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