1 /*
2 * Copyright (c) 1997, 2016, 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 "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "logging/log.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
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.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.inline.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 "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.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
77 #ifdef _DEBUG
78 #include <crtdbg.h>
79 #endif
80
81
82 #include <windows.h>
83 #include <sys/types.h>
84 #include <sys/stat.h>
85 #include <sys/timeb.h>
86 #include <objidl.h>
87 #include <shlobj.h>
88
89 #include <malloc.h>
90 #include <signal.h>
91 #include <direct.h>
92 #include <errno.h>
93 #include <fcntl.h>
94 #include <io.h>
95 #include <process.h> // For _beginthreadex(), _endthreadex()
96 #include <imagehlp.h> // For os::dll_address_to_function_name
97 // for enumerating dll libraries
98 #include <vdmdbg.h>
99
100 // for timer info max values which include all bits
101 #define ALL_64_BITS CONST64(-1)
102
103 // For DLL loading/load error detection
104 // Values of PE COFF
105 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
106 #define IMAGE_FILE_SIGNATURE_LENGTH 4
107
108 static HANDLE main_process;
109 static HANDLE main_thread;
110 static int main_thread_id;
111
112 static FILETIME process_creation_time;
113 static FILETIME process_exit_time;
114 static FILETIME process_user_time;
115 static FILETIME process_kernel_time;
116
117 #ifdef _M_IA64
118 #define __CPU__ ia64
119 #else
120 #ifdef _M_AMD64
121 #define __CPU__ amd64
122 #else
123 #define __CPU__ i486
124 #endif
125 #endif
126
127 // save DLL module handle, used by GetModuleFileName
128
129 HINSTANCE vm_lib_handle;
130
131 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
132 switch (reason) {
133 case DLL_PROCESS_ATTACH:
134 vm_lib_handle = hinst;
135 if (ForceTimeHighResolution) {
136 timeBeginPeriod(1L);
137 }
138 break;
139 case DLL_PROCESS_DETACH:
140 if (ForceTimeHighResolution) {
141 timeEndPeriod(1L);
142 }
143 break;
144 default:
145 break;
146 }
147 return true;
148 }
149
150 static inline double fileTimeAsDouble(FILETIME* time) {
151 const double high = (double) ((unsigned int) ~0);
152 const double split = 10000000.0;
153 double result = (time->dwLowDateTime / split) +
154 time->dwHighDateTime * (high/split);
155 return result;
156 }
157
158 // Implementation of os
159
160 bool os::unsetenv(const char* name) {
161 assert(name != NULL, "Null pointer");
162 return (SetEnvironmentVariable(name, NULL) == TRUE);
163 }
164
165 // No setuid programs under Windows.
166 bool os::have_special_privileges() {
167 return false;
168 }
169
170
171 // This method is a periodic task to check for misbehaving JNI applications
172 // under CheckJNI, we can add any periodic checks here.
173 // For Windows at the moment does nothing
174 void os::run_periodic_checks() {
175 return;
176 }
177
178 // previous UnhandledExceptionFilter, if there is one
179 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
180
181 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
182
183 void os::init_system_properties_values() {
184 // sysclasspath, java_home, dll_dir
185 {
186 char *home_path;
187 char *dll_path;
188 char *pslash;
189 char *bin = "\\bin";
190 char home_dir[MAX_PATH + 1];
191 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
192
193 if (alt_home_dir != NULL) {
194 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
195 home_dir[MAX_PATH] = '\0';
196 } else {
197 os::jvm_path(home_dir, sizeof(home_dir));
198 // Found the full path to jvm.dll.
199 // Now cut the path to <java_home>/jre if we can.
200 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
201 pslash = strrchr(home_dir, '\\');
202 if (pslash != NULL) {
203 *pslash = '\0'; // get rid of \{client|server}
204 pslash = strrchr(home_dir, '\\');
205 if (pslash != NULL) {
206 *pslash = '\0'; // get rid of \bin
207 }
208 }
209 }
210
211 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
212 if (home_path == NULL) {
213 return;
214 }
215 strcpy(home_path, home_dir);
216 Arguments::set_java_home(home_path);
217 FREE_C_HEAP_ARRAY(char, home_path);
218
219 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
220 mtInternal);
221 if (dll_path == NULL) {
222 return;
223 }
224 strcpy(dll_path, home_dir);
225 strcat(dll_path, bin);
226 Arguments::set_dll_dir(dll_path);
227 FREE_C_HEAP_ARRAY(char, dll_path);
228
229 if (!set_boot_path('\\', ';')) {
230 return;
231 }
232 }
233
234 // library_path
235 #define EXT_DIR "\\lib\\ext"
236 #define BIN_DIR "\\bin"
237 #define PACKAGE_DIR "\\Sun\\Java"
238 {
239 // Win32 library search order (See the documentation for LoadLibrary):
240 //
241 // 1. The directory from which application is loaded.
242 // 2. The system wide Java Extensions directory (Java only)
243 // 3. System directory (GetSystemDirectory)
244 // 4. Windows directory (GetWindowsDirectory)
245 // 5. The PATH environment variable
246 // 6. The current directory
247
248 char *library_path;
249 char tmp[MAX_PATH];
250 char *path_str = ::getenv("PATH");
251
252 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
253 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
254
255 library_path[0] = '\0';
256
257 GetModuleFileName(NULL, tmp, sizeof(tmp));
258 *(strrchr(tmp, '\\')) = '\0';
259 strcat(library_path, tmp);
260
261 GetWindowsDirectory(tmp, sizeof(tmp));
262 strcat(library_path, ";");
263 strcat(library_path, tmp);
264 strcat(library_path, PACKAGE_DIR BIN_DIR);
265
266 GetSystemDirectory(tmp, sizeof(tmp));
267 strcat(library_path, ";");
268 strcat(library_path, tmp);
269
270 GetWindowsDirectory(tmp, sizeof(tmp));
271 strcat(library_path, ";");
272 strcat(library_path, tmp);
273
274 if (path_str) {
275 strcat(library_path, ";");
276 strcat(library_path, path_str);
277 }
278
279 strcat(library_path, ";.");
280
281 Arguments::set_library_path(library_path);
282 FREE_C_HEAP_ARRAY(char, library_path);
283 }
284
285 // Default extensions directory
286 {
287 char path[MAX_PATH];
288 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
289 GetWindowsDirectory(path, MAX_PATH);
290 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
291 path, PACKAGE_DIR, EXT_DIR);
292 Arguments::set_ext_dirs(buf);
293 }
294 #undef EXT_DIR
295 #undef BIN_DIR
296 #undef PACKAGE_DIR
297
298 #ifndef _WIN64
299 // set our UnhandledExceptionFilter and save any previous one
300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
301 #endif
302
303 // Done
304 return;
305 }
306
307 void os::breakpoint() {
308 DebugBreak();
309 }
310
311 // Invoked from the BREAKPOINT Macro
312 extern "C" void breakpoint() {
313 os::breakpoint();
314 }
315
316 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
317 // So far, this method is only used by Native Memory Tracking, which is
318 // only supported on Windows XP or later.
319 //
320 int os::get_native_stack(address* stack, int frames, int toSkip) {
321 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
322 for (int index = captured; index < frames; index ++) {
323 stack[index] = NULL;
324 }
325 return captured;
326 }
327
328
329 // os::current_stack_base()
330 //
331 // Returns the base of the stack, which is the stack's
332 // starting address. This function must be called
333 // while running on the stack of the thread being queried.
334
335 address os::current_stack_base() {
336 MEMORY_BASIC_INFORMATION minfo;
337 address stack_bottom;
338 size_t stack_size;
339
340 VirtualQuery(&minfo, &minfo, sizeof(minfo));
341 stack_bottom = (address)minfo.AllocationBase;
342 stack_size = minfo.RegionSize;
343
344 // Add up the sizes of all the regions with the same
345 // AllocationBase.
346 while (1) {
347 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
348 if (stack_bottom == (address)minfo.AllocationBase) {
349 stack_size += minfo.RegionSize;
350 } else {
351 break;
352 }
353 }
354
355 #ifdef _M_IA64
356 // IA64 has memory and register stacks
357 //
358 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
359 // at thread creation (1MB backing store growing upwards, 1MB memory stack
360 // growing downwards, 2MB summed up)
361 //
362 // ...
363 // ------- top of stack (high address) -----
364 // |
365 // | 1MB
366 // | Backing Store (Register Stack)
367 // |
368 // | / \
369 // | |
370 // | |
371 // | |
372 // ------------------------ stack base -----
373 // | 1MB
374 // | Memory Stack
375 // |
376 // | |
377 // | |
378 // | |
379 // | \ /
380 // |
381 // ----- bottom of stack (low address) -----
382 // ...
383
384 stack_size = stack_size / 2;
385 #endif
386 return stack_bottom + stack_size;
387 }
388
389 size_t os::current_stack_size() {
390 size_t sz;
391 MEMORY_BASIC_INFORMATION minfo;
392 VirtualQuery(&minfo, &minfo, sizeof(minfo));
393 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
394 return sz;
395 }
396
397 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
398 const struct tm* time_struct_ptr = localtime(clock);
399 if (time_struct_ptr != NULL) {
400 *res = *time_struct_ptr;
401 return res;
402 }
403 return NULL;
404 }
405
406 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
407
408 // Thread start routine for all newly created threads
409 static unsigned __stdcall thread_native_entry(Thread* thread) {
410 // Try to randomize the cache line index of hot stack frames.
411 // This helps when threads of the same stack traces evict each other's
412 // cache lines. The threads can be either from the same JVM instance, or
413 // from different JVM instances. The benefit is especially true for
414 // processors with hyperthreading technology.
415 static int counter = 0;
416 int pid = os::current_process_id();
417 _alloca(((pid ^ counter++) & 7) * 128);
418
419 thread->initialize_thread_current();
420
421 OSThread* osthr = thread->osthread();
422 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
423
424 if (UseNUMA) {
425 int lgrp_id = os::numa_get_group_id();
426 if (lgrp_id != -1) {
427 thread->set_lgrp_id(lgrp_id);
428 }
429 }
430
431 // Diagnostic code to investigate JDK-6573254
432 int res = 30115; // non-java thread
433 if (thread->is_Java_thread()) {
434 res = 20115; // java thread
435 }
436
437 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
438
439 // Install a win32 structured exception handler around every thread created
440 // by VM, so VM can generate error dump when an exception occurred in non-
441 // Java thread (e.g. VM thread).
442 __try {
443 thread->run();
444 } __except(topLevelExceptionFilter(
445 (_EXCEPTION_POINTERS*)_exception_info())) {
446 // Nothing to do.
447 }
448
449 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
450
451 // One less thread is executing
452 // When the VMThread gets here, the main thread may have already exited
453 // which frees the CodeHeap containing the Atomic::add code
454 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
455 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
456 }
457
458 // If a thread has not deleted itself ("delete this") as part of its
459 // termination sequence, we have to ensure thread-local-storage is
460 // cleared before we actually terminate. No threads should ever be
461 // deleted asynchronously with respect to their termination.
462 if (Thread::current_or_null_safe() != NULL) {
463 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
464 thread->clear_thread_current();
465 }
466
467 // Thread must not return from exit_process_or_thread(), but if it does,
468 // let it proceed to exit normally
469 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
470 }
471
472 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
473 int thread_id) {
474 // Allocate the OSThread object
475 OSThread* osthread = new OSThread(NULL, NULL);
476 if (osthread == NULL) return NULL;
477
478 // Initialize support for Java interrupts
479 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
480 if (interrupt_event == NULL) {
481 delete osthread;
482 return NULL;
483 }
484 osthread->set_interrupt_event(interrupt_event);
485
486 // Store info on the Win32 thread into the OSThread
487 osthread->set_thread_handle(thread_handle);
488 osthread->set_thread_id(thread_id);
489
490 if (UseNUMA) {
491 int lgrp_id = os::numa_get_group_id();
492 if (lgrp_id != -1) {
493 thread->set_lgrp_id(lgrp_id);
494 }
495 }
496
497 // Initial thread state is INITIALIZED, not SUSPENDED
498 osthread->set_state(INITIALIZED);
499
500 return osthread;
501 }
502
503
504 bool os::create_attached_thread(JavaThread* thread) {
505 #ifdef ASSERT
506 thread->verify_not_published();
507 #endif
508 HANDLE thread_h;
509 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
510 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
511 fatal("DuplicateHandle failed\n");
512 }
513 OSThread* osthread = create_os_thread(thread, thread_h,
514 (int)current_thread_id());
515 if (osthread == NULL) {
516 return false;
517 }
518
519 // Initial thread state is RUNNABLE
520 osthread->set_state(RUNNABLE);
521
522 thread->set_osthread(osthread);
523
524 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
525 os::current_thread_id());
526
527 return true;
528 }
529
530 bool os::create_main_thread(JavaThread* thread) {
531 #ifdef ASSERT
532 thread->verify_not_published();
533 #endif
534 if (_starting_thread == NULL) {
535 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
536 if (_starting_thread == NULL) {
537 return false;
538 }
539 }
540
541 // The primordial thread is runnable from the start)
542 _starting_thread->set_state(RUNNABLE);
543
544 thread->set_osthread(_starting_thread);
545 return true;
546 }
547
548 // Helper function to trace _beginthreadex attributes,
549 // similar to os::Posix::describe_pthread_attr()
550 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
551 size_t stacksize, unsigned initflag) {
552 stringStream ss(buf, buflen);
553 if (stacksize == 0) {
554 ss.print("stacksize: default, ");
555 } else {
556 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
557 }
558 ss.print("flags: ");
559 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
560 #define ALL(X) \
561 X(CREATE_SUSPENDED) \
562 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
563 ALL(PRINT_FLAG)
564 #undef ALL
565 #undef PRINT_FLAG
566 return buf;
567 }
568
569 // Allocate and initialize a new OSThread
570 bool os::create_thread(Thread* thread, ThreadType thr_type,
571 size_t stack_size) {
572 unsigned thread_id;
573
574 // Allocate the OSThread object
575 OSThread* osthread = new OSThread(NULL, NULL);
576 if (osthread == NULL) {
577 return false;
578 }
579
580 // Initialize support for Java interrupts
581 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
582 if (interrupt_event == NULL) {
583 delete osthread;
584 return NULL;
585 }
586 osthread->set_interrupt_event(interrupt_event);
587 osthread->set_interrupted(false);
588
589 thread->set_osthread(osthread);
590
591 if (stack_size == 0) {
592 switch (thr_type) {
593 case os::java_thread:
594 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
595 if (JavaThread::stack_size_at_create() > 0) {
596 stack_size = JavaThread::stack_size_at_create();
597 }
598 break;
599 case os::compiler_thread:
600 if (CompilerThreadStackSize > 0) {
601 stack_size = (size_t)(CompilerThreadStackSize * K);
602 break;
603 } // else fall through:
604 // use VMThreadStackSize if CompilerThreadStackSize is not defined
605 case os::vm_thread:
606 case os::pgc_thread:
607 case os::cgc_thread:
608 case os::watcher_thread:
609 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
610 break;
611 }
612 }
613
614 // Create the Win32 thread
615 //
616 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
617 // does not specify stack size. Instead, it specifies the size of
618 // initially committed space. The stack size is determined by
619 // PE header in the executable. If the committed "stack_size" is larger
620 // than default value in the PE header, the stack is rounded up to the
621 // nearest multiple of 1MB. For example if the launcher has default
622 // stack size of 320k, specifying any size less than 320k does not
623 // affect the actual stack size at all, it only affects the initial
624 // commitment. On the other hand, specifying 'stack_size' larger than
625 // default value may cause significant increase in memory usage, because
626 // not only the stack space will be rounded up to MB, but also the
627 // entire space is committed upfront.
628 //
629 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
630 // for CreateThread() that can treat 'stack_size' as stack size. However we
631 // are not supposed to call CreateThread() directly according to MSDN
632 // document because JVM uses C runtime library. The good news is that the
633 // flag appears to work with _beginthredex() as well.
634
635 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
636 HANDLE thread_handle =
637 (HANDLE)_beginthreadex(NULL,
638 (unsigned)stack_size,
639 (unsigned (__stdcall *)(void*)) thread_native_entry,
640 thread,
641 initflag,
642 &thread_id);
643
644 char buf[64];
645 if (thread_handle != NULL) {
646 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
647 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
648 } else {
649 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
650 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
651 }
652
653 if (thread_handle == NULL) {
654 // Need to clean up stuff we've allocated so far
655 CloseHandle(osthread->interrupt_event());
656 thread->set_osthread(NULL);
657 delete osthread;
658 return NULL;
659 }
660
661 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
662
663 // Store info on the Win32 thread into the OSThread
664 osthread->set_thread_handle(thread_handle);
665 osthread->set_thread_id(thread_id);
666
667 // Initial thread state is INITIALIZED, not SUSPENDED
668 osthread->set_state(INITIALIZED);
669
670 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
671 return true;
672 }
673
674
675 // Free Win32 resources related to the OSThread
676 void os::free_thread(OSThread* osthread) {
677 assert(osthread != NULL, "osthread not set");
678
679 // We are told to free resources of the argument thread,
680 // but we can only really operate on the current thread.
681 assert(Thread::current()->osthread() == osthread,
682 "os::free_thread but not current thread");
683
684 CloseHandle(osthread->thread_handle());
685 CloseHandle(osthread->interrupt_event());
686 delete osthread;
687 }
688
689 static jlong first_filetime;
690 static jlong initial_performance_count;
691 static jlong performance_frequency;
692
693
694 jlong as_long(LARGE_INTEGER x) {
695 jlong result = 0; // initialization to avoid warning
696 set_high(&result, x.HighPart);
697 set_low(&result, x.LowPart);
698 return result;
699 }
700
701
702 jlong os::elapsed_counter() {
703 LARGE_INTEGER count;
704 QueryPerformanceCounter(&count);
705 return as_long(count) - initial_performance_count;
706 }
707
708
709 jlong os::elapsed_frequency() {
710 return performance_frequency;
711 }
712
713
714 julong os::available_memory() {
715 return win32::available_memory();
716 }
717
718 julong os::win32::available_memory() {
719 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
720 // value if total memory is larger than 4GB
721 MEMORYSTATUSEX ms;
722 ms.dwLength = sizeof(ms);
723 GlobalMemoryStatusEx(&ms);
724
725 return (julong)ms.ullAvailPhys;
726 }
727
728 julong os::physical_memory() {
729 return win32::physical_memory();
730 }
731
732 bool os::has_allocatable_memory_limit(julong* limit) {
733 MEMORYSTATUSEX ms;
734 ms.dwLength = sizeof(ms);
735 GlobalMemoryStatusEx(&ms);
736 #ifdef _LP64
737 *limit = (julong)ms.ullAvailVirtual;
738 return true;
739 #else
740 // Limit to 1400m because of the 2gb address space wall
741 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
742 return true;
743 #endif
744 }
745
746 int os::active_processor_count() {
747 DWORD_PTR lpProcessAffinityMask = 0;
748 DWORD_PTR lpSystemAffinityMask = 0;
749 int proc_count = processor_count();
750 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
751 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
752 // Nof active processors is number of bits in process affinity mask
753 int bitcount = 0;
754 while (lpProcessAffinityMask != 0) {
755 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
756 bitcount++;
757 }
758 return bitcount;
759 } else {
760 return proc_count;
761 }
762 }
763
764 void os::set_native_thread_name(const char *name) {
765
766 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
767 //
768 // Note that unfortunately this only works if the process
769 // is already attached to a debugger; debugger must observe
770 // the exception below to show the correct name.
771
772 const DWORD MS_VC_EXCEPTION = 0x406D1388;
773 struct {
774 DWORD dwType; // must be 0x1000
775 LPCSTR szName; // pointer to name (in user addr space)
776 DWORD dwThreadID; // thread ID (-1=caller thread)
777 DWORD dwFlags; // reserved for future use, must be zero
778 } info;
779
780 info.dwType = 0x1000;
781 info.szName = name;
782 info.dwThreadID = -1;
783 info.dwFlags = 0;
784
785 __try {
786 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
787 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
788 }
789
790 bool os::distribute_processes(uint length, uint* distribution) {
791 // Not yet implemented.
792 return false;
793 }
794
795 bool os::bind_to_processor(uint processor_id) {
796 // Not yet implemented.
797 return false;
798 }
799
800 void os::win32::initialize_performance_counter() {
801 LARGE_INTEGER count;
802 QueryPerformanceFrequency(&count);
803 performance_frequency = as_long(count);
804 QueryPerformanceCounter(&count);
805 initial_performance_count = as_long(count);
806 }
807
808
809 double os::elapsedTime() {
810 return (double) elapsed_counter() / (double) elapsed_frequency();
811 }
812
813
814 // Windows format:
815 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
816 // Java format:
817 // Java standards require the number of milliseconds since 1/1/1970
818
819 // Constant offset - calculated using offset()
820 static jlong _offset = 116444736000000000;
821 // Fake time counter for reproducible results when debugging
822 static jlong fake_time = 0;
823
824 #ifdef ASSERT
825 // Just to be safe, recalculate the offset in debug mode
826 static jlong _calculated_offset = 0;
827 static int _has_calculated_offset = 0;
828
829 jlong offset() {
830 if (_has_calculated_offset) return _calculated_offset;
831 SYSTEMTIME java_origin;
832 java_origin.wYear = 1970;
833 java_origin.wMonth = 1;
834 java_origin.wDayOfWeek = 0; // ignored
835 java_origin.wDay = 1;
836 java_origin.wHour = 0;
837 java_origin.wMinute = 0;
838 java_origin.wSecond = 0;
839 java_origin.wMilliseconds = 0;
840 FILETIME jot;
841 if (!SystemTimeToFileTime(&java_origin, &jot)) {
842 fatal("Error = %d\nWindows error", GetLastError());
843 }
844 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
845 _has_calculated_offset = 1;
846 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
847 return _calculated_offset;
848 }
849 #else
850 jlong offset() {
851 return _offset;
852 }
853 #endif
854
855 jlong windows_to_java_time(FILETIME wt) {
856 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
857 return (a - offset()) / 10000;
858 }
859
860 // Returns time ticks in (10th of micro seconds)
861 jlong windows_to_time_ticks(FILETIME wt) {
862 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
863 return (a - offset());
864 }
865
866 FILETIME java_to_windows_time(jlong l) {
867 jlong a = (l * 10000) + offset();
868 FILETIME result;
869 result.dwHighDateTime = high(a);
870 result.dwLowDateTime = low(a);
871 return result;
872 }
873
874 bool os::supports_vtime() { return true; }
875 bool os::enable_vtime() { return false; }
876 bool os::vtime_enabled() { return false; }
877
878 double os::elapsedVTime() {
879 FILETIME created;
880 FILETIME exited;
881 FILETIME kernel;
882 FILETIME user;
883 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
884 // the resolution of windows_to_java_time() should be sufficient (ms)
885 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
886 } else {
887 return elapsedTime();
888 }
889 }
890
891 jlong os::javaTimeMillis() {
892 if (UseFakeTimers) {
893 return fake_time++;
894 } else {
895 FILETIME wt;
896 GetSystemTimeAsFileTime(&wt);
897 return windows_to_java_time(wt);
898 }
899 }
900
901 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
902 FILETIME wt;
903 GetSystemTimeAsFileTime(&wt);
904 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
905 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
906 seconds = secs;
907 nanos = jlong(ticks - (secs*10000000)) * 100;
908 }
909
910 jlong os::javaTimeNanos() {
911 LARGE_INTEGER current_count;
912 QueryPerformanceCounter(¤t_count);
913 double current = as_long(current_count);
914 double freq = performance_frequency;
915 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
916 return time;
917 }
918
919 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
920 jlong freq = performance_frequency;
921 if (freq < NANOSECS_PER_SEC) {
922 // the performance counter is 64 bits and we will
923 // be multiplying it -- so no wrap in 64 bits
924 info_ptr->max_value = ALL_64_BITS;
925 } else if (freq > NANOSECS_PER_SEC) {
926 // use the max value the counter can reach to
927 // determine the max value which could be returned
928 julong max_counter = (julong)ALL_64_BITS;
929 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
930 } else {
931 // the performance counter is 64 bits and we will
932 // be using it directly -- so no wrap in 64 bits
933 info_ptr->max_value = ALL_64_BITS;
934 }
935
936 // using a counter, so no skipping
937 info_ptr->may_skip_backward = false;
938 info_ptr->may_skip_forward = false;
939
940 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
941 }
942
943 char* os::local_time_string(char *buf, size_t buflen) {
944 SYSTEMTIME st;
945 GetLocalTime(&st);
946 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
947 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
948 return buf;
949 }
950
951 bool os::getTimesSecs(double* process_real_time,
952 double* process_user_time,
953 double* process_system_time) {
954 HANDLE h_process = GetCurrentProcess();
955 FILETIME create_time, exit_time, kernel_time, user_time;
956 BOOL result = GetProcessTimes(h_process,
957 &create_time,
958 &exit_time,
959 &kernel_time,
960 &user_time);
961 if (result != 0) {
962 FILETIME wt;
963 GetSystemTimeAsFileTime(&wt);
964 jlong rtc_millis = windows_to_java_time(wt);
965 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
966 *process_user_time =
967 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
968 *process_system_time =
969 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
970 return true;
971 } else {
972 return false;
973 }
974 }
975
976 void os::shutdown() {
977 // allow PerfMemory to attempt cleanup of any persistent resources
978 perfMemory_exit();
979
980 // flush buffered output, finish log files
981 ostream_abort();
982
983 // Check for abort hook
984 abort_hook_t abort_hook = Arguments::abort_hook();
985 if (abort_hook != NULL) {
986 abort_hook();
987 }
988 }
989
990
991 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
992 PMINIDUMP_EXCEPTION_INFORMATION,
993 PMINIDUMP_USER_STREAM_INFORMATION,
994 PMINIDUMP_CALLBACK_INFORMATION);
995
996 static HANDLE dumpFile = NULL;
997
998 // Check if dump file can be created.
999 void os::check_dump_limit(char* buffer, size_t buffsz) {
1000 bool status = true;
1001 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1002 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1003 status = false;
1004 }
1005
1006 #ifndef ASSERT
1007 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1008 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1009 status = false;
1010 }
1011 #endif
1012
1013 if (status) {
1014 const char* cwd = get_current_directory(NULL, 0);
1015 int pid = current_process_id();
1016 if (cwd != NULL) {
1017 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1018 } else {
1019 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1020 }
1021
1022 if (dumpFile == NULL &&
1023 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1024 == INVALID_HANDLE_VALUE) {
1025 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1026 status = false;
1027 }
1028 }
1029 VMError::record_coredump_status(buffer, status);
1030 }
1031
1032 void os::abort(bool dump_core, void* siginfo, const void* context) {
1033 HINSTANCE dbghelp;
1034 EXCEPTION_POINTERS ep;
1035 MINIDUMP_EXCEPTION_INFORMATION mei;
1036 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1037
1038 HANDLE hProcess = GetCurrentProcess();
1039 DWORD processId = GetCurrentProcessId();
1040 MINIDUMP_TYPE dumpType;
1041
1042 shutdown();
1043 if (!dump_core || dumpFile == NULL) {
1044 if (dumpFile != NULL) {
1045 CloseHandle(dumpFile);
1046 }
1047 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1048 }
1049
1050 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1051
1052 if (dbghelp == NULL) {
1053 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1054 CloseHandle(dumpFile);
1055 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1056 }
1057
1058 _MiniDumpWriteDump =
1059 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1060 PMINIDUMP_EXCEPTION_INFORMATION,
1061 PMINIDUMP_USER_STREAM_INFORMATION,
1062 PMINIDUMP_CALLBACK_INFORMATION),
1063 GetProcAddress(dbghelp,
1064 "MiniDumpWriteDump"));
1065
1066 if (_MiniDumpWriteDump == NULL) {
1067 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1068 CloseHandle(dumpFile);
1069 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1070 }
1071
1072 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1073 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1074
1075 if (siginfo != NULL && context != NULL) {
1076 ep.ContextRecord = (PCONTEXT) context;
1077 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1078
1079 mei.ThreadId = GetCurrentThreadId();
1080 mei.ExceptionPointers = &ep;
1081 pmei = &mei;
1082 } else {
1083 pmei = NULL;
1084 }
1085
1086 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1087 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1088 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1089 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1090 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1091 }
1092 CloseHandle(dumpFile);
1093 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1094 }
1095
1096 // Die immediately, no exit hook, no abort hook, no cleanup.
1097 void os::die() {
1098 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1099 }
1100
1101 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1102 // * dirent_md.c 1.15 00/02/02
1103 //
1104 // The declarations for DIR and struct dirent are in jvm_win32.h.
1105
1106 // Caller must have already run dirname through JVM_NativePath, which removes
1107 // duplicate slashes and converts all instances of '/' into '\\'.
1108
1109 DIR * os::opendir(const char *dirname) {
1110 assert(dirname != NULL, "just checking"); // hotspot change
1111 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1112 DWORD fattr; // hotspot change
1113 char alt_dirname[4] = { 0, 0, 0, 0 };
1114
1115 if (dirp == 0) {
1116 errno = ENOMEM;
1117 return 0;
1118 }
1119
1120 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1121 // as a directory in FindFirstFile(). We detect this case here and
1122 // prepend the current drive name.
1123 //
1124 if (dirname[1] == '\0' && dirname[0] == '\\') {
1125 alt_dirname[0] = _getdrive() + 'A' - 1;
1126 alt_dirname[1] = ':';
1127 alt_dirname[2] = '\\';
1128 alt_dirname[3] = '\0';
1129 dirname = alt_dirname;
1130 }
1131
1132 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1133 if (dirp->path == 0) {
1134 free(dirp);
1135 errno = ENOMEM;
1136 return 0;
1137 }
1138 strcpy(dirp->path, dirname);
1139
1140 fattr = GetFileAttributes(dirp->path);
1141 if (fattr == 0xffffffff) {
1142 free(dirp->path);
1143 free(dirp);
1144 errno = ENOENT;
1145 return 0;
1146 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1147 free(dirp->path);
1148 free(dirp);
1149 errno = ENOTDIR;
1150 return 0;
1151 }
1152
1153 // Append "*.*", or possibly "\\*.*", to path
1154 if (dirp->path[1] == ':' &&
1155 (dirp->path[2] == '\0' ||
1156 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1157 // No '\\' needed for cases like "Z:" or "Z:\"
1158 strcat(dirp->path, "*.*");
1159 } else {
1160 strcat(dirp->path, "\\*.*");
1161 }
1162
1163 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1164 if (dirp->handle == INVALID_HANDLE_VALUE) {
1165 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1166 free(dirp->path);
1167 free(dirp);
1168 errno = EACCES;
1169 return 0;
1170 }
1171 }
1172 return dirp;
1173 }
1174
1175 // parameter dbuf unused on Windows
1176 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1177 assert(dirp != NULL, "just checking"); // hotspot change
1178 if (dirp->handle == INVALID_HANDLE_VALUE) {
1179 return 0;
1180 }
1181
1182 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1183
1184 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1185 if (GetLastError() == ERROR_INVALID_HANDLE) {
1186 errno = EBADF;
1187 return 0;
1188 }
1189 FindClose(dirp->handle);
1190 dirp->handle = INVALID_HANDLE_VALUE;
1191 }
1192
1193 return &dirp->dirent;
1194 }
1195
1196 int os::closedir(DIR *dirp) {
1197 assert(dirp != NULL, "just checking"); // hotspot change
1198 if (dirp->handle != INVALID_HANDLE_VALUE) {
1199 if (!FindClose(dirp->handle)) {
1200 errno = EBADF;
1201 return -1;
1202 }
1203 dirp->handle = INVALID_HANDLE_VALUE;
1204 }
1205 free(dirp->path);
1206 free(dirp);
1207 return 0;
1208 }
1209
1210 // This must be hard coded because it's the system's temporary
1211 // directory not the java application's temp directory, ala java.io.tmpdir.
1212 const char* os::get_temp_directory() {
1213 static char path_buf[MAX_PATH];
1214 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1215 return path_buf;
1216 } else {
1217 path_buf[0] = '\0';
1218 return path_buf;
1219 }
1220 }
1221
1222 static bool file_exists(const char* filename) {
1223 if (filename == NULL || strlen(filename) == 0) {
1224 return false;
1225 }
1226 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1227 }
1228
1229 bool os::dll_build_name(char *buffer, size_t buflen,
1230 const char* pname, const char* fname) {
1231 bool retval = false;
1232 const size_t pnamelen = pname ? strlen(pname) : 0;
1233 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1234
1235 // Return error on buffer overflow.
1236 if (pnamelen + strlen(fname) + 10 > buflen) {
1237 return retval;
1238 }
1239
1240 if (pnamelen == 0) {
1241 jio_snprintf(buffer, buflen, "%s.dll", fname);
1242 retval = true;
1243 } else if (c == ':' || c == '\\') {
1244 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1245 retval = true;
1246 } else if (strchr(pname, *os::path_separator()) != NULL) {
1247 int n;
1248 char** pelements = split_path(pname, &n);
1249 if (pelements == NULL) {
1250 return false;
1251 }
1252 for (int i = 0; i < n; i++) {
1253 char* path = pelements[i];
1254 // Really shouldn't be NULL, but check can't hurt
1255 size_t plen = (path == NULL) ? 0 : strlen(path);
1256 if (plen == 0) {
1257 continue; // skip the empty path values
1258 }
1259 const char lastchar = path[plen - 1];
1260 if (lastchar == ':' || lastchar == '\\') {
1261 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1262 } else {
1263 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1264 }
1265 if (file_exists(buffer)) {
1266 retval = true;
1267 break;
1268 }
1269 }
1270 // release the storage
1271 for (int i = 0; i < n; i++) {
1272 if (pelements[i] != NULL) {
1273 FREE_C_HEAP_ARRAY(char, pelements[i]);
1274 }
1275 }
1276 if (pelements != NULL) {
1277 FREE_C_HEAP_ARRAY(char*, pelements);
1278 }
1279 } else {
1280 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1281 retval = true;
1282 }
1283 return retval;
1284 }
1285
1286 // Needs to be in os specific directory because windows requires another
1287 // header file <direct.h>
1288 const char* os::get_current_directory(char *buf, size_t buflen) {
1289 int n = static_cast<int>(buflen);
1290 if (buflen > INT_MAX) n = INT_MAX;
1291 return _getcwd(buf, n);
1292 }
1293
1294 //-----------------------------------------------------------
1295 // Helper functions for fatal error handler
1296 #ifdef _WIN64
1297 // Helper routine which returns true if address in
1298 // within the NTDLL address space.
1299 //
1300 static bool _addr_in_ntdll(address addr) {
1301 HMODULE hmod;
1302 MODULEINFO minfo;
1303
1304 hmod = GetModuleHandle("NTDLL.DLL");
1305 if (hmod == NULL) return false;
1306 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1307 &minfo, sizeof(MODULEINFO))) {
1308 return false;
1309 }
1310
1311 if ((addr >= minfo.lpBaseOfDll) &&
1312 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1313 return true;
1314 } else {
1315 return false;
1316 }
1317 }
1318 #endif
1319
1320 struct _modinfo {
1321 address addr;
1322 char* full_path; // point to a char buffer
1323 int buflen; // size of the buffer
1324 address base_addr;
1325 };
1326
1327 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1328 address top_address, void * param) {
1329 struct _modinfo *pmod = (struct _modinfo *)param;
1330 if (!pmod) return -1;
1331
1332 if (base_addr <= pmod->addr &&
1333 top_address > pmod->addr) {
1334 // if a buffer is provided, copy path name to the buffer
1335 if (pmod->full_path) {
1336 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1337 }
1338 pmod->base_addr = base_addr;
1339 return 1;
1340 }
1341 return 0;
1342 }
1343
1344 bool os::dll_address_to_library_name(address addr, char* buf,
1345 int buflen, int* offset) {
1346 // buf is not optional, but offset is optional
1347 assert(buf != NULL, "sanity check");
1348
1349 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1350 // return the full path to the DLL file, sometimes it returns path
1351 // to the corresponding PDB file (debug info); sometimes it only
1352 // returns partial path, which makes life painful.
1353
1354 struct _modinfo mi;
1355 mi.addr = addr;
1356 mi.full_path = buf;
1357 mi.buflen = buflen;
1358 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1359 // buf already contains path name
1360 if (offset) *offset = addr - mi.base_addr;
1361 return true;
1362 }
1363
1364 buf[0] = '\0';
1365 if (offset) *offset = -1;
1366 return false;
1367 }
1368
1369 bool os::dll_address_to_function_name(address addr, char *buf,
1370 int buflen, int *offset,
1371 bool demangle) {
1372 // buf is not optional, but offset is optional
1373 assert(buf != NULL, "sanity check");
1374
1375 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1376 return true;
1377 }
1378 if (offset != NULL) *offset = -1;
1379 buf[0] = '\0';
1380 return false;
1381 }
1382
1383 // save the start and end address of jvm.dll into param[0] and param[1]
1384 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1385 address top_address, void * param) {
1386 if (!param) return -1;
1387
1388 if (base_addr <= (address)_locate_jvm_dll &&
1389 top_address > (address)_locate_jvm_dll) {
1390 ((address*)param)[0] = base_addr;
1391 ((address*)param)[1] = top_address;
1392 return 1;
1393 }
1394 return 0;
1395 }
1396
1397 address vm_lib_location[2]; // start and end address of jvm.dll
1398
1399 // check if addr is inside jvm.dll
1400 bool os::address_is_in_vm(address addr) {
1401 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1402 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1403 assert(false, "Can't find jvm module.");
1404 return false;
1405 }
1406 }
1407
1408 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1409 }
1410
1411 // print module info; param is outputStream*
1412 static int _print_module(const char* fname, address base_address,
1413 address top_address, void* param) {
1414 if (!param) return -1;
1415
1416 outputStream* st = (outputStream*)param;
1417
1418 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1419 return 0;
1420 }
1421
1422 // Loads .dll/.so and
1423 // in case of error it checks if .dll/.so was built for the
1424 // same architecture as Hotspot is running on
1425 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1426 void * result = LoadLibrary(name);
1427 if (result != NULL) {
1428 return result;
1429 }
1430
1431 DWORD errcode = GetLastError();
1432 if (errcode == ERROR_MOD_NOT_FOUND) {
1433 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1434 ebuf[ebuflen - 1] = '\0';
1435 return NULL;
1436 }
1437
1438 // Parsing dll below
1439 // If we can read dll-info and find that dll was built
1440 // for an architecture other than Hotspot is running in
1441 // - then print to buffer "DLL was built for a different architecture"
1442 // else call os::lasterror to obtain system error message
1443
1444 // Read system error message into ebuf
1445 // It may or may not be overwritten below (in the for loop and just above)
1446 lasterror(ebuf, (size_t) ebuflen);
1447 ebuf[ebuflen - 1] = '\0';
1448 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1449 if (fd < 0) {
1450 return NULL;
1451 }
1452
1453 uint32_t signature_offset;
1454 uint16_t lib_arch = 0;
1455 bool failed_to_get_lib_arch =
1456 ( // Go to position 3c in the dll
1457 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1458 ||
1459 // Read location of signature
1460 (sizeof(signature_offset) !=
1461 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1462 ||
1463 // Go to COFF File Header in dll
1464 // that is located after "signature" (4 bytes long)
1465 (os::seek_to_file_offset(fd,
1466 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1467 ||
1468 // Read field that contains code of architecture
1469 // that dll was built for
1470 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1471 );
1472
1473 ::close(fd);
1474 if (failed_to_get_lib_arch) {
1475 // file i/o error - report os::lasterror(...) msg
1476 return NULL;
1477 }
1478
1479 typedef struct {
1480 uint16_t arch_code;
1481 char* arch_name;
1482 } arch_t;
1483
1484 static const arch_t arch_array[] = {
1485 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1486 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1487 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1488 };
1489 #if (defined _M_IA64)
1490 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1491 #elif (defined _M_AMD64)
1492 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1493 #elif (defined _M_IX86)
1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1495 #else
1496 #error Method os::dll_load requires that one of following \
1497 is defined :_M_IA64,_M_AMD64 or _M_IX86
1498 #endif
1499
1500
1501 // Obtain a string for printf operation
1502 // lib_arch_str shall contain string what platform this .dll was built for
1503 // running_arch_str shall string contain what platform Hotspot was built for
1504 char *running_arch_str = NULL, *lib_arch_str = NULL;
1505 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1506 if (lib_arch == arch_array[i].arch_code) {
1507 lib_arch_str = arch_array[i].arch_name;
1508 }
1509 if (running_arch == arch_array[i].arch_code) {
1510 running_arch_str = arch_array[i].arch_name;
1511 }
1512 }
1513
1514 assert(running_arch_str,
1515 "Didn't find running architecture code in arch_array");
1516
1517 // If the architecture is right
1518 // but some other error took place - report os::lasterror(...) msg
1519 if (lib_arch == running_arch) {
1520 return NULL;
1521 }
1522
1523 if (lib_arch_str != NULL) {
1524 ::_snprintf(ebuf, ebuflen - 1,
1525 "Can't load %s-bit .dll on a %s-bit platform",
1526 lib_arch_str, running_arch_str);
1527 } else {
1528 // don't know what architecture this dll was build for
1529 ::_snprintf(ebuf, ebuflen - 1,
1530 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1531 lib_arch, running_arch_str);
1532 }
1533
1534 return NULL;
1535 }
1536
1537 void os::print_dll_info(outputStream *st) {
1538 st->print_cr("Dynamic libraries:");
1539 get_loaded_modules_info(_print_module, (void *)st);
1540 }
1541
1542 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1543 HANDLE hProcess;
1544
1545 # define MAX_NUM_MODULES 128
1546 HMODULE modules[MAX_NUM_MODULES];
1547 static char filename[MAX_PATH];
1548 int result = 0;
1549
1550 int pid = os::current_process_id();
1551 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1552 FALSE, pid);
1553 if (hProcess == NULL) return 0;
1554
1555 DWORD size_needed;
1556 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1557 CloseHandle(hProcess);
1558 return 0;
1559 }
1560
1561 // number of modules that are currently loaded
1562 int num_modules = size_needed / sizeof(HMODULE);
1563
1564 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1565 // Get Full pathname:
1566 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1567 filename[0] = '\0';
1568 }
1569
1570 MODULEINFO modinfo;
1571 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1572 modinfo.lpBaseOfDll = NULL;
1573 modinfo.SizeOfImage = 0;
1574 }
1575
1576 // Invoke callback function
1577 result = callback(filename, (address)modinfo.lpBaseOfDll,
1578 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1579 if (result) break;
1580 }
1581
1582 CloseHandle(hProcess);
1583 return result;
1584 }
1585
1586 bool os::get_host_name(char* buf, size_t buflen) {
1587 DWORD size = (DWORD)buflen;
1588 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1589 }
1590
1591 void os::get_summary_os_info(char* buf, size_t buflen) {
1592 stringStream sst(buf, buflen);
1593 os::win32::print_windows_version(&sst);
1594 // chop off newline character
1595 char* nl = strchr(buf, '\n');
1596 if (nl != NULL) *nl = '\0';
1597 }
1598
1599 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1600 int ret = vsnprintf(buf, len, fmt, args);
1601 // Get the correct buffer size if buf is too small
1602 if (ret < 0) {
1603 return _vscprintf(fmt, args);
1604 }
1605 return ret;
1606 }
1607
1608 static inline time_t get_mtime(const char* filename) {
1609 struct stat st;
1610 int ret = os::stat(filename, &st);
1611 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1612 return st.st_mtime;
1613 }
1614
1615 int os::compare_file_modified_times(const char* file1, const char* file2) {
1616 time_t t1 = get_mtime(file1);
1617 time_t t2 = get_mtime(file2);
1618 return t1 - t2;
1619 }
1620
1621 void os::print_os_info_brief(outputStream* st) {
1622 os::print_os_info(st);
1623 }
1624
1625 void os::print_os_info(outputStream* st) {
1626 #ifdef ASSERT
1627 char buffer[1024];
1628 st->print("HostName: ");
1629 if (get_host_name(buffer, sizeof(buffer))) {
1630 st->print("%s ", buffer);
1631 } else {
1632 st->print("N/A ");
1633 }
1634 #endif
1635 st->print("OS:");
1636 os::win32::print_windows_version(st);
1637 }
1638
1639 void os::win32::print_windows_version(outputStream* st) {
1640 OSVERSIONINFOEX osvi;
1641 VS_FIXEDFILEINFO *file_info;
1642 TCHAR kernel32_path[MAX_PATH];
1643 UINT len, ret;
1644
1645 // Use the GetVersionEx information to see if we're on a server or
1646 // workstation edition of Windows. Starting with Windows 8.1 we can't
1647 // trust the OS version information returned by this API.
1648 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1649 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1650 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1651 st->print_cr("Call to GetVersionEx failed");
1652 return;
1653 }
1654 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1655
1656 // Get the full path to \Windows\System32\kernel32.dll and use that for
1657 // determining what version of Windows we're running on.
1658 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1659 ret = GetSystemDirectory(kernel32_path, len);
1660 if (ret == 0 || ret > len) {
1661 st->print_cr("Call to GetSystemDirectory failed");
1662 return;
1663 }
1664 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1665
1666 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1667 if (version_size == 0) {
1668 st->print_cr("Call to GetFileVersionInfoSize failed");
1669 return;
1670 }
1671
1672 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1673 if (version_info == NULL) {
1674 st->print_cr("Failed to allocate version_info");
1675 return;
1676 }
1677
1678 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1679 os::free(version_info);
1680 st->print_cr("Call to GetFileVersionInfo failed");
1681 return;
1682 }
1683
1684 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1685 os::free(version_info);
1686 st->print_cr("Call to VerQueryValue failed");
1687 return;
1688 }
1689
1690 int major_version = HIWORD(file_info->dwProductVersionMS);
1691 int minor_version = LOWORD(file_info->dwProductVersionMS);
1692 int build_number = HIWORD(file_info->dwProductVersionLS);
1693 int build_minor = LOWORD(file_info->dwProductVersionLS);
1694 int os_vers = major_version * 1000 + minor_version;
1695 os::free(version_info);
1696
1697 st->print(" Windows ");
1698 switch (os_vers) {
1699
1700 case 6000:
1701 if (is_workstation) {
1702 st->print("Vista");
1703 } else {
1704 st->print("Server 2008");
1705 }
1706 break;
1707
1708 case 6001:
1709 if (is_workstation) {
1710 st->print("7");
1711 } else {
1712 st->print("Server 2008 R2");
1713 }
1714 break;
1715
1716 case 6002:
1717 if (is_workstation) {
1718 st->print("8");
1719 } else {
1720 st->print("Server 2012");
1721 }
1722 break;
1723
1724 case 6003:
1725 if (is_workstation) {
1726 st->print("8.1");
1727 } else {
1728 st->print("Server 2012 R2");
1729 }
1730 break;
1731
1732 case 10000:
1733 if (is_workstation) {
1734 st->print("10");
1735 } else {
1736 st->print("Server 2016");
1737 }
1738 break;
1739
1740 default:
1741 // Unrecognized windows, print out its major and minor versions
1742 st->print("%d.%d", major_version, minor_version);
1743 break;
1744 }
1745
1746 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1747 // find out whether we are running on 64 bit processor or not
1748 SYSTEM_INFO si;
1749 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1750 GetNativeSystemInfo(&si);
1751 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1752 st->print(" , 64 bit");
1753 }
1754
1755 st->print(" Build %d", build_number);
1756 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1757 st->cr();
1758 }
1759
1760 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1761 // Nothing to do for now.
1762 }
1763
1764 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1765 HKEY key;
1766 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1767 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1768 if (status == ERROR_SUCCESS) {
1769 DWORD size = (DWORD)buflen;
1770 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1771 if (status != ERROR_SUCCESS) {
1772 strncpy(buf, "## __CPU__", buflen);
1773 }
1774 RegCloseKey(key);
1775 } else {
1776 // Put generic cpu info to return
1777 strncpy(buf, "## __CPU__", buflen);
1778 }
1779 }
1780
1781 void os::print_memory_info(outputStream* st) {
1782 st->print("Memory:");
1783 st->print(" %dk page", os::vm_page_size()>>10);
1784
1785 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1786 // value if total memory is larger than 4GB
1787 MEMORYSTATUSEX ms;
1788 ms.dwLength = sizeof(ms);
1789 GlobalMemoryStatusEx(&ms);
1790
1791 st->print(", physical %uk", os::physical_memory() >> 10);
1792 st->print("(%uk free)", os::available_memory() >> 10);
1793
1794 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1795 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1796 st->cr();
1797 }
1798
1799 void os::print_siginfo(outputStream *st, const void* siginfo) {
1800 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1801 st->print("siginfo:");
1802
1803 char tmp[64];
1804 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1805 strcpy(tmp, "EXCEPTION_??");
1806 }
1807 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1808
1809 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1810 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1811 er->NumberParameters >= 2) {
1812 switch (er->ExceptionInformation[0]) {
1813 case 0: st->print(", reading address"); break;
1814 case 1: st->print(", writing address"); break;
1815 case 8: st->print(", data execution prevention violation at address"); break;
1816 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1817 er->ExceptionInformation[0]);
1818 }
1819 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1820 } else {
1821 int num = er->NumberParameters;
1822 if (num > 0) {
1823 st->print(", ExceptionInformation=");
1824 for (int i = 0; i < num; i++) {
1825 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1826 }
1827 }
1828 }
1829 st->cr();
1830 }
1831
1832 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1833 // do nothing
1834 }
1835
1836 static char saved_jvm_path[MAX_PATH] = {0};
1837
1838 // Find the full path to the current module, jvm.dll
1839 void os::jvm_path(char *buf, jint buflen) {
1840 // Error checking.
1841 if (buflen < MAX_PATH) {
1842 assert(false, "must use a large-enough buffer");
1843 buf[0] = '\0';
1844 return;
1845 }
1846 // Lazy resolve the path to current module.
1847 if (saved_jvm_path[0] != 0) {
1848 strcpy(buf, saved_jvm_path);
1849 return;
1850 }
1851
1852 buf[0] = '\0';
1853 if (Arguments::sun_java_launcher_is_altjvm()) {
1854 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1855 // for a JAVA_HOME environment variable and fix up the path so it
1856 // looks like jvm.dll is installed there (append a fake suffix
1857 // hotspot/jvm.dll).
1858 char* java_home_var = ::getenv("JAVA_HOME");
1859 if (java_home_var != NULL && java_home_var[0] != 0 &&
1860 strlen(java_home_var) < (size_t)buflen) {
1861 strncpy(buf, java_home_var, buflen);
1862
1863 // determine if this is a legacy image or modules image
1864 // modules image doesn't have "jre" subdirectory
1865 size_t len = strlen(buf);
1866 char* jrebin_p = buf + len;
1867 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1868 if (0 != _access(buf, 0)) {
1869 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1870 }
1871 len = strlen(buf);
1872 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1873 }
1874 }
1875
1876 if (buf[0] == '\0') {
1877 GetModuleFileName(vm_lib_handle, buf, buflen);
1878 }
1879 strncpy(saved_jvm_path, buf, MAX_PATH);
1880 saved_jvm_path[MAX_PATH - 1] = '\0';
1881 }
1882
1883
1884 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1885 #ifndef _WIN64
1886 st->print("_");
1887 #endif
1888 }
1889
1890
1891 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1892 #ifndef _WIN64
1893 st->print("@%d", args_size * sizeof(int));
1894 #endif
1895 }
1896
1897 // This method is a copy of JDK's sysGetLastErrorString
1898 // from src/windows/hpi/src/system_md.c
1899
1900 size_t os::lasterror(char* buf, size_t len) {
1901 DWORD errval;
1902
1903 if ((errval = GetLastError()) != 0) {
1904 // DOS error
1905 size_t n = (size_t)FormatMessage(
1906 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1907 NULL,
1908 errval,
1909 0,
1910 buf,
1911 (DWORD)len,
1912 NULL);
1913 if (n > 3) {
1914 // Drop final '.', CR, LF
1915 if (buf[n - 1] == '\n') n--;
1916 if (buf[n - 1] == '\r') n--;
1917 if (buf[n - 1] == '.') n--;
1918 buf[n] = '\0';
1919 }
1920 return n;
1921 }
1922
1923 if (errno != 0) {
1924 // C runtime error that has no corresponding DOS error code
1925 const char* s = os::strerror(errno);
1926 size_t n = strlen(s);
1927 if (n >= len) n = len - 1;
1928 strncpy(buf, s, n);
1929 buf[n] = '\0';
1930 return n;
1931 }
1932
1933 return 0;
1934 }
1935
1936 int os::get_last_error() {
1937 DWORD error = GetLastError();
1938 if (error == 0) {
1939 error = errno;
1940 }
1941 return (int)error;
1942 }
1943
1944 WindowsSemaphore::WindowsSemaphore(uint value) {
1945 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1946
1947 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1948 }
1949
1950 WindowsSemaphore::~WindowsSemaphore() {
1951 ::CloseHandle(_semaphore);
1952 }
1953
1954 void WindowsSemaphore::signal(uint count) {
1955 if (count > 0) {
1956 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1957
1958 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1959 }
1960 }
1961
1962 void WindowsSemaphore::wait() {
1963 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1964 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1965 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1966 }
1967
1968 // sun.misc.Signal
1969 // NOTE that this is a workaround for an apparent kernel bug where if
1970 // a signal handler for SIGBREAK is installed then that signal handler
1971 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1972 // See bug 4416763.
1973 static void (*sigbreakHandler)(int) = NULL;
1974
1975 static void UserHandler(int sig, void *siginfo, void *context) {
1976 os::signal_notify(sig);
1977 // We need to reinstate the signal handler each time...
1978 os::signal(sig, (void*)UserHandler);
1979 }
1980
1981 void* os::user_handler() {
1982 return (void*) UserHandler;
1983 }
1984
1985 void* os::signal(int signal_number, void* handler) {
1986 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1987 void (*oldHandler)(int) = sigbreakHandler;
1988 sigbreakHandler = (void (*)(int)) handler;
1989 return (void*) oldHandler;
1990 } else {
1991 return (void*)::signal(signal_number, (void (*)(int))handler);
1992 }
1993 }
1994
1995 void os::signal_raise(int signal_number) {
1996 raise(signal_number);
1997 }
1998
1999 // The Win32 C runtime library maps all console control events other than ^C
2000 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2001 // logoff, and shutdown events. We therefore install our own console handler
2002 // that raises SIGTERM for the latter cases.
2003 //
2004 static BOOL WINAPI consoleHandler(DWORD event) {
2005 switch (event) {
2006 case CTRL_C_EVENT:
2007 if (is_error_reported()) {
2008 // Ctrl-C is pressed during error reporting, likely because the error
2009 // handler fails to abort. Let VM die immediately.
2010 os::die();
2011 }
2012
2013 os::signal_raise(SIGINT);
2014 return TRUE;
2015 break;
2016 case CTRL_BREAK_EVENT:
2017 if (sigbreakHandler != NULL) {
2018 (*sigbreakHandler)(SIGBREAK);
2019 }
2020 return TRUE;
2021 break;
2022 case CTRL_LOGOFF_EVENT: {
2023 // Don't terminate JVM if it is running in a non-interactive session,
2024 // such as a service process.
2025 USEROBJECTFLAGS flags;
2026 HANDLE handle = GetProcessWindowStation();
2027 if (handle != NULL &&
2028 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2029 sizeof(USEROBJECTFLAGS), NULL)) {
2030 // If it is a non-interactive session, let next handler to deal
2031 // with it.
2032 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2033 return FALSE;
2034 }
2035 }
2036 }
2037 case CTRL_CLOSE_EVENT:
2038 case CTRL_SHUTDOWN_EVENT:
2039 os::signal_raise(SIGTERM);
2040 return TRUE;
2041 break;
2042 default:
2043 break;
2044 }
2045 return FALSE;
2046 }
2047
2048 // The following code is moved from os.cpp for making this
2049 // code platform specific, which it is by its very nature.
2050
2051 // Return maximum OS signal used + 1 for internal use only
2052 // Used as exit signal for signal_thread
2053 int os::sigexitnum_pd() {
2054 return NSIG;
2055 }
2056
2057 // a counter for each possible signal value, including signal_thread exit signal
2058 static volatile jint pending_signals[NSIG+1] = { 0 };
2059 static HANDLE sig_sem = NULL;
2060
2061 void os::signal_init_pd() {
2062 // Initialize signal structures
2063 memset((void*)pending_signals, 0, sizeof(pending_signals));
2064
2065 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2066
2067 // Programs embedding the VM do not want it to attempt to receive
2068 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2069 // shutdown hooks mechanism introduced in 1.3. For example, when
2070 // the VM is run as part of a Windows NT service (i.e., a servlet
2071 // engine in a web server), the correct behavior is for any console
2072 // control handler to return FALSE, not TRUE, because the OS's
2073 // "final" handler for such events allows the process to continue if
2074 // it is a service (while terminating it if it is not a service).
2075 // To make this behavior uniform and the mechanism simpler, we
2076 // completely disable the VM's usage of these console events if -Xrs
2077 // (=ReduceSignalUsage) is specified. This means, for example, that
2078 // the CTRL-BREAK thread dump mechanism is also disabled in this
2079 // case. See bugs 4323062, 4345157, and related bugs.
2080
2081 if (!ReduceSignalUsage) {
2082 // Add a CTRL-C handler
2083 SetConsoleCtrlHandler(consoleHandler, TRUE);
2084 }
2085 }
2086
2087 void os::signal_notify(int signal_number) {
2088 BOOL ret;
2089 if (sig_sem != NULL) {
2090 Atomic::inc(&pending_signals[signal_number]);
2091 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2092 assert(ret != 0, "ReleaseSemaphore() failed");
2093 }
2094 }
2095
2096 static int check_pending_signals(bool wait_for_signal) {
2097 DWORD ret;
2098 while (true) {
2099 for (int i = 0; i < NSIG + 1; i++) {
2100 jint n = pending_signals[i];
2101 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2102 return i;
2103 }
2104 }
2105 if (!wait_for_signal) {
2106 return -1;
2107 }
2108
2109 JavaThread *thread = JavaThread::current();
2110
2111 ThreadBlockInVM tbivm(thread);
2112
2113 bool threadIsSuspended;
2114 do {
2115 thread->set_suspend_equivalent();
2116 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2117 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2118 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2119
2120 // were we externally suspended while we were waiting?
2121 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2122 if (threadIsSuspended) {
2123 // The semaphore has been incremented, but while we were waiting
2124 // another thread suspended us. We don't want to continue running
2125 // while suspended because that would surprise the thread that
2126 // suspended us.
2127 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2128 assert(ret != 0, "ReleaseSemaphore() failed");
2129
2130 thread->java_suspend_self();
2131 }
2132 } while (threadIsSuspended);
2133 }
2134 }
2135
2136 int os::signal_lookup() {
2137 return check_pending_signals(false);
2138 }
2139
2140 int os::signal_wait() {
2141 return check_pending_signals(true);
2142 }
2143
2144 // Implicit OS exception handling
2145
2146 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2147 address handler) {
2148 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2149 // Save pc in thread
2150 #ifdef _M_IA64
2151 // Do not blow up if no thread info available.
2152 if (thread) {
2153 // Saving PRECISE pc (with slot information) in thread.
2154 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2155 // Convert precise PC into "Unix" format
2156 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2157 thread->set_saved_exception_pc((address)precise_pc);
2158 }
2159 // Set pc to handler
2160 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2161 // Clear out psr.ri (= Restart Instruction) in order to continue
2162 // at the beginning of the target bundle.
2163 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2164 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2165 #else
2166 #ifdef _M_AMD64
2167 // Do not blow up if no thread info available.
2168 if (thread) {
2169 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2170 }
2171 // Set pc to handler
2172 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2173 #else
2174 // Do not blow up if no thread info available.
2175 if (thread) {
2176 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2177 }
2178 // Set pc to handler
2179 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2180 #endif
2181 #endif
2182
2183 // Continue the execution
2184 return EXCEPTION_CONTINUE_EXECUTION;
2185 }
2186
2187
2188 // Used for PostMortemDump
2189 extern "C" void safepoints();
2190 extern "C" void find(int x);
2191 extern "C" void events();
2192
2193 // According to Windows API documentation, an illegal instruction sequence should generate
2194 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2195 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2196 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2197
2198 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2199
2200 // From "Execution Protection in the Windows Operating System" draft 0.35
2201 // Once a system header becomes available, the "real" define should be
2202 // included or copied here.
2203 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2204
2205 // Handle NAT Bit consumption on IA64.
2206 #ifdef _M_IA64
2207 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2208 #endif
2209
2210 // Windows Vista/2008 heap corruption check
2211 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2212
2213 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2214 // C++ compiler contain this error code. Because this is a compiler-generated
2215 // error, the code is not listed in the Win32 API header files.
2216 // The code is actually a cryptic mnemonic device, with the initial "E"
2217 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2218 // ASCII values of "msc".
2219
2220 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2221
2222 #define def_excpt(val) { #val, (val) }
2223
2224 static const struct { char* name; uint number; } exceptlabels[] = {
2225 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2226 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2227 def_excpt(EXCEPTION_BREAKPOINT),
2228 def_excpt(EXCEPTION_SINGLE_STEP),
2229 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2230 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2231 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2232 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2233 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2234 def_excpt(EXCEPTION_FLT_OVERFLOW),
2235 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2236 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2237 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2238 def_excpt(EXCEPTION_INT_OVERFLOW),
2239 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2240 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2241 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2242 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2243 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2244 def_excpt(EXCEPTION_STACK_OVERFLOW),
2245 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2246 def_excpt(EXCEPTION_GUARD_PAGE),
2247 def_excpt(EXCEPTION_INVALID_HANDLE),
2248 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2249 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2250 #ifdef _M_IA64
2251 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2252 #endif
2253 };
2254
2255 #undef def_excpt
2256
2257 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2258 uint code = static_cast<uint>(exception_code);
2259 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2260 if (exceptlabels[i].number == code) {
2261 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2262 return buf;
2263 }
2264 }
2265
2266 return NULL;
2267 }
2268
2269 //-----------------------------------------------------------------------------
2270 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2271 // handle exception caused by idiv; should only happen for -MinInt/-1
2272 // (division by zero is handled explicitly)
2273 #ifdef _M_IA64
2274 assert(0, "Fix Handle_IDiv_Exception");
2275 #else
2276 #ifdef _M_AMD64
2277 PCONTEXT ctx = exceptionInfo->ContextRecord;
2278 address pc = (address)ctx->Rip;
2279 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2280 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2281 if (pc[0] == 0xF7) {
2282 // set correct result values and continue after idiv instruction
2283 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2284 } else {
2285 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2286 }
2287 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2288 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2289 // idiv opcode (0xF7).
2290 ctx->Rdx = (DWORD)0; // remainder
2291 // Continue the execution
2292 #else
2293 PCONTEXT ctx = exceptionInfo->ContextRecord;
2294 address pc = (address)ctx->Eip;
2295 assert(pc[0] == 0xF7, "not an idiv opcode");
2296 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2297 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2298 // set correct result values and continue after idiv instruction
2299 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2300 ctx->Eax = (DWORD)min_jint; // result
2301 ctx->Edx = (DWORD)0; // remainder
2302 // Continue the execution
2303 #endif
2304 #endif
2305 return EXCEPTION_CONTINUE_EXECUTION;
2306 }
2307
2308 //-----------------------------------------------------------------------------
2309 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2310 PCONTEXT ctx = exceptionInfo->ContextRecord;
2311 #ifndef _WIN64
2312 // handle exception caused by native method modifying control word
2313 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2314
2315 switch (exception_code) {
2316 case EXCEPTION_FLT_DENORMAL_OPERAND:
2317 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2318 case EXCEPTION_FLT_INEXACT_RESULT:
2319 case EXCEPTION_FLT_INVALID_OPERATION:
2320 case EXCEPTION_FLT_OVERFLOW:
2321 case EXCEPTION_FLT_STACK_CHECK:
2322 case EXCEPTION_FLT_UNDERFLOW:
2323 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2324 if (fp_control_word != ctx->FloatSave.ControlWord) {
2325 // Restore FPCW and mask out FLT exceptions
2326 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2327 // Mask out pending FLT exceptions
2328 ctx->FloatSave.StatusWord &= 0xffffff00;
2329 return EXCEPTION_CONTINUE_EXECUTION;
2330 }
2331 }
2332
2333 if (prev_uef_handler != NULL) {
2334 // We didn't handle this exception so pass it to the previous
2335 // UnhandledExceptionFilter.
2336 return (prev_uef_handler)(exceptionInfo);
2337 }
2338 #else // !_WIN64
2339 // On Windows, the mxcsr control bits are non-volatile across calls
2340 // See also CR 6192333
2341 //
2342 jint MxCsr = INITIAL_MXCSR;
2343 // we can't use StubRoutines::addr_mxcsr_std()
2344 // because in Win64 mxcsr is not saved there
2345 if (MxCsr != ctx->MxCsr) {
2346 ctx->MxCsr = MxCsr;
2347 return EXCEPTION_CONTINUE_EXECUTION;
2348 }
2349 #endif // !_WIN64
2350
2351 return EXCEPTION_CONTINUE_SEARCH;
2352 }
2353
2354 static inline void report_error(Thread* t, DWORD exception_code,
2355 address addr, void* siginfo, void* context) {
2356 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2357
2358 // If UseOsErrorReporting, this will return here and save the error file
2359 // somewhere where we can find it in the minidump.
2360 }
2361
2362 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2363 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2364 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2365 address addr = (address) exceptionRecord->ExceptionInformation[1];
2366 if (Interpreter::contains(pc)) {
2367 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2368 if (!fr->is_first_java_frame()) {
2369 assert(fr->safe_for_sender(thread), "Safety check");
2370 *fr = fr->java_sender();
2371 }
2372 } else {
2373 // more complex code with compiled code
2374 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2375 CodeBlob* cb = CodeCache::find_blob(pc);
2376 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2377 // Not sure where the pc points to, fallback to default
2378 // stack overflow handling
2379 return false;
2380 } else {
2381 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2382 // in compiled code, the stack banging is performed just after the return pc
2383 // has been pushed on the stack
2384 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2385 if (!fr->is_java_frame()) {
2386 assert(fr->safe_for_sender(thread), "Safety check");
2387 *fr = fr->java_sender();
2388 }
2389 }
2390 }
2391 assert(fr->is_java_frame(), "Safety check");
2392 return true;
2393 }
2394
2395 //-----------------------------------------------------------------------------
2396 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2397 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2398 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2399 #ifdef _M_IA64
2400 // On Itanium, we need the "precise pc", which has the slot number coded
2401 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2402 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2403 // Convert the pc to "Unix format", which has the slot number coded
2404 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2405 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2406 // information is saved in the Unix format.
2407 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2408 #else
2409 #ifdef _M_AMD64
2410 address pc = (address) exceptionInfo->ContextRecord->Rip;
2411 #else
2412 address pc = (address) exceptionInfo->ContextRecord->Eip;
2413 #endif
2414 #endif
2415 Thread* t = Thread::current_or_null_safe();
2416
2417 // Handle SafeFetch32 and SafeFetchN exceptions.
2418 if (StubRoutines::is_safefetch_fault(pc)) {
2419 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2420 }
2421
2422 #ifndef _WIN64
2423 // Execution protection violation - win32 running on AMD64 only
2424 // Handled first to avoid misdiagnosis as a "normal" access violation;
2425 // This is safe to do because we have a new/unique ExceptionInformation
2426 // code for this condition.
2427 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2428 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2429 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2430 address addr = (address) exceptionRecord->ExceptionInformation[1];
2431
2432 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2433 int page_size = os::vm_page_size();
2434
2435 // Make sure the pc and the faulting address are sane.
2436 //
2437 // If an instruction spans a page boundary, and the page containing
2438 // the beginning of the instruction is executable but the following
2439 // page is not, the pc and the faulting address might be slightly
2440 // different - we still want to unguard the 2nd page in this case.
2441 //
2442 // 15 bytes seems to be a (very) safe value for max instruction size.
2443 bool pc_is_near_addr =
2444 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2445 bool instr_spans_page_boundary =
2446 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2447 (intptr_t) page_size) > 0);
2448
2449 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2450 static volatile address last_addr =
2451 (address) os::non_memory_address_word();
2452
2453 // In conservative mode, don't unguard unless the address is in the VM
2454 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2455 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2456
2457 // Set memory to RWX and retry
2458 address page_start =
2459 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2460 bool res = os::protect_memory((char*) page_start, page_size,
2461 os::MEM_PROT_RWX);
2462
2463 log_debug(os)("Execution protection violation "
2464 "at " INTPTR_FORMAT
2465 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2466 p2i(page_start), (res ? "success" : os::strerror(errno)));
2467
2468 // Set last_addr so if we fault again at the same address, we don't
2469 // end up in an endless loop.
2470 //
2471 // There are two potential complications here. Two threads trapping
2472 // at the same address at the same time could cause one of the
2473 // threads to think it already unguarded, and abort the VM. Likely
2474 // very rare.
2475 //
2476 // The other race involves two threads alternately trapping at
2477 // different addresses and failing to unguard the page, resulting in
2478 // an endless loop. This condition is probably even more unlikely
2479 // than the first.
2480 //
2481 // Although both cases could be avoided by using locks or thread
2482 // local last_addr, these solutions are unnecessary complication:
2483 // this handler is a best-effort safety net, not a complete solution.
2484 // It is disabled by default and should only be used as a workaround
2485 // in case we missed any no-execute-unsafe VM code.
2486
2487 last_addr = addr;
2488
2489 return EXCEPTION_CONTINUE_EXECUTION;
2490 }
2491 }
2492
2493 // Last unguard failed or not unguarding
2494 tty->print_raw_cr("Execution protection violation");
2495 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2496 exceptionInfo->ContextRecord);
2497 return EXCEPTION_CONTINUE_SEARCH;
2498 }
2499 }
2500 #endif // _WIN64
2501
2502 // Check to see if we caught the safepoint code in the
2503 // process of write protecting the memory serialization page.
2504 // It write enables the page immediately after protecting it
2505 // so just return.
2506 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2507 if (t != NULL && t->is_Java_thread()) {
2508 JavaThread* thread = (JavaThread*) t;
2509 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2510 address addr = (address) exceptionRecord->ExceptionInformation[1];
2511 if (os::is_memory_serialize_page(thread, addr)) {
2512 // Block current thread until the memory serialize page permission restored.
2513 os::block_on_serialize_page_trap();
2514 return EXCEPTION_CONTINUE_EXECUTION;
2515 }
2516 }
2517 }
2518
2519 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2520 VM_Version::is_cpuinfo_segv_addr(pc)) {
2521 // Verify that OS save/restore AVX registers.
2522 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2523 }
2524
2525 if (t != NULL && t->is_Java_thread()) {
2526 JavaThread* thread = (JavaThread*) t;
2527 bool in_java = thread->thread_state() == _thread_in_Java;
2528
2529 // Handle potential stack overflows up front.
2530 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2531 #ifdef _M_IA64
2532 // Use guard page for register stack.
2533 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2534 address addr = (address) exceptionRecord->ExceptionInformation[1];
2535 // Check for a register stack overflow on Itanium
2536 if (thread->addr_inside_register_stack_red_zone(addr)) {
2537 // Fatal red zone violation happens if the Java program
2538 // catches a StackOverflow error and does so much processing
2539 // that it runs beyond the unprotected yellow guard zone. As
2540 // a result, we are out of here.
2541 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2542 } else if(thread->addr_inside_register_stack(addr)) {
2543 // Disable the yellow zone which sets the state that
2544 // we've got a stack overflow problem.
2545 if (thread->stack_yellow_reserved_zone_enabled()) {
2546 thread->disable_stack_yellow_reserved_zone();
2547 }
2548 // Give us some room to process the exception.
2549 thread->disable_register_stack_guard();
2550 // Tracing with +Verbose.
2551 if (Verbose) {
2552 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2553 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2554 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2555 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2556 thread->register_stack_base(),
2557 thread->register_stack_base() + thread->stack_size());
2558 }
2559
2560 // Reguard the permanent register stack red zone just to be sure.
2561 // We saw Windows silently disabling this without telling us.
2562 thread->enable_register_stack_red_zone();
2563
2564 return Handle_Exception(exceptionInfo,
2565 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2566 }
2567 #endif
2568 if (thread->stack_guards_enabled()) {
2569 if (in_java) {
2570 frame fr;
2571 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2572 address addr = (address) exceptionRecord->ExceptionInformation[1];
2573 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2574 assert(fr.is_java_frame(), "Must be a Java frame");
2575 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2576 }
2577 }
2578 // Yellow zone violation. The o/s has unprotected the first yellow
2579 // zone page for us. Note: must call disable_stack_yellow_zone to
2580 // update the enabled status, even if the zone contains only one page.
2581 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2582 thread->disable_stack_yellow_reserved_zone();
2583 // If not in java code, return and hope for the best.
2584 return in_java
2585 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2586 : EXCEPTION_CONTINUE_EXECUTION;
2587 } else {
2588 // Fatal red zone violation.
2589 thread->disable_stack_red_zone();
2590 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2591 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2592 exceptionInfo->ContextRecord);
2593 return EXCEPTION_CONTINUE_SEARCH;
2594 }
2595 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2596 // Either stack overflow or null pointer exception.
2597 if (in_java) {
2598 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2599 address addr = (address) exceptionRecord->ExceptionInformation[1];
2600 address stack_end = thread->stack_end();
2601 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2602 // Stack overflow.
2603 assert(!os::uses_stack_guard_pages(),
2604 "should be caught by red zone code above.");
2605 return Handle_Exception(exceptionInfo,
2606 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2607 }
2608 // Check for safepoint polling and implicit null
2609 // We only expect null pointers in the stubs (vtable)
2610 // the rest are checked explicitly now.
2611 CodeBlob* cb = CodeCache::find_blob(pc);
2612 if (cb != NULL) {
2613 if (os::is_poll_address(addr)) {
2614 address stub = SharedRuntime::get_poll_stub(pc);
2615 return Handle_Exception(exceptionInfo, stub);
2616 }
2617 }
2618 {
2619 #ifdef _WIN64
2620 // If it's a legal stack address map the entire region in
2621 //
2622 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2623 address addr = (address) exceptionRecord->ExceptionInformation[1];
2624 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2625 addr = (address)((uintptr_t)addr &
2626 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2627 os::commit_memory((char *)addr, thread->stack_base() - addr,
2628 !ExecMem);
2629 return EXCEPTION_CONTINUE_EXECUTION;
2630 } else
2631 #endif
2632 {
2633 // Null pointer exception.
2634 #ifdef _M_IA64
2635 // Process implicit null checks in compiled code. Note: Implicit null checks
2636 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2637 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2638 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2639 // Handle implicit null check in UEP method entry
2640 if (cb && (cb->is_frame_complete_at(pc) ||
2641 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2642 if (Verbose) {
2643 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2644 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2645 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2646 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2647 *(bundle_start + 1), *bundle_start);
2648 }
2649 return Handle_Exception(exceptionInfo,
2650 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2651 }
2652 }
2653
2654 // Implicit null checks were processed above. Hence, we should not reach
2655 // here in the usual case => die!
2656 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2657 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2658 exceptionInfo->ContextRecord);
2659 return EXCEPTION_CONTINUE_SEARCH;
2660
2661 #else // !IA64
2662
2663 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2664 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2665 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2666 }
2667 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2668 exceptionInfo->ContextRecord);
2669 return EXCEPTION_CONTINUE_SEARCH;
2670 #endif
2671 }
2672 }
2673 }
2674
2675 #ifdef _WIN64
2676 // Special care for fast JNI field accessors.
2677 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2678 // in and the heap gets shrunk before the field access.
2679 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2680 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2681 if (addr != (address)-1) {
2682 return Handle_Exception(exceptionInfo, addr);
2683 }
2684 }
2685 #endif
2686
2687 // Stack overflow or null pointer exception in native code.
2688 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2689 exceptionInfo->ContextRecord);
2690 return EXCEPTION_CONTINUE_SEARCH;
2691 } // /EXCEPTION_ACCESS_VIOLATION
2692 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2693 #if defined _M_IA64
2694 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2695 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2696 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2697
2698 // Compiled method patched to be non entrant? Following conditions must apply:
2699 // 1. must be first instruction in bundle
2700 // 2. must be a break instruction with appropriate code
2701 if ((((uint64_t) pc & 0x0F) == 0) &&
2702 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2703 return Handle_Exception(exceptionInfo,
2704 (address)SharedRuntime::get_handle_wrong_method_stub());
2705 }
2706 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2707 #endif
2708
2709
2710 if (in_java) {
2711 switch (exception_code) {
2712 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2713 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2714
2715 case EXCEPTION_INT_OVERFLOW:
2716 return Handle_IDiv_Exception(exceptionInfo);
2717
2718 } // switch
2719 }
2720 if (((thread->thread_state() == _thread_in_Java) ||
2721 (thread->thread_state() == _thread_in_native)) &&
2722 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2723 LONG result=Handle_FLT_Exception(exceptionInfo);
2724 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2725 }
2726 }
2727
2728 if (exception_code != EXCEPTION_BREAKPOINT) {
2729 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2730 exceptionInfo->ContextRecord);
2731 }
2732 return EXCEPTION_CONTINUE_SEARCH;
2733 }
2734
2735 #ifndef _WIN64
2736 // Special care for fast JNI accessors.
2737 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2738 // the heap gets shrunk before the field access.
2739 // Need to install our own structured exception handler since native code may
2740 // install its own.
2741 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2742 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2743 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2744 address pc = (address) exceptionInfo->ContextRecord->Eip;
2745 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2746 if (addr != (address)-1) {
2747 return Handle_Exception(exceptionInfo, addr);
2748 }
2749 }
2750 return EXCEPTION_CONTINUE_SEARCH;
2751 }
2752
2753 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2754 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2755 jobject obj, \
2756 jfieldID fieldID) { \
2757 __try { \
2758 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2759 obj, \
2760 fieldID); \
2761 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2762 _exception_info())) { \
2763 } \
2764 return 0; \
2765 }
2766
2767 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2768 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2769 DEFINE_FAST_GETFIELD(jchar, char, Char)
2770 DEFINE_FAST_GETFIELD(jshort, short, Short)
2771 DEFINE_FAST_GETFIELD(jint, int, Int)
2772 DEFINE_FAST_GETFIELD(jlong, long, Long)
2773 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2774 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2775
2776 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2777 switch (type) {
2778 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2779 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2780 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2781 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2782 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2783 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2784 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2785 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2786 default: ShouldNotReachHere();
2787 }
2788 return (address)-1;
2789 }
2790 #endif
2791
2792 // Virtual Memory
2793
2794 int os::vm_page_size() { return os::win32::vm_page_size(); }
2795 int os::vm_allocation_granularity() {
2796 return os::win32::vm_allocation_granularity();
2797 }
2798
2799 // Windows large page support is available on Windows 2003. In order to use
2800 // large page memory, the administrator must first assign additional privilege
2801 // to the user:
2802 // + select Control Panel -> Administrative Tools -> Local Security Policy
2803 // + select Local Policies -> User Rights Assignment
2804 // + double click "Lock pages in memory", add users and/or groups
2805 // + reboot
2806 // Note the above steps are needed for administrator as well, as administrators
2807 // by default do not have the privilege to lock pages in memory.
2808 //
2809 // Note about Windows 2003: although the API supports committing large page
2810 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2811 // scenario, I found through experiment it only uses large page if the entire
2812 // memory region is reserved and committed in a single VirtualAlloc() call.
2813 // This makes Windows large page support more or less like Solaris ISM, in
2814 // that the entire heap must be committed upfront. This probably will change
2815 // in the future, if so the code below needs to be revisited.
2816
2817 #ifndef MEM_LARGE_PAGES
2818 #define MEM_LARGE_PAGES 0x20000000
2819 #endif
2820
2821 static HANDLE _hProcess;
2822 static HANDLE _hToken;
2823
2824 // Container for NUMA node list info
2825 class NUMANodeListHolder {
2826 private:
2827 int *_numa_used_node_list; // allocated below
2828 int _numa_used_node_count;
2829
2830 void free_node_list() {
2831 if (_numa_used_node_list != NULL) {
2832 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2833 }
2834 }
2835
2836 public:
2837 NUMANodeListHolder() {
2838 _numa_used_node_count = 0;
2839 _numa_used_node_list = NULL;
2840 // do rest of initialization in build routine (after function pointers are set up)
2841 }
2842
2843 ~NUMANodeListHolder() {
2844 free_node_list();
2845 }
2846
2847 bool build() {
2848 DWORD_PTR proc_aff_mask;
2849 DWORD_PTR sys_aff_mask;
2850 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2851 ULONG highest_node_number;
2852 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2853 free_node_list();
2854 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2855 for (unsigned int i = 0; i <= highest_node_number; i++) {
2856 ULONGLONG proc_mask_numa_node;
2857 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2858 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2859 _numa_used_node_list[_numa_used_node_count++] = i;
2860 }
2861 }
2862 return (_numa_used_node_count > 1);
2863 }
2864
2865 int get_count() { return _numa_used_node_count; }
2866 int get_node_list_entry(int n) {
2867 // for indexes out of range, returns -1
2868 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2869 }
2870
2871 } numa_node_list_holder;
2872
2873
2874
2875 static size_t _large_page_size = 0;
2876
2877 static bool request_lock_memory_privilege() {
2878 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2879 os::current_process_id());
2880
2881 LUID luid;
2882 if (_hProcess != NULL &&
2883 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2884 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2885
2886 TOKEN_PRIVILEGES tp;
2887 tp.PrivilegeCount = 1;
2888 tp.Privileges[0].Luid = luid;
2889 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2890
2891 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2892 // privilege. Check GetLastError() too. See MSDN document.
2893 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2894 (GetLastError() == ERROR_SUCCESS)) {
2895 return true;
2896 }
2897 }
2898
2899 return false;
2900 }
2901
2902 static void cleanup_after_large_page_init() {
2903 if (_hProcess) CloseHandle(_hProcess);
2904 _hProcess = NULL;
2905 if (_hToken) CloseHandle(_hToken);
2906 _hToken = NULL;
2907 }
2908
2909 static bool numa_interleaving_init() {
2910 bool success = false;
2911 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2912
2913 // print a warning if UseNUMAInterleaving flag is specified on command line
2914 bool warn_on_failure = use_numa_interleaving_specified;
2915 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2916
2917 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2918 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2919 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2920
2921 if (numa_node_list_holder.build()) {
2922 if (log_is_enabled(Debug, os, cpu)) {
2923 Log(os, cpu) log;
2924 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2925 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2926 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2927 }
2928 }
2929 success = true;
2930 } else {
2931 WARN("Process does not cover multiple NUMA nodes.");
2932 }
2933 if (!success) {
2934 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2935 }
2936 return success;
2937 #undef WARN
2938 }
2939
2940 // this routine is used whenever we need to reserve a contiguous VA range
2941 // but we need to make separate VirtualAlloc calls for each piece of the range
2942 // Reasons for doing this:
2943 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2944 // * UseNUMAInterleaving requires a separate node for each piece
2945 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2946 DWORD prot,
2947 bool should_inject_error = false) {
2948 char * p_buf;
2949 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2950 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2951 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2952
2953 // first reserve enough address space in advance since we want to be
2954 // able to break a single contiguous virtual address range into multiple
2955 // large page commits but WS2003 does not allow reserving large page space
2956 // so we just use 4K pages for reserve, this gives us a legal contiguous
2957 // address space. then we will deallocate that reservation, and re alloc
2958 // using large pages
2959 const size_t size_of_reserve = bytes + chunk_size;
2960 if (bytes > size_of_reserve) {
2961 // Overflowed.
2962 return NULL;
2963 }
2964 p_buf = (char *) VirtualAlloc(addr,
2965 size_of_reserve, // size of Reserve
2966 MEM_RESERVE,
2967 PAGE_READWRITE);
2968 // If reservation failed, return NULL
2969 if (p_buf == NULL) return NULL;
2970 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2971 os::release_memory(p_buf, bytes + chunk_size);
2972
2973 // we still need to round up to a page boundary (in case we are using large pages)
2974 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2975 // instead we handle this in the bytes_to_rq computation below
2976 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2977
2978 // now go through and allocate one chunk at a time until all bytes are
2979 // allocated
2980 size_t bytes_remaining = bytes;
2981 // An overflow of align_size_up() would have been caught above
2982 // in the calculation of size_of_reserve.
2983 char * next_alloc_addr = p_buf;
2984 HANDLE hProc = GetCurrentProcess();
2985
2986 #ifdef ASSERT
2987 // Variable for the failure injection
2988 long ran_num = os::random();
2989 size_t fail_after = ran_num % bytes;
2990 #endif
2991
2992 int count=0;
2993 while (bytes_remaining) {
2994 // select bytes_to_rq to get to the next chunk_size boundary
2995
2996 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2997 // Note allocate and commit
2998 char * p_new;
2999
3000 #ifdef ASSERT
3001 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3002 #else
3003 const bool inject_error_now = false;
3004 #endif
3005
3006 if (inject_error_now) {
3007 p_new = NULL;
3008 } else {
3009 if (!UseNUMAInterleaving) {
3010 p_new = (char *) VirtualAlloc(next_alloc_addr,
3011 bytes_to_rq,
3012 flags,
3013 prot);
3014 } else {
3015 // get the next node to use from the used_node_list
3016 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3017 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3018 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3019 }
3020 }
3021
3022 if (p_new == NULL) {
3023 // Free any allocated pages
3024 if (next_alloc_addr > p_buf) {
3025 // Some memory was committed so release it.
3026 size_t bytes_to_release = bytes - bytes_remaining;
3027 // NMT has yet to record any individual blocks, so it
3028 // need to create a dummy 'reserve' record to match
3029 // the release.
3030 MemTracker::record_virtual_memory_reserve((address)p_buf,
3031 bytes_to_release, CALLER_PC);
3032 os::release_memory(p_buf, bytes_to_release);
3033 }
3034 #ifdef ASSERT
3035 if (should_inject_error) {
3036 log_develop_debug(pagesize)("Reserving pages individually failed.");
3037 }
3038 #endif
3039 return NULL;
3040 }
3041
3042 bytes_remaining -= bytes_to_rq;
3043 next_alloc_addr += bytes_to_rq;
3044 count++;
3045 }
3046 // Although the memory is allocated individually, it is returned as one.
3047 // NMT records it as one block.
3048 if ((flags & MEM_COMMIT) != 0) {
3049 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3050 } else {
3051 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3052 }
3053
3054 // made it this far, success
3055 return p_buf;
3056 }
3057
3058
3059
3060 void os::large_page_init() {
3061 if (!UseLargePages) return;
3062
3063 // print a warning if any large page related flag is specified on command line
3064 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3065 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3066 bool success = false;
3067
3068 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3069 if (request_lock_memory_privilege()) {
3070 size_t s = GetLargePageMinimum();
3071 if (s) {
3072 #if defined(IA32) || defined(AMD64)
3073 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3074 WARN("JVM cannot use large pages bigger than 4mb.");
3075 } else {
3076 #endif
3077 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3078 _large_page_size = LargePageSizeInBytes;
3079 } else {
3080 _large_page_size = s;
3081 }
3082 success = true;
3083 #if defined(IA32) || defined(AMD64)
3084 }
3085 #endif
3086 } else {
3087 WARN("Large page is not supported by the processor.");
3088 }
3089 } else {
3090 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3091 }
3092 #undef WARN
3093
3094 const size_t default_page_size = (size_t) vm_page_size();
3095 if (success && _large_page_size > default_page_size) {
3096 _page_sizes[0] = _large_page_size;
3097 _page_sizes[1] = default_page_size;
3098 _page_sizes[2] = 0;
3099 }
3100
3101 cleanup_after_large_page_init();
3102 UseLargePages = success;
3103 }
3104
3105 // On win32, one cannot release just a part of reserved memory, it's an
3106 // all or nothing deal. When we split a reservation, we must break the
3107 // reservation into two reservations.
3108 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3109 bool realloc) {
3110 if (size > 0) {
3111 release_memory(base, size);
3112 if (realloc) {
3113 reserve_memory(split, base);
3114 }
3115 if (size != split) {
3116 reserve_memory(size - split, base + split);
3117 }
3118 }
3119 }
3120
3121 // Multiple threads can race in this code but it's not possible to unmap small sections of
3122 // virtual space to get requested alignment, like posix-like os's.
3123 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3124 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3125 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3126 "Alignment must be a multiple of allocation granularity (page size)");
3127 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3128
3129 size_t extra_size = size + alignment;
3130 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3131
3132 char* aligned_base = NULL;
3133
3134 do {
3135 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3136 if (extra_base == NULL) {
3137 return NULL;
3138 }
3139 // Do manual alignment
3140 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3141
3142 os::release_memory(extra_base, extra_size);
3143
3144 aligned_base = os::reserve_memory(size, aligned_base);
3145
3146 } while (aligned_base == NULL);
3147
3148 return aligned_base;
3149 }
3150
3151 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3152 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3153 "reserve alignment");
3154 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3155 char* res;
3156 // note that if UseLargePages is on, all the areas that require interleaving
3157 // will go thru reserve_memory_special rather than thru here.
3158 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3159 if (!use_individual) {
3160 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3161 } else {
3162 elapsedTimer reserveTimer;
3163 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3164 // in numa interleaving, we have to allocate pages individually
3165 // (well really chunks of NUMAInterleaveGranularity size)
3166 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3167 if (res == NULL) {
3168 warning("NUMA page allocation failed");
3169 }
3170 if (Verbose && PrintMiscellaneous) {
3171 reserveTimer.stop();
3172 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3173 reserveTimer.milliseconds(), reserveTimer.ticks());
3174 }
3175 }
3176 assert(res == NULL || addr == NULL || addr == res,
3177 "Unexpected address from reserve.");
3178
3179 return res;
3180 }
3181
3182 // Reserve memory at an arbitrary address, only if that area is
3183 // available (and not reserved for something else).
3184 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3185 // Windows os::reserve_memory() fails of the requested address range is
3186 // not avilable.
3187 return reserve_memory(bytes, requested_addr);
3188 }
3189
3190 size_t os::large_page_size() {
3191 return _large_page_size;
3192 }
3193
3194 bool os::can_commit_large_page_memory() {
3195 // Windows only uses large page memory when the entire region is reserved
3196 // and committed in a single VirtualAlloc() call. This may change in the
3197 // future, but with Windows 2003 it's not possible to commit on demand.
3198 return false;
3199 }
3200
3201 bool os::can_execute_large_page_memory() {
3202 return true;
3203 }
3204
3205 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3206 bool exec) {
3207 assert(UseLargePages, "only for large pages");
3208
3209 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3210 return NULL; // Fallback to small pages.
3211 }
3212
3213 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3214 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3215
3216 // with large pages, there are two cases where we need to use Individual Allocation
3217 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3218 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3219 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3220 log_debug(pagesize)("Reserving large pages individually.");
3221
3222 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3223 if (p_buf == NULL) {
3224 // give an appropriate warning message
3225 if (UseNUMAInterleaving) {
3226 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3227 }
3228 if (UseLargePagesIndividualAllocation) {
3229 warning("Individually allocated large pages failed, "
3230 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3231 }
3232 return NULL;
3233 }
3234
3235 return p_buf;
3236
3237 } else {
3238 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3239
3240 // normal policy just allocate it all at once
3241 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3242 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3243 if (res != NULL) {
3244 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3245 }
3246
3247 return res;
3248 }
3249 }
3250
3251 bool os::release_memory_special(char* base, size_t bytes) {
3252 assert(base != NULL, "Sanity check");
3253 return release_memory(base, bytes);
3254 }
3255
3256 void os::print_statistics() {
3257 }
3258
3259 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3260 int err = os::get_last_error();
3261 char buf[256];
3262 size_t buf_len = os::lasterror(buf, sizeof(buf));
3263 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3264 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3265 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3266 }
3267
3268 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3269 if (bytes == 0) {
3270 // Don't bother the OS with noops.
3271 return true;
3272 }
3273 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3274 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3275 // Don't attempt to print anything if the OS call fails. We're
3276 // probably low on resources, so the print itself may cause crashes.
3277
3278 // unless we have NUMAInterleaving enabled, the range of a commit
3279 // is always within a reserve covered by a single VirtualAlloc
3280 // in that case we can just do a single commit for the requested size
3281 if (!UseNUMAInterleaving) {
3282 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3283 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3284 return false;
3285 }
3286 if (exec) {
3287 DWORD oldprot;
3288 // Windows doc says to use VirtualProtect to get execute permissions
3289 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3290 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3291 return false;
3292 }
3293 }
3294 return true;
3295 } else {
3296
3297 // when NUMAInterleaving is enabled, the commit might cover a range that
3298 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3299 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3300 // returns represents the number of bytes that can be committed in one step.
3301 size_t bytes_remaining = bytes;
3302 char * next_alloc_addr = addr;
3303 while (bytes_remaining > 0) {
3304 MEMORY_BASIC_INFORMATION alloc_info;
3305 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3306 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3307 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3308 PAGE_READWRITE) == NULL) {
3309 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3310 exec);)
3311 return false;
3312 }
3313 if (exec) {
3314 DWORD oldprot;
3315 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3316 PAGE_EXECUTE_READWRITE, &oldprot)) {
3317 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3318 exec);)
3319 return false;
3320 }
3321 }
3322 bytes_remaining -= bytes_to_rq;
3323 next_alloc_addr += bytes_to_rq;
3324 }
3325 }
3326 // if we made it this far, return true
3327 return true;
3328 }
3329
3330 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3331 bool exec) {
3332 // alignment_hint is ignored on this OS
3333 return pd_commit_memory(addr, size, exec);
3334 }
3335
3336 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3337 const char* mesg) {
3338 assert(mesg != NULL, "mesg must be specified");
3339 if (!pd_commit_memory(addr, size, exec)) {
3340 warn_fail_commit_memory(addr, size, exec);
3341 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3342 }
3343 }
3344
3345 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3346 size_t alignment_hint, bool exec,
3347 const char* mesg) {
3348 // alignment_hint is ignored on this OS
3349 pd_commit_memory_or_exit(addr, size, exec, mesg);
3350 }
3351
3352 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3353 if (bytes == 0) {
3354 // Don't bother the OS with noops.
3355 return true;
3356 }
3357 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3358 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3359 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3360 }
3361
3362 bool os::pd_release_memory(char* addr, size_t bytes) {
3363 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3364 }
3365
3366 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3367 return os::commit_memory(addr, size, !ExecMem);
3368 }
3369
3370 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3371 return os::uncommit_memory(addr, size);
3372 }
3373
3374 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3375 uint count = 0;
3376 bool ret = false;
3377 size_t bytes_remaining = bytes;
3378 char * next_protect_addr = addr;
3379
3380 // Use VirtualQuery() to get the chunk size.
3381 while (bytes_remaining) {
3382 MEMORY_BASIC_INFORMATION alloc_info;
3383 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3384 return false;
3385 }
3386
3387 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3388 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3389 // but we don't distinguish here as both cases are protected by same API.
3390 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3391 warning("Failed protecting pages individually for chunk #%u", count);
3392 if (!ret) {
3393 return false;
3394 }
3395
3396 bytes_remaining -= bytes_to_protect;
3397 next_protect_addr += bytes_to_protect;
3398 count++;
3399 }
3400 return ret;
3401 }
3402
3403 // Set protections specified
3404 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3405 bool is_committed) {
3406 unsigned int p = 0;
3407 switch (prot) {
3408 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3409 case MEM_PROT_READ: p = PAGE_READONLY; break;
3410 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3411 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3412 default:
3413 ShouldNotReachHere();
3414 }
3415
3416 DWORD old_status;
3417
3418 // Strange enough, but on Win32 one can change protection only for committed
3419 // memory, not a big deal anyway, as bytes less or equal than 64K
3420 if (!is_committed) {
3421 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3422 "cannot commit protection page");
3423 }
3424 // One cannot use os::guard_memory() here, as on Win32 guard page
3425 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3426 //
3427 // Pages in the region become guard pages. Any attempt to access a guard page
3428 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3429 // the guard page status. Guard pages thus act as a one-time access alarm.
3430 bool ret;
3431 if (UseNUMAInterleaving) {
3432 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3433 // so we must protect the chunks individually.
3434 ret = protect_pages_individually(addr, bytes, p, &old_status);
3435 } else {
3436 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3437 }
3438 #ifdef ASSERT
3439 if (!ret) {
3440 int err = os::get_last_error();
3441 char buf[256];
3442 size_t buf_len = os::lasterror(buf, sizeof(buf));
3443 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3444 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3445 buf_len != 0 ? buf : "<no_error_string>", err);
3446 }
3447 #endif
3448 return ret;
3449 }
3450
3451 bool os::guard_memory(char* addr, size_t bytes) {
3452 DWORD old_status;
3453 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3454 }
3455
3456 bool os::unguard_memory(char* addr, size_t bytes) {
3457 DWORD old_status;
3458 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3459 }
3460
3461 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3462 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3463 void os::numa_make_global(char *addr, size_t bytes) { }
3464 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3465 bool os::numa_topology_changed() { return false; }
3466 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3467 int os::numa_get_group_id() { return 0; }
3468 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3469 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3470 // Provide an answer for UMA systems
3471 ids[0] = 0;
3472 return 1;
3473 } else {
3474 // check for size bigger than actual groups_num
3475 size = MIN2(size, numa_get_groups_num());
3476 for (int i = 0; i < (int)size; i++) {
3477 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3478 }
3479 return size;
3480 }
3481 }
3482
3483 bool os::get_page_info(char *start, page_info* info) {
3484 return false;
3485 }
3486
3487 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3488 page_info* page_found) {
3489 return end;
3490 }
3491
3492 char* os::non_memory_address_word() {
3493 // Must never look like an address returned by reserve_memory,
3494 // even in its subfields (as defined by the CPU immediate fields,
3495 // if the CPU splits constants across multiple instructions).
3496 return (char*)-1;
3497 }
3498
3499 #define MAX_ERROR_COUNT 100
3500 #define SYS_THREAD_ERROR 0xffffffffUL
3501
3502 void os::pd_start_thread(Thread* thread) {
3503 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3504 // Returns previous suspend state:
3505 // 0: Thread was not suspended
3506 // 1: Thread is running now
3507 // >1: Thread is still suspended.
3508 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3509 }
3510
3511 class HighResolutionInterval : public CHeapObj<mtThread> {
3512 // The default timer resolution seems to be 10 milliseconds.
3513 // (Where is this written down?)
3514 // If someone wants to sleep for only a fraction of the default,
3515 // then we set the timer resolution down to 1 millisecond for
3516 // the duration of their interval.
3517 // We carefully set the resolution back, since otherwise we
3518 // seem to incur an overhead (3%?) that we don't need.
3519 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3520 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3521 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3522 // timeBeginPeriod() if the relative error exceeded some threshold.
3523 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3524 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3525 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3526 // resolution timers running.
3527 private:
3528 jlong resolution;
3529 public:
3530 HighResolutionInterval(jlong ms) {
3531 resolution = ms % 10L;
3532 if (resolution != 0) {
3533 MMRESULT result = timeBeginPeriod(1L);
3534 }
3535 }
3536 ~HighResolutionInterval() {
3537 if (resolution != 0) {
3538 MMRESULT result = timeEndPeriod(1L);
3539 }
3540 resolution = 0L;
3541 }
3542 };
3543
3544 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3545 jlong limit = (jlong) MAXDWORD;
3546
3547 while (ms > limit) {
3548 int res;
3549 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3550 return res;
3551 }
3552 ms -= limit;
3553 }
3554
3555 assert(thread == Thread::current(), "thread consistency check");
3556 OSThread* osthread = thread->osthread();
3557 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3558 int result;
3559 if (interruptable) {
3560 assert(thread->is_Java_thread(), "must be java thread");
3561 JavaThread *jt = (JavaThread *) thread;
3562 ThreadBlockInVM tbivm(jt);
3563
3564 jt->set_suspend_equivalent();
3565 // cleared by handle_special_suspend_equivalent_condition() or
3566 // java_suspend_self() via check_and_wait_while_suspended()
3567
3568 HANDLE events[1];
3569 events[0] = osthread->interrupt_event();
3570 HighResolutionInterval *phri=NULL;
3571 if (!ForceTimeHighResolution) {
3572 phri = new HighResolutionInterval(ms);
3573 }
3574 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3575 result = OS_TIMEOUT;
3576 } else {
3577 ResetEvent(osthread->interrupt_event());
3578 osthread->set_interrupted(false);
3579 result = OS_INTRPT;
3580 }
3581 delete phri; //if it is NULL, harmless
3582
3583 // were we externally suspended while we were waiting?
3584 jt->check_and_wait_while_suspended();
3585 } else {
3586 assert(!thread->is_Java_thread(), "must not be java thread");
3587 Sleep((long) ms);
3588 result = OS_TIMEOUT;
3589 }
3590 return result;
3591 }
3592
3593 // Short sleep, direct OS call.
3594 //
3595 // ms = 0, means allow others (if any) to run.
3596 //
3597 void os::naked_short_sleep(jlong ms) {
3598 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3599 Sleep(ms);
3600 }
3601
3602 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3603 void os::infinite_sleep() {
3604 while (true) { // sleep forever ...
3605 Sleep(100000); // ... 100 seconds at a time
3606 }
3607 }
3608
3609 typedef BOOL (WINAPI * STTSignature)(void);
3610
3611 void os::naked_yield() {
3612 // Consider passing back the return value from SwitchToThread().
3613 SwitchToThread();
3614 }
3615
3616 // Win32 only gives you access to seven real priorities at a time,
3617 // so we compress Java's ten down to seven. It would be better
3618 // if we dynamically adjusted relative priorities.
3619
3620 int os::java_to_os_priority[CriticalPriority + 1] = {
3621 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3622 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3623 THREAD_PRIORITY_LOWEST, // 2
3624 THREAD_PRIORITY_BELOW_NORMAL, // 3
3625 THREAD_PRIORITY_BELOW_NORMAL, // 4
3626 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3627 THREAD_PRIORITY_NORMAL, // 6
3628 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3629 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3630 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3631 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3632 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3633 };
3634
3635 int prio_policy1[CriticalPriority + 1] = {
3636 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3637 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3638 THREAD_PRIORITY_LOWEST, // 2
3639 THREAD_PRIORITY_BELOW_NORMAL, // 3
3640 THREAD_PRIORITY_BELOW_NORMAL, // 4
3641 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3642 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3643 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3644 THREAD_PRIORITY_HIGHEST, // 8
3645 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3646 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3647 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3648 };
3649
3650 static int prio_init() {
3651 // If ThreadPriorityPolicy is 1, switch tables
3652 if (ThreadPriorityPolicy == 1) {
3653 int i;
3654 for (i = 0; i < CriticalPriority + 1; i++) {
3655 os::java_to_os_priority[i] = prio_policy1[i];
3656 }
3657 }
3658 if (UseCriticalJavaThreadPriority) {
3659 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3660 }
3661 return 0;
3662 }
3663
3664 OSReturn os::set_native_priority(Thread* thread, int priority) {
3665 if (!UseThreadPriorities) return OS_OK;
3666 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3667 return ret ? OS_OK : OS_ERR;
3668 }
3669
3670 OSReturn os::get_native_priority(const Thread* const thread,
3671 int* priority_ptr) {
3672 if (!UseThreadPriorities) {
3673 *priority_ptr = java_to_os_priority[NormPriority];
3674 return OS_OK;
3675 }
3676 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3677 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3678 assert(false, "GetThreadPriority failed");
3679 return OS_ERR;
3680 }
3681 *priority_ptr = os_prio;
3682 return OS_OK;
3683 }
3684
3685
3686 // Hint to the underlying OS that a task switch would not be good.
3687 // Void return because it's a hint and can fail.
3688 void os::hint_no_preempt() {}
3689
3690 void os::interrupt(Thread* thread) {
3691 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3692 Threads_lock->owned_by_self(),
3693 "possibility of dangling Thread pointer");
3694
3695 OSThread* osthread = thread->osthread();
3696 osthread->set_interrupted(true);
3697 // More than one thread can get here with the same value of osthread,
3698 // resulting in multiple notifications. We do, however, want the store
3699 // to interrupted() to be visible to other threads before we post
3700 // the interrupt event.
3701 OrderAccess::release();
3702 SetEvent(osthread->interrupt_event());
3703 // For JSR166: unpark after setting status
3704 if (thread->is_Java_thread()) {
3705 ((JavaThread*)thread)->parker()->unpark();
3706 }
3707
3708 ParkEvent * ev = thread->_ParkEvent;
3709 if (ev != NULL) ev->unpark();
3710 }
3711
3712
3713 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3714 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3715 "possibility of dangling Thread pointer");
3716
3717 OSThread* osthread = thread->osthread();
3718 // There is no synchronization between the setting of the interrupt
3719 // and it being cleared here. It is critical - see 6535709 - that
3720 // we only clear the interrupt state, and reset the interrupt event,
3721 // if we are going to report that we were indeed interrupted - else
3722 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3723 // depending on the timing. By checking thread interrupt event to see
3724 // if the thread gets real interrupt thus prevent spurious wakeup.
3725 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3726 if (interrupted && clear_interrupted) {
3727 osthread->set_interrupted(false);
3728 ResetEvent(osthread->interrupt_event());
3729 } // Otherwise leave the interrupted state alone
3730
3731 return interrupted;
3732 }
3733
3734 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3735 ExtendedPC os::get_thread_pc(Thread* thread) {
3736 CONTEXT context;
3737 context.ContextFlags = CONTEXT_CONTROL;
3738 HANDLE handle = thread->osthread()->thread_handle();
3739 #ifdef _M_IA64
3740 assert(0, "Fix get_thread_pc");
3741 return ExtendedPC(NULL);
3742 #else
3743 if (GetThreadContext(handle, &context)) {
3744 #ifdef _M_AMD64
3745 return ExtendedPC((address) context.Rip);
3746 #else
3747 return ExtendedPC((address) context.Eip);
3748 #endif
3749 } else {
3750 return ExtendedPC(NULL);
3751 }
3752 #endif
3753 }
3754
3755 // GetCurrentThreadId() returns DWORD
3756 intx os::current_thread_id() { return GetCurrentThreadId(); }
3757
3758 static int _initial_pid = 0;
3759
3760 int os::current_process_id() {
3761 return (_initial_pid ? _initial_pid : _getpid());
3762 }
3763
3764 int os::win32::_vm_page_size = 0;
3765 int os::win32::_vm_allocation_granularity = 0;
3766 int os::win32::_processor_type = 0;
3767 // Processor level is not available on non-NT systems, use vm_version instead
3768 int os::win32::_processor_level = 0;
3769 julong os::win32::_physical_memory = 0;
3770 size_t os::win32::_default_stack_size = 0;
3771
3772 intx os::win32::_os_thread_limit = 0;
3773 volatile intx os::win32::_os_thread_count = 0;
3774
3775 bool os::win32::_is_windows_server = false;
3776
3777 // 6573254
3778 // Currently, the bug is observed across all the supported Windows releases,
3779 // including the latest one (as of this writing - Windows Server 2012 R2)
3780 bool os::win32::_has_exit_bug = true;
3781
3782 void os::win32::initialize_system_info() {
3783 SYSTEM_INFO si;
3784 GetSystemInfo(&si);
3785 _vm_page_size = si.dwPageSize;
3786 _vm_allocation_granularity = si.dwAllocationGranularity;
3787 _processor_type = si.dwProcessorType;
3788 _processor_level = si.wProcessorLevel;
3789 set_processor_count(si.dwNumberOfProcessors);
3790
3791 MEMORYSTATUSEX ms;
3792 ms.dwLength = sizeof(ms);
3793
3794 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3795 // dwMemoryLoad (% of memory in use)
3796 GlobalMemoryStatusEx(&ms);
3797 _physical_memory = ms.ullTotalPhys;
3798
3799 if (FLAG_IS_DEFAULT(MaxRAM)) {
3800 // Adjust MaxRAM according to the maximum virtual address space available.
3801 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3802 }
3803
3804 OSVERSIONINFOEX oi;
3805 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3806 GetVersionEx((OSVERSIONINFO*)&oi);
3807 switch (oi.dwPlatformId) {
3808 case VER_PLATFORM_WIN32_NT:
3809 {
3810 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3811 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3812 oi.wProductType == VER_NT_SERVER) {
3813 _is_windows_server = true;
3814 }
3815 }
3816 break;
3817 default: fatal("Unknown platform");
3818 }
3819
3820 _default_stack_size = os::current_stack_size();
3821 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3822 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3823 "stack size not a multiple of page size");
3824
3825 initialize_performance_counter();
3826 }
3827
3828
3829 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3830 int ebuflen) {
3831 char path[MAX_PATH];
3832 DWORD size;
3833 DWORD pathLen = (DWORD)sizeof(path);
3834 HINSTANCE result = NULL;
3835
3836 // only allow library name without path component
3837 assert(strchr(name, '\\') == NULL, "path not allowed");
3838 assert(strchr(name, ':') == NULL, "path not allowed");
3839 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3840 jio_snprintf(ebuf, ebuflen,
3841 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3842 return NULL;
3843 }
3844
3845 // search system directory
3846 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3847 if (size >= pathLen) {
3848 return NULL; // truncated
3849 }
3850 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3851 return NULL; // truncated
3852 }
3853 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3854 return result;
3855 }
3856 }
3857
3858 // try Windows directory
3859 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3860 if (size >= pathLen) {
3861 return NULL; // truncated
3862 }
3863 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3864 return NULL; // truncated
3865 }
3866 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3867 return result;
3868 }
3869 }
3870
3871 jio_snprintf(ebuf, ebuflen,
3872 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3873 return NULL;
3874 }
3875
3876 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3877 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3878
3879 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3880 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3881 return TRUE;
3882 }
3883
3884 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3885 // Basic approach:
3886 // - Each exiting thread registers its intent to exit and then does so.
3887 // - A thread trying to terminate the process must wait for all
3888 // threads currently exiting to complete their exit.
3889
3890 if (os::win32::has_exit_bug()) {
3891 // The array holds handles of the threads that have started exiting by calling
3892 // _endthreadex().
3893 // Should be large enough to avoid blocking the exiting thread due to lack of
3894 // a free slot.
3895 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3896 static int handle_count = 0;
3897
3898 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3899 static CRITICAL_SECTION crit_sect;
3900 static volatile jint process_exiting = 0;
3901 int i, j;
3902 DWORD res;
3903 HANDLE hproc, hthr;
3904
3905 // We only attempt to register threads until a process exiting
3906 // thread manages to set the process_exiting flag. Any threads
3907 // that come through here after the process_exiting flag is set
3908 // are unregistered and will be caught in the SuspendThread()
3909 // infinite loop below.
3910 bool registered = false;
3911
3912 // The first thread that reached this point, initializes the critical section.
3913 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3914 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3915 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3916 if (what != EPT_THREAD) {
3917 // Atomically set process_exiting before the critical section
3918 // to increase the visibility between racing threads.
3919 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
3920 }
3921 EnterCriticalSection(&crit_sect);
3922
3923 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3924 // Remove from the array those handles of the threads that have completed exiting.
3925 for (i = 0, j = 0; i < handle_count; ++i) {
3926 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3927 if (res == WAIT_TIMEOUT) {
3928 handles[j++] = handles[i];
3929 } else {
3930 if (res == WAIT_FAILED) {
3931 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3932 GetLastError(), __FILE__, __LINE__);
3933 }
3934 // Don't keep the handle, if we failed waiting for it.
3935 CloseHandle(handles[i]);
3936 }
3937 }
3938
3939 // If there's no free slot in the array of the kept handles, we'll have to
3940 // wait until at least one thread completes exiting.
3941 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3942 // Raise the priority of the oldest exiting thread to increase its chances
3943 // to complete sooner.
3944 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3945 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3946 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3947 i = (res - WAIT_OBJECT_0);
3948 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3949 for (; i < handle_count; ++i) {
3950 handles[i] = handles[i + 1];
3951 }
3952 } else {
3953 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3954 (res == WAIT_FAILED ? "failed" : "timed out"),
3955 GetLastError(), __FILE__, __LINE__);
3956 // Don't keep handles, if we failed waiting for them.
3957 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3958 CloseHandle(handles[i]);
3959 }
3960 handle_count = 0;
3961 }
3962 }
3963
3964 // Store a duplicate of the current thread handle in the array of handles.
3965 hproc = GetCurrentProcess();
3966 hthr = GetCurrentThread();
3967 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3968 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3969 warning("DuplicateHandle failed (%u) in %s: %d\n",
3970 GetLastError(), __FILE__, __LINE__);
3971
3972 // We can't register this thread (no more handles) so this thread
3973 // may be racing with a thread that is calling exit(). If the thread
3974 // that is calling exit() has managed to set the process_exiting
3975 // flag, then this thread will be caught in the SuspendThread()
3976 // infinite loop below which closes that race. A small timing
3977 // window remains before the process_exiting flag is set, but it
3978 // is only exposed when we are out of handles.
3979 } else {
3980 ++handle_count;
3981 registered = true;
3982
3983 // The current exiting thread has stored its handle in the array, and now
3984 // should leave the critical section before calling _endthreadex().
3985 }
3986
3987 } else if (what != EPT_THREAD && handle_count > 0) {
3988 jlong start_time, finish_time, timeout_left;
3989 // Before ending the process, make sure all the threads that had called
3990 // _endthreadex() completed.
3991
3992 // Set the priority level of the current thread to the same value as
3993 // the priority level of exiting threads.
3994 // This is to ensure it will be given a fair chance to execute if
3995 // the timeout expires.
3996 hthr = GetCurrentThread();
3997 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3998 start_time = os::javaTimeNanos();
3999 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
4000 for (i = 0; ; ) {
4001 int portion_count = handle_count - i;
4002 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
4003 portion_count = MAXIMUM_WAIT_OBJECTS;
4004 }
4005 for (j = 0; j < portion_count; ++j) {
4006 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4007 }
4008 timeout_left = (finish_time - start_time) / 1000000L;
4009 if (timeout_left < 0) {
4010 timeout_left = 0;
4011 }
4012 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4013 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4014 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4015 (res == WAIT_FAILED ? "failed" : "timed out"),
4016 GetLastError(), __FILE__, __LINE__);
4017 // Reset portion_count so we close the remaining
4018 // handles due to this error.
4019 portion_count = handle_count - i;
4020 }
4021 for (j = 0; j < portion_count; ++j) {
4022 CloseHandle(handles[i + j]);
4023 }
4024 if ((i += portion_count) >= handle_count) {
4025 break;
4026 }
4027 start_time = os::javaTimeNanos();
4028 }
4029 handle_count = 0;
4030 }
4031
4032 LeaveCriticalSection(&crit_sect);
4033 }
4034
4035 if (!registered &&
4036 OrderAccess::load_acquire(&process_exiting) != 0 &&
4037 process_exiting != (jint)GetCurrentThreadId()) {
4038 // Some other thread is about to call exit(), so we don't let
4039 // the current unregistered thread proceed to exit() or _endthreadex()
4040 while (true) {
4041 SuspendThread(GetCurrentThread());
4042 // Avoid busy-wait loop, if SuspendThread() failed.
4043 Sleep(EXIT_TIMEOUT);
4044 }
4045 }
4046 }
4047
4048 // We are here if either
4049 // - there's no 'race at exit' bug on this OS release;
4050 // - initialization of the critical section failed (unlikely);
4051 // - the current thread has registered itself and left the critical section;
4052 // - the process-exiting thread has raised the flag and left the critical section.
4053 if (what == EPT_THREAD) {
4054 _endthreadex((unsigned)exit_code);
4055 } else if (what == EPT_PROCESS) {
4056 ::exit(exit_code);
4057 } else {
4058 _exit(exit_code);
4059 }
4060
4061 // Should not reach here
4062 return exit_code;
4063 }
4064
4065 #undef EXIT_TIMEOUT
4066
4067 void os::win32::setmode_streams() {
4068 _setmode(_fileno(stdin), _O_BINARY);
4069 _setmode(_fileno(stdout), _O_BINARY);
4070 _setmode(_fileno(stderr), _O_BINARY);
4071 }
4072
4073
4074 bool os::is_debugger_attached() {
4075 return IsDebuggerPresent() ? true : false;
4076 }
4077
4078
4079 void os::wait_for_keypress_at_exit(void) {
4080 if (PauseAtExit) {
4081 fprintf(stderr, "Press any key to continue...\n");
4082 fgetc(stdin);
4083 }
4084 }
4085
4086
4087 bool os::message_box(const char* title, const char* message) {
4088 int result = MessageBox(NULL, message, title,
4089 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4090 return result == IDYES;
4091 }
4092
4093 #ifndef PRODUCT
4094 #ifndef _WIN64
4095 // Helpers to check whether NX protection is enabled
4096 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4097 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4098 pex->ExceptionRecord->NumberParameters > 0 &&
4099 pex->ExceptionRecord->ExceptionInformation[0] ==
4100 EXCEPTION_INFO_EXEC_VIOLATION) {
4101 return EXCEPTION_EXECUTE_HANDLER;
4102 }
4103 return EXCEPTION_CONTINUE_SEARCH;
4104 }
4105
4106 void nx_check_protection() {
4107 // If NX is enabled we'll get an exception calling into code on the stack
4108 char code[] = { (char)0xC3 }; // ret
4109 void *code_ptr = (void *)code;
4110 __try {
4111 __asm call code_ptr
4112 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4113 tty->print_raw_cr("NX protection detected.");
4114 }
4115 }
4116 #endif // _WIN64
4117 #endif // PRODUCT
4118
4119 // This is called _before_ the global arguments have been parsed
4120 void os::init(void) {
4121 _initial_pid = _getpid();
4122
4123 init_random(1234567);
4124
4125 win32::initialize_system_info();
4126 win32::setmode_streams();
4127 init_page_sizes((size_t) win32::vm_page_size());
4128
4129 // This may be overridden later when argument processing is done.
4130 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4131
4132 // Initialize main_process and main_thread
4133 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4134 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4135 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4136 fatal("DuplicateHandle failed\n");
4137 }
4138 main_thread_id = (int) GetCurrentThreadId();
4139
4140 // initialize fast thread access - only used for 32-bit
4141 win32::initialize_thread_ptr_offset();
4142 }
4143
4144 // To install functions for atexit processing
4145 extern "C" {
4146 static void perfMemory_exit_helper() {
4147 perfMemory_exit();
4148 }
4149 }
4150
4151 static jint initSock();
4152
4153 // this is called _after_ the global arguments have been parsed
4154 jint os::init_2(void) {
4155 // Allocate a single page and mark it as readable for safepoint polling
4156 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4157 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4158
4159 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4160 guarantee(return_page != NULL, "Commit Failed for polling page");
4161
4162 os::set_polling_page(polling_page);
4163 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4164
4165 if (!UseMembar) {
4166 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4167 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4168
4169 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4170 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4171
4172 os::set_memory_serialize_page(mem_serialize_page);
4173 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4174 }
4175
4176 // Setup Windows Exceptions
4177
4178 // for debugging float code generation bugs
4179 if (ForceFloatExceptions) {
4180 #ifndef _WIN64
4181 static long fp_control_word = 0;
4182 __asm { fstcw fp_control_word }
4183 // see Intel PPro Manual, Vol. 2, p 7-16
4184 const long precision = 0x20;
4185 const long underflow = 0x10;
4186 const long overflow = 0x08;
4187 const long zero_div = 0x04;
4188 const long denorm = 0x02;
4189 const long invalid = 0x01;
4190 fp_control_word |= invalid;
4191 __asm { fldcw fp_control_word }
4192 #endif
4193 }
4194
4195 // If stack_commit_size is 0, windows will reserve the default size,
4196 // but only commit a small portion of it.
4197 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4198 size_t default_reserve_size = os::win32::default_stack_size();
4199 size_t actual_reserve_size = stack_commit_size;
4200 if (stack_commit_size < default_reserve_size) {
4201 // If stack_commit_size == 0, we want this too
4202 actual_reserve_size = default_reserve_size;
4203 }
4204
4205 // Check minimum allowable stack size for thread creation and to initialize
4206 // the java system classes, including StackOverflowError - depends on page
4207 // size. Add two 4K pages for compiler2 recursion in main thread.
4208 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4209 // class initialization depending on 32 or 64 bit VM.
4210 size_t min_stack_allowed =
4211 (size_t)(JavaThread::stack_guard_zone_size() +
4212 JavaThread::stack_shadow_zone_size() +
4213 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4214
4215 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size());
4216
4217 if (actual_reserve_size < min_stack_allowed) {
4218 tty->print_cr("\nThe Java thread stack size specified is too small. "
4219 "Specify at least %dk",
4220 min_stack_allowed / K);
4221 return JNI_ERR;
4222 }
4223
4224 JavaThread::set_stack_size_at_create(stack_commit_size);
4225
4226 // Calculate theoretical max. size of Threads to guard gainst artifical
4227 // out-of-memory situations, where all available address-space has been
4228 // reserved by thread stacks.
4229 assert(actual_reserve_size != 0, "Must have a stack");
4230
4231 // Calculate the thread limit when we should start doing Virtual Memory
4232 // banging. Currently when the threads will have used all but 200Mb of space.
4233 //
4234 // TODO: consider performing a similar calculation for commit size instead
4235 // as reserve size, since on a 64-bit platform we'll run into that more
4236 // often than running out of virtual memory space. We can use the
4237 // lower value of the two calculations as the os_thread_limit.
4238 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4239 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4240
4241 // at exit methods are called in the reverse order of their registration.
4242 // there is no limit to the number of functions registered. atexit does
4243 // not set errno.
4244
4245 if (PerfAllowAtExitRegistration) {
4246 // only register atexit functions if PerfAllowAtExitRegistration is set.
4247 // atexit functions can be delayed until process exit time, which
4248 // can be problematic for embedded VM situations. Embedded VMs should
4249 // call DestroyJavaVM() to assure that VM resources are released.
4250
4251 // note: perfMemory_exit_helper atexit function may be removed in
4252 // the future if the appropriate cleanup code can be added to the
4253 // VM_Exit VMOperation's doit method.
4254 if (atexit(perfMemory_exit_helper) != 0) {
4255 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4256 }
4257 }
4258
4259 #ifndef _WIN64
4260 // Print something if NX is enabled (win32 on AMD64)
4261 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4262 #endif
4263
4264 // initialize thread priority policy
4265 prio_init();
4266
4267 if (UseNUMA && !ForceNUMA) {
4268 UseNUMA = false; // We don't fully support this yet
4269 }
4270
4271 if (UseNUMAInterleaving) {
4272 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4273 bool success = numa_interleaving_init();
4274 if (!success) UseNUMAInterleaving = false;
4275 }
4276
4277 if (initSock() != JNI_OK) {
4278 return JNI_ERR;
4279 }
4280
4281 return JNI_OK;
4282 }
4283
4284 // Mark the polling page as unreadable
4285 void os::make_polling_page_unreadable(void) {
4286 DWORD old_status;
4287 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4288 PAGE_NOACCESS, &old_status)) {
4289 fatal("Could not disable polling page");
4290 }
4291 }
4292
4293 // Mark the polling page as readable
4294 void os::make_polling_page_readable(void) {
4295 DWORD old_status;
4296 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4297 PAGE_READONLY, &old_status)) {
4298 fatal("Could not enable polling page");
4299 }
4300 }
4301
4302
4303 int os::stat(const char *path, struct stat *sbuf) {
4304 char pathbuf[MAX_PATH];
4305 if (strlen(path) > MAX_PATH - 1) {
4306 errno = ENAMETOOLONG;
4307 return -1;
4308 }
4309 os::native_path(strcpy(pathbuf, path));
4310 int ret = ::stat(pathbuf, sbuf);
4311 if (sbuf != NULL && UseUTCFileTimestamp) {
4312 // Fix for 6539723. st_mtime returned from stat() is dependent on
4313 // the system timezone and so can return different values for the
4314 // same file if/when daylight savings time changes. This adjustment
4315 // makes sure the same timestamp is returned regardless of the TZ.
4316 //
4317 // See:
4318 // http://msdn.microsoft.com/library/
4319 // default.asp?url=/library/en-us/sysinfo/base/
4320 // time_zone_information_str.asp
4321 // and
4322 // http://msdn.microsoft.com/library/default.asp?url=
4323 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4324 //
4325 // NOTE: there is a insidious bug here: If the timezone is changed
4326 // after the call to stat() but before 'GetTimeZoneInformation()', then
4327 // the adjustment we do here will be wrong and we'll return the wrong
4328 // value (which will likely end up creating an invalid class data
4329 // archive). Absent a better API for this, or some time zone locking
4330 // mechanism, we'll have to live with this risk.
4331 TIME_ZONE_INFORMATION tz;
4332 DWORD tzid = GetTimeZoneInformation(&tz);
4333 int daylightBias =
4334 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4335 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4336 }
4337 return ret;
4338 }
4339
4340
4341 #define FT2INT64(ft) \
4342 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4343
4344
4345 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4346 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4347 // of a thread.
4348 //
4349 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4350 // the fast estimate available on the platform.
4351
4352 // current_thread_cpu_time() is not optimized for Windows yet
4353 jlong os::current_thread_cpu_time() {
4354 // return user + sys since the cost is the same
4355 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4356 }
4357
4358 jlong os::thread_cpu_time(Thread* thread) {
4359 // consistent with what current_thread_cpu_time() returns.
4360 return os::thread_cpu_time(thread, true /* user+sys */);
4361 }
4362
4363 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4364 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4365 }
4366
4367 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4368 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4369 // If this function changes, os::is_thread_cpu_time_supported() should too
4370 FILETIME CreationTime;
4371 FILETIME ExitTime;
4372 FILETIME KernelTime;
4373 FILETIME UserTime;
4374
4375 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4376 &ExitTime, &KernelTime, &UserTime) == 0) {
4377 return -1;
4378 } else if (user_sys_cpu_time) {
4379 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4380 } else {
4381 return FT2INT64(UserTime) * 100;
4382 }
4383 }
4384
4385 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4386 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4387 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4388 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4389 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4390 }
4391
4392 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4393 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4394 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4395 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4396 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4397 }
4398
4399 bool os::is_thread_cpu_time_supported() {
4400 // see os::thread_cpu_time
4401 FILETIME CreationTime;
4402 FILETIME ExitTime;
4403 FILETIME KernelTime;
4404 FILETIME UserTime;
4405
4406 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4407 &KernelTime, &UserTime) == 0) {
4408 return false;
4409 } else {
4410 return true;
4411 }
4412 }
4413
4414 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4415 // It does have primitives (PDH API) to get CPU usage and run queue length.
4416 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4417 // If we wanted to implement loadavg on Windows, we have a few options:
4418 //
4419 // a) Query CPU usage and run queue length and "fake" an answer by
4420 // returning the CPU usage if it's under 100%, and the run queue
4421 // length otherwise. It turns out that querying is pretty slow
4422 // on Windows, on the order of 200 microseconds on a fast machine.
4423 // Note that on the Windows the CPU usage value is the % usage
4424 // since the last time the API was called (and the first call
4425 // returns 100%), so we'd have to deal with that as well.
4426 //
4427 // b) Sample the "fake" answer using a sampling thread and store
4428 // the answer in a global variable. The call to loadavg would
4429 // just return the value of the global, avoiding the slow query.
4430 //
4431 // c) Sample a better answer using exponential decay to smooth the
4432 // value. This is basically the algorithm used by UNIX kernels.
4433 //
4434 // Note that sampling thread starvation could affect both (b) and (c).
4435 int os::loadavg(double loadavg[], int nelem) {
4436 return -1;
4437 }
4438
4439
4440 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4441 bool os::dont_yield() {
4442 return DontYieldALot;
4443 }
4444
4445 // This method is a slightly reworked copy of JDK's sysOpen
4446 // from src/windows/hpi/src/sys_api_md.c
4447
4448 int os::open(const char *path, int oflag, int mode) {
4449 char pathbuf[MAX_PATH];
4450
4451 if (strlen(path) > MAX_PATH - 1) {
4452 errno = ENAMETOOLONG;
4453 return -1;
4454 }
4455 os::native_path(strcpy(pathbuf, path));
4456 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4457 }
4458
4459 FILE* os::open(int fd, const char* mode) {
4460 return ::_fdopen(fd, mode);
4461 }
4462
4463 // Is a (classpath) directory empty?
4464 bool os::dir_is_empty(const char* path) {
4465 WIN32_FIND_DATA fd;
4466 HANDLE f = FindFirstFile(path, &fd);
4467 if (f == INVALID_HANDLE_VALUE) {
4468 return true;
4469 }
4470 FindClose(f);
4471 return false;
4472 }
4473
4474 // create binary file, rewriting existing file if required
4475 int os::create_binary_file(const char* path, bool rewrite_existing) {
4476 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4477 if (!rewrite_existing) {
4478 oflags |= _O_EXCL;
4479 }
4480 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4481 }
4482
4483 // return current position of file pointer
4484 jlong os::current_file_offset(int fd) {
4485 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4486 }
4487
4488 // move file pointer to the specified offset
4489 jlong os::seek_to_file_offset(int fd, jlong offset) {
4490 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4491 }
4492
4493
4494 jlong os::lseek(int fd, jlong offset, int whence) {
4495 return (jlong) ::_lseeki64(fd, offset, whence);
4496 }
4497
4498 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4499 OVERLAPPED ov;
4500 DWORD nread;
4501 BOOL result;
4502
4503 ZeroMemory(&ov, sizeof(ov));
4504 ov.Offset = (DWORD)offset;
4505 ov.OffsetHigh = (DWORD)(offset >> 32);
4506
4507 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4508
4509 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4510
4511 return result ? nread : 0;
4512 }
4513
4514
4515 // This method is a slightly reworked copy of JDK's sysNativePath
4516 // from src/windows/hpi/src/path_md.c
4517
4518 // Convert a pathname to native format. On win32, this involves forcing all
4519 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4520 // sometimes rejects '/') and removing redundant separators. The input path is
4521 // assumed to have been converted into the character encoding used by the local
4522 // system. Because this might be a double-byte encoding, care is taken to
4523 // treat double-byte lead characters correctly.
4524 //
4525 // This procedure modifies the given path in place, as the result is never
4526 // longer than the original. There is no error return; this operation always
4527 // succeeds.
4528 char * os::native_path(char *path) {
4529 char *src = path, *dst = path, *end = path;
4530 char *colon = NULL; // If a drive specifier is found, this will
4531 // point to the colon following the drive letter
4532
4533 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4534 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4535 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4536
4537 // Check for leading separators
4538 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4539 while (isfilesep(*src)) {
4540 src++;
4541 }
4542
4543 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4544 // Remove leading separators if followed by drive specifier. This
4545 // hack is necessary to support file URLs containing drive
4546 // specifiers (e.g., "file://c:/path"). As a side effect,
4547 // "/c:/path" can be used as an alternative to "c:/path".
4548 *dst++ = *src++;
4549 colon = dst;
4550 *dst++ = ':';
4551 src++;
4552 } else {
4553 src = path;
4554 if (isfilesep(src[0]) && isfilesep(src[1])) {
4555 // UNC pathname: Retain first separator; leave src pointed at
4556 // second separator so that further separators will be collapsed
4557 // into the second separator. The result will be a pathname
4558 // beginning with "\\\\" followed (most likely) by a host name.
4559 src = dst = path + 1;
4560 path[0] = '\\'; // Force first separator to '\\'
4561 }
4562 }
4563
4564 end = dst;
4565
4566 // Remove redundant separators from remainder of path, forcing all
4567 // separators to be '\\' rather than '/'. Also, single byte space
4568 // characters are removed from the end of the path because those
4569 // are not legal ending characters on this operating system.
4570 //
4571 while (*src != '\0') {
4572 if (isfilesep(*src)) {
4573 *dst++ = '\\'; src++;
4574 while (isfilesep(*src)) src++;
4575 if (*src == '\0') {
4576 // Check for trailing separator
4577 end = dst;
4578 if (colon == dst - 2) break; // "z:\\"
4579 if (dst == path + 1) break; // "\\"
4580 if (dst == path + 2 && isfilesep(path[0])) {
4581 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4582 // beginning of a UNC pathname. Even though it is not, by
4583 // itself, a valid UNC pathname, we leave it as is in order
4584 // to be consistent with the path canonicalizer as well
4585 // as the win32 APIs, which treat this case as an invalid
4586 // UNC pathname rather than as an alias for the root
4587 // directory of the current drive.
4588 break;
4589 }
4590 end = --dst; // Path does not denote a root directory, so
4591 // remove trailing separator
4592 break;
4593 }
4594 end = dst;
4595 } else {
4596 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4597 *dst++ = *src++;
4598 if (*src) *dst++ = *src++;
4599 end = dst;
4600 } else { // Copy a single-byte character
4601 char c = *src++;
4602 *dst++ = c;
4603 // Space is not a legal ending character
4604 if (c != ' ') end = dst;
4605 }
4606 }
4607 }
4608
4609 *end = '\0';
4610
4611 // For "z:", add "." to work around a bug in the C runtime library
4612 if (colon == dst - 1) {
4613 path[2] = '.';
4614 path[3] = '\0';
4615 }
4616
4617 return path;
4618 }
4619
4620 // This code is a copy of JDK's sysSetLength
4621 // from src/windows/hpi/src/sys_api_md.c
4622
4623 int os::ftruncate(int fd, jlong length) {
4624 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4625 long high = (long)(length >> 32);
4626 DWORD ret;
4627
4628 if (h == (HANDLE)(-1)) {
4629 return -1;
4630 }
4631
4632 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4633 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4634 return -1;
4635 }
4636
4637 if (::SetEndOfFile(h) == FALSE) {
4638 return -1;
4639 }
4640
4641 return 0;
4642 }
4643
4644 int os::get_fileno(FILE* fp) {
4645 return _fileno(fp);
4646 }
4647
4648 // This code is a copy of JDK's sysSync
4649 // from src/windows/hpi/src/sys_api_md.c
4650 // except for the legacy workaround for a bug in Win 98
4651
4652 int os::fsync(int fd) {
4653 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4654
4655 if ((!::FlushFileBuffers(handle)) &&
4656 (GetLastError() != ERROR_ACCESS_DENIED)) {
4657 // from winerror.h
4658 return -1;
4659 }
4660 return 0;
4661 }
4662
4663 static int nonSeekAvailable(int, long *);
4664 static int stdinAvailable(int, long *);
4665
4666 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4667 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4668
4669 // This code is a copy of JDK's sysAvailable
4670 // from src/windows/hpi/src/sys_api_md.c
4671
4672 int os::available(int fd, jlong *bytes) {
4673 jlong cur, end;
4674 struct _stati64 stbuf64;
4675
4676 if (::_fstati64(fd, &stbuf64) >= 0) {
4677 int mode = stbuf64.st_mode;
4678 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4679 int ret;
4680 long lpbytes;
4681 if (fd == 0) {
4682 ret = stdinAvailable(fd, &lpbytes);
4683 } else {
4684 ret = nonSeekAvailable(fd, &lpbytes);
4685 }
4686 (*bytes) = (jlong)(lpbytes);
4687 return ret;
4688 }
4689 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4690 return FALSE;
4691 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4692 return FALSE;
4693 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4694 return FALSE;
4695 }
4696 *bytes = end - cur;
4697 return TRUE;
4698 } else {
4699 return FALSE;
4700 }
4701 }
4702
4703 void os::flockfile(FILE* fp) {
4704 _lock_file(fp);
4705 }
4706
4707 void os::funlockfile(FILE* fp) {
4708 _unlock_file(fp);
4709 }
4710
4711 // This code is a copy of JDK's nonSeekAvailable
4712 // from src/windows/hpi/src/sys_api_md.c
4713
4714 static int nonSeekAvailable(int fd, long *pbytes) {
4715 // This is used for available on non-seekable devices
4716 // (like both named and anonymous pipes, such as pipes
4717 // connected to an exec'd process).
4718 // Standard Input is a special case.
4719 HANDLE han;
4720
4721 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4722 return FALSE;
4723 }
4724
4725 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4726 // PeekNamedPipe fails when at EOF. In that case we
4727 // simply make *pbytes = 0 which is consistent with the
4728 // behavior we get on Solaris when an fd is at EOF.
4729 // The only alternative is to raise an Exception,
4730 // which isn't really warranted.
4731 //
4732 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4733 return FALSE;
4734 }
4735 *pbytes = 0;
4736 }
4737 return TRUE;
4738 }
4739
4740 #define MAX_INPUT_EVENTS 2000
4741
4742 // This code is a copy of JDK's stdinAvailable
4743 // from src/windows/hpi/src/sys_api_md.c
4744
4745 static int stdinAvailable(int fd, long *pbytes) {
4746 HANDLE han;
4747 DWORD numEventsRead = 0; // Number of events read from buffer
4748 DWORD numEvents = 0; // Number of events in buffer
4749 DWORD i = 0; // Loop index
4750 DWORD curLength = 0; // Position marker
4751 DWORD actualLength = 0; // Number of bytes readable
4752 BOOL error = FALSE; // Error holder
4753 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4754
4755 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4756 return FALSE;
4757 }
4758
4759 // Construct an array of input records in the console buffer
4760 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4761 if (error == 0) {
4762 return nonSeekAvailable(fd, pbytes);
4763 }
4764
4765 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4766 if (numEvents > MAX_INPUT_EVENTS) {
4767 numEvents = MAX_INPUT_EVENTS;
4768 }
4769
4770 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4771 if (lpBuffer == NULL) {
4772 return FALSE;
4773 }
4774
4775 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4776 if (error == 0) {
4777 os::free(lpBuffer);
4778 return FALSE;
4779 }
4780
4781 // Examine input records for the number of bytes available
4782 for (i=0; i<numEvents; i++) {
4783 if (lpBuffer[i].EventType == KEY_EVENT) {
4784
4785 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4786 &(lpBuffer[i].Event);
4787 if (keyRecord->bKeyDown == TRUE) {
4788 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4789 curLength++;
4790 if (*keyPressed == '\r') {
4791 actualLength = curLength;
4792 }
4793 }
4794 }
4795 }
4796
4797 if (lpBuffer != NULL) {
4798 os::free(lpBuffer);
4799 }
4800
4801 *pbytes = (long) actualLength;
4802 return TRUE;
4803 }
4804
4805 // Map a block of memory.
4806 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4807 char *addr, size_t bytes, bool read_only,
4808 bool allow_exec) {
4809 HANDLE hFile;
4810 char* base;
4811
4812 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4813 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4814 if (hFile == NULL) {
4815 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4816 return NULL;
4817 }
4818
4819 if (allow_exec) {
4820 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4821 // unless it comes from a PE image (which the shared archive is not.)
4822 // Even VirtualProtect refuses to give execute access to mapped memory
4823 // that was not previously executable.
4824 //
4825 // Instead, stick the executable region in anonymous memory. Yuck.
4826 // Penalty is that ~4 pages will not be shareable - in the future
4827 // we might consider DLLizing the shared archive with a proper PE
4828 // header so that mapping executable + sharing is possible.
4829
4830 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4831 PAGE_READWRITE);
4832 if (base == NULL) {
4833 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4834 CloseHandle(hFile);
4835 return NULL;
4836 }
4837
4838 DWORD bytes_read;
4839 OVERLAPPED overlapped;
4840 overlapped.Offset = (DWORD)file_offset;
4841 overlapped.OffsetHigh = 0;
4842 overlapped.hEvent = NULL;
4843 // ReadFile guarantees that if the return value is true, the requested
4844 // number of bytes were read before returning.
4845 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4846 if (!res) {
4847 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4848 release_memory(base, bytes);
4849 CloseHandle(hFile);
4850 return NULL;
4851 }
4852 } else {
4853 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4854 NULL /* file_name */);
4855 if (hMap == NULL) {
4856 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4857 CloseHandle(hFile);
4858 return NULL;
4859 }
4860
4861 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4862 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4863 (DWORD)bytes, addr);
4864 if (base == NULL) {
4865 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4866 CloseHandle(hMap);
4867 CloseHandle(hFile);
4868 return NULL;
4869 }
4870
4871 if (CloseHandle(hMap) == 0) {
4872 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4873 CloseHandle(hFile);
4874 return base;
4875 }
4876 }
4877
4878 if (allow_exec) {
4879 DWORD old_protect;
4880 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4881 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4882
4883 if (!res) {
4884 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4885 // Don't consider this a hard error, on IA32 even if the
4886 // VirtualProtect fails, we should still be able to execute
4887 CloseHandle(hFile);
4888 return base;
4889 }
4890 }
4891
4892 if (CloseHandle(hFile) == 0) {
4893 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4894 return base;
4895 }
4896
4897 return base;
4898 }
4899
4900
4901 // Remap a block of memory.
4902 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4903 char *addr, size_t bytes, bool read_only,
4904 bool allow_exec) {
4905 // This OS does not allow existing memory maps to be remapped so we
4906 // have to unmap the memory before we remap it.
4907 if (!os::unmap_memory(addr, bytes)) {
4908 return NULL;
4909 }
4910
4911 // There is a very small theoretical window between the unmap_memory()
4912 // call above and the map_memory() call below where a thread in native
4913 // code may be able to access an address that is no longer mapped.
4914
4915 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4916 read_only, allow_exec);
4917 }
4918
4919
4920 // Unmap a block of memory.
4921 // Returns true=success, otherwise false.
4922
4923 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4924 MEMORY_BASIC_INFORMATION mem_info;
4925 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4926 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4927 return false;
4928 }
4929
4930 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4931 // Instead, executable region was allocated using VirtualAlloc(). See
4932 // pd_map_memory() above.
4933 //
4934 // The following flags should match the 'exec_access' flages used for
4935 // VirtualProtect() in pd_map_memory().
4936 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4937 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4938 return pd_release_memory(addr, bytes);
4939 }
4940
4941 BOOL result = UnmapViewOfFile(addr);
4942 if (result == 0) {
4943 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4944 return false;
4945 }
4946 return true;
4947 }
4948
4949 void os::pause() {
4950 char filename[MAX_PATH];
4951 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4952 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4953 } else {
4954 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4955 }
4956
4957 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4958 if (fd != -1) {
4959 struct stat buf;
4960 ::close(fd);
4961 while (::stat(filename, &buf) == 0) {
4962 Sleep(100);
4963 }
4964 } else {
4965 jio_fprintf(stderr,
4966 "Could not open pause file '%s', continuing immediately.\n", filename);
4967 }
4968 }
4969
4970 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4971 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4972 }
4973
4974 // See the caveats for this class in os_windows.hpp
4975 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4976 // into this method and returns false. If no OS EXCEPTION was raised, returns
4977 // true.
4978 // The callback is supposed to provide the method that should be protected.
4979 //
4980 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4981 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4982 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4983 "crash_protection already set?");
4984
4985 bool success = true;
4986 __try {
4987 WatcherThread::watcher_thread()->set_crash_protection(this);
4988 cb.call();
4989 } __except(EXCEPTION_EXECUTE_HANDLER) {
4990 // only for protection, nothing to do
4991 success = false;
4992 }
4993 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4994 return success;
4995 }
4996
4997 // An Event wraps a win32 "CreateEvent" kernel handle.
4998 //
4999 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5000 //
5001 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5002 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5003 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5004 // In addition, an unpark() operation might fetch the handle field, but the
5005 // event could recycle between the fetch and the SetEvent() operation.
5006 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5007 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5008 // on an stale but recycled handle would be harmless, but in practice this might
5009 // confuse other non-Sun code, so it's not a viable approach.
5010 //
5011 // 2: Once a win32 event handle is associated with an Event, it remains associated
5012 // with the Event. The event handle is never closed. This could be construed
5013 // as handle leakage, but only up to the maximum # of threads that have been extant
5014 // at any one time. This shouldn't be an issue, as windows platforms typically
5015 // permit a process to have hundreds of thousands of open handles.
5016 //
5017 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5018 // and release unused handles.
5019 //
5020 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5021 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5022 //
5023 // 5. Use an RCU-like mechanism (Read-Copy Update).
5024 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5025 //
5026 // We use (2).
5027 //
5028 // TODO-FIXME:
5029 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5030 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5031 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5032 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5033 // into a single win32 CreateEvent() handle.
5034 //
5035 // Assumption:
5036 // Only one parker can exist on an event, which is why we allocate
5037 // them per-thread. Multiple unparkers can coexist.
5038 //
5039 // _Event transitions in park()
5040 // -1 => -1 : illegal
5041 // 1 => 0 : pass - return immediately
5042 // 0 => -1 : block; then set _Event to 0 before returning
5043 //
5044 // _Event transitions in unpark()
5045 // 0 => 1 : just return
5046 // 1 => 1 : just return
5047 // -1 => either 0 or 1; must signal target thread
5048 // That is, we can safely transition _Event from -1 to either
5049 // 0 or 1.
5050 //
5051 // _Event serves as a restricted-range semaphore.
5052 // -1 : thread is blocked, i.e. there is a waiter
5053 // 0 : neutral: thread is running or ready,
5054 // could have been signaled after a wait started
5055 // 1 : signaled - thread is running or ready
5056 //
5057 // Another possible encoding of _Event would be with
5058 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5059 //
5060
5061 int os::PlatformEvent::park(jlong Millis) {
5062 // Transitions for _Event:
5063 // -1 => -1 : illegal
5064 // 1 => 0 : pass - return immediately
5065 // 0 => -1 : block; then set _Event to 0 before returning
5066
5067 guarantee(_ParkHandle != NULL , "Invariant");
5068 guarantee(Millis > 0 , "Invariant");
5069
5070 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5071 // the initial park() operation.
5072 // Consider: use atomic decrement instead of CAS-loop
5073
5074 int v;
5075 for (;;) {
5076 v = _Event;
5077 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5078 }
5079 guarantee((v == 0) || (v == 1), "invariant");
5080 if (v != 0) return OS_OK;
5081
5082 // Do this the hard way by blocking ...
5083 // TODO: consider a brief spin here, gated on the success of recent
5084 // spin attempts by this thread.
5085 //
5086 // We decompose long timeouts into series of shorter timed waits.
5087 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5088 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5089 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5090 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5091 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5092 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5093 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5094 // for the already waited time. This policy does not admit any new outcomes.
5095 // In the future, however, we might want to track the accumulated wait time and
5096 // adjust Millis accordingly if we encounter a spurious wakeup.
5097
5098 const int MAXTIMEOUT = 0x10000000;
5099 DWORD rv = WAIT_TIMEOUT;
5100 while (_Event < 0 && Millis > 0) {
5101 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5102 if (Millis > MAXTIMEOUT) {
5103 prd = MAXTIMEOUT;
5104 }
5105 rv = ::WaitForSingleObject(_ParkHandle, prd);
5106 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5107 if (rv == WAIT_TIMEOUT) {
5108 Millis -= prd;
5109 }
5110 }
5111 v = _Event;
5112 _Event = 0;
5113 // see comment at end of os::PlatformEvent::park() below:
5114 OrderAccess::fence();
5115 // If we encounter a nearly simultanous timeout expiry and unpark()
5116 // we return OS_OK indicating we awoke via unpark().
5117 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5118 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5119 }
5120
5121 void os::PlatformEvent::park() {
5122 // Transitions for _Event:
5123 // -1 => -1 : illegal
5124 // 1 => 0 : pass - return immediately
5125 // 0 => -1 : block; then set _Event to 0 before returning
5126
5127 guarantee(_ParkHandle != NULL, "Invariant");
5128 // Invariant: Only the thread associated with the Event/PlatformEvent
5129 // may call park().
5130 // Consider: use atomic decrement instead of CAS-loop
5131 int v;
5132 for (;;) {
5133 v = _Event;
5134 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5135 }
5136 guarantee((v == 0) || (v == 1), "invariant");
5137 if (v != 0) return;
5138
5139 // Do this the hard way by blocking ...
5140 // TODO: consider a brief spin here, gated on the success of recent
5141 // spin attempts by this thread.
5142 while (_Event < 0) {
5143 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5144 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5145 }
5146
5147 // Usually we'll find _Event == 0 at this point, but as
5148 // an optional optimization we clear it, just in case can
5149 // multiple unpark() operations drove _Event up to 1.
5150 _Event = 0;
5151 OrderAccess::fence();
5152 guarantee(_Event >= 0, "invariant");
5153 }
5154
5155 void os::PlatformEvent::unpark() {
5156 guarantee(_ParkHandle != NULL, "Invariant");
5157
5158 // Transitions for _Event:
5159 // 0 => 1 : just return
5160 // 1 => 1 : just return
5161 // -1 => either 0 or 1; must signal target thread
5162 // That is, we can safely transition _Event from -1 to either
5163 // 0 or 1.
5164 // See also: "Semaphores in Plan 9" by Mullender & Cox
5165 //
5166 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5167 // that it will take two back-to-back park() calls for the owning
5168 // thread to block. This has the benefit of forcing a spurious return
5169 // from the first park() call after an unpark() call which will help
5170 // shake out uses of park() and unpark() without condition variables.
5171
5172 if (Atomic::xchg(1, &_Event) >= 0) return;
5173
5174 ::SetEvent(_ParkHandle);
5175 }
5176
5177
5178 // JSR166
5179 // -------------------------------------------------------
5180
5181 // The Windows implementation of Park is very straightforward: Basic
5182 // operations on Win32 Events turn out to have the right semantics to
5183 // use them directly. We opportunistically resuse the event inherited
5184 // from Monitor.
5185
5186 void Parker::park(bool isAbsolute, jlong time) {
5187 guarantee(_ParkEvent != NULL, "invariant");
5188 // First, demultiplex/decode time arguments
5189 if (time < 0) { // don't wait
5190 return;
5191 } else if (time == 0 && !isAbsolute) {
5192 time = INFINITE;
5193 } else if (isAbsolute) {
5194 time -= os::javaTimeMillis(); // convert to relative time
5195 if (time <= 0) { // already elapsed
5196 return;
5197 }
5198 } else { // relative
5199 time /= 1000000; // Must coarsen from nanos to millis
5200 if (time == 0) { // Wait for the minimal time unit if zero
5201 time = 1;
5202 }
5203 }
5204
5205 JavaThread* thread = JavaThread::current();
5206
5207 // Don't wait if interrupted or already triggered
5208 if (Thread::is_interrupted(thread, false) ||
5209 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5210 ResetEvent(_ParkEvent);
5211 return;
5212 } else {
5213 ThreadBlockInVM tbivm(thread);
5214 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5215 thread->set_suspend_equivalent();
5216
5217 WaitForSingleObject(_ParkEvent, time);
5218 ResetEvent(_ParkEvent);
5219
5220 // If externally suspended while waiting, re-suspend
5221 if (thread->handle_special_suspend_equivalent_condition()) {
5222 thread->java_suspend_self();
5223 }
5224 }
5225 }
5226
5227 void Parker::unpark() {
5228 guarantee(_ParkEvent != NULL, "invariant");
5229 SetEvent(_ParkEvent);
5230 }
5231
5232 // Run the specified command in a separate process. Return its exit value,
5233 // or -1 on failure (e.g. can't create a new process).
5234 int os::fork_and_exec(char* cmd) {
5235 STARTUPINFO si;
5236 PROCESS_INFORMATION pi;
5237
5238 memset(&si, 0, sizeof(si));
5239 si.cb = sizeof(si);
5240 memset(&pi, 0, sizeof(pi));
5241 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5242 cmd, // command line
5243 NULL, // process security attribute
5244 NULL, // thread security attribute
5245 TRUE, // inherits system handles
5246 0, // no creation flags
5247 NULL, // use parent's environment block
5248 NULL, // use parent's starting directory
5249 &si, // (in) startup information
5250 &pi); // (out) process information
5251
5252 if (rslt) {
5253 // Wait until child process exits.
5254 WaitForSingleObject(pi.hProcess, INFINITE);
5255
5256 DWORD exit_code;
5257 GetExitCodeProcess(pi.hProcess, &exit_code);
5258
5259 // Close process and thread handles.
5260 CloseHandle(pi.hProcess);
5261 CloseHandle(pi.hThread);
5262
5263 return (int)exit_code;
5264 } else {
5265 return -1;
5266 }
5267 }
5268
5269 bool os::find(address addr, outputStream* st) {
5270 int offset = -1;
5271 bool result = false;
5272 char buf[256];
5273 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5274 st->print(PTR_FORMAT " ", addr);
5275 if (strlen(buf) < sizeof(buf) - 1) {
5276 char* p = strrchr(buf, '\\');
5277 if (p) {
5278 st->print("%s", p + 1);
5279 } else {
5280 st->print("%s", buf);
5281 }
5282 } else {
5283 // The library name is probably truncated. Let's omit the library name.
5284 // See also JDK-8147512.
5285 }
5286 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5287 st->print("::%s + 0x%x", buf, offset);
5288 }
5289 st->cr();
5290 result = true;
5291 }
5292 return result;
5293 }
5294
5295 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5296 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5297
5298 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5299 JavaThread* thread = JavaThread::current();
5300 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5301 address addr = (address) exceptionRecord->ExceptionInformation[1];
5302
5303 if (os::is_memory_serialize_page(thread, addr)) {
5304 return EXCEPTION_CONTINUE_EXECUTION;
5305 }
5306 }
5307
5308 return EXCEPTION_CONTINUE_SEARCH;
5309 }
5310
5311 // We don't build a headless jre for Windows
5312 bool os::is_headless_jre() { return false; }
5313
5314 static jint initSock() {
5315 WSADATA wsadata;
5316
5317 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5318 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5319 ::GetLastError());
5320 return JNI_ERR;
5321 }
5322 return JNI_OK;
5323 }
5324
5325 struct hostent* os::get_host_by_name(char* name) {
5326 return (struct hostent*)gethostbyname(name);
5327 }
5328
5329 int os::socket_close(int fd) {
5330 return ::closesocket(fd);
5331 }
5332
5333 int os::socket(int domain, int type, int protocol) {
5334 return ::socket(domain, type, protocol);
5335 }
5336
5337 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5338 return ::connect(fd, him, len);
5339 }
5340
5341 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5342 return ::recv(fd, buf, (int)nBytes, flags);
5343 }
5344
5345 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5346 return ::send(fd, buf, (int)nBytes, flags);
5347 }
5348
5349 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5350 return ::send(fd, buf, (int)nBytes, flags);
5351 }
5352
5353 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5354 #if defined(IA32)
5355 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5356 #elif defined (AMD64)
5357 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5358 #endif
5359
5360 // returns true if thread could be suspended,
5361 // false otherwise
5362 static bool do_suspend(HANDLE* h) {
5363 if (h != NULL) {
5364 if (SuspendThread(*h) != ~0) {
5365 return true;
5366 }
5367 }
5368 return false;
5369 }
5370
5371 // resume the thread
5372 // calling resume on an active thread is a no-op
5373 static void do_resume(HANDLE* h) {
5374 if (h != NULL) {
5375 ResumeThread(*h);
5376 }
5377 }
5378
5379 // retrieve a suspend/resume context capable handle
5380 // from the tid. Caller validates handle return value.
5381 void get_thread_handle_for_extended_context(HANDLE* h,
5382 OSThread::thread_id_t tid) {
5383 if (h != NULL) {
5384 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5385 }
5386 }
5387
5388 // Thread sampling implementation
5389 //
5390 void os::SuspendedThreadTask::internal_do_task() {
5391 CONTEXT ctxt;
5392 HANDLE h = NULL;
5393
5394 // get context capable handle for thread
5395 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5396
5397 // sanity
5398 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5399 return;
5400 }
5401
5402 // suspend the thread
5403 if (do_suspend(&h)) {
5404 ctxt.ContextFlags = sampling_context_flags;
5405 // get thread context
5406 GetThreadContext(h, &ctxt);
5407 SuspendedThreadTaskContext context(_thread, &ctxt);
5408 // pass context to Thread Sampling impl
5409 do_task(context);
5410 // resume thread
5411 do_resume(&h);
5412 }
5413
5414 // close handle
5415 CloseHandle(h);
5416 }
5417
5418 bool os::start_debugging(char *buf, int buflen) {
5419 int len = (int)strlen(buf);
5420 char *p = &buf[len];
5421
5422 jio_snprintf(p, buflen-len,
5423 "\n\n"
5424 "Do you want to debug the problem?\n\n"
5425 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5426 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5427 "Otherwise, select 'No' to abort...",
5428 os::current_process_id(), os::current_thread_id());
5429
5430 bool yes = os::message_box("Unexpected Error", buf);
5431
5432 if (yes) {
5433 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5434 // exception. If VM is running inside a debugger, the debugger will
5435 // catch the exception. Otherwise, the breakpoint exception will reach
5436 // the default windows exception handler, which can spawn a debugger and
5437 // automatically attach to the dying VM.
5438 os::breakpoint();
5439 yes = false;
5440 }
5441 return yes;
5442 }
5443
5444 void* os::get_default_process_handle() {
5445 return (void*)GetModuleHandle(NULL);
5446 }
5447
5448 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5449 // which is used to find statically linked in agents.
5450 // Additionally for windows, takes into account __stdcall names.
5451 // Parameters:
5452 // sym_name: Symbol in library we are looking for
5453 // lib_name: Name of library to look in, NULL for shared libs.
5454 // is_absolute_path == true if lib_name is absolute path to agent
5455 // such as "C:/a/b/L.dll"
5456 // == false if only the base name of the library is passed in
5457 // such as "L"
5458 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5459 bool is_absolute_path) {
5460 char *agent_entry_name;
5461 size_t len;
5462 size_t name_len;
5463 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5464 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5465 const char *start;
5466
5467 if (lib_name != NULL) {
5468 len = name_len = strlen(lib_name);
5469 if (is_absolute_path) {
5470 // Need to strip path, prefix and suffix
5471 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5472 lib_name = ++start;
5473 } else {
5474 // Need to check for drive prefix
5475 if ((start = strchr(lib_name, ':')) != NULL) {
5476 lib_name = ++start;
5477 }
5478 }
5479 if (len <= (prefix_len + suffix_len)) {
5480 return NULL;
5481 }
5482 lib_name += prefix_len;
5483 name_len = strlen(lib_name) - suffix_len;
5484 }
5485 }
5486 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5487 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5488 if (agent_entry_name == NULL) {
5489 return NULL;
5490 }
5491 if (lib_name != NULL) {
5492 const char *p = strrchr(sym_name, '@');
5493 if (p != NULL && p != sym_name) {
5494 // sym_name == _Agent_OnLoad@XX
5495 strncpy(agent_entry_name, sym_name, (p - sym_name));
5496 agent_entry_name[(p-sym_name)] = '\0';
5497 // agent_entry_name == _Agent_OnLoad
5498 strcat(agent_entry_name, "_");
5499 strncat(agent_entry_name, lib_name, name_len);
5500 strcat(agent_entry_name, p);
5501 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5502 } else {
5503 strcpy(agent_entry_name, sym_name);
5504 strcat(agent_entry_name, "_");
5505 strncat(agent_entry_name, lib_name, name_len);
5506 }
5507 } else {
5508 strcpy(agent_entry_name, sym_name);
5509 }
5510 return agent_entry_name;
5511 }
5512
5513 #ifndef PRODUCT
5514
5515 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5516 // contiguous memory block at a particular address.
5517 // The test first tries to find a good approximate address to allocate at by using the same
5518 // method to allocate some memory at any address. The test then tries to allocate memory in
5519 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5520 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5521 // the previously allocated memory is available for allocation. The only actual failure
5522 // that is reported is when the test tries to allocate at a particular location but gets a
5523 // different valid one. A NULL return value at this point is not considered an error but may
5524 // be legitimate.
5525 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5526 void TestReserveMemorySpecial_test() {
5527 if (!UseLargePages) {
5528 if (VerboseInternalVMTests) {
5529 tty->print("Skipping test because large pages are disabled");
5530 }
5531 return;
5532 }
5533 // save current value of globals
5534 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5535 bool old_use_numa_interleaving = UseNUMAInterleaving;
5536
5537 // set globals to make sure we hit the correct code path
5538 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5539
5540 // do an allocation at an address selected by the OS to get a good one.
5541 const size_t large_allocation_size = os::large_page_size() * 4;
5542 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5543 if (result == NULL) {
5544 if (VerboseInternalVMTests) {
5545 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5546 large_allocation_size);
5547 }
5548 } else {
5549 os::release_memory_special(result, large_allocation_size);
5550
5551 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5552 // we managed to get it once.
5553 const size_t expected_allocation_size = os::large_page_size();
5554 char* expected_location = result + os::large_page_size();
5555 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5556 if (actual_location == NULL) {
5557 if (VerboseInternalVMTests) {
5558 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5559 expected_location, large_allocation_size);
5560 }
5561 } else {
5562 // release memory
5563 os::release_memory_special(actual_location, expected_allocation_size);
5564 // only now check, after releasing any memory to avoid any leaks.
5565 assert(actual_location == expected_location,
5566 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5567 expected_location, expected_allocation_size, actual_location);
5568 }
5569 }
5570
5571 // restore globals
5572 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5573 UseNUMAInterleaving = old_use_numa_interleaving;
5574 }
5575 #endif // PRODUCT
5576
5577 /*
5578 All the defined signal names for Windows.
5579
5580 NOTE that not all of these names are accepted by FindSignal!
5581
5582 For various reasons some of these may be rejected at runtime.
5583
5584 Here are the names currently accepted by a user of sun.misc.Signal with
5585 1.4.1 (ignoring potential interaction with use of chaining, etc):
5586
5587 (LIST TBD)
5588
5589 */
5590 int os::get_signal_number(const char* name) {
5591 static const struct {
5592 char* name;
5593 int number;
5594 } siglabels [] =
5595 // derived from version 6.0 VC98/include/signal.h
5596 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5597 "FPE", SIGFPE, // floating point exception
5598 "SEGV", SIGSEGV, // segment violation
5599 "INT", SIGINT, // interrupt
5600 "TERM", SIGTERM, // software term signal from kill
5601 "BREAK", SIGBREAK, // Ctrl-Break sequence
5602 "ILL", SIGILL}; // illegal instruction
5603 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5604 if (strcmp(name, siglabels[i].name) == 0) {
5605 return siglabels[i].number;
5606 }
5607 }
5608 return -1;
5609 }
5610
5611 // Fast current thread access
5612
5613 int os::win32::_thread_ptr_offset = 0;
5614
5615 static void call_wrapper_dummy() {}
5616
5617 // We need to call the os_exception_wrapper once so that it sets
5618 // up the offset from FS of the thread pointer.
5619 void os::win32::initialize_thread_ptr_offset() {
5620 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5621 NULL, NULL, NULL, NULL);
5622 }