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