
3197 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3198 }
3199 else {
3200 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3201 }
3202
3203 return NULL;
3204 }
3205
3206 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3207
3208 CloseHandle(fileMapping);
3209
3210 return (char*)addr;
3211 }
3212
3213 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3214 assert(fd != -1, "File descriptor is not valid");
3215 assert(base != NULL, "Base address cannot be NULL");
3216
3217 release_memory(base, size);
3218 return map_memory_to_file(base, size, fd);
3219 }
3220
3221 // On win32, one cannot release just a part of reserved memory, it's an
3222 // all or nothing deal. When we split a reservation, we must break the
3223 // reservation into two reservations.
3224 void os::split_reserved_memory(char *base, size_t size, size_t split) {
3225
3226 char* const split_address = base + split;
3227 assert(size > 0, "Sanity");
3228 assert(size > split, "Sanity");
3229 assert(split > 0, "Sanity");
3230 assert(is_aligned(base, os::vm_allocation_granularity()), "Sanity");
3231 assert(is_aligned(split_address, os::vm_allocation_granularity()), "Sanity");
3232
3233 release_memory(base, size);
3234 reserve_memory(split, base);
3235 reserve_memory(size - split, split_address);
3236
3237 // NMT: nothing to do here. Since Windows implements the split by
3238 // releasing and re-reserving memory, the parts are already registered
3239 // as individual mappings with NMT.
3240
3241 }
3242
3243 // Multiple threads can race in this code but it's not possible to unmap small sections of
3244 // virtual space to get requested alignment, like posix-like os's.
3245 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3246 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3247 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3248 "Alignment must be a multiple of allocation granularity (page size)");
3249 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3250
3251 size_t extra_size = size + alignment;
3252 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3253
3254 char* aligned_base = NULL;
3255
3256 do {
3257 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3258 if (extra_base == NULL) {
3259 return NULL;
3260 }
3261 // Do manual alignment
3262 aligned_base = align_up(extra_base, alignment);
3263
3264 if (file_desc != -1) {
3265 os::unmap_memory(extra_base, extra_size);
3266 } else {
3267 os::release_memory(extra_base, extra_size);
3268 }
3269
3270 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3271
3272 } while (aligned_base == NULL);
3273
3274 return aligned_base;
3275 }
3276
3277 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3278 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3279 "reserve alignment");
3280 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3281 char* res;
3282 // note that if UseLargePages is on, all the areas that require interleaving
3283 // will go thru reserve_memory_special rather than thru here.
3284 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3285 if (!use_individual) {
3286 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3287 } else {
3288 elapsedTimer reserveTimer;
3289 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3290 // in numa interleaving, we have to allocate pages individually
3291 // (well really chunks of NUMAInterleaveGranularity size)
3292 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3293 if (res == NULL) {
3294 warning("NUMA page allocation failed");
3295 }
3296 if (Verbose && PrintMiscellaneous) {
3297 reserveTimer.stop();
3298 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3299 reserveTimer.milliseconds(), reserveTimer.ticks());
3300 }
3301 }
3302 assert(res == NULL || addr == NULL || addr == res,
3303 "Unexpected address from reserve.");
3304
3305 return res;
3306 }
3307
3308 // Reserve memory at an arbitrary address, only if that area is
3309 // available (and not reserved for something else).
3310 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3311 // Windows os::reserve_memory() fails of the requested address range is
3312 // not avilable.
3313 return reserve_memory(bytes, requested_addr);
3314 }
3315
3316 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3317 assert(file_desc >= 0, "file_desc is not valid");
3318 return map_memory_to_file(requested_addr, bytes, file_desc);
3319 }
3320
3321 size_t os::large_page_size() {
3322 return _large_page_size;
3323 }
3324
3325 bool os::can_commit_large_page_memory() {
3326 // Windows only uses large page memory when the entire region is reserved
3327 // and committed in a single VirtualAlloc() call. This may change in the
3328 // future, but with Windows 2003 it's not possible to commit on demand.
3329 return false;
3330 }
3331
3332 bool os::can_execute_large_page_memory() {
3333 return true;
3334 }
3335
3336 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3337 bool exec) {
3338 assert(UseLargePages, "only for large pages");
3339
3340 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3341 return NULL; // Fallback to small pages.
3342 }
3343
3344 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3345 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3346
3347 // with large pages, there are two cases where we need to use Individual Allocation
3348 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3349 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3350 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3351 log_debug(pagesize)("Reserving large pages individually.");
3352
3353 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3354 if (p_buf == NULL) {
3355 // give an appropriate warning message
3356 if (UseNUMAInterleaving) {
3357 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3358 }
3359 if (UseLargePagesIndividualAllocation) {
3360 warning("Individually allocated large pages failed, "
3361 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3362 }
3363 return NULL;
3364 }
3365
3366 return p_buf;
3367
3368 } else {
3369 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3370
3371 // normal policy just allocate it all at once
3372 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3373 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3374
3375 return res;
3376 }
3377 }
3378
3379 bool os::pd_release_memory_special(char* base, size_t bytes) {
3380 assert(base != NULL, "Sanity check");
3381 return pd_release_memory(base, bytes);
3382 }
3383
3384 void os::print_statistics() {
3385 }
3386
3387 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3388 int err = os::get_last_error();
3389 char buf[256];
3390 size_t buf_len = os::lasterror(buf, sizeof(buf));
3391 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3392 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3393 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3394 }
3395
3396 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3397 if (bytes == 0) {
3398 // Don't bother the OS with noops.
3399 return true;
3400 }
3401 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3402 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3403 // Don't attempt to print anything if the OS call fails. We're
3404 // probably low on resources, so the print itself may cause crashes.
3405
3406 // unless we have NUMAInterleaving enabled, the range of a commit
3407 // is always within a reserve covered by a single VirtualAlloc
3408 // in that case we can just do a single commit for the requested size
3409 if (!UseNUMAInterleaving) {
3410 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3411 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3412 return false;
3413 }
3414 if (exec) {
3415 DWORD oldprot;
3416 // Windows doc says to use VirtualProtect to get execute permissions
3417 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3418 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3419 return false;
3420 }
3421 }
3422 return true;
3423 } else {
3424
3425 // when NUMAInterleaving is enabled, the commit might cover a range that
3426 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3427 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3428 // returns represents the number of bytes that can be committed in one step.
3429 size_t bytes_remaining = bytes;
3430 char * next_alloc_addr = addr;
3431 while (bytes_remaining > 0) {
3432 MEMORY_BASIC_INFORMATION alloc_info;
3433 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3434 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3435 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3436 PAGE_READWRITE) == NULL) {
3437 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3438 exec);)
3439 return false;
3440 }
3441 if (exec) {
3442 DWORD oldprot;
3443 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3444 PAGE_EXECUTE_READWRITE, &oldprot)) {
3445 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3446 exec);)
3447 return false;
3448 }
3449 }
3450 bytes_remaining -= bytes_to_rq;
3451 next_alloc_addr += bytes_to_rq;
3452 }
3453 }
3454 // if we made it this far, return true
3455 return true;
3456 }
3457
3458 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3459 bool exec) {
3460 // alignment_hint is ignored on this OS
3461 return pd_commit_memory(addr, size, exec);
3462 }
3463
3464 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3465 const char* mesg) {
3466 assert(mesg != NULL, "mesg must be specified");
3467 if (!pd_commit_memory(addr, size, exec)) {
3468 warn_fail_commit_memory(addr, size, exec);
3469 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3470 }
3471 }
3472
3473 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3474 size_t alignment_hint, bool exec,
3475 const char* mesg) {
3476 // alignment_hint is ignored on this OS
3477 pd_commit_memory_or_exit(addr, size, exec, mesg);
3478 }
3479
3480 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3481 if (bytes == 0) {
3482 // Don't bother the OS with noops.
3483 return true;
3484 }
3485 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3486 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3487 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3488 }
3489
3490 bool os::pd_release_memory(char* addr, size_t bytes) {
3491 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3492 }
3493
3494 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3495 return os::commit_memory(addr, size, !ExecMem);
3496 }
3497
3498 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3499 return os::uncommit_memory(addr, size);
3500 }
3501
3502 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3503 uint count = 0;
3504 bool ret = false;
3505 size_t bytes_remaining = bytes;
3506 char * next_protect_addr = addr;
3507
3508 // Use VirtualQuery() to get the chunk size.
3509 while (bytes_remaining) {
3510 MEMORY_BASIC_INFORMATION alloc_info;
3511 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3512 return false;
3513 }
3514
3515 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3516 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3517 // but we don't distinguish here as both cases are protected by same API.
3518 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3519 warning("Failed protecting pages individually for chunk #%u", count);
3520 if (!ret) {
3521 return false;
3522 }
3523
3524 bytes_remaining -= bytes_to_protect;
3525 next_protect_addr += bytes_to_protect;
3526 count++;
3527 }
3528 return ret;
3529 }
3530
3531 // Set protections specified
3532 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3533 bool is_committed) {
3534 unsigned int p = 0;
3535 switch (prot) {
3536 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3537 case MEM_PROT_READ: p = PAGE_READONLY; break;
3538 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3539 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3540 default:
3541 ShouldNotReachHere();
3542 }
3543
3544 DWORD old_status;
3545
3546 // Strange enough, but on Win32 one can change protection only for committed
3547 // memory, not a big deal anyway, as bytes less or equal than 64K
3548 if (!is_committed) {
3549 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3550 "cannot commit protection page");
3551 }
3552 // One cannot use os::guard_memory() here, as on Win32 guard page
3553 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3554 //
3555 // Pages in the region become guard pages. Any attempt to access a guard page
3556 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3557 // the guard page status. Guard pages thus act as a one-time access alarm.
3558 bool ret;
3559 if (UseNUMAInterleaving) {
3560 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3561 // so we must protect the chunks individually.
3562 ret = protect_pages_individually(addr, bytes, p, &old_status);
3563 } else {
3564 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3565 }
3566 #ifdef ASSERT
3567 if (!ret) {
3568 int err = os::get_last_error();
3569 char buf[256];
3570 size_t buf_len = os::lasterror(buf, sizeof(buf));
3571 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3572 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3573 buf_len != 0 ? buf : "<no_error_string>", err);
3574 }
3575 #endif
3576 return ret;
3577 }
3578
3579 bool os::guard_memory(char* addr, size_t bytes) {
3580 DWORD old_status;
3581 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3582 }
3583
3584 bool os::unguard_memory(char* addr, size_t bytes) {
3585 DWORD old_status;
3586 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3587 }
3588
3589 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3590 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3591 void os::numa_make_global(char *addr, size_t bytes) { }
3592 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3593 bool os::numa_topology_changed() { return false; }
3594 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3595 int os::numa_get_group_id() { return 0; }
3596 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3597 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3598 // Provide an answer for UMA systems
3599 ids[0] = 0;
3600 return 1;
3601 } else {
3602 // check for size bigger than actual groups_num
3603 size = MIN2(size, numa_get_groups_num());
3604 for (int i = 0; i < (int)size; i++) {
3605 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3606 }
3607 return size;
3608 }
3609 }
3610
3611 int os::numa_get_group_id_for_address(const void* address) {
3612 return 0;
3613 }
3614
3615 bool os::get_page_info(char *start, page_info* info) {
3616 return false;
3617 }
3618
3619 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3620 page_info* page_found) {
3621 return end;
3622 }
3623
3624 char* os::non_memory_address_word() {
3625 // Must never look like an address returned by reserve_memory,
3626 // even in its subfields (as defined by the CPU immediate fields,
3627 // if the CPU splits constants across multiple instructions).
3628 return (char*)-1;
3629 }
3630
3631 #define MAX_ERROR_COUNT 100
3632 #define SYS_THREAD_ERROR 0xffffffffUL
3633
3634 void os::pd_start_thread(Thread* thread) {
3635 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3636 // Returns previous suspend state:
3637 // 0: Thread was not suspended
3638 // 1: Thread is running now
3639 // >1: Thread is still suspended.
3640 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3641 }
3642
3643
3644 // Short sleep, direct OS call.
3645 //
3646 // ms = 0, means allow others (if any) to run.
3647 //
3648 void os::naked_short_sleep(jlong ms) {
3649 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3650 Sleep(ms);
3651 }
3652
3653 // Windows does not provide sleep functionality with nanosecond resolution, so we
3654 // try to approximate this with spinning combined with yielding if another thread
3655 // is ready to run on the current processor.
3656 void os::naked_short_nanosleep(jlong ns) {
3657 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3658
3659 int64_t start = os::javaTimeNanos();
3660 do {
3661 if (SwitchToThread() == 0) {
3662 // Nothing else is ready to run on this cpu, spin a little
3663 SpinPause();
3664 }
3665 } while (os::javaTimeNanos() - start < ns);
3666 }
3667
3668 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3669 void os::infinite_sleep() {
3670 while (true) { // sleep forever ...
3671 Sleep(100000); // ... 100 seconds at a time
3672 }
3673 }
3674
3675 typedef BOOL (WINAPI * STTSignature)(void);
3676
3677 void os::naked_yield() {
3678 // Consider passing back the return value from SwitchToThread().
3679 SwitchToThread();
3680 }
3681
3682 // Win32 only gives you access to seven real priorities at a time,
3683 // so we compress Java's ten down to seven. It would be better
3684 // if we dynamically adjusted relative priorities.
3685
3686 int os::java_to_os_priority[CriticalPriority + 1] = {
3687 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3688 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3689 THREAD_PRIORITY_LOWEST, // 2
3690 THREAD_PRIORITY_BELOW_NORMAL, // 3
3691 THREAD_PRIORITY_BELOW_NORMAL, // 4
3692 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3693 THREAD_PRIORITY_NORMAL, // 6
3694 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3695 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3696 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3697 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3698 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3699 };
3700
3701 int prio_policy1[CriticalPriority + 1] = {
3702 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3703 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3704 THREAD_PRIORITY_LOWEST, // 2
3705 THREAD_PRIORITY_BELOW_NORMAL, // 3
3706 THREAD_PRIORITY_BELOW_NORMAL, // 4
3707 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3708 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3709 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3710 THREAD_PRIORITY_HIGHEST, // 8
3711 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3712 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3713 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3714 };
3715
3716 static int prio_init() {
3717 // If ThreadPriorityPolicy is 1, switch tables
3718 if (ThreadPriorityPolicy == 1) {
3719 int i;
3720 for (i = 0; i < CriticalPriority + 1; i++) {
3721 os::java_to_os_priority[i] = prio_policy1[i];
3722 }
3723 }
3724 if (UseCriticalJavaThreadPriority) {
3725 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3726 }
3727 return 0;
3728 }
3729
3730 OSReturn os::set_native_priority(Thread* thread, int priority) {
3731 if (!UseThreadPriorities) return OS_OK;
3732 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3733 return ret ? OS_OK : OS_ERR;
3734 }
3735
3736 OSReturn os::get_native_priority(const Thread* const thread,
3737 int* priority_ptr) {
3738 if (!UseThreadPriorities) {
3739 *priority_ptr = java_to_os_priority[NormPriority];
3740 return OS_OK;
3741 }
3742 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3743 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3744 assert(false, "GetThreadPriority failed");
3745 return OS_ERR;
3746 }
3747 *priority_ptr = os_prio;
3748 return OS_OK;
3749 }
3750
3751 // GetCurrentThreadId() returns DWORD
3752 intx os::current_thread_id() { return GetCurrentThreadId(); }
3753
3754 static int _initial_pid = 0;
3755
3756 int os::current_process_id() {
3757 return (_initial_pid ? _initial_pid : _getpid());
3758 }
3759
3760 int os::win32::_vm_page_size = 0;
3761 int os::win32::_vm_allocation_granularity = 0;
3762 int os::win32::_processor_type = 0;
3763 // Processor level is not available on non-NT systems, use vm_version instead
3764 int os::win32::_processor_level = 0;
3765 julong os::win32::_physical_memory = 0;
3766 size_t os::win32::_default_stack_size = 0;
3767
3768 intx os::win32::_os_thread_limit = 0;
3769 volatile intx os::win32::_os_thread_count = 0;
3770
3771 bool os::win32::_is_windows_server = false;
3772
3773 // 6573254
3774 // Currently, the bug is observed across all the supported Windows releases,
3775 // including the latest one (as of this writing - Windows Server 2012 R2)
3776 bool os::win32::_has_exit_bug = true;
3777
3778 void os::win32::initialize_system_info() {
3779 SYSTEM_INFO si;
3780 GetSystemInfo(&si);
3781 _vm_page_size = si.dwPageSize;
3782 _vm_allocation_granularity = si.dwAllocationGranularity;
3783 _processor_type = si.dwProcessorType;
3784 _processor_level = si.wProcessorLevel;
3785 set_processor_count(si.dwNumberOfProcessors);
3786
3787 MEMORYSTATUSEX ms;
3788 ms.dwLength = sizeof(ms);
3789
3790 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3791 // dwMemoryLoad (% of memory in use)
3792 GlobalMemoryStatusEx(&ms);
3793 _physical_memory = ms.ullTotalPhys;
3794
3795 if (FLAG_IS_DEFAULT(MaxRAM)) {
3796 // Adjust MaxRAM according to the maximum virtual address space available.
3797 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3798 }
3799
3800 OSVERSIONINFOEX oi;
3801 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3802 GetVersionEx((OSVERSIONINFO*)&oi);
3803 switch (oi.dwPlatformId) {
3804 case VER_PLATFORM_WIN32_NT:
3805 {
3806 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3807 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3808 oi.wProductType == VER_NT_SERVER) {
3809 _is_windows_server = true;
3810 }
3811 }
3812 break;
3813 default: fatal("Unknown platform");
3814 }
3815
3816 _default_stack_size = os::current_stack_size();
3817 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3818 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3819 "stack size not a multiple of page size");
3820
3821 initialize_performance_counter();
3822 }
3823
3824
3825 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3826 int ebuflen) {
3827 char path[MAX_PATH];
3828 DWORD size;
3829 DWORD pathLen = (DWORD)sizeof(path);
3830 HINSTANCE result = NULL;
3831
3832 // only allow library name without path component
3833 assert(strchr(name, '\\') == NULL, "path not allowed");
3834 assert(strchr(name, ':') == NULL, "path not allowed");
3835 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3836 jio_snprintf(ebuf, ebuflen,
3837 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3838 return NULL;
3839 }
3840
3841 // search system directory
3842 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3843 if (size >= pathLen) {
3844 return NULL; // truncated
3845 }
3846 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3847 return NULL; // truncated
3848 }
3849 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3850 return result;
3851 }
3852 }
3853
3854 // try Windows directory
3855 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3856 if (size >= pathLen) {
3857 return NULL; // truncated
3858 }
3859 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3860 return NULL; // truncated
3861 }
3862 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3863 return result;
3864 }
3865 }
3866
3867 jio_snprintf(ebuf, ebuflen,
3868 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3869 return NULL;
3870 }
3871
3872 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3873 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3874
3875 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3876 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3877 return TRUE;
3878 }
3879
3880 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3881 // Basic approach:
3882 // - Each exiting thread registers its intent to exit and then does so.
3883 // - A thread trying to terminate the process must wait for all
3884 // threads currently exiting to complete their exit.
3885
3886 if (os::win32::has_exit_bug()) {
3887 // The array holds handles of the threads that have started exiting by calling
3888 // _endthreadex().
3889 // Should be large enough to avoid blocking the exiting thread due to lack of
3890 // a free slot.
3891 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3892 static int handle_count = 0;
3893
3894 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3895 static CRITICAL_SECTION crit_sect;
3896 static volatile DWORD process_exiting = 0;
3897 int i, j;
3898 DWORD res;
3899 HANDLE hproc, hthr;
3900
3901 // We only attempt to register threads until a process exiting
3902 // thread manages to set the process_exiting flag. Any threads
3903 // that come through here after the process_exiting flag is set
3904 // are unregistered and will be caught in the SuspendThread()
3905 // infinite loop below.
3906 bool registered = false;
3907
3908 // The first thread that reached this point, initializes the critical section.
3909 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3910 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3911 } else if (Atomic::load_acquire(&process_exiting) == 0) {
3912 if (what != EPT_THREAD) {
3913 // Atomically set process_exiting before the critical section
3914 // to increase the visibility between racing threads.
3915 Atomic::cmpxchg(&process_exiting, (DWORD)0, GetCurrentThreadId());
3916 }
3917 EnterCriticalSection(&crit_sect);
3918
3919 if (what == EPT_THREAD && Atomic::load_acquire(&process_exiting) == 0) {
3920 // Remove from the array those handles of the threads that have completed exiting.
3921 for (i = 0, j = 0; i < handle_count; ++i) {
3922 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3923 if (res == WAIT_TIMEOUT) {
3924 handles[j++] = handles[i];
3925 } else {
3926 if (res == WAIT_FAILED) {
3927 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3928 GetLastError(), __FILE__, __LINE__);
3929 }
3930 // Don't keep the handle, if we failed waiting for it.
3931 CloseHandle(handles[i]);
3932 }
3933 }
3934
3935 // If there's no free slot in the array of the kept handles, we'll have to
3936 // wait until at least one thread completes exiting.
3937 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3938 // Raise the priority of the oldest exiting thread to increase its chances
3939 // to complete sooner.
3940 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3941 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3942 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3943 i = (res - WAIT_OBJECT_0);
3944 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3945 for (; i < handle_count; ++i) {
3946 handles[i] = handles[i + 1];
3947 }
3948 } else {
3949 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3950 (res == WAIT_FAILED ? "failed" : "timed out"),
3951 GetLastError(), __FILE__, __LINE__);
3952 // Don't keep handles, if we failed waiting for them.
3953 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3954 CloseHandle(handles[i]);
3955 }
3956 handle_count = 0;
3957 }
3958 }
3959
3960 // Store a duplicate of the current thread handle in the array of handles.
3961 hproc = GetCurrentProcess();
3962 hthr = GetCurrentThread();
3963 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3964 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3965 warning("DuplicateHandle failed (%u) in %s: %d\n",
3966 GetLastError(), __FILE__, __LINE__);
3967
3968 // We can't register this thread (no more handles) so this thread
3969 // may be racing with a thread that is calling exit(). If the thread
3970 // that is calling exit() has managed to set the process_exiting
3971 // flag, then this thread will be caught in the SuspendThread()
3972 // infinite loop below which closes that race. A small timing
3973 // window remains before the process_exiting flag is set, but it
3974 // is only exposed when we are out of handles.
3975 } else {
3976 ++handle_count;
3977 registered = true;
3978
3979 // The current exiting thread has stored its handle in the array, and now
3980 // should leave the critical section before calling _endthreadex().
3981 }
3982
3983 } else if (what != EPT_THREAD && handle_count > 0) {
3984 jlong start_time, finish_time, timeout_left;
3985 // Before ending the process, make sure all the threads that had called
3986 // _endthreadex() completed.
3987
3988 // Set the priority level of the current thread to the same value as
3989 // the priority level of exiting threads.
3990 // This is to ensure it will be given a fair chance to execute if
3991 // the timeout expires.
3992 hthr = GetCurrentThread();
3993 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3994 start_time = os::javaTimeNanos();
3995 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3996 for (i = 0; ; ) {
3997 int portion_count = handle_count - i;
3998 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3999 portion_count = MAXIMUM_WAIT_OBJECTS;
4000 }
4001 for (j = 0; j < portion_count; ++j) {
4002 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4003 }
4004 timeout_left = (finish_time - start_time) / 1000000L;
4005 if (timeout_left < 0) {
4006 timeout_left = 0;
4007 }
4008 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4009 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4010 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4011 (res == WAIT_FAILED ? "failed" : "timed out"),
4012 GetLastError(), __FILE__, __LINE__);
4013 // Reset portion_count so we close the remaining
4014 // handles due to this error.
4015 portion_count = handle_count - i;
4016 }
4017 for (j = 0; j < portion_count; ++j) {
4018 CloseHandle(handles[i + j]);
4019 }
4020 if ((i += portion_count) >= handle_count) {
4021 break;
4022 }
4023 start_time = os::javaTimeNanos();
4024 }
4025 handle_count = 0;
4026 }
4027
4028 LeaveCriticalSection(&crit_sect);
4029 }
4030
4031 if (!registered &&
4032 Atomic::load_acquire(&process_exiting) != 0 &&
4033 process_exiting != GetCurrentThreadId()) {
4034 // Some other thread is about to call exit(), so we don't let
4035 // the current unregistered thread proceed to exit() or _endthreadex()
4036 while (true) {
4037 SuspendThread(GetCurrentThread());
4038 // Avoid busy-wait loop, if SuspendThread() failed.
4039 Sleep(EXIT_TIMEOUT);
4040 }
4041 }
4042 }
4043
4044 // We are here if either
4045 // - there's no 'race at exit' bug on this OS release;
4046 // - initialization of the critical section failed (unlikely);
4047 // - the current thread has registered itself and left the critical section;
4048 // - the process-exiting thread has raised the flag and left the critical section.
4049 if (what == EPT_THREAD) {
4050 _endthreadex((unsigned)exit_code);
4051 } else if (what == EPT_PROCESS) {
4052 ::exit(exit_code);
4053 } else {
4054 _exit(exit_code);
4055 }
4056
4057 // Should not reach here
4058 return exit_code;
4059 }
4060
4061 #undef EXIT_TIMEOUT
4062
4063 void os::win32::setmode_streams() {
4064 _setmode(_fileno(stdin), _O_BINARY);
4065 _setmode(_fileno(stdout), _O_BINARY);
4066 _setmode(_fileno(stderr), _O_BINARY);
4067 }
4068
4069 void os::wait_for_keypress_at_exit(void) {
4070 if (PauseAtExit) {
4071 fprintf(stderr, "Press any key to continue...\n");
4072 fgetc(stdin);
4073 }
4074 }
4075
4076
4077 bool os::message_box(const char* title, const char* message) {
4078 int result = MessageBox(NULL, message, title,
4079 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4080 return result == IDYES;
4081 }
4082
4083 #ifndef PRODUCT
4084 #ifndef _WIN64
4085 // Helpers to check whether NX protection is enabled
4086 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4087 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4088 pex->ExceptionRecord->NumberParameters > 0 &&
4089 pex->ExceptionRecord->ExceptionInformation[0] ==
4090 EXCEPTION_INFO_EXEC_VIOLATION) {
4091 return EXCEPTION_EXECUTE_HANDLER;
4092 }
4093 return EXCEPTION_CONTINUE_SEARCH;
4094 }
4095
4096 void nx_check_protection() {
4097 // If NX is enabled we'll get an exception calling into code on the stack
4098 char code[] = { (char)0xC3 }; // ret
4099 void *code_ptr = (void *)code;
4100 __try {
4101 __asm call code_ptr
4102 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4103 tty->print_raw_cr("NX protection detected.");
4104 }
4105 }
4106 #endif // _WIN64
4107 #endif // PRODUCT
4108
4109 // This is called _before_ the global arguments have been parsed
4110 void os::init(void) {
4111 _initial_pid = _getpid();
4112
4113 init_random(1234567);
4114
4115 win32::initialize_system_info();
4116 win32::setmode_streams();
4117 init_page_sizes((size_t) win32::vm_page_size());
4118
4119 // This may be overridden later when argument processing is done.
4120 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
4121
4122 // Initialize main_process and main_thread
4123 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4124 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4125 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4126 fatal("DuplicateHandle failed\n");
4127 }
4128 main_thread_id = (int) GetCurrentThreadId();
4129
4130 // initialize fast thread access - only used for 32-bit
4131 win32::initialize_thread_ptr_offset();
4132 }
4133
4134 // To install functions for atexit processing
4135 extern "C" {
4136 static void perfMemory_exit_helper() {
4137 perfMemory_exit();
4138 }
4139 }
4140
4141 static jint initSock();
4142
4143 // this is called _after_ the global arguments have been parsed
4144 jint os::init_2(void) {
4145
4146 // This could be set any time but all platforms
4147 // have to set it the same so we have to mirror Solaris.
4148 DEBUG_ONLY(os::set_mutex_init_done();)
4149
4150 // Setup Windows Exceptions
4151
4152 #if INCLUDE_AOT
4153 // If AOT is enabled we need to install a vectored exception handler
4154 // in order to forward implicit exceptions from code in AOT
4155 // generated DLLs. This is necessary since these DLLs are not
4156 // registered for structured exceptions like codecache methods are.
4157 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4158 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4159 }
4160 #endif
4161
4162 // for debugging float code generation bugs
4163 if (ForceFloatExceptions) {
4164 #ifndef _WIN64
4165 static long fp_control_word = 0;
4166 __asm { fstcw fp_control_word }
4167 // see Intel PPro Manual, Vol. 2, p 7-16
4168 const long precision = 0x20;
4169 const long underflow = 0x10;
4170 const long overflow = 0x08;
4171 const long zero_div = 0x04;
4172 const long denorm = 0x02;
4173 const long invalid = 0x01;
4174 fp_control_word |= invalid;
4175 __asm { fldcw fp_control_word }
4176 #endif
4177 }
4178
4179 // If stack_commit_size is 0, windows will reserve the default size,
4180 // but only commit a small portion of it.
4181 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4182 size_t default_reserve_size = os::win32::default_stack_size();
4183 size_t actual_reserve_size = stack_commit_size;
4184 if (stack_commit_size < default_reserve_size) {
4185 // If stack_commit_size == 0, we want this too
4186 actual_reserve_size = default_reserve_size;
4187 }
4188
4189 // Check minimum allowable stack size for thread creation and to initialize
4190 // the java system classes, including StackOverflowError - depends on page
4191 // size. Add two 4K pages for compiler2 recursion in main thread.
4192 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4193 // class initialization depending on 32 or 64 bit VM.
4194 size_t min_stack_allowed =
4195 (size_t)(JavaThread::stack_guard_zone_size() +
4196 JavaThread::stack_shadow_zone_size() +
4197 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4198
4199 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4200
4201 if (actual_reserve_size < min_stack_allowed) {
4202 tty->print_cr("\nThe Java thread stack size specified is too small. "
4203 "Specify at least %dk",
4204 min_stack_allowed / K);
4205 return JNI_ERR;
4206 }
4207
4208 JavaThread::set_stack_size_at_create(stack_commit_size);
4209
4210 // Calculate theoretical max. size of Threads to guard gainst artifical
4211 // out-of-memory situations, where all available address-space has been
4212 // reserved by thread stacks.
4213 assert(actual_reserve_size != 0, "Must have a stack");
4214
4215 // Calculate the thread limit when we should start doing Virtual Memory
4216 // banging. Currently when the threads will have used all but 200Mb of space.
4217 //
4218 // TODO: consider performing a similar calculation for commit size instead
4219 // as reserve size, since on a 64-bit platform we'll run into that more
4220 // often than running out of virtual memory space. We can use the
4221 // lower value of the two calculations as the os_thread_limit.
4222 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4223 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4224
4225 // at exit methods are called in the reverse order of their registration.
4226 // there is no limit to the number of functions registered. atexit does
4227 // not set errno.
4228
4229 if (PerfAllowAtExitRegistration) {
4230 // only register atexit functions if PerfAllowAtExitRegistration is set.
4231 // atexit functions can be delayed until process exit time, which
4232 // can be problematic for embedded VM situations. Embedded VMs should
4233 // call DestroyJavaVM() to assure that VM resources are released.
4234
4235 // note: perfMemory_exit_helper atexit function may be removed in
4236 // the future if the appropriate cleanup code can be added to the
4237 // VM_Exit VMOperation's doit method.
4238 if (atexit(perfMemory_exit_helper) != 0) {
4239 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4240 }
4241 }
4242
4243 #ifndef _WIN64
4244 // Print something if NX is enabled (win32 on AMD64)
4245 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4246 #endif
4247
4248 // initialize thread priority policy
4249 prio_init();
4250
4251 if (UseNUMA && !ForceNUMA) {
4252 UseNUMA = false; // We don't fully support this yet
4253 }
4254
4255 if (UseNUMAInterleaving || (UseNUMA && FLAG_IS_DEFAULT(UseNUMAInterleaving))) {
4256 if (!numa_interleaving_init()) {
4257 FLAG_SET_ERGO(UseNUMAInterleaving, false);
4258 } else if (!UseNUMAInterleaving) {
4259 // When NUMA requested, not-NUMA-aware allocations default to interleaving.
4260 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4261 }
4262 }
4263
4264 if (initSock() != JNI_OK) {
4265 return JNI_ERR;
4266 }
4267
4268 SymbolEngine::recalc_search_path();
4269
4270 // Initialize data for jdk.internal.misc.Signal
4271 if (!ReduceSignalUsage) {
4272 jdk_misc_signal_init();
4273 }
4274
4275 return JNI_OK;
4276 }
4277
4278 // combine the high and low DWORD into a ULONGLONG
4279 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4280 ULONGLONG value = high_word;
4281 value <<= sizeof(high_word) * 8;
4282 value |= low_word;
4283 return value;
4284 }
4285
4286 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4287 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4288 ::memset((void*)sbuf, 0, sizeof(struct stat));
4289 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4290 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4291 file_data.ftLastWriteTime.dwLowDateTime);
4292 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4293 file_data.ftCreationTime.dwLowDateTime);
4294 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4295 file_data.ftLastAccessTime.dwLowDateTime);
4296 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4297 sbuf->st_mode |= S_IFDIR;
4298 } else {
4299 sbuf->st_mode |= S_IFREG;
4300 }
4301 }
4302
4303 static errno_t convert_to_unicode(char const* char_path, LPWSTR* unicode_path) {
4304 // Get required buffer size to convert to Unicode
4305 int unicode_path_len = MultiByteToWideChar(CP_ACP,
4306 MB_ERR_INVALID_CHARS,
4307 char_path, -1,
4308 NULL, 0);
4309 if (unicode_path_len == 0) {
4310 return EINVAL;
4311 }
4312
4313 *unicode_path = NEW_C_HEAP_ARRAY(WCHAR, unicode_path_len, mtInternal);
4314
4315 int result = MultiByteToWideChar(CP_ACP,
4316 MB_ERR_INVALID_CHARS,
4317 char_path, -1,
4318 *unicode_path, unicode_path_len);
4319 assert(result == unicode_path_len, "length already checked above");
4320
4321 return ERROR_SUCCESS;
4322 }
4323
4324 static errno_t get_full_path(LPCWSTR unicode_path, LPWSTR* full_path) {
4325 // Get required buffer size to convert to full path. The return
4326 // value INCLUDES the terminating null character.
4327 DWORD full_path_len = GetFullPathNameW(unicode_path, 0, NULL, NULL);
4328 if (full_path_len == 0) {
4329 return EINVAL;
4330 }
4331
4332 *full_path = NEW_C_HEAP_ARRAY(WCHAR, full_path_len, mtInternal);
4333
4334 // When the buffer has sufficient size, the return value EXCLUDES the
4335 // terminating null character
4336 DWORD result = GetFullPathNameW(unicode_path, full_path_len, *full_path, NULL);
4337 assert(result <= full_path_len, "length already checked above");
4338
4339 return ERROR_SUCCESS;
4340 }
4341
4342 static void set_path_prefix(char* buf, LPWSTR* prefix, int* prefix_off, bool* needs_fullpath) {
4343 *prefix_off = 0;
4344 *needs_fullpath = true;
4345
4346 if (::isalpha(buf[0]) && !::IsDBCSLeadByte(buf[0]) && buf[1] == ':' && buf[2] == '\\') {
4347 *prefix = L"\\\\?\\";
4348 } else if (buf[0] == '\\' && buf[1] == '\\') {
4349 if (buf[2] == '?' && buf[3] == '\\') {
4350 *prefix = L"";
4351 *needs_fullpath = false;
4352 } else {
4353 *prefix = L"\\\\?\\UNC";
4354 *prefix_off = 1; // Overwrite the first char with the prefix, so \\share\path becomes \\?\UNC\share\path
4355 }
4356 } else {
4357 *prefix = L"\\\\?\\";
4358 }
4359 }
4360
4361 // Returns the given path as an absolute wide path in unc format. The returned path is NULL
4362 // on error (with err being set accordingly) and should be freed via os::free() otherwise.
4363 // additional_space is the size of space, in wchar_t, the function will additionally add to
4364 // the allocation of return buffer (such that the size of the returned buffer is at least
4365 // wcslen(buf) + 1 + additional_space).
4366 static wchar_t* wide_abs_unc_path(char const* path, errno_t & err, int additional_space = 0) {
4367 if ((path == NULL) || (path[0] == '\0')) {
4368 err = ENOENT;
4369 return NULL;
4370 }
4371
4372 // Need to allocate at least room for 3 characters, since os::native_path transforms C: to C:.
4373 size_t buf_len = 1 + MAX2((size_t)3, strlen(path));
4374 char* buf = NEW_C_HEAP_ARRAY(char, buf_len, mtInternal);
4375 strncpy(buf, path, buf_len);
4376 os::native_path(buf);
4377
4378 LPWSTR prefix = NULL;
4379 int prefix_off = 0;
4380 bool needs_fullpath = true;
4381 set_path_prefix(buf, &prefix, &prefix_off, &needs_fullpath);
4382
4383 LPWSTR unicode_path = NULL;
4384 err = convert_to_unicode(buf, &unicode_path);
4385 FREE_C_HEAP_ARRAY(char, buf);
4386 if (err != ERROR_SUCCESS) {
4387 return NULL;
4388 }
4389
4390 LPWSTR converted_path = NULL;
4391 if (needs_fullpath) {
4392 err = get_full_path(unicode_path, &converted_path);
4393 } else {
4394 converted_path = unicode_path;
4395 }
4396
4397 LPWSTR result = NULL;
4398 if (converted_path != NULL) {
4399 size_t prefix_len = wcslen(prefix);
4400 size_t result_len = prefix_len - prefix_off + wcslen(converted_path) + additional_space + 1;
4401 result = NEW_C_HEAP_ARRAY(WCHAR, result_len, mtInternal);
4402 _snwprintf(result, result_len, L"%s%s", prefix, &converted_path[prefix_off]);
4403
4404 // Remove trailing pathsep (not for \\?\<DRIVE>:\, since it would make it relative)
4405 result_len = wcslen(result);
4406 if ((result[result_len - 1] == L'\\') &&
4407 !(::iswalpha(result[4]) && result[5] == L':' && result_len == 7)) {
4408 result[result_len - 1] = L'\0';
4409 }
4410 }
4411
4412 if (converted_path != unicode_path) {
4413 FREE_C_HEAP_ARRAY(WCHAR, converted_path);
4414 }
4415 FREE_C_HEAP_ARRAY(WCHAR, unicode_path);
4416
4417 return static_cast<wchar_t*>(result); // LPWSTR and wchat_t* are the same type on Windows.
4418 }
4419
4420 int os::stat(const char *path, struct stat *sbuf) {
4421 errno_t err;
4422 wchar_t* wide_path = wide_abs_unc_path(path, err);
4423
4424 if (wide_path == NULL) {
4425 errno = err;
4426 return -1;
4427 }
4428
4429 WIN32_FILE_ATTRIBUTE_DATA file_data;;
4430 BOOL bret = ::GetFileAttributesExW(wide_path, GetFileExInfoStandard, &file_data);
4431 os::free(wide_path);
4432
4433 if (!bret) {
4434 errno = ::GetLastError();
4435 return -1;
4436 }
4437
4438 file_attribute_data_to_stat(sbuf, file_data);
4439 return 0;
4440 }
4441
4442 static HANDLE create_read_only_file_handle(const char* file) {
4443 errno_t err;
4444 wchar_t* wide_path = wide_abs_unc_path(file, err);
4445
4446 if (wide_path == NULL) {
4447 errno = err;
4448 return INVALID_HANDLE_VALUE;
4449 }
4450
4451 HANDLE handle = ::CreateFileW(wide_path, 0, FILE_SHARE_READ,
4452 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4453 os::free(wide_path);
4454
4455 return handle;
4456 }
4457
4458 bool os::same_files(const char* file1, const char* file2) {
4459
4460 if (file1 == NULL && file2 == NULL) {
4461 return true;
4462 }
4463
4464 if (file1 == NULL || file2 == NULL) {
4465 return false;
4466 }
4467
4468 if (strcmp(file1, file2) == 0) {
4469 return true;
4470 }
4471
4472 HANDLE handle1 = create_read_only_file_handle(file1);
4473 HANDLE handle2 = create_read_only_file_handle(file2);
4474 bool result = false;
4475
4476 // if we could open both paths...
4477 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4478 BY_HANDLE_FILE_INFORMATION fileInfo1;
4479 BY_HANDLE_FILE_INFORMATION fileInfo2;
4480 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4481 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4482 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4483 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4484 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4485 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4486 result = true;
4487 }
4488 }
4489 }
4490
4491 //free the handles
4492 if (handle1 != INVALID_HANDLE_VALUE) {
4493 ::CloseHandle(handle1);
4494 }
4495
4496 if (handle2 != INVALID_HANDLE_VALUE) {
4497 ::CloseHandle(handle2);
4498 }
4499
4500 return result;
4501 }
4502
4503 #define FT2INT64(ft) \
4504 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4505
4506
4507 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4508 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4509 // of a thread.
4510 //
4511 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4512 // the fast estimate available on the platform.
4513
4514 // current_thread_cpu_time() is not optimized for Windows yet
4515 jlong os::current_thread_cpu_time() {
4516 // return user + sys since the cost is the same
4517 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4518 }
4519
4520 jlong os::thread_cpu_time(Thread* thread) {
4521 // consistent with what current_thread_cpu_time() returns.
4522 return os::thread_cpu_time(thread, true /* user+sys */);
4523 }
4524
4525 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4526 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4527 }
4528
4529 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4530 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4531 // If this function changes, os::is_thread_cpu_time_supported() should too
4532 FILETIME CreationTime;
4533 FILETIME ExitTime;
4534 FILETIME KernelTime;
4535 FILETIME UserTime;
4536
4537 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4538 &ExitTime, &KernelTime, &UserTime) == 0) {
4539 return -1;
4540 } else if (user_sys_cpu_time) {
4541 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4542 } else {
4543 return FT2INT64(UserTime) * 100;
4544 }
4545 }
4546
4547 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4548 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4549 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4550 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4551 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4552 }
4553
4554 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4555 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4556 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4557 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4558 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4559 }
4560
4561 bool os::is_thread_cpu_time_supported() {
4562 // see os::thread_cpu_time
4563 FILETIME CreationTime;
4564 FILETIME ExitTime;
4565 FILETIME KernelTime;
4566 FILETIME UserTime;
4567
4568 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4569 &KernelTime, &UserTime) == 0) {
4570 return false;
4571 } else {
4572 return true;
4573 }
4574 }
4575
4576 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4577 // It does have primitives (PDH API) to get CPU usage and run queue length.
4578 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4579 // If we wanted to implement loadavg on Windows, we have a few options:
4580 //
4581 // a) Query CPU usage and run queue length and "fake" an answer by
4582 // returning the CPU usage if it's under 100%, and the run queue
4583 // length otherwise. It turns out that querying is pretty slow
4584 // on Windows, on the order of 200 microseconds on a fast machine.
4585 // Note that on the Windows the CPU usage value is the % usage
4586 // since the last time the API was called (and the first call
4587 // returns 100%), so we'd have to deal with that as well.
4588 //
4589 // b) Sample the "fake" answer using a sampling thread and store
4590 // the answer in a global variable. The call to loadavg would
4591 // just return the value of the global, avoiding the slow query.
4592 //
4593 // c) Sample a better answer using exponential decay to smooth the
4594 // value. This is basically the algorithm used by UNIX kernels.
4595 //
4596 // Note that sampling thread starvation could affect both (b) and (c).
4597 int os::loadavg(double loadavg[], int nelem) {
4598 return -1;
4599 }
4600
4601
4602 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4603 bool os::dont_yield() {
4604 return DontYieldALot;
4605 }
4606
4607 int os::open(const char *path, int oflag, int mode) {
4608 errno_t err;
4609 wchar_t* wide_path = wide_abs_unc_path(path, err);
4610
4611 if (wide_path == NULL) {
4612 errno = err;
4613 return -1;
4614 }
4615 int fd = ::_wopen(wide_path, oflag | O_BINARY | O_NOINHERIT, mode);
4616 os::free(wide_path);
4617
4618 if (fd == -1) {
4619 errno = ::GetLastError();
4620 }
4621
4622 return fd;
4623 }
4624
4625 FILE* os::open(int fd, const char* mode) {
4626 return ::_fdopen(fd, mode);
4627 }
4628
4629 // Is a (classpath) directory empty?
4630 bool os::dir_is_empty(const char* path) {
4631 errno_t err;
4632 wchar_t* wide_path = wide_abs_unc_path(path, err, 2);
4633
4634 if (wide_path == NULL) {
4635 errno = err;
4636 return false;
4637 }
4638
4639 // Make sure we end with "\\*"
4640 if (wide_path[wcslen(wide_path) - 1] == L'\\') {
4641 wcscat(wide_path, L"*");
4642 } else {
4643 wcscat(wide_path, L"\\*");
4644 }
4645
4646 WIN32_FIND_DATAW fd;
4647 HANDLE f = ::FindFirstFileW(wide_path, &fd);
4648 os::free(wide_path);
4649 bool is_empty = true;
4650
4651 if (f != INVALID_HANDLE_VALUE) {
4652 while (is_empty && ::FindNextFileW(f, &fd)) {
4653 // An empty directory contains only the current directory file
4654 // and the previous directory file.
4655 if ((wcscmp(fd.cFileName, L".") != 0) &&
4656 (wcscmp(fd.cFileName, L"..") != 0)) {
4657 is_empty = false;
4658 }
4659 }
4660 FindClose(f);
4661 } else {
4662 errno = ::GetLastError();
4663 }
4664
4665 return is_empty;
4666 }
4667
4668 // create binary file, rewriting existing file if required
4669 int os::create_binary_file(const char* path, bool rewrite_existing) {
4670 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4671 if (!rewrite_existing) {
4672 oflags |= _O_EXCL;
4673 }
4674 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4675 }
4676
4677 // return current position of file pointer
4678 jlong os::current_file_offset(int fd) {
4679 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4680 }
4681
4682 // move file pointer to the specified offset
4683 jlong os::seek_to_file_offset(int fd, jlong offset) {
4684 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4685 }
4686
4687
4688 jlong os::lseek(int fd, jlong offset, int whence) {
4689 return (jlong) ::_lseeki64(fd, offset, whence);
4690 }
4691
4692 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4693 OVERLAPPED ov;
4694 DWORD nread;
4695 BOOL result;
4696
4697 ZeroMemory(&ov, sizeof(ov));
4698 ov.Offset = (DWORD)offset;
4699 ov.OffsetHigh = (DWORD)(offset >> 32);
4700
4701 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4702
4703 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4704
4705 return result ? nread : 0;
4706 }
4707
4708
4709 // This method is a slightly reworked copy of JDK's sysNativePath
4710 // from src/windows/hpi/src/path_md.c
4711
4712 // Convert a pathname to native format. On win32, this involves forcing all
4713 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4714 // sometimes rejects '/') and removing redundant separators. The input path is
4715 // assumed to have been converted into the character encoding used by the local
4716 // system. Because this might be a double-byte encoding, care is taken to
4717 // treat double-byte lead characters correctly.
4718 //
4719 // This procedure modifies the given path in place, as the result is never
4720 // longer than the original. There is no error return; this operation always
4721 // succeeds.
4722 char * os::native_path(char *path) {
4723 char *src = path, *dst = path, *end = path;
4724 char *colon = NULL; // If a drive specifier is found, this will
4725 // point to the colon following the drive letter
4726
4727 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4728 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4729 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4730
4731 // Check for leading separators
4732 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4733 while (isfilesep(*src)) {
4734 src++;
4735 }
4736
4737 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4738 // Remove leading separators if followed by drive specifier. This
4739 // hack is necessary to support file URLs containing drive
4740 // specifiers (e.g., "file://c:/path"). As a side effect,
4741 // "/c:/path" can be used as an alternative to "c:/path".
4742 *dst++ = *src++;
4743 colon = dst;
4744 *dst++ = ':';
4745 src++;
4746 } else {
4747 src = path;
4748 if (isfilesep(src[0]) && isfilesep(src[1])) {
4749 // UNC pathname: Retain first separator; leave src pointed at
4750 // second separator so that further separators will be collapsed
4751 // into the second separator. The result will be a pathname
4752 // beginning with "\\\\" followed (most likely) by a host name.
4753 src = dst = path + 1;
4754 path[0] = '\\'; // Force first separator to '\\'
4755 }
4756 }
4757
4758 end = dst;
4759
4760 // Remove redundant separators from remainder of path, forcing all
4761 // separators to be '\\' rather than '/'. Also, single byte space
4762 // characters are removed from the end of the path because those
4763 // are not legal ending characters on this operating system.
4764 //
4765 while (*src != '\0') {
4766 if (isfilesep(*src)) {
4767 *dst++ = '\\'; src++;
4768 while (isfilesep(*src)) src++;
4769 if (*src == '\0') {
4770 // Check for trailing separator
4771 end = dst;
4772 if (colon == dst - 2) break; // "z:\\"
4773 if (dst == path + 1) break; // "\\"
4774 if (dst == path + 2 && isfilesep(path[0])) {
4775 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4776 // beginning of a UNC pathname. Even though it is not, by
4777 // itself, a valid UNC pathname, we leave it as is in order
4778 // to be consistent with the path canonicalizer as well
4779 // as the win32 APIs, which treat this case as an invalid
4780 // UNC pathname rather than as an alias for the root
4781 // directory of the current drive.
4782 break;
4783 }
4784 end = --dst; // Path does not denote a root directory, so
4785 // remove trailing separator
4786 break;
4787 }
4788 end = dst;
4789 } else {
4790 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4791 *dst++ = *src++;
4792 if (*src) *dst++ = *src++;
4793 end = dst;
4794 } else { // Copy a single-byte character
4795 char c = *src++;
4796 *dst++ = c;
4797 // Space is not a legal ending character
4798 if (c != ' ') end = dst;
4799 }
4800 }
4801 }
4802
4803 *end = '\0';
4804
4805 // For "z:", add "." to work around a bug in the C runtime library
4806 if (colon == dst - 1) {
4807 path[2] = '.';
4808 path[3] = '\0';
4809 }
4810
4811 return path;
4812 }
4813
4814 // This code is a copy of JDK's sysSetLength
4815 // from src/windows/hpi/src/sys_api_md.c
4816
4817 int os::ftruncate(int fd, jlong length) {
4818 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4819 long high = (long)(length >> 32);
4820 DWORD ret;
4821
4822 if (h == (HANDLE)(-1)) {
4823 return -1;
4824 }
4825
4826 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4827 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4828 return -1;
4829 }
4830
4831 if (::SetEndOfFile(h) == FALSE) {
4832 return -1;
4833 }
4834
4835 return 0;
4836 }
4837
4838 int os::get_fileno(FILE* fp) {
4839 return _fileno(fp);
4840 }
4841
4842 // This code is a copy of JDK's sysSync
4843 // from src/windows/hpi/src/sys_api_md.c
4844 // except for the legacy workaround for a bug in Win 98
4845
4846 int os::fsync(int fd) {
4847 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4848
4849 if ((!::FlushFileBuffers(handle)) &&
4850 (GetLastError() != ERROR_ACCESS_DENIED)) {
4851 // from winerror.h
4852 return -1;
4853 }
4854 return 0;
4855 }
4856
4857 static int nonSeekAvailable(int, long *);
4858 static int stdinAvailable(int, long *);
4859
4860 // This code is a copy of JDK's sysAvailable
4861 // from src/windows/hpi/src/sys_api_md.c
4862
4863 int os::available(int fd, jlong *bytes) {
4864 jlong cur, end;
4865 struct _stati64 stbuf64;
4866
4867 if (::_fstati64(fd, &stbuf64) >= 0) {
4868 int mode = stbuf64.st_mode;
4869 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4870 int ret;
4871 long lpbytes;
4872 if (fd == 0) {
4873 ret = stdinAvailable(fd, &lpbytes);
4874 } else {
4875 ret = nonSeekAvailable(fd, &lpbytes);
4876 }
4877 (*bytes) = (jlong)(lpbytes);
4878 return ret;
4879 }
4880 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4881 return FALSE;
4882 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4883 return FALSE;
4884 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4885 return FALSE;
4886 }
4887 *bytes = end - cur;
4888 return TRUE;
4889 } else {
4890 return FALSE;
4891 }
4892 }
4893
4894 void os::flockfile(FILE* fp) {
4895 _lock_file(fp);
4896 }
4897
4898 void os::funlockfile(FILE* fp) {
4899 _unlock_file(fp);
4900 }
4901
4902 // This code is a copy of JDK's nonSeekAvailable
4903 // from src/windows/hpi/src/sys_api_md.c
4904
4905 static int nonSeekAvailable(int fd, long *pbytes) {
4906 // This is used for available on non-seekable devices
4907 // (like both named and anonymous pipes, such as pipes
4908 // connected to an exec'd process).
4909 // Standard Input is a special case.
4910 HANDLE han;
4911
4912 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4913 return FALSE;
4914 }
4915
4916 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4917 // PeekNamedPipe fails when at EOF. In that case we
4918 // simply make *pbytes = 0 which is consistent with the
4919 // behavior we get on Solaris when an fd is at EOF.
4920 // The only alternative is to raise an Exception,
4921 // which isn't really warranted.
4922 //
4923 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4924 return FALSE;
4925 }
4926 *pbytes = 0;
4927 }
4928 return TRUE;
4929 }
4930
4931 #define MAX_INPUT_EVENTS 2000
4932
4933 // This code is a copy of JDK's stdinAvailable
4934 // from src/windows/hpi/src/sys_api_md.c
4935
4936 static int stdinAvailable(int fd, long *pbytes) {
4937 HANDLE han;
4938 DWORD numEventsRead = 0; // Number of events read from buffer
4939 DWORD numEvents = 0; // Number of events in buffer
4940 DWORD i = 0; // Loop index
4941 DWORD curLength = 0; // Position marker
4942 DWORD actualLength = 0; // Number of bytes readable
4943 BOOL error = FALSE; // Error holder
4944 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4945
4946 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4947 return FALSE;
4948 }
4949
4950 // Construct an array of input records in the console buffer
4951 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4952 if (error == 0) {
4953 return nonSeekAvailable(fd, pbytes);
4954 }
4955
4956 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4957 if (numEvents > MAX_INPUT_EVENTS) {
4958 numEvents = MAX_INPUT_EVENTS;
4959 }
4960
4961 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4962 if (lpBuffer == NULL) {
4963 return FALSE;
4964 }
4965
4966 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4967 if (error == 0) {
4968 os::free(lpBuffer);
4969 return FALSE;
4970 }
4971
4972 // Examine input records for the number of bytes available
4973 for (i=0; i<numEvents; i++) {
4974 if (lpBuffer[i].EventType == KEY_EVENT) {
4975
4976 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4977 &(lpBuffer[i].Event);
4978 if (keyRecord->bKeyDown == TRUE) {
4979 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4980 curLength++;
4981 if (*keyPressed == '\r') {
4982 actualLength = curLength;
4983 }
4984 }
4985 }
4986 }
4987
4988 if (lpBuffer != NULL) {
4989 os::free(lpBuffer);
4990 }
4991
4992 *pbytes = (long) actualLength;
4993 return TRUE;
4994 }
4995
4996 // Map a block of memory.
4997 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4998 char *addr, size_t bytes, bool read_only,
4999 bool allow_exec) {
5000 HANDLE hFile;
5001 char* base;
5002
5003 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
5004 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
5005 if (hFile == NULL) {
5006 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
5007 return NULL;
5008 }
5009
5010 if (allow_exec) {
5011 // CreateFileMapping/MapViewOfFileEx can't map executable memory
5012 // unless it comes from a PE image (which the shared archive is not.)
5013 // Even VirtualProtect refuses to give execute access to mapped memory
5014 // that was not previously executable.
5015 //
5016 // Instead, stick the executable region in anonymous memory. Yuck.
5017 // Penalty is that ~4 pages will not be shareable - in the future
5018 // we might consider DLLizing the shared archive with a proper PE
5019 // header so that mapping executable + sharing is possible.
5020
5021 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
5022 PAGE_READWRITE);
5023 if (base == NULL) {
5024 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
5025 CloseHandle(hFile);
5026 return NULL;
5027 }
5028
5029 // Record virtual memory allocation
5030 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
5031
5032 DWORD bytes_read;
5033 OVERLAPPED overlapped;
5034 overlapped.Offset = (DWORD)file_offset;
5035 overlapped.OffsetHigh = 0;
5036 overlapped.hEvent = NULL;
5037 // ReadFile guarantees that if the return value is true, the requested
5038 // number of bytes were read before returning.
5039 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
5040 if (!res) {
5041 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
5042 release_memory(base, bytes);
5043 CloseHandle(hFile);
5044 return NULL;
5045 }
5046 } else {
5047 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
5048 NULL /* file_name */);
5049 if (hMap == NULL) {
5050 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
5051 CloseHandle(hFile);
5052 return NULL;
5053 }
5054
5055 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
5056 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
5057 (DWORD)bytes, addr);
5058 if (base == NULL) {
5059 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
5060 CloseHandle(hMap);
5061 CloseHandle(hFile);
5062 return NULL;
5063 }
5064
5065 if (CloseHandle(hMap) == 0) {
5066 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
5067 CloseHandle(hFile);
5068 return base;
5069 }
5070 }
5071
5072 if (allow_exec) {
5073 DWORD old_protect;
5074 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
5075 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
5076
5077 if (!res) {
5078 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
5079 // Don't consider this a hard error, on IA32 even if the
5080 // VirtualProtect fails, we should still be able to execute
5081 CloseHandle(hFile);
5082 return base;
5083 }
5084 }
5085
5086 if (CloseHandle(hFile) == 0) {
5087 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
5088 return base;
5089 }
5090
5091 return base;
5092 }
5093
5094
5095 // Remap a block of memory.
5096 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5097 char *addr, size_t bytes, bool read_only,
5098 bool allow_exec) {
5099 // This OS does not allow existing memory maps to be remapped so we
5100 // would have to unmap the memory before we remap it.
5101
5102 // Because there is a small window between unmapping memory and mapping
5103 // it in again with different protections, CDS archives are mapped RW
5104 // on windows, so this function isn't called.
5105 ShouldNotReachHere();
5106 return NULL;
5107 }
5108
5109
5110 // Unmap a block of memory.
5111 // Returns true=success, otherwise false.
5112
5113 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5114 MEMORY_BASIC_INFORMATION mem_info;
5115 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5116 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5117 return false;
5118 }
5119
5120 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5121 // Instead, executable region was allocated using VirtualAlloc(). See
5122 // pd_map_memory() above.
5123 //
5124 // The following flags should match the 'exec_access' flages used for
5125 // VirtualProtect() in pd_map_memory().
5126 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5127 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5128 return pd_release_memory(addr, bytes);
5129 }
5130
5131 BOOL result = UnmapViewOfFile(addr);
5132 if (result == 0) {
5133 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5134 return false;
5135 }
5136 return true;
5137 }
5138
5139 void os::pause() {
5140 char filename[MAX_PATH];
5141 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5142 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
5143 } else {
5144 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5145 }
5146
5147 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5148 if (fd != -1) {
5149 struct stat buf;
5150 ::close(fd);
5151 while (::stat(filename, &buf) == 0) {
5152 Sleep(100);
5153 }
5154 } else {
5155 jio_fprintf(stderr,
5156 "Could not open pause file '%s', continuing immediately.\n", filename);
5157 }
5158 }
5159
5160 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5161 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5162 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5163
5164 os::ThreadCrashProtection::ThreadCrashProtection() {
5165 }
5166
5167 // See the caveats for this class in os_windows.hpp
5168 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5169 // into this method and returns false. If no OS EXCEPTION was raised, returns
5170 // true.
5171 // The callback is supposed to provide the method that should be protected.
5172 //
5173 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5174
5175 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5176
5177 _protected_thread = Thread::current_or_null();
5178 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5179
5180 bool success = true;
5181 __try {
5182 _crash_protection = this;
5183 cb.call();
5184 } __except(EXCEPTION_EXECUTE_HANDLER) {
5185 // only for protection, nothing to do
5186 success = false;
5187 }
5188 _crash_protection = NULL;
5189 _protected_thread = NULL;
5190 Thread::muxRelease(&_crash_mux);
5191 return success;
5192 }
5193
5194
5195 class HighResolutionInterval : public CHeapObj<mtThread> {
5196 // The default timer resolution seems to be 10 milliseconds.
5197 // (Where is this written down?)
5198 // If someone wants to sleep for only a fraction of the default,
5199 // then we set the timer resolution down to 1 millisecond for
5200 // the duration of their interval.
5201 // We carefully set the resolution back, since otherwise we
5202 // seem to incur an overhead (3%?) that we don't need.
5203 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
5204 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
5205 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
5206 // timeBeginPeriod() if the relative error exceeded some threshold.
5207 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
5208 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
5209 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
5210 // resolution timers running.
5211 private:
5212 jlong resolution;
5213 public:
5214 HighResolutionInterval(jlong ms) {
5215 resolution = ms % 10L;
5216 if (resolution != 0) {
5217 MMRESULT result = timeBeginPeriod(1L);
5218 }
5219 }
5220 ~HighResolutionInterval() {
5221 if (resolution != 0) {
5222 MMRESULT result = timeEndPeriod(1L);
5223 }
5224 resolution = 0L;
5225 }
5226 };
5227
5228 // An Event wraps a win32 "CreateEvent" kernel handle.
5229 //
5230 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5231 //
5232 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5233 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5234 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5235 // In addition, an unpark() operation might fetch the handle field, but the
5236 // event could recycle between the fetch and the SetEvent() operation.
5237 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5238 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5239 // on an stale but recycled handle would be harmless, but in practice this might
5240 // confuse other non-Sun code, so it's not a viable approach.
5241 //
5242 // 2: Once a win32 event handle is associated with an Event, it remains associated
5243 // with the Event. The event handle is never closed. This could be construed
5244 // as handle leakage, but only up to the maximum # of threads that have been extant
5245 // at any one time. This shouldn't be an issue, as windows platforms typically
5246 // permit a process to have hundreds of thousands of open handles.
5247 //
5248 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5249 // and release unused handles.
5250 //
5251 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5252 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5253 //
5254 // 5. Use an RCU-like mechanism (Read-Copy Update).
5255 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5256 //
5257 // We use (2).
5258 //
5259 // TODO-FIXME:
5260 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5261 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5262 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5263 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent
5264 // into a single win32 CreateEvent() handle.
5265 //
5266 // Assumption:
5267 // Only one parker can exist on an event, which is why we allocate
5268 // them per-thread. Multiple unparkers can coexist.
5269 //
5270 // _Event transitions in park()
5271 // -1 => -1 : illegal
5272 // 1 => 0 : pass - return immediately
5273 // 0 => -1 : block; then set _Event to 0 before returning
5274 //
5275 // _Event transitions in unpark()
5276 // 0 => 1 : just return
5277 // 1 => 1 : just return
5278 // -1 => either 0 or 1; must signal target thread
5279 // That is, we can safely transition _Event from -1 to either
5280 // 0 or 1.
5281 //
5282 // _Event serves as a restricted-range semaphore.
5283 // -1 : thread is blocked, i.e. there is a waiter
5284 // 0 : neutral: thread is running or ready,
5285 // could have been signaled after a wait started
5286 // 1 : signaled - thread is running or ready
5287 //
5288 // Another possible encoding of _Event would be with
5289 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5290 //
5291
5292 int os::PlatformEvent::park(jlong Millis) {
5293 // Transitions for _Event:
5294 // -1 => -1 : illegal
5295 // 1 => 0 : pass - return immediately
5296 // 0 => -1 : block; then set _Event to 0 before returning
5297
5298 guarantee(_ParkHandle != NULL , "Invariant");
5299 guarantee(Millis > 0 , "Invariant");
5300
5301 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5302 // the initial park() operation.
5303 // Consider: use atomic decrement instead of CAS-loop
5304
5305 int v;
5306 for (;;) {
5307 v = _Event;
5308 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5309 }
5310 guarantee((v == 0) || (v == 1), "invariant");
5311 if (v != 0) return OS_OK;
5312
5313 // Do this the hard way by blocking ...
5314 // TODO: consider a brief spin here, gated on the success of recent
5315 // spin attempts by this thread.
5316 //
5317 // We decompose long timeouts into series of shorter timed waits.
5318 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5319 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5320 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5321 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5322 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5323 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5324 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5325 // for the already waited time. This policy does not admit any new outcomes.
5326 // In the future, however, we might want to track the accumulated wait time and
5327 // adjust Millis accordingly if we encounter a spurious wakeup.
5328
5329 const int MAXTIMEOUT = 0x10000000;
5330 DWORD rv = WAIT_TIMEOUT;
5331 while (_Event < 0 && Millis > 0) {
5332 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5333 if (Millis > MAXTIMEOUT) {
5334 prd = MAXTIMEOUT;
5335 }
5336 HighResolutionInterval *phri = NULL;
5337 if (!ForceTimeHighResolution) {
5338 phri = new HighResolutionInterval(prd);
5339 }
5340 rv = ::WaitForSingleObject(_ParkHandle, prd);
5341 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5342 if (rv == WAIT_TIMEOUT) {
5343 Millis -= prd;
5344 }
5345 delete phri; // if it is NULL, harmless
5346 }
5347 v = _Event;
5348 _Event = 0;
5349 // see comment at end of os::PlatformEvent::park() below:
5350 OrderAccess::fence();
5351 // If we encounter a nearly simultanous timeout expiry and unpark()
5352 // we return OS_OK indicating we awoke via unpark().
5353 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5354 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5355 }
5356
5357 void os::PlatformEvent::park() {
5358 // Transitions for _Event:
5359 // -1 => -1 : illegal
5360 // 1 => 0 : pass - return immediately
5361 // 0 => -1 : block; then set _Event to 0 before returning
5362
5363 guarantee(_ParkHandle != NULL, "Invariant");
5364 // Invariant: Only the thread associated with the Event/PlatformEvent
5365 // may call park().
5366 // Consider: use atomic decrement instead of CAS-loop
5367 int v;
5368 for (;;) {
5369 v = _Event;
5370 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
5371 }
5372 guarantee((v == 0) || (v == 1), "invariant");
5373 if (v != 0) return;
5374
5375 // Do this the hard way by blocking ...
5376 // TODO: consider a brief spin here, gated on the success of recent
5377 // spin attempts by this thread.
5378 while (_Event < 0) {
5379 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5380 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5381 }
5382
5383 // Usually we'll find _Event == 0 at this point, but as
5384 // an optional optimization we clear it, just in case can
5385 // multiple unpark() operations drove _Event up to 1.
5386 _Event = 0;
5387 OrderAccess::fence();
5388 guarantee(_Event >= 0, "invariant");
5389 }
5390
5391 void os::PlatformEvent::unpark() {
5392 guarantee(_ParkHandle != NULL, "Invariant");
5393
5394 // Transitions for _Event:
5395 // 0 => 1 : just return
5396 // 1 => 1 : just return
5397 // -1 => either 0 or 1; must signal target thread
5398 // That is, we can safely transition _Event from -1 to either
5399 // 0 or 1.
5400 // See also: "Semaphores in Plan 9" by Mullender & Cox
5401 //
5402 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5403 // that it will take two back-to-back park() calls for the owning
5404 // thread to block. This has the benefit of forcing a spurious return
5405 // from the first park() call after an unpark() call which will help
5406 // shake out uses of park() and unpark() without condition variables.
5407
5408 if (Atomic::xchg(&_Event, 1) >= 0) return;
5409
5410 ::SetEvent(_ParkHandle);
5411 }
5412
5413
5414 // JSR166
5415 // -------------------------------------------------------
5416
5417 // The Windows implementation of Park is very straightforward: Basic
5418 // operations on Win32 Events turn out to have the right semantics to
5419 // use them directly. We opportunistically resuse the event inherited
5420 // from Monitor.
5421
5422 void Parker::park(bool isAbsolute, jlong time) {
5423 guarantee(_ParkEvent != NULL, "invariant");
5424 // First, demultiplex/decode time arguments
5425 if (time < 0) { // don't wait
5426 return;
5427 } else if (time == 0 && !isAbsolute) {
5428 time = INFINITE;
5429 } else if (isAbsolute) {
5430 time -= os::javaTimeMillis(); // convert to relative time
5431 if (time <= 0) { // already elapsed
5432 return;
5433 }
5434 } else { // relative
5435 time /= 1000000; // Must coarsen from nanos to millis
5436 if (time == 0) { // Wait for the minimal time unit if zero
5437 time = 1;
5438 }
5439 }
5440
5441 JavaThread* thread = JavaThread::current();
5442
5443 // Don't wait if interrupted or already triggered
5444 if (thread->is_interrupted(false) ||
5445 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5446 ResetEvent(_ParkEvent);
5447 return;
5448 } else {
5449 ThreadBlockInVM tbivm(thread);
5450 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5451 thread->set_suspend_equivalent();
5452
5453 WaitForSingleObject(_ParkEvent, time);
5454 ResetEvent(_ParkEvent);
5455
5456 // If externally suspended while waiting, re-suspend
5457 if (thread->handle_special_suspend_equivalent_condition()) {
5458 thread->java_suspend_self();
5459 }
5460 }
5461 }
5462
5463 void Parker::unpark() {
5464 guarantee(_ParkEvent != NULL, "invariant");
5465 SetEvent(_ParkEvent);
5466 }
5467
5468 // Platform Monitor implementation
5469
5470 // Must already be locked
5471 int os::PlatformMonitor::wait(jlong millis) {
5472 assert(millis >= 0, "negative timeout");
5473 int ret = OS_TIMEOUT;
5474 int status = SleepConditionVariableCS(&_cond, &_mutex,
5475 millis == 0 ? INFINITE : millis);
5476 if (status != 0) {
5477 ret = OS_OK;
5478 }
5479 #ifndef PRODUCT
5480 else {
5481 DWORD err = GetLastError();
5482 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5483 }
5484 #endif
5485 return ret;
5486 }
5487
5488 // Run the specified command in a separate process. Return its exit value,
5489 // or -1 on failure (e.g. can't create a new process).
5490 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5491 STARTUPINFO si;
5492 PROCESS_INFORMATION pi;
5493 DWORD exit_code;
5494
5495 char * cmd_string;
5496 const char * cmd_prefix = "cmd /C ";
5497 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5498 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5499 if (cmd_string == NULL) {
5500 return -1;
5501 }
5502 cmd_string[0] = '\0';
5503 strcat(cmd_string, cmd_prefix);
5504 strcat(cmd_string, cmd);
5505
5506 // now replace all '\n' with '&'
5507 char * substring = cmd_string;
5508 while ((substring = strchr(substring, '\n')) != NULL) {
5509 substring[0] = '&';
5510 substring++;
5511 }
5512 memset(&si, 0, sizeof(si));
5513 si.cb = sizeof(si);
5514 memset(&pi, 0, sizeof(pi));
5515 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5516 cmd_string, // command line
5517 NULL, // process security attribute
5518 NULL, // thread security attribute
5519 TRUE, // inherits system handles
5520 0, // no creation flags
5521 NULL, // use parent's environment block
5522 NULL, // use parent's starting directory
5523 &si, // (in) startup information
5524 &pi); // (out) process information
5525
5526 if (rslt) {
5527 // Wait until child process exits.
5528 WaitForSingleObject(pi.hProcess, INFINITE);
5529
5530 GetExitCodeProcess(pi.hProcess, &exit_code);
5531
5532 // Close process and thread handles.
5533 CloseHandle(pi.hProcess);
5534 CloseHandle(pi.hThread);
5535 } else {
5536 exit_code = -1;
5537 }
5538
5539 FREE_C_HEAP_ARRAY(char, cmd_string);
5540 return (int)exit_code;
5541 }
5542
5543 bool os::find(address addr, outputStream* st) {
5544 int offset = -1;
5545 bool result = false;
5546 char buf[256];
5547 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5548 st->print(PTR_FORMAT " ", addr);
5549 if (strlen(buf) < sizeof(buf) - 1) {
5550 char* p = strrchr(buf, '\\');
5551 if (p) {
5552 st->print("%s", p + 1);
5553 } else {
5554 st->print("%s", buf);
5555 }
5556 } else {
5557 // The library name is probably truncated. Let's omit the library name.
5558 // See also JDK-8147512.
5559 }
5560 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5561 st->print("::%s + 0x%x", buf, offset);
5562 }
5563 st->cr();
5564 result = true;
5565 }
5566 return result;
5567 }
5568
5569 static jint initSock() {
5570 WSADATA wsadata;
5571
5572 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5573 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5574 ::GetLastError());
5575 return JNI_ERR;
5576 }
5577 return JNI_OK;
5578 }
5579
5580 struct hostent* os::get_host_by_name(char* name) {
5581 return (struct hostent*)gethostbyname(name);
5582 }
5583
5584 int os::socket_close(int fd) {
5585 return ::closesocket(fd);
5586 }
5587
5588 int os::socket(int domain, int type, int protocol) {
5589 return ::socket(domain, type, protocol);
5590 }
5591
5592 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5593 return ::connect(fd, him, len);
5594 }
5595
5596 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5597 return ::recv(fd, buf, (int)nBytes, flags);
5598 }
5599
5600 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5601 return ::send(fd, buf, (int)nBytes, flags);
5602 }
5603
5604 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5605 return ::send(fd, buf, (int)nBytes, flags);
5606 }
5607
5608 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5609 #if defined(IA32)
5610 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5611 #elif defined (AMD64)
5612 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5613 #endif
5614
5615 // returns true if thread could be suspended,
5616 // false otherwise
5617 static bool do_suspend(HANDLE* h) {
5618 if (h != NULL) {
5619 if (SuspendThread(*h) != ~0) {
5620 return true;
5621 }
5622 }
5623 return false;
5624 }
5625
5626 // resume the thread
5627 // calling resume on an active thread is a no-op
5628 static void do_resume(HANDLE* h) {
5629 if (h != NULL) {
5630 ResumeThread(*h);
5631 }
5632 }
5633
5634 // retrieve a suspend/resume context capable handle
5635 // from the tid. Caller validates handle return value.
5636 void get_thread_handle_for_extended_context(HANDLE* h,
5637 OSThread::thread_id_t tid) {
5638 if (h != NULL) {
5639 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5640 }
5641 }
5642
5643 // Thread sampling implementation
5644 //
5645 void os::SuspendedThreadTask::internal_do_task() {
5646 CONTEXT ctxt;
5647 HANDLE h = NULL;
5648
5649 // get context capable handle for thread
5650 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5651
5652 // sanity
5653 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5654 return;
5655 }
5656
5657 // suspend the thread
5658 if (do_suspend(&h)) {
5659 ctxt.ContextFlags = sampling_context_flags;
5660 // get thread context
5661 GetThreadContext(h, &ctxt);
5662 SuspendedThreadTaskContext context(_thread, &ctxt);
5663 // pass context to Thread Sampling impl
5664 do_task(context);
5665 // resume thread
5666 do_resume(&h);
5667 }
5668
5669 // close handle
5670 CloseHandle(h);
5671 }
5672
5673 bool os::start_debugging(char *buf, int buflen) {
5674 int len = (int)strlen(buf);
5675 char *p = &buf[len];
5676
5677 jio_snprintf(p, buflen-len,
5678 "\n\n"
5679 "Do you want to debug the problem?\n\n"
5680 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5681 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5682 "Otherwise, select 'No' to abort...",
5683 os::current_process_id(), os::current_thread_id());
5684
5685 bool yes = os::message_box("Unexpected Error", buf);
5686
5687 if (yes) {
5688 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5689 // exception. If VM is running inside a debugger, the debugger will
5690 // catch the exception. Otherwise, the breakpoint exception will reach
5691 // the default windows exception handler, which can spawn a debugger and
5692 // automatically attach to the dying VM.
5693 os::breakpoint();
5694 yes = false;
5695 }
5696 return yes;
5697 }
5698
5699 void* os::get_default_process_handle() {
5700 return (void*)GetModuleHandle(NULL);
5701 }
5702
5703 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5704 // which is used to find statically linked in agents.
5705 // Additionally for windows, takes into account __stdcall names.
5706 // Parameters:
5707 // sym_name: Symbol in library we are looking for
5708 // lib_name: Name of library to look in, NULL for shared libs.
5709 // is_absolute_path == true if lib_name is absolute path to agent
5710 // such as "C:/a/b/L.dll"
5711 // == false if only the base name of the library is passed in
5712 // such as "L"
5713 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5714 bool is_absolute_path) {
5715 char *agent_entry_name;
5716 size_t len;
5717 size_t name_len;
5718 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5719 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5720 const char *start;
5721
5722 if (lib_name != NULL) {
5723 len = name_len = strlen(lib_name);
5724 if (is_absolute_path) {
5725 // Need to strip path, prefix and suffix
5726 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5727 lib_name = ++start;
5728 } else {
5729 // Need to check for drive prefix
5730 if ((start = strchr(lib_name, ':')) != NULL) {
5731 lib_name = ++start;
5732 }
5733 }
5734 if (len <= (prefix_len + suffix_len)) {
5735 return NULL;
5736 }
5737 lib_name += prefix_len;
5738 name_len = strlen(lib_name) - suffix_len;
5739 }
5740 }
5741 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5742 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5743 if (agent_entry_name == NULL) {
5744 return NULL;
5745 }
5746 if (lib_name != NULL) {
5747 const char *p = strrchr(sym_name, '@');
5748 if (p != NULL && p != sym_name) {
5749 // sym_name == _Agent_OnLoad@XX
5750 strncpy(agent_entry_name, sym_name, (p - sym_name));
5751 agent_entry_name[(p-sym_name)] = '\0';
5752 // agent_entry_name == _Agent_OnLoad
5753 strcat(agent_entry_name, "_");
5754 strncat(agent_entry_name, lib_name, name_len);
5755 strcat(agent_entry_name, p);
5756 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5757 } else {
5758 strcpy(agent_entry_name, sym_name);
5759 strcat(agent_entry_name, "_");
5760 strncat(agent_entry_name, lib_name, name_len);
5761 }
5762 } else {
5763 strcpy(agent_entry_name, sym_name);
5764 }
5765 return agent_entry_name;
5766 }
5767
5768 #ifndef PRODUCT
5769
5770 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5771 // contiguous memory block at a particular address.
5772 // The test first tries to find a good approximate address to allocate at by using the same
5773 // method to allocate some memory at any address. The test then tries to allocate memory in
5774 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5775 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5776 // the previously allocated memory is available for allocation. The only actual failure
5777 // that is reported is when the test tries to allocate at a particular location but gets a
5778 // different valid one. A NULL return value at this point is not considered an error but may
5779 // be legitimate.
5780 void TestReserveMemorySpecial_test() {
5781 if (!UseLargePages) {
5782 return;
5783 }
5784 // save current value of globals
5785 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5786 bool old_use_numa_interleaving = UseNUMAInterleaving;
5787
5788 // set globals to make sure we hit the correct code path
5789 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5790
5791 // do an allocation at an address selected by the OS to get a good one.
5792 const size_t large_allocation_size = os::large_page_size() * 4;
5793 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5794 if (result == NULL) {
5795 } else {
5796 os::release_memory_special(result, large_allocation_size);
5797
5798 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5799 // we managed to get it once.
5800 const size_t expected_allocation_size = os::large_page_size();
5801 char* expected_location = result + os::large_page_size();
5802 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5803 if (actual_location == NULL) {
5804 } else {
5805 // release memory
5806 os::release_memory_special(actual_location, expected_allocation_size);
5807 // only now check, after releasing any memory to avoid any leaks.
5808 assert(actual_location == expected_location,
5809 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5810 expected_location, expected_allocation_size, actual_location);
5811 }
5812 }
5813
5814 // restore globals
5815 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5816 UseNUMAInterleaving = old_use_numa_interleaving;
5817 }
5818 #endif // PRODUCT
5819
5820 /*
5821 All the defined signal names for Windows.
5822
5823 NOTE that not all of these names are accepted by FindSignal!
5824
5825 For various reasons some of these may be rejected at runtime.
5826
5827 Here are the names currently accepted by a user of sun.misc.Signal with
5828 1.4.1 (ignoring potential interaction with use of chaining, etc):
5829
5830 (LIST TBD)
5831
5832 */
5833 int os::get_signal_number(const char* name) {
5834 static const struct {
5835 const char* name;
5836 int number;
5837 } siglabels [] =
5838 // derived from version 6.0 VC98/include/signal.h
5839 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5840 "FPE", SIGFPE, // floating point exception
5841 "SEGV", SIGSEGV, // segment violation
5842 "INT", SIGINT, // interrupt
5843 "TERM", SIGTERM, // software term signal from kill
5844 "BREAK", SIGBREAK, // Ctrl-Break sequence
5845 "ILL", SIGILL}; // illegal instruction
5846 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5847 if (strcmp(name, siglabels[i].name) == 0) {
5848 return siglabels[i].number;
5849 }
5850 }
5851 return -1;
5852 }
5853
5854 // Fast current thread access
5855
5856 int os::win32::_thread_ptr_offset = 0;
5857
5858 static void call_wrapper_dummy() {}
5859
5860 // We need to call the os_exception_wrapper once so that it sets
5861 // up the offset from FS of the thread pointer.
5862 void os::win32::initialize_thread_ptr_offset() {
5863 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5864 NULL, methodHandle(), NULL, NULL);
5865 }
5866
5867 bool os::supports_map_sync() {
5868 return false;
5869 }