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 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
407 const struct tm* time_struct_ptr = gmtime(clock);
408 if (time_struct_ptr != NULL) {
409 *res = *time_struct_ptr;
410 return res;
411 }
412 return NULL;
413 }
414
415 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
416
417 // Thread start routine for all newly created threads
418 static unsigned __stdcall thread_native_entry(Thread* thread) {
419 // Try to randomize the cache line index of hot stack frames.
420 // This helps when threads of the same stack traces evict each other's
421 // cache lines. The threads can be either from the same JVM instance, or
422 // from different JVM instances. The benefit is especially true for
423 // processors with hyperthreading technology.
424 static int counter = 0;
425 int pid = os::current_process_id();
426 _alloca(((pid ^ counter++) & 7) * 128);
427
428 thread->initialize_thread_current();
429
430 OSThread* osthr = thread->osthread();
431 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
432
433 if (UseNUMA) {
434 int lgrp_id = os::numa_get_group_id();
435 if (lgrp_id != -1) {
436 thread->set_lgrp_id(lgrp_id);
437 }
438 }
439
440 // Diagnostic code to investigate JDK-6573254
441 int res = 30115; // non-java thread
442 if (thread->is_Java_thread()) {
443 res = 20115; // java thread
444 }
445
446 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
447
448 // Install a win32 structured exception handler around every thread created
449 // by VM, so VM can generate error dump when an exception occurred in non-
450 // Java thread (e.g. VM thread).
451 __try {
452 thread->run();
453 } __except(topLevelExceptionFilter(
454 (_EXCEPTION_POINTERS*)_exception_info())) {
455 // Nothing to do.
456 }
457
458 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
459
460 // One less thread is executing
461 // When the VMThread gets here, the main thread may have already exited
462 // which frees the CodeHeap containing the Atomic::add code
463 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
464 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
465 }
466
467 // If a thread has not deleted itself ("delete this") as part of its
468 // termination sequence, we have to ensure thread-local-storage is
469 // cleared before we actually terminate. No threads should ever be
470 // deleted asynchronously with respect to their termination.
471 if (Thread::current_or_null_safe() != NULL) {
472 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
473 thread->clear_thread_current();
474 }
475
476 // Thread must not return from exit_process_or_thread(), but if it does,
477 // let it proceed to exit normally
478 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
479 }
480
481 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
482 int thread_id) {
483 // Allocate the OSThread object
484 OSThread* osthread = new OSThread(NULL, NULL);
485 if (osthread == NULL) return NULL;
486
487 // Initialize support for Java interrupts
488 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
489 if (interrupt_event == NULL) {
490 delete osthread;
491 return NULL;
492 }
493 osthread->set_interrupt_event(interrupt_event);
494
495 // Store info on the Win32 thread into the OSThread
496 osthread->set_thread_handle(thread_handle);
497 osthread->set_thread_id(thread_id);
498
499 if (UseNUMA) {
500 int lgrp_id = os::numa_get_group_id();
501 if (lgrp_id != -1) {
502 thread->set_lgrp_id(lgrp_id);
503 }
504 }
505
506 // Initial thread state is INITIALIZED, not SUSPENDED
507 osthread->set_state(INITIALIZED);
508
509 return osthread;
510 }
511
512
513 bool os::create_attached_thread(JavaThread* thread) {
514 #ifdef ASSERT
515 thread->verify_not_published();
516 #endif
517 HANDLE thread_h;
518 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
519 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
520 fatal("DuplicateHandle failed\n");
521 }
522 OSThread* osthread = create_os_thread(thread, thread_h,
523 (int)current_thread_id());
524 if (osthread == NULL) {
525 return false;
526 }
527
528 // Initial thread state is RUNNABLE
529 osthread->set_state(RUNNABLE);
530
531 thread->set_osthread(osthread);
532
533 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
534 os::current_thread_id());
535
536 return true;
537 }
538
539 bool os::create_main_thread(JavaThread* thread) {
540 #ifdef ASSERT
541 thread->verify_not_published();
542 #endif
543 if (_starting_thread == NULL) {
544 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
545 if (_starting_thread == NULL) {
546 return false;
547 }
548 }
549
550 // The primordial thread is runnable from the start)
551 _starting_thread->set_state(RUNNABLE);
552
553 thread->set_osthread(_starting_thread);
554 return true;
555 }
556
557 // Helper function to trace _beginthreadex attributes,
558 // similar to os::Posix::describe_pthread_attr()
559 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
560 size_t stacksize, unsigned initflag) {
561 stringStream ss(buf, buflen);
562 if (stacksize == 0) {
563 ss.print("stacksize: default, ");
564 } else {
565 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
566 }
567 ss.print("flags: ");
568 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
569 #define ALL(X) \
570 X(CREATE_SUSPENDED) \
571 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
572 ALL(PRINT_FLAG)
573 #undef ALL
574 #undef PRINT_FLAG
575 return buf;
576 }
577
578 // Allocate and initialize a new OSThread
579 bool os::create_thread(Thread* thread, ThreadType thr_type,
580 size_t stack_size) {
581 unsigned thread_id;
582
583 // Allocate the OSThread object
584 OSThread* osthread = new OSThread(NULL, NULL);
585 if (osthread == NULL) {
586 return false;
587 }
588
589 // Initialize support for Java interrupts
590 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
591 if (interrupt_event == NULL) {
592 delete osthread;
593 return NULL;
594 }
595 osthread->set_interrupt_event(interrupt_event);
596 osthread->set_interrupted(false);
597
598 thread->set_osthread(osthread);
599
600 if (stack_size == 0) {
601 switch (thr_type) {
602 case os::java_thread:
603 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
604 if (JavaThread::stack_size_at_create() > 0) {
605 stack_size = JavaThread::stack_size_at_create();
606 }
607 break;
608 case os::compiler_thread:
609 if (CompilerThreadStackSize > 0) {
610 stack_size = (size_t)(CompilerThreadStackSize * K);
611 break;
612 } // else fall through:
613 // use VMThreadStackSize if CompilerThreadStackSize is not defined
614 case os::vm_thread:
615 case os::pgc_thread:
616 case os::cgc_thread:
617 case os::watcher_thread:
618 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
619 break;
620 }
621 }
622
623 // Create the Win32 thread
624 //
625 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
626 // does not specify stack size. Instead, it specifies the size of
627 // initially committed space. The stack size is determined by
628 // PE header in the executable. If the committed "stack_size" is larger
629 // than default value in the PE header, the stack is rounded up to the
630 // nearest multiple of 1MB. For example if the launcher has default
631 // stack size of 320k, specifying any size less than 320k does not
632 // affect the actual stack size at all, it only affects the initial
633 // commitment. On the other hand, specifying 'stack_size' larger than
634 // default value may cause significant increase in memory usage, because
635 // not only the stack space will be rounded up to MB, but also the
636 // entire space is committed upfront.
637 //
638 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
639 // for CreateThread() that can treat 'stack_size' as stack size. However we
640 // are not supposed to call CreateThread() directly according to MSDN
641 // document because JVM uses C runtime library. The good news is that the
642 // flag appears to work with _beginthredex() as well.
643
644 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
645 HANDLE thread_handle =
646 (HANDLE)_beginthreadex(NULL,
647 (unsigned)stack_size,
648 (unsigned (__stdcall *)(void*)) thread_native_entry,
649 thread,
650 initflag,
651 &thread_id);
652
653 char buf[64];
654 if (thread_handle != NULL) {
655 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
656 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
657 } else {
658 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
659 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
660 }
661
662 if (thread_handle == NULL) {
663 // Need to clean up stuff we've allocated so far
664 CloseHandle(osthread->interrupt_event());
665 thread->set_osthread(NULL);
666 delete osthread;
667 return NULL;
668 }
669
670 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
671
672 // Store info on the Win32 thread into the OSThread
673 osthread->set_thread_handle(thread_handle);
674 osthread->set_thread_id(thread_id);
675
676 // Initial thread state is INITIALIZED, not SUSPENDED
677 osthread->set_state(INITIALIZED);
678
679 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
680 return true;
681 }
682
683
684 // Free Win32 resources related to the OSThread
685 void os::free_thread(OSThread* osthread) {
686 assert(osthread != NULL, "osthread not set");
687
688 // We are told to free resources of the argument thread,
689 // but we can only really operate on the current thread.
690 assert(Thread::current()->osthread() == osthread,
691 "os::free_thread but not current thread");
692
693 CloseHandle(osthread->thread_handle());
694 CloseHandle(osthread->interrupt_event());
695 delete osthread;
696 }
697
698 static jlong first_filetime;
699 static jlong initial_performance_count;
700 static jlong performance_frequency;
701
702
703 jlong as_long(LARGE_INTEGER x) {
704 jlong result = 0; // initialization to avoid warning
705 set_high(&result, x.HighPart);
706 set_low(&result, x.LowPart);
707 return result;
708 }
709
710
711 jlong os::elapsed_counter() {
712 LARGE_INTEGER count;
713 QueryPerformanceCounter(&count);
714 return as_long(count) - initial_performance_count;
715 }
716
717
718 jlong os::elapsed_frequency() {
719 return performance_frequency;
720 }
721
722
723 julong os::available_memory() {
724 return win32::available_memory();
725 }
726
727 julong os::win32::available_memory() {
728 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
729 // value if total memory is larger than 4GB
730 MEMORYSTATUSEX ms;
731 ms.dwLength = sizeof(ms);
732 GlobalMemoryStatusEx(&ms);
733
734 return (julong)ms.ullAvailPhys;
735 }
736
737 julong os::physical_memory() {
738 return win32::physical_memory();
739 }
740
741 bool os::has_allocatable_memory_limit(julong* limit) {
742 MEMORYSTATUSEX ms;
743 ms.dwLength = sizeof(ms);
744 GlobalMemoryStatusEx(&ms);
745 #ifdef _LP64
746 *limit = (julong)ms.ullAvailVirtual;
747 return true;
748 #else
749 // Limit to 1400m because of the 2gb address space wall
750 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
751 return true;
752 #endif
753 }
754
755 int os::active_processor_count() {
756 DWORD_PTR lpProcessAffinityMask = 0;
757 DWORD_PTR lpSystemAffinityMask = 0;
758 int proc_count = processor_count();
759 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
760 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
761 // Nof active processors is number of bits in process affinity mask
762 int bitcount = 0;
763 while (lpProcessAffinityMask != 0) {
764 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
765 bitcount++;
766 }
767 return bitcount;
768 } else {
769 return proc_count;
770 }
771 }
772
773 void os::set_native_thread_name(const char *name) {
774
775 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
776 //
777 // Note that unfortunately this only works if the process
778 // is already attached to a debugger; debugger must observe
779 // the exception below to show the correct name.
780
781 const DWORD MS_VC_EXCEPTION = 0x406D1388;
782 struct {
783 DWORD dwType; // must be 0x1000
784 LPCSTR szName; // pointer to name (in user addr space)
785 DWORD dwThreadID; // thread ID (-1=caller thread)
786 DWORD dwFlags; // reserved for future use, must be zero
787 } info;
788
789 info.dwType = 0x1000;
790 info.szName = name;
791 info.dwThreadID = -1;
792 info.dwFlags = 0;
793
794 __try {
795 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
796 } __except(EXCEPTION_EXECUTE_HANDLER) {}
797 }
798
799 bool os::distribute_processes(uint length, uint* distribution) {
800 // Not yet implemented.
801 return false;
802 }
803
804 bool os::bind_to_processor(uint processor_id) {
805 // Not yet implemented.
806 return false;
807 }
808
809 void os::win32::initialize_performance_counter() {
810 LARGE_INTEGER count;
811 QueryPerformanceFrequency(&count);
812 performance_frequency = as_long(count);
813 QueryPerformanceCounter(&count);
814 initial_performance_count = as_long(count);
815 }
816
817
818 double os::elapsedTime() {
819 return (double) elapsed_counter() / (double) elapsed_frequency();
820 }
821
822
823 // Windows format:
824 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
825 // Java format:
826 // Java standards require the number of milliseconds since 1/1/1970
827
828 // Constant offset - calculated using offset()
829 static jlong _offset = 116444736000000000;
830 // Fake time counter for reproducible results when debugging
831 static jlong fake_time = 0;
832
833 #ifdef ASSERT
834 // Just to be safe, recalculate the offset in debug mode
835 static jlong _calculated_offset = 0;
836 static int _has_calculated_offset = 0;
837
838 jlong offset() {
839 if (_has_calculated_offset) return _calculated_offset;
840 SYSTEMTIME java_origin;
841 java_origin.wYear = 1970;
842 java_origin.wMonth = 1;
843 java_origin.wDayOfWeek = 0; // ignored
844 java_origin.wDay = 1;
845 java_origin.wHour = 0;
846 java_origin.wMinute = 0;
847 java_origin.wSecond = 0;
848 java_origin.wMilliseconds = 0;
849 FILETIME jot;
850 if (!SystemTimeToFileTime(&java_origin, &jot)) {
851 fatal("Error = %d\nWindows error", GetLastError());
852 }
853 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
854 _has_calculated_offset = 1;
855 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
856 return _calculated_offset;
857 }
858 #else
859 jlong offset() {
860 return _offset;
861 }
862 #endif
863
864 jlong windows_to_java_time(FILETIME wt) {
865 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
866 return (a - offset()) / 10000;
867 }
868
869 // Returns time ticks in (10th of micro seconds)
870 jlong windows_to_time_ticks(FILETIME wt) {
871 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
872 return (a - offset());
873 }
874
875 FILETIME java_to_windows_time(jlong l) {
876 jlong a = (l * 10000) + offset();
877 FILETIME result;
878 result.dwHighDateTime = high(a);
879 result.dwLowDateTime = low(a);
880 return result;
881 }
882
883 bool os::supports_vtime() { return true; }
884 bool os::enable_vtime() { return false; }
885 bool os::vtime_enabled() { return false; }
886
887 double os::elapsedVTime() {
888 FILETIME created;
889 FILETIME exited;
890 FILETIME kernel;
891 FILETIME user;
892 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
893 // the resolution of windows_to_java_time() should be sufficient (ms)
894 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
895 } else {
896 return elapsedTime();
897 }
898 }
899
900 jlong os::javaTimeMillis() {
901 if (UseFakeTimers) {
902 return fake_time++;
903 } else {
904 FILETIME wt;
905 GetSystemTimeAsFileTime(&wt);
906 return windows_to_java_time(wt);
907 }
908 }
909
910 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
911 FILETIME wt;
912 GetSystemTimeAsFileTime(&wt);
913 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
914 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
915 seconds = secs;
916 nanos = jlong(ticks - (secs*10000000)) * 100;
917 }
918
919 jlong os::javaTimeNanos() {
920 LARGE_INTEGER current_count;
921 QueryPerformanceCounter(¤t_count);
922 double current = as_long(current_count);
923 double freq = performance_frequency;
924 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
925 return time;
926 }
927
928 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
929 jlong freq = performance_frequency;
930 if (freq < NANOSECS_PER_SEC) {
931 // the performance counter is 64 bits and we will
932 // be multiplying it -- so no wrap in 64 bits
933 info_ptr->max_value = ALL_64_BITS;
934 } else if (freq > NANOSECS_PER_SEC) {
935 // use the max value the counter can reach to
936 // determine the max value which could be returned
937 julong max_counter = (julong)ALL_64_BITS;
938 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
939 } else {
940 // the performance counter is 64 bits and we will
941 // be using it directly -- so no wrap in 64 bits
942 info_ptr->max_value = ALL_64_BITS;
943 }
944
945 // using a counter, so no skipping
946 info_ptr->may_skip_backward = false;
947 info_ptr->may_skip_forward = false;
948
949 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
950 }
951
952 char* os::local_time_string(char *buf, size_t buflen) {
953 SYSTEMTIME st;
954 GetLocalTime(&st);
955 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
956 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
957 return buf;
958 }
959
960 bool os::getTimesSecs(double* process_real_time,
961 double* process_user_time,
962 double* process_system_time) {
963 HANDLE h_process = GetCurrentProcess();
964 FILETIME create_time, exit_time, kernel_time, user_time;
965 BOOL result = GetProcessTimes(h_process,
966 &create_time,
967 &exit_time,
968 &kernel_time,
969 &user_time);
970 if (result != 0) {
971 FILETIME wt;
972 GetSystemTimeAsFileTime(&wt);
973 jlong rtc_millis = windows_to_java_time(wt);
974 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
975 *process_user_time =
976 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
977 *process_system_time =
978 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
979 return true;
980 } else {
981 return false;
982 }
983 }
984
985 void os::shutdown() {
986 // allow PerfMemory to attempt cleanup of any persistent resources
987 perfMemory_exit();
988
989 // flush buffered output, finish log files
990 ostream_abort();
991
992 // Check for abort hook
993 abort_hook_t abort_hook = Arguments::abort_hook();
994 if (abort_hook != NULL) {
995 abort_hook();
996 }
997 }
998
999
1000 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1001 PMINIDUMP_EXCEPTION_INFORMATION,
1002 PMINIDUMP_USER_STREAM_INFORMATION,
1003 PMINIDUMP_CALLBACK_INFORMATION);
1004
1005 static HANDLE dumpFile = NULL;
1006
1007 // Check if dump file can be created.
1008 void os::check_dump_limit(char* buffer, size_t buffsz) {
1009 bool status = true;
1010 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1011 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1012 status = false;
1013 }
1014
1015 #ifndef ASSERT
1016 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1017 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1018 status = false;
1019 }
1020 #endif
1021
1022 if (status) {
1023 const char* cwd = get_current_directory(NULL, 0);
1024 int pid = current_process_id();
1025 if (cwd != NULL) {
1026 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1027 } else {
1028 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1029 }
1030
1031 if (dumpFile == NULL &&
1032 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1033 == INVALID_HANDLE_VALUE) {
1034 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1035 status = false;
1036 }
1037 }
1038 VMError::record_coredump_status(buffer, status);
1039 }
1040
1041 void os::abort(bool dump_core, void* siginfo, const void* context) {
1042 HINSTANCE dbghelp;
1043 EXCEPTION_POINTERS ep;
1044 MINIDUMP_EXCEPTION_INFORMATION mei;
1045 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1046
1047 HANDLE hProcess = GetCurrentProcess();
1048 DWORD processId = GetCurrentProcessId();
1049 MINIDUMP_TYPE dumpType;
1050
1051 shutdown();
1052 if (!dump_core || dumpFile == NULL) {
1053 if (dumpFile != NULL) {
1054 CloseHandle(dumpFile);
1055 }
1056 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1057 }
1058
1059 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1060
1061 if (dbghelp == NULL) {
1062 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1063 CloseHandle(dumpFile);
1064 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1065 }
1066
1067 _MiniDumpWriteDump =
1068 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1069 PMINIDUMP_EXCEPTION_INFORMATION,
1070 PMINIDUMP_USER_STREAM_INFORMATION,
1071 PMINIDUMP_CALLBACK_INFORMATION),
1072 GetProcAddress(dbghelp,
1073 "MiniDumpWriteDump"));
1074
1075 if (_MiniDumpWriteDump == NULL) {
1076 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1077 CloseHandle(dumpFile);
1078 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1079 }
1080
1081 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1082 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1083
1084 if (siginfo != NULL && context != NULL) {
1085 ep.ContextRecord = (PCONTEXT) context;
1086 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1087
1088 mei.ThreadId = GetCurrentThreadId();
1089 mei.ExceptionPointers = &ep;
1090 pmei = &mei;
1091 } else {
1092 pmei = NULL;
1093 }
1094
1095 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1096 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1097 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1098 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1099 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1100 }
1101 CloseHandle(dumpFile);
1102 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1103 }
1104
1105 // Die immediately, no exit hook, no abort hook, no cleanup.
1106 void os::die() {
1107 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1108 }
1109
1110 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1111 // * dirent_md.c 1.15 00/02/02
1112 //
1113 // The declarations for DIR and struct dirent are in jvm_win32.h.
1114
1115 // Caller must have already run dirname through JVM_NativePath, which removes
1116 // duplicate slashes and converts all instances of '/' into '\\'.
1117
1118 DIR * os::opendir(const char *dirname) {
1119 assert(dirname != NULL, "just checking"); // hotspot change
1120 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1121 DWORD fattr; // hotspot change
1122 char alt_dirname[4] = { 0, 0, 0, 0 };
1123
1124 if (dirp == 0) {
1125 errno = ENOMEM;
1126 return 0;
1127 }
1128
1129 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1130 // as a directory in FindFirstFile(). We detect this case here and
1131 // prepend the current drive name.
1132 //
1133 if (dirname[1] == '\0' && dirname[0] == '\\') {
1134 alt_dirname[0] = _getdrive() + 'A' - 1;
1135 alt_dirname[1] = ':';
1136 alt_dirname[2] = '\\';
1137 alt_dirname[3] = '\0';
1138 dirname = alt_dirname;
1139 }
1140
1141 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1142 if (dirp->path == 0) {
1143 free(dirp);
1144 errno = ENOMEM;
1145 return 0;
1146 }
1147 strcpy(dirp->path, dirname);
1148
1149 fattr = GetFileAttributes(dirp->path);
1150 if (fattr == 0xffffffff) {
1151 free(dirp->path);
1152 free(dirp);
1153 errno = ENOENT;
1154 return 0;
1155 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1156 free(dirp->path);
1157 free(dirp);
1158 errno = ENOTDIR;
1159 return 0;
1160 }
1161
1162 // Append "*.*", or possibly "\\*.*", to path
1163 if (dirp->path[1] == ':' &&
1164 (dirp->path[2] == '\0' ||
1165 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1166 // No '\\' needed for cases like "Z:" or "Z:\"
1167 strcat(dirp->path, "*.*");
1168 } else {
1169 strcat(dirp->path, "\\*.*");
1170 }
1171
1172 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1173 if (dirp->handle == INVALID_HANDLE_VALUE) {
1174 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1175 free(dirp->path);
1176 free(dirp);
1177 errno = EACCES;
1178 return 0;
1179 }
1180 }
1181 return dirp;
1182 }
1183
1184 // parameter dbuf unused on Windows
1185 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1186 assert(dirp != NULL, "just checking"); // hotspot change
1187 if (dirp->handle == INVALID_HANDLE_VALUE) {
1188 return 0;
1189 }
1190
1191 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1192
1193 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1194 if (GetLastError() == ERROR_INVALID_HANDLE) {
1195 errno = EBADF;
1196 return 0;
1197 }
1198 FindClose(dirp->handle);
1199 dirp->handle = INVALID_HANDLE_VALUE;
1200 }
1201
1202 return &dirp->dirent;
1203 }
1204
1205 int os::closedir(DIR *dirp) {
1206 assert(dirp != NULL, "just checking"); // hotspot change
1207 if (dirp->handle != INVALID_HANDLE_VALUE) {
1208 if (!FindClose(dirp->handle)) {
1209 errno = EBADF;
1210 return -1;
1211 }
1212 dirp->handle = INVALID_HANDLE_VALUE;
1213 }
1214 free(dirp->path);
1215 free(dirp);
1216 return 0;
1217 }
1218
1219 // This must be hard coded because it's the system's temporary
1220 // directory not the java application's temp directory, ala java.io.tmpdir.
1221 const char* os::get_temp_directory() {
1222 static char path_buf[MAX_PATH];
1223 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1224 return path_buf;
1225 } else {
1226 path_buf[0] = '\0';
1227 return path_buf;
1228 }
1229 }
1230
1231 static bool file_exists(const char* filename) {
1232 if (filename == NULL || strlen(filename) == 0) {
1233 return false;
1234 }
1235 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1236 }
1237
1238 bool os::dll_build_name(char *buffer, size_t buflen,
1239 const char* pname, const char* fname) {
1240 bool retval = false;
1241 const size_t pnamelen = pname ? strlen(pname) : 0;
1242 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1243
1244 // Return error on buffer overflow.
1245 if (pnamelen + strlen(fname) + 10 > buflen) {
1246 return retval;
1247 }
1248
1249 if (pnamelen == 0) {
1250 jio_snprintf(buffer, buflen, "%s.dll", fname);
1251 retval = true;
1252 } else if (c == ':' || c == '\\') {
1253 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1254 retval = true;
1255 } else if (strchr(pname, *os::path_separator()) != NULL) {
1256 int n;
1257 char** pelements = split_path(pname, &n);
1258 if (pelements == NULL) {
1259 return false;
1260 }
1261 for (int i = 0; i < n; i++) {
1262 char* path = pelements[i];
1263 // Really shouldn't be NULL, but check can't hurt
1264 size_t plen = (path == NULL) ? 0 : strlen(path);
1265 if (plen == 0) {
1266 continue; // skip the empty path values
1267 }
1268 const char lastchar = path[plen - 1];
1269 if (lastchar == ':' || lastchar == '\\') {
1270 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1271 } else {
1272 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1273 }
1274 if (file_exists(buffer)) {
1275 retval = true;
1276 break;
1277 }
1278 }
1279 // release the storage
1280 for (int i = 0; i < n; i++) {
1281 if (pelements[i] != NULL) {
1282 FREE_C_HEAP_ARRAY(char, pelements[i]);
1283 }
1284 }
1285 if (pelements != NULL) {
1286 FREE_C_HEAP_ARRAY(char*, pelements);
1287 }
1288 } else {
1289 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1290 retval = true;
1291 }
1292 return retval;
1293 }
1294
1295 // Needs to be in os specific directory because windows requires another
1296 // header file <direct.h>
1297 const char* os::get_current_directory(char *buf, size_t buflen) {
1298 int n = static_cast<int>(buflen);
1299 if (buflen > INT_MAX) n = INT_MAX;
1300 return _getcwd(buf, n);
1301 }
1302
1303 //-----------------------------------------------------------
1304 // Helper functions for fatal error handler
1305 #ifdef _WIN64
1306 // Helper routine which returns true if address in
1307 // within the NTDLL address space.
1308 //
1309 static bool _addr_in_ntdll(address addr) {
1310 HMODULE hmod;
1311 MODULEINFO minfo;
1312
1313 hmod = GetModuleHandle("NTDLL.DLL");
1314 if (hmod == NULL) return false;
1315 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1316 &minfo, sizeof(MODULEINFO))) {
1317 return false;
1318 }
1319
1320 if ((addr >= minfo.lpBaseOfDll) &&
1321 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1322 return true;
1323 } else {
1324 return false;
1325 }
1326 }
1327 #endif
1328
1329 struct _modinfo {
1330 address addr;
1331 char* full_path; // point to a char buffer
1332 int buflen; // size of the buffer
1333 address base_addr;
1334 };
1335
1336 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1337 address top_address, void * param) {
1338 struct _modinfo *pmod = (struct _modinfo *)param;
1339 if (!pmod) return -1;
1340
1341 if (base_addr <= pmod->addr &&
1342 top_address > pmod->addr) {
1343 // if a buffer is provided, copy path name to the buffer
1344 if (pmod->full_path) {
1345 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1346 }
1347 pmod->base_addr = base_addr;
1348 return 1;
1349 }
1350 return 0;
1351 }
1352
1353 bool os::dll_address_to_library_name(address addr, char* buf,
1354 int buflen, int* offset) {
1355 // buf is not optional, but offset is optional
1356 assert(buf != NULL, "sanity check");
1357
1358 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1359 // return the full path to the DLL file, sometimes it returns path
1360 // to the corresponding PDB file (debug info); sometimes it only
1361 // returns partial path, which makes life painful.
1362
1363 struct _modinfo mi;
1364 mi.addr = addr;
1365 mi.full_path = buf;
1366 mi.buflen = buflen;
1367 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1368 // buf already contains path name
1369 if (offset) *offset = addr - mi.base_addr;
1370 return true;
1371 }
1372
1373 buf[0] = '\0';
1374 if (offset) *offset = -1;
1375 return false;
1376 }
1377
1378 bool os::dll_address_to_function_name(address addr, char *buf,
1379 int buflen, int *offset,
1380 bool demangle) {
1381 // buf is not optional, but offset is optional
1382 assert(buf != NULL, "sanity check");
1383
1384 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1385 return true;
1386 }
1387 if (offset != NULL) *offset = -1;
1388 buf[0] = '\0';
1389 return false;
1390 }
1391
1392 // save the start and end address of jvm.dll into param[0] and param[1]
1393 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1394 address top_address, void * param) {
1395 if (!param) return -1;
1396
1397 if (base_addr <= (address)_locate_jvm_dll &&
1398 top_address > (address)_locate_jvm_dll) {
1399 ((address*)param)[0] = base_addr;
1400 ((address*)param)[1] = top_address;
1401 return 1;
1402 }
1403 return 0;
1404 }
1405
1406 address vm_lib_location[2]; // start and end address of jvm.dll
1407
1408 // check if addr is inside jvm.dll
1409 bool os::address_is_in_vm(address addr) {
1410 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1411 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1412 assert(false, "Can't find jvm module.");
1413 return false;
1414 }
1415 }
1416
1417 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1418 }
1419
1420 // print module info; param is outputStream*
1421 static int _print_module(const char* fname, address base_address,
1422 address top_address, void* param) {
1423 if (!param) return -1;
1424
1425 outputStream* st = (outputStream*)param;
1426
1427 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1428 return 0;
1429 }
1430
1431 // Loads .dll/.so and
1432 // in case of error it checks if .dll/.so was built for the
1433 // same architecture as Hotspot is running on
1434 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1435 void * result = LoadLibrary(name);
1436 if (result != NULL) {
1437 return result;
1438 }
1439
1440 DWORD errcode = GetLastError();
1441 if (errcode == ERROR_MOD_NOT_FOUND) {
1442 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1443 ebuf[ebuflen - 1] = '\0';
1444 return NULL;
1445 }
1446
1447 // Parsing dll below
1448 // If we can read dll-info and find that dll was built
1449 // for an architecture other than Hotspot is running in
1450 // - then print to buffer "DLL was built for a different architecture"
1451 // else call os::lasterror to obtain system error message
1452
1453 // Read system error message into ebuf
1454 // It may or may not be overwritten below (in the for loop and just above)
1455 lasterror(ebuf, (size_t) ebuflen);
1456 ebuf[ebuflen - 1] = '\0';
1457 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1458 if (fd < 0) {
1459 return NULL;
1460 }
1461
1462 uint32_t signature_offset;
1463 uint16_t lib_arch = 0;
1464 bool failed_to_get_lib_arch =
1465 ( // Go to position 3c in the dll
1466 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1467 ||
1468 // Read location of signature
1469 (sizeof(signature_offset) !=
1470 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1471 ||
1472 // Go to COFF File Header in dll
1473 // that is located after "signature" (4 bytes long)
1474 (os::seek_to_file_offset(fd,
1475 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1476 ||
1477 // Read field that contains code of architecture
1478 // that dll was built for
1479 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1480 );
1481
1482 ::close(fd);
1483 if (failed_to_get_lib_arch) {
1484 // file i/o error - report os::lasterror(...) msg
1485 return NULL;
1486 }
1487
1488 typedef struct {
1489 uint16_t arch_code;
1490 char* arch_name;
1491 } arch_t;
1492
1493 static const arch_t arch_array[] = {
1494 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1495 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1496 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1497 };
1498 #if (defined _M_IA64)
1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1500 #elif (defined _M_AMD64)
1501 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1502 #elif (defined _M_IX86)
1503 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1504 #else
1505 #error Method os::dll_load requires that one of following \
1506 is defined :_M_IA64,_M_AMD64 or _M_IX86
1507 #endif
1508
1509
1510 // Obtain a string for printf operation
1511 // lib_arch_str shall contain string what platform this .dll was built for
1512 // running_arch_str shall string contain what platform Hotspot was built for
1513 char *running_arch_str = NULL, *lib_arch_str = NULL;
1514 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1515 if (lib_arch == arch_array[i].arch_code) {
1516 lib_arch_str = arch_array[i].arch_name;
1517 }
1518 if (running_arch == arch_array[i].arch_code) {
1519 running_arch_str = arch_array[i].arch_name;
1520 }
1521 }
1522
1523 assert(running_arch_str,
1524 "Didn't find running architecture code in arch_array");
1525
1526 // If the architecture is right
1527 // but some other error took place - report os::lasterror(...) msg
1528 if (lib_arch == running_arch) {
1529 return NULL;
1530 }
1531
1532 if (lib_arch_str != NULL) {
1533 ::_snprintf(ebuf, ebuflen - 1,
1534 "Can't load %s-bit .dll on a %s-bit platform",
1535 lib_arch_str, running_arch_str);
1536 } else {
1537 // don't know what architecture this dll was build for
1538 ::_snprintf(ebuf, ebuflen - 1,
1539 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1540 lib_arch, running_arch_str);
1541 }
1542
1543 return NULL;
1544 }
1545
1546 void os::print_dll_info(outputStream *st) {
1547 st->print_cr("Dynamic libraries:");
1548 get_loaded_modules_info(_print_module, (void *)st);
1549 }
1550
1551 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1552 HANDLE hProcess;
1553
1554 # define MAX_NUM_MODULES 128
1555 HMODULE modules[MAX_NUM_MODULES];
1556 static char filename[MAX_PATH];
1557 int result = 0;
1558
1559 int pid = os::current_process_id();
1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1561 FALSE, pid);
1562 if (hProcess == NULL) return 0;
1563
1564 DWORD size_needed;
1565 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1566 CloseHandle(hProcess);
1567 return 0;
1568 }
1569
1570 // number of modules that are currently loaded
1571 int num_modules = size_needed / sizeof(HMODULE);
1572
1573 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1574 // Get Full pathname:
1575 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1576 filename[0] = '\0';
1577 }
1578
1579 MODULEINFO modinfo;
1580 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1581 modinfo.lpBaseOfDll = NULL;
1582 modinfo.SizeOfImage = 0;
1583 }
1584
1585 // Invoke callback function
1586 result = callback(filename, (address)modinfo.lpBaseOfDll,
1587 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1588 if (result) break;
1589 }
1590
1591 CloseHandle(hProcess);
1592 return result;
1593 }
1594
1595 bool os::get_host_name(char* buf, size_t buflen) {
1596 DWORD size = (DWORD)buflen;
1597 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1598 }
1599
1600 void os::get_summary_os_info(char* buf, size_t buflen) {
1601 stringStream sst(buf, buflen);
1602 os::win32::print_windows_version(&sst);
1603 // chop off newline character
1604 char* nl = strchr(buf, '\n');
1605 if (nl != NULL) *nl = '\0';
1606 }
1607
1608 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1609 int ret = vsnprintf(buf, len, fmt, args);
1610 // Get the correct buffer size if buf is too small
1611 if (ret < 0) {
1612 return _vscprintf(fmt, args);
1613 }
1614 return ret;
1615 }
1616
1617 static inline time_t get_mtime(const char* filename) {
1618 struct stat st;
1619 int ret = os::stat(filename, &st);
1620 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1621 return st.st_mtime;
1622 }
1623
1624 int os::compare_file_modified_times(const char* file1, const char* file2) {
1625 time_t t1 = get_mtime(file1);
1626 time_t t2 = get_mtime(file2);
1627 return t1 - t2;
1628 }
1629
1630 void os::print_os_info_brief(outputStream* st) {
1631 os::print_os_info(st);
1632 }
1633
1634 void os::print_os_info(outputStream* st) {
1635 #ifdef ASSERT
1636 char buffer[1024];
1637 st->print("HostName: ");
1638 if (get_host_name(buffer, sizeof(buffer))) {
1639 st->print("%s ", buffer);
1640 } else {
1641 st->print("N/A ");
1642 }
1643 #endif
1644 st->print("OS:");
1645 os::win32::print_windows_version(st);
1646 }
1647
1648 void os::win32::print_windows_version(outputStream* st) {
1649 OSVERSIONINFOEX osvi;
1650 VS_FIXEDFILEINFO *file_info;
1651 TCHAR kernel32_path[MAX_PATH];
1652 UINT len, ret;
1653
1654 // Use the GetVersionEx information to see if we're on a server or
1655 // workstation edition of Windows. Starting with Windows 8.1 we can't
1656 // trust the OS version information returned by this API.
1657 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1658 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1659 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1660 st->print_cr("Call to GetVersionEx failed");
1661 return;
1662 }
1663 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1664
1665 // Get the full path to \Windows\System32\kernel32.dll and use that for
1666 // determining what version of Windows we're running on.
1667 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1668 ret = GetSystemDirectory(kernel32_path, len);
1669 if (ret == 0 || ret > len) {
1670 st->print_cr("Call to GetSystemDirectory failed");
1671 return;
1672 }
1673 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1674
1675 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1676 if (version_size == 0) {
1677 st->print_cr("Call to GetFileVersionInfoSize failed");
1678 return;
1679 }
1680
1681 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1682 if (version_info == NULL) {
1683 st->print_cr("Failed to allocate version_info");
1684 return;
1685 }
1686
1687 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1688 os::free(version_info);
1689 st->print_cr("Call to GetFileVersionInfo failed");
1690 return;
1691 }
1692
1693 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1694 os::free(version_info);
1695 st->print_cr("Call to VerQueryValue failed");
1696 return;
1697 }
1698
1699 int major_version = HIWORD(file_info->dwProductVersionMS);
1700 int minor_version = LOWORD(file_info->dwProductVersionMS);
1701 int build_number = HIWORD(file_info->dwProductVersionLS);
1702 int build_minor = LOWORD(file_info->dwProductVersionLS);
1703 int os_vers = major_version * 1000 + minor_version;
1704 os::free(version_info);
1705
1706 st->print(" Windows ");
1707 switch (os_vers) {
1708
1709 case 6000:
1710 if (is_workstation) {
1711 st->print("Vista");
1712 } else {
1713 st->print("Server 2008");
1714 }
1715 break;
1716
1717 case 6001:
1718 if (is_workstation) {
1719 st->print("7");
1720 } else {
1721 st->print("Server 2008 R2");
1722 }
1723 break;
1724
1725 case 6002:
1726 if (is_workstation) {
1727 st->print("8");
1728 } else {
1729 st->print("Server 2012");
1730 }
1731 break;
1732
1733 case 6003:
1734 if (is_workstation) {
1735 st->print("8.1");
1736 } else {
1737 st->print("Server 2012 R2");
1738 }
1739 break;
1740
1741 case 10000:
1742 if (is_workstation) {
1743 st->print("10");
1744 } else {
1745 st->print("Server 2016");
1746 }
1747 break;
1748
1749 default:
1750 // Unrecognized windows, print out its major and minor versions
1751 st->print("%d.%d", major_version, minor_version);
1752 break;
1753 }
1754
1755 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1756 // find out whether we are running on 64 bit processor or not
1757 SYSTEM_INFO si;
1758 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1759 GetNativeSystemInfo(&si);
1760 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1761 st->print(" , 64 bit");
1762 }
1763
1764 st->print(" Build %d", build_number);
1765 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1766 st->cr();
1767 }
1768
1769 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1770 // Nothing to do for now.
1771 }
1772
1773 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1774 HKEY key;
1775 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1776 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1777 if (status == ERROR_SUCCESS) {
1778 DWORD size = (DWORD)buflen;
1779 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1780 if (status != ERROR_SUCCESS) {
1781 strncpy(buf, "## __CPU__", buflen);
1782 }
1783 RegCloseKey(key);
1784 } else {
1785 // Put generic cpu info to return
1786 strncpy(buf, "## __CPU__", buflen);
1787 }
1788 }
1789
1790 void os::print_memory_info(outputStream* st) {
1791 st->print("Memory:");
1792 st->print(" %dk page", os::vm_page_size()>>10);
1793
1794 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1795 // value if total memory is larger than 4GB
1796 MEMORYSTATUSEX ms;
1797 ms.dwLength = sizeof(ms);
1798 GlobalMemoryStatusEx(&ms);
1799
1800 st->print(", physical %uk", os::physical_memory() >> 10);
1801 st->print("(%uk free)", os::available_memory() >> 10);
1802
1803 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1804 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1805 st->cr();
1806 }
1807
1808 void os::print_siginfo(outputStream *st, const void* siginfo) {
1809 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1810 st->print("siginfo:");
1811
1812 char tmp[64];
1813 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1814 strcpy(tmp, "EXCEPTION_??");
1815 }
1816 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1817
1818 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1819 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1820 er->NumberParameters >= 2) {
1821 switch (er->ExceptionInformation[0]) {
1822 case 0: st->print(", reading address"); break;
1823 case 1: st->print(", writing address"); break;
1824 case 8: st->print(", data execution prevention violation at address"); break;
1825 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1826 er->ExceptionInformation[0]);
1827 }
1828 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1829 } else {
1830 int num = er->NumberParameters;
1831 if (num > 0) {
1832 st->print(", ExceptionInformation=");
1833 for (int i = 0; i < num; i++) {
1834 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1835 }
1836 }
1837 }
1838 st->cr();
1839 }
1840
1841 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1842 // do nothing
1843 }
1844
1845 static char saved_jvm_path[MAX_PATH] = {0};
1846
1847 // Find the full path to the current module, jvm.dll
1848 void os::jvm_path(char *buf, jint buflen) {
1849 // Error checking.
1850 if (buflen < MAX_PATH) {
1851 assert(false, "must use a large-enough buffer");
1852 buf[0] = '\0';
1853 return;
1854 }
1855 // Lazy resolve the path to current module.
1856 if (saved_jvm_path[0] != 0) {
1857 strcpy(buf, saved_jvm_path);
1858 return;
1859 }
1860
1861 buf[0] = '\0';
1862 if (Arguments::sun_java_launcher_is_altjvm()) {
1863 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1864 // for a JAVA_HOME environment variable and fix up the path so it
1865 // looks like jvm.dll is installed there (append a fake suffix
1866 // hotspot/jvm.dll).
1867 char* java_home_var = ::getenv("JAVA_HOME");
1868 if (java_home_var != NULL && java_home_var[0] != 0 &&
1869 strlen(java_home_var) < (size_t)buflen) {
1870 strncpy(buf, java_home_var, buflen);
1871
1872 // determine if this is a legacy image or modules image
1873 // modules image doesn't have "jre" subdirectory
1874 size_t len = strlen(buf);
1875 char* jrebin_p = buf + len;
1876 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1877 if (0 != _access(buf, 0)) {
1878 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1879 }
1880 len = strlen(buf);
1881 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1882 }
1883 }
1884
1885 if (buf[0] == '\0') {
1886 GetModuleFileName(vm_lib_handle, buf, buflen);
1887 }
1888 strncpy(saved_jvm_path, buf, MAX_PATH);
1889 saved_jvm_path[MAX_PATH - 1] = '\0';
1890 }
1891
1892
1893 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1894 #ifndef _WIN64
1895 st->print("_");
1896 #endif
1897 }
1898
1899
1900 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1901 #ifndef _WIN64
1902 st->print("@%d", args_size * sizeof(int));
1903 #endif
1904 }
1905
1906 // This method is a copy of JDK's sysGetLastErrorString
1907 // from src/windows/hpi/src/system_md.c
1908
1909 size_t os::lasterror(char* buf, size_t len) {
1910 DWORD errval;
1911
1912 if ((errval = GetLastError()) != 0) {
1913 // DOS error
1914 size_t n = (size_t)FormatMessage(
1915 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1916 NULL,
1917 errval,
1918 0,
1919 buf,
1920 (DWORD)len,
1921 NULL);
1922 if (n > 3) {
1923 // Drop final '.', CR, LF
1924 if (buf[n - 1] == '\n') n--;
1925 if (buf[n - 1] == '\r') n--;
1926 if (buf[n - 1] == '.') n--;
1927 buf[n] = '\0';
1928 }
1929 return n;
1930 }
1931
1932 if (errno != 0) {
1933 // C runtime error that has no corresponding DOS error code
1934 const char* s = os::strerror(errno);
1935 size_t n = strlen(s);
1936 if (n >= len) n = len - 1;
1937 strncpy(buf, s, n);
1938 buf[n] = '\0';
1939 return n;
1940 }
1941
1942 return 0;
1943 }
1944
1945 int os::get_last_error() {
1946 DWORD error = GetLastError();
1947 if (error == 0) {
1948 error = errno;
1949 }
1950 return (int)error;
1951 }
1952
1953 WindowsSemaphore::WindowsSemaphore(uint value) {
1954 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1955
1956 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1957 }
1958
1959 WindowsSemaphore::~WindowsSemaphore() {
1960 ::CloseHandle(_semaphore);
1961 }
1962
1963 void WindowsSemaphore::signal(uint count) {
1964 if (count > 0) {
1965 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1966
1967 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1968 }
1969 }
1970
1971 void WindowsSemaphore::wait() {
1972 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1973 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1974 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1975 }
1976
1977 // sun.misc.Signal
1978 // NOTE that this is a workaround for an apparent kernel bug where if
1979 // a signal handler for SIGBREAK is installed then that signal handler
1980 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1981 // See bug 4416763.
1982 static void (*sigbreakHandler)(int) = NULL;
1983
1984 static void UserHandler(int sig, void *siginfo, void *context) {
1985 os::signal_notify(sig);
1986 // We need to reinstate the signal handler each time...
1987 os::signal(sig, (void*)UserHandler);
1988 }
1989
1990 void* os::user_handler() {
1991 return (void*) UserHandler;
1992 }
1993
1994 void* os::signal(int signal_number, void* handler) {
1995 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1996 void (*oldHandler)(int) = sigbreakHandler;
1997 sigbreakHandler = (void (*)(int)) handler;
1998 return (void*) oldHandler;
1999 } else {
2000 return (void*)::signal(signal_number, (void (*)(int))handler);
2001 }
2002 }
2003
2004 void os::signal_raise(int signal_number) {
2005 raise(signal_number);
2006 }
2007
2008 // The Win32 C runtime library maps all console control events other than ^C
2009 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2010 // logoff, and shutdown events. We therefore install our own console handler
2011 // that raises SIGTERM for the latter cases.
2012 //
2013 static BOOL WINAPI consoleHandler(DWORD event) {
2014 switch (event) {
2015 case CTRL_C_EVENT:
2016 if (is_error_reported()) {
2017 // Ctrl-C is pressed during error reporting, likely because the error
2018 // handler fails to abort. Let VM die immediately.
2019 os::die();
2020 }
2021
2022 os::signal_raise(SIGINT);
2023 return TRUE;
2024 break;
2025 case CTRL_BREAK_EVENT:
2026 if (sigbreakHandler != NULL) {
2027 (*sigbreakHandler)(SIGBREAK);
2028 }
2029 return TRUE;
2030 break;
2031 case CTRL_LOGOFF_EVENT: {
2032 // Don't terminate JVM if it is running in a non-interactive session,
2033 // such as a service process.
2034 USEROBJECTFLAGS flags;
2035 HANDLE handle = GetProcessWindowStation();
2036 if (handle != NULL &&
2037 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2038 sizeof(USEROBJECTFLAGS), NULL)) {
2039 // If it is a non-interactive session, let next handler to deal
2040 // with it.
2041 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2042 return FALSE;
2043 }
2044 }
2045 }
2046 case CTRL_CLOSE_EVENT:
2047 case CTRL_SHUTDOWN_EVENT:
2048 os::signal_raise(SIGTERM);
2049 return TRUE;
2050 break;
2051 default:
2052 break;
2053 }
2054 return FALSE;
2055 }
2056
2057 // The following code is moved from os.cpp for making this
2058 // code platform specific, which it is by its very nature.
2059
2060 // Return maximum OS signal used + 1 for internal use only
2061 // Used as exit signal for signal_thread
2062 int os::sigexitnum_pd() {
2063 return NSIG;
2064 }
2065
2066 // a counter for each possible signal value, including signal_thread exit signal
2067 static volatile jint pending_signals[NSIG+1] = { 0 };
2068 static HANDLE sig_sem = NULL;
2069
2070 void os::signal_init_pd() {
2071 // Initialize signal structures
2072 memset((void*)pending_signals, 0, sizeof(pending_signals));
2073
2074 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2075
2076 // Programs embedding the VM do not want it to attempt to receive
2077 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2078 // shutdown hooks mechanism introduced in 1.3. For example, when
2079 // the VM is run as part of a Windows NT service (i.e., a servlet
2080 // engine in a web server), the correct behavior is for any console
2081 // control handler to return FALSE, not TRUE, because the OS's
2082 // "final" handler for such events allows the process to continue if
2083 // it is a service (while terminating it if it is not a service).
2084 // To make this behavior uniform and the mechanism simpler, we
2085 // completely disable the VM's usage of these console events if -Xrs
2086 // (=ReduceSignalUsage) is specified. This means, for example, that
2087 // the CTRL-BREAK thread dump mechanism is also disabled in this
2088 // case. See bugs 4323062, 4345157, and related bugs.
2089
2090 if (!ReduceSignalUsage) {
2091 // Add a CTRL-C handler
2092 SetConsoleCtrlHandler(consoleHandler, TRUE);
2093 }
2094 }
2095
2096 void os::signal_notify(int signal_number) {
2097 BOOL ret;
2098 if (sig_sem != NULL) {
2099 Atomic::inc(&pending_signals[signal_number]);
2100 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2101 assert(ret != 0, "ReleaseSemaphore() failed");
2102 }
2103 }
2104
2105 static int check_pending_signals(bool wait_for_signal) {
2106 DWORD ret;
2107 while (true) {
2108 for (int i = 0; i < NSIG + 1; i++) {
2109 jint n = pending_signals[i];
2110 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2111 return i;
2112 }
2113 }
2114 if (!wait_for_signal) {
2115 return -1;
2116 }
2117
2118 JavaThread *thread = JavaThread::current();
2119
2120 ThreadBlockInVM tbivm(thread);
2121
2122 bool threadIsSuspended;
2123 do {
2124 thread->set_suspend_equivalent();
2125 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2126 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2127 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2128
2129 // were we externally suspended while we were waiting?
2130 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2131 if (threadIsSuspended) {
2132 // The semaphore has been incremented, but while we were waiting
2133 // another thread suspended us. We don't want to continue running
2134 // while suspended because that would surprise the thread that
2135 // suspended us.
2136 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2137 assert(ret != 0, "ReleaseSemaphore() failed");
2138
2139 thread->java_suspend_self();
2140 }
2141 } while (threadIsSuspended);
2142 }
2143 }
2144
2145 int os::signal_lookup() {
2146 return check_pending_signals(false);
2147 }
2148
2149 int os::signal_wait() {
2150 return check_pending_signals(true);
2151 }
2152
2153 // Implicit OS exception handling
2154
2155 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2156 address handler) {
2157 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2158 // Save pc in thread
2159 #ifdef _M_IA64
2160 // Do not blow up if no thread info available.
2161 if (thread) {
2162 // Saving PRECISE pc (with slot information) in thread.
2163 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2164 // Convert precise PC into "Unix" format
2165 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2166 thread->set_saved_exception_pc((address)precise_pc);
2167 }
2168 // Set pc to handler
2169 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2170 // Clear out psr.ri (= Restart Instruction) in order to continue
2171 // at the beginning of the target bundle.
2172 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2173 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2174 #else
2175 #ifdef _M_AMD64
2176 // Do not blow up if no thread info available.
2177 if (thread) {
2178 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2179 }
2180 // Set pc to handler
2181 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2182 #else
2183 // Do not blow up if no thread info available.
2184 if (thread) {
2185 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2186 }
2187 // Set pc to handler
2188 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2189 #endif
2190 #endif
2191
2192 // Continue the execution
2193 return EXCEPTION_CONTINUE_EXECUTION;
2194 }
2195
2196
2197 // Used for PostMortemDump
2198 extern "C" void safepoints();
2199 extern "C" void find(int x);
2200 extern "C" void events();
2201
2202 // According to Windows API documentation, an illegal instruction sequence should generate
2203 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2204 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2205 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2206
2207 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2208
2209 // From "Execution Protection in the Windows Operating System" draft 0.35
2210 // Once a system header becomes available, the "real" define should be
2211 // included or copied here.
2212 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2213
2214 // Handle NAT Bit consumption on IA64.
2215 #ifdef _M_IA64
2216 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2217 #endif
2218
2219 // Windows Vista/2008 heap corruption check
2220 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2221
2222 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2223 // C++ compiler contain this error code. Because this is a compiler-generated
2224 // error, the code is not listed in the Win32 API header files.
2225 // The code is actually a cryptic mnemonic device, with the initial "E"
2226 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2227 // ASCII values of "msc".
2228
2229 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2230
2231 #define def_excpt(val) { #val, (val) }
2232
2233 static const struct { char* name; uint number; } exceptlabels[] = {
2234 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2235 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2236 def_excpt(EXCEPTION_BREAKPOINT),
2237 def_excpt(EXCEPTION_SINGLE_STEP),
2238 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2239 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2240 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2241 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2242 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2243 def_excpt(EXCEPTION_FLT_OVERFLOW),
2244 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2245 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2246 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2247 def_excpt(EXCEPTION_INT_OVERFLOW),
2248 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2249 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2250 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2251 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2252 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2253 def_excpt(EXCEPTION_STACK_OVERFLOW),
2254 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2255 def_excpt(EXCEPTION_GUARD_PAGE),
2256 def_excpt(EXCEPTION_INVALID_HANDLE),
2257 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2258 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2259 #ifdef _M_IA64
2260 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2261 #endif
2262 };
2263
2264 #undef def_excpt
2265
2266 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2267 uint code = static_cast<uint>(exception_code);
2268 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2269 if (exceptlabels[i].number == code) {
2270 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2271 return buf;
2272 }
2273 }
2274
2275 return NULL;
2276 }
2277
2278 //-----------------------------------------------------------------------------
2279 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2280 // handle exception caused by idiv; should only happen for -MinInt/-1
2281 // (division by zero is handled explicitly)
2282 #ifdef _M_IA64
2283 assert(0, "Fix Handle_IDiv_Exception");
2284 #else
2285 #ifdef _M_AMD64
2286 PCONTEXT ctx = exceptionInfo->ContextRecord;
2287 address pc = (address)ctx->Rip;
2288 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2289 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2290 if (pc[0] == 0xF7) {
2291 // set correct result values and continue after idiv instruction
2292 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2293 } else {
2294 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2295 }
2296 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2297 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2298 // idiv opcode (0xF7).
2299 ctx->Rdx = (DWORD)0; // remainder
2300 // Continue the execution
2301 #else
2302 PCONTEXT ctx = exceptionInfo->ContextRecord;
2303 address pc = (address)ctx->Eip;
2304 assert(pc[0] == 0xF7, "not an idiv opcode");
2305 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2306 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2307 // set correct result values and continue after idiv instruction
2308 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2309 ctx->Eax = (DWORD)min_jint; // result
2310 ctx->Edx = (DWORD)0; // remainder
2311 // Continue the execution
2312 #endif
2313 #endif
2314 return EXCEPTION_CONTINUE_EXECUTION;
2315 }
2316
2317 //-----------------------------------------------------------------------------
2318 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2319 PCONTEXT ctx = exceptionInfo->ContextRecord;
2320 #ifndef _WIN64
2321 // handle exception caused by native method modifying control word
2322 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2323
2324 switch (exception_code) {
2325 case EXCEPTION_FLT_DENORMAL_OPERAND:
2326 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2327 case EXCEPTION_FLT_INEXACT_RESULT:
2328 case EXCEPTION_FLT_INVALID_OPERATION:
2329 case EXCEPTION_FLT_OVERFLOW:
2330 case EXCEPTION_FLT_STACK_CHECK:
2331 case EXCEPTION_FLT_UNDERFLOW:
2332 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2333 if (fp_control_word != ctx->FloatSave.ControlWord) {
2334 // Restore FPCW and mask out FLT exceptions
2335 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2336 // Mask out pending FLT exceptions
2337 ctx->FloatSave.StatusWord &= 0xffffff00;
2338 return EXCEPTION_CONTINUE_EXECUTION;
2339 }
2340 }
2341
2342 if (prev_uef_handler != NULL) {
2343 // We didn't handle this exception so pass it to the previous
2344 // UnhandledExceptionFilter.
2345 return (prev_uef_handler)(exceptionInfo);
2346 }
2347 #else // !_WIN64
2348 // On Windows, the mxcsr control bits are non-volatile across calls
2349 // See also CR 6192333
2350 //
2351 jint MxCsr = INITIAL_MXCSR;
2352 // we can't use StubRoutines::addr_mxcsr_std()
2353 // because in Win64 mxcsr is not saved there
2354 if (MxCsr != ctx->MxCsr) {
2355 ctx->MxCsr = MxCsr;
2356 return EXCEPTION_CONTINUE_EXECUTION;
2357 }
2358 #endif // !_WIN64
2359
2360 return EXCEPTION_CONTINUE_SEARCH;
2361 }
2362
2363 static inline void report_error(Thread* t, DWORD exception_code,
2364 address addr, void* siginfo, void* context) {
2365 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2366
2367 // If UseOsErrorReporting, this will return here and save the error file
2368 // somewhere where we can find it in the minidump.
2369 }
2370
2371 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2372 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2373 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2374 address addr = (address) exceptionRecord->ExceptionInformation[1];
2375 if (Interpreter::contains(pc)) {
2376 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2377 if (!fr->is_first_java_frame()) {
2378 // get_frame_at_stack_banging_point() is only called when we
2379 // have well defined stacks so java_sender() calls do not need
2380 // to assert safe_for_sender() first.
2381 *fr = fr->java_sender();
2382 }
2383 } else {
2384 // more complex code with compiled code
2385 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2386 CodeBlob* cb = CodeCache::find_blob(pc);
2387 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2388 // Not sure where the pc points to, fallback to default
2389 // stack overflow handling
2390 return false;
2391 } else {
2392 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2393 // in compiled code, the stack banging is performed just after the return pc
2394 // has been pushed on the stack
2395 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2396 if (!fr->is_java_frame()) {
2397 // See java_sender() comment above.
2398 *fr = fr->java_sender();
2399 }
2400 }
2401 }
2402 assert(fr->is_java_frame(), "Safety check");
2403 return true;
2404 }
2405
2406 //-----------------------------------------------------------------------------
2407 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2408 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2409 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2410 #ifdef _M_IA64
2411 // On Itanium, we need the "precise pc", which has the slot number coded
2412 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2413 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2414 // Convert the pc to "Unix format", which has the slot number coded
2415 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2416 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2417 // information is saved in the Unix format.
2418 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2419 #else
2420 #ifdef _M_AMD64
2421 address pc = (address) exceptionInfo->ContextRecord->Rip;
2422 #else
2423 address pc = (address) exceptionInfo->ContextRecord->Eip;
2424 #endif
2425 #endif
2426 Thread* t = Thread::current_or_null_safe();
2427
2428 // Handle SafeFetch32 and SafeFetchN exceptions.
2429 if (StubRoutines::is_safefetch_fault(pc)) {
2430 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2431 }
2432
2433 #ifndef _WIN64
2434 // Execution protection violation - win32 running on AMD64 only
2435 // Handled first to avoid misdiagnosis as a "normal" access violation;
2436 // This is safe to do because we have a new/unique ExceptionInformation
2437 // code for this condition.
2438 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2439 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2440 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2441 address addr = (address) exceptionRecord->ExceptionInformation[1];
2442
2443 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2444 int page_size = os::vm_page_size();
2445
2446 // Make sure the pc and the faulting address are sane.
2447 //
2448 // If an instruction spans a page boundary, and the page containing
2449 // the beginning of the instruction is executable but the following
2450 // page is not, the pc and the faulting address might be slightly
2451 // different - we still want to unguard the 2nd page in this case.
2452 //
2453 // 15 bytes seems to be a (very) safe value for max instruction size.
2454 bool pc_is_near_addr =
2455 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2456 bool instr_spans_page_boundary =
2457 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2458 (intptr_t) page_size) > 0);
2459
2460 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2461 static volatile address last_addr =
2462 (address) os::non_memory_address_word();
2463
2464 // In conservative mode, don't unguard unless the address is in the VM
2465 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2466 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2467
2468 // Set memory to RWX and retry
2469 address page_start =
2470 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2471 bool res = os::protect_memory((char*) page_start, page_size,
2472 os::MEM_PROT_RWX);
2473
2474 log_debug(os)("Execution protection violation "
2475 "at " INTPTR_FORMAT
2476 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2477 p2i(page_start), (res ? "success" : os::strerror(errno)));
2478
2479 // Set last_addr so if we fault again at the same address, we don't
2480 // end up in an endless loop.
2481 //
2482 // There are two potential complications here. Two threads trapping
2483 // at the same address at the same time could cause one of the
2484 // threads to think it already unguarded, and abort the VM. Likely
2485 // very rare.
2486 //
2487 // The other race involves two threads alternately trapping at
2488 // different addresses and failing to unguard the page, resulting in
2489 // an endless loop. This condition is probably even more unlikely
2490 // than the first.
2491 //
2492 // Although both cases could be avoided by using locks or thread
2493 // local last_addr, these solutions are unnecessary complication:
2494 // this handler is a best-effort safety net, not a complete solution.
2495 // It is disabled by default and should only be used as a workaround
2496 // in case we missed any no-execute-unsafe VM code.
2497
2498 last_addr = addr;
2499
2500 return EXCEPTION_CONTINUE_EXECUTION;
2501 }
2502 }
2503
2504 // Last unguard failed or not unguarding
2505 tty->print_raw_cr("Execution protection violation");
2506 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2507 exceptionInfo->ContextRecord);
2508 return EXCEPTION_CONTINUE_SEARCH;
2509 }
2510 }
2511 #endif // _WIN64
2512
2513 // Check to see if we caught the safepoint code in the
2514 // process of write protecting the memory serialization page.
2515 // It write enables the page immediately after protecting it
2516 // so just return.
2517 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2518 if (t != NULL && t->is_Java_thread()) {
2519 JavaThread* thread = (JavaThread*) t;
2520 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2521 address addr = (address) exceptionRecord->ExceptionInformation[1];
2522 if (os::is_memory_serialize_page(thread, addr)) {
2523 // Block current thread until the memory serialize page permission restored.
2524 os::block_on_serialize_page_trap();
2525 return EXCEPTION_CONTINUE_EXECUTION;
2526 }
2527 }
2528 }
2529
2530 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2531 VM_Version::is_cpuinfo_segv_addr(pc)) {
2532 // Verify that OS save/restore AVX registers.
2533 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2534 }
2535
2536 if (t != NULL && t->is_Java_thread()) {
2537 JavaThread* thread = (JavaThread*) t;
2538 bool in_java = thread->thread_state() == _thread_in_Java;
2539
2540 // Handle potential stack overflows up front.
2541 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2542 #ifdef _M_IA64
2543 // Use guard page for register stack.
2544 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2545 address addr = (address) exceptionRecord->ExceptionInformation[1];
2546 // Check for a register stack overflow on Itanium
2547 if (thread->addr_inside_register_stack_red_zone(addr)) {
2548 // Fatal red zone violation happens if the Java program
2549 // catches a StackOverflow error and does so much processing
2550 // that it runs beyond the unprotected yellow guard zone. As
2551 // a result, we are out of here.
2552 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2553 } else if(thread->addr_inside_register_stack(addr)) {
2554 // Disable the yellow zone which sets the state that
2555 // we've got a stack overflow problem.
2556 if (thread->stack_yellow_reserved_zone_enabled()) {
2557 thread->disable_stack_yellow_reserved_zone();
2558 }
2559 // Give us some room to process the exception.
2560 thread->disable_register_stack_guard();
2561 // Tracing with +Verbose.
2562 if (Verbose) {
2563 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2564 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2565 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2566 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2567 thread->register_stack_base(),
2568 thread->register_stack_base() + thread->stack_size());
2569 }
2570
2571 // Reguard the permanent register stack red zone just to be sure.
2572 // We saw Windows silently disabling this without telling us.
2573 thread->enable_register_stack_red_zone();
2574
2575 return Handle_Exception(exceptionInfo,
2576 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2577 }
2578 #endif
2579 if (thread->stack_guards_enabled()) {
2580 if (in_java) {
2581 frame fr;
2582 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2583 address addr = (address) exceptionRecord->ExceptionInformation[1];
2584 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2585 assert(fr.is_java_frame(), "Must be a Java frame");
2586 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2587 }
2588 }
2589 // Yellow zone violation. The o/s has unprotected the first yellow
2590 // zone page for us. Note: must call disable_stack_yellow_zone to
2591 // update the enabled status, even if the zone contains only one page.
2592 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2593 thread->disable_stack_yellow_reserved_zone();
2594 // If not in java code, return and hope for the best.
2595 return in_java
2596 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2597 : EXCEPTION_CONTINUE_EXECUTION;
2598 } else {
2599 // Fatal red zone violation.
2600 thread->disable_stack_red_zone();
2601 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2602 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2603 exceptionInfo->ContextRecord);
2604 return EXCEPTION_CONTINUE_SEARCH;
2605 }
2606 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2607 // Either stack overflow or null pointer exception.
2608 if (in_java) {
2609 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2610 address addr = (address) exceptionRecord->ExceptionInformation[1];
2611 address stack_end = thread->stack_end();
2612 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2613 // Stack overflow.
2614 assert(!os::uses_stack_guard_pages(),
2615 "should be caught by red zone code above.");
2616 return Handle_Exception(exceptionInfo,
2617 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2618 }
2619 // Check for safepoint polling and implicit null
2620 // We only expect null pointers in the stubs (vtable)
2621 // the rest are checked explicitly now.
2622 CodeBlob* cb = CodeCache::find_blob(pc);
2623 if (cb != NULL) {
2624 if (os::is_poll_address(addr)) {
2625 address stub = SharedRuntime::get_poll_stub(pc);
2626 return Handle_Exception(exceptionInfo, stub);
2627 }
2628 }
2629 {
2630 #ifdef _WIN64
2631 // If it's a legal stack address map the entire region in
2632 //
2633 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2634 address addr = (address) exceptionRecord->ExceptionInformation[1];
2635 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2636 addr = (address)((uintptr_t)addr &
2637 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2638 os::commit_memory((char *)addr, thread->stack_base() - addr,
2639 !ExecMem);
2640 return EXCEPTION_CONTINUE_EXECUTION;
2641 } else
2642 #endif
2643 {
2644 // Null pointer exception.
2645 #ifdef _M_IA64
2646 // Process implicit null checks in compiled code. Note: Implicit null checks
2647 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2648 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2649 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2650 // Handle implicit null check in UEP method entry
2651 if (cb && (cb->is_frame_complete_at(pc) ||
2652 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2653 if (Verbose) {
2654 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2655 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2656 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2657 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2658 *(bundle_start + 1), *bundle_start);
2659 }
2660 return Handle_Exception(exceptionInfo,
2661 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2662 }
2663 }
2664
2665 // Implicit null checks were processed above. Hence, we should not reach
2666 // here in the usual case => die!
2667 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2668 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2669 exceptionInfo->ContextRecord);
2670 return EXCEPTION_CONTINUE_SEARCH;
2671
2672 #else // !IA64
2673
2674 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2675 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2676 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2677 }
2678 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2679 exceptionInfo->ContextRecord);
2680 return EXCEPTION_CONTINUE_SEARCH;
2681 #endif
2682 }
2683 }
2684 }
2685
2686 #ifdef _WIN64
2687 // Special care for fast JNI field accessors.
2688 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2689 // in and the heap gets shrunk before the field access.
2690 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2691 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2692 if (addr != (address)-1) {
2693 return Handle_Exception(exceptionInfo, addr);
2694 }
2695 }
2696 #endif
2697
2698 // Stack overflow or null pointer exception in native code.
2699 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2700 exceptionInfo->ContextRecord);
2701 return EXCEPTION_CONTINUE_SEARCH;
2702 } // /EXCEPTION_ACCESS_VIOLATION
2703 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2704 #if defined _M_IA64
2705 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2706 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2707 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2708
2709 // Compiled method patched to be non entrant? Following conditions must apply:
2710 // 1. must be first instruction in bundle
2711 // 2. must be a break instruction with appropriate code
2712 if ((((uint64_t) pc & 0x0F) == 0) &&
2713 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2714 return Handle_Exception(exceptionInfo,
2715 (address)SharedRuntime::get_handle_wrong_method_stub());
2716 }
2717 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2718 #endif
2719
2720
2721 if (in_java) {
2722 switch (exception_code) {
2723 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2724 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2725
2726 case EXCEPTION_INT_OVERFLOW:
2727 return Handle_IDiv_Exception(exceptionInfo);
2728
2729 } // switch
2730 }
2731 if (((thread->thread_state() == _thread_in_Java) ||
2732 (thread->thread_state() == _thread_in_native)) &&
2733 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2734 LONG result=Handle_FLT_Exception(exceptionInfo);
2735 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2736 }
2737 }
2738
2739 if (exception_code != EXCEPTION_BREAKPOINT) {
2740 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2741 exceptionInfo->ContextRecord);
2742 }
2743 return EXCEPTION_CONTINUE_SEARCH;
2744 }
2745
2746 #ifndef _WIN64
2747 // Special care for fast JNI accessors.
2748 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2749 // the heap gets shrunk before the field access.
2750 // Need to install our own structured exception handler since native code may
2751 // install its own.
2752 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2753 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2754 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2755 address pc = (address) exceptionInfo->ContextRecord->Eip;
2756 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2757 if (addr != (address)-1) {
2758 return Handle_Exception(exceptionInfo, addr);
2759 }
2760 }
2761 return EXCEPTION_CONTINUE_SEARCH;
2762 }
2763
2764 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2765 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2766 jobject obj, \
2767 jfieldID fieldID) { \
2768 __try { \
2769 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2770 obj, \
2771 fieldID); \
2772 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2773 _exception_info())) { \
2774 } \
2775 return 0; \
2776 }
2777
2778 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2779 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2780 DEFINE_FAST_GETFIELD(jchar, char, Char)
2781 DEFINE_FAST_GETFIELD(jshort, short, Short)
2782 DEFINE_FAST_GETFIELD(jint, int, Int)
2783 DEFINE_FAST_GETFIELD(jlong, long, Long)
2784 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2785 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2786
2787 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2788 switch (type) {
2789 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2790 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2791 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2792 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2793 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2794 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2795 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2796 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2797 default: ShouldNotReachHere();
2798 }
2799 return (address)-1;
2800 }
2801 #endif
2802
2803 // Virtual Memory
2804
2805 int os::vm_page_size() { return os::win32::vm_page_size(); }
2806 int os::vm_allocation_granularity() {
2807 return os::win32::vm_allocation_granularity();
2808 }
2809
2810 // Windows large page support is available on Windows 2003. In order to use
2811 // large page memory, the administrator must first assign additional privilege
2812 // to the user:
2813 // + select Control Panel -> Administrative Tools -> Local Security Policy
2814 // + select Local Policies -> User Rights Assignment
2815 // + double click "Lock pages in memory", add users and/or groups
2816 // + reboot
2817 // Note the above steps are needed for administrator as well, as administrators
2818 // by default do not have the privilege to lock pages in memory.
2819 //
2820 // Note about Windows 2003: although the API supports committing large page
2821 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2822 // scenario, I found through experiment it only uses large page if the entire
2823 // memory region is reserved and committed in a single VirtualAlloc() call.
2824 // This makes Windows large page support more or less like Solaris ISM, in
2825 // that the entire heap must be committed upfront. This probably will change
2826 // in the future, if so the code below needs to be revisited.
2827
2828 #ifndef MEM_LARGE_PAGES
2829 #define MEM_LARGE_PAGES 0x20000000
2830 #endif
2831
2832 static HANDLE _hProcess;
2833 static HANDLE _hToken;
2834
2835 // Container for NUMA node list info
2836 class NUMANodeListHolder {
2837 private:
2838 int *_numa_used_node_list; // allocated below
2839 int _numa_used_node_count;
2840
2841 void free_node_list() {
2842 if (_numa_used_node_list != NULL) {
2843 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2844 }
2845 }
2846
2847 public:
2848 NUMANodeListHolder() {
2849 _numa_used_node_count = 0;
2850 _numa_used_node_list = NULL;
2851 // do rest of initialization in build routine (after function pointers are set up)
2852 }
2853
2854 ~NUMANodeListHolder() {
2855 free_node_list();
2856 }
2857
2858 bool build() {
2859 DWORD_PTR proc_aff_mask;
2860 DWORD_PTR sys_aff_mask;
2861 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2862 ULONG highest_node_number;
2863 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2864 free_node_list();
2865 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2866 for (unsigned int i = 0; i <= highest_node_number; i++) {
2867 ULONGLONG proc_mask_numa_node;
2868 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2869 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2870 _numa_used_node_list[_numa_used_node_count++] = i;
2871 }
2872 }
2873 return (_numa_used_node_count > 1);
2874 }
2875
2876 int get_count() { return _numa_used_node_count; }
2877 int get_node_list_entry(int n) {
2878 // for indexes out of range, returns -1
2879 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2880 }
2881
2882 } numa_node_list_holder;
2883
2884
2885
2886 static size_t _large_page_size = 0;
2887
2888 static bool request_lock_memory_privilege() {
2889 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2890 os::current_process_id());
2891
2892 LUID luid;
2893 if (_hProcess != NULL &&
2894 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2895 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2896
2897 TOKEN_PRIVILEGES tp;
2898 tp.PrivilegeCount = 1;
2899 tp.Privileges[0].Luid = luid;
2900 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2901
2902 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2903 // privilege. Check GetLastError() too. See MSDN document.
2904 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2905 (GetLastError() == ERROR_SUCCESS)) {
2906 return true;
2907 }
2908 }
2909
2910 return false;
2911 }
2912
2913 static void cleanup_after_large_page_init() {
2914 if (_hProcess) CloseHandle(_hProcess);
2915 _hProcess = NULL;
2916 if (_hToken) CloseHandle(_hToken);
2917 _hToken = NULL;
2918 }
2919
2920 static bool numa_interleaving_init() {
2921 bool success = false;
2922 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2923
2924 // print a warning if UseNUMAInterleaving flag is specified on command line
2925 bool warn_on_failure = use_numa_interleaving_specified;
2926 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2927
2928 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2929 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2930 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2931
2932 if (numa_node_list_holder.build()) {
2933 if (log_is_enabled(Debug, os, cpu)) {
2934 Log(os, cpu) log;
2935 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2936 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2937 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2938 }
2939 }
2940 success = true;
2941 } else {
2942 WARN("Process does not cover multiple NUMA nodes.");
2943 }
2944 if (!success) {
2945 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2946 }
2947 return success;
2948 #undef WARN
2949 }
2950
2951 // this routine is used whenever we need to reserve a contiguous VA range
2952 // but we need to make separate VirtualAlloc calls for each piece of the range
2953 // Reasons for doing this:
2954 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2955 // * UseNUMAInterleaving requires a separate node for each piece
2956 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2957 DWORD prot,
2958 bool should_inject_error = false) {
2959 char * p_buf;
2960 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2961 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2962 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2963
2964 // first reserve enough address space in advance since we want to be
2965 // able to break a single contiguous virtual address range into multiple
2966 // large page commits but WS2003 does not allow reserving large page space
2967 // so we just use 4K pages for reserve, this gives us a legal contiguous
2968 // address space. then we will deallocate that reservation, and re alloc
2969 // using large pages
2970 const size_t size_of_reserve = bytes + chunk_size;
2971 if (bytes > size_of_reserve) {
2972 // Overflowed.
2973 return NULL;
2974 }
2975 p_buf = (char *) VirtualAlloc(addr,
2976 size_of_reserve, // size of Reserve
2977 MEM_RESERVE,
2978 PAGE_READWRITE);
2979 // If reservation failed, return NULL
2980 if (p_buf == NULL) return NULL;
2981 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2982 os::release_memory(p_buf, bytes + chunk_size);
2983
2984 // we still need to round up to a page boundary (in case we are using large pages)
2985 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2986 // instead we handle this in the bytes_to_rq computation below
2987 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2988
2989 // now go through and allocate one chunk at a time until all bytes are
2990 // allocated
2991 size_t bytes_remaining = bytes;
2992 // An overflow of align_size_up() would have been caught above
2993 // in the calculation of size_of_reserve.
2994 char * next_alloc_addr = p_buf;
2995 HANDLE hProc = GetCurrentProcess();
2996
2997 #ifdef ASSERT
2998 // Variable for the failure injection
2999 long ran_num = os::random();
3000 size_t fail_after = ran_num % bytes;
3001 #endif
3002
3003 int count=0;
3004 while (bytes_remaining) {
3005 // select bytes_to_rq to get to the next chunk_size boundary
3006
3007 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3008 // Note allocate and commit
3009 char * p_new;
3010
3011 #ifdef ASSERT
3012 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3013 #else
3014 const bool inject_error_now = false;
3015 #endif
3016
3017 if (inject_error_now) {
3018 p_new = NULL;
3019 } else {
3020 if (!UseNUMAInterleaving) {
3021 p_new = (char *) VirtualAlloc(next_alloc_addr,
3022 bytes_to_rq,
3023 flags,
3024 prot);
3025 } else {
3026 // get the next node to use from the used_node_list
3027 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3028 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3029 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
3030 }
3031 }
3032
3033 if (p_new == NULL) {
3034 // Free any allocated pages
3035 if (next_alloc_addr > p_buf) {
3036 // Some memory was committed so release it.
3037 size_t bytes_to_release = bytes - bytes_remaining;
3038 // NMT has yet to record any individual blocks, so it
3039 // need to create a dummy 'reserve' record to match
3040 // the release.
3041 MemTracker::record_virtual_memory_reserve((address)p_buf,
3042 bytes_to_release, CALLER_PC);
3043 os::release_memory(p_buf, bytes_to_release);
3044 }
3045 #ifdef ASSERT
3046 if (should_inject_error) {
3047 log_develop_debug(pagesize)("Reserving pages individually failed.");
3048 }
3049 #endif
3050 return NULL;
3051 }
3052
3053 bytes_remaining -= bytes_to_rq;
3054 next_alloc_addr += bytes_to_rq;
3055 count++;
3056 }
3057 // Although the memory is allocated individually, it is returned as one.
3058 // NMT records it as one block.
3059 if ((flags & MEM_COMMIT) != 0) {
3060 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3061 } else {
3062 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3063 }
3064
3065 // made it this far, success
3066 return p_buf;
3067 }
3068
3069
3070
3071 void os::large_page_init() {
3072 if (!UseLargePages) return;
3073
3074 // print a warning if any large page related flag is specified on command line
3075 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3076 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3077 bool success = false;
3078
3079 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3080 if (request_lock_memory_privilege()) {
3081 size_t s = GetLargePageMinimum();
3082 if (s) {
3083 #if defined(IA32) || defined(AMD64)
3084 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3085 WARN("JVM cannot use large pages bigger than 4mb.");
3086 } else {
3087 #endif
3088 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3089 _large_page_size = LargePageSizeInBytes;
3090 } else {
3091 _large_page_size = s;
3092 }
3093 success = true;
3094 #if defined(IA32) || defined(AMD64)
3095 }
3096 #endif
3097 } else {
3098 WARN("Large page is not supported by the processor.");
3099 }
3100 } else {
3101 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3102 }
3103 #undef WARN
3104
3105 const size_t default_page_size = (size_t) vm_page_size();
3106 if (success && _large_page_size > default_page_size) {
3107 _page_sizes[0] = _large_page_size;
3108 _page_sizes[1] = default_page_size;
3109 _page_sizes[2] = 0;
3110 }
3111
3112 cleanup_after_large_page_init();
3113 UseLargePages = success;
3114 }
3115
3116 // Helper function to create a temp file in the given directory
3117 int os::create_file_for_heap(const char* dir, size_t size) {
3118
3119 const char name_template[] = "/jvmheap.XXXXXX";
3120
3121 char *fullname = (char*)_alloca(strlen(dir) + sizeof(name_template));
3122 (void)strcpy(fullname, dir);
3123 (void)strcat(fullname, name_template);
3124 os::native_path(fullname);
3125
3126 char *path = _mktemp(fullname);
3127 if (path == NULL) {
3128 return -1;
3129 }
3130
3131 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3132
3133 if (fd < 0) {
3134 warning("Failure to create file %s for heap", path);
3135 return -1;
3136 }
3137
3138 return fd;
3139 }
3140
3141 // if 'base' is not NULL, function will return NULL if it cannot get 'base'
3142 //
3143 char* os::map_memory_to_dax_file(char* base, size_t size, int fd) {
3144 assert(fd != -1, "File descriptor is not valid");
3145
3146 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3147 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3148 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3149 if (fileMapping == NULL) {
3150 if (GetLastError() == ERROR_DISK_FULL) {
3151 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for heap"));
3152 } else {
3153 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3154 }
3155
3156 return NULL;
3157 }
3158
3159 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3160
3161 CloseHandle(fileMapping);
3162
3163 return (char*)addr;
3164 }
3165
3166 char* os::replace_existing_mapping_with_dax_file_mapping(char* base, size_t size, int fd) {
3167 assert(fd != -1, "File descriptor is not valid");
3168 assert(base != NULL, "base cannot be NULL");
3169
3170 release_memory(base, size);
3171 return map_memory_to_dax_file(base, size, fd);
3172
3173 }
3174
3175 // On win32, one cannot release just a part of reserved memory, it's an
3176 // all or nothing deal. When we split a reservation, we must break the
3177 // reservation into two reservations.
3178 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3179 bool realloc) {
3180 if (size > 0) {
3181 release_memory(base, size);
3182 if (realloc) {
3183 reserve_memory(split, base);
3184 }
3185 if (size != split) {
3186 reserve_memory(size - split, base + split);
3187 }
3188 }
3189 }
3190
3191 char* os::attempt_reserve_memory_at(size_t bytes, char* addr, int file_desc) {
3192 char* result = NULL;
3193 if (file_desc != -1) {
3194 result = map_memory_to_dax_file(addr, bytes, file_desc);
3195 if (result != NULL) {
3196 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC);
3197 }
3198 } else {
3199 result = pd_attempt_reserve_memory_at(bytes, addr);
3200 if (result != NULL) {
3201 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC);
3202 }
3203 }
3204 return result;
3205 }
3206
3207 // Multiple threads can race in this code but it's not possible to unmap small sections of
3208 // virtual space to get requested alignment, like posix-like os's.
3209 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3210 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3211 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3212 "Alignment must be a multiple of allocation granularity (page size)");
3213 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3214
3215 size_t extra_size = size + alignment;
3216 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3217
3218 char* aligned_base = NULL;
3219
3220 do {
3221 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3222 if (extra_base == NULL) {
3223 return NULL;
3224 }
3225 // Do manual alignment
3226 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3227
3228 if (file_desc != -1) {
3229 os::unmap_memory(extra_base, extra_size);
3230 }
3231 else {
3232 os::release_memory(extra_base, extra_size);
3233 }
3234
3235 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3236
3237 } while (aligned_base == NULL);
3238
3239 return aligned_base;
3240 }
3241
3242 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3243 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3244 "reserve alignment");
3245 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3246 char* res;
3247 // note that if UseLargePages is on, all the areas that require interleaving
3248 // will go thru reserve_memory_special rather than thru here.
3249 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3250 if (!use_individual) {
3251 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3252 } else {
3253 elapsedTimer reserveTimer;
3254 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3255 // in numa interleaving, we have to allocate pages individually
3256 // (well really chunks of NUMAInterleaveGranularity size)
3257 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3258 if (res == NULL) {
3259 warning("NUMA page allocation failed");
3260 }
3261 if (Verbose && PrintMiscellaneous) {
3262 reserveTimer.stop();
3263 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3264 reserveTimer.milliseconds(), reserveTimer.ticks());
3265 }
3266 }
3267 assert(res == NULL || addr == NULL || addr == res,
3268 "Unexpected address from reserve.");
3269
3270 return res;
3271 }
3272
3273 // Reserve memory at an arbitrary address, only if that area is
3274 // available (and not reserved for something else).
3275 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3276 // Windows os::reserve_memory() fails of the requested address range is
3277 // not avilable.
3278 return reserve_memory(bytes, requested_addr, 0);
3279 }
3280
3281 size_t os::large_page_size() {
3282 return _large_page_size;
3283 }
3284
3285 bool os::can_commit_large_page_memory() {
3286 // Windows only uses large page memory when the entire region is reserved
3287 // and committed in a single VirtualAlloc() call. This may change in the
3288 // future, but with Windows 2003 it's not possible to commit on demand.
3289 return false;
3290 }
3291
3292 bool os::can_execute_large_page_memory() {
3293 return true;
3294 }
3295
3296 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3297 bool exec) {
3298 assert(UseLargePages, "only for large pages");
3299
3300 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3301 return NULL; // Fallback to small pages.
3302 }
3303
3304 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3305 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3306
3307 // with large pages, there are two cases where we need to use Individual Allocation
3308 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3309 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3310 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3311 log_debug(pagesize)("Reserving large pages individually.");
3312
3313 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3314 if (p_buf == NULL) {
3315 // give an appropriate warning message
3316 if (UseNUMAInterleaving) {
3317 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3318 }
3319 if (UseLargePagesIndividualAllocation) {
3320 warning("Individually allocated large pages failed, "
3321 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3322 }
3323 return NULL;
3324 }
3325
3326 return p_buf;
3327
3328 } else {
3329 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3330
3331 // normal policy just allocate it all at once
3332 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3333 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3334 if (res != NULL) {
3335 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3336 }
3337
3338 return res;
3339 }
3340 }
3341
3342 bool os::release_memory_special(char* base, size_t bytes) {
3343 assert(base != NULL, "Sanity check");
3344 return release_memory(base, bytes);
3345 }
3346
3347 void os::print_statistics() {
3348 }
3349
3350 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3351 int err = os::get_last_error();
3352 char buf[256];
3353 size_t buf_len = os::lasterror(buf, sizeof(buf));
3354 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3355 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3356 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3357 }
3358
3359 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3360 if (bytes == 0) {
3361 // Don't bother the OS with noops.
3362 return true;
3363 }
3364 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3365 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3366 // Don't attempt to print anything if the OS call fails. We're
3367 // probably low on resources, so the print itself may cause crashes.
3368
3369 // unless we have NUMAInterleaving enabled, the range of a commit
3370 // is always within a reserve covered by a single VirtualAlloc
3371 // in that case we can just do a single commit for the requested size
3372 if (!UseNUMAInterleaving) {
3373 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3374 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3375 return false;
3376 }
3377 if (exec) {
3378 DWORD oldprot;
3379 // Windows doc says to use VirtualProtect to get execute permissions
3380 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3381 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3382 return false;
3383 }
3384 }
3385 return true;
3386 } else {
3387
3388 // when NUMAInterleaving is enabled, the commit might cover a range that
3389 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3390 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3391 // returns represents the number of bytes that can be committed in one step.
3392 size_t bytes_remaining = bytes;
3393 char * next_alloc_addr = addr;
3394 while (bytes_remaining > 0) {
3395 MEMORY_BASIC_INFORMATION alloc_info;
3396 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3397 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3398 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3399 PAGE_READWRITE) == NULL) {
3400 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3401 exec);)
3402 return false;
3403 }
3404 if (exec) {
3405 DWORD oldprot;
3406 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3407 PAGE_EXECUTE_READWRITE, &oldprot)) {
3408 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3409 exec);)
3410 return false;
3411 }
3412 }
3413 bytes_remaining -= bytes_to_rq;
3414 next_alloc_addr += bytes_to_rq;
3415 }
3416 }
3417 // if we made it this far, return true
3418 return true;
3419 }
3420
3421 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3422 bool exec) {
3423 // alignment_hint is ignored on this OS
3424 return pd_commit_memory(addr, size, exec);
3425 }
3426
3427 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3428 const char* mesg) {
3429 assert(mesg != NULL, "mesg must be specified");
3430 if (!pd_commit_memory(addr, size, exec)) {
3431 warn_fail_commit_memory(addr, size, exec);
3432 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3433 }
3434 }
3435
3436 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3437 size_t alignment_hint, bool exec,
3438 const char* mesg) {
3439 // alignment_hint is ignored on this OS
3440 pd_commit_memory_or_exit(addr, size, exec, mesg);
3441 }
3442
3443 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3444 if (bytes == 0) {
3445 // Don't bother the OS with noops.
3446 return true;
3447 }
3448 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3449 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3450 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3451 }
3452
3453 bool os::pd_release_memory(char* addr, size_t bytes) {
3454 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3455 }
3456
3457 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3458 return os::commit_memory(addr, size, !ExecMem);
3459 }
3460
3461 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3462 return os::uncommit_memory(addr, size);
3463 }
3464
3465 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3466 uint count = 0;
3467 bool ret = false;
3468 size_t bytes_remaining = bytes;
3469 char * next_protect_addr = addr;
3470
3471 // Use VirtualQuery() to get the chunk size.
3472 while (bytes_remaining) {
3473 MEMORY_BASIC_INFORMATION alloc_info;
3474 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3475 return false;
3476 }
3477
3478 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3479 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3480 // but we don't distinguish here as both cases are protected by same API.
3481 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3482 warning("Failed protecting pages individually for chunk #%u", count);
3483 if (!ret) {
3484 return false;
3485 }
3486
3487 bytes_remaining -= bytes_to_protect;
3488 next_protect_addr += bytes_to_protect;
3489 count++;
3490 }
3491 return ret;
3492 }
3493
3494 // Set protections specified
3495 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3496 bool is_committed) {
3497 unsigned int p = 0;
3498 switch (prot) {
3499 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3500 case MEM_PROT_READ: p = PAGE_READONLY; break;
3501 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3502 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3503 default:
3504 ShouldNotReachHere();
3505 }
3506
3507 DWORD old_status;
3508
3509 // Strange enough, but on Win32 one can change protection only for committed
3510 // memory, not a big deal anyway, as bytes less or equal than 64K
3511 if (!is_committed) {
3512 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3513 "cannot commit protection page");
3514 }
3515 // One cannot use os::guard_memory() here, as on Win32 guard page
3516 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3517 //
3518 // Pages in the region become guard pages. Any attempt to access a guard page
3519 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3520 // the guard page status. Guard pages thus act as a one-time access alarm.
3521 bool ret;
3522 if (UseNUMAInterleaving) {
3523 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3524 // so we must protect the chunks individually.
3525 ret = protect_pages_individually(addr, bytes, p, &old_status);
3526 } else {
3527 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3528 }
3529 #ifdef ASSERT
3530 if (!ret) {
3531 int err = os::get_last_error();
3532 char buf[256];
3533 size_t buf_len = os::lasterror(buf, sizeof(buf));
3534 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3535 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3536 buf_len != 0 ? buf : "<no_error_string>", err);
3537 }
3538 #endif
3539 return ret;
3540 }
3541
3542 bool os::guard_memory(char* addr, size_t bytes) {
3543 DWORD old_status;
3544 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3545 }
3546
3547 bool os::unguard_memory(char* addr, size_t bytes) {
3548 DWORD old_status;
3549 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3550 }
3551
3552 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3553 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3554 void os::numa_make_global(char *addr, size_t bytes) { }
3555 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3556 bool os::numa_topology_changed() { return false; }
3557 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3558 int os::numa_get_group_id() { return 0; }
3559 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3560 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3561 // Provide an answer for UMA systems
3562 ids[0] = 0;
3563 return 1;
3564 } else {
3565 // check for size bigger than actual groups_num
3566 size = MIN2(size, numa_get_groups_num());
3567 for (int i = 0; i < (int)size; i++) {
3568 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3569 }
3570 return size;
3571 }
3572 }
3573
3574 bool os::get_page_info(char *start, page_info* info) {
3575 return false;
3576 }
3577
3578 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3579 page_info* page_found) {
3580 return end;
3581 }
3582
3583 char* os::non_memory_address_word() {
3584 // Must never look like an address returned by reserve_memory,
3585 // even in its subfields (as defined by the CPU immediate fields,
3586 // if the CPU splits constants across multiple instructions).
3587 return (char*)-1;
3588 }
3589
3590 #define MAX_ERROR_COUNT 100
3591 #define SYS_THREAD_ERROR 0xffffffffUL
3592
3593 void os::pd_start_thread(Thread* thread) {
3594 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3595 // Returns previous suspend state:
3596 // 0: Thread was not suspended
3597 // 1: Thread is running now
3598 // >1: Thread is still suspended.
3599 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3600 }
3601
3602 class HighResolutionInterval : public CHeapObj<mtThread> {
3603 // The default timer resolution seems to be 10 milliseconds.
3604 // (Where is this written down?)
3605 // If someone wants to sleep for only a fraction of the default,
3606 // then we set the timer resolution down to 1 millisecond for
3607 // the duration of their interval.
3608 // We carefully set the resolution back, since otherwise we
3609 // seem to incur an overhead (3%?) that we don't need.
3610 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3611 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3612 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3613 // timeBeginPeriod() if the relative error exceeded some threshold.
3614 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3615 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3616 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3617 // resolution timers running.
3618 private:
3619 jlong resolution;
3620 public:
3621 HighResolutionInterval(jlong ms) {
3622 resolution = ms % 10L;
3623 if (resolution != 0) {
3624 MMRESULT result = timeBeginPeriod(1L);
3625 }
3626 }
3627 ~HighResolutionInterval() {
3628 if (resolution != 0) {
3629 MMRESULT result = timeEndPeriod(1L);
3630 }
3631 resolution = 0L;
3632 }
3633 };
3634
3635 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3636 jlong limit = (jlong) MAXDWORD;
3637
3638 while (ms > limit) {
3639 int res;
3640 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3641 return res;
3642 }
3643 ms -= limit;
3644 }
3645
3646 assert(thread == Thread::current(), "thread consistency check");
3647 OSThread* osthread = thread->osthread();
3648 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3649 int result;
3650 if (interruptable) {
3651 assert(thread->is_Java_thread(), "must be java thread");
3652 JavaThread *jt = (JavaThread *) thread;
3653 ThreadBlockInVM tbivm(jt);
3654
3655 jt->set_suspend_equivalent();
3656 // cleared by handle_special_suspend_equivalent_condition() or
3657 // java_suspend_self() via check_and_wait_while_suspended()
3658
3659 HANDLE events[1];
3660 events[0] = osthread->interrupt_event();
3661 HighResolutionInterval *phri=NULL;
3662 if (!ForceTimeHighResolution) {
3663 phri = new HighResolutionInterval(ms);
3664 }
3665 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3666 result = OS_TIMEOUT;
3667 } else {
3668 ResetEvent(osthread->interrupt_event());
3669 osthread->set_interrupted(false);
3670 result = OS_INTRPT;
3671 }
3672 delete phri; //if it is NULL, harmless
3673
3674 // were we externally suspended while we were waiting?
3675 jt->check_and_wait_while_suspended();
3676 } else {
3677 assert(!thread->is_Java_thread(), "must not be java thread");
3678 Sleep((long) ms);
3679 result = OS_TIMEOUT;
3680 }
3681 return result;
3682 }
3683
3684 // Short sleep, direct OS call.
3685 //
3686 // ms = 0, means allow others (if any) to run.
3687 //
3688 void os::naked_short_sleep(jlong ms) {
3689 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3690 Sleep(ms);
3691 }
3692
3693 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3694 void os::infinite_sleep() {
3695 while (true) { // sleep forever ...
3696 Sleep(100000); // ... 100 seconds at a time
3697 }
3698 }
3699
3700 typedef BOOL (WINAPI * STTSignature)(void);
3701
3702 void os::naked_yield() {
3703 // Consider passing back the return value from SwitchToThread().
3704 SwitchToThread();
3705 }
3706
3707 // Win32 only gives you access to seven real priorities at a time,
3708 // so we compress Java's ten down to seven. It would be better
3709 // if we dynamically adjusted relative priorities.
3710
3711 int os::java_to_os_priority[CriticalPriority + 1] = {
3712 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3713 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3714 THREAD_PRIORITY_LOWEST, // 2
3715 THREAD_PRIORITY_BELOW_NORMAL, // 3
3716 THREAD_PRIORITY_BELOW_NORMAL, // 4
3717 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3718 THREAD_PRIORITY_NORMAL, // 6
3719 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3720 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3721 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3722 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3723 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3724 };
3725
3726 int prio_policy1[CriticalPriority + 1] = {
3727 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3728 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3729 THREAD_PRIORITY_LOWEST, // 2
3730 THREAD_PRIORITY_BELOW_NORMAL, // 3
3731 THREAD_PRIORITY_BELOW_NORMAL, // 4
3732 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3733 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3734 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3735 THREAD_PRIORITY_HIGHEST, // 8
3736 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3737 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3738 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3739 };
3740
3741 static int prio_init() {
3742 // If ThreadPriorityPolicy is 1, switch tables
3743 if (ThreadPriorityPolicy == 1) {
3744 int i;
3745 for (i = 0; i < CriticalPriority + 1; i++) {
3746 os::java_to_os_priority[i] = prio_policy1[i];
3747 }
3748 }
3749 if (UseCriticalJavaThreadPriority) {
3750 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3751 }
3752 return 0;
3753 }
3754
3755 OSReturn os::set_native_priority(Thread* thread, int priority) {
3756 if (!UseThreadPriorities) return OS_OK;
3757 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3758 return ret ? OS_OK : OS_ERR;
3759 }
3760
3761 OSReturn os::get_native_priority(const Thread* const thread,
3762 int* priority_ptr) {
3763 if (!UseThreadPriorities) {
3764 *priority_ptr = java_to_os_priority[NormPriority];
3765 return OS_OK;
3766 }
3767 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3768 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3769 assert(false, "GetThreadPriority failed");
3770 return OS_ERR;
3771 }
3772 *priority_ptr = os_prio;
3773 return OS_OK;
3774 }
3775
3776
3777 // Hint to the underlying OS that a task switch would not be good.
3778 // Void return because it's a hint and can fail.
3779 void os::hint_no_preempt() {}
3780
3781 void os::interrupt(Thread* thread) {
3782 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3783 Threads_lock->owned_by_self(),
3784 "possibility of dangling Thread pointer");
3785
3786 OSThread* osthread = thread->osthread();
3787 osthread->set_interrupted(true);
3788 // More than one thread can get here with the same value of osthread,
3789 // resulting in multiple notifications. We do, however, want the store
3790 // to interrupted() to be visible to other threads before we post
3791 // the interrupt event.
3792 OrderAccess::release();
3793 SetEvent(osthread->interrupt_event());
3794 // For JSR166: unpark after setting status
3795 if (thread->is_Java_thread()) {
3796 ((JavaThread*)thread)->parker()->unpark();
3797 }
3798
3799 ParkEvent * ev = thread->_ParkEvent;
3800 if (ev != NULL) ev->unpark();
3801 }
3802
3803
3804 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3805 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3806 "possibility of dangling Thread pointer");
3807
3808 OSThread* osthread = thread->osthread();
3809 // There is no synchronization between the setting of the interrupt
3810 // and it being cleared here. It is critical - see 6535709 - that
3811 // we only clear the interrupt state, and reset the interrupt event,
3812 // if we are going to report that we were indeed interrupted - else
3813 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3814 // depending on the timing. By checking thread interrupt event to see
3815 // if the thread gets real interrupt thus prevent spurious wakeup.
3816 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3817 if (interrupted && clear_interrupted) {
3818 osthread->set_interrupted(false);
3819 ResetEvent(osthread->interrupt_event());
3820 } // Otherwise leave the interrupted state alone
3821
3822 return interrupted;
3823 }
3824
3825 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3826 ExtendedPC os::get_thread_pc(Thread* thread) {
3827 CONTEXT context;
3828 context.ContextFlags = CONTEXT_CONTROL;
3829 HANDLE handle = thread->osthread()->thread_handle();
3830 #ifdef _M_IA64
3831 assert(0, "Fix get_thread_pc");
3832 return ExtendedPC(NULL);
3833 #else
3834 if (GetThreadContext(handle, &context)) {
3835 #ifdef _M_AMD64
3836 return ExtendedPC((address) context.Rip);
3837 #else
3838 return ExtendedPC((address) context.Eip);
3839 #endif
3840 } else {
3841 return ExtendedPC(NULL);
3842 }
3843 #endif
3844 }
3845
3846 // GetCurrentThreadId() returns DWORD
3847 intx os::current_thread_id() { return GetCurrentThreadId(); }
3848
3849 static int _initial_pid = 0;
3850
3851 int os::current_process_id() {
3852 return (_initial_pid ? _initial_pid : _getpid());
3853 }
3854
3855 int os::win32::_vm_page_size = 0;
3856 int os::win32::_vm_allocation_granularity = 0;
3857 int os::win32::_processor_type = 0;
3858 // Processor level is not available on non-NT systems, use vm_version instead
3859 int os::win32::_processor_level = 0;
3860 julong os::win32::_physical_memory = 0;
3861 size_t os::win32::_default_stack_size = 0;
3862
3863 intx os::win32::_os_thread_limit = 0;
3864 volatile intx os::win32::_os_thread_count = 0;
3865
3866 bool os::win32::_is_windows_server = false;
3867
3868 // 6573254
3869 // Currently, the bug is observed across all the supported Windows releases,
3870 // including the latest one (as of this writing - Windows Server 2012 R2)
3871 bool os::win32::_has_exit_bug = true;
3872
3873 void os::win32::initialize_system_info() {
3874 SYSTEM_INFO si;
3875 GetSystemInfo(&si);
3876 _vm_page_size = si.dwPageSize;
3877 _vm_allocation_granularity = si.dwAllocationGranularity;
3878 _processor_type = si.dwProcessorType;
3879 _processor_level = si.wProcessorLevel;
3880 set_processor_count(si.dwNumberOfProcessors);
3881
3882 MEMORYSTATUSEX ms;
3883 ms.dwLength = sizeof(ms);
3884
3885 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3886 // dwMemoryLoad (% of memory in use)
3887 GlobalMemoryStatusEx(&ms);
3888 _physical_memory = ms.ullTotalPhys;
3889
3890 if (FLAG_IS_DEFAULT(MaxRAM)) {
3891 // Adjust MaxRAM according to the maximum virtual address space available.
3892 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3893 }
3894
3895 OSVERSIONINFOEX oi;
3896 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3897 GetVersionEx((OSVERSIONINFO*)&oi);
3898 switch (oi.dwPlatformId) {
3899 case VER_PLATFORM_WIN32_NT:
3900 {
3901 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3902 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3903 oi.wProductType == VER_NT_SERVER) {
3904 _is_windows_server = true;
3905 }
3906 }
3907 break;
3908 default: fatal("Unknown platform");
3909 }
3910
3911 _default_stack_size = os::current_stack_size();
3912 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3913 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3914 "stack size not a multiple of page size");
3915
3916 initialize_performance_counter();
3917 }
3918
3919
3920 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3921 int ebuflen) {
3922 char path[MAX_PATH];
3923 DWORD size;
3924 DWORD pathLen = (DWORD)sizeof(path);
3925 HINSTANCE result = NULL;
3926
3927 // only allow library name without path component
3928 assert(strchr(name, '\\') == NULL, "path not allowed");
3929 assert(strchr(name, ':') == NULL, "path not allowed");
3930 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3931 jio_snprintf(ebuf, ebuflen,
3932 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3933 return NULL;
3934 }
3935
3936 // search system directory
3937 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3938 if (size >= pathLen) {
3939 return NULL; // truncated
3940 }
3941 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3942 return NULL; // truncated
3943 }
3944 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3945 return result;
3946 }
3947 }
3948
3949 // try Windows directory
3950 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3951 if (size >= pathLen) {
3952 return NULL; // truncated
3953 }
3954 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3955 return NULL; // truncated
3956 }
3957 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3958 return result;
3959 }
3960 }
3961
3962 jio_snprintf(ebuf, ebuflen,
3963 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3964 return NULL;
3965 }
3966
3967 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3968 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3969
3970 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3971 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3972 return TRUE;
3973 }
3974
3975 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3976 // Basic approach:
3977 // - Each exiting thread registers its intent to exit and then does so.
3978 // - A thread trying to terminate the process must wait for all
3979 // threads currently exiting to complete their exit.
3980
3981 if (os::win32::has_exit_bug()) {
3982 // The array holds handles of the threads that have started exiting by calling
3983 // _endthreadex().
3984 // Should be large enough to avoid blocking the exiting thread due to lack of
3985 // a free slot.
3986 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3987 static int handle_count = 0;
3988
3989 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3990 static CRITICAL_SECTION crit_sect;
3991 static volatile jint process_exiting = 0;
3992 int i, j;
3993 DWORD res;
3994 HANDLE hproc, hthr;
3995
3996 // We only attempt to register threads until a process exiting
3997 // thread manages to set the process_exiting flag. Any threads
3998 // that come through here after the process_exiting flag is set
3999 // are unregistered and will be caught in the SuspendThread()
4000 // infinite loop below.
4001 bool registered = false;
4002
4003 // The first thread that reached this point, initializes the critical section.
4004 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
4005 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
4006 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
4007 if (what != EPT_THREAD) {
4008 // Atomically set process_exiting before the critical section
4009 // to increase the visibility between racing threads.
4010 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
4011 }
4012 EnterCriticalSection(&crit_sect);
4013
4014 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
4015 // Remove from the array those handles of the threads that have completed exiting.
4016 for (i = 0, j = 0; i < handle_count; ++i) {
4017 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
4018 if (res == WAIT_TIMEOUT) {
4019 handles[j++] = handles[i];
4020 } else {
4021 if (res == WAIT_FAILED) {
4022 warning("WaitForSingleObject failed (%u) in %s: %d\n",
4023 GetLastError(), __FILE__, __LINE__);
4024 }
4025 // Don't keep the handle, if we failed waiting for it.
4026 CloseHandle(handles[i]);
4027 }
4028 }
4029
4030 // If there's no free slot in the array of the kept handles, we'll have to
4031 // wait until at least one thread completes exiting.
4032 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
4033 // Raise the priority of the oldest exiting thread to increase its chances
4034 // to complete sooner.
4035 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
4036 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
4037 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
4038 i = (res - WAIT_OBJECT_0);
4039 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
4040 for (; i < handle_count; ++i) {
4041 handles[i] = handles[i + 1];
4042 }
4043 } else {
4044 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4045 (res == WAIT_FAILED ? "failed" : "timed out"),
4046 GetLastError(), __FILE__, __LINE__);
4047 // Don't keep handles, if we failed waiting for them.
4048 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
4049 CloseHandle(handles[i]);
4050 }
4051 handle_count = 0;
4052 }
4053 }
4054
4055 // Store a duplicate of the current thread handle in the array of handles.
4056 hproc = GetCurrentProcess();
4057 hthr = GetCurrentThread();
4058 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
4059 0, FALSE, DUPLICATE_SAME_ACCESS)) {
4060 warning("DuplicateHandle failed (%u) in %s: %d\n",
4061 GetLastError(), __FILE__, __LINE__);
4062
4063 // We can't register this thread (no more handles) so this thread
4064 // may be racing with a thread that is calling exit(). If the thread
4065 // that is calling exit() has managed to set the process_exiting
4066 // flag, then this thread will be caught in the SuspendThread()
4067 // infinite loop below which closes that race. A small timing
4068 // window remains before the process_exiting flag is set, but it
4069 // is only exposed when we are out of handles.
4070 } else {
4071 ++handle_count;
4072 registered = true;
4073
4074 // The current exiting thread has stored its handle in the array, and now
4075 // should leave the critical section before calling _endthreadex().
4076 }
4077
4078 } else if (what != EPT_THREAD && handle_count > 0) {
4079 jlong start_time, finish_time, timeout_left;
4080 // Before ending the process, make sure all the threads that had called
4081 // _endthreadex() completed.
4082
4083 // Set the priority level of the current thread to the same value as
4084 // the priority level of exiting threads.
4085 // This is to ensure it will be given a fair chance to execute if
4086 // the timeout expires.
4087 hthr = GetCurrentThread();
4088 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
4089 start_time = os::javaTimeNanos();
4090 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
4091 for (i = 0; ; ) {
4092 int portion_count = handle_count - i;
4093 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
4094 portion_count = MAXIMUM_WAIT_OBJECTS;
4095 }
4096 for (j = 0; j < portion_count; ++j) {
4097 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
4098 }
4099 timeout_left = (finish_time - start_time) / 1000000L;
4100 if (timeout_left < 0) {
4101 timeout_left = 0;
4102 }
4103 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
4104 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
4105 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
4106 (res == WAIT_FAILED ? "failed" : "timed out"),
4107 GetLastError(), __FILE__, __LINE__);
4108 // Reset portion_count so we close the remaining
4109 // handles due to this error.
4110 portion_count = handle_count - i;
4111 }
4112 for (j = 0; j < portion_count; ++j) {
4113 CloseHandle(handles[i + j]);
4114 }
4115 if ((i += portion_count) >= handle_count) {
4116 break;
4117 }
4118 start_time = os::javaTimeNanos();
4119 }
4120 handle_count = 0;
4121 }
4122
4123 LeaveCriticalSection(&crit_sect);
4124 }
4125
4126 if (!registered &&
4127 OrderAccess::load_acquire(&process_exiting) != 0 &&
4128 process_exiting != (jint)GetCurrentThreadId()) {
4129 // Some other thread is about to call exit(), so we don't let
4130 // the current unregistered thread proceed to exit() or _endthreadex()
4131 while (true) {
4132 SuspendThread(GetCurrentThread());
4133 // Avoid busy-wait loop, if SuspendThread() failed.
4134 Sleep(EXIT_TIMEOUT);
4135 }
4136 }
4137 }
4138
4139 // We are here if either
4140 // - there's no 'race at exit' bug on this OS release;
4141 // - initialization of the critical section failed (unlikely);
4142 // - the current thread has registered itself and left the critical section;
4143 // - the process-exiting thread has raised the flag and left the critical section.
4144 if (what == EPT_THREAD) {
4145 _endthreadex((unsigned)exit_code);
4146 } else if (what == EPT_PROCESS) {
4147 ::exit(exit_code);
4148 } else {
4149 _exit(exit_code);
4150 }
4151
4152 // Should not reach here
4153 return exit_code;
4154 }
4155
4156 #undef EXIT_TIMEOUT
4157
4158 void os::win32::setmode_streams() {
4159 _setmode(_fileno(stdin), _O_BINARY);
4160 _setmode(_fileno(stdout), _O_BINARY);
4161 _setmode(_fileno(stderr), _O_BINARY);
4162 }
4163
4164
4165 bool os::is_debugger_attached() {
4166 return IsDebuggerPresent() ? true : false;
4167 }
4168
4169
4170 void os::wait_for_keypress_at_exit(void) {
4171 if (PauseAtExit) {
4172 fprintf(stderr, "Press any key to continue...\n");
4173 fgetc(stdin);
4174 }
4175 }
4176
4177
4178 bool os::message_box(const char* title, const char* message) {
4179 int result = MessageBox(NULL, message, title,
4180 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4181 return result == IDYES;
4182 }
4183
4184 #ifndef PRODUCT
4185 #ifndef _WIN64
4186 // Helpers to check whether NX protection is enabled
4187 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4188 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4189 pex->ExceptionRecord->NumberParameters > 0 &&
4190 pex->ExceptionRecord->ExceptionInformation[0] ==
4191 EXCEPTION_INFO_EXEC_VIOLATION) {
4192 return EXCEPTION_EXECUTE_HANDLER;
4193 }
4194 return EXCEPTION_CONTINUE_SEARCH;
4195 }
4196
4197 void nx_check_protection() {
4198 // If NX is enabled we'll get an exception calling into code on the stack
4199 char code[] = { (char)0xC3 }; // ret
4200 void *code_ptr = (void *)code;
4201 __try {
4202 __asm call code_ptr
4203 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4204 tty->print_raw_cr("NX protection detected.");
4205 }
4206 }
4207 #endif // _WIN64
4208 #endif // PRODUCT
4209
4210 // This is called _before_ the global arguments have been parsed
4211 void os::init(void) {
4212 _initial_pid = _getpid();
4213
4214 init_random(1234567);
4215
4216 win32::initialize_system_info();
4217 win32::setmode_streams();
4218 init_page_sizes((size_t) win32::vm_page_size());
4219
4220 // This may be overridden later when argument processing is done.
4221 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4222
4223 // Initialize main_process and main_thread
4224 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4225 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4226 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4227 fatal("DuplicateHandle failed\n");
4228 }
4229 main_thread_id = (int) GetCurrentThreadId();
4230
4231 // initialize fast thread access - only used for 32-bit
4232 win32::initialize_thread_ptr_offset();
4233 }
4234
4235 // To install functions for atexit processing
4236 extern "C" {
4237 static void perfMemory_exit_helper() {
4238 perfMemory_exit();
4239 }
4240 }
4241
4242 static jint initSock();
4243
4244 // this is called _after_ the global arguments have been parsed
4245 jint os::init_2(void) {
4246 // Allocate a single page and mark it as readable for safepoint polling
4247 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4248 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4249
4250 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4251 guarantee(return_page != NULL, "Commit Failed for polling page");
4252
4253 os::set_polling_page(polling_page);
4254 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4255
4256 if (!UseMembar) {
4257 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4258 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4259
4260 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4261 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4262
4263 os::set_memory_serialize_page(mem_serialize_page);
4264 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4265 }
4266
4267 // Setup Windows Exceptions
4268
4269 // for debugging float code generation bugs
4270 if (ForceFloatExceptions) {
4271 #ifndef _WIN64
4272 static long fp_control_word = 0;
4273 __asm { fstcw fp_control_word }
4274 // see Intel PPro Manual, Vol. 2, p 7-16
4275 const long precision = 0x20;
4276 const long underflow = 0x10;
4277 const long overflow = 0x08;
4278 const long zero_div = 0x04;
4279 const long denorm = 0x02;
4280 const long invalid = 0x01;
4281 fp_control_word |= invalid;
4282 __asm { fldcw fp_control_word }
4283 #endif
4284 }
4285
4286 // If stack_commit_size is 0, windows will reserve the default size,
4287 // but only commit a small portion of it.
4288 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4289 size_t default_reserve_size = os::win32::default_stack_size();
4290 size_t actual_reserve_size = stack_commit_size;
4291 if (stack_commit_size < default_reserve_size) {
4292 // If stack_commit_size == 0, we want this too
4293 actual_reserve_size = default_reserve_size;
4294 }
4295
4296 // Check minimum allowable stack size for thread creation and to initialize
4297 // the java system classes, including StackOverflowError - depends on page
4298 // size. Add two 4K pages for compiler2 recursion in main thread.
4299 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4300 // class initialization depending on 32 or 64 bit VM.
4301 size_t min_stack_allowed =
4302 (size_t)(JavaThread::stack_guard_zone_size() +
4303 JavaThread::stack_shadow_zone_size() +
4304 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4305
4306 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size());
4307
4308 if (actual_reserve_size < min_stack_allowed) {
4309 tty->print_cr("\nThe Java thread stack size specified is too small. "
4310 "Specify at least %dk",
4311 min_stack_allowed / K);
4312 return JNI_ERR;
4313 }
4314
4315 JavaThread::set_stack_size_at_create(stack_commit_size);
4316
4317 // Calculate theoretical max. size of Threads to guard gainst artifical
4318 // out-of-memory situations, where all available address-space has been
4319 // reserved by thread stacks.
4320 assert(actual_reserve_size != 0, "Must have a stack");
4321
4322 // Calculate the thread limit when we should start doing Virtual Memory
4323 // banging. Currently when the threads will have used all but 200Mb of space.
4324 //
4325 // TODO: consider performing a similar calculation for commit size instead
4326 // as reserve size, since on a 64-bit platform we'll run into that more
4327 // often than running out of virtual memory space. We can use the
4328 // lower value of the two calculations as the os_thread_limit.
4329 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4330 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4331
4332 // at exit methods are called in the reverse order of their registration.
4333 // there is no limit to the number of functions registered. atexit does
4334 // not set errno.
4335
4336 if (PerfAllowAtExitRegistration) {
4337 // only register atexit functions if PerfAllowAtExitRegistration is set.
4338 // atexit functions can be delayed until process exit time, which
4339 // can be problematic for embedded VM situations. Embedded VMs should
4340 // call DestroyJavaVM() to assure that VM resources are released.
4341
4342 // note: perfMemory_exit_helper atexit function may be removed in
4343 // the future if the appropriate cleanup code can be added to the
4344 // VM_Exit VMOperation's doit method.
4345 if (atexit(perfMemory_exit_helper) != 0) {
4346 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4347 }
4348 }
4349
4350 #ifndef _WIN64
4351 // Print something if NX is enabled (win32 on AMD64)
4352 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4353 #endif
4354
4355 // initialize thread priority policy
4356 prio_init();
4357
4358 if (UseNUMA && !ForceNUMA) {
4359 UseNUMA = false; // We don't fully support this yet
4360 }
4361
4362 if (UseNUMAInterleaving) {
4363 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4364 bool success = numa_interleaving_init();
4365 if (!success) UseNUMAInterleaving = false;
4366 }
4367
4368 if (initSock() != JNI_OK) {
4369 return JNI_ERR;
4370 }
4371
4372 return JNI_OK;
4373 }
4374
4375 // Mark the polling page as unreadable
4376 void os::make_polling_page_unreadable(void) {
4377 DWORD old_status;
4378 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4379 PAGE_NOACCESS, &old_status)) {
4380 fatal("Could not disable polling page");
4381 }
4382 }
4383
4384 // Mark the polling page as readable
4385 void os::make_polling_page_readable(void) {
4386 DWORD old_status;
4387 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4388 PAGE_READONLY, &old_status)) {
4389 fatal("Could not enable polling page");
4390 }
4391 }
4392
4393
4394 int os::stat(const char *path, struct stat *sbuf) {
4395 char pathbuf[MAX_PATH];
4396 if (strlen(path) > MAX_PATH - 1) {
4397 errno = ENAMETOOLONG;
4398 return -1;
4399 }
4400 os::native_path(strcpy(pathbuf, path));
4401 int ret = ::stat(pathbuf, sbuf);
4402 if (sbuf != NULL && UseUTCFileTimestamp) {
4403 // Fix for 6539723. st_mtime returned from stat() is dependent on
4404 // the system timezone and so can return different values for the
4405 // same file if/when daylight savings time changes. This adjustment
4406 // makes sure the same timestamp is returned regardless of the TZ.
4407 //
4408 // See:
4409 // http://msdn.microsoft.com/library/
4410 // default.asp?url=/library/en-us/sysinfo/base/
4411 // time_zone_information_str.asp
4412 // and
4413 // http://msdn.microsoft.com/library/default.asp?url=
4414 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4415 //
4416 // NOTE: there is a insidious bug here: If the timezone is changed
4417 // after the call to stat() but before 'GetTimeZoneInformation()', then
4418 // the adjustment we do here will be wrong and we'll return the wrong
4419 // value (which will likely end up creating an invalid class data
4420 // archive). Absent a better API for this, or some time zone locking
4421 // mechanism, we'll have to live with this risk.
4422 TIME_ZONE_INFORMATION tz;
4423 DWORD tzid = GetTimeZoneInformation(&tz);
4424 int daylightBias =
4425 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4426 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4427 }
4428 return ret;
4429 }
4430
4431
4432 #define FT2INT64(ft) \
4433 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4434
4435
4436 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4437 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4438 // of a thread.
4439 //
4440 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4441 // the fast estimate available on the platform.
4442
4443 // current_thread_cpu_time() is not optimized for Windows yet
4444 jlong os::current_thread_cpu_time() {
4445 // return user + sys since the cost is the same
4446 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4447 }
4448
4449 jlong os::thread_cpu_time(Thread* thread) {
4450 // consistent with what current_thread_cpu_time() returns.
4451 return os::thread_cpu_time(thread, true /* user+sys */);
4452 }
4453
4454 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4455 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4456 }
4457
4458 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4459 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4460 // If this function changes, os::is_thread_cpu_time_supported() should too
4461 FILETIME CreationTime;
4462 FILETIME ExitTime;
4463 FILETIME KernelTime;
4464 FILETIME UserTime;
4465
4466 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4467 &ExitTime, &KernelTime, &UserTime) == 0) {
4468 return -1;
4469 } else if (user_sys_cpu_time) {
4470 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4471 } else {
4472 return FT2INT64(UserTime) * 100;
4473 }
4474 }
4475
4476 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4477 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4478 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4479 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4480 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4481 }
4482
4483 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4484 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4485 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4486 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4487 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4488 }
4489
4490 bool os::is_thread_cpu_time_supported() {
4491 // see os::thread_cpu_time
4492 FILETIME CreationTime;
4493 FILETIME ExitTime;
4494 FILETIME KernelTime;
4495 FILETIME UserTime;
4496
4497 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4498 &KernelTime, &UserTime) == 0) {
4499 return false;
4500 } else {
4501 return true;
4502 }
4503 }
4504
4505 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4506 // It does have primitives (PDH API) to get CPU usage and run queue length.
4507 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4508 // If we wanted to implement loadavg on Windows, we have a few options:
4509 //
4510 // a) Query CPU usage and run queue length and "fake" an answer by
4511 // returning the CPU usage if it's under 100%, and the run queue
4512 // length otherwise. It turns out that querying is pretty slow
4513 // on Windows, on the order of 200 microseconds on a fast machine.
4514 // Note that on the Windows the CPU usage value is the % usage
4515 // since the last time the API was called (and the first call
4516 // returns 100%), so we'd have to deal with that as well.
4517 //
4518 // b) Sample the "fake" answer using a sampling thread and store
4519 // the answer in a global variable. The call to loadavg would
4520 // just return the value of the global, avoiding the slow query.
4521 //
4522 // c) Sample a better answer using exponential decay to smooth the
4523 // value. This is basically the algorithm used by UNIX kernels.
4524 //
4525 // Note that sampling thread starvation could affect both (b) and (c).
4526 int os::loadavg(double loadavg[], int nelem) {
4527 return -1;
4528 }
4529
4530
4531 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4532 bool os::dont_yield() {
4533 return DontYieldALot;
4534 }
4535
4536 // This method is a slightly reworked copy of JDK's sysOpen
4537 // from src/windows/hpi/src/sys_api_md.c
4538
4539 int os::open(const char *path, int oflag, int mode) {
4540 char pathbuf[MAX_PATH];
4541
4542 if (strlen(path) > MAX_PATH - 1) {
4543 errno = ENAMETOOLONG;
4544 return -1;
4545 }
4546 os::native_path(strcpy(pathbuf, path));
4547 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4548 }
4549
4550 FILE* os::open(int fd, const char* mode) {
4551 return ::_fdopen(fd, mode);
4552 }
4553
4554 // Is a (classpath) directory empty?
4555 bool os::dir_is_empty(const char* path) {
4556 WIN32_FIND_DATA fd;
4557 HANDLE f = FindFirstFile(path, &fd);
4558 if (f == INVALID_HANDLE_VALUE) {
4559 return true;
4560 }
4561 FindClose(f);
4562 return false;
4563 }
4564
4565 // create binary file, rewriting existing file if required
4566 int os::create_binary_file(const char* path, bool rewrite_existing) {
4567 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4568 if (!rewrite_existing) {
4569 oflags |= _O_EXCL;
4570 }
4571 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4572 }
4573
4574 // return current position of file pointer
4575 jlong os::current_file_offset(int fd) {
4576 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4577 }
4578
4579 // move file pointer to the specified offset
4580 jlong os::seek_to_file_offset(int fd, jlong offset) {
4581 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4582 }
4583
4584
4585 jlong os::lseek(int fd, jlong offset, int whence) {
4586 return (jlong) ::_lseeki64(fd, offset, whence);
4587 }
4588
4589 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4590 OVERLAPPED ov;
4591 DWORD nread;
4592 BOOL result;
4593
4594 ZeroMemory(&ov, sizeof(ov));
4595 ov.Offset = (DWORD)offset;
4596 ov.OffsetHigh = (DWORD)(offset >> 32);
4597
4598 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4599
4600 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4601
4602 return result ? nread : 0;
4603 }
4604
4605
4606 // This method is a slightly reworked copy of JDK's sysNativePath
4607 // from src/windows/hpi/src/path_md.c
4608
4609 // Convert a pathname to native format. On win32, this involves forcing all
4610 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4611 // sometimes rejects '/') and removing redundant separators. The input path is
4612 // assumed to have been converted into the character encoding used by the local
4613 // system. Because this might be a double-byte encoding, care is taken to
4614 // treat double-byte lead characters correctly.
4615 //
4616 // This procedure modifies the given path in place, as the result is never
4617 // longer than the original. There is no error return; this operation always
4618 // succeeds.
4619 char * os::native_path(char *path) {
4620 char *src = path, *dst = path, *end = path;
4621 char *colon = NULL; // If a drive specifier is found, this will
4622 // point to the colon following the drive letter
4623
4624 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4625 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4626 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4627
4628 // Check for leading separators
4629 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4630 while (isfilesep(*src)) {
4631 src++;
4632 }
4633
4634 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4635 // Remove leading separators if followed by drive specifier. This
4636 // hack is necessary to support file URLs containing drive
4637 // specifiers (e.g., "file://c:/path"). As a side effect,
4638 // "/c:/path" can be used as an alternative to "c:/path".
4639 *dst++ = *src++;
4640 colon = dst;
4641 *dst++ = ':';
4642 src++;
4643 } else {
4644 src = path;
4645 if (isfilesep(src[0]) && isfilesep(src[1])) {
4646 // UNC pathname: Retain first separator; leave src pointed at
4647 // second separator so that further separators will be collapsed
4648 // into the second separator. The result will be a pathname
4649 // beginning with "\\\\" followed (most likely) by a host name.
4650 src = dst = path + 1;
4651 path[0] = '\\'; // Force first separator to '\\'
4652 }
4653 }
4654
4655 end = dst;
4656
4657 // Remove redundant separators from remainder of path, forcing all
4658 // separators to be '\\' rather than '/'. Also, single byte space
4659 // characters are removed from the end of the path because those
4660 // are not legal ending characters on this operating system.
4661 //
4662 while (*src != '\0') {
4663 if (isfilesep(*src)) {
4664 *dst++ = '\\'; src++;
4665 while (isfilesep(*src)) src++;
4666 if (*src == '\0') {
4667 // Check for trailing separator
4668 end = dst;
4669 if (colon == dst - 2) break; // "z:\\"
4670 if (dst == path + 1) break; // "\\"
4671 if (dst == path + 2 && isfilesep(path[0])) {
4672 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4673 // beginning of a UNC pathname. Even though it is not, by
4674 // itself, a valid UNC pathname, we leave it as is in order
4675 // to be consistent with the path canonicalizer as well
4676 // as the win32 APIs, which treat this case as an invalid
4677 // UNC pathname rather than as an alias for the root
4678 // directory of the current drive.
4679 break;
4680 }
4681 end = --dst; // Path does not denote a root directory, so
4682 // remove trailing separator
4683 break;
4684 }
4685 end = dst;
4686 } else {
4687 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4688 *dst++ = *src++;
4689 if (*src) *dst++ = *src++;
4690 end = dst;
4691 } else { // Copy a single-byte character
4692 char c = *src++;
4693 *dst++ = c;
4694 // Space is not a legal ending character
4695 if (c != ' ') end = dst;
4696 }
4697 }
4698 }
4699
4700 *end = '\0';
4701
4702 // For "z:", add "." to work around a bug in the C runtime library
4703 if (colon == dst - 1) {
4704 path[2] = '.';
4705 path[3] = '\0';
4706 }
4707
4708 return path;
4709 }
4710
4711 // This code is a copy of JDK's sysSetLength
4712 // from src/windows/hpi/src/sys_api_md.c
4713
4714 int os::ftruncate(int fd, jlong length) {
4715 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4716 long high = (long)(length >> 32);
4717 DWORD ret;
4718
4719 if (h == (HANDLE)(-1)) {
4720 return -1;
4721 }
4722
4723 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4724 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4725 return -1;
4726 }
4727
4728 if (::SetEndOfFile(h) == FALSE) {
4729 return -1;
4730 }
4731
4732 return 0;
4733 }
4734
4735 int os::get_fileno(FILE* fp) {
4736 return _fileno(fp);
4737 }
4738
4739 // This code is a copy of JDK's sysSync
4740 // from src/windows/hpi/src/sys_api_md.c
4741 // except for the legacy workaround for a bug in Win 98
4742
4743 int os::fsync(int fd) {
4744 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4745
4746 if ((!::FlushFileBuffers(handle)) &&
4747 (GetLastError() != ERROR_ACCESS_DENIED)) {
4748 // from winerror.h
4749 return -1;
4750 }
4751 return 0;
4752 }
4753
4754 static int nonSeekAvailable(int, long *);
4755 static int stdinAvailable(int, long *);
4756
4757 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4758 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4759
4760 // This code is a copy of JDK's sysAvailable
4761 // from src/windows/hpi/src/sys_api_md.c
4762
4763 int os::available(int fd, jlong *bytes) {
4764 jlong cur, end;
4765 struct _stati64 stbuf64;
4766
4767 if (::_fstati64(fd, &stbuf64) >= 0) {
4768 int mode = stbuf64.st_mode;
4769 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4770 int ret;
4771 long lpbytes;
4772 if (fd == 0) {
4773 ret = stdinAvailable(fd, &lpbytes);
4774 } else {
4775 ret = nonSeekAvailable(fd, &lpbytes);
4776 }
4777 (*bytes) = (jlong)(lpbytes);
4778 return ret;
4779 }
4780 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4781 return FALSE;
4782 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4783 return FALSE;
4784 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4785 return FALSE;
4786 }
4787 *bytes = end - cur;
4788 return TRUE;
4789 } else {
4790 return FALSE;
4791 }
4792 }
4793
4794 void os::flockfile(FILE* fp) {
4795 _lock_file(fp);
4796 }
4797
4798 void os::funlockfile(FILE* fp) {
4799 _unlock_file(fp);
4800 }
4801
4802 // This code is a copy of JDK's nonSeekAvailable
4803 // from src/windows/hpi/src/sys_api_md.c
4804
4805 static int nonSeekAvailable(int fd, long *pbytes) {
4806 // This is used for available on non-seekable devices
4807 // (like both named and anonymous pipes, such as pipes
4808 // connected to an exec'd process).
4809 // Standard Input is a special case.
4810 HANDLE han;
4811
4812 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4813 return FALSE;
4814 }
4815
4816 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4817 // PeekNamedPipe fails when at EOF. In that case we
4818 // simply make *pbytes = 0 which is consistent with the
4819 // behavior we get on Solaris when an fd is at EOF.
4820 // The only alternative is to raise an Exception,
4821 // which isn't really warranted.
4822 //
4823 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4824 return FALSE;
4825 }
4826 *pbytes = 0;
4827 }
4828 return TRUE;
4829 }
4830
4831 #define MAX_INPUT_EVENTS 2000
4832
4833 // This code is a copy of JDK's stdinAvailable
4834 // from src/windows/hpi/src/sys_api_md.c
4835
4836 static int stdinAvailable(int fd, long *pbytes) {
4837 HANDLE han;
4838 DWORD numEventsRead = 0; // Number of events read from buffer
4839 DWORD numEvents = 0; // Number of events in buffer
4840 DWORD i = 0; // Loop index
4841 DWORD curLength = 0; // Position marker
4842 DWORD actualLength = 0; // Number of bytes readable
4843 BOOL error = FALSE; // Error holder
4844 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4845
4846 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4847 return FALSE;
4848 }
4849
4850 // Construct an array of input records in the console buffer
4851 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4852 if (error == 0) {
4853 return nonSeekAvailable(fd, pbytes);
4854 }
4855
4856 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4857 if (numEvents > MAX_INPUT_EVENTS) {
4858 numEvents = MAX_INPUT_EVENTS;
4859 }
4860
4861 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4862 if (lpBuffer == NULL) {
4863 return FALSE;
4864 }
4865
4866 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4867 if (error == 0) {
4868 os::free(lpBuffer);
4869 return FALSE;
4870 }
4871
4872 // Examine input records for the number of bytes available
4873 for (i=0; i<numEvents; i++) {
4874 if (lpBuffer[i].EventType == KEY_EVENT) {
4875
4876 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4877 &(lpBuffer[i].Event);
4878 if (keyRecord->bKeyDown == TRUE) {
4879 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4880 curLength++;
4881 if (*keyPressed == '\r') {
4882 actualLength = curLength;
4883 }
4884 }
4885 }
4886 }
4887
4888 if (lpBuffer != NULL) {
4889 os::free(lpBuffer);
4890 }
4891
4892 *pbytes = (long) actualLength;
4893 return TRUE;
4894 }
4895
4896 // Map a block of memory.
4897 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4898 char *addr, size_t bytes, bool read_only,
4899 bool allow_exec) {
4900 HANDLE hFile;
4901 char* base;
4902
4903 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4904 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4905 if (hFile == NULL) {
4906 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4907 return NULL;
4908 }
4909
4910 if (allow_exec) {
4911 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4912 // unless it comes from a PE image (which the shared archive is not.)
4913 // Even VirtualProtect refuses to give execute access to mapped memory
4914 // that was not previously executable.
4915 //
4916 // Instead, stick the executable region in anonymous memory. Yuck.
4917 // Penalty is that ~4 pages will not be shareable - in the future
4918 // we might consider DLLizing the shared archive with a proper PE
4919 // header so that mapping executable + sharing is possible.
4920
4921 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4922 PAGE_READWRITE);
4923 if (base == NULL) {
4924 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4925 CloseHandle(hFile);
4926 return NULL;
4927 }
4928
4929 DWORD bytes_read;
4930 OVERLAPPED overlapped;
4931 overlapped.Offset = (DWORD)file_offset;
4932 overlapped.OffsetHigh = 0;
4933 overlapped.hEvent = NULL;
4934 // ReadFile guarantees that if the return value is true, the requested
4935 // number of bytes were read before returning.
4936 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4937 if (!res) {
4938 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4939 release_memory(base, bytes);
4940 CloseHandle(hFile);
4941 return NULL;
4942 }
4943 } else {
4944 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4945 NULL /* file_name */);
4946 if (hMap == NULL) {
4947 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4948 CloseHandle(hFile);
4949 return NULL;
4950 }
4951
4952 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4953 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4954 (DWORD)bytes, addr);
4955 if (base == NULL) {
4956 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4957 CloseHandle(hMap);
4958 CloseHandle(hFile);
4959 return NULL;
4960 }
4961
4962 if (CloseHandle(hMap) == 0) {
4963 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4964 CloseHandle(hFile);
4965 return base;
4966 }
4967 }
4968
4969 if (allow_exec) {
4970 DWORD old_protect;
4971 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4972 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4973
4974 if (!res) {
4975 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4976 // Don't consider this a hard error, on IA32 even if the
4977 // VirtualProtect fails, we should still be able to execute
4978 CloseHandle(hFile);
4979 return base;
4980 }
4981 }
4982
4983 if (CloseHandle(hFile) == 0) {
4984 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4985 return base;
4986 }
4987
4988 return base;
4989 }
4990
4991 // Remap a block of memory.
4992 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4993 char *addr, size_t bytes, bool read_only,
4994 bool allow_exec) {
4995 // This OS does not allow existing memory maps to be remapped so we
4996 // have to unmap the memory before we remap it.
4997 if (!os::unmap_memory(addr, bytes)) {
4998 return NULL;
4999 }
5000
5001 // There is a very small theoretical window between the unmap_memory()
5002 // call above and the map_memory() call below where a thread in native
5003 // code may be able to access an address that is no longer mapped.
5004
5005 return os::map_memory(fd, file_name, file_offset, addr, bytes,
5006 read_only, allow_exec);
5007 }
5008
5009
5010 // Unmap a block of memory.
5011 // Returns true=success, otherwise false.
5012
5013 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5014 MEMORY_BASIC_INFORMATION mem_info;
5015 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5016 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5017 return false;
5018 }
5019
5020 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5021 // Instead, executable region was allocated using VirtualAlloc(). See
5022 // pd_map_memory() above.
5023 //
5024 // The following flags should match the 'exec_access' flages used for
5025 // VirtualProtect() in pd_map_memory().
5026 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5027 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5028 return pd_release_memory(addr, bytes);
5029 }
5030
5031 BOOL result = UnmapViewOfFile(addr);
5032 if (result == 0) {
5033 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5034 return false;
5035 }
5036 return true;
5037 }
5038
5039 void os::pause() {
5040 char filename[MAX_PATH];
5041 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5042 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5043 } else {
5044 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5045 }
5046
5047 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5048 if (fd != -1) {
5049 struct stat buf;
5050 ::close(fd);
5051 while (::stat(filename, &buf) == 0) {
5052 Sleep(100);
5053 }
5054 } else {
5055 jio_fprintf(stderr,
5056 "Could not open pause file '%s', continuing immediately.\n", filename);
5057 }
5058 }
5059
5060 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
5061 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
5062 }
5063
5064 // See the caveats for this class in os_windows.hpp
5065 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5066 // into this method and returns false. If no OS EXCEPTION was raised, returns
5067 // true.
5068 // The callback is supposed to provide the method that should be protected.
5069 //
5070 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5071 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
5072 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
5073 "crash_protection already set?");
5074
5075 bool success = true;
5076 __try {
5077 WatcherThread::watcher_thread()->set_crash_protection(this);
5078 cb.call();
5079 } __except(EXCEPTION_EXECUTE_HANDLER) {
5080 // only for protection, nothing to do
5081 success = false;
5082 }
5083 WatcherThread::watcher_thread()->set_crash_protection(NULL);
5084 return success;
5085 }
5086
5087 // An Event wraps a win32 "CreateEvent" kernel handle.
5088 //
5089 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5090 //
5091 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5092 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5093 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5094 // In addition, an unpark() operation might fetch the handle field, but the
5095 // event could recycle between the fetch and the SetEvent() operation.
5096 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5097 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5098 // on an stale but recycled handle would be harmless, but in practice this might
5099 // confuse other non-Sun code, so it's not a viable approach.
5100 //
5101 // 2: Once a win32 event handle is associated with an Event, it remains associated
5102 // with the Event. The event handle is never closed. This could be construed
5103 // as handle leakage, but only up to the maximum # of threads that have been extant
5104 // at any one time. This shouldn't be an issue, as windows platforms typically
5105 // permit a process to have hundreds of thousands of open handles.
5106 //
5107 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5108 // and release unused handles.
5109 //
5110 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5111 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5112 //
5113 // 5. Use an RCU-like mechanism (Read-Copy Update).
5114 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5115 //
5116 // We use (2).
5117 //
5118 // TODO-FIXME:
5119 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5120 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5121 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5122 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5123 // into a single win32 CreateEvent() handle.
5124 //
5125 // Assumption:
5126 // Only one parker can exist on an event, which is why we allocate
5127 // them per-thread. Multiple unparkers can coexist.
5128 //
5129 // _Event transitions in park()
5130 // -1 => -1 : illegal
5131 // 1 => 0 : pass - return immediately
5132 // 0 => -1 : block; then set _Event to 0 before returning
5133 //
5134 // _Event transitions in unpark()
5135 // 0 => 1 : just return
5136 // 1 => 1 : just return
5137 // -1 => either 0 or 1; must signal target thread
5138 // That is, we can safely transition _Event from -1 to either
5139 // 0 or 1.
5140 //
5141 // _Event serves as a restricted-range semaphore.
5142 // -1 : thread is blocked, i.e. there is a waiter
5143 // 0 : neutral: thread is running or ready,
5144 // could have been signaled after a wait started
5145 // 1 : signaled - thread is running or ready
5146 //
5147 // Another possible encoding of _Event would be with
5148 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5149 //
5150
5151 int os::PlatformEvent::park(jlong Millis) {
5152 // Transitions for _Event:
5153 // -1 => -1 : illegal
5154 // 1 => 0 : pass - return immediately
5155 // 0 => -1 : block; then set _Event to 0 before returning
5156
5157 guarantee(_ParkHandle != NULL , "Invariant");
5158 guarantee(Millis > 0 , "Invariant");
5159
5160 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5161 // the initial park() operation.
5162 // Consider: use atomic decrement instead of CAS-loop
5163
5164 int v;
5165 for (;;) {
5166 v = _Event;
5167 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5168 }
5169 guarantee((v == 0) || (v == 1), "invariant");
5170 if (v != 0) return OS_OK;
5171
5172 // Do this the hard way by blocking ...
5173 // TODO: consider a brief spin here, gated on the success of recent
5174 // spin attempts by this thread.
5175 //
5176 // We decompose long timeouts into series of shorter timed waits.
5177 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5178 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5179 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5180 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5181 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5182 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5183 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5184 // for the already waited time. This policy does not admit any new outcomes.
5185 // In the future, however, we might want to track the accumulated wait time and
5186 // adjust Millis accordingly if we encounter a spurious wakeup.
5187
5188 const int MAXTIMEOUT = 0x10000000;
5189 DWORD rv = WAIT_TIMEOUT;
5190 while (_Event < 0 && Millis > 0) {
5191 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5192 if (Millis > MAXTIMEOUT) {
5193 prd = MAXTIMEOUT;
5194 }
5195 rv = ::WaitForSingleObject(_ParkHandle, prd);
5196 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5197 if (rv == WAIT_TIMEOUT) {
5198 Millis -= prd;
5199 }
5200 }
5201 v = _Event;
5202 _Event = 0;
5203 // see comment at end of os::PlatformEvent::park() below:
5204 OrderAccess::fence();
5205 // If we encounter a nearly simultanous timeout expiry and unpark()
5206 // we return OS_OK indicating we awoke via unpark().
5207 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5208 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5209 }
5210
5211 void os::PlatformEvent::park() {
5212 // Transitions for _Event:
5213 // -1 => -1 : illegal
5214 // 1 => 0 : pass - return immediately
5215 // 0 => -1 : block; then set _Event to 0 before returning
5216
5217 guarantee(_ParkHandle != NULL, "Invariant");
5218 // Invariant: Only the thread associated with the Event/PlatformEvent
5219 // may call park().
5220 // Consider: use atomic decrement instead of CAS-loop
5221 int v;
5222 for (;;) {
5223 v = _Event;
5224 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5225 }
5226 guarantee((v == 0) || (v == 1), "invariant");
5227 if (v != 0) return;
5228
5229 // Do this the hard way by blocking ...
5230 // TODO: consider a brief spin here, gated on the success of recent
5231 // spin attempts by this thread.
5232 while (_Event < 0) {
5233 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5234 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5235 }
5236
5237 // Usually we'll find _Event == 0 at this point, but as
5238 // an optional optimization we clear it, just in case can
5239 // multiple unpark() operations drove _Event up to 1.
5240 _Event = 0;
5241 OrderAccess::fence();
5242 guarantee(_Event >= 0, "invariant");
5243 }
5244
5245 void os::PlatformEvent::unpark() {
5246 guarantee(_ParkHandle != NULL, "Invariant");
5247
5248 // Transitions for _Event:
5249 // 0 => 1 : just return
5250 // 1 => 1 : just return
5251 // -1 => either 0 or 1; must signal target thread
5252 // That is, we can safely transition _Event from -1 to either
5253 // 0 or 1.
5254 // See also: "Semaphores in Plan 9" by Mullender & Cox
5255 //
5256 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5257 // that it will take two back-to-back park() calls for the owning
5258 // thread to block. This has the benefit of forcing a spurious return
5259 // from the first park() call after an unpark() call which will help
5260 // shake out uses of park() and unpark() without condition variables.
5261
5262 if (Atomic::xchg(1, &_Event) >= 0) return;
5263
5264 ::SetEvent(_ParkHandle);
5265 }
5266
5267
5268 // JSR166
5269 // -------------------------------------------------------
5270
5271 // The Windows implementation of Park is very straightforward: Basic
5272 // operations on Win32 Events turn out to have the right semantics to
5273 // use them directly. We opportunistically resuse the event inherited
5274 // from Monitor.
5275
5276 void Parker::park(bool isAbsolute, jlong time) {
5277 guarantee(_ParkEvent != NULL, "invariant");
5278 // First, demultiplex/decode time arguments
5279 if (time < 0) { // don't wait
5280 return;
5281 } else if (time == 0 && !isAbsolute) {
5282 time = INFINITE;
5283 } else if (isAbsolute) {
5284 time -= os::javaTimeMillis(); // convert to relative time
5285 if (time <= 0) { // already elapsed
5286 return;
5287 }
5288 } else { // relative
5289 time /= 1000000; // Must coarsen from nanos to millis
5290 if (time == 0) { // Wait for the minimal time unit if zero
5291 time = 1;
5292 }
5293 }
5294
5295 JavaThread* thread = JavaThread::current();
5296
5297 // Don't wait if interrupted or already triggered
5298 if (Thread::is_interrupted(thread, false) ||
5299 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5300 ResetEvent(_ParkEvent);
5301 return;
5302 } else {
5303 ThreadBlockInVM tbivm(thread);
5304 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5305 thread->set_suspend_equivalent();
5306
5307 WaitForSingleObject(_ParkEvent, time);
5308 ResetEvent(_ParkEvent);
5309
5310 // If externally suspended while waiting, re-suspend
5311 if (thread->handle_special_suspend_equivalent_condition()) {
5312 thread->java_suspend_self();
5313 }
5314 }
5315 }
5316
5317 void Parker::unpark() {
5318 guarantee(_ParkEvent != NULL, "invariant");
5319 SetEvent(_ParkEvent);
5320 }
5321
5322 // Run the specified command in a separate process. Return its exit value,
5323 // or -1 on failure (e.g. can't create a new process).
5324 int os::fork_and_exec(char* cmd) {
5325 STARTUPINFO si;
5326 PROCESS_INFORMATION pi;
5327
5328 memset(&si, 0, sizeof(si));
5329 si.cb = sizeof(si);
5330 memset(&pi, 0, sizeof(pi));
5331 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5332 cmd, // command line
5333 NULL, // process security attribute
5334 NULL, // thread security attribute
5335 TRUE, // inherits system handles
5336 0, // no creation flags
5337 NULL, // use parent's environment block
5338 NULL, // use parent's starting directory
5339 &si, // (in) startup information
5340 &pi); // (out) process information
5341
5342 if (rslt) {
5343 // Wait until child process exits.
5344 WaitForSingleObject(pi.hProcess, INFINITE);
5345
5346 DWORD exit_code;
5347 GetExitCodeProcess(pi.hProcess, &exit_code);
5348
5349 // Close process and thread handles.
5350 CloseHandle(pi.hProcess);
5351 CloseHandle(pi.hThread);
5352
5353 return (int)exit_code;
5354 } else {
5355 return -1;
5356 }
5357 }
5358
5359 bool os::find(address addr, outputStream* st) {
5360 int offset = -1;
5361 bool result = false;
5362 char buf[256];
5363 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5364 st->print(PTR_FORMAT " ", addr);
5365 if (strlen(buf) < sizeof(buf) - 1) {
5366 char* p = strrchr(buf, '\\');
5367 if (p) {
5368 st->print("%s", p + 1);
5369 } else {
5370 st->print("%s", buf);
5371 }
5372 } else {
5373 // The library name is probably truncated. Let's omit the library name.
5374 // See also JDK-8147512.
5375 }
5376 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5377 st->print("::%s + 0x%x", buf, offset);
5378 }
5379 st->cr();
5380 result = true;
5381 }
5382 return result;
5383 }
5384
5385 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5386 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5387
5388 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5389 JavaThread* thread = JavaThread::current();
5390 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5391 address addr = (address) exceptionRecord->ExceptionInformation[1];
5392
5393 if (os::is_memory_serialize_page(thread, addr)) {
5394 return EXCEPTION_CONTINUE_EXECUTION;
5395 }
5396 }
5397
5398 return EXCEPTION_CONTINUE_SEARCH;
5399 }
5400
5401 // We don't build a headless jre for Windows
5402 bool os::is_headless_jre() { return false; }
5403
5404 static jint initSock() {
5405 WSADATA wsadata;
5406
5407 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5408 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5409 ::GetLastError());
5410 return JNI_ERR;
5411 }
5412 return JNI_OK;
5413 }
5414
5415 struct hostent* os::get_host_by_name(char* name) {
5416 return (struct hostent*)gethostbyname(name);
5417 }
5418
5419 int os::socket_close(int fd) {
5420 return ::closesocket(fd);
5421 }
5422
5423 int os::socket(int domain, int type, int protocol) {
5424 return ::socket(domain, type, protocol);
5425 }
5426
5427 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5428 return ::connect(fd, him, len);
5429 }
5430
5431 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5432 return ::recv(fd, buf, (int)nBytes, flags);
5433 }
5434
5435 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5436 return ::send(fd, buf, (int)nBytes, flags);
5437 }
5438
5439 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5440 return ::send(fd, buf, (int)nBytes, flags);
5441 }
5442
5443 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5444 #if defined(IA32)
5445 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5446 #elif defined (AMD64)
5447 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5448 #endif
5449
5450 // returns true if thread could be suspended,
5451 // false otherwise
5452 static bool do_suspend(HANDLE* h) {
5453 if (h != NULL) {
5454 if (SuspendThread(*h) != ~0) {
5455 return true;
5456 }
5457 }
5458 return false;
5459 }
5460
5461 // resume the thread
5462 // calling resume on an active thread is a no-op
5463 static void do_resume(HANDLE* h) {
5464 if (h != NULL) {
5465 ResumeThread(*h);
5466 }
5467 }
5468
5469 // retrieve a suspend/resume context capable handle
5470 // from the tid. Caller validates handle return value.
5471 void get_thread_handle_for_extended_context(HANDLE* h,
5472 OSThread::thread_id_t tid) {
5473 if (h != NULL) {
5474 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5475 }
5476 }
5477
5478 // Thread sampling implementation
5479 //
5480 void os::SuspendedThreadTask::internal_do_task() {
5481 CONTEXT ctxt;
5482 HANDLE h = NULL;
5483
5484 // get context capable handle for thread
5485 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5486
5487 // sanity
5488 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5489 return;
5490 }
5491
5492 // suspend the thread
5493 if (do_suspend(&h)) {
5494 ctxt.ContextFlags = sampling_context_flags;
5495 // get thread context
5496 GetThreadContext(h, &ctxt);
5497 SuspendedThreadTaskContext context(_thread, &ctxt);
5498 // pass context to Thread Sampling impl
5499 do_task(context);
5500 // resume thread
5501 do_resume(&h);
5502 }
5503
5504 // close handle
5505 CloseHandle(h);
5506 }
5507
5508 bool os::start_debugging(char *buf, int buflen) {
5509 int len = (int)strlen(buf);
5510 char *p = &buf[len];
5511
5512 jio_snprintf(p, buflen-len,
5513 "\n\n"
5514 "Do you want to debug the problem?\n\n"
5515 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5516 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5517 "Otherwise, select 'No' to abort...",
5518 os::current_process_id(), os::current_thread_id());
5519
5520 bool yes = os::message_box("Unexpected Error", buf);
5521
5522 if (yes) {
5523 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5524 // exception. If VM is running inside a debugger, the debugger will
5525 // catch the exception. Otherwise, the breakpoint exception will reach
5526 // the default windows exception handler, which can spawn a debugger and
5527 // automatically attach to the dying VM.
5528 os::breakpoint();
5529 yes = false;
5530 }
5531 return yes;
5532 }
5533
5534 void* os::get_default_process_handle() {
5535 return (void*)GetModuleHandle(NULL);
5536 }
5537
5538 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5539 // which is used to find statically linked in agents.
5540 // Additionally for windows, takes into account __stdcall names.
5541 // Parameters:
5542 // sym_name: Symbol in library we are looking for
5543 // lib_name: Name of library to look in, NULL for shared libs.
5544 // is_absolute_path == true if lib_name is absolute path to agent
5545 // such as "C:/a/b/L.dll"
5546 // == false if only the base name of the library is passed in
5547 // such as "L"
5548 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5549 bool is_absolute_path) {
5550 char *agent_entry_name;
5551 size_t len;
5552 size_t name_len;
5553 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5554 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5555 const char *start;
5556
5557 if (lib_name != NULL) {
5558 len = name_len = strlen(lib_name);
5559 if (is_absolute_path) {
5560 // Need to strip path, prefix and suffix
5561 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5562 lib_name = ++start;
5563 } else {
5564 // Need to check for drive prefix
5565 if ((start = strchr(lib_name, ':')) != NULL) {
5566 lib_name = ++start;
5567 }
5568 }
5569 if (len <= (prefix_len + suffix_len)) {
5570 return NULL;
5571 }
5572 lib_name += prefix_len;
5573 name_len = strlen(lib_name) - suffix_len;
5574 }
5575 }
5576 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5577 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5578 if (agent_entry_name == NULL) {
5579 return NULL;
5580 }
5581 if (lib_name != NULL) {
5582 const char *p = strrchr(sym_name, '@');
5583 if (p != NULL && p != sym_name) {
5584 // sym_name == _Agent_OnLoad@XX
5585 strncpy(agent_entry_name, sym_name, (p - sym_name));
5586 agent_entry_name[(p-sym_name)] = '\0';
5587 // agent_entry_name == _Agent_OnLoad
5588 strcat(agent_entry_name, "_");
5589 strncat(agent_entry_name, lib_name, name_len);
5590 strcat(agent_entry_name, p);
5591 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5592 } else {
5593 strcpy(agent_entry_name, sym_name);
5594 strcat(agent_entry_name, "_");
5595 strncat(agent_entry_name, lib_name, name_len);
5596 }
5597 } else {
5598 strcpy(agent_entry_name, sym_name);
5599 }
5600 return agent_entry_name;
5601 }
5602
5603 #ifndef PRODUCT
5604
5605 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5606 // contiguous memory block at a particular address.
5607 // The test first tries to find a good approximate address to allocate at by using the same
5608 // method to allocate some memory at any address. The test then tries to allocate memory in
5609 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5610 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5611 // the previously allocated memory is available for allocation. The only actual failure
5612 // that is reported is when the test tries to allocate at a particular location but gets a
5613 // different valid one. A NULL return value at this point is not considered an error but may
5614 // be legitimate.
5615 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5616 void TestReserveMemorySpecial_test() {
5617 if (!UseLargePages) {
5618 if (VerboseInternalVMTests) {
5619 tty->print("Skipping test because large pages are disabled");
5620 }
5621 return;
5622 }
5623 // save current value of globals
5624 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5625 bool old_use_numa_interleaving = UseNUMAInterleaving;
5626
5627 // set globals to make sure we hit the correct code path
5628 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5629
5630 // do an allocation at an address selected by the OS to get a good one.
5631 const size_t large_allocation_size = os::large_page_size() * 4;
5632 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5633 if (result == NULL) {
5634 if (VerboseInternalVMTests) {
5635 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5636 large_allocation_size);
5637 }
5638 } else {
5639 os::release_memory_special(result, large_allocation_size);
5640
5641 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5642 // we managed to get it once.
5643 const size_t expected_allocation_size = os::large_page_size();
5644 char* expected_location = result + os::large_page_size();
5645 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5646 if (actual_location == NULL) {
5647 if (VerboseInternalVMTests) {
5648 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5649 expected_location, large_allocation_size);
5650 }
5651 } else {
5652 // release memory
5653 os::release_memory_special(actual_location, expected_allocation_size);
5654 // only now check, after releasing any memory to avoid any leaks.
5655 assert(actual_location == expected_location,
5656 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5657 expected_location, expected_allocation_size, actual_location);
5658 }
5659 }
5660
5661 // restore globals
5662 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5663 UseNUMAInterleaving = old_use_numa_interleaving;
5664 }
5665 #endif // PRODUCT
5666
5667 /*
5668 All the defined signal names for Windows.
5669
5670 NOTE that not all of these names are accepted by FindSignal!
5671
5672 For various reasons some of these may be rejected at runtime.
5673
5674 Here are the names currently accepted by a user of sun.misc.Signal with
5675 1.4.1 (ignoring potential interaction with use of chaining, etc):
5676
5677 (LIST TBD)
5678
5679 */
5680 int os::get_signal_number(const char* name) {
5681 static const struct {
5682 char* name;
5683 int number;
5684 } siglabels [] =
5685 // derived from version 6.0 VC98/include/signal.h
5686 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5687 "FPE", SIGFPE, // floating point exception
5688 "SEGV", SIGSEGV, // segment violation
5689 "INT", SIGINT, // interrupt
5690 "TERM", SIGTERM, // software term signal from kill
5691 "BREAK", SIGBREAK, // Ctrl-Break sequence
5692 "ILL", SIGILL}; // illegal instruction
5693 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5694 if (strcmp(name, siglabels[i].name) == 0) {
5695 return siglabels[i].number;
5696 }
5697 }
5698 return -1;
5699 }
5700
5701 // Fast current thread access
5702
5703 int os::win32::_thread_ptr_offset = 0;
5704
5705 static void call_wrapper_dummy() {}
5706
5707 // We need to call the os_exception_wrapper once so that it sets
5708 // up the offset from FS of the thread pointer.
5709 void os::win32::initialize_thread_ptr_offset() {
5710 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5711 NULL, NULL, NULL, NULL);
5712 }