1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84
85 #include <windows.h>
86 #include <sys/types.h>
87 #include <sys/stat.h>
88 #include <sys/timeb.h>
89 #include <objidl.h>
90 #include <shlobj.h>
91
92 #include <malloc.h>
93 #include <signal.h>
94 #include <direct.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <io.h>
98 #include <process.h> // For _beginthreadex(), _endthreadex()
99 #include <imagehlp.h> // For os::dll_address_to_function_name
100 // for enumerating dll libraries
101 #include <vdmdbg.h>
102 #include <psapi.h>
103 #include <mmsystem.h>
104 #include <winsock2.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(-1)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _M_AMD64
124 #define __CPU__ amd64
125 #else
126 #define __CPU__ i486
127 #endif
128
129 #if INCLUDE_AOT
130 PVOID topLevelVectoredExceptionHandler = NULL;
131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
132 #endif
133
134 // save DLL module handle, used by GetModuleFileName
135
136 HINSTANCE vm_lib_handle;
137
138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
139 switch (reason) {
140 case DLL_PROCESS_ATTACH:
141 vm_lib_handle = hinst;
142 if (ForceTimeHighResolution) {
143 timeBeginPeriod(1L);
144 }
145 WindowsDbgHelp::pre_initialize();
146 SymbolEngine::pre_initialize();
147 break;
148 case DLL_PROCESS_DETACH:
149 if (ForceTimeHighResolution) {
150 timeEndPeriod(1L);
151 }
152 #if INCLUDE_AOT
153 if (topLevelVectoredExceptionHandler != NULL) {
154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
155 topLevelVectoredExceptionHandler = NULL;
156 }
157 #endif
158 break;
159 default:
160 break;
161 }
162 return true;
163 }
164
165 static inline double fileTimeAsDouble(FILETIME* time) {
166 const double high = (double) ((unsigned int) ~0);
167 const double split = 10000000.0;
168 double result = (time->dwLowDateTime / split) +
169 time->dwHighDateTime * (high/split);
170 return result;
171 }
172
173 // Implementation of os
174
175 bool os::unsetenv(const char* name) {
176 assert(name != NULL, "Null pointer");
177 return (SetEnvironmentVariable(name, NULL) == TRUE);
178 }
179
180 // No setuid programs under Windows.
181 bool os::have_special_privileges() {
182 return false;
183 }
184
185
186 // This method is a periodic task to check for misbehaving JNI applications
187 // under CheckJNI, we can add any periodic checks here.
188 // For Windows at the moment does nothing
189 void os::run_periodic_checks() {
190 return;
191 }
192
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197
198 void os::init_system_properties_values() {
199 // sysclasspath, java_home, dll_dir
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 const char *bin = "\\bin";
205 char home_dir[MAX_PATH + 1];
206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
207
208 if (alt_home_dir != NULL) {
209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
210 home_dir[MAX_PATH] = '\0';
211 } else {
212 os::jvm_path(home_dir, sizeof(home_dir));
213 // Found the full path to jvm.dll.
214 // Now cut the path to <java_home>/jre if we can.
215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \{client|server}
219 pslash = strrchr(home_dir, '\\');
220 if (pslash != NULL) {
221 *pslash = '\0'; // get rid of \bin
222 }
223 }
224 }
225
226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
227 if (home_path == NULL) {
228 return;
229 }
230 strcpy(home_path, home_dir);
231 Arguments::set_java_home(home_path);
232 FREE_C_HEAP_ARRAY(char, home_path);
233
234 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
235 mtInternal);
236 if (dll_path == NULL) {
237 return;
238 }
239 strcpy(dll_path, home_dir);
240 strcat(dll_path, bin);
241 Arguments::set_dll_dir(dll_path);
242 FREE_C_HEAP_ARRAY(char, dll_path);
243
244 if (!set_boot_path('\\', ';')) {
245 vm_exit_during_initialization("Failed setting boot class path.", NULL);
246 }
247 }
248
249 // library_path
250 #define EXT_DIR "\\lib\\ext"
251 #define BIN_DIR "\\bin"
252 #define PACKAGE_DIR "\\Sun\\Java"
253 {
254 // Win32 library search order (See the documentation for LoadLibrary):
255 //
256 // 1. The directory from which application is loaded.
257 // 2. The system wide Java Extensions directory (Java only)
258 // 3. System directory (GetSystemDirectory)
259 // 4. Windows directory (GetWindowsDirectory)
260 // 5. The PATH environment variable
261 // 6. The current directory
262
263 char *library_path;
264 char tmp[MAX_PATH];
265 char *path_str = ::getenv("PATH");
266
267 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
268 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
269
270 library_path[0] = '\0';
271
272 GetModuleFileName(NULL, tmp, sizeof(tmp));
273 *(strrchr(tmp, '\\')) = '\0';
274 strcat(library_path, tmp);
275
276 GetWindowsDirectory(tmp, sizeof(tmp));
277 strcat(library_path, ";");
278 strcat(library_path, tmp);
279 strcat(library_path, PACKAGE_DIR BIN_DIR);
280
281 GetSystemDirectory(tmp, sizeof(tmp));
282 strcat(library_path, ";");
283 strcat(library_path, tmp);
284
285 GetWindowsDirectory(tmp, sizeof(tmp));
286 strcat(library_path, ";");
287 strcat(library_path, tmp);
288
289 if (path_str) {
290 strcat(library_path, ";");
291 strcat(library_path, path_str);
292 }
293
294 strcat(library_path, ";.");
295
296 Arguments::set_library_path(library_path);
297 FREE_C_HEAP_ARRAY(char, library_path);
298 }
299
300 // Default extensions directory
301 {
302 char path[MAX_PATH];
303 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
304 GetWindowsDirectory(path, MAX_PATH);
305 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
306 path, PACKAGE_DIR, EXT_DIR);
307 Arguments::set_ext_dirs(buf);
308 }
309 #undef EXT_DIR
310 #undef BIN_DIR
311 #undef PACKAGE_DIR
312
313 #ifndef _WIN64
314 // set our UnhandledExceptionFilter and save any previous one
315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
316 #endif
317
318 // Done
319 return;
320 }
321
322 void os::breakpoint() {
323 DebugBreak();
324 }
325
326 // Invoked from the BREAKPOINT Macro
327 extern "C" void breakpoint() {
328 os::breakpoint();
329 }
330
331 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
332 // So far, this method is only used by Native Memory Tracking, which is
333 // only supported on Windows XP or later.
334 //
335 int os::get_native_stack(address* stack, int frames, int toSkip) {
336 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
337 for (int index = captured; index < frames; index ++) {
338 stack[index] = NULL;
339 }
340 return captured;
341 }
342
343
344 // os::current_stack_base()
345 //
346 // Returns the base of the stack, which is the stack's
347 // starting address. This function must be called
348 // while running on the stack of the thread being queried.
349
350 address os::current_stack_base() {
351 MEMORY_BASIC_INFORMATION minfo;
352 address stack_bottom;
353 size_t stack_size;
354
355 VirtualQuery(&minfo, &minfo, sizeof(minfo));
356 stack_bottom = (address)minfo.AllocationBase;
357 stack_size = minfo.RegionSize;
358
359 // Add up the sizes of all the regions with the same
360 // AllocationBase.
361 while (1) {
362 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
363 if (stack_bottom == (address)minfo.AllocationBase) {
364 stack_size += minfo.RegionSize;
365 } else {
366 break;
367 }
368 }
369 return stack_bottom + stack_size;
370 }
371
372 size_t os::current_stack_size() {
373 size_t sz;
374 MEMORY_BASIC_INFORMATION minfo;
375 VirtualQuery(&minfo, &minfo, sizeof(minfo));
376 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
377 return sz;
378 }
379
380 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
381 MEMORY_BASIC_INFORMATION minfo;
382 committed_start = NULL;
383 committed_size = 0;
384 address top = start + size;
385 const address start_addr = start;
386 while (start < top) {
387 VirtualQuery(start, &minfo, sizeof(minfo));
388 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
389 if (committed_start != NULL) {
390 break;
391 }
392 } else { // committed
393 if (committed_start == NULL) {
394 committed_start = start;
395 }
396 size_t offset = start - (address)minfo.BaseAddress;
397 committed_size += minfo.RegionSize - offset;
398 }
399 start = (address)minfo.BaseAddress + minfo.RegionSize;
400 }
401
402 if (committed_start == NULL) {
403 assert(committed_size == 0, "Sanity");
404 return false;
405 } else {
406 assert(committed_start >= start_addr && committed_start < top, "Out of range");
407 // current region may go beyond the limit, trim to the limit
408 committed_size = MIN2(committed_size, size_t(top - committed_start));
409 return true;
410 }
411 }
412
413 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
414 const struct tm* time_struct_ptr = localtime(clock);
415 if (time_struct_ptr != NULL) {
416 *res = *time_struct_ptr;
417 return res;
418 }
419 return NULL;
420 }
421
422 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
423 const struct tm* time_struct_ptr = gmtime(clock);
424 if (time_struct_ptr != NULL) {
425 *res = *time_struct_ptr;
426 return res;
427 }
428 return NULL;
429 }
430
431 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
432
433 // Thread start routine for all newly created threads
434 static unsigned __stdcall thread_native_entry(Thread* thread) {
435
436 thread->record_stack_base_and_size();
437
438 // Try to randomize the cache line index of hot stack frames.
439 // This helps when threads of the same stack traces evict each other's
440 // cache lines. The threads can be either from the same JVM instance, or
441 // from different JVM instances. The benefit is especially true for
442 // processors with hyperthreading technology.
443 static int counter = 0;
444 int pid = os::current_process_id();
445 _alloca(((pid ^ counter++) & 7) * 128);
446
447 thread->initialize_thread_current();
448
449 OSThread* osthr = thread->osthread();
450 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
451
452 if (UseNUMA) {
453 int lgrp_id = os::numa_get_group_id();
454 if (lgrp_id != -1) {
455 thread->set_lgrp_id(lgrp_id);
456 }
457 }
458
459 // Diagnostic code to investigate JDK-6573254
460 int res = 30115; // non-java thread
461 if (thread->is_Java_thread()) {
462 res = 20115; // java thread
463 }
464
465 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
466
467 // Install a win32 structured exception handler around every thread created
468 // by VM, so VM can generate error dump when an exception occurred in non-
469 // Java thread (e.g. VM thread).
470 __try {
471 thread->call_run();
472 } __except(topLevelExceptionFilter(
473 (_EXCEPTION_POINTERS*)_exception_info())) {
474 // Nothing to do.
475 }
476
477 // Note: at this point the thread object may already have deleted itself.
478 // Do not dereference it from here on out.
479
480 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
481
482 // One less thread is executing
483 // When the VMThread gets here, the main thread may have already exited
484 // which frees the CodeHeap containing the Atomic::add code
485 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
486 Atomic::dec(&os::win32::_os_thread_count);
487 }
488
489 // Thread must not return from exit_process_or_thread(), but if it does,
490 // let it proceed to exit normally
491 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
492 }
493
494 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
495 int thread_id) {
496 // Allocate the OSThread object
497 OSThread* osthread = new OSThread(NULL, NULL);
498 if (osthread == NULL) return NULL;
499
500 // Initialize support for Java interrupts
501 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
502 if (interrupt_event == NULL) {
503 delete osthread;
504 return NULL;
505 }
506 osthread->set_interrupt_event(interrupt_event);
507
508 // Store info on the Win32 thread into the OSThread
509 osthread->set_thread_handle(thread_handle);
510 osthread->set_thread_id(thread_id);
511
512 if (UseNUMA) {
513 int lgrp_id = os::numa_get_group_id();
514 if (lgrp_id != -1) {
515 thread->set_lgrp_id(lgrp_id);
516 }
517 }
518
519 // Initial thread state is INITIALIZED, not SUSPENDED
520 osthread->set_state(INITIALIZED);
521
522 return osthread;
523 }
524
525
526 bool os::create_attached_thread(JavaThread* thread) {
527 #ifdef ASSERT
528 thread->verify_not_published();
529 #endif
530 HANDLE thread_h;
531 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
532 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
533 fatal("DuplicateHandle failed\n");
534 }
535 OSThread* osthread = create_os_thread(thread, thread_h,
536 (int)current_thread_id());
537 if (osthread == NULL) {
538 return false;
539 }
540
541 // Initial thread state is RUNNABLE
542 osthread->set_state(RUNNABLE);
543
544 thread->set_osthread(osthread);
545
546 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
547 os::current_thread_id());
548
549 return true;
550 }
551
552 bool os::create_main_thread(JavaThread* thread) {
553 #ifdef ASSERT
554 thread->verify_not_published();
555 #endif
556 if (_starting_thread == NULL) {
557 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
558 if (_starting_thread == NULL) {
559 return false;
560 }
561 }
562
563 // The primordial thread is runnable from the start)
564 _starting_thread->set_state(RUNNABLE);
565
566 thread->set_osthread(_starting_thread);
567 return true;
568 }
569
570 // Helper function to trace _beginthreadex attributes,
571 // similar to os::Posix::describe_pthread_attr()
572 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
573 size_t stacksize, unsigned initflag) {
574 stringStream ss(buf, buflen);
575 if (stacksize == 0) {
576 ss.print("stacksize: default, ");
577 } else {
578 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
579 }
580 ss.print("flags: ");
581 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
582 #define ALL(X) \
583 X(CREATE_SUSPENDED) \
584 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
585 ALL(PRINT_FLAG)
586 #undef ALL
587 #undef PRINT_FLAG
588 return buf;
589 }
590
591 // Allocate and initialize a new OSThread
592 bool os::create_thread(Thread* thread, ThreadType thr_type,
593 size_t stack_size) {
594 unsigned thread_id;
595
596 // Allocate the OSThread object
597 OSThread* osthread = new OSThread(NULL, NULL);
598 if (osthread == NULL) {
599 return false;
600 }
601
602 // Initialize support for Java interrupts
603 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
604 if (interrupt_event == NULL) {
605 delete osthread;
606 return false;
607 }
608 osthread->set_interrupt_event(interrupt_event);
609 osthread->set_interrupted(false);
610
611 thread->set_osthread(osthread);
612
613 if (stack_size == 0) {
614 switch (thr_type) {
615 case os::java_thread:
616 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
617 if (JavaThread::stack_size_at_create() > 0) {
618 stack_size = JavaThread::stack_size_at_create();
619 }
620 break;
621 case os::compiler_thread:
622 if (CompilerThreadStackSize > 0) {
623 stack_size = (size_t)(CompilerThreadStackSize * K);
624 break;
625 } // else fall through:
626 // use VMThreadStackSize if CompilerThreadStackSize is not defined
627 case os::vm_thread:
628 case os::pgc_thread:
629 case os::cgc_thread:
630 case os::watcher_thread:
631 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
632 break;
633 }
634 }
635
636 // Create the Win32 thread
637 //
638 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
639 // does not specify stack size. Instead, it specifies the size of
640 // initially committed space. The stack size is determined by
641 // PE header in the executable. If the committed "stack_size" is larger
642 // than default value in the PE header, the stack is rounded up to the
643 // nearest multiple of 1MB. For example if the launcher has default
644 // stack size of 320k, specifying any size less than 320k does not
645 // affect the actual stack size at all, it only affects the initial
646 // commitment. On the other hand, specifying 'stack_size' larger than
647 // default value may cause significant increase in memory usage, because
648 // not only the stack space will be rounded up to MB, but also the
649 // entire space is committed upfront.
650 //
651 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
652 // for CreateThread() that can treat 'stack_size' as stack size. However we
653 // are not supposed to call CreateThread() directly according to MSDN
654 // document because JVM uses C runtime library. The good news is that the
655 // flag appears to work with _beginthredex() as well.
656
657 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
658 HANDLE thread_handle =
659 (HANDLE)_beginthreadex(NULL,
660 (unsigned)stack_size,
661 (unsigned (__stdcall *)(void*)) thread_native_entry,
662 thread,
663 initflag,
664 &thread_id);
665
666 char buf[64];
667 if (thread_handle != NULL) {
668 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
669 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
670 } else {
671 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
672 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
673 // Log some OS information which might explain why creating the thread failed.
674 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
675 LogStream st(Log(os, thread)::info());
676 os::print_memory_info(&st);
677 }
678
679 if (thread_handle == NULL) {
680 // Need to clean up stuff we've allocated so far
681 CloseHandle(osthread->interrupt_event());
682 thread->set_osthread(NULL);
683 delete osthread;
684 return false;
685 }
686
687 Atomic::inc(&os::win32::_os_thread_count);
688
689 // Store info on the Win32 thread into the OSThread
690 osthread->set_thread_handle(thread_handle);
691 osthread->set_thread_id(thread_id);
692
693 // Initial thread state is INITIALIZED, not SUSPENDED
694 osthread->set_state(INITIALIZED);
695
696 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
697 return true;
698 }
699
700
701 // Free Win32 resources related to the OSThread
702 void os::free_thread(OSThread* osthread) {
703 assert(osthread != NULL, "osthread not set");
704
705 // We are told to free resources of the argument thread,
706 // but we can only really operate on the current thread.
707 assert(Thread::current()->osthread() == osthread,
708 "os::free_thread but not current thread");
709
710 CloseHandle(osthread->thread_handle());
711 CloseHandle(osthread->interrupt_event());
712 delete osthread;
713 }
714
715 static jlong first_filetime;
716 static jlong initial_performance_count;
717 static jlong performance_frequency;
718
719
720 jlong as_long(LARGE_INTEGER x) {
721 jlong result = 0; // initialization to avoid warning
722 set_high(&result, x.HighPart);
723 set_low(&result, x.LowPart);
724 return result;
725 }
726
727
728 jlong os::elapsed_counter() {
729 LARGE_INTEGER count;
730 QueryPerformanceCounter(&count);
731 return as_long(count) - initial_performance_count;
732 }
733
734
735 jlong os::elapsed_frequency() {
736 return performance_frequency;
737 }
738
739
740 julong os::available_memory() {
741 return win32::available_memory();
742 }
743
744 julong os::win32::available_memory() {
745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
746 // value if total memory is larger than 4GB
747 MEMORYSTATUSEX ms;
748 ms.dwLength = sizeof(ms);
749 GlobalMemoryStatusEx(&ms);
750
751 return (julong)ms.ullAvailPhys;
752 }
753
754 julong os::physical_memory() {
755 return win32::physical_memory();
756 }
757
758 bool os::has_allocatable_memory_limit(julong* limit) {
759 MEMORYSTATUSEX ms;
760 ms.dwLength = sizeof(ms);
761 GlobalMemoryStatusEx(&ms);
762 #ifdef _LP64
763 *limit = (julong)ms.ullAvailVirtual;
764 return true;
765 #else
766 // Limit to 1400m because of the 2gb address space wall
767 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
768 return true;
769 #endif
770 }
771
772 int os::active_processor_count() {
773 // User has overridden the number of active processors
774 if (ActiveProcessorCount > 0) {
775 log_trace(os)("active_processor_count: "
776 "active processor count set by user : %d",
777 ActiveProcessorCount);
778 return ActiveProcessorCount;
779 }
780
781 DWORD_PTR lpProcessAffinityMask = 0;
782 DWORD_PTR lpSystemAffinityMask = 0;
783 int proc_count = processor_count();
784 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
785 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
786 // Nof active processors is number of bits in process affinity mask
787 int bitcount = 0;
788 while (lpProcessAffinityMask != 0) {
789 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
790 bitcount++;
791 }
792 return bitcount;
793 } else {
794 return proc_count;
795 }
796 }
797
798 void os::set_native_thread_name(const char *name) {
799
800 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
801 //
802 // Note that unfortunately this only works if the process
803 // is already attached to a debugger; debugger must observe
804 // the exception below to show the correct name.
805
806 // If there is no debugger attached skip raising the exception
807 if (!IsDebuggerPresent()) {
808 return;
809 }
810
811 const DWORD MS_VC_EXCEPTION = 0x406D1388;
812 struct {
813 DWORD dwType; // must be 0x1000
814 LPCSTR szName; // pointer to name (in user addr space)
815 DWORD dwThreadID; // thread ID (-1=caller thread)
816 DWORD dwFlags; // reserved for future use, must be zero
817 } info;
818
819 info.dwType = 0x1000;
820 info.szName = name;
821 info.dwThreadID = -1;
822 info.dwFlags = 0;
823
824 __try {
825 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
826 } __except(EXCEPTION_EXECUTE_HANDLER) {}
827 }
828
829 bool os::distribute_processes(uint length, uint* distribution) {
830 // Not yet implemented.
831 return false;
832 }
833
834 bool os::bind_to_processor(uint processor_id) {
835 // Not yet implemented.
836 return false;
837 }
838
839 void os::win32::initialize_performance_counter() {
840 LARGE_INTEGER count;
841 QueryPerformanceFrequency(&count);
842 performance_frequency = as_long(count);
843 QueryPerformanceCounter(&count);
844 initial_performance_count = as_long(count);
845 }
846
847
848 double os::elapsedTime() {
849 return (double) elapsed_counter() / (double) elapsed_frequency();
850 }
851
852
853 // Windows format:
854 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
855 // Java format:
856 // Java standards require the number of milliseconds since 1/1/1970
857
858 // Constant offset - calculated using offset()
859 static jlong _offset = 116444736000000000;
860 // Fake time counter for reproducible results when debugging
861 static jlong fake_time = 0;
862
863 #ifdef ASSERT
864 // Just to be safe, recalculate the offset in debug mode
865 static jlong _calculated_offset = 0;
866 static int _has_calculated_offset = 0;
867
868 jlong offset() {
869 if (_has_calculated_offset) return _calculated_offset;
870 SYSTEMTIME java_origin;
871 java_origin.wYear = 1970;
872 java_origin.wMonth = 1;
873 java_origin.wDayOfWeek = 0; // ignored
874 java_origin.wDay = 1;
875 java_origin.wHour = 0;
876 java_origin.wMinute = 0;
877 java_origin.wSecond = 0;
878 java_origin.wMilliseconds = 0;
879 FILETIME jot;
880 if (!SystemTimeToFileTime(&java_origin, &jot)) {
881 fatal("Error = %d\nWindows error", GetLastError());
882 }
883 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
884 _has_calculated_offset = 1;
885 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
886 return _calculated_offset;
887 }
888 #else
889 jlong offset() {
890 return _offset;
891 }
892 #endif
893
894 jlong windows_to_java_time(FILETIME wt) {
895 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
896 return (a - offset()) / 10000;
897 }
898
899 // Returns time ticks in (10th of micro seconds)
900 jlong windows_to_time_ticks(FILETIME wt) {
901 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
902 return (a - offset());
903 }
904
905 FILETIME java_to_windows_time(jlong l) {
906 jlong a = (l * 10000) + offset();
907 FILETIME result;
908 result.dwHighDateTime = high(a);
909 result.dwLowDateTime = low(a);
910 return result;
911 }
912
913 bool os::supports_vtime() { return true; }
914 bool os::enable_vtime() { return false; }
915 bool os::vtime_enabled() { return false; }
916
917 double os::elapsedVTime() {
918 FILETIME created;
919 FILETIME exited;
920 FILETIME kernel;
921 FILETIME user;
922 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
923 // the resolution of windows_to_java_time() should be sufficient (ms)
924 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
925 } else {
926 return elapsedTime();
927 }
928 }
929
930 jlong os::javaTimeMillis() {
931 FILETIME wt;
932 GetSystemTimeAsFileTime(&wt);
933 return windows_to_java_time(wt);
934 }
935
936 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
937 FILETIME wt;
938 GetSystemTimeAsFileTime(&wt);
939 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
940 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
941 seconds = secs;
942 nanos = jlong(ticks - (secs*10000000)) * 100;
943 }
944
945 jlong os::javaTimeNanos() {
946 LARGE_INTEGER current_count;
947 QueryPerformanceCounter(¤t_count);
948 double current = as_long(current_count);
949 double freq = performance_frequency;
950 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
951 return time;
952 }
953
954 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
955 jlong freq = performance_frequency;
956 if (freq < NANOSECS_PER_SEC) {
957 // the performance counter is 64 bits and we will
958 // be multiplying it -- so no wrap in 64 bits
959 info_ptr->max_value = ALL_64_BITS;
960 } else if (freq > NANOSECS_PER_SEC) {
961 // use the max value the counter can reach to
962 // determine the max value which could be returned
963 julong max_counter = (julong)ALL_64_BITS;
964 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
965 } else {
966 // the performance counter is 64 bits and we will
967 // be using it directly -- so no wrap in 64 bits
968 info_ptr->max_value = ALL_64_BITS;
969 }
970
971 // using a counter, so no skipping
972 info_ptr->may_skip_backward = false;
973 info_ptr->may_skip_forward = false;
974
975 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
976 }
977
978 char* os::local_time_string(char *buf, size_t buflen) {
979 SYSTEMTIME st;
980 GetLocalTime(&st);
981 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
982 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
983 return buf;
984 }
985
986 bool os::getTimesSecs(double* process_real_time,
987 double* process_user_time,
988 double* process_system_time) {
989 HANDLE h_process = GetCurrentProcess();
990 FILETIME create_time, exit_time, kernel_time, user_time;
991 BOOL result = GetProcessTimes(h_process,
992 &create_time,
993 &exit_time,
994 &kernel_time,
995 &user_time);
996 if (result != 0) {
997 FILETIME wt;
998 GetSystemTimeAsFileTime(&wt);
999 jlong rtc_millis = windows_to_java_time(wt);
1000 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
1001 *process_user_time =
1002 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1003 *process_system_time =
1004 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1005 return true;
1006 } else {
1007 return false;
1008 }
1009 }
1010
1011 void os::shutdown() {
1012 // allow PerfMemory to attempt cleanup of any persistent resources
1013 perfMemory_exit();
1014
1015 // flush buffered output, finish log files
1016 ostream_abort();
1017
1018 // Check for abort hook
1019 abort_hook_t abort_hook = Arguments::abort_hook();
1020 if (abort_hook != NULL) {
1021 abort_hook();
1022 }
1023 }
1024
1025
1026 static HANDLE dumpFile = NULL;
1027
1028 // Check if dump file can be created.
1029 void os::check_dump_limit(char* buffer, size_t buffsz) {
1030 bool status = true;
1031 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1032 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1033 status = false;
1034 }
1035
1036 #ifndef ASSERT
1037 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1038 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1039 status = false;
1040 }
1041 #endif
1042
1043 if (status) {
1044 const char* cwd = get_current_directory(NULL, 0);
1045 int pid = current_process_id();
1046 if (cwd != NULL) {
1047 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1048 } else {
1049 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1050 }
1051
1052 if (dumpFile == NULL &&
1053 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1054 == INVALID_HANDLE_VALUE) {
1055 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1056 status = false;
1057 }
1058 }
1059 VMError::record_coredump_status(buffer, status);
1060 }
1061
1062 void os::abort(bool dump_core, void* siginfo, const void* context) {
1063 EXCEPTION_POINTERS ep;
1064 MINIDUMP_EXCEPTION_INFORMATION mei;
1065 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1066
1067 HANDLE hProcess = GetCurrentProcess();
1068 DWORD processId = GetCurrentProcessId();
1069 MINIDUMP_TYPE dumpType;
1070
1071 shutdown();
1072 if (!dump_core || dumpFile == NULL) {
1073 if (dumpFile != NULL) {
1074 CloseHandle(dumpFile);
1075 }
1076 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1077 }
1078
1079 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1080 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1081
1082 if (siginfo != NULL && context != NULL) {
1083 ep.ContextRecord = (PCONTEXT) context;
1084 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1085
1086 mei.ThreadId = GetCurrentThreadId();
1087 mei.ExceptionPointers = &ep;
1088 pmei = &mei;
1089 } else {
1090 pmei = NULL;
1091 }
1092
1093 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1094 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1095 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1096 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1097 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1098 }
1099 CloseHandle(dumpFile);
1100 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1101 }
1102
1103 // Die immediately, no exit hook, no abort hook, no cleanup.
1104 void os::die() {
1105 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1106 }
1107
1108 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1109 // * dirent_md.c 1.15 00/02/02
1110 //
1111 // The declarations for DIR and struct dirent are in jvm_win32.h.
1112
1113 // Caller must have already run dirname through JVM_NativePath, which removes
1114 // duplicate slashes and converts all instances of '/' into '\\'.
1115
1116 DIR * os::opendir(const char *dirname) {
1117 assert(dirname != NULL, "just checking"); // hotspot change
1118 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1119 DWORD fattr; // hotspot change
1120 char alt_dirname[4] = { 0, 0, 0, 0 };
1121
1122 if (dirp == 0) {
1123 errno = ENOMEM;
1124 return 0;
1125 }
1126
1127 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1128 // as a directory in FindFirstFile(). We detect this case here and
1129 // prepend the current drive name.
1130 //
1131 if (dirname[1] == '\0' && dirname[0] == '\\') {
1132 alt_dirname[0] = _getdrive() + 'A' - 1;
1133 alt_dirname[1] = ':';
1134 alt_dirname[2] = '\\';
1135 alt_dirname[3] = '\0';
1136 dirname = alt_dirname;
1137 }
1138
1139 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1140 if (dirp->path == 0) {
1141 free(dirp);
1142 errno = ENOMEM;
1143 return 0;
1144 }
1145 strcpy(dirp->path, dirname);
1146
1147 fattr = GetFileAttributes(dirp->path);
1148 if (fattr == 0xffffffff) {
1149 free(dirp->path);
1150 free(dirp);
1151 errno = ENOENT;
1152 return 0;
1153 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1154 free(dirp->path);
1155 free(dirp);
1156 errno = ENOTDIR;
1157 return 0;
1158 }
1159
1160 // Append "*.*", or possibly "\\*.*", to path
1161 if (dirp->path[1] == ':' &&
1162 (dirp->path[2] == '\0' ||
1163 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1164 // No '\\' needed for cases like "Z:" or "Z:\"
1165 strcat(dirp->path, "*.*");
1166 } else {
1167 strcat(dirp->path, "\\*.*");
1168 }
1169
1170 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1171 if (dirp->handle == INVALID_HANDLE_VALUE) {
1172 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1173 free(dirp->path);
1174 free(dirp);
1175 errno = EACCES;
1176 return 0;
1177 }
1178 }
1179 return dirp;
1180 }
1181
1182 struct dirent * os::readdir(DIR *dirp) {
1183 assert(dirp != NULL, "just checking"); // hotspot change
1184 if (dirp->handle == INVALID_HANDLE_VALUE) {
1185 return NULL;
1186 }
1187
1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1189
1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1191 if (GetLastError() == ERROR_INVALID_HANDLE) {
1192 errno = EBADF;
1193 return NULL;
1194 }
1195 FindClose(dirp->handle);
1196 dirp->handle = INVALID_HANDLE_VALUE;
1197 }
1198
1199 return &dirp->dirent;
1200 }
1201
1202 int os::closedir(DIR *dirp) {
1203 assert(dirp != NULL, "just checking"); // hotspot change
1204 if (dirp->handle != INVALID_HANDLE_VALUE) {
1205 if (!FindClose(dirp->handle)) {
1206 errno = EBADF;
1207 return -1;
1208 }
1209 dirp->handle = INVALID_HANDLE_VALUE;
1210 }
1211 free(dirp->path);
1212 free(dirp);
1213 return 0;
1214 }
1215
1216 // This must be hard coded because it's the system's temporary
1217 // directory not the java application's temp directory, ala java.io.tmpdir.
1218 const char* os::get_temp_directory() {
1219 static char path_buf[MAX_PATH];
1220 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1221 return path_buf;
1222 } else {
1223 path_buf[0] = '\0';
1224 return path_buf;
1225 }
1226 }
1227
1228 // Needs to be in os specific directory because windows requires another
1229 // header file <direct.h>
1230 const char* os::get_current_directory(char *buf, size_t buflen) {
1231 int n = static_cast<int>(buflen);
1232 if (buflen > INT_MAX) n = INT_MAX;
1233 return _getcwd(buf, n);
1234 }
1235
1236 //-----------------------------------------------------------
1237 // Helper functions for fatal error handler
1238 #ifdef _WIN64
1239 // Helper routine which returns true if address in
1240 // within the NTDLL address space.
1241 //
1242 static bool _addr_in_ntdll(address addr) {
1243 HMODULE hmod;
1244 MODULEINFO minfo;
1245
1246 hmod = GetModuleHandle("NTDLL.DLL");
1247 if (hmod == NULL) return false;
1248 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1249 &minfo, sizeof(MODULEINFO))) {
1250 return false;
1251 }
1252
1253 if ((addr >= minfo.lpBaseOfDll) &&
1254 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1255 return true;
1256 } else {
1257 return false;
1258 }
1259 }
1260 #endif
1261
1262 struct _modinfo {
1263 address addr;
1264 char* full_path; // point to a char buffer
1265 int buflen; // size of the buffer
1266 address base_addr;
1267 };
1268
1269 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1270 address top_address, void * param) {
1271 struct _modinfo *pmod = (struct _modinfo *)param;
1272 if (!pmod) return -1;
1273
1274 if (base_addr <= pmod->addr &&
1275 top_address > pmod->addr) {
1276 // if a buffer is provided, copy path name to the buffer
1277 if (pmod->full_path) {
1278 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1279 }
1280 pmod->base_addr = base_addr;
1281 return 1;
1282 }
1283 return 0;
1284 }
1285
1286 bool os::dll_address_to_library_name(address addr, char* buf,
1287 int buflen, int* offset) {
1288 // buf is not optional, but offset is optional
1289 assert(buf != NULL, "sanity check");
1290
1291 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1292 // return the full path to the DLL file, sometimes it returns path
1293 // to the corresponding PDB file (debug info); sometimes it only
1294 // returns partial path, which makes life painful.
1295
1296 struct _modinfo mi;
1297 mi.addr = addr;
1298 mi.full_path = buf;
1299 mi.buflen = buflen;
1300 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1301 // buf already contains path name
1302 if (offset) *offset = addr - mi.base_addr;
1303 return true;
1304 }
1305
1306 buf[0] = '\0';
1307 if (offset) *offset = -1;
1308 return false;
1309 }
1310
1311 bool os::dll_address_to_function_name(address addr, char *buf,
1312 int buflen, int *offset,
1313 bool demangle) {
1314 // buf is not optional, but offset is optional
1315 assert(buf != NULL, "sanity check");
1316
1317 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1318 return true;
1319 }
1320 if (offset != NULL) *offset = -1;
1321 buf[0] = '\0';
1322 return false;
1323 }
1324
1325 // save the start and end address of jvm.dll into param[0] and param[1]
1326 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1327 address top_address, void * param) {
1328 if (!param) return -1;
1329
1330 if (base_addr <= (address)_locate_jvm_dll &&
1331 top_address > (address)_locate_jvm_dll) {
1332 ((address*)param)[0] = base_addr;
1333 ((address*)param)[1] = top_address;
1334 return 1;
1335 }
1336 return 0;
1337 }
1338
1339 address vm_lib_location[2]; // start and end address of jvm.dll
1340
1341 // check if addr is inside jvm.dll
1342 bool os::address_is_in_vm(address addr) {
1343 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1344 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1345 assert(false, "Can't find jvm module.");
1346 return false;
1347 }
1348 }
1349
1350 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1351 }
1352
1353 // print module info; param is outputStream*
1354 static int _print_module(const char* fname, address base_address,
1355 address top_address, void* param) {
1356 if (!param) return -1;
1357
1358 outputStream* st = (outputStream*)param;
1359
1360 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1361 return 0;
1362 }
1363
1364 // Loads .dll/.so and
1365 // in case of error it checks if .dll/.so was built for the
1366 // same architecture as Hotspot is running on
1367 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1368 log_info(os)("attempting shared library load of %s", name);
1369
1370 void * result = LoadLibrary(name);
1371 if (result != NULL) {
1372 Events::log(NULL, "Loaded shared library %s", name);
1373 // Recalculate pdb search path if a DLL was loaded successfully.
1374 SymbolEngine::recalc_search_path();
1375 log_info(os)("shared library load of %s was successful", name);
1376 return result;
1377 }
1378 DWORD errcode = GetLastError();
1379 // Read system error message into ebuf
1380 // It may or may not be overwritten below (in the for loop and just above)
1381 lasterror(ebuf, (size_t) ebuflen);
1382 ebuf[ebuflen - 1] = '\0';
1383 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode);
1384 log_info(os)("shared library load of %s failed, error code %lu", name, errcode);
1385
1386 if (errcode == ERROR_MOD_NOT_FOUND) {
1387 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1388 ebuf[ebuflen - 1] = '\0';
1389 return NULL;
1390 }
1391
1392 // Parsing dll below
1393 // If we can read dll-info and find that dll was built
1394 // for an architecture other than Hotspot is running in
1395 // - then print to buffer "DLL was built for a different architecture"
1396 // else call os::lasterror to obtain system error message
1397 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1398 if (fd < 0) {
1399 return NULL;
1400 }
1401
1402 uint32_t signature_offset;
1403 uint16_t lib_arch = 0;
1404 bool failed_to_get_lib_arch =
1405 ( // Go to position 3c in the dll
1406 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1407 ||
1408 // Read location of signature
1409 (sizeof(signature_offset) !=
1410 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1411 ||
1412 // Go to COFF File Header in dll
1413 // that is located after "signature" (4 bytes long)
1414 (os::seek_to_file_offset(fd,
1415 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1416 ||
1417 // Read field that contains code of architecture
1418 // that dll was built for
1419 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1420 );
1421
1422 ::close(fd);
1423 if (failed_to_get_lib_arch) {
1424 // file i/o error - report os::lasterror(...) msg
1425 return NULL;
1426 }
1427
1428 typedef struct {
1429 uint16_t arch_code;
1430 char* arch_name;
1431 } arch_t;
1432
1433 static const arch_t arch_array[] = {
1434 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1435 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1436 };
1437 #if (defined _M_AMD64)
1438 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1439 #elif (defined _M_IX86)
1440 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1441 #else
1442 #error Method os::dll_load requires that one of following \
1443 is defined :_M_AMD64 or _M_IX86
1444 #endif
1445
1446
1447 // Obtain a string for printf operation
1448 // lib_arch_str shall contain string what platform this .dll was built for
1449 // running_arch_str shall string contain what platform Hotspot was built for
1450 char *running_arch_str = NULL, *lib_arch_str = NULL;
1451 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1452 if (lib_arch == arch_array[i].arch_code) {
1453 lib_arch_str = arch_array[i].arch_name;
1454 }
1455 if (running_arch == arch_array[i].arch_code) {
1456 running_arch_str = arch_array[i].arch_name;
1457 }
1458 }
1459
1460 assert(running_arch_str,
1461 "Didn't find running architecture code in arch_array");
1462
1463 // If the architecture is right
1464 // but some other error took place - report os::lasterror(...) msg
1465 if (lib_arch == running_arch) {
1466 return NULL;
1467 }
1468
1469 if (lib_arch_str != NULL) {
1470 ::_snprintf(ebuf, ebuflen - 1,
1471 "Can't load %s-bit .dll on a %s-bit platform",
1472 lib_arch_str, running_arch_str);
1473 } else {
1474 // don't know what architecture this dll was build for
1475 ::_snprintf(ebuf, ebuflen - 1,
1476 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1477 lib_arch, running_arch_str);
1478 }
1479
1480 return NULL;
1481 }
1482
1483 void os::print_dll_info(outputStream *st) {
1484 st->print_cr("Dynamic libraries:");
1485 get_loaded_modules_info(_print_module, (void *)st);
1486 }
1487
1488 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1489 HANDLE hProcess;
1490
1491 # define MAX_NUM_MODULES 128
1492 HMODULE modules[MAX_NUM_MODULES];
1493 static char filename[MAX_PATH];
1494 int result = 0;
1495
1496 int pid = os::current_process_id();
1497 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1498 FALSE, pid);
1499 if (hProcess == NULL) return 0;
1500
1501 DWORD size_needed;
1502 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1503 CloseHandle(hProcess);
1504 return 0;
1505 }
1506
1507 // number of modules that are currently loaded
1508 int num_modules = size_needed / sizeof(HMODULE);
1509
1510 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1511 // Get Full pathname:
1512 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1513 filename[0] = '\0';
1514 }
1515
1516 MODULEINFO modinfo;
1517 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1518 modinfo.lpBaseOfDll = NULL;
1519 modinfo.SizeOfImage = 0;
1520 }
1521
1522 // Invoke callback function
1523 result = callback(filename, (address)modinfo.lpBaseOfDll,
1524 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1525 if (result) break;
1526 }
1527
1528 CloseHandle(hProcess);
1529 return result;
1530 }
1531
1532 bool os::get_host_name(char* buf, size_t buflen) {
1533 DWORD size = (DWORD)buflen;
1534 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1535 }
1536
1537 void os::get_summary_os_info(char* buf, size_t buflen) {
1538 stringStream sst(buf, buflen);
1539 os::win32::print_windows_version(&sst);
1540 // chop off newline character
1541 char* nl = strchr(buf, '\n');
1542 if (nl != NULL) *nl = '\0';
1543 }
1544
1545 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1546 #if _MSC_VER >= 1900
1547 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1548 int result = ::vsnprintf(buf, len, fmt, args);
1549 // If an encoding error occurred (result < 0) then it's not clear
1550 // whether the buffer is NUL terminated, so ensure it is.
1551 if ((result < 0) && (len > 0)) {
1552 buf[len - 1] = '\0';
1553 }
1554 return result;
1555 #else
1556 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1557 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1558 // versions. However, when len == 0, avoid _vsnprintf too, and just
1559 // go straight to _vscprintf. The output is going to be truncated in
1560 // that case, except in the unusual case of empty output. More
1561 // importantly, the documentation for various versions of Visual Studio
1562 // are inconsistent about the behavior of _vsnprintf when len == 0,
1563 // including it possibly being an error.
1564 int result = -1;
1565 if (len > 0) {
1566 result = _vsnprintf(buf, len, fmt, args);
1567 // If output (including NUL terminator) is truncated, the buffer
1568 // won't be NUL terminated. Add the trailing NUL specified by C99.
1569 if ((result < 0) || ((size_t)result >= len)) {
1570 buf[len - 1] = '\0';
1571 }
1572 }
1573 if (result < 0) {
1574 result = _vscprintf(fmt, args);
1575 }
1576 return result;
1577 #endif // _MSC_VER dispatch
1578 }
1579
1580 static inline time_t get_mtime(const char* filename) {
1581 struct stat st;
1582 int ret = os::stat(filename, &st);
1583 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1584 return st.st_mtime;
1585 }
1586
1587 int os::compare_file_modified_times(const char* file1, const char* file2) {
1588 time_t t1 = get_mtime(file1);
1589 time_t t2 = get_mtime(file2);
1590 return t1 - t2;
1591 }
1592
1593 void os::print_os_info_brief(outputStream* st) {
1594 os::print_os_info(st);
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("OS:");
1608 os::win32::print_windows_version(st);
1609
1610 #ifdef _LP64
1611 VM_Version::print_platform_virtualization_info(st);
1612 #endif
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(n - 1, &pending_signals[i], n)) {
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 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2382 #ifdef _M_AMD64
2383 address pc = (address) exceptionInfo->ContextRecord->Rip;
2384 #else
2385 address pc = (address) exceptionInfo->ContextRecord->Eip;
2386 #endif
2387 Thread* t = Thread::current_or_null_safe();
2388
2389 // Handle SafeFetch32 and SafeFetchN exceptions.
2390 if (StubRoutines::is_safefetch_fault(pc)) {
2391 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2392 }
2393
2394 #ifndef _WIN64
2395 // Execution protection violation - win32 running on AMD64 only
2396 // Handled first to avoid misdiagnosis as a "normal" access violation;
2397 // This is safe to do because we have a new/unique ExceptionInformation
2398 // code for this condition.
2399 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2400 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2401 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2402 address addr = (address) exceptionRecord->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, exceptionInfo->ExceptionRecord,
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
2483 // Handle potential stack overflows up front.
2484 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2485 if (thread->stack_guards_enabled()) {
2486 if (in_java) {
2487 frame fr;
2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2489 address addr = (address) exceptionRecord->ExceptionInformation[1];
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(thread->thread_state() != _thread_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, exceptionInfo->ExceptionRecord,
2509 exceptionInfo->ContextRecord);
2510 return EXCEPTION_CONTINUE_SEARCH;
2511 }
2512 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2513 // Either stack overflow or null pointer exception.
2514 if (in_java) {
2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2516 address addr = (address) exceptionRecord->ExceptionInformation[1];
2517 address stack_end = thread->stack_end();
2518 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2519 // Stack overflow.
2520 assert(!os::uses_stack_guard_pages(),
2521 "should be caught by red zone code above.");
2522 return Handle_Exception(exceptionInfo,
2523 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2524 }
2525 // Check for safepoint polling and implicit null
2526 // We only expect null pointers in the stubs (vtable)
2527 // the rest are checked explicitly now.
2528 CodeBlob* cb = CodeCache::find_blob(pc);
2529 if (cb != NULL) {
2530 if (os::is_poll_address(addr)) {
2531 address stub = SharedRuntime::get_poll_stub(pc);
2532 return Handle_Exception(exceptionInfo, stub);
2533 }
2534 }
2535 {
2536 #ifdef _WIN64
2537 // If it's a legal stack address map the entire region in
2538 //
2539 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2540 address addr = (address) exceptionRecord->ExceptionInformation[1];
2541 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2542 addr = (address)((uintptr_t)addr &
2543 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2544 os::commit_memory((char *)addr, thread->stack_base() - addr,
2545 !ExecMem);
2546 return EXCEPTION_CONTINUE_EXECUTION;
2547 } else
2548 #endif
2549 {
2550 // Null pointer exception.
2551 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2552 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2553 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2554 }
2555 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2556 exceptionInfo->ContextRecord);
2557 return EXCEPTION_CONTINUE_SEARCH;
2558 }
2559 }
2560 }
2561
2562 #ifdef _WIN64
2563 // Special care for fast JNI field accessors.
2564 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2565 // in and the heap gets shrunk before the field access.
2566 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2567 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2568 if (addr != (address)-1) {
2569 return Handle_Exception(exceptionInfo, addr);
2570 }
2571 }
2572 #endif
2573
2574 // Stack overflow or null pointer exception in native code.
2575 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2576 exceptionInfo->ContextRecord);
2577 return EXCEPTION_CONTINUE_SEARCH;
2578 } // /EXCEPTION_ACCESS_VIOLATION
2579 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2580
2581 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2582 CompiledMethod* nm = NULL;
2583 JavaThread* thread = (JavaThread*)t;
2584 if (in_java) {
2585 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2586 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2587 }
2588
2589 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc);
2590 if (((thread->thread_state() == _thread_in_vm ||
2591 thread->thread_state() == _thread_in_native ||
2592 is_unsafe_arraycopy) &&
2593 thread->doing_unsafe_access()) ||
2594 (nm != NULL && nm->has_unsafe_access())) {
2595 address next_pc = Assembler::locate_next_instruction(pc);
2596 if (is_unsafe_arraycopy) {
2597 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
2598 }
2599 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc));
2600 }
2601 }
2602
2603 if (in_java) {
2604 switch (exception_code) {
2605 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2606 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2607
2608 case EXCEPTION_INT_OVERFLOW:
2609 return Handle_IDiv_Exception(exceptionInfo);
2610
2611 } // switch
2612 }
2613 if (((thread->thread_state() == _thread_in_Java) ||
2614 (thread->thread_state() == _thread_in_native)) &&
2615 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2616 LONG result=Handle_FLT_Exception(exceptionInfo);
2617 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2618 }
2619 }
2620
2621 if (exception_code != EXCEPTION_BREAKPOINT) {
2622 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2623 exceptionInfo->ContextRecord);
2624 }
2625 return EXCEPTION_CONTINUE_SEARCH;
2626 }
2627
2628 #ifndef _WIN64
2629 // Special care for fast JNI accessors.
2630 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2631 // the heap gets shrunk before the field access.
2632 // Need to install our own structured exception handler since native code may
2633 // install its own.
2634 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2635 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2636 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2637 address pc = (address) exceptionInfo->ContextRecord->Eip;
2638 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2639 if (addr != (address)-1) {
2640 return Handle_Exception(exceptionInfo, addr);
2641 }
2642 }
2643 return EXCEPTION_CONTINUE_SEARCH;
2644 }
2645
2646 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2647 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2648 jobject obj, \
2649 jfieldID fieldID) { \
2650 __try { \
2651 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2652 obj, \
2653 fieldID); \
2654 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2655 _exception_info())) { \
2656 } \
2657 return 0; \
2658 }
2659
2660 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2661 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2662 DEFINE_FAST_GETFIELD(jchar, char, Char)
2663 DEFINE_FAST_GETFIELD(jshort, short, Short)
2664 DEFINE_FAST_GETFIELD(jint, int, Int)
2665 DEFINE_FAST_GETFIELD(jlong, long, Long)
2666 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2667 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2668
2669 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2670 switch (type) {
2671 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2672 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2673 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2674 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2675 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2676 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2677 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2678 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2679 default: ShouldNotReachHere();
2680 }
2681 return (address)-1;
2682 }
2683 #endif
2684
2685 // Virtual Memory
2686
2687 int os::vm_page_size() { return os::win32::vm_page_size(); }
2688 int os::vm_allocation_granularity() {
2689 return os::win32::vm_allocation_granularity();
2690 }
2691
2692 // Windows large page support is available on Windows 2003. In order to use
2693 // large page memory, the administrator must first assign additional privilege
2694 // to the user:
2695 // + select Control Panel -> Administrative Tools -> Local Security Policy
2696 // + select Local Policies -> User Rights Assignment
2697 // + double click "Lock pages in memory", add users and/or groups
2698 // + reboot
2699 // Note the above steps are needed for administrator as well, as administrators
2700 // by default do not have the privilege to lock pages in memory.
2701 //
2702 // Note about Windows 2003: although the API supports committing large page
2703 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2704 // scenario, I found through experiment it only uses large page if the entire
2705 // memory region is reserved and committed in a single VirtualAlloc() call.
2706 // This makes Windows large page support more or less like Solaris ISM, in
2707 // that the entire heap must be committed upfront. This probably will change
2708 // in the future, if so the code below needs to be revisited.
2709
2710 #ifndef MEM_LARGE_PAGES
2711 #define MEM_LARGE_PAGES 0x20000000
2712 #endif
2713
2714 static HANDLE _hProcess;
2715 static HANDLE _hToken;
2716
2717 // Container for NUMA node list info
2718 class NUMANodeListHolder {
2719 private:
2720 int *_numa_used_node_list; // allocated below
2721 int _numa_used_node_count;
2722
2723 void free_node_list() {
2724 if (_numa_used_node_list != NULL) {
2725 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2726 }
2727 }
2728
2729 public:
2730 NUMANodeListHolder() {
2731 _numa_used_node_count = 0;
2732 _numa_used_node_list = NULL;
2733 // do rest of initialization in build routine (after function pointers are set up)
2734 }
2735
2736 ~NUMANodeListHolder() {
2737 free_node_list();
2738 }
2739
2740 bool build() {
2741 DWORD_PTR proc_aff_mask;
2742 DWORD_PTR sys_aff_mask;
2743 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2744 ULONG highest_node_number;
2745 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2746 free_node_list();
2747 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2748 for (unsigned int i = 0; i <= highest_node_number; i++) {
2749 ULONGLONG proc_mask_numa_node;
2750 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2751 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2752 _numa_used_node_list[_numa_used_node_count++] = i;
2753 }
2754 }
2755 return (_numa_used_node_count > 1);
2756 }
2757
2758 int get_count() { return _numa_used_node_count; }
2759 int get_node_list_entry(int n) {
2760 // for indexes out of range, returns -1
2761 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2762 }
2763
2764 } numa_node_list_holder;
2765
2766
2767
2768 static size_t _large_page_size = 0;
2769
2770 static bool request_lock_memory_privilege() {
2771 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2772 os::current_process_id());
2773
2774 LUID luid;
2775 if (_hProcess != NULL &&
2776 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2777 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2778
2779 TOKEN_PRIVILEGES tp;
2780 tp.PrivilegeCount = 1;
2781 tp.Privileges[0].Luid = luid;
2782 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2783
2784 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2785 // privilege. Check GetLastError() too. See MSDN document.
2786 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2787 (GetLastError() == ERROR_SUCCESS)) {
2788 return true;
2789 }
2790 }
2791
2792 return false;
2793 }
2794
2795 static void cleanup_after_large_page_init() {
2796 if (_hProcess) CloseHandle(_hProcess);
2797 _hProcess = NULL;
2798 if (_hToken) CloseHandle(_hToken);
2799 _hToken = NULL;
2800 }
2801
2802 static bool numa_interleaving_init() {
2803 bool success = false;
2804 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2805
2806 // print a warning if UseNUMAInterleaving flag is specified on command line
2807 bool warn_on_failure = use_numa_interleaving_specified;
2808 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2809
2810 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2811 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2812 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2813
2814 if (numa_node_list_holder.build()) {
2815 if (log_is_enabled(Debug, os, cpu)) {
2816 Log(os, cpu) log;
2817 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2818 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2819 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2820 }
2821 }
2822 success = true;
2823 } else {
2824 WARN("Process does not cover multiple NUMA nodes.");
2825 }
2826 if (!success) {
2827 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2828 }
2829 return success;
2830 #undef WARN
2831 }
2832
2833 // this routine is used whenever we need to reserve a contiguous VA range
2834 // but we need to make separate VirtualAlloc calls for each piece of the range
2835 // Reasons for doing this:
2836 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2837 // * UseNUMAInterleaving requires a separate node for each piece
2838 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2839 DWORD prot,
2840 bool should_inject_error = false) {
2841 char * p_buf;
2842 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2843 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2844 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2845
2846 // first reserve enough address space in advance since we want to be
2847 // able to break a single contiguous virtual address range into multiple
2848 // large page commits but WS2003 does not allow reserving large page space
2849 // so we just use 4K pages for reserve, this gives us a legal contiguous
2850 // address space. then we will deallocate that reservation, and re alloc
2851 // using large pages
2852 const size_t size_of_reserve = bytes + chunk_size;
2853 if (bytes > size_of_reserve) {
2854 // Overflowed.
2855 return NULL;
2856 }
2857 p_buf = (char *) VirtualAlloc(addr,
2858 size_of_reserve, // size of Reserve
2859 MEM_RESERVE,
2860 PAGE_READWRITE);
2861 // If reservation failed, return NULL
2862 if (p_buf == NULL) return NULL;
2863 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2864 os::release_memory(p_buf, bytes + chunk_size);
2865
2866 // we still need to round up to a page boundary (in case we are using large pages)
2867 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2868 // instead we handle this in the bytes_to_rq computation below
2869 p_buf = align_up(p_buf, page_size);
2870
2871 // now go through and allocate one chunk at a time until all bytes are
2872 // allocated
2873 size_t bytes_remaining = bytes;
2874 // An overflow of align_up() would have been caught above
2875 // in the calculation of size_of_reserve.
2876 char * next_alloc_addr = p_buf;
2877 HANDLE hProc = GetCurrentProcess();
2878
2879 #ifdef ASSERT
2880 // Variable for the failure injection
2881 int ran_num = os::random();
2882 size_t fail_after = ran_num % bytes;
2883 #endif
2884
2885 int count=0;
2886 while (bytes_remaining) {
2887 // select bytes_to_rq to get to the next chunk_size boundary
2888
2889 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2890 // Note allocate and commit
2891 char * p_new;
2892
2893 #ifdef ASSERT
2894 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2895 #else
2896 const bool inject_error_now = false;
2897 #endif
2898
2899 if (inject_error_now) {
2900 p_new = NULL;
2901 } else {
2902 if (!UseNUMAInterleaving) {
2903 p_new = (char *) VirtualAlloc(next_alloc_addr,
2904 bytes_to_rq,
2905 flags,
2906 prot);
2907 } else {
2908 // get the next node to use from the used_node_list
2909 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2910 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2911 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2912 }
2913 }
2914
2915 if (p_new == NULL) {
2916 // Free any allocated pages
2917 if (next_alloc_addr > p_buf) {
2918 // Some memory was committed so release it.
2919 size_t bytes_to_release = bytes - bytes_remaining;
2920 // NMT has yet to record any individual blocks, so it
2921 // need to create a dummy 'reserve' record to match
2922 // the release.
2923 MemTracker::record_virtual_memory_reserve((address)p_buf,
2924 bytes_to_release, CALLER_PC);
2925 os::release_memory(p_buf, bytes_to_release);
2926 }
2927 #ifdef ASSERT
2928 if (should_inject_error) {
2929 log_develop_debug(pagesize)("Reserving pages individually failed.");
2930 }
2931 #endif
2932 return NULL;
2933 }
2934
2935 bytes_remaining -= bytes_to_rq;
2936 next_alloc_addr += bytes_to_rq;
2937 count++;
2938 }
2939 // Although the memory is allocated individually, it is returned as one.
2940 // NMT records it as one block.
2941 if ((flags & MEM_COMMIT) != 0) {
2942 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2943 } else {
2944 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2945 }
2946
2947 // made it this far, success
2948 return p_buf;
2949 }
2950
2951
2952
2953 void os::large_page_init() {
2954 if (!UseLargePages) return;
2955
2956 // print a warning if any large page related flag is specified on command line
2957 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2958 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2959 bool success = false;
2960
2961 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2962 if (request_lock_memory_privilege()) {
2963 size_t s = GetLargePageMinimum();
2964 if (s) {
2965 #if defined(IA32) || defined(AMD64)
2966 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2967 WARN("JVM cannot use large pages bigger than 4mb.");
2968 } else {
2969 #endif
2970 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2971 _large_page_size = LargePageSizeInBytes;
2972 } else {
2973 _large_page_size = s;
2974 }
2975 success = true;
2976 #if defined(IA32) || defined(AMD64)
2977 }
2978 #endif
2979 } else {
2980 WARN("Large page is not supported by the processor.");
2981 }
2982 } else {
2983 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2984 }
2985 #undef WARN
2986
2987 const size_t default_page_size = (size_t) vm_page_size();
2988 if (success && _large_page_size > default_page_size) {
2989 _page_sizes[0] = _large_page_size;
2990 _page_sizes[1] = default_page_size;
2991 _page_sizes[2] = 0;
2992 }
2993
2994 cleanup_after_large_page_init();
2995 UseLargePages = success;
2996 }
2997
2998 int os::create_file_for_heap(const char* dir) {
2999
3000 const char name_template[] = "/jvmheap.XXXXXX";
3001
3002 size_t fullname_len = strlen(dir) + strlen(name_template);
3003 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
3004 if (fullname == NULL) {
3005 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
3006 return -1;
3007 }
3008 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
3009 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
3010
3011 os::native_path(fullname);
3012
3013 char *path = _mktemp(fullname);
3014 if (path == NULL) {
3015 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3016 os::free(fullname);
3017 return -1;
3018 }
3019
3020 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3021
3022 os::free(fullname);
3023 if (fd < 0) {
3024 warning("Problem opening file for heap (%s)", os::strerror(errno));
3025 return -1;
3026 }
3027 return fd;
3028 }
3029
3030 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3031 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3032 assert(fd != -1, "File descriptor is not valid");
3033
3034 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3035 #ifdef _LP64
3036 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3037 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3038 #else
3039 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3040 0, (DWORD)size, NULL);
3041 #endif
3042 if (fileMapping == NULL) {
3043 if (GetLastError() == ERROR_DISK_FULL) {
3044 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3045 }
3046 else {
3047 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3048 }
3049
3050 return NULL;
3051 }
3052
3053 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3054
3055 CloseHandle(fileMapping);
3056
3057 return (char*)addr;
3058 }
3059
3060 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3061 assert(fd != -1, "File descriptor is not valid");
3062 assert(base != NULL, "Base address cannot be NULL");
3063
3064 release_memory(base, size);
3065 return map_memory_to_file(base, size, fd);
3066 }
3067
3068 // On win32, one cannot release just a part of reserved memory, it's an
3069 // all or nothing deal. When we split a reservation, we must break the
3070 // reservation into two reservations.
3071 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3072 bool realloc) {
3073 if (size > 0) {
3074 release_memory(base, size);
3075 if (realloc) {
3076 reserve_memory(split, base);
3077 }
3078 if (size != split) {
3079 reserve_memory(size - split, base + split);
3080 }
3081 }
3082 }
3083
3084 // Multiple threads can race in this code but it's not possible to unmap small sections of
3085 // virtual space to get requested alignment, like posix-like os's.
3086 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3087 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3088 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3089 "Alignment must be a multiple of allocation granularity (page size)");
3090 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3091
3092 size_t extra_size = size + alignment;
3093 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3094
3095 char* aligned_base = NULL;
3096
3097 do {
3098 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3099 if (extra_base == NULL) {
3100 return NULL;
3101 }
3102 // Do manual alignment
3103 aligned_base = align_up(extra_base, alignment);
3104
3105 if (file_desc != -1) {
3106 os::unmap_memory(extra_base, extra_size);
3107 } else {
3108 os::release_memory(extra_base, extra_size);
3109 }
3110
3111 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3112
3113 } while (aligned_base == NULL);
3114
3115 return aligned_base;
3116 }
3117
3118 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3119 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3120 "reserve alignment");
3121 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3122 char* res;
3123 // note that if UseLargePages is on, all the areas that require interleaving
3124 // will go thru reserve_memory_special rather than thru here.
3125 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3126 if (!use_individual) {
3127 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3128 } else {
3129 elapsedTimer reserveTimer;
3130 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3131 // in numa interleaving, we have to allocate pages individually
3132 // (well really chunks of NUMAInterleaveGranularity size)
3133 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3134 if (res == NULL) {
3135 warning("NUMA page allocation failed");
3136 }
3137 if (Verbose && PrintMiscellaneous) {
3138 reserveTimer.stop();
3139 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3140 reserveTimer.milliseconds(), reserveTimer.ticks());
3141 }
3142 }
3143 assert(res == NULL || addr == NULL || addr == res,
3144 "Unexpected address from reserve.");
3145
3146 return res;
3147 }
3148
3149 // Reserve memory at an arbitrary address, only if that area is
3150 // available (and not reserved for something else).
3151 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3152 // Windows os::reserve_memory() fails of the requested address range is
3153 // not avilable.
3154 return reserve_memory(bytes, requested_addr);
3155 }
3156
3157 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3158 assert(file_desc >= 0, "file_desc is not valid");
3159 return map_memory_to_file(requested_addr, bytes, file_desc);
3160 }
3161
3162 size_t os::large_page_size() {
3163 return _large_page_size;
3164 }
3165
3166 bool os::can_commit_large_page_memory() {
3167 // Windows only uses large page memory when the entire region is reserved
3168 // and committed in a single VirtualAlloc() call. This may change in the
3169 // future, but with Windows 2003 it's not possible to commit on demand.
3170 return false;
3171 }
3172
3173 bool os::can_execute_large_page_memory() {
3174 return true;
3175 }
3176
3177 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3178 bool exec) {
3179 assert(UseLargePages, "only for large pages");
3180
3181 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3182 return NULL; // Fallback to small pages.
3183 }
3184
3185 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3186 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3187
3188 // with large pages, there are two cases where we need to use Individual Allocation
3189 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3190 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3191 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3192 log_debug(pagesize)("Reserving large pages individually.");
3193
3194 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3195 if (p_buf == NULL) {
3196 // give an appropriate warning message
3197 if (UseNUMAInterleaving) {
3198 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3199 }
3200 if (UseLargePagesIndividualAllocation) {
3201 warning("Individually allocated large pages failed, "
3202 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3203 }
3204 return NULL;
3205 }
3206
3207 return p_buf;
3208
3209 } else {
3210 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3211
3212 // normal policy just allocate it all at once
3213 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3214 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3215 if (res != NULL) {
3216 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3217 }
3218
3219 return res;
3220 }
3221 }
3222
3223 bool os::release_memory_special(char* base, size_t bytes) {
3224 assert(base != NULL, "Sanity check");
3225 return release_memory(base, bytes);
3226 }
3227
3228 void os::print_statistics() {
3229 }
3230
3231 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3232 int err = os::get_last_error();
3233 char buf[256];
3234 size_t buf_len = os::lasterror(buf, sizeof(buf));
3235 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3236 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3237 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3238 }
3239
3240 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3241 if (bytes == 0) {
3242 // Don't bother the OS with noops.
3243 return true;
3244 }
3245 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3246 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3247 // Don't attempt to print anything if the OS call fails. We're
3248 // probably low on resources, so the print itself may cause crashes.
3249
3250 // unless we have NUMAInterleaving enabled, the range of a commit
3251 // is always within a reserve covered by a single VirtualAlloc
3252 // in that case we can just do a single commit for the requested size
3253 if (!UseNUMAInterleaving) {
3254 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3255 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3256 return false;
3257 }
3258 if (exec) {
3259 DWORD oldprot;
3260 // Windows doc says to use VirtualProtect to get execute permissions
3261 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3262 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3263 return false;
3264 }
3265 }
3266 return true;
3267 } else {
3268
3269 // when NUMAInterleaving is enabled, the commit might cover a range that
3270 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3271 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3272 // returns represents the number of bytes that can be committed in one step.
3273 size_t bytes_remaining = bytes;
3274 char * next_alloc_addr = addr;
3275 while (bytes_remaining > 0) {
3276 MEMORY_BASIC_INFORMATION alloc_info;
3277 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3278 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3279 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3280 PAGE_READWRITE) == NULL) {
3281 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3282 exec);)
3283 return false;
3284 }
3285 if (exec) {
3286 DWORD oldprot;
3287 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3288 PAGE_EXECUTE_READWRITE, &oldprot)) {
3289 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3290 exec);)
3291 return false;
3292 }
3293 }
3294 bytes_remaining -= bytes_to_rq;
3295 next_alloc_addr += bytes_to_rq;
3296 }
3297 }
3298 // if we made it this far, return true
3299 return true;
3300 }
3301
3302 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3303 bool exec) {
3304 // alignment_hint is ignored on this OS
3305 return pd_commit_memory(addr, size, exec);
3306 }
3307
3308 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3309 const char* mesg) {
3310 assert(mesg != NULL, "mesg must be specified");
3311 if (!pd_commit_memory(addr, size, exec)) {
3312 warn_fail_commit_memory(addr, size, exec);
3313 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3314 }
3315 }
3316
3317 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3318 size_t alignment_hint, bool exec,
3319 const char* mesg) {
3320 // alignment_hint is ignored on this OS
3321 pd_commit_memory_or_exit(addr, size, exec, mesg);
3322 }
3323
3324 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3325 if (bytes == 0) {
3326 // Don't bother the OS with noops.
3327 return true;
3328 }
3329 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3330 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3331 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3332 }
3333
3334 bool os::pd_release_memory(char* addr, size_t bytes) {
3335 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3336 }
3337
3338 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3339 return os::commit_memory(addr, size, !ExecMem);
3340 }
3341
3342 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3343 return os::uncommit_memory(addr, size);
3344 }
3345
3346 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3347 uint count = 0;
3348 bool ret = false;
3349 size_t bytes_remaining = bytes;
3350 char * next_protect_addr = addr;
3351
3352 // Use VirtualQuery() to get the chunk size.
3353 while (bytes_remaining) {
3354 MEMORY_BASIC_INFORMATION alloc_info;
3355 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3356 return false;
3357 }
3358
3359 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3360 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3361 // but we don't distinguish here as both cases are protected by same API.
3362 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3363 warning("Failed protecting pages individually for chunk #%u", count);
3364 if (!ret) {
3365 return false;
3366 }
3367
3368 bytes_remaining -= bytes_to_protect;
3369 next_protect_addr += bytes_to_protect;
3370 count++;
3371 }
3372 return ret;
3373 }
3374
3375 // Set protections specified
3376 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3377 bool is_committed) {
3378 unsigned int p = 0;
3379 switch (prot) {
3380 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3381 case MEM_PROT_READ: p = PAGE_READONLY; break;
3382 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3383 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3384 default:
3385 ShouldNotReachHere();
3386 }
3387
3388 DWORD old_status;
3389
3390 // Strange enough, but on Win32 one can change protection only for committed
3391 // memory, not a big deal anyway, as bytes less or equal than 64K
3392 if (!is_committed) {
3393 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3394 "cannot commit protection page");
3395 }
3396 // One cannot use os::guard_memory() here, as on Win32 guard page
3397 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3398 //
3399 // Pages in the region become guard pages. Any attempt to access a guard page
3400 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3401 // the guard page status. Guard pages thus act as a one-time access alarm.
3402 bool ret;
3403 if (UseNUMAInterleaving) {
3404 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3405 // so we must protect the chunks individually.
3406 ret = protect_pages_individually(addr, bytes, p, &old_status);
3407 } else {
3408 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3409 }
3410 #ifdef ASSERT
3411 if (!ret) {
3412 int err = os::get_last_error();
3413 char buf[256];
3414 size_t buf_len = os::lasterror(buf, sizeof(buf));
3415 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3416 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3417 buf_len != 0 ? buf : "<no_error_string>", err);
3418 }
3419 #endif
3420 return ret;
3421 }
3422
3423 bool os::guard_memory(char* addr, size_t bytes) {
3424 DWORD old_status;
3425 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3426 }
3427
3428 bool os::unguard_memory(char* addr, size_t bytes) {
3429 DWORD old_status;
3430 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3431 }
3432
3433 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3434 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3435 void os::numa_make_global(char *addr, size_t bytes) { }
3436 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3437 bool os::numa_topology_changed() { return false; }
3438 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3439 int os::numa_get_group_id() { return 0; }
3440 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3441 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3442 // Provide an answer for UMA systems
3443 ids[0] = 0;
3444 return 1;
3445 } else {
3446 // check for size bigger than actual groups_num
3447 size = MIN2(size, numa_get_groups_num());
3448 for (int i = 0; i < (int)size; i++) {
3449 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3450 }
3451 return size;
3452 }
3453 }
3454
3455 bool os::get_page_info(char *start, page_info* info) {
3456 return false;
3457 }
3458
3459 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3460 page_info* page_found) {
3461 return end;
3462 }
3463
3464 char* os::non_memory_address_word() {
3465 // Must never look like an address returned by reserve_memory,
3466 // even in its subfields (as defined by the CPU immediate fields,
3467 // if the CPU splits constants across multiple instructions).
3468 return (char*)-1;
3469 }
3470
3471 #define MAX_ERROR_COUNT 100
3472 #define SYS_THREAD_ERROR 0xffffffffUL
3473
3474 void os::pd_start_thread(Thread* thread) {
3475 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3476 // Returns previous suspend state:
3477 // 0: Thread was not suspended
3478 // 1: Thread is running now
3479 // >1: Thread is still suspended.
3480 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3481 }
3482
3483 class HighResolutionInterval : public CHeapObj<mtThread> {
3484 // The default timer resolution seems to be 10 milliseconds.
3485 // (Where is this written down?)
3486 // If someone wants to sleep for only a fraction of the default,
3487 // then we set the timer resolution down to 1 millisecond for
3488 // the duration of their interval.
3489 // We carefully set the resolution back, since otherwise we
3490 // seem to incur an overhead (3%?) that we don't need.
3491 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3492 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3493 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3494 // timeBeginPeriod() if the relative error exceeded some threshold.
3495 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3496 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3497 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3498 // resolution timers running.
3499 private:
3500 jlong resolution;
3501 public:
3502 HighResolutionInterval(jlong ms) {
3503 resolution = ms % 10L;
3504 if (resolution != 0) {
3505 MMRESULT result = timeBeginPeriod(1L);
3506 }
3507 }
3508 ~HighResolutionInterval() {
3509 if (resolution != 0) {
3510 MMRESULT result = timeEndPeriod(1L);
3511 }
3512 resolution = 0L;
3513 }
3514 };
3515
3516 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3517 jlong limit = (jlong) MAXDWORD;
3518
3519 while (ms > limit) {
3520 int res;
3521 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3522 return res;
3523 }
3524 ms -= limit;
3525 }
3526
3527 assert(thread == Thread::current(), "thread consistency check");
3528 OSThread* osthread = thread->osthread();
3529 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3530 int result;
3531 if (interruptable) {
3532 assert(thread->is_Java_thread(), "must be java thread");
3533 JavaThread *jt = (JavaThread *) thread;
3534 ThreadBlockInVM tbivm(jt);
3535
3536 jt->set_suspend_equivalent();
3537 // cleared by handle_special_suspend_equivalent_condition() or
3538 // java_suspend_self() via check_and_wait_while_suspended()
3539
3540 HANDLE events[1];
3541 events[0] = osthread->interrupt_event();
3542 HighResolutionInterval *phri=NULL;
3543 if (!ForceTimeHighResolution) {
3544 phri = new HighResolutionInterval(ms);
3545 }
3546 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3547 result = OS_TIMEOUT;
3548 } else {
3549 ResetEvent(osthread->interrupt_event());
3550 osthread->set_interrupted(false);
3551 result = OS_INTRPT;
3552 }
3553 delete phri; //if it is NULL, harmless
3554
3555 // were we externally suspended while we were waiting?
3556 jt->check_and_wait_while_suspended();
3557 } else {
3558 assert(!thread->is_Java_thread(), "must not be java thread");
3559 Sleep((long) ms);
3560 result = OS_TIMEOUT;
3561 }
3562 return result;
3563 }
3564
3565 // Short sleep, direct OS call.
3566 //
3567 // ms = 0, means allow others (if any) to run.
3568 //
3569 void os::naked_short_sleep(jlong ms) {
3570 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3571 Sleep(ms);
3572 }
3573
3574 // Windows does not provide sleep functionality with nanosecond resolution, so we
3575 // try to approximate this with spinning combined with yielding if another thread
3576 // is ready to run on the current processor.
3577 void os::naked_short_nanosleep(jlong ns) {
3578 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3579
3580 int64_t start = os::javaTimeNanos();
3581 do {
3582 if (SwitchToThread() == 0) {
3583 // Nothing else is ready to run on this cpu, spin a little
3584 SpinPause();
3585 }
3586 } while (os::javaTimeNanos() - start < ns);
3587 }
3588
3589 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3590 void os::infinite_sleep() {
3591 while (true) { // sleep forever ...
3592 Sleep(100000); // ... 100 seconds at a time
3593 }
3594 }
3595
3596 typedef BOOL (WINAPI * STTSignature)(void);
3597
3598 void os::naked_yield() {
3599 // Consider passing back the return value from SwitchToThread().
3600 SwitchToThread();
3601 }
3602
3603 // Win32 only gives you access to seven real priorities at a time,
3604 // so we compress Java's ten down to seven. It would be better
3605 // if we dynamically adjusted relative priorities.
3606
3607 int os::java_to_os_priority[CriticalPriority + 1] = {
3608 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3609 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3610 THREAD_PRIORITY_LOWEST, // 2
3611 THREAD_PRIORITY_BELOW_NORMAL, // 3
3612 THREAD_PRIORITY_BELOW_NORMAL, // 4
3613 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3614 THREAD_PRIORITY_NORMAL, // 6
3615 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3616 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3617 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3618 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3619 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3620 };
3621
3622 int prio_policy1[CriticalPriority + 1] = {
3623 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3624 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3625 THREAD_PRIORITY_LOWEST, // 2
3626 THREAD_PRIORITY_BELOW_NORMAL, // 3
3627 THREAD_PRIORITY_BELOW_NORMAL, // 4
3628 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3629 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3630 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3631 THREAD_PRIORITY_HIGHEST, // 8
3632 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3633 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3634 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3635 };
3636
3637 static int prio_init() {
3638 // If ThreadPriorityPolicy is 1, switch tables
3639 if (ThreadPriorityPolicy == 1) {
3640 int i;
3641 for (i = 0; i < CriticalPriority + 1; i++) {
3642 os::java_to_os_priority[i] = prio_policy1[i];
3643 }
3644 }
3645 if (UseCriticalJavaThreadPriority) {
3646 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3647 }
3648 return 0;
3649 }
3650
3651 OSReturn os::set_native_priority(Thread* thread, int priority) {
3652 if (!UseThreadPriorities) return OS_OK;
3653 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3654 return ret ? OS_OK : OS_ERR;
3655 }
3656
3657 OSReturn os::get_native_priority(const Thread* const thread,
3658 int* priority_ptr) {
3659 if (!UseThreadPriorities) {
3660 *priority_ptr = java_to_os_priority[NormPriority];
3661 return OS_OK;
3662 }
3663 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3664 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3665 assert(false, "GetThreadPriority failed");
3666 return OS_ERR;
3667 }
3668 *priority_ptr = os_prio;
3669 return OS_OK;
3670 }
3671
3672 void os::interrupt(Thread* thread) {
3673 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3674
3675 OSThread* osthread = thread->osthread();
3676 osthread->set_interrupted(true);
3677 // More than one thread can get here with the same value of osthread,
3678 // resulting in multiple notifications. We do, however, want the store
3679 // to interrupted() to be visible to other threads before we post
3680 // the interrupt event.
3681 OrderAccess::release();
3682 SetEvent(osthread->interrupt_event());
3683 // For JSR166: unpark after setting status
3684 if (thread->is_Java_thread()) {
3685 ((JavaThread*)thread)->parker()->unpark();
3686 }
3687
3688 ParkEvent * ev = thread->_ParkEvent;
3689 if (ev != NULL) ev->unpark();
3690 }
3691
3692
3693 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3694 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3695
3696 OSThread* osthread = thread->osthread();
3697 // There is no synchronization between the setting of the interrupt
3698 // and it being cleared here. It is critical - see 6535709 - that
3699 // we only clear the interrupt state, and reset the interrupt event,
3700 // if we are going to report that we were indeed interrupted - else
3701 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3702 // depending on the timing. By checking thread interrupt event to see
3703 // if the thread gets real interrupt thus prevent spurious wakeup.
3704 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3705 if (interrupted && clear_interrupted) {
3706 osthread->set_interrupted(false);
3707 ResetEvent(osthread->interrupt_event());
3708 } // Otherwise leave the interrupted state alone
3709
3710 return interrupted;
3711 }
3712
3713 // GetCurrentThreadId() returns DWORD
3714 intx os::current_thread_id() { return GetCurrentThreadId(); }
3715
3716 static int _initial_pid = 0;
3717
3718 int os::current_process_id() {
3719 return (_initial_pid ? _initial_pid : _getpid());
3720 }
3721
3722 int os::win32::_vm_page_size = 0;
3723 int os::win32::_vm_allocation_granularity = 0;
3724 int os::win32::_processor_type = 0;
3725 // Processor level is not available on non-NT systems, use vm_version instead
3726 int os::win32::_processor_level = 0;
3727 julong os::win32::_physical_memory = 0;
3728 size_t os::win32::_default_stack_size = 0;
3729
3730 intx os::win32::_os_thread_limit = 0;
3731 volatile intx os::win32::_os_thread_count = 0;
3732
3733 bool os::win32::_is_windows_server = false;
3734
3735 // 6573254
3736 // Currently, the bug is observed across all the supported Windows releases,
3737 // including the latest one (as of this writing - Windows Server 2012 R2)
3738 bool os::win32::_has_exit_bug = true;
3739
3740 void os::win32::initialize_system_info() {
3741 SYSTEM_INFO si;
3742 GetSystemInfo(&si);
3743 _vm_page_size = si.dwPageSize;
3744 _vm_allocation_granularity = si.dwAllocationGranularity;
3745 _processor_type = si.dwProcessorType;
3746 _processor_level = si.wProcessorLevel;
3747 set_processor_count(si.dwNumberOfProcessors);
3748
3749 MEMORYSTATUSEX ms;
3750 ms.dwLength = sizeof(ms);
3751
3752 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3753 // dwMemoryLoad (% of memory in use)
3754 GlobalMemoryStatusEx(&ms);
3755 _physical_memory = ms.ullTotalPhys;
3756
3757 if (FLAG_IS_DEFAULT(MaxRAM)) {
3758 // Adjust MaxRAM according to the maximum virtual address space available.
3759 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3760 }
3761
3762 OSVERSIONINFOEX oi;
3763 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3764 GetVersionEx((OSVERSIONINFO*)&oi);
3765 switch (oi.dwPlatformId) {
3766 case VER_PLATFORM_WIN32_NT:
3767 {
3768 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3769 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3770 oi.wProductType == VER_NT_SERVER) {
3771 _is_windows_server = true;
3772 }
3773 }
3774 break;
3775 default: fatal("Unknown platform");
3776 }
3777
3778 _default_stack_size = os::current_stack_size();
3779 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3780 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3781 "stack size not a multiple of page size");
3782
3783 initialize_performance_counter();
3784 }
3785
3786
3787 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3788 int ebuflen) {
3789 char path[MAX_PATH];
3790 DWORD size;
3791 DWORD pathLen = (DWORD)sizeof(path);
3792 HINSTANCE result = NULL;
3793
3794 // only allow library name without path component
3795 assert(strchr(name, '\\') == NULL, "path not allowed");
3796 assert(strchr(name, ':') == NULL, "path not allowed");
3797 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3798 jio_snprintf(ebuf, ebuflen,
3799 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3800 return NULL;
3801 }
3802
3803 // search system directory
3804 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3805 if (size >= pathLen) {
3806 return NULL; // truncated
3807 }
3808 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3809 return NULL; // truncated
3810 }
3811 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3812 return result;
3813 }
3814 }
3815
3816 // try Windows directory
3817 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3818 if (size >= pathLen) {
3819 return NULL; // truncated
3820 }
3821 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3822 return NULL; // truncated
3823 }
3824 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3825 return result;
3826 }
3827 }
3828
3829 jio_snprintf(ebuf, ebuflen,
3830 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3831 return NULL;
3832 }
3833
3834 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3835 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3836
3837 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3838 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3839 return TRUE;
3840 }
3841
3842 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3843 // Basic approach:
3844 // - Each exiting thread registers its intent to exit and then does so.
3845 // - A thread trying to terminate the process must wait for all
3846 // threads currently exiting to complete their exit.
3847
3848 if (os::win32::has_exit_bug()) {
3849 // The array holds handles of the threads that have started exiting by calling
3850 // _endthreadex().
3851 // Should be large enough to avoid blocking the exiting thread due to lack of
3852 // a free slot.
3853 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3854 static int handle_count = 0;
3855
3856 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3857 static CRITICAL_SECTION crit_sect;
3858 static volatile DWORD process_exiting = 0;
3859 int i, j;
3860 DWORD res;
3861 HANDLE hproc, hthr;
3862
3863 // We only attempt to register threads until a process exiting
3864 // thread manages to set the process_exiting flag. Any threads
3865 // that come through here after the process_exiting flag is set
3866 // are unregistered and will be caught in the SuspendThread()
3867 // infinite loop below.
3868 bool registered = false;
3869
3870 // The first thread that reached this point, initializes the critical section.
3871 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3872 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3873 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3874 if (what != EPT_THREAD) {
3875 // Atomically set process_exiting before the critical section
3876 // to increase the visibility between racing threads.
3877 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3878 }
3879 EnterCriticalSection(&crit_sect);
3880
3881 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3882 // Remove from the array those handles of the threads that have completed exiting.
3883 for (i = 0, j = 0; i < handle_count; ++i) {
3884 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3885 if (res == WAIT_TIMEOUT) {
3886 handles[j++] = handles[i];
3887 } else {
3888 if (res == WAIT_FAILED) {
3889 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3890 GetLastError(), __FILE__, __LINE__);
3891 }
3892 // Don't keep the handle, if we failed waiting for it.
3893 CloseHandle(handles[i]);
3894 }
3895 }
3896
3897 // If there's no free slot in the array of the kept handles, we'll have to
3898 // wait until at least one thread completes exiting.
3899 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3900 // Raise the priority of the oldest exiting thread to increase its chances
3901 // to complete sooner.
3902 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3903 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3904 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3905 i = (res - WAIT_OBJECT_0);
3906 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3907 for (; i < handle_count; ++i) {
3908 handles[i] = handles[i + 1];
3909 }
3910 } else {
3911 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3912 (res == WAIT_FAILED ? "failed" : "timed out"),
3913 GetLastError(), __FILE__, __LINE__);
3914 // Don't keep handles, if we failed waiting for them.
3915 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3916 CloseHandle(handles[i]);
3917 }
3918 handle_count = 0;
3919 }
3920 }
3921
3922 // Store a duplicate of the current thread handle in the array of handles.
3923 hproc = GetCurrentProcess();
3924 hthr = GetCurrentThread();
3925 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3926 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3927 warning("DuplicateHandle failed (%u) in %s: %d\n",
3928 GetLastError(), __FILE__, __LINE__);
3929
3930 // We can't register this thread (no more handles) so this thread
3931 // may be racing with a thread that is calling exit(). If the thread
3932 // that is calling exit() has managed to set the process_exiting
3933 // flag, then this thread will be caught in the SuspendThread()
3934 // infinite loop below which closes that race. A small timing
3935 // window remains before the process_exiting flag is set, but it
3936 // is only exposed when we are out of handles.
3937 } else {
3938 ++handle_count;
3939 registered = true;
3940
3941 // The current exiting thread has stored its handle in the array, and now
3942 // should leave the critical section before calling _endthreadex().
3943 }
3944
3945 } else if (what != EPT_THREAD && handle_count > 0) {
3946 jlong start_time, finish_time, timeout_left;
3947 // Before ending the process, make sure all the threads that had called
3948 // _endthreadex() completed.
3949
3950 // Set the priority level of the current thread to the same value as
3951 // the priority level of exiting threads.
3952 // This is to ensure it will be given a fair chance to execute if
3953 // the timeout expires.
3954 hthr = GetCurrentThread();
3955 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3956 start_time = os::javaTimeNanos();
3957 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3958 for (i = 0; ; ) {
3959 int portion_count = handle_count - i;
3960 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3961 portion_count = MAXIMUM_WAIT_OBJECTS;
3962 }
3963 for (j = 0; j < portion_count; ++j) {
3964 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3965 }
3966 timeout_left = (finish_time - start_time) / 1000000L;
3967 if (timeout_left < 0) {
3968 timeout_left = 0;
3969 }
3970 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3971 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3972 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3973 (res == WAIT_FAILED ? "failed" : "timed out"),
3974 GetLastError(), __FILE__, __LINE__);
3975 // Reset portion_count so we close the remaining
3976 // handles due to this error.
3977 portion_count = handle_count - i;
3978 }
3979 for (j = 0; j < portion_count; ++j) {
3980 CloseHandle(handles[i + j]);
3981 }
3982 if ((i += portion_count) >= handle_count) {
3983 break;
3984 }
3985 start_time = os::javaTimeNanos();
3986 }
3987 handle_count = 0;
3988 }
3989
3990 LeaveCriticalSection(&crit_sect);
3991 }
3992
3993 if (!registered &&
3994 OrderAccess::load_acquire(&process_exiting) != 0 &&
3995 process_exiting != GetCurrentThreadId()) {
3996 // Some other thread is about to call exit(), so we don't let
3997 // the current unregistered thread proceed to exit() or _endthreadex()
3998 while (true) {
3999 SuspendThread(GetCurrentThread());
4000 // Avoid busy-wait loop, if SuspendThread() failed.
4001 Sleep(EXIT_TIMEOUT);
4002 }
4003 }
4004 }
4005
4006 // We are here if either
4007 // - there's no 'race at exit' bug on this OS release;
4008 // - initialization of the critical section failed (unlikely);
4009 // - the current thread has registered itself and left the critical section;
4010 // - the process-exiting thread has raised the flag and left the critical section.
4011 if (what == EPT_THREAD) {
4012 _endthreadex((unsigned)exit_code);
4013 } else if (what == EPT_PROCESS) {
4014 ::exit(exit_code);
4015 } else {
4016 _exit(exit_code);
4017 }
4018
4019 // Should not reach here
4020 return exit_code;
4021 }
4022
4023 #undef EXIT_TIMEOUT
4024
4025 void os::win32::setmode_streams() {
4026 _setmode(_fileno(stdin), _O_BINARY);
4027 _setmode(_fileno(stdout), _O_BINARY);
4028 _setmode(_fileno(stderr), _O_BINARY);
4029 }
4030
4031
4032 bool os::is_debugger_attached() {
4033 return IsDebuggerPresent() ? true : false;
4034 }
4035
4036
4037 void os::wait_for_keypress_at_exit(void) {
4038 if (PauseAtExit) {
4039 fprintf(stderr, "Press any key to continue...\n");
4040 fgetc(stdin);
4041 }
4042 }
4043
4044
4045 bool os::message_box(const char* title, const char* message) {
4046 int result = MessageBox(NULL, message, title,
4047 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4048 return result == IDYES;
4049 }
4050
4051 #ifndef PRODUCT
4052 #ifndef _WIN64
4053 // Helpers to check whether NX protection is enabled
4054 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4055 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4056 pex->ExceptionRecord->NumberParameters > 0 &&
4057 pex->ExceptionRecord->ExceptionInformation[0] ==
4058 EXCEPTION_INFO_EXEC_VIOLATION) {
4059 return EXCEPTION_EXECUTE_HANDLER;
4060 }
4061 return EXCEPTION_CONTINUE_SEARCH;
4062 }
4063
4064 void nx_check_protection() {
4065 // If NX is enabled we'll get an exception calling into code on the stack
4066 char code[] = { (char)0xC3 }; // ret
4067 void *code_ptr = (void *)code;
4068 __try {
4069 __asm call code_ptr
4070 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4071 tty->print_raw_cr("NX protection detected.");
4072 }
4073 }
4074 #endif // _WIN64
4075 #endif // PRODUCT
4076
4077 // This is called _before_ the global arguments have been parsed
4078 void os::init(void) {
4079 _initial_pid = _getpid();
4080
4081 init_random(1234567);
4082
4083 win32::initialize_system_info();
4084 win32::setmode_streams();
4085 init_page_sizes((size_t) win32::vm_page_size());
4086
4087 // This may be overridden later when argument processing is done.
4088 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false);
4089
4090 // Initialize main_process and main_thread
4091 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4092 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4093 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4094 fatal("DuplicateHandle failed\n");
4095 }
4096 main_thread_id = (int) GetCurrentThreadId();
4097
4098 // initialize fast thread access - only used for 32-bit
4099 win32::initialize_thread_ptr_offset();
4100 }
4101
4102 // To install functions for atexit processing
4103 extern "C" {
4104 static void perfMemory_exit_helper() {
4105 perfMemory_exit();
4106 }
4107 }
4108
4109 static jint initSock();
4110
4111 // this is called _after_ the global arguments have been parsed
4112 jint os::init_2(void) {
4113
4114 // This could be set any time but all platforms
4115 // have to set it the same so we have to mirror Solaris.
4116 DEBUG_ONLY(os::set_mutex_init_done();)
4117
4118 // Setup Windows Exceptions
4119
4120 #if INCLUDE_AOT
4121 // If AOT is enabled we need to install a vectored exception handler
4122 // in order to forward implicit exceptions from code in AOT
4123 // generated DLLs. This is necessary since these DLLs are not
4124 // registered for structured exceptions like codecache methods are.
4125 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) {
4126 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4127 }
4128 #endif
4129
4130 // for debugging float code generation bugs
4131 if (ForceFloatExceptions) {
4132 #ifndef _WIN64
4133 static long fp_control_word = 0;
4134 __asm { fstcw fp_control_word }
4135 // see Intel PPro Manual, Vol. 2, p 7-16
4136 const long precision = 0x20;
4137 const long underflow = 0x10;
4138 const long overflow = 0x08;
4139 const long zero_div = 0x04;
4140 const long denorm = 0x02;
4141 const long invalid = 0x01;
4142 fp_control_word |= invalid;
4143 __asm { fldcw fp_control_word }
4144 #endif
4145 }
4146
4147 // If stack_commit_size is 0, windows will reserve the default size,
4148 // but only commit a small portion of it.
4149 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4150 size_t default_reserve_size = os::win32::default_stack_size();
4151 size_t actual_reserve_size = stack_commit_size;
4152 if (stack_commit_size < default_reserve_size) {
4153 // If stack_commit_size == 0, we want this too
4154 actual_reserve_size = default_reserve_size;
4155 }
4156
4157 // Check minimum allowable stack size for thread creation and to initialize
4158 // the java system classes, including StackOverflowError - depends on page
4159 // size. Add two 4K pages for compiler2 recursion in main thread.
4160 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4161 // class initialization depending on 32 or 64 bit VM.
4162 size_t min_stack_allowed =
4163 (size_t)(JavaThread::stack_guard_zone_size() +
4164 JavaThread::stack_shadow_zone_size() +
4165 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4166
4167 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4168
4169 if (actual_reserve_size < min_stack_allowed) {
4170 tty->print_cr("\nThe Java thread stack size specified is too small. "
4171 "Specify at least %dk",
4172 min_stack_allowed / K);
4173 return JNI_ERR;
4174 }
4175
4176 JavaThread::set_stack_size_at_create(stack_commit_size);
4177
4178 // Calculate theoretical max. size of Threads to guard gainst artifical
4179 // out-of-memory situations, where all available address-space has been
4180 // reserved by thread stacks.
4181 assert(actual_reserve_size != 0, "Must have a stack");
4182
4183 // Calculate the thread limit when we should start doing Virtual Memory
4184 // banging. Currently when the threads will have used all but 200Mb of space.
4185 //
4186 // TODO: consider performing a similar calculation for commit size instead
4187 // as reserve size, since on a 64-bit platform we'll run into that more
4188 // often than running out of virtual memory space. We can use the
4189 // lower value of the two calculations as the os_thread_limit.
4190 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4191 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4192
4193 // at exit methods are called in the reverse order of their registration.
4194 // there is no limit to the number of functions registered. atexit does
4195 // not set errno.
4196
4197 if (PerfAllowAtExitRegistration) {
4198 // only register atexit functions if PerfAllowAtExitRegistration is set.
4199 // atexit functions can be delayed until process exit time, which
4200 // can be problematic for embedded VM situations. Embedded VMs should
4201 // call DestroyJavaVM() to assure that VM resources are released.
4202
4203 // note: perfMemory_exit_helper atexit function may be removed in
4204 // the future if the appropriate cleanup code can be added to the
4205 // VM_Exit VMOperation's doit method.
4206 if (atexit(perfMemory_exit_helper) != 0) {
4207 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4208 }
4209 }
4210
4211 #ifndef _WIN64
4212 // Print something if NX is enabled (win32 on AMD64)
4213 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4214 #endif
4215
4216 // initialize thread priority policy
4217 prio_init();
4218
4219 if (UseNUMA && !ForceNUMA) {
4220 UseNUMA = false; // We don't fully support this yet
4221 }
4222
4223 if (UseNUMAInterleaving) {
4224 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4225 bool success = numa_interleaving_init();
4226 if (!success) UseNUMAInterleaving = false;
4227 }
4228
4229 if (initSock() != JNI_OK) {
4230 return JNI_ERR;
4231 }
4232
4233 SymbolEngine::recalc_search_path();
4234
4235 // Initialize data for jdk.internal.misc.Signal
4236 if (!ReduceSignalUsage) {
4237 jdk_misc_signal_init();
4238 }
4239
4240 return JNI_OK;
4241 }
4242
4243 // Mark the polling page as unreadable
4244 void os::make_polling_page_unreadable(void) {
4245 DWORD old_status;
4246 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4247 PAGE_NOACCESS, &old_status)) {
4248 fatal("Could not disable polling page");
4249 }
4250 }
4251
4252 // Mark the polling page as readable
4253 void os::make_polling_page_readable(void) {
4254 DWORD old_status;
4255 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4256 PAGE_READONLY, &old_status)) {
4257 fatal("Could not enable polling page");
4258 }
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 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c
4287 // Creates an UNC path from a single byte path. Return buffer is
4288 // allocated in C heap and needs to be freed by the caller.
4289 // Returns NULL on error.
4290 static wchar_t* create_unc_path(const char* path, errno_t &err) {
4291 wchar_t* wpath = NULL;
4292 size_t converted_chars = 0;
4293 size_t path_len = strlen(path) + 1; // includes the terminating NULL
4294 if (path[0] == '\\' && path[1] == '\\') {
4295 if (path[2] == '?' && path[3] == '\\'){
4296 // if it already has a \\?\ don't do the prefix
4297 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal);
4298 if (wpath != NULL) {
4299 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len);
4300 } else {
4301 err = ENOMEM;
4302 }
4303 } else {
4304 // only UNC pathname includes double slashes here
4305 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal);
4306 if (wpath != NULL) {
4307 ::wcscpy(wpath, L"\\\\?\\UNC\0");
4308 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len);
4309 } else {
4310 err = ENOMEM;
4311 }
4312 }
4313 } else {
4314 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal);
4315 if (wpath != NULL) {
4316 ::wcscpy(wpath, L"\\\\?\\\0");
4317 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len);
4318 } else {
4319 err = ENOMEM;
4320 }
4321 }
4322 return wpath;
4323 }
4324
4325 static void destroy_unc_path(wchar_t* wpath) {
4326 os::free(wpath);
4327 }
4328
4329 int os::stat(const char *path, struct stat *sbuf) {
4330 char* pathbuf = (char*)os::strdup(path, mtInternal);
4331 if (pathbuf == NULL) {
4332 errno = ENOMEM;
4333 return -1;
4334 }
4335 os::native_path(pathbuf);
4336 int ret;
4337 WIN32_FILE_ATTRIBUTE_DATA file_data;
4338 // Not using stat() to avoid the problem described in JDK-6539723
4339 if (strlen(path) < MAX_PATH) {
4340 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data);
4341 if (!bret) {
4342 errno = ::GetLastError();
4343 ret = -1;
4344 }
4345 else {
4346 file_attribute_data_to_stat(sbuf, file_data);
4347 ret = 0;
4348 }
4349 } else {
4350 errno_t err = ERROR_SUCCESS;
4351 wchar_t* wpath = create_unc_path(pathbuf, err);
4352 if (err != ERROR_SUCCESS) {
4353 if (wpath != NULL) {
4354 destroy_unc_path(wpath);
4355 }
4356 os::free(pathbuf);
4357 errno = err;
4358 return -1;
4359 }
4360 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data);
4361 if (!bret) {
4362 errno = ::GetLastError();
4363 ret = -1;
4364 } else {
4365 file_attribute_data_to_stat(sbuf, file_data);
4366 ret = 0;
4367 }
4368 destroy_unc_path(wpath);
4369 }
4370 os::free(pathbuf);
4371 return ret;
4372 }
4373
4374 static HANDLE create_read_only_file_handle(const char* file) {
4375 if (file == NULL) {
4376 return INVALID_HANDLE_VALUE;
4377 }
4378
4379 char* nativepath = (char*)os::strdup(file, mtInternal);
4380 if (nativepath == NULL) {
4381 errno = ENOMEM;
4382 return INVALID_HANDLE_VALUE;
4383 }
4384 os::native_path(nativepath);
4385
4386 size_t len = strlen(nativepath);
4387 HANDLE handle = INVALID_HANDLE_VALUE;
4388
4389 if (len < MAX_PATH) {
4390 handle = ::CreateFile(nativepath, 0, FILE_SHARE_READ,
4391 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4392 } else {
4393 errno_t err = ERROR_SUCCESS;
4394 wchar_t* wfile = create_unc_path(nativepath, err);
4395 if (err != ERROR_SUCCESS) {
4396 if (wfile != NULL) {
4397 destroy_unc_path(wfile);
4398 }
4399 os::free(nativepath);
4400 return INVALID_HANDLE_VALUE;
4401 }
4402 handle = ::CreateFileW(wfile, 0, FILE_SHARE_READ,
4403 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4404 destroy_unc_path(wfile);
4405 }
4406
4407 os::free(nativepath);
4408 return handle;
4409 }
4410
4411 bool os::same_files(const char* file1, const char* file2) {
4412
4413 if (file1 == NULL && file2 == NULL) {
4414 return true;
4415 }
4416
4417 if (file1 == NULL || file2 == NULL) {
4418 return false;
4419 }
4420
4421 if (strcmp(file1, file2) == 0) {
4422 return true;
4423 }
4424
4425 HANDLE handle1 = create_read_only_file_handle(file1);
4426 HANDLE handle2 = create_read_only_file_handle(file2);
4427 bool result = false;
4428
4429 // if we could open both paths...
4430 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) {
4431 BY_HANDLE_FILE_INFORMATION fileInfo1;
4432 BY_HANDLE_FILE_INFORMATION fileInfo2;
4433 if (::GetFileInformationByHandle(handle1, &fileInfo1) &&
4434 ::GetFileInformationByHandle(handle2, &fileInfo2)) {
4435 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number)
4436 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber &&
4437 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh &&
4438 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) {
4439 result = true;
4440 }
4441 }
4442 }
4443
4444 //free the handles
4445 if (handle1 != INVALID_HANDLE_VALUE) {
4446 ::CloseHandle(handle1);
4447 }
4448
4449 if (handle2 != INVALID_HANDLE_VALUE) {
4450 ::CloseHandle(handle2);
4451 }
4452
4453 return result;
4454 }
4455
4456
4457 #define FT2INT64(ft) \
4458 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4459
4460
4461 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4462 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4463 // of a thread.
4464 //
4465 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4466 // the fast estimate available on the platform.
4467
4468 // current_thread_cpu_time() is not optimized for Windows yet
4469 jlong os::current_thread_cpu_time() {
4470 // return user + sys since the cost is the same
4471 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4472 }
4473
4474 jlong os::thread_cpu_time(Thread* thread) {
4475 // consistent with what current_thread_cpu_time() returns.
4476 return os::thread_cpu_time(thread, true /* user+sys */);
4477 }
4478
4479 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4480 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4481 }
4482
4483 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4484 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4485 // If this function changes, os::is_thread_cpu_time_supported() should too
4486 FILETIME CreationTime;
4487 FILETIME ExitTime;
4488 FILETIME KernelTime;
4489 FILETIME UserTime;
4490
4491 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4492 &ExitTime, &KernelTime, &UserTime) == 0) {
4493 return -1;
4494 } else if (user_sys_cpu_time) {
4495 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4496 } else {
4497 return FT2INT64(UserTime) * 100;
4498 }
4499 }
4500
4501 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4502 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4503 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4504 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4505 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4506 }
4507
4508 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4509 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4510 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4511 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4512 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4513 }
4514
4515 bool os::is_thread_cpu_time_supported() {
4516 // see os::thread_cpu_time
4517 FILETIME CreationTime;
4518 FILETIME ExitTime;
4519 FILETIME KernelTime;
4520 FILETIME UserTime;
4521
4522 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4523 &KernelTime, &UserTime) == 0) {
4524 return false;
4525 } else {
4526 return true;
4527 }
4528 }
4529
4530 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4531 // It does have primitives (PDH API) to get CPU usage and run queue length.
4532 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4533 // If we wanted to implement loadavg on Windows, we have a few options:
4534 //
4535 // a) Query CPU usage and run queue length and "fake" an answer by
4536 // returning the CPU usage if it's under 100%, and the run queue
4537 // length otherwise. It turns out that querying is pretty slow
4538 // on Windows, on the order of 200 microseconds on a fast machine.
4539 // Note that on the Windows the CPU usage value is the % usage
4540 // since the last time the API was called (and the first call
4541 // returns 100%), so we'd have to deal with that as well.
4542 //
4543 // b) Sample the "fake" answer using a sampling thread and store
4544 // the answer in a global variable. The call to loadavg would
4545 // just return the value of the global, avoiding the slow query.
4546 //
4547 // c) Sample a better answer using exponential decay to smooth the
4548 // value. This is basically the algorithm used by UNIX kernels.
4549 //
4550 // Note that sampling thread starvation could affect both (b) and (c).
4551 int os::loadavg(double loadavg[], int nelem) {
4552 return -1;
4553 }
4554
4555
4556 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4557 bool os::dont_yield() {
4558 return DontYieldALot;
4559 }
4560
4561 // This method is a slightly reworked copy of JDK's sysOpen
4562 // from src/windows/hpi/src/sys_api_md.c
4563
4564 int os::open(const char *path, int oflag, int mode) {
4565 char* pathbuf = (char*)os::strdup(path, mtInternal);
4566 if (pathbuf == NULL) {
4567 errno = ENOMEM;
4568 return -1;
4569 }
4570 os::native_path(pathbuf);
4571 int ret;
4572 if (strlen(path) < MAX_PATH) {
4573 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4574 } else {
4575 errno_t err = ERROR_SUCCESS;
4576 wchar_t* wpath = create_unc_path(pathbuf, err);
4577 if (err != ERROR_SUCCESS) {
4578 if (wpath != NULL) {
4579 destroy_unc_path(wpath);
4580 }
4581 os::free(pathbuf);
4582 errno = err;
4583 return -1;
4584 }
4585 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode);
4586 if (ret == -1) {
4587 errno = ::GetLastError();
4588 }
4589 destroy_unc_path(wpath);
4590 }
4591 os::free(pathbuf);
4592 return ret;
4593 }
4594
4595 FILE* os::open(int fd, const char* mode) {
4596 return ::_fdopen(fd, mode);
4597 }
4598
4599 // Is a (classpath) directory empty?
4600 bool os::dir_is_empty(const char* path) {
4601 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
4602 if (search_path == NULL) {
4603 errno = ENOMEM;
4604 return false;
4605 }
4606 strcpy(search_path, path);
4607 os::native_path(search_path);
4608 // Append "*", or possibly "\\*", to path
4609 if (search_path[1] == ':' &&
4610 (search_path[2] == '\0' ||
4611 (search_path[2] == '\\' && search_path[3] == '\0'))) {
4612 // No '\\' needed for cases like "Z:" or "Z:\"
4613 strcat(search_path, "*");
4614 }
4615 else {
4616 strcat(search_path, "\\*");
4617 }
4618 errno_t err = ERROR_SUCCESS;
4619 wchar_t* wpath = create_unc_path(search_path, err);
4620 if (err != ERROR_SUCCESS) {
4621 if (wpath != NULL) {
4622 destroy_unc_path(wpath);
4623 }
4624 os::free(search_path);
4625 errno = err;
4626 return false;
4627 }
4628 WIN32_FIND_DATAW fd;
4629 HANDLE f = ::FindFirstFileW(wpath, &fd);
4630 destroy_unc_path(wpath);
4631 bool is_empty = true;
4632 if (f != INVALID_HANDLE_VALUE) {
4633 while (is_empty && ::FindNextFileW(f, &fd)) {
4634 // An empty directory contains only the current directory file
4635 // and the previous directory file.
4636 if ((wcscmp(fd.cFileName, L".") != 0) &&
4637 (wcscmp(fd.cFileName, L"..") != 0)) {
4638 is_empty = false;
4639 }
4640 }
4641 FindClose(f);
4642 }
4643 os::free(search_path);
4644 return is_empty;
4645 }
4646
4647 // create binary file, rewriting existing file if required
4648 int os::create_binary_file(const char* path, bool rewrite_existing) {
4649 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4650 if (!rewrite_existing) {
4651 oflags |= _O_EXCL;
4652 }
4653 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4654 }
4655
4656 // return current position of file pointer
4657 jlong os::current_file_offset(int fd) {
4658 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4659 }
4660
4661 // move file pointer to the specified offset
4662 jlong os::seek_to_file_offset(int fd, jlong offset) {
4663 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4664 }
4665
4666
4667 jlong os::lseek(int fd, jlong offset, int whence) {
4668 return (jlong) ::_lseeki64(fd, offset, whence);
4669 }
4670
4671 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4672 OVERLAPPED ov;
4673 DWORD nread;
4674 BOOL result;
4675
4676 ZeroMemory(&ov, sizeof(ov));
4677 ov.Offset = (DWORD)offset;
4678 ov.OffsetHigh = (DWORD)(offset >> 32);
4679
4680 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4681
4682 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4683
4684 return result ? nread : 0;
4685 }
4686
4687
4688 // This method is a slightly reworked copy of JDK's sysNativePath
4689 // from src/windows/hpi/src/path_md.c
4690
4691 // Convert a pathname to native format. On win32, this involves forcing all
4692 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4693 // sometimes rejects '/') and removing redundant separators. The input path is
4694 // assumed to have been converted into the character encoding used by the local
4695 // system. Because this might be a double-byte encoding, care is taken to
4696 // treat double-byte lead characters correctly.
4697 //
4698 // This procedure modifies the given path in place, as the result is never
4699 // longer than the original. There is no error return; this operation always
4700 // succeeds.
4701 char * os::native_path(char *path) {
4702 char *src = path, *dst = path, *end = path;
4703 char *colon = NULL; // If a drive specifier is found, this will
4704 // point to the colon following the drive letter
4705
4706 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4707 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4708 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4709
4710 // Check for leading separators
4711 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4712 while (isfilesep(*src)) {
4713 src++;
4714 }
4715
4716 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4717 // Remove leading separators if followed by drive specifier. This
4718 // hack is necessary to support file URLs containing drive
4719 // specifiers (e.g., "file://c:/path"). As a side effect,
4720 // "/c:/path" can be used as an alternative to "c:/path".
4721 *dst++ = *src++;
4722 colon = dst;
4723 *dst++ = ':';
4724 src++;
4725 } else {
4726 src = path;
4727 if (isfilesep(src[0]) && isfilesep(src[1])) {
4728 // UNC pathname: Retain first separator; leave src pointed at
4729 // second separator so that further separators will be collapsed
4730 // into the second separator. The result will be a pathname
4731 // beginning with "\\\\" followed (most likely) by a host name.
4732 src = dst = path + 1;
4733 path[0] = '\\'; // Force first separator to '\\'
4734 }
4735 }
4736
4737 end = dst;
4738
4739 // Remove redundant separators from remainder of path, forcing all
4740 // separators to be '\\' rather than '/'. Also, single byte space
4741 // characters are removed from the end of the path because those
4742 // are not legal ending characters on this operating system.
4743 //
4744 while (*src != '\0') {
4745 if (isfilesep(*src)) {
4746 *dst++ = '\\'; src++;
4747 while (isfilesep(*src)) src++;
4748 if (*src == '\0') {
4749 // Check for trailing separator
4750 end = dst;
4751 if (colon == dst - 2) break; // "z:\\"
4752 if (dst == path + 1) break; // "\\"
4753 if (dst == path + 2 && isfilesep(path[0])) {
4754 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4755 // beginning of a UNC pathname. Even though it is not, by
4756 // itself, a valid UNC pathname, we leave it as is in order
4757 // to be consistent with the path canonicalizer as well
4758 // as the win32 APIs, which treat this case as an invalid
4759 // UNC pathname rather than as an alias for the root
4760 // directory of the current drive.
4761 break;
4762 }
4763 end = --dst; // Path does not denote a root directory, so
4764 // remove trailing separator
4765 break;
4766 }
4767 end = dst;
4768 } else {
4769 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4770 *dst++ = *src++;
4771 if (*src) *dst++ = *src++;
4772 end = dst;
4773 } else { // Copy a single-byte character
4774 char c = *src++;
4775 *dst++ = c;
4776 // Space is not a legal ending character
4777 if (c != ' ') end = dst;
4778 }
4779 }
4780 }
4781
4782 *end = '\0';
4783
4784 // For "z:", add "." to work around a bug in the C runtime library
4785 if (colon == dst - 1) {
4786 path[2] = '.';
4787 path[3] = '\0';
4788 }
4789
4790 return path;
4791 }
4792
4793 // This code is a copy of JDK's sysSetLength
4794 // from src/windows/hpi/src/sys_api_md.c
4795
4796 int os::ftruncate(int fd, jlong length) {
4797 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4798 long high = (long)(length >> 32);
4799 DWORD ret;
4800
4801 if (h == (HANDLE)(-1)) {
4802 return -1;
4803 }
4804
4805 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4806 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4807 return -1;
4808 }
4809
4810 if (::SetEndOfFile(h) == FALSE) {
4811 return -1;
4812 }
4813
4814 return 0;
4815 }
4816
4817 int os::get_fileno(FILE* fp) {
4818 return _fileno(fp);
4819 }
4820
4821 // This code is a copy of JDK's sysSync
4822 // from src/windows/hpi/src/sys_api_md.c
4823 // except for the legacy workaround for a bug in Win 98
4824
4825 int os::fsync(int fd) {
4826 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4827
4828 if ((!::FlushFileBuffers(handle)) &&
4829 (GetLastError() != ERROR_ACCESS_DENIED)) {
4830 // from winerror.h
4831 return -1;
4832 }
4833 return 0;
4834 }
4835
4836 static int nonSeekAvailable(int, long *);
4837 static int stdinAvailable(int, long *);
4838
4839 // This code is a copy of JDK's sysAvailable
4840 // from src/windows/hpi/src/sys_api_md.c
4841
4842 int os::available(int fd, jlong *bytes) {
4843 jlong cur, end;
4844 struct _stati64 stbuf64;
4845
4846 if (::_fstati64(fd, &stbuf64) >= 0) {
4847 int mode = stbuf64.st_mode;
4848 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4849 int ret;
4850 long lpbytes;
4851 if (fd == 0) {
4852 ret = stdinAvailable(fd, &lpbytes);
4853 } else {
4854 ret = nonSeekAvailable(fd, &lpbytes);
4855 }
4856 (*bytes) = (jlong)(lpbytes);
4857 return ret;
4858 }
4859 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4860 return FALSE;
4861 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4862 return FALSE;
4863 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4864 return FALSE;
4865 }
4866 *bytes = end - cur;
4867 return TRUE;
4868 } else {
4869 return FALSE;
4870 }
4871 }
4872
4873 void os::flockfile(FILE* fp) {
4874 _lock_file(fp);
4875 }
4876
4877 void os::funlockfile(FILE* fp) {
4878 _unlock_file(fp);
4879 }
4880
4881 // This code is a copy of JDK's nonSeekAvailable
4882 // from src/windows/hpi/src/sys_api_md.c
4883
4884 static int nonSeekAvailable(int fd, long *pbytes) {
4885 // This is used for available on non-seekable devices
4886 // (like both named and anonymous pipes, such as pipes
4887 // connected to an exec'd process).
4888 // Standard Input is a special case.
4889 HANDLE han;
4890
4891 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4892 return FALSE;
4893 }
4894
4895 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4896 // PeekNamedPipe fails when at EOF. In that case we
4897 // simply make *pbytes = 0 which is consistent with the
4898 // behavior we get on Solaris when an fd is at EOF.
4899 // The only alternative is to raise an Exception,
4900 // which isn't really warranted.
4901 //
4902 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4903 return FALSE;
4904 }
4905 *pbytes = 0;
4906 }
4907 return TRUE;
4908 }
4909
4910 #define MAX_INPUT_EVENTS 2000
4911
4912 // This code is a copy of JDK's stdinAvailable
4913 // from src/windows/hpi/src/sys_api_md.c
4914
4915 static int stdinAvailable(int fd, long *pbytes) {
4916 HANDLE han;
4917 DWORD numEventsRead = 0; // Number of events read from buffer
4918 DWORD numEvents = 0; // Number of events in buffer
4919 DWORD i = 0; // Loop index
4920 DWORD curLength = 0; // Position marker
4921 DWORD actualLength = 0; // Number of bytes readable
4922 BOOL error = FALSE; // Error holder
4923 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4924
4925 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4926 return FALSE;
4927 }
4928
4929 // Construct an array of input records in the console buffer
4930 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4931 if (error == 0) {
4932 return nonSeekAvailable(fd, pbytes);
4933 }
4934
4935 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4936 if (numEvents > MAX_INPUT_EVENTS) {
4937 numEvents = MAX_INPUT_EVENTS;
4938 }
4939
4940 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4941 if (lpBuffer == NULL) {
4942 return FALSE;
4943 }
4944
4945 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4946 if (error == 0) {
4947 os::free(lpBuffer);
4948 return FALSE;
4949 }
4950
4951 // Examine input records for the number of bytes available
4952 for (i=0; i<numEvents; i++) {
4953 if (lpBuffer[i].EventType == KEY_EVENT) {
4954
4955 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4956 &(lpBuffer[i].Event);
4957 if (keyRecord->bKeyDown == TRUE) {
4958 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4959 curLength++;
4960 if (*keyPressed == '\r') {
4961 actualLength = curLength;
4962 }
4963 }
4964 }
4965 }
4966
4967 if (lpBuffer != NULL) {
4968 os::free(lpBuffer);
4969 }
4970
4971 *pbytes = (long) actualLength;
4972 return TRUE;
4973 }
4974
4975 // Map a block of memory.
4976 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4977 char *addr, size_t bytes, bool read_only,
4978 bool allow_exec) {
4979 HANDLE hFile;
4980 char* base;
4981
4982 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4983 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4984 if (hFile == NULL) {
4985 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4986 return NULL;
4987 }
4988
4989 if (allow_exec) {
4990 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4991 // unless it comes from a PE image (which the shared archive is not.)
4992 // Even VirtualProtect refuses to give execute access to mapped memory
4993 // that was not previously executable.
4994 //
4995 // Instead, stick the executable region in anonymous memory. Yuck.
4996 // Penalty is that ~4 pages will not be shareable - in the future
4997 // we might consider DLLizing the shared archive with a proper PE
4998 // header so that mapping executable + sharing is possible.
4999
5000 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
5001 PAGE_READWRITE);
5002 if (base == NULL) {
5003 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
5004 CloseHandle(hFile);
5005 return NULL;
5006 }
5007
5008 // Record virtual memory allocation
5009 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
5010
5011 DWORD bytes_read;
5012 OVERLAPPED overlapped;
5013 overlapped.Offset = (DWORD)file_offset;
5014 overlapped.OffsetHigh = 0;
5015 overlapped.hEvent = NULL;
5016 // ReadFile guarantees that if the return value is true, the requested
5017 // number of bytes were read before returning.
5018 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
5019 if (!res) {
5020 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
5021 release_memory(base, bytes);
5022 CloseHandle(hFile);
5023 return NULL;
5024 }
5025 } else {
5026 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
5027 NULL /* file_name */);
5028 if (hMap == NULL) {
5029 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
5030 CloseHandle(hFile);
5031 return NULL;
5032 }
5033
5034 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
5035 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
5036 (DWORD)bytes, addr);
5037 if (base == NULL) {
5038 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
5039 CloseHandle(hMap);
5040 CloseHandle(hFile);
5041 return NULL;
5042 }
5043
5044 if (CloseHandle(hMap) == 0) {
5045 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
5046 CloseHandle(hFile);
5047 return base;
5048 }
5049 }
5050
5051 if (allow_exec) {
5052 DWORD old_protect;
5053 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
5054 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
5055
5056 if (!res) {
5057 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
5058 // Don't consider this a hard error, on IA32 even if the
5059 // VirtualProtect fails, we should still be able to execute
5060 CloseHandle(hFile);
5061 return base;
5062 }
5063 }
5064
5065 if (CloseHandle(hFile) == 0) {
5066 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
5067 return base;
5068 }
5069
5070 return base;
5071 }
5072
5073
5074 // Remap a block of memory.
5075 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5076 char *addr, size_t bytes, bool read_only,
5077 bool allow_exec) {
5078 // This OS does not allow existing memory maps to be remapped so we
5079 // would have to unmap the memory before we remap it.
5080
5081 // Because there is a small window between unmapping memory and mapping
5082 // it in again with different protections, CDS archives are mapped RW
5083 // on windows, so this function isn't called.
5084 ShouldNotReachHere();
5085 return NULL;
5086 }
5087
5088
5089 // Unmap a block of memory.
5090 // Returns true=success, otherwise false.
5091
5092 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5093 MEMORY_BASIC_INFORMATION mem_info;
5094 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5095 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5096 return false;
5097 }
5098
5099 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5100 // Instead, executable region was allocated using VirtualAlloc(). See
5101 // pd_map_memory() above.
5102 //
5103 // The following flags should match the 'exec_access' flages used for
5104 // VirtualProtect() in pd_map_memory().
5105 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5106 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5107 return pd_release_memory(addr, bytes);
5108 }
5109
5110 BOOL result = UnmapViewOfFile(addr);
5111 if (result == 0) {
5112 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5113 return false;
5114 }
5115 return true;
5116 }
5117
5118 void os::pause() {
5119 char filename[MAX_PATH];
5120 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5121 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5122 } else {
5123 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5124 }
5125
5126 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5127 if (fd != -1) {
5128 struct stat buf;
5129 ::close(fd);
5130 while (::stat(filename, &buf) == 0) {
5131 Sleep(100);
5132 }
5133 } else {
5134 jio_fprintf(stderr,
5135 "Could not open pause file '%s', continuing immediately.\n", filename);
5136 }
5137 }
5138
5139 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5140 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5141 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5142
5143 os::ThreadCrashProtection::ThreadCrashProtection() {
5144 }
5145
5146 // See the caveats for this class in os_windows.hpp
5147 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5148 // into this method and returns false. If no OS EXCEPTION was raised, returns
5149 // true.
5150 // The callback is supposed to provide the method that should be protected.
5151 //
5152 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5153
5154 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5155
5156 _protected_thread = Thread::current_or_null();
5157 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5158
5159 bool success = true;
5160 __try {
5161 _crash_protection = this;
5162 cb.call();
5163 } __except(EXCEPTION_EXECUTE_HANDLER) {
5164 // only for protection, nothing to do
5165 success = false;
5166 }
5167 _crash_protection = NULL;
5168 _protected_thread = NULL;
5169 Thread::muxRelease(&_crash_mux);
5170 return success;
5171 }
5172
5173 // An Event wraps a win32 "CreateEvent" kernel handle.
5174 //
5175 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5176 //
5177 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5178 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5179 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5180 // In addition, an unpark() operation might fetch the handle field, but the
5181 // event could recycle between the fetch and the SetEvent() operation.
5182 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5183 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5184 // on an stale but recycled handle would be harmless, but in practice this might
5185 // confuse other non-Sun code, so it's not a viable approach.
5186 //
5187 // 2: Once a win32 event handle is associated with an Event, it remains associated
5188 // with the Event. The event handle is never closed. This could be construed
5189 // as handle leakage, but only up to the maximum # of threads that have been extant
5190 // at any one time. This shouldn't be an issue, as windows platforms typically
5191 // permit a process to have hundreds of thousands of open handles.
5192 //
5193 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5194 // and release unused handles.
5195 //
5196 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5197 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5198 //
5199 // 5. Use an RCU-like mechanism (Read-Copy Update).
5200 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5201 //
5202 // We use (2).
5203 //
5204 // TODO-FIXME:
5205 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5206 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5207 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5208 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5209 // into a single win32 CreateEvent() handle.
5210 //
5211 // Assumption:
5212 // Only one parker can exist on an event, which is why we allocate
5213 // them per-thread. Multiple unparkers can coexist.
5214 //
5215 // _Event transitions in park()
5216 // -1 => -1 : illegal
5217 // 1 => 0 : pass - return immediately
5218 // 0 => -1 : block; then set _Event to 0 before returning
5219 //
5220 // _Event transitions in unpark()
5221 // 0 => 1 : just return
5222 // 1 => 1 : just return
5223 // -1 => either 0 or 1; must signal target thread
5224 // That is, we can safely transition _Event from -1 to either
5225 // 0 or 1.
5226 //
5227 // _Event serves as a restricted-range semaphore.
5228 // -1 : thread is blocked, i.e. there is a waiter
5229 // 0 : neutral: thread is running or ready,
5230 // could have been signaled after a wait started
5231 // 1 : signaled - thread is running or ready
5232 //
5233 // Another possible encoding of _Event would be with
5234 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5235 //
5236
5237 int os::PlatformEvent::park(jlong Millis) {
5238 // Transitions for _Event:
5239 // -1 => -1 : illegal
5240 // 1 => 0 : pass - return immediately
5241 // 0 => -1 : block; then set _Event to 0 before returning
5242
5243 guarantee(_ParkHandle != NULL , "Invariant");
5244 guarantee(Millis > 0 , "Invariant");
5245
5246 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5247 // the initial park() operation.
5248 // Consider: use atomic decrement instead of CAS-loop
5249
5250 int v;
5251 for (;;) {
5252 v = _Event;
5253 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5254 }
5255 guarantee((v == 0) || (v == 1), "invariant");
5256 if (v != 0) return OS_OK;
5257
5258 // Do this the hard way by blocking ...
5259 // TODO: consider a brief spin here, gated on the success of recent
5260 // spin attempts by this thread.
5261 //
5262 // We decompose long timeouts into series of shorter timed waits.
5263 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5264 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5265 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5266 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5267 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5268 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5269 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5270 // for the already waited time. This policy does not admit any new outcomes.
5271 // In the future, however, we might want to track the accumulated wait time and
5272 // adjust Millis accordingly if we encounter a spurious wakeup.
5273
5274 const int MAXTIMEOUT = 0x10000000;
5275 DWORD rv = WAIT_TIMEOUT;
5276 while (_Event < 0 && Millis > 0) {
5277 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5278 if (Millis > MAXTIMEOUT) {
5279 prd = MAXTIMEOUT;
5280 }
5281 rv = ::WaitForSingleObject(_ParkHandle, prd);
5282 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5283 if (rv == WAIT_TIMEOUT) {
5284 Millis -= prd;
5285 }
5286 }
5287 v = _Event;
5288 _Event = 0;
5289 // see comment at end of os::PlatformEvent::park() below:
5290 OrderAccess::fence();
5291 // If we encounter a nearly simultanous timeout expiry and unpark()
5292 // we return OS_OK indicating we awoke via unpark().
5293 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5294 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5295 }
5296
5297 void os::PlatformEvent::park() {
5298 // Transitions for _Event:
5299 // -1 => -1 : illegal
5300 // 1 => 0 : pass - return immediately
5301 // 0 => -1 : block; then set _Event to 0 before returning
5302
5303 guarantee(_ParkHandle != NULL, "Invariant");
5304 // Invariant: Only the thread associated with the Event/PlatformEvent
5305 // may call park().
5306 // Consider: use atomic decrement instead of CAS-loop
5307 int v;
5308 for (;;) {
5309 v = _Event;
5310 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5311 }
5312 guarantee((v == 0) || (v == 1), "invariant");
5313 if (v != 0) return;
5314
5315 // Do this the hard way by blocking ...
5316 // TODO: consider a brief spin here, gated on the success of recent
5317 // spin attempts by this thread.
5318 while (_Event < 0) {
5319 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5320 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5321 }
5322
5323 // Usually we'll find _Event == 0 at this point, but as
5324 // an optional optimization we clear it, just in case can
5325 // multiple unpark() operations drove _Event up to 1.
5326 _Event = 0;
5327 OrderAccess::fence();
5328 guarantee(_Event >= 0, "invariant");
5329 }
5330
5331 void os::PlatformEvent::unpark() {
5332 guarantee(_ParkHandle != NULL, "Invariant");
5333
5334 // Transitions for _Event:
5335 // 0 => 1 : just return
5336 // 1 => 1 : just return
5337 // -1 => either 0 or 1; must signal target thread
5338 // That is, we can safely transition _Event from -1 to either
5339 // 0 or 1.
5340 // See also: "Semaphores in Plan 9" by Mullender & Cox
5341 //
5342 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5343 // that it will take two back-to-back park() calls for the owning
5344 // thread to block. This has the benefit of forcing a spurious return
5345 // from the first park() call after an unpark() call which will help
5346 // shake out uses of park() and unpark() without condition variables.
5347
5348 if (Atomic::xchg(1, &_Event) >= 0) return;
5349
5350 ::SetEvent(_ParkHandle);
5351 }
5352
5353
5354 // JSR166
5355 // -------------------------------------------------------
5356
5357 // The Windows implementation of Park is very straightforward: Basic
5358 // operations on Win32 Events turn out to have the right semantics to
5359 // use them directly. We opportunistically resuse the event inherited
5360 // from Monitor.
5361
5362 void Parker::park(bool isAbsolute, jlong time) {
5363 guarantee(_ParkEvent != NULL, "invariant");
5364 // First, demultiplex/decode time arguments
5365 if (time < 0) { // don't wait
5366 return;
5367 } else if (time == 0 && !isAbsolute) {
5368 time = INFINITE;
5369 } else if (isAbsolute) {
5370 time -= os::javaTimeMillis(); // convert to relative time
5371 if (time <= 0) { // already elapsed
5372 return;
5373 }
5374 } else { // relative
5375 time /= 1000000; // Must coarsen from nanos to millis
5376 if (time == 0) { // Wait for the minimal time unit if zero
5377 time = 1;
5378 }
5379 }
5380
5381 JavaThread* thread = JavaThread::current();
5382
5383 // Don't wait if interrupted or already triggered
5384 if (Thread::is_interrupted(thread, false) ||
5385 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5386 ResetEvent(_ParkEvent);
5387 return;
5388 } else {
5389 ThreadBlockInVM tbivm(thread);
5390 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5391 thread->set_suspend_equivalent();
5392
5393 WaitForSingleObject(_ParkEvent, time);
5394 ResetEvent(_ParkEvent);
5395
5396 // If externally suspended while waiting, re-suspend
5397 if (thread->handle_special_suspend_equivalent_condition()) {
5398 thread->java_suspend_self();
5399 }
5400 }
5401 }
5402
5403 void Parker::unpark() {
5404 guarantee(_ParkEvent != NULL, "invariant");
5405 SetEvent(_ParkEvent);
5406 }
5407
5408 // Platform Monitor implementation
5409
5410 // Must already be locked
5411 int os::PlatformMonitor::wait(jlong millis) {
5412 assert(millis >= 0, "negative timeout");
5413 int ret = OS_TIMEOUT;
5414 int status = SleepConditionVariableCS(&_cond, &_mutex,
5415 millis == 0 ? INFINITE : millis);
5416 if (status != 0) {
5417 ret = OS_OK;
5418 }
5419 #ifndef PRODUCT
5420 else {
5421 DWORD err = GetLastError();
5422 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5423 }
5424 #endif
5425 return ret;
5426 }
5427
5428 // Run the specified command in a separate process. Return its exit value,
5429 // or -1 on failure (e.g. can't create a new process).
5430 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5431 STARTUPINFO si;
5432 PROCESS_INFORMATION pi;
5433 DWORD exit_code;
5434
5435 char * cmd_string;
5436 const char * cmd_prefix = "cmd /C ";
5437 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5438 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5439 if (cmd_string == NULL) {
5440 return -1;
5441 }
5442 cmd_string[0] = '\0';
5443 strcat(cmd_string, cmd_prefix);
5444 strcat(cmd_string, cmd);
5445
5446 // now replace all '\n' with '&'
5447 char * substring = cmd_string;
5448 while ((substring = strchr(substring, '\n')) != NULL) {
5449 substring[0] = '&';
5450 substring++;
5451 }
5452 memset(&si, 0, sizeof(si));
5453 si.cb = sizeof(si);
5454 memset(&pi, 0, sizeof(pi));
5455 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5456 cmd_string, // command line
5457 NULL, // process security attribute
5458 NULL, // thread security attribute
5459 TRUE, // inherits system handles
5460 0, // no creation flags
5461 NULL, // use parent's environment block
5462 NULL, // use parent's starting directory
5463 &si, // (in) startup information
5464 &pi); // (out) process information
5465
5466 if (rslt) {
5467 // Wait until child process exits.
5468 WaitForSingleObject(pi.hProcess, INFINITE);
5469
5470 GetExitCodeProcess(pi.hProcess, &exit_code);
5471
5472 // Close process and thread handles.
5473 CloseHandle(pi.hProcess);
5474 CloseHandle(pi.hThread);
5475 } else {
5476 exit_code = -1;
5477 }
5478
5479 FREE_C_HEAP_ARRAY(char, cmd_string);
5480 return (int)exit_code;
5481 }
5482
5483 bool os::find(address addr, outputStream* st) {
5484 int offset = -1;
5485 bool result = false;
5486 char buf[256];
5487 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5488 st->print(PTR_FORMAT " ", addr);
5489 if (strlen(buf) < sizeof(buf) - 1) {
5490 char* p = strrchr(buf, '\\');
5491 if (p) {
5492 st->print("%s", p + 1);
5493 } else {
5494 st->print("%s", buf);
5495 }
5496 } else {
5497 // The library name is probably truncated. Let's omit the library name.
5498 // See also JDK-8147512.
5499 }
5500 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5501 st->print("::%s + 0x%x", buf, offset);
5502 }
5503 st->cr();
5504 result = true;
5505 }
5506 return result;
5507 }
5508
5509 static jint initSock() {
5510 WSADATA wsadata;
5511
5512 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5513 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5514 ::GetLastError());
5515 return JNI_ERR;
5516 }
5517 return JNI_OK;
5518 }
5519
5520 struct hostent* os::get_host_by_name(char* name) {
5521 return (struct hostent*)gethostbyname(name);
5522 }
5523
5524 int os::socket_close(int fd) {
5525 return ::closesocket(fd);
5526 }
5527
5528 int os::socket(int domain, int type, int protocol) {
5529 return ::socket(domain, type, protocol);
5530 }
5531
5532 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5533 return ::connect(fd, him, len);
5534 }
5535
5536 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5537 return ::recv(fd, buf, (int)nBytes, flags);
5538 }
5539
5540 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5541 return ::send(fd, buf, (int)nBytes, flags);
5542 }
5543
5544 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5545 return ::send(fd, buf, (int)nBytes, flags);
5546 }
5547
5548 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5549 #if defined(IA32)
5550 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5551 #elif defined (AMD64)
5552 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5553 #endif
5554
5555 // returns true if thread could be suspended,
5556 // false otherwise
5557 static bool do_suspend(HANDLE* h) {
5558 if (h != NULL) {
5559 if (SuspendThread(*h) != ~0) {
5560 return true;
5561 }
5562 }
5563 return false;
5564 }
5565
5566 // resume the thread
5567 // calling resume on an active thread is a no-op
5568 static void do_resume(HANDLE* h) {
5569 if (h != NULL) {
5570 ResumeThread(*h);
5571 }
5572 }
5573
5574 // retrieve a suspend/resume context capable handle
5575 // from the tid. Caller validates handle return value.
5576 void get_thread_handle_for_extended_context(HANDLE* h,
5577 OSThread::thread_id_t tid) {
5578 if (h != NULL) {
5579 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5580 }
5581 }
5582
5583 // Thread sampling implementation
5584 //
5585 void os::SuspendedThreadTask::internal_do_task() {
5586 CONTEXT ctxt;
5587 HANDLE h = NULL;
5588
5589 // get context capable handle for thread
5590 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5591
5592 // sanity
5593 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5594 return;
5595 }
5596
5597 // suspend the thread
5598 if (do_suspend(&h)) {
5599 ctxt.ContextFlags = sampling_context_flags;
5600 // get thread context
5601 GetThreadContext(h, &ctxt);
5602 SuspendedThreadTaskContext context(_thread, &ctxt);
5603 // pass context to Thread Sampling impl
5604 do_task(context);
5605 // resume thread
5606 do_resume(&h);
5607 }
5608
5609 // close handle
5610 CloseHandle(h);
5611 }
5612
5613 bool os::start_debugging(char *buf, int buflen) {
5614 int len = (int)strlen(buf);
5615 char *p = &buf[len];
5616
5617 jio_snprintf(p, buflen-len,
5618 "\n\n"
5619 "Do you want to debug the problem?\n\n"
5620 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5621 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5622 "Otherwise, select 'No' to abort...",
5623 os::current_process_id(), os::current_thread_id());
5624
5625 bool yes = os::message_box("Unexpected Error", buf);
5626
5627 if (yes) {
5628 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5629 // exception. If VM is running inside a debugger, the debugger will
5630 // catch the exception. Otherwise, the breakpoint exception will reach
5631 // the default windows exception handler, which can spawn a debugger and
5632 // automatically attach to the dying VM.
5633 os::breakpoint();
5634 yes = false;
5635 }
5636 return yes;
5637 }
5638
5639 void* os::get_default_process_handle() {
5640 return (void*)GetModuleHandle(NULL);
5641 }
5642
5643 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5644 // which is used to find statically linked in agents.
5645 // Additionally for windows, takes into account __stdcall names.
5646 // Parameters:
5647 // sym_name: Symbol in library we are looking for
5648 // lib_name: Name of library to look in, NULL for shared libs.
5649 // is_absolute_path == true if lib_name is absolute path to agent
5650 // such as "C:/a/b/L.dll"
5651 // == false if only the base name of the library is passed in
5652 // such as "L"
5653 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5654 bool is_absolute_path) {
5655 char *agent_entry_name;
5656 size_t len;
5657 size_t name_len;
5658 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5659 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5660 const char *start;
5661
5662 if (lib_name != NULL) {
5663 len = name_len = strlen(lib_name);
5664 if (is_absolute_path) {
5665 // Need to strip path, prefix and suffix
5666 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5667 lib_name = ++start;
5668 } else {
5669 // Need to check for drive prefix
5670 if ((start = strchr(lib_name, ':')) != NULL) {
5671 lib_name = ++start;
5672 }
5673 }
5674 if (len <= (prefix_len + suffix_len)) {
5675 return NULL;
5676 }
5677 lib_name += prefix_len;
5678 name_len = strlen(lib_name) - suffix_len;
5679 }
5680 }
5681 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5682 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5683 if (agent_entry_name == NULL) {
5684 return NULL;
5685 }
5686 if (lib_name != NULL) {
5687 const char *p = strrchr(sym_name, '@');
5688 if (p != NULL && p != sym_name) {
5689 // sym_name == _Agent_OnLoad@XX
5690 strncpy(agent_entry_name, sym_name, (p - sym_name));
5691 agent_entry_name[(p-sym_name)] = '\0';
5692 // agent_entry_name == _Agent_OnLoad
5693 strcat(agent_entry_name, "_");
5694 strncat(agent_entry_name, lib_name, name_len);
5695 strcat(agent_entry_name, p);
5696 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5697 } else {
5698 strcpy(agent_entry_name, sym_name);
5699 strcat(agent_entry_name, "_");
5700 strncat(agent_entry_name, lib_name, name_len);
5701 }
5702 } else {
5703 strcpy(agent_entry_name, sym_name);
5704 }
5705 return agent_entry_name;
5706 }
5707
5708 #ifndef PRODUCT
5709
5710 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5711 // contiguous memory block at a particular address.
5712 // The test first tries to find a good approximate address to allocate at by using the same
5713 // method to allocate some memory at any address. The test then tries to allocate memory in
5714 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5715 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5716 // the previously allocated memory is available for allocation. The only actual failure
5717 // that is reported is when the test tries to allocate at a particular location but gets a
5718 // different valid one. A NULL return value at this point is not considered an error but may
5719 // be legitimate.
5720 void TestReserveMemorySpecial_test() {
5721 if (!UseLargePages) {
5722 return;
5723 }
5724 // save current value of globals
5725 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5726 bool old_use_numa_interleaving = UseNUMAInterleaving;
5727
5728 // set globals to make sure we hit the correct code path
5729 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5730
5731 // do an allocation at an address selected by the OS to get a good one.
5732 const size_t large_allocation_size = os::large_page_size() * 4;
5733 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5734 if (result == NULL) {
5735 } else {
5736 os::release_memory_special(result, large_allocation_size);
5737
5738 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5739 // we managed to get it once.
5740 const size_t expected_allocation_size = os::large_page_size();
5741 char* expected_location = result + os::large_page_size();
5742 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5743 if (actual_location == NULL) {
5744 } else {
5745 // release memory
5746 os::release_memory_special(actual_location, expected_allocation_size);
5747 // only now check, after releasing any memory to avoid any leaks.
5748 assert(actual_location == expected_location,
5749 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5750 expected_location, expected_allocation_size, actual_location);
5751 }
5752 }
5753
5754 // restore globals
5755 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5756 UseNUMAInterleaving = old_use_numa_interleaving;
5757 }
5758 #endif // PRODUCT
5759
5760 /*
5761 All the defined signal names for Windows.
5762
5763 NOTE that not all of these names are accepted by FindSignal!
5764
5765 For various reasons some of these may be rejected at runtime.
5766
5767 Here are the names currently accepted by a user of sun.misc.Signal with
5768 1.4.1 (ignoring potential interaction with use of chaining, etc):
5769
5770 (LIST TBD)
5771
5772 */
5773 int os::get_signal_number(const char* name) {
5774 static const struct {
5775 const char* name;
5776 int number;
5777 } siglabels [] =
5778 // derived from version 6.0 VC98/include/signal.h
5779 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5780 "FPE", SIGFPE, // floating point exception
5781 "SEGV", SIGSEGV, // segment violation
5782 "INT", SIGINT, // interrupt
5783 "TERM", SIGTERM, // software term signal from kill
5784 "BREAK", SIGBREAK, // Ctrl-Break sequence
5785 "ILL", SIGILL}; // illegal instruction
5786 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5787 if (strcmp(name, siglabels[i].name) == 0) {
5788 return siglabels[i].number;
5789 }
5790 }
5791 return -1;
5792 }
5793
5794 // Fast current thread access
5795
5796 int os::win32::_thread_ptr_offset = 0;
5797
5798 static void call_wrapper_dummy() {}
5799
5800 // We need to call the os_exception_wrapper once so that it sets
5801 // up the offset from FS of the thread pointer.
5802 void os::win32::initialize_thread_ptr_offset() {
5803 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5804 NULL, NULL, NULL, NULL);
5805 }
5806
5807 bool os::supports_map_sync() {
5808 return false;
5809 }