1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84
85 #include <windows.h>
86 #include <sys/types.h>
87 #include <sys/stat.h>
88 #include <sys/timeb.h>
89 #include <objidl.h>
90 #include <shlobj.h>
91
92 #include <malloc.h>
93 #include <signal.h>
94 #include <direct.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <io.h>
98 #include <process.h> // For _beginthreadex(), _endthreadex()
99 #include <imagehlp.h> // For os::dll_address_to_function_name
100 // for enumerating dll libraries
101 #include <vdmdbg.h>
102 #include <psapi.h>
103 #include <mmsystem.h>
104 #include <winsock2.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(-1)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _M_AMD64
124 #define __CPU__ amd64
125 #else
126 #define __CPU__ i486
127 #endif
128
129 #if INCLUDE_AOT
130 PVOID topLevelVectoredExceptionHandler = NULL;
131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
132 #endif
133
134 // save DLL module handle, used by GetModuleFileName
135
136 HINSTANCE vm_lib_handle;
137
138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
139 switch (reason) {
140 case DLL_PROCESS_ATTACH:
141 vm_lib_handle = hinst;
142 if (ForceTimeHighResolution) {
143 timeBeginPeriod(1L);
144 }
145 WindowsDbgHelp::pre_initialize();
146 SymbolEngine::pre_initialize();
147 break;
148 case DLL_PROCESS_DETACH:
149 if (ForceTimeHighResolution) {
150 timeEndPeriod(1L);
151 }
152 #if INCLUDE_AOT
153 if (topLevelVectoredExceptionHandler != NULL) {
154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
155 topLevelVectoredExceptionHandler = NULL;
156 }
157 #endif
158 break;
159 default:
160 break;
161 }
162 return true;
163 }
164
165 static inline double fileTimeAsDouble(FILETIME* time) {
166 const double high = (double) ((unsigned int) ~0);
167 const double split = 10000000.0;
168 double result = (time->dwLowDateTime / split) +
169 time->dwHighDateTime * (high/split);
170 return result;
171 }
172
173 // Implementation of os
174
175 bool os::unsetenv(const char* name) {
176 assert(name != NULL, "Null pointer");
177 return (SetEnvironmentVariable(name, NULL) == TRUE);
178 }
179
180 // No setuid programs under Windows.
181 bool os::have_special_privileges() {
182 return false;
183 }
184
185
186 // This method is a periodic task to check for misbehaving JNI applications
187 // under CheckJNI, we can add any periodic checks here.
188 // For Windows at the moment does nothing
189 void os::run_periodic_checks() {
190 return;
191 }
192
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197
198 void os::init_system_properties_values() {
199 // sysclasspath, java_home, dll_dir
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 const char *bin = "\\bin";
205 char home_dir[MAX_PATH + 1];
206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
207
208 if (alt_home_dir != NULL) {
209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
210 home_dir[MAX_PATH] = '\0';
211 } else {
212 os::jvm_path(home_dir, sizeof(home_dir));
213 // Found the full path to jvm.dll.
214 // Now cut the path to <java_home>/jre if we can.
215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \{client|server}
219 pslash = strrchr(home_dir, '\\');
220 if (pslash != NULL) {
221 *pslash = '\0'; // get rid of \bin
222 }
223 }
224 }
225
226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
227 if (home_path == NULL) {
228 return;
229 }
230 strcpy(home_path, home_dir);
231 Arguments::set_java_home(home_path);
232 FREE_C_HEAP_ARRAY(char, home_path);
233
234 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
235 mtInternal);
236 if (dll_path == NULL) {
237 return;
238 }
239 strcpy(dll_path, home_dir);
240 strcat(dll_path, bin);
241 Arguments::set_dll_dir(dll_path);
242 FREE_C_HEAP_ARRAY(char, dll_path);
243
244 if (!set_boot_path('\\', ';')) {
245 vm_exit_during_initialization("Failed setting boot class path.", NULL);
246 }
247 }
248
249 // library_path
250 #define EXT_DIR "\\lib\\ext"
251 #define BIN_DIR "\\bin"
252 #define PACKAGE_DIR "\\Sun\\Java"
253 {
254 // Win32 library search order (See the documentation for LoadLibrary):
255 //
256 // 1. The directory from which application is loaded.
257 // 2. The system wide Java Extensions directory (Java only)
258 // 3. System directory (GetSystemDirectory)
259 // 4. Windows directory (GetWindowsDirectory)
260 // 5. The PATH environment variable
261 // 6. The current directory
262
263 char *library_path;
264 char tmp[MAX_PATH];
265 char *path_str = ::getenv("PATH");
266
267 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
268 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
269
270 library_path[0] = '\0';
271
272 GetModuleFileName(NULL, tmp, sizeof(tmp));
273 *(strrchr(tmp, '\\')) = '\0';
274 strcat(library_path, tmp);
275
276 GetWindowsDirectory(tmp, sizeof(tmp));
277 strcat(library_path, ";");
278 strcat(library_path, tmp);
279 strcat(library_path, PACKAGE_DIR BIN_DIR);
280
281 GetSystemDirectory(tmp, sizeof(tmp));
282 strcat(library_path, ";");
283 strcat(library_path, tmp);
284
285 GetWindowsDirectory(tmp, sizeof(tmp));
286 strcat(library_path, ";");
287 strcat(library_path, tmp);
288
289 if (path_str) {
290 strcat(library_path, ";");
291 strcat(library_path, path_str);
292 }
293
294 strcat(library_path, ";.");
295
296 Arguments::set_library_path(library_path);
297 FREE_C_HEAP_ARRAY(char, library_path);
298 }
299
300 // Default extensions directory
301 {
302 char path[MAX_PATH];
303 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
304 GetWindowsDirectory(path, MAX_PATH);
305 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
306 path, PACKAGE_DIR, EXT_DIR);
307 Arguments::set_ext_dirs(buf);
308 }
309 #undef EXT_DIR
310 #undef BIN_DIR
311 #undef PACKAGE_DIR
312
313 #ifndef _WIN64
314 // set our UnhandledExceptionFilter and save any previous one
315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
316 #endif
317
318 // Done
319 return;
320 }
321
322 void os::breakpoint() {
323 DebugBreak();
324 }
325
326 // Invoked from the BREAKPOINT Macro
327 extern "C" void breakpoint() {
328 os::breakpoint();
329 }
330
331 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
332 // So far, this method is only used by Native Memory Tracking, which is
333 // only supported on Windows XP or later.
334 //
335 int os::get_native_stack(address* stack, int frames, int toSkip) {
336 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
337 for (int index = captured; index < frames; index ++) {
338 stack[index] = NULL;
339 }
340 return captured;
341 }
342
343
344 // os::current_stack_base()
345 //
346 // Returns the base of the stack, which is the stack's
347 // starting address. This function must be called
348 // while running on the stack of the thread being queried.
349
350 address os::current_stack_base() {
351 MEMORY_BASIC_INFORMATION minfo;
352 address stack_bottom;
353 size_t stack_size;
354
355 VirtualQuery(&minfo, &minfo, sizeof(minfo));
356 stack_bottom = (address)minfo.AllocationBase;
357 stack_size = minfo.RegionSize;
358
359 // Add up the sizes of all the regions with the same
360 // AllocationBase.
361 while (1) {
362 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
363 if (stack_bottom == (address)minfo.AllocationBase) {
364 stack_size += minfo.RegionSize;
365 } else {
366 break;
367 }
368 }
369 return stack_bottom + stack_size;
370 }
371
372 size_t os::current_stack_size() {
373 size_t sz;
374 MEMORY_BASIC_INFORMATION minfo;
375 VirtualQuery(&minfo, &minfo, sizeof(minfo));
376 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
377 return sz;
378 }
379
380 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
381 MEMORY_BASIC_INFORMATION minfo;
382 committed_start = NULL;
383 committed_size = 0;
384 address top = start + size;
385 const address start_addr = start;
386 while (start < top) {
387 VirtualQuery(start, &minfo, sizeof(minfo));
388 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
389 if (committed_start != NULL) {
390 break;
391 }
392 } else { // committed
393 if (committed_start == NULL) {
394 committed_start = start;
395 }
396 size_t offset = start - (address)minfo.BaseAddress;
397 committed_size += minfo.RegionSize - offset;
398 }
399 start = (address)minfo.BaseAddress + minfo.RegionSize;
400 }
401
402 if (committed_start == NULL) {
403 assert(committed_size == 0, "Sanity");
404 return false;
405 } else {
406 assert(committed_start >= start_addr && committed_start < top, "Out of range");
407 // current region may go beyond the limit, trim to the limit
408 committed_size = MIN2(committed_size, size_t(top - committed_start));
409 return true;
410 }
411 }
412
413 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
414 const struct tm* time_struct_ptr = localtime(clock);
415 if (time_struct_ptr != NULL) {
416 *res = *time_struct_ptr;
417 return res;
418 }
419 return NULL;
420 }
421
422 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
423 const struct tm* time_struct_ptr = gmtime(clock);
424 if (time_struct_ptr != NULL) {
425 *res = *time_struct_ptr;
426 return res;
427 }
428 return NULL;
429 }
430
431 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
432
433 // Thread start routine for all newly created threads
434 static unsigned __stdcall thread_native_entry(Thread* thread) {
435
436 thread->record_stack_base_and_size();
437
438 // Try to randomize the cache line index of hot stack frames.
439 // This helps when threads of the same stack traces evict each other's
440 // cache lines. The threads can be either from the same JVM instance, or
441 // from different JVM instances. The benefit is especially true for
442 // processors with hyperthreading technology.
443 static int counter = 0;
444 int pid = os::current_process_id();
445 _alloca(((pid ^ counter++) & 7) * 128);
446
447 thread->initialize_thread_current();
448
449 OSThread* osthr = thread->osthread();
450 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
451
452 if (UseNUMA) {
453 int lgrp_id = os::numa_get_group_id();
454 if (lgrp_id != -1) {
455 thread->set_lgrp_id(lgrp_id);
456 }
457 }
458
459 // Diagnostic code to investigate JDK-6573254
460 int res = 30115; // non-java thread
461 if (thread->is_Java_thread()) {
462 res = 20115; // java thread
463 }
464
465 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
466
467 // Install a win32 structured exception handler around every thread created
468 // by VM, so VM can generate error dump when an exception occurred in non-
469 // Java thread (e.g. VM thread).
470 __try {
471 thread->call_run();
472 } __except(topLevelExceptionFilter(
473 (_EXCEPTION_POINTERS*)_exception_info())) {
474 // Nothing to do.
475 }
476
477 // Note: at this point the thread object may already have deleted itself.
478 // Do not dereference it from here on out.
479
480 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
481
482 // One less thread is executing
483 // When the VMThread gets here, the main thread may have already exited
484 // which frees the CodeHeap containing the Atomic::add code
485 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
486 Atomic::dec(&os::win32::_os_thread_count);
487 }
488
489 // Thread must not return from exit_process_or_thread(), but if it does,
490 // let it proceed to exit normally
491 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
492 }
493
494 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
495 int thread_id) {
496 // Allocate the OSThread object
497 OSThread* osthread = new OSThread(NULL, NULL);
498 if (osthread == NULL) return NULL;
499
500 // Initialize support for Java interrupts
501 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
502 if (interrupt_event == NULL) {
503 delete osthread;
504 return NULL;
505 }
506 osthread->set_interrupt_event(interrupt_event);
507
508 // Store info on the Win32 thread into the OSThread
509 osthread->set_thread_handle(thread_handle);
510 osthread->set_thread_id(thread_id);
511
512 if (UseNUMA) {
513 int lgrp_id = os::numa_get_group_id();
514 if (lgrp_id != -1) {
515 thread->set_lgrp_id(lgrp_id);
516 }
517 }
518
519 // Initial thread state is INITIALIZED, not SUSPENDED
520 osthread->set_state(INITIALIZED);
521
522 return osthread;
523 }
524
525
526 bool os::create_attached_thread(JavaThread* thread) {
527 #ifdef ASSERT
528 thread->verify_not_published();
529 #endif
530 HANDLE thread_h;
531 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
532 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
533 fatal("DuplicateHandle failed\n");
534 }
535 OSThread* osthread = create_os_thread(thread, thread_h,
536 (int)current_thread_id());
537 if (osthread == NULL) {
538 return false;
539 }
540
541 // Initial thread state is RUNNABLE
542 osthread->set_state(RUNNABLE);
543
544 thread->set_osthread(osthread);
545
546 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
547 os::current_thread_id());
548
549 return true;
550 }
551
552 bool os::create_main_thread(JavaThread* thread) {
553 #ifdef ASSERT
554 thread->verify_not_published();
555 #endif
556 if (_starting_thread == NULL) {
557 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
558 if (_starting_thread == NULL) {
559 return false;
560 }
561 }
562
563 // The primordial thread is runnable from the start)
564 _starting_thread->set_state(RUNNABLE);
565
566 thread->set_osthread(_starting_thread);
567 return true;
568 }
569
570 // Helper function to trace _beginthreadex attributes,
571 // similar to os::Posix::describe_pthread_attr()
572 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
573 size_t stacksize, unsigned initflag) {
574 stringStream ss(buf, buflen);
575 if (stacksize == 0) {
576 ss.print("stacksize: default, ");
577 } else {
578 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
579 }
580 ss.print("flags: ");
581 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
582 #define ALL(X) \
583 X(CREATE_SUSPENDED) \
584 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
585 ALL(PRINT_FLAG)
586 #undef ALL
587 #undef PRINT_FLAG
588 return buf;
589 }
590
591 // Allocate and initialize a new OSThread
592 bool os::create_thread(Thread* thread, ThreadType thr_type,
593 size_t stack_size) {
594 unsigned thread_id;
595
596 // Allocate the OSThread object
597 OSThread* osthread = new OSThread(NULL, NULL);
598 if (osthread == NULL) {
599 return false;
600 }
601
602 // Initialize support for Java interrupts
603 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
604 if (interrupt_event == NULL) {
605 delete osthread;
606 return false;
607 }
608 osthread->set_interrupt_event(interrupt_event);
609 osthread->set_interrupted(false);
610
611 thread->set_osthread(osthread);
612
613 if (stack_size == 0) {
614 switch (thr_type) {
615 case os::java_thread:
616 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
617 if (JavaThread::stack_size_at_create() > 0) {
618 stack_size = JavaThread::stack_size_at_create();
619 }
620 break;
621 case os::compiler_thread:
622 if (CompilerThreadStackSize > 0) {
623 stack_size = (size_t)(CompilerThreadStackSize * K);
624 break;
625 } // else fall through:
626 // use VMThreadStackSize if CompilerThreadStackSize is not defined
627 case os::vm_thread:
628 case os::pgc_thread:
629 case os::cgc_thread:
630 case os::watcher_thread:
631 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
632 break;
633 }
634 }
635
636 // Create the Win32 thread
637 //
638 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
639 // does not specify stack size. Instead, it specifies the size of
640 // initially committed space. The stack size is determined by
641 // PE header in the executable. If the committed "stack_size" is larger
642 // than default value in the PE header, the stack is rounded up to the
643 // nearest multiple of 1MB. For example if the launcher has default
644 // stack size of 320k, specifying any size less than 320k does not
645 // affect the actual stack size at all, it only affects the initial
646 // commitment. On the other hand, specifying 'stack_size' larger than
647 // default value may cause significant increase in memory usage, because
648 // not only the stack space will be rounded up to MB, but also the
649 // entire space is committed upfront.
650 //
651 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
652 // for CreateThread() that can treat 'stack_size' as stack size. However we
653 // are not supposed to call CreateThread() directly according to MSDN
654 // document because JVM uses C runtime library. The good news is that the
655 // flag appears to work with _beginthredex() as well.
656
657 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
658 HANDLE thread_handle =
659 (HANDLE)_beginthreadex(NULL,
660 (unsigned)stack_size,
661 (unsigned (__stdcall *)(void*)) thread_native_entry,
662 thread,
663 initflag,
664 &thread_id);
665
666 char buf[64];
667 if (thread_handle != NULL) {
668 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
669 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
670 } else {
671 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
672 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
673 // Log some OS information which might explain why creating the thread failed.
674 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
675 LogStream st(Log(os, thread)::info());
676 os::print_memory_info(&st);
677 }
678
679 if (thread_handle == NULL) {
680 // Need to clean up stuff we've allocated so far
681 CloseHandle(osthread->interrupt_event());
682 thread->set_osthread(NULL);
683 delete osthread;
684 return false;
685 }
686
687 Atomic::inc(&os::win32::_os_thread_count);
688
689 // Store info on the Win32 thread into the OSThread
690 osthread->set_thread_handle(thread_handle);
691 osthread->set_thread_id(thread_id);
692
693 // Initial thread state is INITIALIZED, not SUSPENDED
694 osthread->set_state(INITIALIZED);
695
696 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
697 return true;
698 }
699
700
701 // Free Win32 resources related to the OSThread
702 void os::free_thread(OSThread* osthread) {
703 assert(osthread != NULL, "osthread not set");
704
705 // We are told to free resources of the argument thread,
706 // but we can only really operate on the current thread.
707 assert(Thread::current()->osthread() == osthread,
708 "os::free_thread but not current thread");
709
710 CloseHandle(osthread->thread_handle());
711 CloseHandle(osthread->interrupt_event());
712 delete osthread;
713 }
714
715 static jlong first_filetime;
716 static jlong initial_performance_count;
717 static jlong performance_frequency;
718
719
720 jlong as_long(LARGE_INTEGER x) {
721 jlong result = 0; // initialization to avoid warning
722 set_high(&result, x.HighPart);
723 set_low(&result, x.LowPart);
724 return result;
725 }
726
727
728 jlong os::elapsed_counter() {
729 LARGE_INTEGER count;
730 QueryPerformanceCounter(&count);
731 return as_long(count) - initial_performance_count;
732 }
733
734
735 jlong os::elapsed_frequency() {
736 return performance_frequency;
737 }
738
739
740 julong os::available_memory() {
741 return win32::available_memory();
742 }
743
744 julong os::win32::available_memory() {
745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
746 // value if total memory is larger than 4GB
747 MEMORYSTATUSEX ms;
748 ms.dwLength = sizeof(ms);
749 GlobalMemoryStatusEx(&ms);
750
751 return (julong)ms.ullAvailPhys;
752 }
753
754 julong os::physical_memory() {
755 return win32::physical_memory();
756 }
757
758 bool os::has_allocatable_memory_limit(julong* limit) {
759 MEMORYSTATUSEX ms;
760 ms.dwLength = sizeof(ms);
761 GlobalMemoryStatusEx(&ms);
762 #ifdef _LP64
763 *limit = (julong)ms.ullAvailVirtual;
764 return true;
765 #else
766 // Limit to 1400m because of the 2gb address space wall
767 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
768 return true;
769 #endif
770 }
771
772 int os::active_processor_count() {
773 // User has overridden the number of active processors
774 if (ActiveProcessorCount > 0) {
775 log_trace(os)("active_processor_count: "
776 "active processor count set by user : %d",
777 ActiveProcessorCount);
778 return ActiveProcessorCount;
779 }
780
781 DWORD_PTR lpProcessAffinityMask = 0;
782 DWORD_PTR lpSystemAffinityMask = 0;
783 int proc_count = processor_count();
784 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
785 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
786 // Nof active processors is number of bits in process affinity mask
787 int bitcount = 0;
788 while (lpProcessAffinityMask != 0) {
789 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
790 bitcount++;
791 }
792 return bitcount;
793 } else {
794 return proc_count;
795 }
796 }
797
798 void os::set_native_thread_name(const char *name) {
799
800 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
801 //
802 // Note that unfortunately this only works if the process
803 // is already attached to a debugger; debugger must observe
804 // the exception below to show the correct name.
805
806 // If there is no debugger attached skip raising the exception
807 if (!IsDebuggerPresent()) {
808 return;
809 }
810
811 const DWORD MS_VC_EXCEPTION = 0x406D1388;
812 struct {
813 DWORD dwType; // must be 0x1000
814 LPCSTR szName; // pointer to name (in user addr space)
815 DWORD dwThreadID; // thread ID (-1=caller thread)
816 DWORD dwFlags; // reserved for future use, must be zero
817 } info;
818
819 info.dwType = 0x1000;
820 info.szName = name;
821 info.dwThreadID = -1;
822 info.dwFlags = 0;
823
824 __try {
825 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
826 } __except(EXCEPTION_EXECUTE_HANDLER) {}
827 }
828
829 bool os::distribute_processes(uint length, uint* distribution) {
830 // Not yet implemented.
831 return false;
832 }
833
834 bool os::bind_to_processor(uint processor_id) {
835 // Not yet implemented.
836 return false;
837 }
838
839 void os::win32::initialize_performance_counter() {
840 LARGE_INTEGER count;
841 QueryPerformanceFrequency(&count);
842 performance_frequency = as_long(count);
843 QueryPerformanceCounter(&count);
844 initial_performance_count = as_long(count);
845 }
846
847
848 double os::elapsedTime() {
849 return (double) elapsed_counter() / (double) elapsed_frequency();
850 }
851
852
853 // Windows format:
854 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
855 // Java format:
856 // Java standards require the number of milliseconds since 1/1/1970
857
858 // Constant offset - calculated using offset()
859 static jlong _offset = 116444736000000000;
860 // Fake time counter for reproducible results when debugging
861 static jlong fake_time = 0;
862
863 #ifdef ASSERT
864 // Just to be safe, recalculate the offset in debug mode
865 static jlong _calculated_offset = 0;
866 static int _has_calculated_offset = 0;
867
868 jlong offset() {
869 if (_has_calculated_offset) return _calculated_offset;
870 SYSTEMTIME java_origin;
871 java_origin.wYear = 1970;
872 java_origin.wMonth = 1;
873 java_origin.wDayOfWeek = 0; // ignored
874 java_origin.wDay = 1;
875 java_origin.wHour = 0;
876 java_origin.wMinute = 0;
877 java_origin.wSecond = 0;
878 java_origin.wMilliseconds = 0;
879 FILETIME jot;
880 if (!SystemTimeToFileTime(&java_origin, &jot)) {
881 fatal("Error = %d\nWindows error", GetLastError());
882 }
883 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
884 _has_calculated_offset = 1;
885 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
886 return _calculated_offset;
887 }
888 #else
889 jlong offset() {
890 return _offset;
891 }
892 #endif
893
894 jlong windows_to_java_time(FILETIME wt) {
895 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
896 return (a - offset()) / 10000;
897 }
898
899 // Returns time ticks in (10th of micro seconds)
900 jlong windows_to_time_ticks(FILETIME wt) {
901 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
902 return (a - offset());
903 }
904
905 FILETIME java_to_windows_time(jlong l) {
906 jlong a = (l * 10000) + offset();
907 FILETIME result;
908 result.dwHighDateTime = high(a);
909 result.dwLowDateTime = low(a);
910 return result;
911 }
912
913 bool os::supports_vtime() { return true; }
914 bool os::enable_vtime() { return false; }
915 bool os::vtime_enabled() { return false; }
916
917 double os::elapsedVTime() {
918 FILETIME created;
919 FILETIME exited;
920 FILETIME kernel;
921 FILETIME user;
922 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
923 // the resolution of windows_to_java_time() should be sufficient (ms)
924 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
925 } else {
926 return elapsedTime();
927 }
928 }
929
930 jlong os::javaTimeMillis() {
931 FILETIME wt;
932 GetSystemTimeAsFileTime(&wt);
933 return windows_to_java_time(wt);
934 }
935
936 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
937 FILETIME wt;
938 GetSystemTimeAsFileTime(&wt);
939 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
940 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
941 seconds = secs;
942 nanos = jlong(ticks - (secs*10000000)) * 100;
943 }
944
945 jlong os::javaTimeNanos() {
946 LARGE_INTEGER current_count;
947 QueryPerformanceCounter(¤t_count);
948 double current = as_long(current_count);
949 double freq = performance_frequency;
950 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
951 return time;
952 }
953
954 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
955 jlong freq = performance_frequency;
956 if (freq < NANOSECS_PER_SEC) {
957 // the performance counter is 64 bits and we will
958 // be multiplying it -- so no wrap in 64 bits
959 info_ptr->max_value = ALL_64_BITS;
960 } else if (freq > NANOSECS_PER_SEC) {
961 // use the max value the counter can reach to
962 // determine the max value which could be returned
963 julong max_counter = (julong)ALL_64_BITS;
964 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
965 } else {
966 // the performance counter is 64 bits and we will
967 // be using it directly -- so no wrap in 64 bits
968 info_ptr->max_value = ALL_64_BITS;
969 }
970
971 // using a counter, so no skipping
972 info_ptr->may_skip_backward = false;
973 info_ptr->may_skip_forward = false;
974
975 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
976 }
977
978 char* os::local_time_string(char *buf, size_t buflen) {
979 SYSTEMTIME st;
980 GetLocalTime(&st);
981 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
982 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
983 return buf;
984 }
985
986 bool os::getTimesSecs(double* process_real_time,
987 double* process_user_time,
988 double* process_system_time) {
989 HANDLE h_process = GetCurrentProcess();
990 FILETIME create_time, exit_time, kernel_time, user_time;
991 BOOL result = GetProcessTimes(h_process,
992 &create_time,
993 &exit_time,
994 &kernel_time,
995 &user_time);
996 if (result != 0) {
997 FILETIME wt;
998 GetSystemTimeAsFileTime(&wt);
999 jlong rtc_millis = windows_to_java_time(wt);
1000 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
1001 *process_user_time =
1002 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1003 *process_system_time =
1004 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1005 return true;
1006 } else {
1007 return false;
1008 }
1009 }
1010
1011 void os::shutdown() {
1012 // allow PerfMemory to attempt cleanup of any persistent resources
1013 perfMemory_exit();
1014
1015 // flush buffered output, finish log files
1016 ostream_abort();
1017
1018 // Check for abort hook
1019 abort_hook_t abort_hook = Arguments::abort_hook();
1020 if (abort_hook != NULL) {
1021 abort_hook();
1022 }
1023 }
1024
1025
1026 static HANDLE dumpFile = NULL;
1027
1028 // Check if dump file can be created.
1029 void os::check_dump_limit(char* buffer, size_t buffsz) {
1030 bool status = true;
1031 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1032 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1033 status = false;
1034 }
1035
1036 #ifndef ASSERT
1037 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1038 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1039 status = false;
1040 }
1041 #endif
1042
1043 if (status) {
1044 const char* cwd = get_current_directory(NULL, 0);
1045 int pid = current_process_id();
1046 if (cwd != NULL) {
1047 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1048 } else {
1049 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1050 }
1051
1052 if (dumpFile == NULL &&
1053 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1054 == INVALID_HANDLE_VALUE) {
1055 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1056 status = false;
1057 }
1058 }
1059 VMError::record_coredump_status(buffer, status);
1060 }
1061
1062 void os::abort(bool dump_core, void* siginfo, const void* context) {
1063 EXCEPTION_POINTERS ep;
1064 MINIDUMP_EXCEPTION_INFORMATION mei;
1065 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1066
1067 HANDLE hProcess = GetCurrentProcess();
1068 DWORD processId = GetCurrentProcessId();
1069 MINIDUMP_TYPE dumpType;
1070
1071 shutdown();
1072 if (!dump_core || dumpFile == NULL) {
1073 if (dumpFile != NULL) {
1074 CloseHandle(dumpFile);
1075 }
1076 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1077 }
1078
1079 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1080 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1081
1082 if (siginfo != NULL && context != NULL) {
1083 ep.ContextRecord = (PCONTEXT) context;
1084 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1085
1086 mei.ThreadId = GetCurrentThreadId();
1087 mei.ExceptionPointers = &ep;
1088 pmei = &mei;
1089 } else {
1090 pmei = NULL;
1091 }
1092
1093 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1094 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1095 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1096 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1097 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1098 }
1099 CloseHandle(dumpFile);
1100 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1101 }
1102
1103 // Die immediately, no exit hook, no abort hook, no cleanup.
1104 void os::die() {
1105 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1106 }
1107
1108 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1109 // * dirent_md.c 1.15 00/02/02
1110 //
1111 // The declarations for DIR and struct dirent are in jvm_win32.h.
1112
1113 // Caller must have already run dirname through JVM_NativePath, which removes
1114 // duplicate slashes and converts all instances of '/' into '\\'.
1115
1116 DIR * os::opendir(const char *dirname) {
1117 assert(dirname != NULL, "just checking"); // hotspot change
1118 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1119 DWORD fattr; // hotspot change
1120 char alt_dirname[4] = { 0, 0, 0, 0 };
1121
1122 if (dirp == 0) {
1123 errno = ENOMEM;
1124 return 0;
1125 }
1126
1127 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1128 // as a directory in FindFirstFile(). We detect this case here and
1129 // prepend the current drive name.
1130 //
1131 if (dirname[1] == '\0' && dirname[0] == '\\') {
1132 alt_dirname[0] = _getdrive() + 'A' - 1;
1133 alt_dirname[1] = ':';
1134 alt_dirname[2] = '\\';
1135 alt_dirname[3] = '\0';
1136 dirname = alt_dirname;
1137 }
1138
1139 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1140 if (dirp->path == 0) {
1141 free(dirp);
1142 errno = ENOMEM;
1143 return 0;
1144 }
1145 strcpy(dirp->path, dirname);
1146
1147 fattr = GetFileAttributes(dirp->path);
1148 if (fattr == 0xffffffff) {
1149 free(dirp->path);
1150 free(dirp);
1151 errno = ENOENT;
1152 return 0;
1153 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1154 free(dirp->path);
1155 free(dirp);
1156 errno = ENOTDIR;
1157 return 0;
1158 }
1159
1160 // Append "*.*", or possibly "\\*.*", to path
1161 if (dirp->path[1] == ':' &&
1162 (dirp->path[2] == '\0' ||
1163 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1164 // No '\\' needed for cases like "Z:" or "Z:\"
1165 strcat(dirp->path, "*.*");
1166 } else {
1167 strcat(dirp->path, "\\*.*");
1168 }
1169
1170 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1171 if (dirp->handle == INVALID_HANDLE_VALUE) {
1172 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1173 free(dirp->path);
1174 free(dirp);
1175 errno = EACCES;
1176 return 0;
1177 }
1178 }
1179 return dirp;
1180 }
1181
1182 struct dirent * os::readdir(DIR *dirp) {
1183 assert(dirp != NULL, "just checking"); // hotspot change
1184 if (dirp->handle == INVALID_HANDLE_VALUE) {
1185 return NULL;
1186 }
1187
1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1189
1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1191 if (GetLastError() == ERROR_INVALID_HANDLE) {
1192 errno = EBADF;
1193 return NULL;
1194 }
1195 FindClose(dirp->handle);
1196 dirp->handle = INVALID_HANDLE_VALUE;
1197 }
1198
1199 return &dirp->dirent;
1200 }
1201
1202 int os::closedir(DIR *dirp) {
1203 assert(dirp != NULL, "just checking"); // hotspot change
1204 if (dirp->handle != INVALID_HANDLE_VALUE) {
1205 if (!FindClose(dirp->handle)) {
1206 errno = EBADF;
1207 return -1;
1208 }
1209 dirp->handle = INVALID_HANDLE_VALUE;
1210 }
1211 free(dirp->path);
1212 free(dirp);
1213 return 0;
1214 }
1215
1216 // This must be hard coded because it's the system's temporary
1217 // directory not the java application's temp directory, ala java.io.tmpdir.
1218 const char* os::get_temp_directory() {
1219 static char path_buf[MAX_PATH];
1220 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1221 return path_buf;
1222 } else {
1223 path_buf[0] = '\0';
1224 return path_buf;
1225 }
1226 }
1227
1228 // Needs to be in os specific directory because windows requires another
1229 // header file <direct.h>
1230 const char* os::get_current_directory(char *buf, size_t buflen) {
1231 int n = static_cast<int>(buflen);
1232 if (buflen > INT_MAX) n = INT_MAX;
1233 return _getcwd(buf, n);
1234 }
1235
1236 //-----------------------------------------------------------
1237 // Helper functions for fatal error handler
1238 #ifdef _WIN64
1239 // Helper routine which returns true if address in
1240 // within the NTDLL address space.
1241 //
1242 static bool _addr_in_ntdll(address addr) {
1243 HMODULE hmod;
1244 MODULEINFO minfo;
1245
1246 hmod = GetModuleHandle("NTDLL.DLL");
1247 if (hmod == NULL) return false;
1248 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1249 &minfo, sizeof(MODULEINFO))) {
1250 return false;
1251 }
1252
1253 if ((addr >= minfo.lpBaseOfDll) &&
1254 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1255 return true;
1256 } else {
1257 return false;
1258 }
1259 }
1260 #endif
1261
1262 struct _modinfo {
1263 address addr;
1264 char* full_path; // point to a char buffer
1265 int buflen; // size of the buffer
1266 address base_addr;
1267 };
1268
1269 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1270 address top_address, void * param) {
1271 struct _modinfo *pmod = (struct _modinfo *)param;
1272 if (!pmod) return -1;
1273
1274 if (base_addr <= pmod->addr &&
1275 top_address > pmod->addr) {
1276 // if a buffer is provided, copy path name to the buffer
1277 if (pmod->full_path) {
1278 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1279 }
1280 pmod->base_addr = base_addr;
1281 return 1;
1282 }
1283 return 0;
1284 }
1285
1286 bool os::dll_address_to_library_name(address addr, char* buf,
1287 int buflen, int* offset) {
1288 // buf is not optional, but offset is optional
1289 assert(buf != NULL, "sanity check");
1290
1291 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1292 // return the full path to the DLL file, sometimes it returns path
1293 // to the corresponding PDB file (debug info); sometimes it only
1294 // returns partial path, which makes life painful.
1295
1296 struct _modinfo mi;
1297 mi.addr = addr;
1298 mi.full_path = buf;
1299 mi.buflen = buflen;
1300 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1301 // buf already contains path name
1302 if (offset) *offset = addr - mi.base_addr;
1303 return true;
1304 }
1305
1306 buf[0] = '\0';
1307 if (offset) *offset = -1;
1308 return false;
1309 }
1310
1311 bool os::dll_address_to_function_name(address addr, char *buf,
1312 int buflen, int *offset,
1313 bool demangle) {
1314 // buf is not optional, but offset is optional
1315 assert(buf != NULL, "sanity check");
1316
1317 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1318 return true;
1319 }
1320 if (offset != NULL) *offset = -1;
1321 buf[0] = '\0';
1322 return false;
1323 }
1324
1325 // save the start and end address of jvm.dll into param[0] and param[1]
1326 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1327 address top_address, void * param) {
1328 if (!param) return -1;
1329
1330 if (base_addr <= (address)_locate_jvm_dll &&
1331 top_address > (address)_locate_jvm_dll) {
1332 ((address*)param)[0] = base_addr;
1333 ((address*)param)[1] = top_address;
1334 return 1;
1335 }
1336 return 0;
1337 }
1338
1339 address vm_lib_location[2]; // start and end address of jvm.dll
1340
1341 // check if addr is inside jvm.dll
1342 bool os::address_is_in_vm(address addr) {
1343 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1344 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1345 assert(false, "Can't find jvm module.");
1346 return false;
1347 }
1348 }
1349
1350 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1351 }
1352
1353 // print module info; param is outputStream*
1354 static int _print_module(const char* fname, address base_address,
1355 address top_address, void* param) {
1356 if (!param) return -1;
1357
1358 outputStream* st = (outputStream*)param;
1359
1360 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1361 return 0;
1362 }
1363
1364 // Loads .dll/.so and
1365 // in case of error it checks if .dll/.so was built for the
1366 // same architecture as Hotspot is running on
1367 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1368 void * result = LoadLibrary(name);
1369 if (result != NULL) {
1370 Events::log(NULL, "Loaded shared library %s", name);
1371 // Recalculate pdb search path if a DLL was loaded successfully.
1372 SymbolEngine::recalc_search_path();
1373 return result;
1374 }
1375 DWORD errcode = GetLastError();
1376 // Read system error message into ebuf
1377 // It may or may not be overwritten below (in the for loop and just above)
1378 lasterror(ebuf, (size_t) ebuflen);
1379 ebuf[ebuflen - 1] = '\0';
1380 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1381
1382 if (errcode == ERROR_MOD_NOT_FOUND) {
1383 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1384 ebuf[ebuflen - 1] = '\0';
1385 return NULL;
1386 }
1387
1388 // Parsing dll below
1389 // If we can read dll-info and find that dll was built
1390 // for an architecture other than Hotspot is running in
1391 // - then print to buffer "DLL was built for a different architecture"
1392 // else call os::lasterror to obtain system error message
1393 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1394 if (fd < 0) {
1395 return NULL;
1396 }
1397
1398 uint32_t signature_offset;
1399 uint16_t lib_arch = 0;
1400 bool failed_to_get_lib_arch =
1401 ( // Go to position 3c in the dll
1402 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1403 ||
1404 // Read location of signature
1405 (sizeof(signature_offset) !=
1406 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1407 ||
1408 // Go to COFF File Header in dll
1409 // that is located after "signature" (4 bytes long)
1410 (os::seek_to_file_offset(fd,
1411 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1412 ||
1413 // Read field that contains code of architecture
1414 // that dll was built for
1415 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1416 );
1417
1418 ::close(fd);
1419 if (failed_to_get_lib_arch) {
1420 // file i/o error - report os::lasterror(...) msg
1421 return NULL;
1422 }
1423
1424 typedef struct {
1425 uint16_t arch_code;
1426 char* arch_name;
1427 } arch_t;
1428
1429 static const arch_t arch_array[] = {
1430 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1431 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1432 };
1433 #if (defined _M_AMD64)
1434 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1435 #elif (defined _M_IX86)
1436 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1437 #else
1438 #error Method os::dll_load requires that one of following \
1439 is defined :_M_AMD64 or _M_IX86
1440 #endif
1441
1442
1443 // Obtain a string for printf operation
1444 // lib_arch_str shall contain string what platform this .dll was built for
1445 // running_arch_str shall string contain what platform Hotspot was built for
1446 char *running_arch_str = NULL, *lib_arch_str = NULL;
1447 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1448 if (lib_arch == arch_array[i].arch_code) {
1449 lib_arch_str = arch_array[i].arch_name;
1450 }
1451 if (running_arch == arch_array[i].arch_code) {
1452 running_arch_str = arch_array[i].arch_name;
1453 }
1454 }
1455
1456 assert(running_arch_str,
1457 "Didn't find running architecture code in arch_array");
1458
1459 // If the architecture is right
1460 // but some other error took place - report os::lasterror(...) msg
1461 if (lib_arch == running_arch) {
1462 return NULL;
1463 }
1464
1465 if (lib_arch_str != NULL) {
1466 ::_snprintf(ebuf, ebuflen - 1,
1467 "Can't load %s-bit .dll on a %s-bit platform",
1468 lib_arch_str, running_arch_str);
1469 } else {
1470 // don't know what architecture this dll was build for
1471 ::_snprintf(ebuf, ebuflen - 1,
1472 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1473 lib_arch, running_arch_str);
1474 }
1475
1476 return NULL;
1477 }
1478
1479 void os::print_dll_info(outputStream *st) {
1480 st->print_cr("Dynamic libraries:");
1481 get_loaded_modules_info(_print_module, (void *)st);
1482 }
1483
1484 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1485 HANDLE hProcess;
1486
1487 # define MAX_NUM_MODULES 128
1488 HMODULE modules[MAX_NUM_MODULES];
1489 static char filename[MAX_PATH];
1490 int result = 0;
1491
1492 int pid = os::current_process_id();
1493 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1494 FALSE, pid);
1495 if (hProcess == NULL) return 0;
1496
1497 DWORD size_needed;
1498 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1499 CloseHandle(hProcess);
1500 return 0;
1501 }
1502
1503 // number of modules that are currently loaded
1504 int num_modules = size_needed / sizeof(HMODULE);
1505
1506 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1507 // Get Full pathname:
1508 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1509 filename[0] = '\0';
1510 }
1511
1512 MODULEINFO modinfo;
1513 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1514 modinfo.lpBaseOfDll = NULL;
1515 modinfo.SizeOfImage = 0;
1516 }
1517
1518 // Invoke callback function
1519 result = callback(filename, (address)modinfo.lpBaseOfDll,
1520 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1521 if (result) break;
1522 }
1523
1524 CloseHandle(hProcess);
1525 return result;
1526 }
1527
1528 bool os::get_host_name(char* buf, size_t buflen) {
1529 DWORD size = (DWORD)buflen;
1530 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1531 }
1532
1533 void os::get_summary_os_info(char* buf, size_t buflen) {
1534 stringStream sst(buf, buflen);
1535 os::win32::print_windows_version(&sst);
1536 // chop off newline character
1537 char* nl = strchr(buf, '\n');
1538 if (nl != NULL) *nl = '\0';
1539 }
1540
1541 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1542 #if _MSC_VER >= 1900
1543 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1544 int result = ::vsnprintf(buf, len, fmt, args);
1545 // If an encoding error occurred (result < 0) then it's not clear
1546 // whether the buffer is NUL terminated, so ensure it is.
1547 if ((result < 0) && (len > 0)) {
1548 buf[len - 1] = '\0';
1549 }
1550 return result;
1551 #else
1552 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1553 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1554 // versions. However, when len == 0, avoid _vsnprintf too, and just
1555 // go straight to _vscprintf. The output is going to be truncated in
1556 // that case, except in the unusual case of empty output. More
1557 // importantly, the documentation for various versions of Visual Studio
1558 // are inconsistent about the behavior of _vsnprintf when len == 0,
1559 // including it possibly being an error.
1560 int result = -1;
1561 if (len > 0) {
1562 result = _vsnprintf(buf, len, fmt, args);
1563 // If output (including NUL terminator) is truncated, the buffer
1564 // won't be NUL terminated. Add the trailing NUL specified by C99.
1565 if ((result < 0) || ((size_t)result >= len)) {
1566 buf[len - 1] = '\0';
1567 }
1568 }
1569 if (result < 0) {
1570 result = _vscprintf(fmt, args);
1571 }
1572 return result;
1573 #endif // _MSC_VER dispatch
1574 }
1575
1576 static inline time_t get_mtime(const char* filename) {
1577 struct stat st;
1578 int ret = os::stat(filename, &st);
1579 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1580 return st.st_mtime;
1581 }
1582
1583 int os::compare_file_modified_times(const char* file1, const char* file2) {
1584 time_t t1 = get_mtime(file1);
1585 time_t t2 = get_mtime(file2);
1586 return t1 - t2;
1587 }
1588
1589 void os::print_os_info_brief(outputStream* st) {
1590 os::print_os_info(st);
1591 }
1592
1593 void os::print_os_info(outputStream* st) {
1594 #ifdef ASSERT
1595 char buffer[1024];
1596 st->print("HostName: ");
1597 if (get_host_name(buffer, sizeof(buffer))) {
1598 st->print("%s ", buffer);
1599 } else {
1600 st->print("N/A ");
1601 }
1602 #endif
1603 st->print("OS:");
1604 os::win32::print_windows_version(st);
1605
1606 #ifdef _LP64
1607 VM_Version::print_platform_virtualization_info(st);
1608 #endif
1609 }
1610
1611 void os::win32::print_windows_version(outputStream* st) {
1612 OSVERSIONINFOEX osvi;
1613 VS_FIXEDFILEINFO *file_info;
1614 TCHAR kernel32_path[MAX_PATH];
1615 UINT len, ret;
1616
1617 // Use the GetVersionEx information to see if we're on a server or
1618 // workstation edition of Windows. Starting with Windows 8.1 we can't
1619 // trust the OS version information returned by this API.
1620 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1621 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1622 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1623 st->print_cr("Call to GetVersionEx failed");
1624 return;
1625 }
1626 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1627
1628 // Get the full path to \Windows\System32\kernel32.dll and use that for
1629 // determining what version of Windows we're running on.
1630 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1631 ret = GetSystemDirectory(kernel32_path, len);
1632 if (ret == 0 || ret > len) {
1633 st->print_cr("Call to GetSystemDirectory failed");
1634 return;
1635 }
1636 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1637
1638 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1639 if (version_size == 0) {
1640 st->print_cr("Call to GetFileVersionInfoSize failed");
1641 return;
1642 }
1643
1644 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1645 if (version_info == NULL) {
1646 st->print_cr("Failed to allocate version_info");
1647 return;
1648 }
1649
1650 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1651 os::free(version_info);
1652 st->print_cr("Call to GetFileVersionInfo failed");
1653 return;
1654 }
1655
1656 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1657 os::free(version_info);
1658 st->print_cr("Call to VerQueryValue failed");
1659 return;
1660 }
1661
1662 int major_version = HIWORD(file_info->dwProductVersionMS);
1663 int minor_version = LOWORD(file_info->dwProductVersionMS);
1664 int build_number = HIWORD(file_info->dwProductVersionLS);
1665 int build_minor = LOWORD(file_info->dwProductVersionLS);
1666 int os_vers = major_version * 1000 + minor_version;
1667 os::free(version_info);
1668
1669 st->print(" Windows ");
1670 switch (os_vers) {
1671
1672 case 6000:
1673 if (is_workstation) {
1674 st->print("Vista");
1675 } else {
1676 st->print("Server 2008");
1677 }
1678 break;
1679
1680 case 6001:
1681 if (is_workstation) {
1682 st->print("7");
1683 } else {
1684 st->print("Server 2008 R2");
1685 }
1686 break;
1687
1688 case 6002:
1689 if (is_workstation) {
1690 st->print("8");
1691 } else {
1692 st->print("Server 2012");
1693 }
1694 break;
1695
1696 case 6003:
1697 if (is_workstation) {
1698 st->print("8.1");
1699 } else {
1700 st->print("Server 2012 R2");
1701 }
1702 break;
1703
1704 case 10000:
1705 if (is_workstation) {
1706 st->print("10");
1707 } else {
1708 // distinguish Windows Server 2016 and 2019 by build number
1709 // Windows server 2019 GA 10/2018 build number is 17763
1710 if (build_number > 17762) {
1711 st->print("Server 2019");
1712 } else {
1713 st->print("Server 2016");
1714 }
1715 }
1716 break;
1717
1718 default:
1719 // Unrecognized windows, print out its major and minor versions
1720 st->print("%d.%d", major_version, minor_version);
1721 break;
1722 }
1723
1724 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1725 // find out whether we are running on 64 bit processor or not
1726 SYSTEM_INFO si;
1727 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1728 GetNativeSystemInfo(&si);
1729 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1730 st->print(" , 64 bit");
1731 }
1732
1733 st->print(" Build %d", build_number);
1734 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1735 st->cr();
1736 }
1737
1738 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1739 // Nothing to do for now.
1740 }
1741
1742 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1743 HKEY key;
1744 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1745 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1746 if (status == ERROR_SUCCESS) {
1747 DWORD size = (DWORD)buflen;
1748 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1749 if (status != ERROR_SUCCESS) {
1750 strncpy(buf, "## __CPU__", buflen);
1751 }
1752 RegCloseKey(key);
1753 } else {
1754 // Put generic cpu info to return
1755 strncpy(buf, "## __CPU__", buflen);
1756 }
1757 }
1758
1759 void os::print_memory_info(outputStream* st) {
1760 st->print("Memory:");
1761 st->print(" %dk page", os::vm_page_size()>>10);
1762
1763 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1764 // value if total memory is larger than 4GB
1765 MEMORYSTATUSEX ms;
1766 ms.dwLength = sizeof(ms);
1767 int r1 = GlobalMemoryStatusEx(&ms);
1768
1769 if (r1 != 0) {
1770 st->print(", system-wide physical " INT64_FORMAT "M ",
1771 (int64_t) ms.ullTotalPhys >> 20);
1772 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1773
1774 st->print("TotalPageFile size " INT64_FORMAT "M ",
1775 (int64_t) ms.ullTotalPageFile >> 20);
1776 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1777 (int64_t) ms.ullAvailPageFile >> 20);
1778
1779 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1780 #if defined(_M_IX86)
1781 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1782 (int64_t) ms.ullTotalVirtual >> 20);
1783 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1784 #endif
1785 } else {
1786 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1787 }
1788
1789 // extended memory statistics for a process
1790 PROCESS_MEMORY_COUNTERS_EX pmex;
1791 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1792 pmex.cb = sizeof(pmex);
1793 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1794
1795 if (r2 != 0) {
1796 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1797 (int64_t) pmex.WorkingSetSize >> 20);
1798 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1799
1800 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1801 (int64_t) pmex.PrivateUsage >> 20);
1802 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1803 } else {
1804 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1805 }
1806
1807 st->cr();
1808 }
1809
1810 bool os::signal_sent_by_kill(const void* siginfo) {
1811 // TODO: Is this possible?
1812 return false;
1813 }
1814
1815 void os::print_siginfo(outputStream *st, const void* siginfo) {
1816 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1817 st->print("siginfo:");
1818
1819 char tmp[64];
1820 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1821 strcpy(tmp, "EXCEPTION_??");
1822 }
1823 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1824
1825 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1826 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1827 er->NumberParameters >= 2) {
1828 switch (er->ExceptionInformation[0]) {
1829 case 0: st->print(", reading address"); break;
1830 case 1: st->print(", writing address"); break;
1831 case 8: st->print(", data execution prevention violation at address"); break;
1832 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1833 er->ExceptionInformation[0]);
1834 }
1835 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1836 } else {
1837 int num = er->NumberParameters;
1838 if (num > 0) {
1839 st->print(", ExceptionInformation=");
1840 for (int i = 0; i < num; i++) {
1841 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1842 }
1843 }
1844 }
1845 st->cr();
1846 }
1847
1848 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1849 // TODO: Can we kill thread?
1850 return false;
1851 }
1852
1853 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1854 // do nothing
1855 }
1856
1857 static char saved_jvm_path[MAX_PATH] = {0};
1858
1859 // Find the full path to the current module, jvm.dll
1860 void os::jvm_path(char *buf, jint buflen) {
1861 // Error checking.
1862 if (buflen < MAX_PATH) {
1863 assert(false, "must use a large-enough buffer");
1864 buf[0] = '\0';
1865 return;
1866 }
1867 // Lazy resolve the path to current module.
1868 if (saved_jvm_path[0] != 0) {
1869 strcpy(buf, saved_jvm_path);
1870 return;
1871 }
1872
1873 buf[0] = '\0';
1874 if (Arguments::sun_java_launcher_is_altjvm()) {
1875 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1876 // for a JAVA_HOME environment variable and fix up the path so it
1877 // looks like jvm.dll is installed there (append a fake suffix
1878 // hotspot/jvm.dll).
1879 char* java_home_var = ::getenv("JAVA_HOME");
1880 if (java_home_var != NULL && java_home_var[0] != 0 &&
1881 strlen(java_home_var) < (size_t)buflen) {
1882 strncpy(buf, java_home_var, buflen);
1883
1884 // determine if this is a legacy image or modules image
1885 // modules image doesn't have "jre" subdirectory
1886 size_t len = strlen(buf);
1887 char* jrebin_p = buf + len;
1888 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1889 if (0 != _access(buf, 0)) {
1890 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1891 }
1892 len = strlen(buf);
1893 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1894 }
1895 }
1896
1897 if (buf[0] == '\0') {
1898 GetModuleFileName(vm_lib_handle, buf, buflen);
1899 }
1900 strncpy(saved_jvm_path, buf, MAX_PATH);
1901 saved_jvm_path[MAX_PATH - 1] = '\0';
1902 }
1903
1904
1905 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1906 #ifndef _WIN64
1907 st->print("_");
1908 #endif
1909 }
1910
1911
1912 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1913 #ifndef _WIN64
1914 st->print("@%d", args_size * sizeof(int));
1915 #endif
1916 }
1917
1918 // This method is a copy of JDK's sysGetLastErrorString
1919 // from src/windows/hpi/src/system_md.c
1920
1921 size_t os::lasterror(char* buf, size_t len) {
1922 DWORD errval;
1923
1924 if ((errval = GetLastError()) != 0) {
1925 // DOS error
1926 size_t n = (size_t)FormatMessage(
1927 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1928 NULL,
1929 errval,
1930 0,
1931 buf,
1932 (DWORD)len,
1933 NULL);
1934 if (n > 3) {
1935 // Drop final '.', CR, LF
1936 if (buf[n - 1] == '\n') n--;
1937 if (buf[n - 1] == '\r') n--;
1938 if (buf[n - 1] == '.') n--;
1939 buf[n] = '\0';
1940 }
1941 return n;
1942 }
1943
1944 if (errno != 0) {
1945 // C runtime error that has no corresponding DOS error code
1946 const char* s = os::strerror(errno);
1947 size_t n = strlen(s);
1948 if (n >= len) n = len - 1;
1949 strncpy(buf, s, n);
1950 buf[n] = '\0';
1951 return n;
1952 }
1953
1954 return 0;
1955 }
1956
1957 int os::get_last_error() {
1958 DWORD error = GetLastError();
1959 if (error == 0) {
1960 error = errno;
1961 }
1962 return (int)error;
1963 }
1964
1965 // sun.misc.Signal
1966 // NOTE that this is a workaround for an apparent kernel bug where if
1967 // a signal handler for SIGBREAK is installed then that signal handler
1968 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1969 // See bug 4416763.
1970 static void (*sigbreakHandler)(int) = NULL;
1971
1972 static void UserHandler(int sig, void *siginfo, void *context) {
1973 os::signal_notify(sig);
1974 // We need to reinstate the signal handler each time...
1975 os::signal(sig, (void*)UserHandler);
1976 }
1977
1978 void* os::user_handler() {
1979 return (void*) UserHandler;
1980 }
1981
1982 void* os::signal(int signal_number, void* handler) {
1983 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1984 void (*oldHandler)(int) = sigbreakHandler;
1985 sigbreakHandler = (void (*)(int)) handler;
1986 return (void*) oldHandler;
1987 } else {
1988 return (void*)::signal(signal_number, (void (*)(int))handler);
1989 }
1990 }
1991
1992 void os::signal_raise(int signal_number) {
1993 raise(signal_number);
1994 }
1995
1996 // The Win32 C runtime library maps all console control events other than ^C
1997 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1998 // logoff, and shutdown events. We therefore install our own console handler
1999 // that raises SIGTERM for the latter cases.
2000 //
2001 static BOOL WINAPI consoleHandler(DWORD event) {
2002 switch (event) {
2003 case CTRL_C_EVENT:
2004 if (VMError::is_error_reported()) {
2005 // Ctrl-C is pressed during error reporting, likely because the error
2006 // handler fails to abort. Let VM die immediately.
2007 os::die();
2008 }
2009
2010 os::signal_raise(SIGINT);
2011 return TRUE;
2012 break;
2013 case CTRL_BREAK_EVENT:
2014 if (sigbreakHandler != NULL) {
2015 (*sigbreakHandler)(SIGBREAK);
2016 }
2017 return TRUE;
2018 break;
2019 case CTRL_LOGOFF_EVENT: {
2020 // Don't terminate JVM if it is running in a non-interactive session,
2021 // such as a service process.
2022 USEROBJECTFLAGS flags;
2023 HANDLE handle = GetProcessWindowStation();
2024 if (handle != NULL &&
2025 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2026 sizeof(USEROBJECTFLAGS), NULL)) {
2027 // If it is a non-interactive session, let next handler to deal
2028 // with it.
2029 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2030 return FALSE;
2031 }
2032 }
2033 }
2034 case CTRL_CLOSE_EVENT:
2035 case CTRL_SHUTDOWN_EVENT:
2036 os::signal_raise(SIGTERM);
2037 return TRUE;
2038 break;
2039 default:
2040 break;
2041 }
2042 return FALSE;
2043 }
2044
2045 // The following code is moved from os.cpp for making this
2046 // code platform specific, which it is by its very nature.
2047
2048 // Return maximum OS signal used + 1 for internal use only
2049 // Used as exit signal for signal_thread
2050 int os::sigexitnum_pd() {
2051 return NSIG;
2052 }
2053
2054 // a counter for each possible signal value, including signal_thread exit signal
2055 static volatile jint pending_signals[NSIG+1] = { 0 };
2056 static Semaphore* sig_sem = NULL;
2057
2058 static void jdk_misc_signal_init() {
2059 // Initialize signal structures
2060 memset((void*)pending_signals, 0, sizeof(pending_signals));
2061
2062 // Initialize signal semaphore
2063 sig_sem = new Semaphore();
2064
2065 // Programs embedding the VM do not want it to attempt to receive
2066 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2067 // shutdown hooks mechanism introduced in 1.3. For example, when
2068 // the VM is run as part of a Windows NT service (i.e., a servlet
2069 // engine in a web server), the correct behavior is for any console
2070 // control handler to return FALSE, not TRUE, because the OS's
2071 // "final" handler for such events allows the process to continue if
2072 // it is a service (while terminating it if it is not a service).
2073 // To make this behavior uniform and the mechanism simpler, we
2074 // completely disable the VM's usage of these console events if -Xrs
2075 // (=ReduceSignalUsage) is specified. This means, for example, that
2076 // the CTRL-BREAK thread dump mechanism is also disabled in this
2077 // case. See bugs 4323062, 4345157, and related bugs.
2078
2079 // Add a CTRL-C handler
2080 SetConsoleCtrlHandler(consoleHandler, TRUE);
2081 }
2082
2083 void os::signal_notify(int sig) {
2084 if (sig_sem != NULL) {
2085 Atomic::inc(&pending_signals[sig]);
2086 sig_sem->signal();
2087 } else {
2088 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2089 // initialization isn't called.
2090 assert(ReduceSignalUsage, "signal semaphore should be created");
2091 }
2092 }
2093
2094 static int check_pending_signals() {
2095 while (true) {
2096 for (int i = 0; i < NSIG + 1; i++) {
2097 jint n = pending_signals[i];
2098 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2099 return i;
2100 }
2101 }
2102 JavaThread *thread = JavaThread::current();
2103
2104 ThreadBlockInVM tbivm(thread);
2105
2106 bool threadIsSuspended;
2107 do {
2108 thread->set_suspend_equivalent();
2109 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2110 sig_sem->wait();
2111
2112 // were we externally suspended while we were waiting?
2113 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2114 if (threadIsSuspended) {
2115 // The semaphore has been incremented, but while we were waiting
2116 // another thread suspended us. We don't want to continue running
2117 // while suspended because that would surprise the thread that
2118 // suspended us.
2119 sig_sem->signal();
2120
2121 thread->java_suspend_self();
2122 }
2123 } while (threadIsSuspended);
2124 }
2125 }
2126
2127 int os::signal_wait() {
2128 return check_pending_signals();
2129 }
2130
2131 // Implicit OS exception handling
2132
2133 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2134 address handler) {
2135 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2136 // Save pc in thread
2137 #ifdef _M_AMD64
2138 // Do not blow up if no thread info available.
2139 if (thread) {
2140 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2141 }
2142 // Set pc to handler
2143 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2144 #else
2145 // Do not blow up if no thread info available.
2146 if (thread) {
2147 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2148 }
2149 // Set pc to handler
2150 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2151 #endif
2152
2153 // Continue the execution
2154 return EXCEPTION_CONTINUE_EXECUTION;
2155 }
2156
2157
2158 // Used for PostMortemDump
2159 extern "C" void safepoints();
2160 extern "C" void find(int x);
2161 extern "C" void events();
2162
2163 // According to Windows API documentation, an illegal instruction sequence should generate
2164 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2165 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2166 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2167
2168 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2169
2170 // From "Execution Protection in the Windows Operating System" draft 0.35
2171 // Once a system header becomes available, the "real" define should be
2172 // included or copied here.
2173 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2174
2175 // Windows Vista/2008 heap corruption check
2176 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2177
2178 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2179 // C++ compiler contain this error code. Because this is a compiler-generated
2180 // error, the code is not listed in the Win32 API header files.
2181 // The code is actually a cryptic mnemonic device, with the initial "E"
2182 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2183 // ASCII values of "msc".
2184
2185 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2186
2187 #define def_excpt(val) { #val, (val) }
2188
2189 static const struct { const char* name; uint number; } exceptlabels[] = {
2190 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2191 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2192 def_excpt(EXCEPTION_BREAKPOINT),
2193 def_excpt(EXCEPTION_SINGLE_STEP),
2194 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2195 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2196 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2197 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2198 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2199 def_excpt(EXCEPTION_FLT_OVERFLOW),
2200 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2201 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2202 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2203 def_excpt(EXCEPTION_INT_OVERFLOW),
2204 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2205 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2206 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2207 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2208 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2209 def_excpt(EXCEPTION_STACK_OVERFLOW),
2210 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2211 def_excpt(EXCEPTION_GUARD_PAGE),
2212 def_excpt(EXCEPTION_INVALID_HANDLE),
2213 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2214 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2215 };
2216
2217 #undef def_excpt
2218
2219 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2220 uint code = static_cast<uint>(exception_code);
2221 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2222 if (exceptlabels[i].number == code) {
2223 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2224 return buf;
2225 }
2226 }
2227
2228 return NULL;
2229 }
2230
2231 //-----------------------------------------------------------------------------
2232 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2233 // handle exception caused by idiv; should only happen for -MinInt/-1
2234 // (division by zero is handled explicitly)
2235 #ifdef _M_AMD64
2236 PCONTEXT ctx = exceptionInfo->ContextRecord;
2237 address pc = (address)ctx->Rip;
2238 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2239 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2240 if (pc[0] == 0xF7) {
2241 // set correct result values and continue after idiv instruction
2242 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2243 } else {
2244 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2245 }
2246 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2247 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2248 // idiv opcode (0xF7).
2249 ctx->Rdx = (DWORD)0; // remainder
2250 // Continue the execution
2251 #else
2252 PCONTEXT ctx = exceptionInfo->ContextRecord;
2253 address pc = (address)ctx->Eip;
2254 assert(pc[0] == 0xF7, "not an idiv opcode");
2255 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2256 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2257 // set correct result values and continue after idiv instruction
2258 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2259 ctx->Eax = (DWORD)min_jint; // result
2260 ctx->Edx = (DWORD)0; // remainder
2261 // Continue the execution
2262 #endif
2263 return EXCEPTION_CONTINUE_EXECUTION;
2264 }
2265
2266 //-----------------------------------------------------------------------------
2267 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2268 PCONTEXT ctx = exceptionInfo->ContextRecord;
2269 #ifndef _WIN64
2270 // handle exception caused by native method modifying control word
2271 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2272
2273 switch (exception_code) {
2274 case EXCEPTION_FLT_DENORMAL_OPERAND:
2275 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2276 case EXCEPTION_FLT_INEXACT_RESULT:
2277 case EXCEPTION_FLT_INVALID_OPERATION:
2278 case EXCEPTION_FLT_OVERFLOW:
2279 case EXCEPTION_FLT_STACK_CHECK:
2280 case EXCEPTION_FLT_UNDERFLOW:
2281 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2282 if (fp_control_word != ctx->FloatSave.ControlWord) {
2283 // Restore FPCW and mask out FLT exceptions
2284 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2285 // Mask out pending FLT exceptions
2286 ctx->FloatSave.StatusWord &= 0xffffff00;
2287 return EXCEPTION_CONTINUE_EXECUTION;
2288 }
2289 }
2290
2291 if (prev_uef_handler != NULL) {
2292 // We didn't handle this exception so pass it to the previous
2293 // UnhandledExceptionFilter.
2294 return (prev_uef_handler)(exceptionInfo);
2295 }
2296 #else // !_WIN64
2297 // On Windows, the mxcsr control bits are non-volatile across calls
2298 // See also CR 6192333
2299 //
2300 jint MxCsr = INITIAL_MXCSR;
2301 // we can't use StubRoutines::addr_mxcsr_std()
2302 // because in Win64 mxcsr is not saved there
2303 if (MxCsr != ctx->MxCsr) {
2304 ctx->MxCsr = MxCsr;
2305 return EXCEPTION_CONTINUE_EXECUTION;
2306 }
2307 #endif // !_WIN64
2308
2309 return EXCEPTION_CONTINUE_SEARCH;
2310 }
2311
2312 static inline void report_error(Thread* t, DWORD exception_code,
2313 address addr, void* siginfo, void* context) {
2314 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2315
2316 // If UseOsErrorReporting, this will return here and save the error file
2317 // somewhere where we can find it in the minidump.
2318 }
2319
2320 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2321 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2322 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2323 address addr = (address) exceptionRecord->ExceptionInformation[1];
2324 if (Interpreter::contains(pc)) {
2325 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2326 if (!fr->is_first_java_frame()) {
2327 // get_frame_at_stack_banging_point() is only called when we
2328 // have well defined stacks so java_sender() calls do not need
2329 // to assert safe_for_sender() first.
2330 *fr = fr->java_sender();
2331 }
2332 } else {
2333 // more complex code with compiled code
2334 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2335 CodeBlob* cb = CodeCache::find_blob(pc);
2336 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2337 // Not sure where the pc points to, fallback to default
2338 // stack overflow handling
2339 return false;
2340 } else {
2341 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2342 // in compiled code, the stack banging is performed just after the return pc
2343 // has been pushed on the stack
2344 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2345 if (!fr->is_java_frame()) {
2346 // See java_sender() comment above.
2347 *fr = fr->java_sender();
2348 }
2349 }
2350 }
2351 assert(fr->is_java_frame(), "Safety check");
2352 return true;
2353 }
2354
2355 #if INCLUDE_AOT
2356 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2357 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2358 address addr = (address) exceptionRecord->ExceptionInformation[1];
2359 address pc = (address) exceptionInfo->ContextRecord->Rip;
2360
2361 // Handle the case where we get an implicit exception in AOT generated
2362 // code. AOT DLL's loaded are not registered for structured exceptions.
2363 // If the exception occurred in the codeCache or AOT code, pass control
2364 // to our normal exception handler.
2365 CodeBlob* cb = CodeCache::find_blob(pc);
2366 if (cb != NULL) {
2367 return topLevelExceptionFilter(exceptionInfo);
2368 }
2369
2370 return EXCEPTION_CONTINUE_SEARCH;
2371 }
2372 #endif
2373
2374 //-----------------------------------------------------------------------------
2375 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2376 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2377 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2378 #ifdef _M_AMD64
2379 address pc = (address) exceptionInfo->ContextRecord->Rip;
2380 #else
2381 address pc = (address) exceptionInfo->ContextRecord->Eip;
2382 #endif
2383 Thread* t = Thread::current_or_null_safe();
2384
2385 // Handle SafeFetch32 and SafeFetchN exceptions.
2386 if (StubRoutines::is_safefetch_fault(pc)) {
2387 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2388 }
2389
2390 #ifndef _WIN64
2391 // Execution protection violation - win32 running on AMD64 only
2392 // Handled first to avoid misdiagnosis as a "normal" access violation;
2393 // This is safe to do because we have a new/unique ExceptionInformation
2394 // code for this condition.
2395 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2396 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2397 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2398 address addr = (address) exceptionRecord->ExceptionInformation[1];
2399
2400 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2401 int page_size = os::vm_page_size();
2402
2403 // Make sure the pc and the faulting address are sane.
2404 //
2405 // If an instruction spans a page boundary, and the page containing
2406 // the beginning of the instruction is executable but the following
2407 // page is not, the pc and the faulting address might be slightly
2408 // different - we still want to unguard the 2nd page in this case.
2409 //
2410 // 15 bytes seems to be a (very) safe value for max instruction size.
2411 bool pc_is_near_addr =
2412 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2413 bool instr_spans_page_boundary =
2414 (align_down((intptr_t) pc ^ (intptr_t) addr,
2415 (intptr_t) page_size) > 0);
2416
2417 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2418 static volatile address last_addr =
2419 (address) os::non_memory_address_word();
2420
2421 // In conservative mode, don't unguard unless the address is in the VM
2422 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2423 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2424
2425 // Set memory to RWX and retry
2426 address page_start = align_down(addr, page_size);
2427 bool res = os::protect_memory((char*) page_start, page_size,
2428 os::MEM_PROT_RWX);
2429
2430 log_debug(os)("Execution protection violation "
2431 "at " INTPTR_FORMAT
2432 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2433 p2i(page_start), (res ? "success" : os::strerror(errno)));
2434
2435 // Set last_addr so if we fault again at the same address, we don't
2436 // end up in an endless loop.
2437 //
2438 // There are two potential complications here. Two threads trapping
2439 // at the same address at the same time could cause one of the
2440 // threads to think it already unguarded, and abort the VM. Likely
2441 // very rare.
2442 //
2443 // The other race involves two threads alternately trapping at
2444 // different addresses and failing to unguard the page, resulting in
2445 // an endless loop. This condition is probably even more unlikely
2446 // than the first.
2447 //
2448 // Although both cases could be avoided by using locks or thread
2449 // local last_addr, these solutions are unnecessary complication:
2450 // this handler is a best-effort safety net, not a complete solution.
2451 // It is disabled by default and should only be used as a workaround
2452 // in case we missed any no-execute-unsafe VM code.
2453
2454 last_addr = addr;
2455
2456 return EXCEPTION_CONTINUE_EXECUTION;
2457 }
2458 }
2459
2460 // Last unguard failed or not unguarding
2461 tty->print_raw_cr("Execution protection violation");
2462 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2463 exceptionInfo->ContextRecord);
2464 return EXCEPTION_CONTINUE_SEARCH;
2465 }
2466 }
2467 #endif // _WIN64
2468
2469 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2470 VM_Version::is_cpuinfo_segv_addr(pc)) {
2471 // Verify that OS save/restore AVX registers.
2472 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2473 }
2474
2475 if (t != NULL && t->is_Java_thread()) {
2476 JavaThread* thread = (JavaThread*) t;
2477 bool in_java = thread->thread_state() == _thread_in_Java;
2478
2479 // Handle potential stack overflows up front.
2480 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2481 if (thread->stack_guards_enabled()) {
2482 if (in_java) {
2483 frame fr;
2484 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2485 address addr = (address) exceptionRecord->ExceptionInformation[1];
2486 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2487 assert(fr.is_java_frame(), "Must be a Java frame");
2488 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2489 }
2490 }
2491 // Yellow zone violation. The o/s has unprotected the first yellow
2492 // zone page for us. Note: must call disable_stack_yellow_zone to
2493 // update the enabled status, even if the zone contains only one page.
2494 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2495 thread->disable_stack_yellow_reserved_zone();
2496 // If not in java code, return and hope for the best.
2497 return in_java
2498 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2499 : EXCEPTION_CONTINUE_EXECUTION;
2500 } else {
2501 // Fatal red zone violation.
2502 thread->disable_stack_red_zone();
2503 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2504 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2505 exceptionInfo->ContextRecord);
2506 return EXCEPTION_CONTINUE_SEARCH;
2507 }
2508 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2509 // Either stack overflow or null pointer exception.
2510 if (in_java) {
2511 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2512 address addr = (address) exceptionRecord->ExceptionInformation[1];
2513 address stack_end = thread->stack_end();
2514 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2515 // Stack overflow.
2516 assert(!os::uses_stack_guard_pages(),
2517 "should be caught by red zone code above.");
2518 return Handle_Exception(exceptionInfo,
2519 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2520 }
2521 // Check for safepoint polling and implicit null
2522 // We only expect null pointers in the stubs (vtable)
2523 // the rest are checked explicitly now.
2524 CodeBlob* cb = CodeCache::find_blob(pc);
2525 if (cb != NULL) {
2526 if (os::is_poll_address(addr)) {
2527 address stub = SharedRuntime::get_poll_stub(pc);
2528 return Handle_Exception(exceptionInfo, stub);
2529 }
2530 }
2531 {
2532 #ifdef _WIN64
2533 // If it's a legal stack address map the entire region in
2534 //
2535 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2536 address addr = (address) exceptionRecord->ExceptionInformation[1];
2537 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
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 } else
2544 #endif
2545 {
2546 // Null pointer exception.
2547 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2548 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2549 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2550 }
2551 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2552 exceptionInfo->ContextRecord);
2553 return EXCEPTION_CONTINUE_SEARCH;
2554 }
2555 }
2556 }
2557
2558 #ifdef _WIN64
2559 // Special care for fast JNI field accessors.
2560 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2561 // in and the heap gets shrunk before the field access.
2562 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2563 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2564 if (addr != (address)-1) {
2565 return Handle_Exception(exceptionInfo, addr);
2566 }
2567 }
2568 #endif
2569
2570 // Stack overflow or null pointer exception in native code.
2571 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2572 exceptionInfo->ContextRecord);
2573 return EXCEPTION_CONTINUE_SEARCH;
2574 } // /EXCEPTION_ACCESS_VIOLATION
2575 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2576
2577 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2578 CompiledMethod* nm = NULL;
2579 JavaThread* thread = (JavaThread*)t;
2580 if (in_java) {
2581 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2582 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2583 }
2584
2585 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2586 if (((thread->thread_state() == _thread_in_vm ||
2587 thread->thread_state() == _thread_in_native ||
2588 is_unsafe_arraycopy) &&
2589 thread->doing_unsafe_access()) ||
2590 (nm != NULL && nm->has_unsafe_access())) {
2591 address next_pc = Assembler::locate_next_instruction(pc);
2592 if (is_unsafe_arraycopy) {
2593 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2594 }
2595 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2596 }
2597 }
2598
2599 if (in_java) {
2600 switch (exception_code) {
2601 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2602 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2603
2604 case EXCEPTION_INT_OVERFLOW:
2605 return Handle_IDiv_Exception(exceptionInfo);
2606
2607 } // switch
2608 }
2609 if (((thread->thread_state() == _thread_in_Java) ||
2610 (thread->thread_state() == _thread_in_native)) &&
2611 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2612 LONG result=Handle_FLT_Exception(exceptionInfo);
2613 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2614 }
2615 }
2616
2617 if (exception_code != EXCEPTION_BREAKPOINT) {
2618 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2619 exceptionInfo->ContextRecord);
2620 }
2621 return EXCEPTION_CONTINUE_SEARCH;
2622 }
2623
2624 #ifndef _WIN64
2625 // Special care for fast JNI accessors.
2626 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2627 // the heap gets shrunk before the field access.
2628 // Need to install our own structured exception handler since native code may
2629 // install its own.
2630 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2631 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2632 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2633 address pc = (address) exceptionInfo->ContextRecord->Eip;
2634 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2635 if (addr != (address)-1) {
2636 return Handle_Exception(exceptionInfo, addr);
2637 }
2638 }
2639 return EXCEPTION_CONTINUE_SEARCH;
2640 }
2641
2642 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2643 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2644 jobject obj, \
2645 jfieldID fieldID) { \
2646 __try { \
2647 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2648 obj, \
2649 fieldID); \
2650 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2651 _exception_info())) { \
2652 } \
2653 return 0; \
2654 }
2655
2656 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2657 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2658 DEFINE_FAST_GETFIELD(jchar, char, Char)
2659 DEFINE_FAST_GETFIELD(jshort, short, Short)
2660 DEFINE_FAST_GETFIELD(jint, int, Int)
2661 DEFINE_FAST_GETFIELD(jlong, long, Long)
2662 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2663 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2664
2665 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2666 switch (type) {
2667 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2668 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2669 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2670 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2671 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2672 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2673 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2674 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2675 default: ShouldNotReachHere();
2676 }
2677 return (address)-1;
2678 }
2679 #endif
2680
2681 // Virtual Memory
2682
2683 int os::vm_page_size() { return os::win32::vm_page_size(); }
2684 int os::vm_allocation_granularity() {
2685 return os::win32::vm_allocation_granularity();
2686 }
2687
2688 // Windows large page support is available on Windows 2003. In order to use
2689 // large page memory, the administrator must first assign additional privilege
2690 // to the user:
2691 // + select Control Panel -> Administrative Tools -> Local Security Policy
2692 // + select Local Policies -> User Rights Assignment
2693 // + double click "Lock pages in memory", add users and/or groups
2694 // + reboot
2695 // Note the above steps are needed for administrator as well, as administrators
2696 // by default do not have the privilege to lock pages in memory.
2697 //
2698 // Note about Windows 2003: although the API supports committing large page
2699 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2700 // scenario, I found through experiment it only uses large page if the entire
2701 // memory region is reserved and committed in a single VirtualAlloc() call.
2702 // This makes Windows large page support more or less like Solaris ISM, in
2703 // that the entire heap must be committed upfront. This probably will change
2704 // in the future, if so the code below needs to be revisited.
2705
2706 #ifndef MEM_LARGE_PAGES
2707 #define MEM_LARGE_PAGES 0x20000000
2708 #endif
2709
2710 static HANDLE _hProcess;
2711 static HANDLE _hToken;
2712
2713 // Container for NUMA node list info
2714 class NUMANodeListHolder {
2715 private:
2716 int *_numa_used_node_list; // allocated below
2717 int _numa_used_node_count;
2718
2719 void free_node_list() {
2720 if (_numa_used_node_list != NULL) {
2721 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2722 }
2723 }
2724
2725 public:
2726 NUMANodeListHolder() {
2727 _numa_used_node_count = 0;
2728 _numa_used_node_list = NULL;
2729 // do rest of initialization in build routine (after function pointers are set up)
2730 }
2731
2732 ~NUMANodeListHolder() {
2733 free_node_list();
2734 }
2735
2736 bool build() {
2737 DWORD_PTR proc_aff_mask;
2738 DWORD_PTR sys_aff_mask;
2739 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2740 ULONG highest_node_number;
2741 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2742 free_node_list();
2743 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2744 for (unsigned int i = 0; i <= highest_node_number; i++) {
2745 ULONGLONG proc_mask_numa_node;
2746 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2747 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2748 _numa_used_node_list[_numa_used_node_count++] = i;
2749 }
2750 }
2751 return (_numa_used_node_count > 1);
2752 }
2753
2754 int get_count() { return _numa_used_node_count; }
2755 int get_node_list_entry(int n) {
2756 // for indexes out of range, returns -1
2757 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2758 }
2759
2760 } numa_node_list_holder;
2761
2762
2763
2764 static size_t _large_page_size = 0;
2765
2766 static bool request_lock_memory_privilege() {
2767 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2768 os::current_process_id());
2769
2770 LUID luid;
2771 if (_hProcess != NULL &&
2772 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2773 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2774
2775 TOKEN_PRIVILEGES tp;
2776 tp.PrivilegeCount = 1;
2777 tp.Privileges[0].Luid = luid;
2778 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2779
2780 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2781 // privilege. Check GetLastError() too. See MSDN document.
2782 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2783 (GetLastError() == ERROR_SUCCESS)) {
2784 return true;
2785 }
2786 }
2787
2788 return false;
2789 }
2790
2791 static void cleanup_after_large_page_init() {
2792 if (_hProcess) CloseHandle(_hProcess);
2793 _hProcess = NULL;
2794 if (_hToken) CloseHandle(_hToken);
2795 _hToken = NULL;
2796 }
2797
2798 static bool numa_interleaving_init() {
2799 bool success = false;
2800 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2801
2802 // print a warning if UseNUMAInterleaving flag is specified on command line
2803 bool warn_on_failure = use_numa_interleaving_specified;
2804 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2805
2806 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2807 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2808 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2809
2810 if (numa_node_list_holder.build()) {
2811 if (log_is_enabled(Debug, os, cpu)) {
2812 Log(os, cpu) log;
2813 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2814 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2815 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2816 }
2817 }
2818 success = true;
2819 } else {
2820 WARN("Process does not cover multiple NUMA nodes.");
2821 }
2822 if (!success) {
2823 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2824 }
2825 return success;
2826 #undef WARN
2827 }
2828
2829 // this routine is used whenever we need to reserve a contiguous VA range
2830 // but we need to make separate VirtualAlloc calls for each piece of the range
2831 // Reasons for doing this:
2832 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2833 // * UseNUMAInterleaving requires a separate node for each piece
2834 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2835 DWORD prot,
2836 bool should_inject_error = false) {
2837 char * p_buf;
2838 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2839 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2840 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2841
2842 // first reserve enough address space in advance since we want to be
2843 // able to break a single contiguous virtual address range into multiple
2844 // large page commits but WS2003 does not allow reserving large page space
2845 // so we just use 4K pages for reserve, this gives us a legal contiguous
2846 // address space. then we will deallocate that reservation, and re alloc
2847 // using large pages
2848 const size_t size_of_reserve = bytes + chunk_size;
2849 if (bytes > size_of_reserve) {
2850 // Overflowed.
2851 return NULL;
2852 }
2853 p_buf = (char *) VirtualAlloc(addr,
2854 size_of_reserve, // size of Reserve
2855 MEM_RESERVE,
2856 PAGE_READWRITE);
2857 // If reservation failed, return NULL
2858 if (p_buf == NULL) return NULL;
2859 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2860 os::release_memory(p_buf, bytes + chunk_size);
2861
2862 // we still need to round up to a page boundary (in case we are using large pages)
2863 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2864 // instead we handle this in the bytes_to_rq computation below
2865 p_buf = align_up(p_buf, page_size);
2866
2867 // now go through and allocate one chunk at a time until all bytes are
2868 // allocated
2869 size_t bytes_remaining = bytes;
2870 // An overflow of align_up() would have been caught above
2871 // in the calculation of size_of_reserve.
2872 char * next_alloc_addr = p_buf;
2873 HANDLE hProc = GetCurrentProcess();
2874
2875 #ifdef ASSERT
2876 // Variable for the failure injection
2877 int ran_num = os::random();
2878 size_t fail_after = ran_num % bytes;
2879 #endif
2880
2881 int count=0;
2882 while (bytes_remaining) {
2883 // select bytes_to_rq to get to the next chunk_size boundary
2884
2885 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2886 // Note allocate and commit
2887 char * p_new;
2888
2889 #ifdef ASSERT
2890 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2891 #else
2892 const bool inject_error_now = false;
2893 #endif
2894
2895 if (inject_error_now) {
2896 p_new = NULL;
2897 } else {
2898 if (!UseNUMAInterleaving) {
2899 p_new = (char *) VirtualAlloc(next_alloc_addr,
2900 bytes_to_rq,
2901 flags,
2902 prot);
2903 } else {
2904 // get the next node to use from the used_node_list
2905 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2906 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2907 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2908 }
2909 }
2910
2911 if (p_new == NULL) {
2912 // Free any allocated pages
2913 if (next_alloc_addr > p_buf) {
2914 // Some memory was committed so release it.
2915 size_t bytes_to_release = bytes - bytes_remaining;
2916 // NMT has yet to record any individual blocks, so it
2917 // need to create a dummy 'reserve' record to match
2918 // the release.
2919 MemTracker::record_virtual_memory_reserve((address)p_buf,
2920 bytes_to_release, CALLER_PC);
2921 os::release_memory(p_buf, bytes_to_release);
2922 }
2923 #ifdef ASSERT
2924 if (should_inject_error) {
2925 log_develop_debug(pagesize)("Reserving pages individually failed.");
2926 }
2927 #endif
2928 return NULL;
2929 }
2930
2931 bytes_remaining -= bytes_to_rq;
2932 next_alloc_addr += bytes_to_rq;
2933 count++;
2934 }
2935 // Although the memory is allocated individually, it is returned as one.
2936 // NMT records it as one block.
2937 if ((flags & MEM_COMMIT) != 0) {
2938 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2939 } else {
2940 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2941 }
2942
2943 // made it this far, success
2944 return p_buf;
2945 }
2946
2947
2948
2949 void os::large_page_init() {
2950 if (!UseLargePages) return;
2951
2952 // print a warning if any large page related flag is specified on command line
2953 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2954 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2955 bool success = false;
2956
2957 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2958 if (request_lock_memory_privilege()) {
2959 size_t s = GetLargePageMinimum();
2960 if (s) {
2961 #if defined(IA32) || defined(AMD64)
2962 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2963 WARN("JVM cannot use large pages bigger than 4mb.");
2964 } else {
2965 #endif
2966 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2967 _large_page_size = LargePageSizeInBytes;
2968 } else {
2969 _large_page_size = s;
2970 }
2971 success = true;
2972 #if defined(IA32) || defined(AMD64)
2973 }
2974 #endif
2975 } else {
2976 WARN("Large page is not supported by the processor.");
2977 }
2978 } else {
2979 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2980 }
2981 #undef WARN
2982
2983 const size_t default_page_size = (size_t) vm_page_size();
2984 if (success && _large_page_size > default_page_size) {
2985 _page_sizes[0] = _large_page_size;
2986 _page_sizes[1] = default_page_size;
2987 _page_sizes[2] = 0;
2988 }
2989
2990 cleanup_after_large_page_init();
2991 UseLargePages = success;
2992 }
2993
2994 int os::create_file_for_heap(const char* dir) {
2995
2996 const char name_template[] = "/jvmheap.XXXXXX";
2997
2998 size_t fullname_len = strlen(dir) + strlen(name_template);
2999 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3000 if (fullname == NULL) {
3001 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3002 return -1;
3003 }
3004 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3005 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3006
3007 os::native_path(fullname);
3008
3009 char *path = _mktemp(fullname);
3010 if (path == NULL) {
3011 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3012 os::free(fullname);
3013 return -1;
3014 }
3015
3016 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3017
3018 os::free(fullname);
3019 if (fd < 0) {
3020 warning("Problem opening file for heap (%s)", os::strerror(errno));
3021 return -1;
3022 }
3023 return fd;
3024 }
3025
3026 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3027 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3028 assert(fd != -1, "File descriptor is not valid");
3029
3030 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3031 #ifdef _LP64
3032 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3033 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3034 #else
3035 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3036 0, (DWORD)size, NULL);
3037 #endif
3038 if (fileMapping == NULL) {
3039 if (GetLastError() == ERROR_DISK_FULL) {
3040 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3041 }
3042 else {
3043 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3044 }
3045
3046 return NULL;
3047 }
3048
3049 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3050
3051 CloseHandle(fileMapping);
3052
3053 return (char*)addr;
3054 }
3055
3056 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3057 assert(fd != -1, "File descriptor is not valid");
3058 assert(base != NULL, "Base address cannot be NULL");
3059
3060 release_memory(base, size);
3061 return map_memory_to_file(base, size, fd);
3062 }
3063
3064 // On win32, one cannot release just a part of reserved memory, it's an
3065 // all or nothing deal. When we split a reservation, we must break the
3066 // reservation into two reservations.
3067 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3068 bool realloc) {
3069 if (size > 0) {
3070 release_memory(base, size);
3071 if (realloc) {
3072 reserve_memory(split, base);
3073 }
3074 if (size != split) {
3075 reserve_memory(size - split, base + split);
3076 }
3077 }
3078 }
3079
3080 // Multiple threads can race in this code but it's not possible to unmap small sections of
3081 // virtual space to get requested alignment, like posix-like os's.
3082 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3083 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3084 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3085 "Alignment must be a multiple of allocation granularity (page size)");
3086 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3087
3088 size_t extra_size = size + alignment;
3089 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3090
3091 char* aligned_base = NULL;
3092
3093 do {
3094 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3095 if (extra_base == NULL) {
3096 return NULL;
3097 }
3098 // Do manual alignment
3099 aligned_base = align_up(extra_base, alignment);
3100
3101 if (file_desc != -1) {
3102 os::unmap_memory(extra_base, extra_size);
3103 } else {
3104 os::release_memory(extra_base, extra_size);
3105 }
3106
3107 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3108
3109 } while (aligned_base == NULL);
3110
3111 return aligned_base;
3112 }
3113
3114 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3115 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3116 "reserve alignment");
3117 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3118 char* res;
3119 // note that if UseLargePages is on, all the areas that require interleaving
3120 // will go thru reserve_memory_special rather than thru here.
3121 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3122 if (!use_individual) {
3123 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3124 } else {
3125 elapsedTimer reserveTimer;
3126 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3127 // in numa interleaving, we have to allocate pages individually
3128 // (well really chunks of NUMAInterleaveGranularity size)
3129 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3130 if (res == NULL) {
3131 warning("NUMA page allocation failed");
3132 }
3133 if (Verbose && PrintMiscellaneous) {
3134 reserveTimer.stop();
3135 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3136 reserveTimer.milliseconds(), reserveTimer.ticks());
3137 }
3138 }
3139 assert(res == NULL || addr == NULL || addr == res,
3140 "Unexpected address from reserve.");
3141
3142 return res;
3143 }
3144
3145 // Reserve memory at an arbitrary address, only if that area is
3146 // available (and not reserved for something else).
3147 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3148 // Windows os::reserve_memory() fails of the requested address range is
3149 // not avilable.
3150 return reserve_memory(bytes, requested_addr);
3151 }
3152
3153 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3154 assert(file_desc >= 0, "file_desc is not valid");
3155 return map_memory_to_file(requested_addr, bytes, file_desc);
3156 }
3157
3158 size_t os::large_page_size() {
3159 return _large_page_size;
3160 }
3161
3162 bool os::can_commit_large_page_memory() {
3163 // Windows only uses large page memory when the entire region is reserved
3164 // and committed in a single VirtualAlloc() call. This may change in the
3165 // future, but with Windows 2003 it's not possible to commit on demand.
3166 return false;
3167 }
3168
3169 bool os::can_execute_large_page_memory() {
3170 return true;
3171 }
3172
3173 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3174 bool exec) {
3175 assert(UseLargePages, "only for large pages");
3176
3177 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3178 return NULL; // Fallback to small pages.
3179 }
3180
3181 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3182 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3183
3184 // with large pages, there are two cases where we need to use Individual Allocation
3185 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3186 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3187 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3188 log_debug(pagesize)("Reserving large pages individually.");
3189
3190 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3191 if (p_buf == NULL) {
3192 // give an appropriate warning message
3193 if (UseNUMAInterleaving) {
3194 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3195 }
3196 if (UseLargePagesIndividualAllocation) {
3197 warning("Individually allocated large pages failed, "
3198 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3199 }
3200 return NULL;
3201 }
3202
3203 return p_buf;
3204
3205 } else {
3206 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3207
3208 // normal policy just allocate it all at once
3209 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3210 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3211 if (res != NULL) {
3212 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3213 }
3214
3215 return res;
3216 }
3217 }
3218
3219 bool os::release_memory_special(char* base, size_t bytes) {
3220 assert(base != NULL, "Sanity check");
3221 return release_memory(base, bytes);
3222 }
3223
3224 void os::print_statistics() {
3225 }
3226
3227 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3228 int err = os::get_last_error();
3229 char buf[256];
3230 size_t buf_len = os::lasterror(buf, sizeof(buf));
3231 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3232 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3233 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3234 }
3235
3236 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3237 if (bytes == 0) {
3238 // Don't bother the OS with noops.
3239 return true;
3240 }
3241 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3242 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3243 // Don't attempt to print anything if the OS call fails. We're
3244 // probably low on resources, so the print itself may cause crashes.
3245
3246 // unless we have NUMAInterleaving enabled, the range of a commit
3247 // is always within a reserve covered by a single VirtualAlloc
3248 // in that case we can just do a single commit for the requested size
3249 if (!UseNUMAInterleaving) {
3250 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3251 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3252 return false;
3253 }
3254 if (exec) {
3255 DWORD oldprot;
3256 // Windows doc says to use VirtualProtect to get execute permissions
3257 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3258 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3259 return false;
3260 }
3261 }
3262 return true;
3263 } else {
3264
3265 // when NUMAInterleaving is enabled, the commit might cover a range that
3266 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3267 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3268 // returns represents the number of bytes that can be committed in one step.
3269 size_t bytes_remaining = bytes;
3270 char * next_alloc_addr = addr;
3271 while (bytes_remaining > 0) {
3272 MEMORY_BASIC_INFORMATION alloc_info;
3273 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3274 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3275 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3276 PAGE_READWRITE) == NULL) {
3277 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3278 exec);)
3279 return false;
3280 }
3281 if (exec) {
3282 DWORD oldprot;
3283 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3284 PAGE_EXECUTE_READWRITE, &oldprot)) {
3285 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3286 exec);)
3287 return false;
3288 }
3289 }
3290 bytes_remaining -= bytes_to_rq;
3291 next_alloc_addr += bytes_to_rq;
3292 }
3293 }
3294 // if we made it this far, return true
3295 return true;
3296 }
3297
3298 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3299 bool exec) {
3300 // alignment_hint is ignored on this OS
3301 return pd_commit_memory(addr, size, exec);
3302 }
3303
3304 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3305 const char* mesg) {
3306 assert(mesg != NULL, "mesg must be specified");
3307 if (!pd_commit_memory(addr, size, exec)) {
3308 warn_fail_commit_memory(addr, size, exec);
3309 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3310 }
3311 }
3312
3313 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3314 size_t alignment_hint, bool exec,
3315 const char* mesg) {
3316 // alignment_hint is ignored on this OS
3317 pd_commit_memory_or_exit(addr, size, exec, mesg);
3318 }
3319
3320 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3321 if (bytes == 0) {
3322 // Don't bother the OS with noops.
3323 return true;
3324 }
3325 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3326 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3327 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3328 }
3329
3330 bool os::pd_release_memory(char* addr, size_t bytes) {
3331 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3332 }
3333
3334 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3335 return os::commit_memory(addr, size, !ExecMem);
3336 }
3337
3338 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3339 return os::uncommit_memory(addr, size);
3340 }
3341
3342 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3343 uint count = 0;
3344 bool ret = false;
3345 size_t bytes_remaining = bytes;
3346 char * next_protect_addr = addr;
3347
3348 // Use VirtualQuery() to get the chunk size.
3349 while (bytes_remaining) {
3350 MEMORY_BASIC_INFORMATION alloc_info;
3351 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3352 return false;
3353 }
3354
3355 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3356 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3357 // but we don't distinguish here as both cases are protected by same API.
3358 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3359 warning("Failed protecting pages individually for chunk #%u", count);
3360 if (!ret) {
3361 return false;
3362 }
3363
3364 bytes_remaining -= bytes_to_protect;
3365 next_protect_addr += bytes_to_protect;
3366 count++;
3367 }
3368 return ret;
3369 }
3370
3371 // Set protections specified
3372 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3373 bool is_committed) {
3374 unsigned int p = 0;
3375 switch (prot) {
3376 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3377 case MEM_PROT_READ: p = PAGE_READONLY; break;
3378 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3379 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3380 default:
3381 ShouldNotReachHere();
3382 }
3383
3384 DWORD old_status;
3385
3386 // Strange enough, but on Win32 one can change protection only for committed
3387 // memory, not a big deal anyway, as bytes less or equal than 64K
3388 if (!is_committed) {
3389 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3390 "cannot commit protection page");
3391 }
3392 // One cannot use os::guard_memory() here, as on Win32 guard page
3393 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3394 //
3395 // Pages in the region become guard pages. Any attempt to access a guard page
3396 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3397 // the guard page status. Guard pages thus act as a one-time access alarm.
3398 bool ret;
3399 if (UseNUMAInterleaving) {
3400 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3401 // so we must protect the chunks individually.
3402 ret = protect_pages_individually(addr, bytes, p, &old_status);
3403 } else {
3404 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3405 }
3406 #ifdef ASSERT
3407 if (!ret) {
3408 int err = os::get_last_error();
3409 char buf[256];
3410 size_t buf_len = os::lasterror(buf, sizeof(buf));
3411 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3412 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3413 buf_len != 0 ? buf : "<no_error_string>", err);
3414 }
3415 #endif
3416 return ret;
3417 }
3418
3419 bool os::guard_memory(char* addr, size_t bytes) {
3420 DWORD old_status;
3421 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3422 }
3423
3424 bool os::unguard_memory(char* addr, size_t bytes) {
3425 DWORD old_status;
3426 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3427 }
3428
3429 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3430 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3431 void os::numa_make_global(char *addr, size_t bytes) { }
3432 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3433 bool os::numa_topology_changed() { return false; }
3434 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3435 int os::numa_get_group_id() { return 0; }
3436 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3437 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3438 // Provide an answer for UMA systems
3439 ids[0] = 0;
3440 return 1;
3441 } else {
3442 // check for size bigger than actual groups_num
3443 size = MIN2(size, numa_get_groups_num());
3444 for (int i = 0; i < (int)size; i++) {
3445 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3446 }
3447 return size;
3448 }
3449 }
3450
3451 bool os::get_page_info(char *start, page_info* info) {
3452 return false;
3453 }
3454
3455 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3456 page_info* page_found) {
3457 return end;
3458 }
3459
3460 char* os::non_memory_address_word() {
3461 // Must never look like an address returned by reserve_memory,
3462 // even in its subfields (as defined by the CPU immediate fields,
3463 // if the CPU splits constants across multiple instructions).
3464 return (char*)-1;
3465 }
3466
3467 #define MAX_ERROR_COUNT 100
3468 #define SYS_THREAD_ERROR 0xffffffffUL
3469
3470 void os::pd_start_thread(Thread* thread) {
3471 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3472 // Returns previous suspend state:
3473 // 0: Thread was not suspended
3474 // 1: Thread is running now
3475 // >1: Thread is still suspended.
3476 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3477 }
3478
3479 class HighResolutionInterval : public CHeapObj<mtThread> {
3480 // The default timer resolution seems to be 10 milliseconds.
3481 // (Where is this written down?)
3482 // If someone wants to sleep for only a fraction of the default,
3483 // then we set the timer resolution down to 1 millisecond for
3484 // the duration of their interval.
3485 // We carefully set the resolution back, since otherwise we
3486 // seem to incur an overhead (3%?) that we don't need.
3487 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3488 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3489 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3490 // timeBeginPeriod() if the relative error exceeded some threshold.
3491 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3492 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3493 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3494 // resolution timers running.
3495 private:
3496 jlong resolution;
3497 public:
3498 HighResolutionInterval(jlong ms) {
3499 resolution = ms % 10L;
3500 if (resolution != 0) {
3501 MMRESULT result = timeBeginPeriod(1L);
3502 }
3503 }
3504 ~HighResolutionInterval() {
3505 if (resolution != 0) {
3506 MMRESULT result = timeEndPeriod(1L);
3507 }
3508 resolution = 0L;
3509 }
3510 };
3511
3512 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3513 jlong limit = (jlong) MAXDWORD;
3514
3515 while (ms > limit) {
3516 int res;
3517 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3518 return res;
3519 }
3520 ms -= limit;
3521 }
3522
3523 assert(thread == Thread::current(), "thread consistency check");
3524 OSThread* osthread = thread->osthread();
3525 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3526 int result;
3527 if (interruptable) {
3528 assert(thread->is_Java_thread(), "must be java thread");
3529 JavaThread *jt = (JavaThread *) thread;
3530 ThreadBlockInVM tbivm(jt);
3531
3532 jt->set_suspend_equivalent();
3533 // cleared by handle_special_suspend_equivalent_condition() or
3534 // java_suspend_self() via check_and_wait_while_suspended()
3535
3536 HANDLE events[1];
3537 events[0] = osthread->interrupt_event();
3538 HighResolutionInterval *phri=NULL;
3539 if (!ForceTimeHighResolution) {
3540 phri = new HighResolutionInterval(ms);
3541 }
3542 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3543 result = OS_TIMEOUT;
3544 } else {
3545 ResetEvent(osthread->interrupt_event());
3546 osthread->set_interrupted(false);
3547 result = OS_INTRPT;
3548 }
3549 delete phri; //if it is NULL, harmless
3550
3551 // were we externally suspended while we were waiting?
3552 jt->check_and_wait_while_suspended();
3553 } else {
3554 assert(!thread->is_Java_thread(), "must not be java thread");
3555 Sleep((long) ms);
3556 result = OS_TIMEOUT;
3557 }
3558 return result;
3559 }
3560
3561 // Short sleep, direct OS call.
3562 //
3563 // ms = 0, means allow others (if any) to run.
3564 //
3565 void os::naked_short_sleep(jlong ms) {
3566 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3567 Sleep(ms);
3568 }
3569
3570 // Windows does not provide sleep functionality with nanosecond resolution, so we
3571 // try to approximate this with spinning combined with yielding if another thread
3572 // is ready to run on the current processor.
3573 void os::naked_short_nanosleep(jlong ns) {
3574 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3575
3576 int64_t start = os::javaTimeNanos();
3577 do {
3578 if (SwitchToThread() == 0) {
3579 // Nothing else is ready to run on this cpu, spin a little
3580 SpinPause();
3581 }
3582 } while (os::javaTimeNanos() - start < ns);
3583 }
3584
3585 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3586 void os::infinite_sleep() {
3587 while (true) { // sleep forever ...
3588 Sleep(100000); // ... 100 seconds at a time
3589 }
3590 }
3591
3592 typedef BOOL (WINAPI * STTSignature)(void);
3593
3594 void os::naked_yield() {
3595 // Consider passing back the return value from SwitchToThread().
3596 SwitchToThread();
3597 }
3598
3599 // Win32 only gives you access to seven real priorities at a time,
3600 // so we compress Java's ten down to seven. It would be better
3601 // if we dynamically adjusted relative priorities.
3602
3603 int os::java_to_os_priority[CriticalPriority + 1] = {
3604 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3605 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3606 THREAD_PRIORITY_LOWEST, // 2
3607 THREAD_PRIORITY_BELOW_NORMAL, // 3
3608 THREAD_PRIORITY_BELOW_NORMAL, // 4
3609 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3610 THREAD_PRIORITY_NORMAL, // 6
3611 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3612 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3613 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3614 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3615 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3616 };
3617
3618 int prio_policy1[CriticalPriority + 1] = {
3619 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3620 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3621 THREAD_PRIORITY_LOWEST, // 2
3622 THREAD_PRIORITY_BELOW_NORMAL, // 3
3623 THREAD_PRIORITY_BELOW_NORMAL, // 4
3624 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3625 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3626 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3627 THREAD_PRIORITY_HIGHEST, // 8
3628 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3629 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3630 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3631 };
3632
3633 static int prio_init() {
3634 // If ThreadPriorityPolicy is 1, switch tables
3635 if (ThreadPriorityPolicy == 1) {
3636 int i;
3637 for (i = 0; i < CriticalPriority + 1; i++) {
3638 os::java_to_os_priority[i] = prio_policy1[i];
3639 }
3640 }
3641 if (UseCriticalJavaThreadPriority) {
3642 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3643 }
3644 return 0;
3645 }
3646
3647 OSReturn os::set_native_priority(Thread* thread, int priority) {
3648 if (!UseThreadPriorities) return OS_OK;
3649 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3650 return ret ? OS_OK : OS_ERR;
3651 }
3652
3653 OSReturn os::get_native_priority(const Thread* const thread,
3654 int* priority_ptr) {
3655 if (!UseThreadPriorities) {
3656 *priority_ptr = java_to_os_priority[NormPriority];
3657 return OS_OK;
3658 }
3659 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3660 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3661 assert(false, "GetThreadPriority failed");
3662 return OS_ERR;
3663 }
3664 *priority_ptr = os_prio;
3665 return OS_OK;
3666 }
3667
3668 void os::interrupt(Thread* thread) {
3669 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3670
3671 OSThread* osthread = thread->osthread();
3672 osthread->set_interrupted(true);
3673 // More than one thread can get here with the same value of osthread,
3674 // resulting in multiple notifications. We do, however, want the store
3675 // to interrupted() to be visible to other threads before we post
3676 // the interrupt event.
3677 OrderAccess::release();
3678 SetEvent(osthread->interrupt_event());
3679 // For JSR166: unpark after setting status
3680 if (thread->is_Java_thread()) {
3681 ((JavaThread*)thread)->parker()->unpark();
3682 }
3683
3684 ParkEvent * ev = thread->_ParkEvent;
3685 if (ev != NULL) ev->unpark();
3686 }
3687
3688
3689 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3690 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3691
3692 OSThread* osthread = thread->osthread();
3693 // There is no synchronization between the setting of the interrupt
3694 // and it being cleared here. It is critical - see 6535709 - that
3695 // we only clear the interrupt state, and reset the interrupt event,
3696 // if we are going to report that we were indeed interrupted - else
3697 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3698 // depending on the timing. By checking thread interrupt event to see
3699 // if the thread gets real interrupt thus prevent spurious wakeup.
3700 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3701 if (interrupted && clear_interrupted) {
3702 osthread->set_interrupted(false);
3703 ResetEvent(osthread->interrupt_event());
3704 } // Otherwise leave the interrupted state alone
3705
3706 return interrupted;
3707 }
3708
3709 // GetCurrentThreadId() returns DWORD
3710 intx os::current_thread_id() { return GetCurrentThreadId(); }
3711
3712 static int _initial_pid = 0;
3713
3714 int os::current_process_id() {
3715 return (_initial_pid ? _initial_pid : _getpid());
3716 }
3717
3718 int os::win32::_vm_page_size = 0;
3719 int os::win32::_vm_allocation_granularity = 0;
3720 int os::win32::_processor_type = 0;
3721 // Processor level is not available on non-NT systems, use vm_version instead
3722 int os::win32::_processor_level = 0;
3723 julong os::win32::_physical_memory = 0;
3724 size_t os::win32::_default_stack_size = 0;
3725
3726 intx os::win32::_os_thread_limit = 0;
3727 volatile intx os::win32::_os_thread_count = 0;
3728
3729 bool os::win32::_is_windows_server = false;
3730
3731 // 6573254
3732 // Currently, the bug is observed across all the supported Windows releases,
3733 // including the latest one (as of this writing - Windows Server 2012 R2)
3734 bool os::win32::_has_exit_bug = true;
3735
3736 void os::win32::initialize_system_info() {
3737 SYSTEM_INFO si;
3738 GetSystemInfo(&si);
3739 _vm_page_size = si.dwPageSize;
3740 _vm_allocation_granularity = si.dwAllocationGranularity;
3741 _processor_type = si.dwProcessorType;
3742 _processor_level = si.wProcessorLevel;
3743 set_processor_count(si.dwNumberOfProcessors);
3744
3745 MEMORYSTATUSEX ms;
3746 ms.dwLength = sizeof(ms);
3747
3748 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3749 // dwMemoryLoad (% of memory in use)
3750 GlobalMemoryStatusEx(&ms);
3751 _physical_memory = ms.ullTotalPhys;
3752
3753 if (FLAG_IS_DEFAULT(MaxRAM)) {
3754 // Adjust MaxRAM according to the maximum virtual address space available.
3755 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3756 }
3757
3758 OSVERSIONINFOEX oi;
3759 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3760 GetVersionEx((OSVERSIONINFO*)&oi);
3761 switch (oi.dwPlatformId) {
3762 case VER_PLATFORM_WIN32_NT:
3763 {
3764 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3765 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3766 oi.wProductType == VER_NT_SERVER) {
3767 _is_windows_server = true;
3768 }
3769 }
3770 break;
3771 default: fatal("Unknown platform");
3772 }
3773
3774 _default_stack_size = os::current_stack_size();
3775 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3776 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3777 "stack size not a multiple of page size");
3778
3779 initialize_performance_counter();
3780 }
3781
3782
3783 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3784 int ebuflen) {
3785 char path[MAX_PATH];
3786 DWORD size;
3787 DWORD pathLen = (DWORD)sizeof(path);
3788 HINSTANCE result = NULL;
3789
3790 // only allow library name without path component
3791 assert(strchr(name, '\\') == NULL, "path not allowed");
3792 assert(strchr(name, ':') == NULL, "path not allowed");
3793 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3794 jio_snprintf(ebuf, ebuflen,
3795 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3796 return NULL;
3797 }
3798
3799 // search system directory
3800 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3801 if (size >= pathLen) {
3802 return NULL; // truncated
3803 }
3804 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3805 return NULL; // truncated
3806 }
3807 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3808 return result;
3809 }
3810 }
3811
3812 // try Windows directory
3813 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3814 if (size >= pathLen) {
3815 return NULL; // truncated
3816 }
3817 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3818 return NULL; // truncated
3819 }
3820 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3821 return result;
3822 }
3823 }
3824
3825 jio_snprintf(ebuf, ebuflen,
3826 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3827 return NULL;
3828 }
3829
3830 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3831 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3832
3833 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3834 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3835 return TRUE;
3836 }
3837
3838 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3839 // Basic approach:
3840 // - Each exiting thread registers its intent to exit and then does so.
3841 // - A thread trying to terminate the process must wait for all
3842 // threads currently exiting to complete their exit.
3843
3844 if (os::win32::has_exit_bug()) {
3845 // The array holds handles of the threads that have started exiting by calling
3846 // _endthreadex().
3847 // Should be large enough to avoid blocking the exiting thread due to lack of
3848 // a free slot.
3849 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3850 static int handle_count = 0;
3851
3852 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3853 static CRITICAL_SECTION crit_sect;
3854 static volatile DWORD process_exiting = 0;
3855 int i, j;
3856 DWORD res;
3857 HANDLE hproc, hthr;
3858
3859 // We only attempt to register threads until a process exiting
3860 // thread manages to set the process_exiting flag. Any threads
3861 // that come through here after the process_exiting flag is set
3862 // are unregistered and will be caught in the SuspendThread()
3863 // infinite loop below.
3864 bool registered = false;
3865
3866 // The first thread that reached this point, initializes the critical section.
3867 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3868 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3869 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3870 if (what != EPT_THREAD) {
3871 // Atomically set process_exiting before the critical section
3872 // to increase the visibility between racing threads.
3873 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3874 }
3875 EnterCriticalSection(&crit_sect);
3876
3877 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3878 // Remove from the array those handles of the threads that have completed exiting.
3879 for (i = 0, j = 0; i < handle_count; ++i) {
3880 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3881 if (res == WAIT_TIMEOUT) {
3882 handles[j++] = handles[i];
3883 } else {
3884 if (res == WAIT_FAILED) {
3885 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3886 GetLastError(), __FILE__, __LINE__);
3887 }
3888 // Don't keep the handle, if we failed waiting for it.
3889 CloseHandle(handles[i]);
3890 }
3891 }
3892
3893 // If there's no free slot in the array of the kept handles, we'll have to
3894 // wait until at least one thread completes exiting.
3895 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3896 // Raise the priority of the oldest exiting thread to increase its chances
3897 // to complete sooner.
3898 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3899 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3900 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3901 i = (res - WAIT_OBJECT_0);
3902 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3903 for (; i < handle_count; ++i) {
3904 handles[i] = handles[i + 1];
3905 }
3906 } else {
3907 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3908 (res == WAIT_FAILED ? "failed" : "timed out"),
3909 GetLastError(), __FILE__, __LINE__);
3910 // Don't keep handles, if we failed waiting for them.
3911 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3912 CloseHandle(handles[i]);
3913 }
3914 handle_count = 0;
3915 }
3916 }
3917
3918 // Store a duplicate of the current thread handle in the array of handles.
3919 hproc = GetCurrentProcess();
3920 hthr = GetCurrentThread();
3921 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3922 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3923 warning("DuplicateHandle failed (%u) in %s: %d\n",
3924 GetLastError(), __FILE__, __LINE__);
3925
3926 // We can't register this thread (no more handles) so this thread
3927 // may be racing with a thread that is calling exit(). If the thread
3928 // that is calling exit() has managed to set the process_exiting
3929 // flag, then this thread will be caught in the SuspendThread()
3930 // infinite loop below which closes that race. A small timing
3931 // window remains before the process_exiting flag is set, but it
3932 // is only exposed when we are out of handles.
3933 } else {
3934 ++handle_count;
3935 registered = true;
3936
3937 // The current exiting thread has stored its handle in the array, and now
3938 // should leave the critical section before calling _endthreadex().
3939 }
3940
3941 } else if (what != EPT_THREAD && handle_count > 0) {
3942 jlong start_time, finish_time, timeout_left;
3943 // Before ending the process, make sure all the threads that had called
3944 // _endthreadex() completed.
3945
3946 // Set the priority level of the current thread to the same value as
3947 // the priority level of exiting threads.
3948 // This is to ensure it will be given a fair chance to execute if
3949 // the timeout expires.
3950 hthr = GetCurrentThread();
3951 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3952 start_time = os::javaTimeNanos();
3953 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3954 for (i = 0; ; ) {
3955 int portion_count = handle_count - i;
3956 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3957 portion_count = MAXIMUM_WAIT_OBJECTS;
3958 }
3959 for (j = 0; j < portion_count; ++j) {
3960 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3961 }
3962 timeout_left = (finish_time - start_time) / 1000000L;
3963 if (timeout_left < 0) {
3964 timeout_left = 0;
3965 }
3966 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3967 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3968 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3969 (res == WAIT_FAILED ? "failed" : "timed out"),
3970 GetLastError(), __FILE__, __LINE__);
3971 // Reset portion_count so we close the remaining
3972 // handles due to this error.
3973 portion_count = handle_count - i;
3974 }
3975 for (j = 0; j < portion_count; ++j) {
3976 CloseHandle(handles[i + j]);
3977 }
3978 if ((i += portion_count) >= handle_count) {
3979 break;
3980 }
3981 start_time = os::javaTimeNanos();
3982 }
3983 handle_count = 0;
3984 }
3985
3986 LeaveCriticalSection(&crit_sect);
3987 }
3988
3989 if (!registered &&
3990 OrderAccess::load_acquire(&process_exiting) != 0 &&
3991 process_exiting != GetCurrentThreadId()) {
3992 // Some other thread is about to call exit(), so we don't let
3993 // the current unregistered thread proceed to exit() or _endthreadex()
3994 while (true) {
3995 SuspendThread(GetCurrentThread());
3996 // Avoid busy-wait loop, if SuspendThread() failed.
3997 Sleep(EXIT_TIMEOUT);
3998 }
3999 }
4000 }
4001
4002 // We are here if either
4003 // - there's no 'race at exit' bug on this OS release;
4004 // - initialization of the critical section failed (unlikely);
4005 // - the current thread has registered itself and left the critical section;
4006 // - the process-exiting thread has raised the flag and left the critical section.
4007 if (what == EPT_THREAD) {
4008 _endthreadex((unsigned)exit_code);
4009 } else if (what == EPT_PROCESS) {
4010 ::exit(exit_code);
4011 } else {
4012 _exit(exit_code);
4013 }
4014
4015 // Should not reach here
4016 return exit_code;
4017 }
4018
4019 #undef EXIT_TIMEOUT
4020
4021 void os::win32::setmode_streams() {
4022 _setmode(_fileno(stdin), _O_BINARY);
4023 _setmode(_fileno(stdout), _O_BINARY);
4024 _setmode(_fileno(stderr), _O_BINARY);
4025 }
4026
4027
4028 bool os::is_debugger_attached() {
4029 return IsDebuggerPresent() ? true : false;
4030 }
4031
4032
4033 void os::wait_for_keypress_at_exit(void) {
4034 if (PauseAtExit) {
4035 fprintf(stderr, "Press any key to continue...\n");
4036 fgetc(stdin);
4037 }
4038 }
4039
4040
4041 bool os::message_box(const char* title, const char* message) {
4042 int result = MessageBox(NULL, message, title,
4043 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4044 return result == IDYES;
4045 }
4046
4047 #ifndef PRODUCT
4048 #ifndef _WIN64
4049 // Helpers to check whether NX protection is enabled
4050 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4051 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4052 pex->ExceptionRecord->NumberParameters > 0 &&
4053 pex->ExceptionRecord->ExceptionInformation[0] ==
4054 EXCEPTION_INFO_EXEC_VIOLATION) {
4055 return EXCEPTION_EXECUTE_HANDLER;
4056 }
4057 return EXCEPTION_CONTINUE_SEARCH;
4058 }
4059
4060 void nx_check_protection() {
4061 // If NX is enabled we'll get an exception calling into code on the stack
4062 char code[] = { (char)0xC3 }; // ret
4063 void *code_ptr = (void *)code;
4064 __try {
4065 __asm call code_ptr
4066 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4067 tty->print_raw_cr("NX protection detected.");
4068 }
4069 }
4070 #endif // _WIN64
4071 #endif // PRODUCT
4072
4073 // This is called _before_ the global arguments have been parsed
4074 void os::init(void) {
4075 _initial_pid = _getpid();
4076
4077 init_random(1234567);
4078
4079 win32::initialize_system_info();
4080 win32::setmode_streams();
4081 init_page_sizes((size_t) win32::vm_page_size());
4082
4083 // This may be overridden later when argument processing is done.
4084 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
4085
4086 // Initialize main_process and main_thread
4087 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4088 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4089 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4090 fatal("DuplicateHandle failed\n");
4091 }
4092 main_thread_id = (int) GetCurrentThreadId();
4093
4094 // initialize fast thread access - only used for 32-bit
4095 win32::initialize_thread_ptr_offset();
4096 }
4097
4098 // To install functions for atexit processing
4099 extern "C" {
4100 static void perfMemory_exit_helper() {
4101 perfMemory_exit();
4102 }
4103 }
4104
4105 static jint initSock();
4106
4107 // this is called _after_ the global arguments have been parsed
4108 jint os::init_2(void) {
4109
4110 // This could be set any time but all platforms
4111 // have to set it the same so we have to mirror Solaris.
4112 DEBUG_ONLY(os::set_mutex_init_done();)
4113
4114 // Setup Windows Exceptions
4115
4116 #if INCLUDE_AOT
4117 // If AOT is enabled we need to install a vectored exception handler
4118 // in order to forward implicit exceptions from code in AOT
4119 // generated DLLs. This is necessary since these DLLs are not
4120 // registered for structured exceptions like codecache methods are.
4121 if (UseAOT) {
4122 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4123 }
4124 #endif
4125
4126 // for debugging float code generation bugs
4127 if (ForceFloatExceptions) {
4128 #ifndef _WIN64
4129 static long fp_control_word = 0;
4130 __asm { fstcw fp_control_word }
4131 // see Intel PPro Manual, Vol. 2, p 7-16
4132 const long precision = 0x20;
4133 const long underflow = 0x10;
4134 const long overflow = 0x08;
4135 const long zero_div = 0x04;
4136 const long denorm = 0x02;
4137 const long invalid = 0x01;
4138 fp_control_word |= invalid;
4139 __asm { fldcw fp_control_word }
4140 #endif
4141 }
4142
4143 // If stack_commit_size is 0, windows will reserve the default size,
4144 // but only commit a small portion of it.
4145 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4146 size_t default_reserve_size = os::win32::default_stack_size();
4147 size_t actual_reserve_size = stack_commit_size;
4148 if (stack_commit_size < default_reserve_size) {
4149 // If stack_commit_size == 0, we want this too
4150 actual_reserve_size = default_reserve_size;
4151 }
4152
4153 // Check minimum allowable stack size for thread creation and to initialize
4154 // the java system classes, including StackOverflowError - depends on page
4155 // size. Add two 4K pages for compiler2 recursion in main thread.
4156 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4157 // class initialization depending on 32 or 64 bit VM.
4158 size_t min_stack_allowed =
4159 (size_t)(JavaThread::stack_guard_zone_size() +
4160 JavaThread::stack_shadow_zone_size() +
4161 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4162
4163 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4164
4165 if (actual_reserve_size < min_stack_allowed) {
4166 tty->print_cr("\nThe Java thread stack size specified is too small. "
4167 "Specify at least %dk",
4168 min_stack_allowed / K);
4169 return JNI_ERR;
4170 }
4171
4172 JavaThread::set_stack_size_at_create(stack_commit_size);
4173
4174 // Calculate theoretical max. size of Threads to guard gainst artifical
4175 // out-of-memory situations, where all available address-space has been
4176 // reserved by thread stacks.
4177 assert(actual_reserve_size != 0, "Must have a stack");
4178
4179 // Calculate the thread limit when we should start doing Virtual Memory
4180 // banging. Currently when the threads will have used all but 200Mb of space.
4181 //
4182 // TODO: consider performing a similar calculation for commit size instead
4183 // as reserve size, since on a 64-bit platform we'll run into that more
4184 // often than running out of virtual memory space. We can use the
4185 // lower value of the two calculations as the os_thread_limit.
4186 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4187 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4188
4189 // at exit methods are called in the reverse order of their registration.
4190 // there is no limit to the number of functions registered. atexit does
4191 // not set errno.
4192
4193 if (PerfAllowAtExitRegistration) {
4194 // only register atexit functions if PerfAllowAtExitRegistration is set.
4195 // atexit functions can be delayed until process exit time, which
4196 // can be problematic for embedded VM situations. Embedded VMs should
4197 // call DestroyJavaVM() to assure that VM resources are released.
4198
4199 // note: perfMemory_exit_helper atexit function may be removed in
4200 // the future if the appropriate cleanup code can be added to the
4201 // VM_Exit VMOperation's doit method.
4202 if (atexit(perfMemory_exit_helper) != 0) {
4203 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4204 }
4205 }
4206
4207 #ifndef _WIN64
4208 // Print something if NX is enabled (win32 on AMD64)
4209 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4210 #endif
4211
4212 // initialize thread priority policy
4213 prio_init();
4214
4215 if (UseNUMA && !ForceNUMA) {
4216 UseNUMA = false; // We don't fully support this yet
4217 }
4218
4219 if (UseNUMAInterleaving) {
4220 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4221 bool success = numa_interleaving_init();
4222 if (!success) UseNUMAInterleaving = false;
4223 }
4224
4225 if (initSock() != JNI_OK) {
4226 return JNI_ERR;
4227 }
4228
4229 SymbolEngine::recalc_search_path();
4230
4231 // Initialize data for jdk.internal.misc.Signal
4232 if (!ReduceSignalUsage) {
4233 jdk_misc_signal_init();
4234 }
4235
4236 return JNI_OK;
4237 }
4238
4239 // Mark the polling page as unreadable
4240 void os::make_polling_page_unreadable(void) {
4241 DWORD old_status;
4242 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4243 PAGE_NOACCESS, &old_status)) {
4244 fatal("Could not disable polling page");
4245 }
4246 }
4247
4248 // Mark the polling page as readable
4249 void os::make_polling_page_readable(void) {
4250 DWORD old_status;
4251 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4252 PAGE_READONLY, &old_status)) {
4253 fatal("Could not enable polling page");
4254 }
4255 }
4256
4257 // combine the high and low DWORD into a ULONGLONG
4258 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4259 ULONGLONG value = high_word;
4260 value <<= sizeof(high_word) * 8;
4261 value |= low_word;
4262 return value;
4263 }
4264
4265 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4266 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4267 ::memset((void*)sbuf, 0, sizeof(struct stat));
4268 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4269 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4270 file_data.ftLastWriteTime.dwLowDateTime);
4271 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4272 file_data.ftCreationTime.dwLowDateTime);
4273 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4274 file_data.ftLastAccessTime.dwLowDateTime);
4275 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4276 sbuf->st_mode |= S_IFDIR;
4277 } else {
4278 sbuf->st_mode |= S_IFREG;
4279 }
4280 }
4281
4282 // Returns the given path as an absolute wide path in unc format.The returned path is NULL
4283 // on error (with er being set accordingly) and should be freed via os::free() otherwise.
4284 // additional_space is the number of additionally allocated wchars after the terminating L'\0'.
4285 static wchar_t* wide_abs_unc_path(char const* path, errno_t & err, int additional_space = 0) {
4286 if (path == NULL) {
4287 err = ENOENT;
4288 return NULL;
4289 }
4290
4291 size_t path_len = strlen(path);
4292 // Need to allocate at least room for 3 characters, since os::native_path transforms C: to C:.
4293 char* buf = (char*) os::malloc(1 + MAX2((size_t) 3, path_len), mtInternal);
4294 wchar_t* result = NULL;
4295
4296 if (buf == NULL) {
4297 err = ENOMEM;
4298 } else {
4299 memcpy(buf, path, path_len + 1);
4300 os::native_path(buf);
4301
4302 wchar_t* prefix;
4303 int prefix_off = 0;
4304 bool is_abs = true;
4305 bool needs_fullpath = true;
4306
4307 if (::isalpha(buf[0]) && !::IsDBCSLeadByte(buf[0]) && buf[1] == ':' && buf[2] == '\\') {
4308 prefix = L"\\\\?\\";
4309 } else if (buf[0] == '\\' && buf[1] == '\\') {
4310 assert(buf[2] != '\\');
4311
4312 if (buf[2] == '?' && buf[3] == '\\') {
4313 prefix = L"";
4314 needs_fullpath = false;
4315 } else {
4316 prefix = L"\\\\?\\UNC";
4317 prefix_off = 1; // Overwrite the first char with the prefix.
4318 }
4319 } else {
4320 is_abs = false;
4321 prefix = L"\\\\?\\";
4322 }
4323
4324 size_t buf_len = strlen(buf);
4325 size_t prefix_len = wcslen(prefix);
4326 size_t full_path_size = is_abs ? 1 + buf_len : JVM_MAXPATHLEN;
4327 size_t result_size = prefix_len + full_path_size - prefix_off;
4328 result = (wchar_t*) os::malloc(sizeof(wchar_t) * (additional_space + result_size), mtInternal);
4329
4330 if (result == NULL) {
4331 err = ENOMEM;
4332 } else {
4333 size_t converted_chars;
4334 wchar_t* path_start = result + prefix_len - prefix_off;
4335 err = ::mbstowcs_s(&converted_chars, path_start, buf_len + 1, buf, buf_len);
4336
4337 if ((err == ERROR_SUCCESS) && needs_fullpath) {
4338 wchar_t* tmp = (wchar_t*) os::malloc(sizeof(wchar_t) * full_path_size, mtInternal);
4339
4340 if (tmp == NULL) {
4341 err = ENOMEM;
4342 } else {
4343 if (!_wfullpath(tmp, path_start, full_path_size)) {
4344 err = ENOENT;
4345 } else {
4346 ::memcpy(path_start, tmp, (1 + wcslen(tmp)) * sizeof(wchar_t));
4347 }
4348
4349 os::free(tmp);
4350 }
4351 }
4352
4353 memcpy(result, prefix, sizeof(wchar_t) * prefix_len);
4354
4355 // Remove trailing pathsep (not for \\?\<DRIVE>:\, since it would make it relative)
4356 size_t result_len = wcslen(result);
4357
4358 if (result[result_len - 1] == L'\\') {
4359 if (!(::iswalpha(result[4]) && result[5] == L':' && result_len == 7)) {
4360 result[result_len - 1] = L'\0';
4361 }
4362 }
4363 }
4364 }
4365
4366 os::free(buf);
4367
4368 if (err != ERROR_SUCCESS) {
4369 os::free(result);
4370 result = NULL;
4371 }
4372
4373 return result;
4374 }
4375
4376 int os::stat(const char *path, struct stat *sbuf) {
4377 errno_t err;
4378 wchar_t* wide_path = wide_abs_unc_path(path, err);
4379
4380 if (wide_path == NULL) {
4381 errno = err;
4382 return -1;
4383 }
4384
4385 WIN32_FILE_ATTRIBUTE_DATA file_data;;
4386 BOOL bret = ::GetFileAttributesExW(wide_path, GetFileExInfoStandard, &file_data);
4387 os::free(wide_path);
4388
4389 if (!bret) {
4390 errno = ::GetLastError();
4391 return -1;
4392 }
4393
4394 file_attribute_data_to_stat(sbuf, file_data);
4395 return 0;
4396 }
4397
4398 static HANDLE create_read_only_file_handle(const char* file) {
4399 errno_t err;
4400 wchar_t* wide_path = wide_abs_unc_path(file, err);
4401
4402 if (wide_path == NULL) {
4403 errno = err;
4404 return INVALID_HANDLE_VALUE;
4405 }
4406
4407 HANDLE handle = ::CreateFileW(wide_path, 0, FILE_SHARE_READ,
4408 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4409 os::free(wide_path);
4410
4411 return handle;
4412 }
4413
4414 bool os::same_files(const char* file1, const char* file2) {
4415
4416 if (file1 == NULL && file2 == NULL) {
4417 return true;
4418 }
4419
4420 if (file1 == NULL || file2 == NULL) {
4421 return false;
4422 }
4423
4424 if (strcmp(file1, file2) == 0) {
4425 return true;
4426 }
4427
4428 HANDLE handle1 = create_read_only_file_handle(file1);
4429 HANDLE handle2 = create_read_only_file_handle(file2);
4430 bool result = false;
4431
4432 // if we could open both paths...
4433 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4434 BY_HANDLE_FILE_INFORMATION fileInfo1;
4435 BY_HANDLE_FILE_INFORMATION fileInfo2;
4436 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4437 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4438 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4439 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4440 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4441 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4442 result = true;
4443 }
4444 }
4445 }
4446
4447 //free the handles
4448 if (handle1 != INVALID_HANDLE_VALUE) {
4449 ::CloseHandle(handle1);
4450 }
4451
4452 if (handle2 != INVALID_HANDLE_VALUE) {
4453 ::CloseHandle(handle2);
4454 }
4455
4456 return result;
4457 }
4458
4459 #define FT2INT64(ft) \
4460 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4461
4462
4463 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4464 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4465 // of a thread.
4466 //
4467 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4468 // the fast estimate available on the platform.
4469
4470 // current_thread_cpu_time() is not optimized for Windows yet
4471 jlong os::current_thread_cpu_time() {
4472 // return user + sys since the cost is the same
4473 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4474 }
4475
4476 jlong os::thread_cpu_time(Thread* thread) {
4477 // consistent with what current_thread_cpu_time() returns.
4478 return os::thread_cpu_time(thread, true /* user+sys */);
4479 }
4480
4481 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4482 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4483 }
4484
4485 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4486 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4487 // If this function changes, os::is_thread_cpu_time_supported() should too
4488 FILETIME CreationTime;
4489 FILETIME ExitTime;
4490 FILETIME KernelTime;
4491 FILETIME UserTime;
4492
4493 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4494 &ExitTime, &KernelTime, &UserTime) == 0) {
4495 return -1;
4496 } else if (user_sys_cpu_time) {
4497 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4498 } else {
4499 return FT2INT64(UserTime) * 100;
4500 }
4501 }
4502
4503 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4504 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4505 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4506 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4507 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4508 }
4509
4510 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4511 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4512 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4513 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4514 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4515 }
4516
4517 bool os::is_thread_cpu_time_supported() {
4518 // see os::thread_cpu_time
4519 FILETIME CreationTime;
4520 FILETIME ExitTime;
4521 FILETIME KernelTime;
4522 FILETIME UserTime;
4523
4524 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4525 &KernelTime, &UserTime) == 0) {
4526 return false;
4527 } else {
4528 return true;
4529 }
4530 }
4531
4532 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4533 // It does have primitives (PDH API) to get CPU usage and run queue length.
4534 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4535 // If we wanted to implement loadavg on Windows, we have a few options:
4536 //
4537 // a) Query CPU usage and run queue length and "fake" an answer by
4538 // returning the CPU usage if it's under 100%, and the run queue
4539 // length otherwise. It turns out that querying is pretty slow
4540 // on Windows, on the order of 200 microseconds on a fast machine.
4541 // Note that on the Windows the CPU usage value is the % usage
4542 // since the last time the API was called (and the first call
4543 // returns 100%), so we'd have to deal with that as well.
4544 //
4545 // b) Sample the "fake" answer using a sampling thread and store
4546 // the answer in a global variable. The call to loadavg would
4547 // just return the value of the global, avoiding the slow query.
4548 //
4549 // c) Sample a better answer using exponential decay to smooth the
4550 // value. This is basically the algorithm used by UNIX kernels.
4551 //
4552 // Note that sampling thread starvation could affect both (b) and (c).
4553 int os::loadavg(double loadavg[], int nelem) {
4554 return -1;
4555 }
4556
4557
4558 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4559 bool os::dont_yield() {
4560 return DontYieldALot;
4561 }
4562
4563 int os::open(const char *path, int oflag, int mode) {
4564 errno_t err;
4565 wchar_t* wide_path = wide_abs_unc_path(path, err);
4566
4567 if (wide_path == NULL) {
4568 errno = err;
4569 return -1;
4570 }
4571 int fd = ::_wopen(wide_path, oflag | O_BINARY | O_NOINHERIT, mode);
4572 os::free(wide_path);
4573
4574 if (fd == -1) {
4575 errno = ::GetLastError();
4576 }
4577
4578 return fd;
4579 }
4580
4581 FILE* os::open(int fd, const char* mode) {
4582 return ::_fdopen(fd, mode);
4583 }
4584
4585 // Is a (classpath) directory empty?
4586 bool os::dir_is_empty(const char* path) {
4587 errno_t err;
4588 wchar_t* wide_path = wide_abs_unc_path(path, err, 2);
4589
4590 if (wide_path == NULL) {
4591 errno = err;
4592 return false;
4593 }
4594
4595 // Make sure we end with "\\*"
4596 if (wide_path[wcslen(wide_path) - 1] == L'\\') {
4597 wcscat(wide_path, L"*");
4598 } else {
4599 wcscat(wide_path, L"\\*");
4600 }
4601
4602 WIN32_FIND_DATAW fd;
4603 HANDLE f = ::FindFirstFileW(wide_path, &fd);
4604 os::free(wide_path);
4605 bool is_empty = true;
4606
4607 if (f != INVALID_HANDLE_VALUE) {
4608 while (is_empty && ::FindNextFileW(f, &fd)) {
4609 // An empty directory contains only the current directory file
4610 // and the previous directory file.
4611 if ((wcscmp(fd.cFileName, L".") != 0) &&
4612 (wcscmp(fd.cFileName, L"..") != 0)) {
4613 is_empty = false;
4614 }
4615 }
4616 FindClose(f);
4617 } else {
4618 errno = ::GetLastError();
4619 }
4620
4621 return is_empty;
4622 }
4623
4624 // create binary file, rewriting existing file if required
4625 int os::create_binary_file(const char* path, bool rewrite_existing) {
4626 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4627 if (!rewrite_existing) {
4628 oflags |= _O_EXCL;
4629 }
4630 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4631 }
4632
4633 // return current position of file pointer
4634 jlong os::current_file_offset(int fd) {
4635 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4636 }
4637
4638 // move file pointer to the specified offset
4639 jlong os::seek_to_file_offset(int fd, jlong offset) {
4640 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4641 }
4642
4643
4644 jlong os::lseek(int fd, jlong offset, int whence) {
4645 return (jlong) ::_lseeki64(fd, offset, whence);
4646 }
4647
4648 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4649 OVERLAPPED ov;
4650 DWORD nread;
4651 BOOL result;
4652
4653 ZeroMemory(&ov, sizeof(ov));
4654 ov.Offset = (DWORD)offset;
4655 ov.OffsetHigh = (DWORD)(offset >> 32);
4656
4657 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4658
4659 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4660
4661 return result ? nread : 0;
4662 }
4663
4664
4665 // This method is a slightly reworked copy of JDK's sysNativePath
4666 // from src/windows/hpi/src/path_md.c
4667
4668 // Convert a pathname to native format. On win32, this involves forcing all
4669 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4670 // sometimes rejects '/') and removing redundant separators. The input path is
4671 // assumed to have been converted into the character encoding used by the local
4672 // system. Because this might be a double-byte encoding, care is taken to
4673 // treat double-byte lead characters correctly.
4674 //
4675 // This procedure modifies the given path in place, as the result is never
4676 // longer than the original. There is no error return; this operation always
4677 // succeeds.
4678 char * os::native_path(char *path) {
4679 char *src = path, *dst = path, *end = path;
4680 char *colon = NULL; // If a drive specifier is found, this will
4681 // point to the colon following the drive letter
4682
4683 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4684 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4685 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4686
4687 // Check for leading separators
4688 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4689 while (isfilesep(*src)) {
4690 src++;
4691 }
4692
4693 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4694 // Remove leading separators if followed by drive specifier. This
4695 // hack is necessary to support file URLs containing drive
4696 // specifiers (e.g., "file://c:/path"). As a side effect,
4697 // "/c:/path" can be used as an alternative to "c:/path".
4698 *dst++ = *src++;
4699 colon = dst;
4700 *dst++ = ':';
4701 src++;
4702 } else {
4703 src = path;
4704 if (isfilesep(src[0]) && isfilesep(src[1])) {
4705 // UNC pathname: Retain first separator; leave src pointed at
4706 // second separator so that further separators will be collapsed
4707 // into the second separator. The result will be a pathname
4708 // beginning with "\\\\" followed (most likely) by a host name.
4709 src = dst = path + 1;
4710 path[0] = '\\'; // Force first separator to '\\'
4711 }
4712 }
4713
4714 end = dst;
4715
4716 // Remove redundant separators from remainder of path, forcing all
4717 // separators to be '\\' rather than '/'. Also, single byte space
4718 // characters are removed from the end of the path because those
4719 // are not legal ending characters on this operating system.
4720 //
4721 while (*src != '\0') {
4722 if (isfilesep(*src)) {
4723 *dst++ = '\\'; src++;
4724 while (isfilesep(*src)) src++;
4725 if (*src == '\0') {
4726 // Check for trailing separator
4727 end = dst;
4728 if (colon == dst - 2) break; // "z:\\"
4729 if (dst == path + 1) break; // "\\"
4730 if (dst == path + 2 && isfilesep(path[0])) {
4731 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4732 // beginning of a UNC pathname. Even though it is not, by
4733 // itself, a valid UNC pathname, we leave it as is in order
4734 // to be consistent with the path canonicalizer as well
4735 // as the win32 APIs, which treat this case as an invalid
4736 // UNC pathname rather than as an alias for the root
4737 // directory of the current drive.
4738 break;
4739 }
4740 end = --dst; // Path does not denote a root directory, so
4741 // remove trailing separator
4742 break;
4743 }
4744 end = dst;
4745 } else {
4746 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4747 *dst++ = *src++;
4748 if (*src) *dst++ = *src++;
4749 end = dst;
4750 } else { // Copy a single-byte character
4751 char c = *src++;
4752 *dst++ = c;
4753 // Space is not a legal ending character
4754 if (c != ' ') end = dst;
4755 }
4756 }
4757 }
4758
4759 *end = '\0';
4760
4761 // For "z:", add "." to work around a bug in the C runtime library
4762 if (colon == dst - 1) {
4763 path[2] = '.';
4764 path[3] = '\0';
4765 }
4766
4767 return path;
4768 }
4769
4770 // This code is a copy of JDK's sysSetLength
4771 // from src/windows/hpi/src/sys_api_md.c
4772
4773 int os::ftruncate(int fd, jlong length) {
4774 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4775 long high = (long)(length >> 32);
4776 DWORD ret;
4777
4778 if (h == (HANDLE)(-1)) {
4779 return -1;
4780 }
4781
4782 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4783 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4784 return -1;
4785 }
4786
4787 if (::SetEndOfFile(h) == FALSE) {
4788 return -1;
4789 }
4790
4791 return 0;
4792 }
4793
4794 int os::get_fileno(FILE* fp) {
4795 return _fileno(fp);
4796 }
4797
4798 // This code is a copy of JDK's sysSync
4799 // from src/windows/hpi/src/sys_api_md.c
4800 // except for the legacy workaround for a bug in Win 98
4801
4802 int os::fsync(int fd) {
4803 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4804
4805 if ((!::FlushFileBuffers(handle)) &&
4806 (GetLastError() != ERROR_ACCESS_DENIED)) {
4807 // from winerror.h
4808 return -1;
4809 }
4810 return 0;
4811 }
4812
4813 static int nonSeekAvailable(int, long *);
4814 static int stdinAvailable(int, long *);
4815
4816 // This code is a copy of JDK's sysAvailable
4817 // from src/windows/hpi/src/sys_api_md.c
4818
4819 int os::available(int fd, jlong *bytes) {
4820 jlong cur, end;
4821 struct _stati64 stbuf64;
4822
4823 if (::_fstati64(fd, &stbuf64) >= 0) {
4824 int mode = stbuf64.st_mode;
4825 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4826 int ret;
4827 long lpbytes;
4828 if (fd == 0) {
4829 ret = stdinAvailable(fd, &lpbytes);
4830 } else {
4831 ret = nonSeekAvailable(fd, &lpbytes);
4832 }
4833 (*bytes) = (jlong)(lpbytes);
4834 return ret;
4835 }
4836 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4837 return FALSE;
4838 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4839 return FALSE;
4840 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4841 return FALSE;
4842 }
4843 *bytes = end - cur;
4844 return TRUE;
4845 } else {
4846 return FALSE;
4847 }
4848 }
4849
4850 void os::flockfile(FILE* fp) {
4851 _lock_file(fp);
4852 }
4853
4854 void os::funlockfile(FILE* fp) {
4855 _unlock_file(fp);
4856 }
4857
4858 // This code is a copy of JDK's nonSeekAvailable
4859 // from src/windows/hpi/src/sys_api_md.c
4860
4861 static int nonSeekAvailable(int fd, long *pbytes) {
4862 // This is used for available on non-seekable devices
4863 // (like both named and anonymous pipes, such as pipes
4864 // connected to an exec'd process).
4865 // Standard Input is a special case.
4866 HANDLE han;
4867
4868 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4869 return FALSE;
4870 }
4871
4872 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4873 // PeekNamedPipe fails when at EOF. In that case we
4874 // simply make *pbytes = 0 which is consistent with the
4875 // behavior we get on Solaris when an fd is at EOF.
4876 // The only alternative is to raise an Exception,
4877 // which isn't really warranted.
4878 //
4879 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4880 return FALSE;
4881 }
4882 *pbytes = 0;
4883 }
4884 return TRUE;
4885 }
4886
4887 #define MAX_INPUT_EVENTS 2000
4888
4889 // This code is a copy of JDK's stdinAvailable
4890 // from src/windows/hpi/src/sys_api_md.c
4891
4892 static int stdinAvailable(int fd, long *pbytes) {
4893 HANDLE han;
4894 DWORD numEventsRead = 0; // Number of events read from buffer
4895 DWORD numEvents = 0; // Number of events in buffer
4896 DWORD i = 0; // Loop index
4897 DWORD curLength = 0; // Position marker
4898 DWORD actualLength = 0; // Number of bytes readable
4899 BOOL error = FALSE; // Error holder
4900 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4901
4902 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4903 return FALSE;
4904 }
4905
4906 // Construct an array of input records in the console buffer
4907 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4908 if (error == 0) {
4909 return nonSeekAvailable(fd, pbytes);
4910 }
4911
4912 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4913 if (numEvents > MAX_INPUT_EVENTS) {
4914 numEvents = MAX_INPUT_EVENTS;
4915 }
4916
4917 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4918 if (lpBuffer == NULL) {
4919 return FALSE;
4920 }
4921
4922 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4923 if (error == 0) {
4924 os::free(lpBuffer);
4925 return FALSE;
4926 }
4927
4928 // Examine input records for the number of bytes available
4929 for (i=0; i<numEvents; i++) {
4930 if (lpBuffer[i].EventType == KEY_EVENT) {
4931
4932 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4933 &(lpBuffer[i].Event);
4934 if (keyRecord->bKeyDown == TRUE) {
4935 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4936 curLength++;
4937 if (*keyPressed == '\r') {
4938 actualLength = curLength;
4939 }
4940 }
4941 }
4942 }
4943
4944 if (lpBuffer != NULL) {
4945 os::free(lpBuffer);
4946 }
4947
4948 *pbytes = (long) actualLength;
4949 return TRUE;
4950 }
4951
4952 // Map a block of memory.
4953 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4954 char *addr, size_t bytes, bool read_only,
4955 bool allow_exec) {
4956 HANDLE hFile;
4957 char* base;
4958
4959 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4960 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4961 if (hFile == NULL) {
4962 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4963 return NULL;
4964 }
4965
4966 if (allow_exec) {
4967 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4968 // unless it comes from a PE image (which the shared archive is not.)
4969 // Even VirtualProtect refuses to give execute access to mapped memory
4970 // that was not previously executable.
4971 //
4972 // Instead, stick the executable region in anonymous memory. Yuck.
4973 // Penalty is that ~4 pages will not be shareable - in the future
4974 // we might consider DLLizing the shared archive with a proper PE
4975 // header so that mapping executable + sharing is possible.
4976
4977 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4978 PAGE_READWRITE);
4979 if (base == NULL) {
4980 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4981 CloseHandle(hFile);
4982 return NULL;
4983 }
4984
4985 // Record virtual memory allocation
4986 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
4987
4988 DWORD bytes_read;
4989 OVERLAPPED overlapped;
4990 overlapped.Offset = (DWORD)file_offset;
4991 overlapped.OffsetHigh = 0;
4992 overlapped.hEvent = NULL;
4993 // ReadFile guarantees that if the return value is true, the requested
4994 // number of bytes were read before returning.
4995 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4996 if (!res) {
4997 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4998 release_memory(base, bytes);
4999 CloseHandle(hFile);
5000 return NULL;
5001 }
5002 } else {
5003 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
5004 NULL /* file_name */);
5005 if (hMap == NULL) {
5006 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
5007 CloseHandle(hFile);
5008 return NULL;
5009 }
5010
5011 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
5012 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
5013 (DWORD)bytes, addr);
5014 if (base == NULL) {
5015 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
5016 CloseHandle(hMap);
5017 CloseHandle(hFile);
5018 return NULL;
5019 }
5020
5021 if (CloseHandle(hMap) == 0) {
5022 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
5023 CloseHandle(hFile);
5024 return base;
5025 }
5026 }
5027
5028 if (allow_exec) {
5029 DWORD old_protect;
5030 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
5031 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
5032
5033 if (!res) {
5034 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
5035 // Don't consider this a hard error, on IA32 even if the
5036 // VirtualProtect fails, we should still be able to execute
5037 CloseHandle(hFile);
5038 return base;
5039 }
5040 }
5041
5042 if (CloseHandle(hFile) == 0) {
5043 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
5044 return base;
5045 }
5046
5047 return base;
5048 }
5049
5050
5051 // Remap a block of memory.
5052 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5053 char *addr, size_t bytes, bool read_only,
5054 bool allow_exec) {
5055 // This OS does not allow existing memory maps to be remapped so we
5056 // would have to unmap the memory before we remap it.
5057
5058 // Because there is a small window between unmapping memory and mapping
5059 // it in again with different protections, CDS archives are mapped RW
5060 // on windows, so this function isn't called.
5061 ShouldNotReachHere();
5062 return NULL;
5063 }
5064
5065
5066 // Unmap a block of memory.
5067 // Returns true=success, otherwise false.
5068
5069 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5070 MEMORY_BASIC_INFORMATION mem_info;
5071 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5072 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5073 return false;
5074 }
5075
5076 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5077 // Instead, executable region was allocated using VirtualAlloc(). See
5078 // pd_map_memory() above.
5079 //
5080 // The following flags should match the 'exec_access' flages used for
5081 // VirtualProtect() in pd_map_memory().
5082 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5083 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5084 return pd_release_memory(addr, bytes);
5085 }
5086
5087 BOOL result = UnmapViewOfFile(addr);
5088 if (result == 0) {
5089 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5090 return false;
5091 }
5092 return true;
5093 }
5094
5095 void os::pause() {
5096 char filename[MAX_PATH];
5097 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5098 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5099 } else {
5100 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5101 }
5102
5103 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5104 if (fd != -1) {
5105 struct stat buf;
5106 ::close(fd);
5107 while (::stat(filename, &buf) == 0) {
5108 Sleep(100);
5109 }
5110 } else {
5111 jio_fprintf(stderr,
5112 "Could not open pause file '%s', continuing immediately.\n", filename);
5113 }
5114 }
5115
5116 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5117 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5118 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5119
5120 os::ThreadCrashProtection::ThreadCrashProtection() {
5121 }
5122
5123 // See the caveats for this class in os_windows.hpp
5124 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5125 // into this method and returns false. If no OS EXCEPTION was raised, returns
5126 // true.
5127 // The callback is supposed to provide the method that should be protected.
5128 //
5129 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5130
5131 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5132
5133 _protected_thread = Thread::current_or_null();
5134 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5135
5136 bool success = true;
5137 __try {
5138 _crash_protection = this;
5139 cb.call();
5140 } __except(EXCEPTION_EXECUTE_HANDLER) {
5141 // only for protection, nothing to do
5142 success = false;
5143 }
5144 _crash_protection = NULL;
5145 _protected_thread = NULL;
5146 Thread::muxRelease(&_crash_mux);
5147 return success;
5148 }
5149
5150 // An Event wraps a win32 "CreateEvent" kernel handle.
5151 //
5152 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5153 //
5154 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5155 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5156 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5157 // In addition, an unpark() operation might fetch the handle field, but the
5158 // event could recycle between the fetch and the SetEvent() operation.
5159 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5160 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5161 // on an stale but recycled handle would be harmless, but in practice this might
5162 // confuse other non-Sun code, so it's not a viable approach.
5163 //
5164 // 2: Once a win32 event handle is associated with an Event, it remains associated
5165 // with the Event. The event handle is never closed. This could be construed
5166 // as handle leakage, but only up to the maximum # of threads that have been extant
5167 // at any one time. This shouldn't be an issue, as windows platforms typically
5168 // permit a process to have hundreds of thousands of open handles.
5169 //
5170 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5171 // and release unused handles.
5172 //
5173 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5174 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5175 //
5176 // 5. Use an RCU-like mechanism (Read-Copy Update).
5177 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5178 //
5179 // We use (2).
5180 //
5181 // TODO-FIXME:
5182 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5183 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5184 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5185 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5186 // into a single win32 CreateEvent() handle.
5187 //
5188 // Assumption:
5189 // Only one parker can exist on an event, which is why we allocate
5190 // them per-thread. Multiple unparkers can coexist.
5191 //
5192 // _Event transitions in park()
5193 // -1 => -1 : illegal
5194 // 1 => 0 : pass - return immediately
5195 // 0 => -1 : block; then set _Event to 0 before returning
5196 //
5197 // _Event transitions in unpark()
5198 // 0 => 1 : just return
5199 // 1 => 1 : just return
5200 // -1 => either 0 or 1; must signal target thread
5201 // That is, we can safely transition _Event from -1 to either
5202 // 0 or 1.
5203 //
5204 // _Event serves as a restricted-range semaphore.
5205 // -1 : thread is blocked, i.e. there is a waiter
5206 // 0 : neutral: thread is running or ready,
5207 // could have been signaled after a wait started
5208 // 1 : signaled - thread is running or ready
5209 //
5210 // Another possible encoding of _Event would be with
5211 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5212 //
5213
5214 int os::PlatformEvent::park(jlong Millis) {
5215 // Transitions for _Event:
5216 // -1 => -1 : illegal
5217 // 1 => 0 : pass - return immediately
5218 // 0 => -1 : block; then set _Event to 0 before returning
5219
5220 guarantee(_ParkHandle != NULL , "Invariant");
5221 guarantee(Millis > 0 , "Invariant");
5222
5223 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5224 // the initial park() operation.
5225 // Consider: use atomic decrement instead of CAS-loop
5226
5227 int v;
5228 for (;;) {
5229 v = _Event;
5230 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5231 }
5232 guarantee((v == 0) || (v == 1), "invariant");
5233 if (v != 0) return OS_OK;
5234
5235 // Do this the hard way by blocking ...
5236 // TODO: consider a brief spin here, gated on the success of recent
5237 // spin attempts by this thread.
5238 //
5239 // We decompose long timeouts into series of shorter timed waits.
5240 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5241 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5242 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5243 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5244 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5245 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5246 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5247 // for the already waited time. This policy does not admit any new outcomes.
5248 // In the future, however, we might want to track the accumulated wait time and
5249 // adjust Millis accordingly if we encounter a spurious wakeup.
5250
5251 const int MAXTIMEOUT = 0x10000000;
5252 DWORD rv = WAIT_TIMEOUT;
5253 while (_Event < 0 && Millis > 0) {
5254 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5255 if (Millis > MAXTIMEOUT) {
5256 prd = MAXTIMEOUT;
5257 }
5258 rv = ::WaitForSingleObject(_ParkHandle, prd);
5259 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5260 if (rv == WAIT_TIMEOUT) {
5261 Millis -= prd;
5262 }
5263 }
5264 v = _Event;
5265 _Event = 0;
5266 // see comment at end of os::PlatformEvent::park() below:
5267 OrderAccess::fence();
5268 // If we encounter a nearly simultanous timeout expiry and unpark()
5269 // we return OS_OK indicating we awoke via unpark().
5270 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5271 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5272 }
5273
5274 void os::PlatformEvent::park() {
5275 // Transitions for _Event:
5276 // -1 => -1 : illegal
5277 // 1 => 0 : pass - return immediately
5278 // 0 => -1 : block; then set _Event to 0 before returning
5279
5280 guarantee(_ParkHandle != NULL, "Invariant");
5281 // Invariant: Only the thread associated with the Event/PlatformEvent
5282 // may call park().
5283 // Consider: use atomic decrement instead of CAS-loop
5284 int v;
5285 for (;;) {
5286 v = _Event;
5287 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5288 }
5289 guarantee((v == 0) || (v == 1), "invariant");
5290 if (v != 0) return;
5291
5292 // Do this the hard way by blocking ...
5293 // TODO: consider a brief spin here, gated on the success of recent
5294 // spin attempts by this thread.
5295 while (_Event < 0) {
5296 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5297 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5298 }
5299
5300 // Usually we'll find _Event == 0 at this point, but as
5301 // an optional optimization we clear it, just in case can
5302 // multiple unpark() operations drove _Event up to 1.
5303 _Event = 0;
5304 OrderAccess::fence();
5305 guarantee(_Event >= 0, "invariant");
5306 }
5307
5308 void os::PlatformEvent::unpark() {
5309 guarantee(_ParkHandle != NULL, "Invariant");
5310
5311 // Transitions for _Event:
5312 // 0 => 1 : just return
5313 // 1 => 1 : just return
5314 // -1 => either 0 or 1; must signal target thread
5315 // That is, we can safely transition _Event from -1 to either
5316 // 0 or 1.
5317 // See also: "Semaphores in Plan 9" by Mullender & Cox
5318 //
5319 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5320 // that it will take two back-to-back park() calls for the owning
5321 // thread to block. This has the benefit of forcing a spurious return
5322 // from the first park() call after an unpark() call which will help
5323 // shake out uses of park() and unpark() without condition variables.
5324
5325 if (Atomic::xchg(1, &_Event) >= 0) return;
5326
5327 ::SetEvent(_ParkHandle);
5328 }
5329
5330
5331 // JSR166
5332 // -------------------------------------------------------
5333
5334 // The Windows implementation of Park is very straightforward: Basic
5335 // operations on Win32 Events turn out to have the right semantics to
5336 // use them directly. We opportunistically resuse the event inherited
5337 // from Monitor.
5338
5339 void Parker::park(bool isAbsolute, jlong time) {
5340 guarantee(_ParkEvent != NULL, "invariant");
5341 // First, demultiplex/decode time arguments
5342 if (time < 0) { // don't wait
5343 return;
5344 } else if (time == 0 && !isAbsolute) {
5345 time = INFINITE;
5346 } else if (isAbsolute) {
5347 time -= os::javaTimeMillis(); // convert to relative time
5348 if (time <= 0) { // already elapsed
5349 return;
5350 }
5351 } else { // relative
5352 time /= 1000000; // Must coarsen from nanos to millis
5353 if (time == 0) { // Wait for the minimal time unit if zero
5354 time = 1;
5355 }
5356 }
5357
5358 JavaThread* thread = JavaThread::current();
5359
5360 // Don't wait if interrupted or already triggered
5361 if (Thread::is_interrupted(thread, false) ||
5362 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5363 ResetEvent(_ParkEvent);
5364 return;
5365 } else {
5366 ThreadBlockInVM tbivm(thread);
5367 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5368 thread->set_suspend_equivalent();
5369
5370 WaitForSingleObject(_ParkEvent, time);
5371 ResetEvent(_ParkEvent);
5372
5373 // If externally suspended while waiting, re-suspend
5374 if (thread->handle_special_suspend_equivalent_condition()) {
5375 thread->java_suspend_self();
5376 }
5377 }
5378 }
5379
5380 void Parker::unpark() {
5381 guarantee(_ParkEvent != NULL, "invariant");
5382 SetEvent(_ParkEvent);
5383 }
5384
5385 // Platform Monitor implementation
5386
5387 // Must already be locked
5388 int os::PlatformMonitor::wait(jlong millis) {
5389 assert(millis >= 0, "negative timeout");
5390 int ret = OS_TIMEOUT;
5391 int status = SleepConditionVariableCS(&_cond, &_mutex,
5392 millis == 0 ? INFINITE : millis);
5393 if (status != 0) {
5394 ret = OS_OK;
5395 }
5396 #ifndef PRODUCT
5397 else {
5398 DWORD err = GetLastError();
5399 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5400 }
5401 #endif
5402 return ret;
5403 }
5404
5405 // Run the specified command in a separate process. Return its exit value,
5406 // or -1 on failure (e.g. can't create a new process).
5407 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5408 STARTUPINFO si;
5409 PROCESS_INFORMATION pi;
5410 DWORD exit_code;
5411
5412 char * cmd_string;
5413 const char * cmd_prefix = "cmd /C ";
5414 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5415 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5416 if (cmd_string == NULL) {
5417 return -1;
5418 }
5419 cmd_string[0] = '\0';
5420 strcat(cmd_string, cmd_prefix);
5421 strcat(cmd_string, cmd);
5422
5423 // now replace all '\n' with '&'
5424 char * substring = cmd_string;
5425 while ((substring = strchr(substring, '\n')) != NULL) {
5426 substring[0] = '&';
5427 substring++;
5428 }
5429 memset(&si, 0, sizeof(si));
5430 si.cb = sizeof(si);
5431 memset(&pi, 0, sizeof(pi));
5432 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5433 cmd_string, // command line
5434 NULL, // process security attribute
5435 NULL, // thread security attribute
5436 TRUE, // inherits system handles
5437 0, // no creation flags
5438 NULL, // use parent's environment block
5439 NULL, // use parent's starting directory
5440 &si, // (in) startup information
5441 &pi); // (out) process information
5442
5443 if (rslt) {
5444 // Wait until child process exits.
5445 WaitForSingleObject(pi.hProcess, INFINITE);
5446
5447 GetExitCodeProcess(pi.hProcess, &exit_code);
5448
5449 // Close process and thread handles.
5450 CloseHandle(pi.hProcess);
5451 CloseHandle(pi.hThread);
5452 } else {
5453 exit_code = -1;
5454 }
5455
5456 FREE_C_HEAP_ARRAY(char, cmd_string);
5457 return (int)exit_code;
5458 }
5459
5460 bool os::find(address addr, outputStream* st) {
5461 int offset = -1;
5462 bool result = false;
5463 char buf[256];
5464 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5465 st->print(PTR_FORMAT " ", addr);
5466 if (strlen(buf) < sizeof(buf) - 1) {
5467 char* p = strrchr(buf, '\\');
5468 if (p) {
5469 st->print("%s", p + 1);
5470 } else {
5471 st->print("%s", buf);
5472 }
5473 } else {
5474 // The library name is probably truncated. Let's omit the library name.
5475 // See also JDK-8147512.
5476 }
5477 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5478 st->print("::%s + 0x%x", buf, offset);
5479 }
5480 st->cr();
5481 result = true;
5482 }
5483 return result;
5484 }
5485
5486 static jint initSock() {
5487 WSADATA wsadata;
5488
5489 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5490 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5491 ::GetLastError());
5492 return JNI_ERR;
5493 }
5494 return JNI_OK;
5495 }
5496
5497 struct hostent* os::get_host_by_name(char* name) {
5498 return (struct hostent*)gethostbyname(name);
5499 }
5500
5501 int os::socket_close(int fd) {
5502 return ::closesocket(fd);
5503 }
5504
5505 int os::socket(int domain, int type, int protocol) {
5506 return ::socket(domain, type, protocol);
5507 }
5508
5509 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5510 return ::connect(fd, him, len);
5511 }
5512
5513 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5514 return ::recv(fd, buf, (int)nBytes, flags);
5515 }
5516
5517 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5518 return ::send(fd, buf, (int)nBytes, flags);
5519 }
5520
5521 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5522 return ::send(fd, buf, (int)nBytes, flags);
5523 }
5524
5525 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5526 #if defined(IA32)
5527 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5528 #elif defined (AMD64)
5529 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5530 #endif
5531
5532 // returns true if thread could be suspended,
5533 // false otherwise
5534 static bool do_suspend(HANDLE* h) {
5535 if (h != NULL) {
5536 if (SuspendThread(*h) != ~0) {
5537 return true;
5538 }
5539 }
5540 return false;
5541 }
5542
5543 // resume the thread
5544 // calling resume on an active thread is a no-op
5545 static void do_resume(HANDLE* h) {
5546 if (h != NULL) {
5547 ResumeThread(*h);
5548 }
5549 }
5550
5551 // retrieve a suspend/resume context capable handle
5552 // from the tid. Caller validates handle return value.
5553 void get_thread_handle_for_extended_context(HANDLE* h,
5554 OSThread::thread_id_t tid) {
5555 if (h != NULL) {
5556 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5557 }
5558 }
5559
5560 // Thread sampling implementation
5561 //
5562 void os::SuspendedThreadTask::internal_do_task() {
5563 CONTEXT ctxt;
5564 HANDLE h = NULL;
5565
5566 // get context capable handle for thread
5567 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5568
5569 // sanity
5570 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5571 return;
5572 }
5573
5574 // suspend the thread
5575 if (do_suspend(&h)) {
5576 ctxt.ContextFlags = sampling_context_flags;
5577 // get thread context
5578 GetThreadContext(h, &ctxt);
5579 SuspendedThreadTaskContext context(_thread, &ctxt);
5580 // pass context to Thread Sampling impl
5581 do_task(context);
5582 // resume thread
5583 do_resume(&h);
5584 }
5585
5586 // close handle
5587 CloseHandle(h);
5588 }
5589
5590 bool os::start_debugging(char *buf, int buflen) {
5591 int len = (int)strlen(buf);
5592 char *p = &buf[len];
5593
5594 jio_snprintf(p, buflen-len,
5595 "\n\n"
5596 "Do you want to debug the problem?\n\n"
5597 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5598 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5599 "Otherwise, select 'No' to abort...",
5600 os::current_process_id(), os::current_thread_id());
5601
5602 bool yes = os::message_box("Unexpected Error", buf);
5603
5604 if (yes) {
5605 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5606 // exception. If VM is running inside a debugger, the debugger will
5607 // catch the exception. Otherwise, the breakpoint exception will reach
5608 // the default windows exception handler, which can spawn a debugger and
5609 // automatically attach to the dying VM.
5610 os::breakpoint();
5611 yes = false;
5612 }
5613 return yes;
5614 }
5615
5616 void* os::get_default_process_handle() {
5617 return (void*)GetModuleHandle(NULL);
5618 }
5619
5620 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5621 // which is used to find statically linked in agents.
5622 // Additionally for windows, takes into account __stdcall names.
5623 // Parameters:
5624 // sym_name: Symbol in library we are looking for
5625 // lib_name: Name of library to look in, NULL for shared libs.
5626 // is_absolute_path == true if lib_name is absolute path to agent
5627 // such as "C:/a/b/L.dll"
5628 // == false if only the base name of the library is passed in
5629 // such as "L"
5630 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5631 bool is_absolute_path) {
5632 char *agent_entry_name;
5633 size_t len;
5634 size_t name_len;
5635 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5636 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5637 const char *start;
5638
5639 if (lib_name != NULL) {
5640 len = name_len = strlen(lib_name);
5641 if (is_absolute_path) {
5642 // Need to strip path, prefix and suffix
5643 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5644 lib_name = ++start;
5645 } else {
5646 // Need to check for drive prefix
5647 if ((start = strchr(lib_name, ':')) != NULL) {
5648 lib_name = ++start;
5649 }
5650 }
5651 if (len <= (prefix_len + suffix_len)) {
5652 return NULL;
5653 }
5654 lib_name += prefix_len;
5655 name_len = strlen(lib_name) - suffix_len;
5656 }
5657 }
5658 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5659 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5660 if (agent_entry_name == NULL) {
5661 return NULL;
5662 }
5663 if (lib_name != NULL) {
5664 const char *p = strrchr(sym_name, '@');
5665 if (p != NULL && p != sym_name) {
5666 // sym_name == _Agent_OnLoad@XX
5667 strncpy(agent_entry_name, sym_name, (p - sym_name));
5668 agent_entry_name[(p-sym_name)] = '\0';
5669 // agent_entry_name == _Agent_OnLoad
5670 strcat(agent_entry_name, "_");
5671 strncat(agent_entry_name, lib_name, name_len);
5672 strcat(agent_entry_name, p);
5673 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5674 } else {
5675 strcpy(agent_entry_name, sym_name);
5676 strcat(agent_entry_name, "_");
5677 strncat(agent_entry_name, lib_name, name_len);
5678 }
5679 } else {
5680 strcpy(agent_entry_name, sym_name);
5681 }
5682 return agent_entry_name;
5683 }
5684
5685 #ifndef PRODUCT
5686
5687 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5688 // contiguous memory block at a particular address.
5689 // The test first tries to find a good approximate address to allocate at by using the same
5690 // method to allocate some memory at any address. The test then tries to allocate memory in
5691 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5692 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5693 // the previously allocated memory is available for allocation. The only actual failure
5694 // that is reported is when the test tries to allocate at a particular location but gets a
5695 // different valid one. A NULL return value at this point is not considered an error but may
5696 // be legitimate.
5697 void TestReserveMemorySpecial_test() {
5698 if (!UseLargePages) {
5699 return;
5700 }
5701 // save current value of globals
5702 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5703 bool old_use_numa_interleaving = UseNUMAInterleaving;
5704
5705 // set globals to make sure we hit the correct code path
5706 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5707
5708 // do an allocation at an address selected by the OS to get a good one.
5709 const size_t large_allocation_size = os::large_page_size() * 4;
5710 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5711 if (result == NULL) {
5712 } else {
5713 os::release_memory_special(result, large_allocation_size);
5714
5715 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5716 // we managed to get it once.
5717 const size_t expected_allocation_size = os::large_page_size();
5718 char* expected_location = result + os::large_page_size();
5719 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5720 if (actual_location == NULL) {
5721 } else {
5722 // release memory
5723 os::release_memory_special(actual_location, expected_allocation_size);
5724 // only now check, after releasing any memory to avoid any leaks.
5725 assert(actual_location == expected_location,
5726 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5727 expected_location, expected_allocation_size, actual_location);
5728 }
5729 }
5730
5731 // restore globals
5732 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5733 UseNUMAInterleaving = old_use_numa_interleaving;
5734 }
5735 #endif // PRODUCT
5736
5737 /*
5738 All the defined signal names for Windows.
5739
5740 NOTE that not all of these names are accepted by FindSignal!
5741
5742 For various reasons some of these may be rejected at runtime.
5743
5744 Here are the names currently accepted by a user of sun.misc.Signal with
5745 1.4.1 (ignoring potential interaction with use of chaining, etc):
5746
5747 (LIST TBD)
5748
5749 */
5750 int os::get_signal_number(const char* name) {
5751 static const struct {
5752 const char* name;
5753 int number;
5754 } siglabels [] =
5755 // derived from version 6.0 VC98/include/signal.h
5756 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5757 "FPE", SIGFPE, // floating point exception
5758 "SEGV", SIGSEGV, // segment violation
5759 "INT", SIGINT, // interrupt
5760 "TERM", SIGTERM, // software term signal from kill
5761 "BREAK", SIGBREAK, // Ctrl-Break sequence
5762 "ILL", SIGILL}; // illegal instruction
5763 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5764 if (strcmp(name, siglabels[i].name) == 0) {
5765 return siglabels[i].number;
5766 }
5767 }
5768 return -1;
5769 }
5770
5771 // Fast current thread access
5772
5773 int os::win32::_thread_ptr_offset = 0;
5774
5775 static void call_wrapper_dummy() {}
5776
5777 // We need to call the os_exception_wrapper once so that it sets
5778 // up the offset from FS of the thread pointer.
5779 void os::win32::initialize_thread_ptr_offset() {
5780 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5781 NULL, NULL, NULL, NULL);
5782 }