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