1 /*
2 * Copyright (c) 1997, 2015, 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 "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.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.inline.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 "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/vmError.hpp"
74
75 #ifdef _DEBUG
76 #include <crtdbg.h>
77 #endif
78
79
80 #include <windows.h>
81 #include <sys/types.h>
82 #include <sys/stat.h>
83 #include <sys/timeb.h>
84 #include <objidl.h>
85 #include <shlobj.h>
86
87 #include <malloc.h>
88 #include <signal.h>
89 #include <direct.h>
90 #include <errno.h>
91 #include <fcntl.h>
92 #include <io.h>
93 #include <process.h> // For _beginthreadex(), _endthreadex()
94 #include <imagehlp.h> // For os::dll_address_to_function_name
95 // for enumerating dll libraries
96 #include <vdmdbg.h>
97
98 // for timer info max values which include all bits
99 #define ALL_64_BITS CONST64(-1)
100
101 // For DLL loading/load error detection
102 // Values of PE COFF
103 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
104 #define IMAGE_FILE_SIGNATURE_LENGTH 4
105
106 static HANDLE main_process;
107 static HANDLE main_thread;
108 static int main_thread_id;
109
110 static FILETIME process_creation_time;
111 static FILETIME process_exit_time;
112 static FILETIME process_user_time;
113 static FILETIME process_kernel_time;
114
115 #ifdef _M_IA64
116 #define __CPU__ ia64
117 #elif _M_AMD64
118 #define __CPU__ amd64
119 #else
120 #define __CPU__ i486
121 #endif
122
123 // save DLL module handle, used by GetModuleFileName
124
125 HINSTANCE vm_lib_handle;
126
127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
128 switch (reason) {
129 case DLL_PROCESS_ATTACH:
130 vm_lib_handle = hinst;
131 if (ForceTimeHighResolution) {
132 timeBeginPeriod(1L);
133 }
134 break;
135 case DLL_PROCESS_DETACH:
136 if (ForceTimeHighResolution) {
137 timeEndPeriod(1L);
138 }
139 break;
140 default:
141 break;
142 }
143 return true;
144 }
145
146 static inline double fileTimeAsDouble(FILETIME* time) {
147 const double high = (double) ((unsigned int) ~0);
148 const double split = 10000000.0;
149 double result = (time->dwLowDateTime / split) +
150 time->dwHighDateTime * (high/split);
151 return result;
152 }
153
154 // Implementation of os
155
156 bool os::unsetenv(const char* name) {
157 assert(name != NULL, "Null pointer");
158 return (SetEnvironmentVariable(name, NULL) == TRUE);
159 }
160
161 // No setuid programs under Windows.
162 bool os::have_special_privileges() {
163 return false;
164 }
165
166
167 // This method is a periodic task to check for misbehaving JNI applications
168 // under CheckJNI, we can add any periodic checks here.
169 // For Windows at the moment does nothing
170 void os::run_periodic_checks() {
171 return;
172 }
173
174 // previous UnhandledExceptionFilter, if there is one
175 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
176
177 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
178
179 void os::init_system_properties_values() {
180 // sysclasspath, java_home, dll_dir
181 {
182 char *home_path;
183 char *dll_path;
184 char *pslash;
185 char *bin = "\\bin";
186 char home_dir[MAX_PATH + 1];
187 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
188
189 if (alt_home_dir != NULL) {
190 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
191 home_dir[MAX_PATH] = '\0';
192 } else {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; // get rid of \{client|server}
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \bin
203 }
204 }
205 }
206
207 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
208 if (home_path == NULL) {
209 return;
210 }
211 strcpy(home_path, home_dir);
212 Arguments::set_java_home(home_path);
213 FREE_C_HEAP_ARRAY(char, home_path);
214
215 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
216 mtInternal);
217 if (dll_path == NULL) {
218 return;
219 }
220 strcpy(dll_path, home_dir);
221 strcat(dll_path, bin);
222 Arguments::set_dll_dir(dll_path);
223 FREE_C_HEAP_ARRAY(char, dll_path);
224
225 if (!set_boot_path('\\', ';')) {
226 return;
227 }
228 }
229
230 // library_path
231 #define EXT_DIR "\\lib\\ext"
232 #define BIN_DIR "\\bin"
233 #define PACKAGE_DIR "\\Sun\\Java"
234 {
235 // Win32 library search order (See the documentation for LoadLibrary):
236 //
237 // 1. The directory from which application is loaded.
238 // 2. The system wide Java Extensions directory (Java only)
239 // 3. System directory (GetSystemDirectory)
240 // 4. Windows directory (GetWindowsDirectory)
241 // 5. The PATH environment variable
242 // 6. The current directory
243
244 char *library_path;
245 char tmp[MAX_PATH];
246 char *path_str = ::getenv("PATH");
247
248 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
249 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
250
251 library_path[0] = '\0';
252
253 GetModuleFileName(NULL, tmp, sizeof(tmp));
254 *(strrchr(tmp, '\\')) = '\0';
255 strcat(library_path, tmp);
256
257 GetWindowsDirectory(tmp, sizeof(tmp));
258 strcat(library_path, ";");
259 strcat(library_path, tmp);
260 strcat(library_path, PACKAGE_DIR BIN_DIR);
261
262 GetSystemDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265
266 GetWindowsDirectory(tmp, sizeof(tmp));
267 strcat(library_path, ";");
268 strcat(library_path, tmp);
269
270 if (path_str) {
271 strcat(library_path, ";");
272 strcat(library_path, path_str);
273 }
274
275 strcat(library_path, ";.");
276
277 Arguments::set_library_path(library_path);
278 FREE_C_HEAP_ARRAY(char, library_path);
279 }
280
281 // Default extensions directory
282 {
283 char path[MAX_PATH];
284 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
285 GetWindowsDirectory(path, MAX_PATH);
286 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
287 path, PACKAGE_DIR, EXT_DIR);
288 Arguments::set_ext_dirs(buf);
289 }
290 #undef EXT_DIR
291 #undef BIN_DIR
292 #undef PACKAGE_DIR
293
294 #ifndef _WIN64
295 // set our UnhandledExceptionFilter and save any previous one
296 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
297 #endif
298
299 // Done
300 return;
301 }
302
303 void os::breakpoint() {
304 DebugBreak();
305 }
306
307 // Invoked from the BREAKPOINT Macro
308 extern "C" void breakpoint() {
309 os::breakpoint();
310 }
311
312 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
313 // So far, this method is only used by Native Memory Tracking, which is
314 // only supported on Windows XP or later.
315 //
316 int os::get_native_stack(address* stack, int frames, int toSkip) {
317 #ifdef _NMT_NOINLINE_
318 toSkip++;
319 #endif
320 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
321 (PVOID*)stack, NULL);
322 for (int index = captured; index < frames; index ++) {
323 stack[index] = NULL;
324 }
325 return captured;
326 }
327
328
329 // os::current_stack_base()
330 //
331 // Returns the base of the stack, which is the stack's
332 // starting address. This function must be called
333 // while running on the stack of the thread being queried.
334
335 address os::current_stack_base() {
336 MEMORY_BASIC_INFORMATION minfo;
337 address stack_bottom;
338 size_t stack_size;
339
340 VirtualQuery(&minfo, &minfo, sizeof(minfo));
341 stack_bottom = (address)minfo.AllocationBase;
342 stack_size = minfo.RegionSize;
343
344 // Add up the sizes of all the regions with the same
345 // AllocationBase.
346 while (1) {
347 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
348 if (stack_bottom == (address)minfo.AllocationBase) {
349 stack_size += minfo.RegionSize;
350 } else {
351 break;
352 }
353 }
354
355 #ifdef _M_IA64
356 // IA64 has memory and register stacks
357 //
358 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
359 // at thread creation (1MB backing store growing upwards, 1MB memory stack
360 // growing downwards, 2MB summed up)
361 //
362 // ...
363 // ------- top of stack (high address) -----
364 // |
365 // | 1MB
366 // | Backing Store (Register Stack)
367 // |
368 // | / \
369 // | |
370 // | |
371 // | |
372 // ------------------------ stack base -----
373 // | 1MB
374 // | Memory Stack
375 // |
376 // | |
377 // | |
378 // | |
379 // | \ /
380 // |
381 // ----- bottom of stack (low address) -----
382 // ...
383
384 stack_size = stack_size / 2;
385 #endif
386 return stack_bottom + stack_size;
387 }
388
389 size_t os::current_stack_size() {
390 size_t sz;
391 MEMORY_BASIC_INFORMATION minfo;
392 VirtualQuery(&minfo, &minfo, sizeof(minfo));
393 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
394 return sz;
395 }
396
397 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
398 const struct tm* time_struct_ptr = localtime(clock);
399 if (time_struct_ptr != NULL) {
400 *res = *time_struct_ptr;
401 return res;
402 }
403 return NULL;
404 }
405
406 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
407
408 // Thread start routine for all new Java threads
409 static unsigned __stdcall java_start(Thread* thread) {
410 // Try to randomize the cache line index of hot stack frames.
411 // This helps when threads of the same stack traces evict each other's
412 // cache lines. The threads can be either from the same JVM instance, or
413 // from different JVM instances. The benefit is especially true for
414 // processors with hyperthreading technology.
415 static int counter = 0;
416 int pid = os::current_process_id();
417 _alloca(((pid ^ counter++) & 7) * 128);
418
419 OSThread* osthr = thread->osthread();
420 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
421
422 if (UseNUMA) {
423 int lgrp_id = os::numa_get_group_id();
424 if (lgrp_id != -1) {
425 thread->set_lgrp_id(lgrp_id);
426 }
427 }
428
429 // Diagnostic code to investigate JDK-6573254
430 int res = 30115; // non-java thread
431 if (thread->is_Java_thread()) {
432 res = 20115; // java thread
433 }
434
435 // Install a win32 structured exception handler around every thread created
436 // by VM, so VM can generate error dump when an exception occurred in non-
437 // Java thread (e.g. VM thread).
438 __try {
439 thread->run();
440 } __except(topLevelExceptionFilter(
441 (_EXCEPTION_POINTERS*)_exception_info())) {
442 // Nothing to do.
443 }
444
445 // One less thread is executing
446 // When the VMThread gets here, the main thread may have already exited
447 // which frees the CodeHeap containing the Atomic::add code
448 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
449 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
450 }
451
452 // Thread must not return from exit_process_or_thread(), but if it does,
453 // let it proceed to exit normally
454 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
455 }
456
457 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
458 int thread_id) {
459 // Allocate the OSThread object
460 OSThread* osthread = new OSThread(NULL, NULL);
461 if (osthread == NULL) return NULL;
462
463 // Initialize support for Java interrupts
464 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
465 if (interrupt_event == NULL) {
466 delete osthread;
467 return NULL;
468 }
469 osthread->set_interrupt_event(interrupt_event);
470
471 // Store info on the Win32 thread into the OSThread
472 osthread->set_thread_handle(thread_handle);
473 osthread->set_thread_id(thread_id);
474
475 if (UseNUMA) {
476 int lgrp_id = os::numa_get_group_id();
477 if (lgrp_id != -1) {
478 thread->set_lgrp_id(lgrp_id);
479 }
480 }
481
482 // Initial thread state is INITIALIZED, not SUSPENDED
483 osthread->set_state(INITIALIZED);
484
485 return osthread;
486 }
487
488
489 bool os::create_attached_thread(JavaThread* thread) {
490 #ifdef ASSERT
491 thread->verify_not_published();
492 #endif
493 HANDLE thread_h;
494 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
495 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
496 fatal("DuplicateHandle failed\n");
497 }
498 OSThread* osthread = create_os_thread(thread, thread_h,
499 (int)current_thread_id());
500 if (osthread == NULL) {
501 return false;
502 }
503
504 // Initial thread state is RUNNABLE
505 osthread->set_state(RUNNABLE);
506
507 thread->set_osthread(osthread);
508 return true;
509 }
510
511 bool os::create_main_thread(JavaThread* thread) {
512 #ifdef ASSERT
513 thread->verify_not_published();
514 #endif
515 if (_starting_thread == NULL) {
516 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
517 if (_starting_thread == NULL) {
518 return false;
519 }
520 }
521
522 // The primordial thread is runnable from the start)
523 _starting_thread->set_state(RUNNABLE);
524
525 thread->set_osthread(_starting_thread);
526 return true;
527 }
528
529 // Allocate and initialize a new OSThread
530 bool os::create_thread(Thread* thread, ThreadType thr_type,
531 size_t stack_size) {
532 unsigned thread_id;
533
534 // Allocate the OSThread object
535 OSThread* osthread = new OSThread(NULL, NULL);
536 if (osthread == NULL) {
537 return false;
538 }
539
540 // Initialize support for Java interrupts
541 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
542 if (interrupt_event == NULL) {
543 delete osthread;
544 return NULL;
545 }
546 osthread->set_interrupt_event(interrupt_event);
547 osthread->set_interrupted(false);
548
549 thread->set_osthread(osthread);
550
551 if (stack_size == 0) {
552 switch (thr_type) {
553 case os::java_thread:
554 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
555 if (JavaThread::stack_size_at_create() > 0) {
556 stack_size = JavaThread::stack_size_at_create();
557 }
558 break;
559 case os::compiler_thread:
560 if (CompilerThreadStackSize > 0) {
561 stack_size = (size_t)(CompilerThreadStackSize * K);
562 break;
563 } // else fall through:
564 // use VMThreadStackSize if CompilerThreadStackSize is not defined
565 case os::vm_thread:
566 case os::pgc_thread:
567 case os::cgc_thread:
568 case os::watcher_thread:
569 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
570 break;
571 }
572 }
573
574 // Create the Win32 thread
575 //
576 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
577 // does not specify stack size. Instead, it specifies the size of
578 // initially committed space. The stack size is determined by
579 // PE header in the executable. If the committed "stack_size" is larger
580 // than default value in the PE header, the stack is rounded up to the
581 // nearest multiple of 1MB. For example if the launcher has default
582 // stack size of 320k, specifying any size less than 320k does not
583 // affect the actual stack size at all, it only affects the initial
584 // commitment. On the other hand, specifying 'stack_size' larger than
585 // default value may cause significant increase in memory usage, because
586 // not only the stack space will be rounded up to MB, but also the
587 // entire space is committed upfront.
588 //
589 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
590 // for CreateThread() that can treat 'stack_size' as stack size. However we
591 // are not supposed to call CreateThread() directly according to MSDN
592 // document because JVM uses C runtime library. The good news is that the
593 // flag appears to work with _beginthredex() as well.
594
595 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
596 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
597 #endif
598
599 HANDLE thread_handle =
600 (HANDLE)_beginthreadex(NULL,
601 (unsigned)stack_size,
602 (unsigned (__stdcall *)(void*)) java_start,
603 thread,
604 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
605 &thread_id);
606 if (thread_handle == NULL) {
607 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
608 // without the flag.
609 thread_handle =
610 (HANDLE)_beginthreadex(NULL,
611 (unsigned)stack_size,
612 (unsigned (__stdcall *)(void*)) java_start,
613 thread,
614 CREATE_SUSPENDED,
615 &thread_id);
616 }
617 if (thread_handle == NULL) {
618 // Need to clean up stuff we've allocated so far
619 CloseHandle(osthread->interrupt_event());
620 thread->set_osthread(NULL);
621 delete osthread;
622 return NULL;
623 }
624
625 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
626
627 // Store info on the Win32 thread into the OSThread
628 osthread->set_thread_handle(thread_handle);
629 osthread->set_thread_id(thread_id);
630
631 // Initial thread state is INITIALIZED, not SUSPENDED
632 osthread->set_state(INITIALIZED);
633
634 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
635 return true;
636 }
637
638
639 // Free Win32 resources related to the OSThread
640 void os::free_thread(OSThread* osthread) {
641 assert(osthread != NULL, "osthread not set");
642 CloseHandle(osthread->thread_handle());
643 CloseHandle(osthread->interrupt_event());
644 delete osthread;
645 }
646
647 static jlong first_filetime;
648 static jlong initial_performance_count;
649 static jlong performance_frequency;
650
651
652 jlong as_long(LARGE_INTEGER x) {
653 jlong result = 0; // initialization to avoid warning
654 set_high(&result, x.HighPart);
655 set_low(&result, x.LowPart);
656 return result;
657 }
658
659
660 jlong os::elapsed_counter() {
661 LARGE_INTEGER count;
662 if (win32::_has_performance_count) {
663 QueryPerformanceCounter(&count);
664 return as_long(count) - initial_performance_count;
665 } else {
666 FILETIME wt;
667 GetSystemTimeAsFileTime(&wt);
668 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
669 }
670 }
671
672
673 jlong os::elapsed_frequency() {
674 if (win32::_has_performance_count) {
675 return performance_frequency;
676 } else {
677 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
678 return 10000000;
679 }
680 }
681
682
683 julong os::available_memory() {
684 return win32::available_memory();
685 }
686
687 julong os::win32::available_memory() {
688 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
689 // value if total memory is larger than 4GB
690 MEMORYSTATUSEX ms;
691 ms.dwLength = sizeof(ms);
692 GlobalMemoryStatusEx(&ms);
693
694 return (julong)ms.ullAvailPhys;
695 }
696
697 julong os::physical_memory() {
698 return win32::physical_memory();
699 }
700
701 bool os::has_allocatable_memory_limit(julong* limit) {
702 MEMORYSTATUSEX ms;
703 ms.dwLength = sizeof(ms);
704 GlobalMemoryStatusEx(&ms);
705 #ifdef _LP64
706 *limit = (julong)ms.ullAvailVirtual;
707 return true;
708 #else
709 // Limit to 1400m because of the 2gb address space wall
710 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
711 return true;
712 #endif
713 }
714
715 // VC6 lacks DWORD_PTR
716 #if _MSC_VER < 1300
717 typedef UINT_PTR DWORD_PTR;
718 #endif
719
720 int os::active_processor_count() {
721 DWORD_PTR lpProcessAffinityMask = 0;
722 DWORD_PTR lpSystemAffinityMask = 0;
723 int proc_count = processor_count();
724 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
725 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
726 // Nof active processors is number of bits in process affinity mask
727 int bitcount = 0;
728 while (lpProcessAffinityMask != 0) {
729 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
730 bitcount++;
731 }
732 return bitcount;
733 } else {
734 return proc_count;
735 }
736 }
737
738 void os::set_native_thread_name(const char *name) {
739
740 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
741 //
742 // Note that unfortunately this only works if the process
743 // is already attached to a debugger; debugger must observe
744 // the exception below to show the correct name.
745
746 const DWORD MS_VC_EXCEPTION = 0x406D1388;
747 struct {
748 DWORD dwType; // must be 0x1000
749 LPCSTR szName; // pointer to name (in user addr space)
750 DWORD dwThreadID; // thread ID (-1=caller thread)
751 DWORD dwFlags; // reserved for future use, must be zero
752 } info;
753
754 info.dwType = 0x1000;
755 info.szName = name;
756 info.dwThreadID = -1;
757 info.dwFlags = 0;
758
759 __try {
760 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
761 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
762 }
763
764 bool os::distribute_processes(uint length, uint* distribution) {
765 // Not yet implemented.
766 return false;
767 }
768
769 bool os::bind_to_processor(uint processor_id) {
770 // Not yet implemented.
771 return false;
772 }
773
774 void os::win32::initialize_performance_counter() {
775 LARGE_INTEGER count;
776 if (QueryPerformanceFrequency(&count)) {
777 win32::_has_performance_count = 1;
778 performance_frequency = as_long(count);
779 QueryPerformanceCounter(&count);
780 initial_performance_count = as_long(count);
781 } else {
782 win32::_has_performance_count = 0;
783 FILETIME wt;
784 GetSystemTimeAsFileTime(&wt);
785 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
786 }
787 }
788
789
790 double os::elapsedTime() {
791 return (double) elapsed_counter() / (double) elapsed_frequency();
792 }
793
794
795 // Windows format:
796 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
797 // Java format:
798 // Java standards require the number of milliseconds since 1/1/1970
799
800 // Constant offset - calculated using offset()
801 static jlong _offset = 116444736000000000;
802 // Fake time counter for reproducible results when debugging
803 static jlong fake_time = 0;
804
805 #ifdef ASSERT
806 // Just to be safe, recalculate the offset in debug mode
807 static jlong _calculated_offset = 0;
808 static int _has_calculated_offset = 0;
809
810 jlong offset() {
811 if (_has_calculated_offset) return _calculated_offset;
812 SYSTEMTIME java_origin;
813 java_origin.wYear = 1970;
814 java_origin.wMonth = 1;
815 java_origin.wDayOfWeek = 0; // ignored
816 java_origin.wDay = 1;
817 java_origin.wHour = 0;
818 java_origin.wMinute = 0;
819 java_origin.wSecond = 0;
820 java_origin.wMilliseconds = 0;
821 FILETIME jot;
822 if (!SystemTimeToFileTime(&java_origin, &jot)) {
823 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
824 }
825 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
826 _has_calculated_offset = 1;
827 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
828 return _calculated_offset;
829 }
830 #else
831 jlong offset() {
832 return _offset;
833 }
834 #endif
835
836 jlong windows_to_java_time(FILETIME wt) {
837 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
838 return (a - offset()) / 10000;
839 }
840
841 // Returns time ticks in (10th of micro seconds)
842 jlong windows_to_time_ticks(FILETIME wt) {
843 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
844 return (a - offset());
845 }
846
847 FILETIME java_to_windows_time(jlong l) {
848 jlong a = (l * 10000) + offset();
849 FILETIME result;
850 result.dwHighDateTime = high(a);
851 result.dwLowDateTime = low(a);
852 return result;
853 }
854
855 bool os::supports_vtime() { return true; }
856 bool os::enable_vtime() { return false; }
857 bool os::vtime_enabled() { return false; }
858
859 double os::elapsedVTime() {
860 FILETIME created;
861 FILETIME exited;
862 FILETIME kernel;
863 FILETIME user;
864 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
865 // the resolution of windows_to_java_time() should be sufficient (ms)
866 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
867 } else {
868 return elapsedTime();
869 }
870 }
871
872 jlong os::javaTimeMillis() {
873 if (UseFakeTimers) {
874 return fake_time++;
875 } else {
876 FILETIME wt;
877 GetSystemTimeAsFileTime(&wt);
878 return windows_to_java_time(wt);
879 }
880 }
881
882 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
883 FILETIME wt;
884 GetSystemTimeAsFileTime(&wt);
885 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
886 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
887 seconds = secs;
888 nanos = jlong(ticks - (secs*10000000)) * 100;
889 }
890
891 jlong os::javaTimeNanos() {
892 if (!win32::_has_performance_count) {
893 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
894 } else {
895 LARGE_INTEGER current_count;
896 QueryPerformanceCounter(¤t_count);
897 double current = as_long(current_count);
898 double freq = performance_frequency;
899 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
900 return time;
901 }
902 }
903
904 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
905 if (!win32::_has_performance_count) {
906 // javaTimeMillis() doesn't have much percision,
907 // but it is not going to wrap -- so all 64 bits
908 info_ptr->max_value = ALL_64_BITS;
909
910 // this is a wall clock timer, so may skip
911 info_ptr->may_skip_backward = true;
912 info_ptr->may_skip_forward = true;
913 } else {
914 jlong freq = performance_frequency;
915 if (freq < NANOSECS_PER_SEC) {
916 // the performance counter is 64 bits and we will
917 // be multiplying it -- so no wrap in 64 bits
918 info_ptr->max_value = ALL_64_BITS;
919 } else if (freq > NANOSECS_PER_SEC) {
920 // use the max value the counter can reach to
921 // determine the max value which could be returned
922 julong max_counter = (julong)ALL_64_BITS;
923 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
924 } else {
925 // the performance counter is 64 bits and we will
926 // be using it directly -- so no wrap in 64 bits
927 info_ptr->max_value = ALL_64_BITS;
928 }
929
930 // using a counter, so no skipping
931 info_ptr->may_skip_backward = false;
932 info_ptr->may_skip_forward = false;
933 }
934 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
935 }
936
937 char* os::local_time_string(char *buf, size_t buflen) {
938 SYSTEMTIME st;
939 GetLocalTime(&st);
940 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
941 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
942 return buf;
943 }
944
945 bool os::getTimesSecs(double* process_real_time,
946 double* process_user_time,
947 double* process_system_time) {
948 HANDLE h_process = GetCurrentProcess();
949 FILETIME create_time, exit_time, kernel_time, user_time;
950 BOOL result = GetProcessTimes(h_process,
951 &create_time,
952 &exit_time,
953 &kernel_time,
954 &user_time);
955 if (result != 0) {
956 FILETIME wt;
957 GetSystemTimeAsFileTime(&wt);
958 jlong rtc_millis = windows_to_java_time(wt);
959 jlong user_millis = windows_to_java_time(user_time);
960 jlong system_millis = windows_to_java_time(kernel_time);
961 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
962 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
963 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
964 return true;
965 } else {
966 return false;
967 }
968 }
969
970 void os::shutdown() {
971 // allow PerfMemory to attempt cleanup of any persistent resources
972 perfMemory_exit();
973
974 // flush buffered output, finish log files
975 ostream_abort();
976
977 // Check for abort hook
978 abort_hook_t abort_hook = Arguments::abort_hook();
979 if (abort_hook != NULL) {
980 abort_hook();
981 }
982 }
983
984
985 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
986 PMINIDUMP_EXCEPTION_INFORMATION,
987 PMINIDUMP_USER_STREAM_INFORMATION,
988 PMINIDUMP_CALLBACK_INFORMATION);
989
990 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
991 HINSTANCE dbghelp;
992 EXCEPTION_POINTERS ep;
993 MINIDUMP_EXCEPTION_INFORMATION mei;
994 MINIDUMP_EXCEPTION_INFORMATION* pmei;
995
996 HANDLE hProcess = GetCurrentProcess();
997 DWORD processId = GetCurrentProcessId();
998 HANDLE dumpFile;
999 MINIDUMP_TYPE dumpType;
1000 static const char* cwd;
1001
1002 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
1003 #ifndef ASSERT
1004 // If running on a client version of Windows and user has not explicitly enabled dumping
1005 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
1006 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
1007 return;
1008 // If running on a server version of Windows and user has explictly disabled dumping
1009 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1010 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1011 return;
1012 }
1013 #else
1014 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1015 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1016 return;
1017 }
1018 #endif
1019
1020 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1021
1022 if (dbghelp == NULL) {
1023 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1024 return;
1025 }
1026
1027 _MiniDumpWriteDump =
1028 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1029 PMINIDUMP_EXCEPTION_INFORMATION,
1030 PMINIDUMP_USER_STREAM_INFORMATION,
1031 PMINIDUMP_CALLBACK_INFORMATION),
1032 GetProcAddress(dbghelp,
1033 "MiniDumpWriteDump"));
1034
1035 if (_MiniDumpWriteDump == NULL) {
1036 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1037 return;
1038 }
1039
1040 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1041
1042 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1043 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1044 #if API_VERSION_NUMBER >= 11
1045 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1046 MiniDumpWithUnloadedModules);
1047 #endif
1048
1049 cwd = get_current_directory(NULL, 0);
1050 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id());
1051 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1052
1053 if (dumpFile == INVALID_HANDLE_VALUE) {
1054 VMError::report_coredump_status("Failed to create file for dumping", false);
1055 return;
1056 }
1057 if (exceptionRecord != NULL && contextRecord != NULL) {
1058 ep.ContextRecord = (PCONTEXT) contextRecord;
1059 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1060
1061 mei.ThreadId = GetCurrentThreadId();
1062 mei.ExceptionPointers = &ep;
1063 pmei = &mei;
1064 } else {
1065 pmei = NULL;
1066 }
1067
1068
1069 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1070 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1071 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1072 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1073 DWORD error = GetLastError();
1074 LPTSTR msgbuf = NULL;
1075
1076 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1077 FORMAT_MESSAGE_FROM_SYSTEM |
1078 FORMAT_MESSAGE_IGNORE_INSERTS,
1079 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1080
1081 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1082 LocalFree(msgbuf);
1083 } else {
1084 // Call to FormatMessage failed, just include the result from GetLastError
1085 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1086 }
1087 VMError::report_coredump_status(buffer, false);
1088 } else {
1089 VMError::report_coredump_status(buffer, true);
1090 }
1091
1092 CloseHandle(dumpFile);
1093 }
1094
1095
1096 void os::abort(bool dump_core) {
1097 os::shutdown();
1098 // no core dump on Windows
1099 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1100 }
1101
1102 // Die immediately, no exit hook, no abort hook, no cleanup.
1103 void os::die() {
1104 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1105 }
1106
1107 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1108 // * dirent_md.c 1.15 00/02/02
1109 //
1110 // The declarations for DIR and struct dirent are in jvm_win32.h.
1111
1112 // Caller must have already run dirname through JVM_NativePath, which removes
1113 // duplicate slashes and converts all instances of '/' into '\\'.
1114
1115 DIR * os::opendir(const char *dirname) {
1116 assert(dirname != NULL, "just checking"); // hotspot change
1117 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1118 DWORD fattr; // hotspot change
1119 char alt_dirname[4] = { 0, 0, 0, 0 };
1120
1121 if (dirp == 0) {
1122 errno = ENOMEM;
1123 return 0;
1124 }
1125
1126 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1127 // as a directory in FindFirstFile(). We detect this case here and
1128 // prepend the current drive name.
1129 //
1130 if (dirname[1] == '\0' && dirname[0] == '\\') {
1131 alt_dirname[0] = _getdrive() + 'A' - 1;
1132 alt_dirname[1] = ':';
1133 alt_dirname[2] = '\\';
1134 alt_dirname[3] = '\0';
1135 dirname = alt_dirname;
1136 }
1137
1138 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1139 if (dirp->path == 0) {
1140 free(dirp);
1141 errno = ENOMEM;
1142 return 0;
1143 }
1144 strcpy(dirp->path, dirname);
1145
1146 fattr = GetFileAttributes(dirp->path);
1147 if (fattr == 0xffffffff) {
1148 free(dirp->path);
1149 free(dirp);
1150 errno = ENOENT;
1151 return 0;
1152 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1153 free(dirp->path);
1154 free(dirp);
1155 errno = ENOTDIR;
1156 return 0;
1157 }
1158
1159 // Append "*.*", or possibly "\\*.*", to path
1160 if (dirp->path[1] == ':' &&
1161 (dirp->path[2] == '\0' ||
1162 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1163 // No '\\' needed for cases like "Z:" or "Z:\"
1164 strcat(dirp->path, "*.*");
1165 } else {
1166 strcat(dirp->path, "\\*.*");
1167 }
1168
1169 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1170 if (dirp->handle == INVALID_HANDLE_VALUE) {
1171 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1172 free(dirp->path);
1173 free(dirp);
1174 errno = EACCES;
1175 return 0;
1176 }
1177 }
1178 return dirp;
1179 }
1180
1181 // parameter dbuf unused on Windows
1182 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1183 assert(dirp != NULL, "just checking"); // hotspot change
1184 if (dirp->handle == INVALID_HANDLE_VALUE) {
1185 return 0;
1186 }
1187
1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1189
1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1191 if (GetLastError() == ERROR_INVALID_HANDLE) {
1192 errno = EBADF;
1193 return 0;
1194 }
1195 FindClose(dirp->handle);
1196 dirp->handle = INVALID_HANDLE_VALUE;
1197 }
1198
1199 return &dirp->dirent;
1200 }
1201
1202 int os::closedir(DIR *dirp) {
1203 assert(dirp != NULL, "just checking"); // hotspot change
1204 if (dirp->handle != INVALID_HANDLE_VALUE) {
1205 if (!FindClose(dirp->handle)) {
1206 errno = EBADF;
1207 return -1;
1208 }
1209 dirp->handle = INVALID_HANDLE_VALUE;
1210 }
1211 free(dirp->path);
1212 free(dirp);
1213 return 0;
1214 }
1215
1216 // This must be hard coded because it's the system's temporary
1217 // directory not the java application's temp directory, ala java.io.tmpdir.
1218 const char* os::get_temp_directory() {
1219 static char path_buf[MAX_PATH];
1220 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1221 return path_buf;
1222 } else {
1223 path_buf[0] = '\0';
1224 return path_buf;
1225 }
1226 }
1227
1228 static bool file_exists(const char* filename) {
1229 if (filename == NULL || strlen(filename) == 0) {
1230 return false;
1231 }
1232 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1233 }
1234
1235 bool os::dll_build_name(char *buffer, size_t buflen,
1236 const char* pname, const char* fname) {
1237 bool retval = false;
1238 const size_t pnamelen = pname ? strlen(pname) : 0;
1239 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1240
1241 // Return error on buffer overflow.
1242 if (pnamelen + strlen(fname) + 10 > buflen) {
1243 return retval;
1244 }
1245
1246 if (pnamelen == 0) {
1247 jio_snprintf(buffer, buflen, "%s.dll", fname);
1248 retval = true;
1249 } else if (c == ':' || c == '\\') {
1250 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1251 retval = true;
1252 } else if (strchr(pname, *os::path_separator()) != NULL) {
1253 int n;
1254 char** pelements = split_path(pname, &n);
1255 if (pelements == NULL) {
1256 return false;
1257 }
1258 for (int i = 0; i < n; i++) {
1259 char* path = pelements[i];
1260 // Really shouldn't be NULL, but check can't hurt
1261 size_t plen = (path == NULL) ? 0 : strlen(path);
1262 if (plen == 0) {
1263 continue; // skip the empty path values
1264 }
1265 const char lastchar = path[plen - 1];
1266 if (lastchar == ':' || lastchar == '\\') {
1267 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1268 } else {
1269 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1270 }
1271 if (file_exists(buffer)) {
1272 retval = true;
1273 break;
1274 }
1275 }
1276 // release the storage
1277 for (int i = 0; i < n; i++) {
1278 if (pelements[i] != NULL) {
1279 FREE_C_HEAP_ARRAY(char, pelements[i]);
1280 }
1281 }
1282 if (pelements != NULL) {
1283 FREE_C_HEAP_ARRAY(char*, pelements);
1284 }
1285 } else {
1286 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1287 retval = true;
1288 }
1289 return retval;
1290 }
1291
1292 // Needs to be in os specific directory because windows requires another
1293 // header file <direct.h>
1294 const char* os::get_current_directory(char *buf, size_t buflen) {
1295 int n = static_cast<int>(buflen);
1296 if (buflen > INT_MAX) n = INT_MAX;
1297 return _getcwd(buf, n);
1298 }
1299
1300 //-----------------------------------------------------------
1301 // Helper functions for fatal error handler
1302 #ifdef _WIN64
1303 // Helper routine which returns true if address in
1304 // within the NTDLL address space.
1305 //
1306 static bool _addr_in_ntdll(address addr) {
1307 HMODULE hmod;
1308 MODULEINFO minfo;
1309
1310 hmod = GetModuleHandle("NTDLL.DLL");
1311 if (hmod == NULL) return false;
1312 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1313 &minfo, sizeof(MODULEINFO))) {
1314 return false;
1315 }
1316
1317 if ((addr >= minfo.lpBaseOfDll) &&
1318 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1319 return true;
1320 } else {
1321 return false;
1322 }
1323 }
1324 #endif
1325
1326 struct _modinfo {
1327 address addr;
1328 char* full_path; // point to a char buffer
1329 int buflen; // size of the buffer
1330 address base_addr;
1331 };
1332
1333 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1334 address top_address, void * param) {
1335 struct _modinfo *pmod = (struct _modinfo *)param;
1336 if (!pmod) return -1;
1337
1338 if (base_addr <= pmod->addr &&
1339 top_address > pmod->addr) {
1340 // if a buffer is provided, copy path name to the buffer
1341 if (pmod->full_path) {
1342 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1343 }
1344 pmod->base_addr = base_addr;
1345 return 1;
1346 }
1347 return 0;
1348 }
1349
1350 bool os::dll_address_to_library_name(address addr, char* buf,
1351 int buflen, int* offset) {
1352 // buf is not optional, but offset is optional
1353 assert(buf != NULL, "sanity check");
1354
1355 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1356 // return the full path to the DLL file, sometimes it returns path
1357 // to the corresponding PDB file (debug info); sometimes it only
1358 // returns partial path, which makes life painful.
1359
1360 struct _modinfo mi;
1361 mi.addr = addr;
1362 mi.full_path = buf;
1363 mi.buflen = buflen;
1364 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1365 // buf already contains path name
1366 if (offset) *offset = addr - mi.base_addr;
1367 return true;
1368 }
1369
1370 buf[0] = '\0';
1371 if (offset) *offset = -1;
1372 return false;
1373 }
1374
1375 bool os::dll_address_to_function_name(address addr, char *buf,
1376 int buflen, int *offset) {
1377 // buf is not optional, but offset is optional
1378 assert(buf != NULL, "sanity check");
1379
1380 if (Decoder::decode(addr, buf, buflen, offset)) {
1381 return true;
1382 }
1383 if (offset != NULL) *offset = -1;
1384 buf[0] = '\0';
1385 return false;
1386 }
1387
1388 // save the start and end address of jvm.dll into param[0] and param[1]
1389 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1390 address top_address, void * param) {
1391 if (!param) return -1;
1392
1393 if (base_addr <= (address)_locate_jvm_dll &&
1394 top_address > (address)_locate_jvm_dll) {
1395 ((address*)param)[0] = base_addr;
1396 ((address*)param)[1] = top_address;
1397 return 1;
1398 }
1399 return 0;
1400 }
1401
1402 address vm_lib_location[2]; // start and end address of jvm.dll
1403
1404 // check if addr is inside jvm.dll
1405 bool os::address_is_in_vm(address addr) {
1406 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1408 assert(false, "Can't find jvm module.");
1409 return false;
1410 }
1411 }
1412
1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1414 }
1415
1416 // print module info; param is outputStream*
1417 static int _print_module(const char* fname, address base_address,
1418 address top_address, void* param) {
1419 if (!param) return -1;
1420
1421 outputStream* st = (outputStream*)param;
1422
1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1424 return 0;
1425 }
1426
1427 // Loads .dll/.so and
1428 // in case of error it checks if .dll/.so was built for the
1429 // same architecture as Hotspot is running on
1430 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1431 void * result = LoadLibrary(name);
1432 if (result != NULL) {
1433 return result;
1434 }
1435
1436 DWORD errcode = GetLastError();
1437 if (errcode == ERROR_MOD_NOT_FOUND) {
1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1439 ebuf[ebuflen - 1] = '\0';
1440 return NULL;
1441 }
1442
1443 // Parsing dll below
1444 // If we can read dll-info and find that dll was built
1445 // for an architecture other than Hotspot is running in
1446 // - then print to buffer "DLL was built for a different architecture"
1447 // else call os::lasterror to obtain system error message
1448
1449 // Read system error message into ebuf
1450 // It may or may not be overwritten below (in the for loop and just above)
1451 lasterror(ebuf, (size_t) ebuflen);
1452 ebuf[ebuflen - 1] = '\0';
1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1454 if (fd < 0) {
1455 return NULL;
1456 }
1457
1458 uint32_t signature_offset;
1459 uint16_t lib_arch = 0;
1460 bool failed_to_get_lib_arch =
1461 ( // Go to position 3c in the dll
1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1463 ||
1464 // Read location of signature
1465 (sizeof(signature_offset) !=
1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1467 ||
1468 // Go to COFF File Header in dll
1469 // that is located after "signature" (4 bytes long)
1470 (os::seek_to_file_offset(fd,
1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1472 ||
1473 // Read field that contains code of architecture
1474 // that dll was built for
1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1476 );
1477
1478 ::close(fd);
1479 if (failed_to_get_lib_arch) {
1480 // file i/o error - report os::lasterror(...) msg
1481 return NULL;
1482 }
1483
1484 typedef struct {
1485 uint16_t arch_code;
1486 char* arch_name;
1487 } arch_t;
1488
1489 static const arch_t arch_array[] = {
1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1493 };
1494 #if (defined _M_IA64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1496 #elif (defined _M_AMD64)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1498 #elif (defined _M_IX86)
1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1500 #else
1501 #error Method os::dll_load requires that one of following \
1502 is defined :_M_IA64,_M_AMD64 or _M_IX86
1503 #endif
1504
1505
1506 // Obtain a string for printf operation
1507 // lib_arch_str shall contain string what platform this .dll was built for
1508 // running_arch_str shall string contain what platform Hotspot was built for
1509 char *running_arch_str = NULL, *lib_arch_str = NULL;
1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1511 if (lib_arch == arch_array[i].arch_code) {
1512 lib_arch_str = arch_array[i].arch_name;
1513 }
1514 if (running_arch == arch_array[i].arch_code) {
1515 running_arch_str = arch_array[i].arch_name;
1516 }
1517 }
1518
1519 assert(running_arch_str,
1520 "Didn't find running architecture code in arch_array");
1521
1522 // If the architecture is right
1523 // but some other error took place - report os::lasterror(...) msg
1524 if (lib_arch == running_arch) {
1525 return NULL;
1526 }
1527
1528 if (lib_arch_str != NULL) {
1529 ::_snprintf(ebuf, ebuflen - 1,
1530 "Can't load %s-bit .dll on a %s-bit platform",
1531 lib_arch_str, running_arch_str);
1532 } else {
1533 // don't know what architecture this dll was build for
1534 ::_snprintf(ebuf, ebuflen - 1,
1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1536 lib_arch, running_arch_str);
1537 }
1538
1539 return NULL;
1540 }
1541
1542 void os::print_dll_info(outputStream *st) {
1543 st->print_cr("Dynamic libraries:");
1544 get_loaded_modules_info(_print_module, (void *)st);
1545 }
1546
1547 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1548 HANDLE hProcess;
1549
1550 # define MAX_NUM_MODULES 128
1551 HMODULE modules[MAX_NUM_MODULES];
1552 static char filename[MAX_PATH];
1553 int result = 0;
1554
1555 if (!os::PSApiDll::PSApiAvailable()) {
1556 return 0;
1557 }
1558
1559 int pid = os::current_process_id();
1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1561 FALSE, pid);
1562 if (hProcess == NULL) return 0;
1563
1564 DWORD size_needed;
1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1566 sizeof(modules), &size_needed)) {
1567 CloseHandle(hProcess);
1568 return 0;
1569 }
1570
1571 // number of modules that are currently loaded
1572 int num_modules = size_needed / sizeof(HMODULE);
1573
1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1575 // Get Full pathname:
1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1577 filename, sizeof(filename))) {
1578 filename[0] = '\0';
1579 }
1580
1581 MODULEINFO modinfo;
1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1583 &modinfo, sizeof(modinfo))) {
1584 modinfo.lpBaseOfDll = NULL;
1585 modinfo.SizeOfImage = 0;
1586 }
1587
1588 // Invoke callback function
1589 result = callback(filename, (address)modinfo.lpBaseOfDll,
1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1591 if (result) break;
1592 }
1593
1594 CloseHandle(hProcess);
1595 return result;
1596 }
1597
1598 void os::print_os_info_brief(outputStream* st) {
1599 os::print_os_info(st);
1600 }
1601
1602 void os::print_os_info(outputStream* st) {
1603 #ifdef ASSERT
1604 char buffer[1024];
1605 DWORD size = sizeof(buffer);
1606 st->print(" HostName: ");
1607 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1608 st->print("%s", buffer);
1609 } else {
1610 st->print("N/A");
1611 }
1612 #endif
1613 st->print(" OS:");
1614 os::win32::print_windows_version(st);
1615 }
1616
1617 void os::win32::print_windows_version(outputStream* st) {
1618 OSVERSIONINFOEX osvi;
1619 VS_FIXEDFILEINFO *file_info;
1620 TCHAR kernel32_path[MAX_PATH];
1621 UINT len, ret;
1622
1623 // Use the GetVersionEx information to see if we're on a server or
1624 // workstation edition of Windows. Starting with Windows 8.1 we can't
1625 // trust the OS version information returned by this API.
1626 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1627 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1628 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1629 st->print_cr("Call to GetVersionEx failed");
1630 return;
1631 }
1632 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1633
1634 // Get the full path to \Windows\System32\kernel32.dll and use that for
1635 // determining what version of Windows we're running on.
1636 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1637 ret = GetSystemDirectory(kernel32_path, len);
1638 if (ret == 0 || ret > len) {
1639 st->print_cr("Call to GetSystemDirectory failed");
1640 return;
1641 }
1642 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1643
1644 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1645 if (version_size == 0) {
1646 st->print_cr("Call to GetFileVersionInfoSize failed");
1647 return;
1648 }
1649
1650 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1651 if (version_info == NULL) {
1652 st->print_cr("Failed to allocate version_info");
1653 return;
1654 }
1655
1656 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1657 os::free(version_info);
1658 st->print_cr("Call to GetFileVersionInfo failed");
1659 return;
1660 }
1661
1662 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1663 os::free(version_info);
1664 st->print_cr("Call to VerQueryValue failed");
1665 return;
1666 }
1667
1668 int major_version = HIWORD(file_info->dwProductVersionMS);
1669 int minor_version = LOWORD(file_info->dwProductVersionMS);
1670 int build_number = HIWORD(file_info->dwProductVersionLS);
1671 int build_minor = LOWORD(file_info->dwProductVersionLS);
1672 int os_vers = major_version * 1000 + minor_version;
1673 os::free(version_info);
1674
1675 st->print(" Windows ");
1676 switch (os_vers) {
1677
1678 case 6000:
1679 if (is_workstation) {
1680 st->print("Vista");
1681 } else {
1682 st->print("Server 2008");
1683 }
1684 break;
1685
1686 case 6001:
1687 if (is_workstation) {
1688 st->print("7");
1689 } else {
1690 st->print("Server 2008 R2");
1691 }
1692 break;
1693
1694 case 6002:
1695 if (is_workstation) {
1696 st->print("8");
1697 } else {
1698 st->print("Server 2012");
1699 }
1700 break;
1701
1702 case 6003:
1703 if (is_workstation) {
1704 st->print("8.1");
1705 } else {
1706 st->print("Server 2012 R2");
1707 }
1708 break;
1709
1710 case 10000:
1711 if (is_workstation) {
1712 st->print("10");
1713 } else {
1714 // The server version name of Windows 10 is not known at this time
1715 st->print("%d.%d", major_version, minor_version);
1716 }
1717 break;
1718
1719 default:
1720 // Unrecognized windows, print out its major and minor versions
1721 st->print("%d.%d", major_version, minor_version);
1722 break;
1723 }
1724
1725 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1726 // find out whether we are running on 64 bit processor or not
1727 SYSTEM_INFO si;
1728 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1729 os::Kernel32Dll::GetNativeSystemInfo(&si);
1730 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1731 st->print(" , 64 bit");
1732 }
1733
1734 st->print(" Build %d", build_number);
1735 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1736 st->cr();
1737 }
1738
1739 void os::pd_print_cpu_info(outputStream* st) {
1740 // Nothing to do for now.
1741 }
1742
1743 void os::print_memory_info(outputStream* st) {
1744 st->print("Memory:");
1745 st->print(" %dk page", os::vm_page_size()>>10);
1746
1747 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1748 // value if total memory is larger than 4GB
1749 MEMORYSTATUSEX ms;
1750 ms.dwLength = sizeof(ms);
1751 GlobalMemoryStatusEx(&ms);
1752
1753 st->print(", physical %uk", os::physical_memory() >> 10);
1754 st->print("(%uk free)", os::available_memory() >> 10);
1755
1756 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1757 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1758 st->cr();
1759 }
1760
1761 void os::print_siginfo(outputStream *st, void *siginfo) {
1762 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1763 st->print("siginfo:");
1764 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1765
1766 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1767 er->NumberParameters >= 2) {
1768 switch (er->ExceptionInformation[0]) {
1769 case 0: st->print(", reading address"); break;
1770 case 1: st->print(", writing address"); break;
1771 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1772 er->ExceptionInformation[0]);
1773 }
1774 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1775 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1776 er->NumberParameters >= 2 && UseSharedSpaces) {
1777 FileMapInfo* mapinfo = FileMapInfo::current_info();
1778 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1779 st->print("\n\nError accessing class data sharing archive." \
1780 " Mapped file inaccessible during execution, " \
1781 " possible disk/network problem.");
1782 }
1783 } else {
1784 int num = er->NumberParameters;
1785 if (num > 0) {
1786 st->print(", ExceptionInformation=");
1787 for (int i = 0; i < num; i++) {
1788 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1789 }
1790 }
1791 }
1792 st->cr();
1793 }
1794
1795 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1796 // do nothing
1797 }
1798
1799 static char saved_jvm_path[MAX_PATH] = {0};
1800
1801 // Find the full path to the current module, jvm.dll
1802 void os::jvm_path(char *buf, jint buflen) {
1803 // Error checking.
1804 if (buflen < MAX_PATH) {
1805 assert(false, "must use a large-enough buffer");
1806 buf[0] = '\0';
1807 return;
1808 }
1809 // Lazy resolve the path to current module.
1810 if (saved_jvm_path[0] != 0) {
1811 strcpy(buf, saved_jvm_path);
1812 return;
1813 }
1814
1815 buf[0] = '\0';
1816 if (Arguments::sun_java_launcher_is_altjvm()) {
1817 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1818 // for a JAVA_HOME environment variable and fix up the path so it
1819 // looks like jvm.dll is installed there (append a fake suffix
1820 // hotspot/jvm.dll).
1821 char* java_home_var = ::getenv("JAVA_HOME");
1822 if (java_home_var != NULL && java_home_var[0] != 0 &&
1823 strlen(java_home_var) < (size_t)buflen) {
1824 strncpy(buf, java_home_var, buflen);
1825
1826 // determine if this is a legacy image or modules image
1827 // modules image doesn't have "jre" subdirectory
1828 size_t len = strlen(buf);
1829 char* jrebin_p = buf + len;
1830 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1831 if (0 != _access(buf, 0)) {
1832 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1833 }
1834 len = strlen(buf);
1835 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1836 }
1837 }
1838
1839 if (buf[0] == '\0') {
1840 GetModuleFileName(vm_lib_handle, buf, buflen);
1841 }
1842 strncpy(saved_jvm_path, buf, MAX_PATH);
1843 saved_jvm_path[MAX_PATH - 1] = '\0';
1844 }
1845
1846
1847 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1848 #ifndef _WIN64
1849 st->print("_");
1850 #endif
1851 }
1852
1853
1854 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1855 #ifndef _WIN64
1856 st->print("@%d", args_size * sizeof(int));
1857 #endif
1858 }
1859
1860 // This method is a copy of JDK's sysGetLastErrorString
1861 // from src/windows/hpi/src/system_md.c
1862
1863 size_t os::lasterror(char* buf, size_t len) {
1864 DWORD errval;
1865
1866 if ((errval = GetLastError()) != 0) {
1867 // DOS error
1868 size_t n = (size_t)FormatMessage(
1869 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1870 NULL,
1871 errval,
1872 0,
1873 buf,
1874 (DWORD)len,
1875 NULL);
1876 if (n > 3) {
1877 // Drop final '.', CR, LF
1878 if (buf[n - 1] == '\n') n--;
1879 if (buf[n - 1] == '\r') n--;
1880 if (buf[n - 1] == '.') n--;
1881 buf[n] = '\0';
1882 }
1883 return n;
1884 }
1885
1886 if (errno != 0) {
1887 // C runtime error that has no corresponding DOS error code
1888 const char* s = strerror(errno);
1889 size_t n = strlen(s);
1890 if (n >= len) n = len - 1;
1891 strncpy(buf, s, n);
1892 buf[n] = '\0';
1893 return n;
1894 }
1895
1896 return 0;
1897 }
1898
1899 int os::get_last_error() {
1900 DWORD error = GetLastError();
1901 if (error == 0) {
1902 error = errno;
1903 }
1904 return (int)error;
1905 }
1906
1907 // sun.misc.Signal
1908 // NOTE that this is a workaround for an apparent kernel bug where if
1909 // a signal handler for SIGBREAK is installed then that signal handler
1910 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1911 // See bug 4416763.
1912 static void (*sigbreakHandler)(int) = NULL;
1913
1914 static void UserHandler(int sig, void *siginfo, void *context) {
1915 os::signal_notify(sig);
1916 // We need to reinstate the signal handler each time...
1917 os::signal(sig, (void*)UserHandler);
1918 }
1919
1920 void* os::user_handler() {
1921 return (void*) UserHandler;
1922 }
1923
1924 void* os::signal(int signal_number, void* handler) {
1925 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1926 void (*oldHandler)(int) = sigbreakHandler;
1927 sigbreakHandler = (void (*)(int)) handler;
1928 return (void*) oldHandler;
1929 } else {
1930 return (void*)::signal(signal_number, (void (*)(int))handler);
1931 }
1932 }
1933
1934 void os::signal_raise(int signal_number) {
1935 raise(signal_number);
1936 }
1937
1938 // The Win32 C runtime library maps all console control events other than ^C
1939 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1940 // logoff, and shutdown events. We therefore install our own console handler
1941 // that raises SIGTERM for the latter cases.
1942 //
1943 static BOOL WINAPI consoleHandler(DWORD event) {
1944 switch (event) {
1945 case CTRL_C_EVENT:
1946 if (is_error_reported()) {
1947 // Ctrl-C is pressed during error reporting, likely because the error
1948 // handler fails to abort. Let VM die immediately.
1949 os::die();
1950 }
1951
1952 os::signal_raise(SIGINT);
1953 return TRUE;
1954 break;
1955 case CTRL_BREAK_EVENT:
1956 if (sigbreakHandler != NULL) {
1957 (*sigbreakHandler)(SIGBREAK);
1958 }
1959 return TRUE;
1960 break;
1961 case CTRL_LOGOFF_EVENT: {
1962 // Don't terminate JVM if it is running in a non-interactive session,
1963 // such as a service process.
1964 USEROBJECTFLAGS flags;
1965 HANDLE handle = GetProcessWindowStation();
1966 if (handle != NULL &&
1967 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1968 sizeof(USEROBJECTFLAGS), NULL)) {
1969 // If it is a non-interactive session, let next handler to deal
1970 // with it.
1971 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1972 return FALSE;
1973 }
1974 }
1975 }
1976 case CTRL_CLOSE_EVENT:
1977 case CTRL_SHUTDOWN_EVENT:
1978 os::signal_raise(SIGTERM);
1979 return TRUE;
1980 break;
1981 default:
1982 break;
1983 }
1984 return FALSE;
1985 }
1986
1987 // The following code is moved from os.cpp for making this
1988 // code platform specific, which it is by its very nature.
1989
1990 // Return maximum OS signal used + 1 for internal use only
1991 // Used as exit signal for signal_thread
1992 int os::sigexitnum_pd() {
1993 return NSIG;
1994 }
1995
1996 // a counter for each possible signal value, including signal_thread exit signal
1997 static volatile jint pending_signals[NSIG+1] = { 0 };
1998 static HANDLE sig_sem = NULL;
1999
2000 void os::signal_init_pd() {
2001 // Initialize signal structures
2002 memset((void*)pending_signals, 0, sizeof(pending_signals));
2003
2004 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2005
2006 // Programs embedding the VM do not want it to attempt to receive
2007 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2008 // shutdown hooks mechanism introduced in 1.3. For example, when
2009 // the VM is run as part of a Windows NT service (i.e., a servlet
2010 // engine in a web server), the correct behavior is for any console
2011 // control handler to return FALSE, not TRUE, because the OS's
2012 // "final" handler for such events allows the process to continue if
2013 // it is a service (while terminating it if it is not a service).
2014 // To make this behavior uniform and the mechanism simpler, we
2015 // completely disable the VM's usage of these console events if -Xrs
2016 // (=ReduceSignalUsage) is specified. This means, for example, that
2017 // the CTRL-BREAK thread dump mechanism is also disabled in this
2018 // case. See bugs 4323062, 4345157, and related bugs.
2019
2020 if (!ReduceSignalUsage) {
2021 // Add a CTRL-C handler
2022 SetConsoleCtrlHandler(consoleHandler, TRUE);
2023 }
2024 }
2025
2026 void os::signal_notify(int signal_number) {
2027 BOOL ret;
2028 if (sig_sem != NULL) {
2029 Atomic::inc(&pending_signals[signal_number]);
2030 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2031 assert(ret != 0, "ReleaseSemaphore() failed");
2032 }
2033 }
2034
2035 static int check_pending_signals(bool wait_for_signal) {
2036 DWORD ret;
2037 while (true) {
2038 for (int i = 0; i < NSIG + 1; i++) {
2039 jint n = pending_signals[i];
2040 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2041 return i;
2042 }
2043 }
2044 if (!wait_for_signal) {
2045 return -1;
2046 }
2047
2048 JavaThread *thread = JavaThread::current();
2049
2050 ThreadBlockInVM tbivm(thread);
2051
2052 bool threadIsSuspended;
2053 do {
2054 thread->set_suspend_equivalent();
2055 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2056 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2057 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2058
2059 // were we externally suspended while we were waiting?
2060 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2061 if (threadIsSuspended) {
2062 // The semaphore has been incremented, but while we were waiting
2063 // another thread suspended us. We don't want to continue running
2064 // while suspended because that would surprise the thread that
2065 // suspended us.
2066 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2067 assert(ret != 0, "ReleaseSemaphore() failed");
2068
2069 thread->java_suspend_self();
2070 }
2071 } while (threadIsSuspended);
2072 }
2073 }
2074
2075 int os::signal_lookup() {
2076 return check_pending_signals(false);
2077 }
2078
2079 int os::signal_wait() {
2080 return check_pending_signals(true);
2081 }
2082
2083 // Implicit OS exception handling
2084
2085 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2086 address handler) {
2087 JavaThread* thread = JavaThread::current();
2088 // Save pc in thread
2089 #ifdef _M_IA64
2090 // Do not blow up if no thread info available.
2091 if (thread) {
2092 // Saving PRECISE pc (with slot information) in thread.
2093 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2094 // Convert precise PC into "Unix" format
2095 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2096 thread->set_saved_exception_pc((address)precise_pc);
2097 }
2098 // Set pc to handler
2099 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2100 // Clear out psr.ri (= Restart Instruction) in order to continue
2101 // at the beginning of the target bundle.
2102 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2103 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2104 #elif _M_AMD64
2105 // Do not blow up if no thread info available.
2106 if (thread) {
2107 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2108 }
2109 // Set pc to handler
2110 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2111 #else
2112 // Do not blow up if no thread info available.
2113 if (thread) {
2114 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2115 }
2116 // Set pc to handler
2117 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2118 #endif
2119
2120 // Continue the execution
2121 return EXCEPTION_CONTINUE_EXECUTION;
2122 }
2123
2124
2125 // Used for PostMortemDump
2126 extern "C" void safepoints();
2127 extern "C" void find(int x);
2128 extern "C" void events();
2129
2130 // According to Windows API documentation, an illegal instruction sequence should generate
2131 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2132 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2133 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2134
2135 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2136
2137 // From "Execution Protection in the Windows Operating System" draft 0.35
2138 // Once a system header becomes available, the "real" define should be
2139 // included or copied here.
2140 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2141
2142 // Handle NAT Bit consumption on IA64.
2143 #ifdef _M_IA64
2144 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2145 #endif
2146
2147 // Windows Vista/2008 heap corruption check
2148 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2149
2150 #define def_excpt(val) #val, val
2151
2152 struct siglabel {
2153 char *name;
2154 int number;
2155 };
2156
2157 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2158 // C++ compiler contain this error code. Because this is a compiler-generated
2159 // error, the code is not listed in the Win32 API header files.
2160 // The code is actually a cryptic mnemonic device, with the initial "E"
2161 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2162 // ASCII values of "msc".
2163
2164 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2165
2166
2167 struct siglabel exceptlabels[] = {
2168 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2169 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2170 def_excpt(EXCEPTION_BREAKPOINT),
2171 def_excpt(EXCEPTION_SINGLE_STEP),
2172 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2173 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2174 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2175 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2176 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2177 def_excpt(EXCEPTION_FLT_OVERFLOW),
2178 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2179 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2180 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2181 def_excpt(EXCEPTION_INT_OVERFLOW),
2182 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2183 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2184 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2185 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2186 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2187 def_excpt(EXCEPTION_STACK_OVERFLOW),
2188 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2189 def_excpt(EXCEPTION_GUARD_PAGE),
2190 def_excpt(EXCEPTION_INVALID_HANDLE),
2191 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2192 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2193 #ifdef _M_IA64
2194 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2195 #endif
2196 NULL, 0
2197 };
2198
2199 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2200 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2201 if (exceptlabels[i].number == exception_code) {
2202 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2203 return buf;
2204 }
2205 }
2206
2207 return NULL;
2208 }
2209
2210 //-----------------------------------------------------------------------------
2211 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2212 // handle exception caused by idiv; should only happen for -MinInt/-1
2213 // (division by zero is handled explicitly)
2214 #ifdef _M_IA64
2215 assert(0, "Fix Handle_IDiv_Exception");
2216 #elif _M_AMD64
2217 PCONTEXT ctx = exceptionInfo->ContextRecord;
2218 address pc = (address)ctx->Rip;
2219 assert(pc[0] == 0xF7, "not an idiv opcode");
2220 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2221 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2222 // set correct result values and continue after idiv instruction
2223 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2224 ctx->Rax = (DWORD)min_jint; // result
2225 ctx->Rdx = (DWORD)0; // remainder
2226 // Continue the execution
2227 #else
2228 PCONTEXT ctx = exceptionInfo->ContextRecord;
2229 address pc = (address)ctx->Eip;
2230 assert(pc[0] == 0xF7, "not an idiv opcode");
2231 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2232 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2233 // set correct result values and continue after idiv instruction
2234 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2235 ctx->Eax = (DWORD)min_jint; // result
2236 ctx->Edx = (DWORD)0; // remainder
2237 // Continue the execution
2238 #endif
2239 return EXCEPTION_CONTINUE_EXECUTION;
2240 }
2241
2242 //-----------------------------------------------------------------------------
2243 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2244 PCONTEXT ctx = exceptionInfo->ContextRecord;
2245 #ifndef _WIN64
2246 // handle exception caused by native method modifying control word
2247 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2248
2249 switch (exception_code) {
2250 case EXCEPTION_FLT_DENORMAL_OPERAND:
2251 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2252 case EXCEPTION_FLT_INEXACT_RESULT:
2253 case EXCEPTION_FLT_INVALID_OPERATION:
2254 case EXCEPTION_FLT_OVERFLOW:
2255 case EXCEPTION_FLT_STACK_CHECK:
2256 case EXCEPTION_FLT_UNDERFLOW:
2257 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2258 if (fp_control_word != ctx->FloatSave.ControlWord) {
2259 // Restore FPCW and mask out FLT exceptions
2260 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2261 // Mask out pending FLT exceptions
2262 ctx->FloatSave.StatusWord &= 0xffffff00;
2263 return EXCEPTION_CONTINUE_EXECUTION;
2264 }
2265 }
2266
2267 if (prev_uef_handler != NULL) {
2268 // We didn't handle this exception so pass it to the previous
2269 // UnhandledExceptionFilter.
2270 return (prev_uef_handler)(exceptionInfo);
2271 }
2272 #else // !_WIN64
2273 // On Windows, the mxcsr control bits are non-volatile across calls
2274 // See also CR 6192333
2275 //
2276 jint MxCsr = INITIAL_MXCSR;
2277 // we can't use StubRoutines::addr_mxcsr_std()
2278 // because in Win64 mxcsr is not saved there
2279 if (MxCsr != ctx->MxCsr) {
2280 ctx->MxCsr = MxCsr;
2281 return EXCEPTION_CONTINUE_EXECUTION;
2282 }
2283 #endif // !_WIN64
2284
2285 return EXCEPTION_CONTINUE_SEARCH;
2286 }
2287
2288 static inline void report_error(Thread* t, DWORD exception_code,
2289 address addr, void* siginfo, void* context) {
2290 VMError err(t, exception_code, addr, siginfo, context);
2291 err.report_and_die();
2292
2293 // If UseOsErrorReporting, this will return here and save the error file
2294 // somewhere where we can find it in the minidump.
2295 }
2296
2297 //-----------------------------------------------------------------------------
2298 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2299 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2300 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2301 #ifdef _M_IA64
2302 // On Itanium, we need the "precise pc", which has the slot number coded
2303 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2304 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2305 // Convert the pc to "Unix format", which has the slot number coded
2306 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2307 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2308 // information is saved in the Unix format.
2309 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2310 #elif _M_AMD64
2311 address pc = (address) exceptionInfo->ContextRecord->Rip;
2312 #else
2313 address pc = (address) exceptionInfo->ContextRecord->Eip;
2314 #endif
2315 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2316
2317 // Handle SafeFetch32 and SafeFetchN exceptions.
2318 if (StubRoutines::is_safefetch_fault(pc)) {
2319 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2320 }
2321
2322 #ifndef _WIN64
2323 // Execution protection violation - win32 running on AMD64 only
2324 // Handled first to avoid misdiagnosis as a "normal" access violation;
2325 // This is safe to do because we have a new/unique ExceptionInformation
2326 // code for this condition.
2327 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2328 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2329 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2330 address addr = (address) exceptionRecord->ExceptionInformation[1];
2331
2332 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2333 int page_size = os::vm_page_size();
2334
2335 // Make sure the pc and the faulting address are sane.
2336 //
2337 // If an instruction spans a page boundary, and the page containing
2338 // the beginning of the instruction is executable but the following
2339 // page is not, the pc and the faulting address might be slightly
2340 // different - we still want to unguard the 2nd page in this case.
2341 //
2342 // 15 bytes seems to be a (very) safe value for max instruction size.
2343 bool pc_is_near_addr =
2344 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2345 bool instr_spans_page_boundary =
2346 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2347 (intptr_t) page_size) > 0);
2348
2349 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2350 static volatile address last_addr =
2351 (address) os::non_memory_address_word();
2352
2353 // In conservative mode, don't unguard unless the address is in the VM
2354 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2355 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2356
2357 // Set memory to RWX and retry
2358 address page_start =
2359 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2360 bool res = os::protect_memory((char*) page_start, page_size,
2361 os::MEM_PROT_RWX);
2362
2363 if (PrintMiscellaneous && Verbose) {
2364 char buf[256];
2365 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2366 "at " INTPTR_FORMAT
2367 ", unguarding " INTPTR_FORMAT ": %s", addr,
2368 page_start, (res ? "success" : strerror(errno)));
2369 tty->print_raw_cr(buf);
2370 }
2371
2372 // Set last_addr so if we fault again at the same address, we don't
2373 // end up in an endless loop.
2374 //
2375 // There are two potential complications here. Two threads trapping
2376 // at the same address at the same time could cause one of the
2377 // threads to think it already unguarded, and abort the VM. Likely
2378 // very rare.
2379 //
2380 // The other race involves two threads alternately trapping at
2381 // different addresses and failing to unguard the page, resulting in
2382 // an endless loop. This condition is probably even more unlikely
2383 // than the first.
2384 //
2385 // Although both cases could be avoided by using locks or thread
2386 // local last_addr, these solutions are unnecessary complication:
2387 // this handler is a best-effort safety net, not a complete solution.
2388 // It is disabled by default and should only be used as a workaround
2389 // in case we missed any no-execute-unsafe VM code.
2390
2391 last_addr = addr;
2392
2393 return EXCEPTION_CONTINUE_EXECUTION;
2394 }
2395 }
2396
2397 // Last unguard failed or not unguarding
2398 tty->print_raw_cr("Execution protection violation");
2399 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2400 exceptionInfo->ContextRecord);
2401 return EXCEPTION_CONTINUE_SEARCH;
2402 }
2403 }
2404 #endif // _WIN64
2405
2406 // Check to see if we caught the safepoint code in the
2407 // process of write protecting the memory serialization page.
2408 // It write enables the page immediately after protecting it
2409 // so just return.
2410 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2411 JavaThread* thread = (JavaThread*) t;
2412 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2413 address addr = (address) exceptionRecord->ExceptionInformation[1];
2414 if (os::is_memory_serialize_page(thread, addr)) {
2415 // Block current thread until the memory serialize page permission restored.
2416 os::block_on_serialize_page_trap();
2417 return EXCEPTION_CONTINUE_EXECUTION;
2418 }
2419 }
2420
2421 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2422 VM_Version::is_cpuinfo_segv_addr(pc)) {
2423 // Verify that OS save/restore AVX registers.
2424 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2425 }
2426
2427 if (t != NULL && t->is_Java_thread()) {
2428 JavaThread* thread = (JavaThread*) t;
2429 bool in_java = thread->thread_state() == _thread_in_Java;
2430
2431 // Handle potential stack overflows up front.
2432 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2433 if (os::uses_stack_guard_pages()) {
2434 #ifdef _M_IA64
2435 // Use guard page for register stack.
2436 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2437 address addr = (address) exceptionRecord->ExceptionInformation[1];
2438 // Check for a register stack overflow on Itanium
2439 if (thread->addr_inside_register_stack_red_zone(addr)) {
2440 // Fatal red zone violation happens if the Java program
2441 // catches a StackOverflow error and does so much processing
2442 // that it runs beyond the unprotected yellow guard zone. As
2443 // a result, we are out of here.
2444 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2445 } else if(thread->addr_inside_register_stack(addr)) {
2446 // Disable the yellow zone which sets the state that
2447 // we've got a stack overflow problem.
2448 if (thread->stack_yellow_zone_enabled()) {
2449 thread->disable_stack_yellow_zone();
2450 }
2451 // Give us some room to process the exception.
2452 thread->disable_register_stack_guard();
2453 // Tracing with +Verbose.
2454 if (Verbose) {
2455 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2456 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2457 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2458 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2459 thread->register_stack_base(),
2460 thread->register_stack_base() + thread->stack_size());
2461 }
2462
2463 // Reguard the permanent register stack red zone just to be sure.
2464 // We saw Windows silently disabling this without telling us.
2465 thread->enable_register_stack_red_zone();
2466
2467 return Handle_Exception(exceptionInfo,
2468 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2469 }
2470 #endif
2471 if (thread->stack_yellow_zone_enabled()) {
2472 // Yellow zone violation. The o/s has unprotected the first yellow
2473 // zone page for us. Note: must call disable_stack_yellow_zone to
2474 // update the enabled status, even if the zone contains only one page.
2475 thread->disable_stack_yellow_zone();
2476 // If not in java code, return and hope for the best.
2477 return in_java
2478 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2479 : EXCEPTION_CONTINUE_EXECUTION;
2480 } else {
2481 // Fatal red zone violation.
2482 thread->disable_stack_red_zone();
2483 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2484 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2485 exceptionInfo->ContextRecord);
2486 return EXCEPTION_CONTINUE_SEARCH;
2487 }
2488 } else if (in_java) {
2489 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2490 // a one-time-only guard page, which it has released to us. The next
2491 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2492 return Handle_Exception(exceptionInfo,
2493 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2494 } else {
2495 // Can only return and hope for the best. Further stack growth will
2496 // result in an ACCESS_VIOLATION.
2497 return EXCEPTION_CONTINUE_EXECUTION;
2498 }
2499 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2500 // Either stack overflow or null pointer exception.
2501 if (in_java) {
2502 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2503 address addr = (address) exceptionRecord->ExceptionInformation[1];
2504 address stack_end = thread->stack_base() - thread->stack_size();
2505 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2506 // Stack overflow.
2507 assert(!os::uses_stack_guard_pages(),
2508 "should be caught by red zone code above.");
2509 return Handle_Exception(exceptionInfo,
2510 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2511 }
2512 // Check for safepoint polling and implicit null
2513 // We only expect null pointers in the stubs (vtable)
2514 // the rest are checked explicitly now.
2515 CodeBlob* cb = CodeCache::find_blob(pc);
2516 if (cb != NULL) {
2517 if (os::is_poll_address(addr)) {
2518 address stub = SharedRuntime::get_poll_stub(pc);
2519 return Handle_Exception(exceptionInfo, stub);
2520 }
2521 }
2522 {
2523 #ifdef _WIN64
2524 // If it's a legal stack address map the entire region in
2525 //
2526 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2527 address addr = (address) exceptionRecord->ExceptionInformation[1];
2528 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2529 addr = (address)((uintptr_t)addr &
2530 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2531 os::commit_memory((char *)addr, thread->stack_base() - addr,
2532 !ExecMem);
2533 return EXCEPTION_CONTINUE_EXECUTION;
2534 } else
2535 #endif
2536 {
2537 // Null pointer exception.
2538 #ifdef _M_IA64
2539 // Process implicit null checks in compiled code. Note: Implicit null checks
2540 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2541 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2542 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2543 // Handle implicit null check in UEP method entry
2544 if (cb && (cb->is_frame_complete_at(pc) ||
2545 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2546 if (Verbose) {
2547 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2548 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2549 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2550 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2551 *(bundle_start + 1), *bundle_start);
2552 }
2553 return Handle_Exception(exceptionInfo,
2554 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2555 }
2556 }
2557
2558 // Implicit null checks were processed above. Hence, we should not reach
2559 // here in the usual case => die!
2560 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2561 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2562 exceptionInfo->ContextRecord);
2563 return EXCEPTION_CONTINUE_SEARCH;
2564
2565 #else // !IA64
2566
2567 // Windows 98 reports faulting addresses incorrectly
2568 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2569 !os::win32::is_nt()) {
2570 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2571 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2572 }
2573 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2574 exceptionInfo->ContextRecord);
2575 return EXCEPTION_CONTINUE_SEARCH;
2576 #endif
2577 }
2578 }
2579 }
2580
2581 #ifdef _WIN64
2582 // Special care for fast JNI field accessors.
2583 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2584 // in and the heap gets shrunk before the field access.
2585 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2586 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2587 if (addr != (address)-1) {
2588 return Handle_Exception(exceptionInfo, addr);
2589 }
2590 }
2591 #endif
2592
2593 // Stack overflow or null pointer exception in native code.
2594 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2595 exceptionInfo->ContextRecord);
2596 return EXCEPTION_CONTINUE_SEARCH;
2597 } // /EXCEPTION_ACCESS_VIOLATION
2598 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2599 #if defined _M_IA64
2600 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2601 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2602 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2603
2604 // Compiled method patched to be non entrant? Following conditions must apply:
2605 // 1. must be first instruction in bundle
2606 // 2. must be a break instruction with appropriate code
2607 if ((((uint64_t) pc & 0x0F) == 0) &&
2608 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2609 return Handle_Exception(exceptionInfo,
2610 (address)SharedRuntime::get_handle_wrong_method_stub());
2611 }
2612 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2613 #endif
2614
2615
2616 if (in_java) {
2617 switch (exception_code) {
2618 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2619 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2620
2621 case EXCEPTION_INT_OVERFLOW:
2622 return Handle_IDiv_Exception(exceptionInfo);
2623
2624 } // switch
2625 }
2626 if (((thread->thread_state() == _thread_in_Java) ||
2627 (thread->thread_state() == _thread_in_native)) &&
2628 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2629 LONG result=Handle_FLT_Exception(exceptionInfo);
2630 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2631 }
2632 }
2633
2634 if (exception_code != EXCEPTION_BREAKPOINT) {
2635 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2636 exceptionInfo->ContextRecord);
2637 }
2638 return EXCEPTION_CONTINUE_SEARCH;
2639 }
2640
2641 #ifndef _WIN64
2642 // Special care for fast JNI accessors.
2643 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2644 // the heap gets shrunk before the field access.
2645 // Need to install our own structured exception handler since native code may
2646 // install its own.
2647 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2648 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2649 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2650 address pc = (address) exceptionInfo->ContextRecord->Eip;
2651 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2652 if (addr != (address)-1) {
2653 return Handle_Exception(exceptionInfo, addr);
2654 }
2655 }
2656 return EXCEPTION_CONTINUE_SEARCH;
2657 }
2658
2659 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2660 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2661 jobject obj, \
2662 jfieldID fieldID) { \
2663 __try { \
2664 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2665 obj, \
2666 fieldID); \
2667 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2668 _exception_info())) { \
2669 } \
2670 return 0; \
2671 }
2672
2673 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2674 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2675 DEFINE_FAST_GETFIELD(jchar, char, Char)
2676 DEFINE_FAST_GETFIELD(jshort, short, Short)
2677 DEFINE_FAST_GETFIELD(jint, int, Int)
2678 DEFINE_FAST_GETFIELD(jlong, long, Long)
2679 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2680 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2681
2682 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2683 switch (type) {
2684 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2685 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2686 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2687 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2688 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2689 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2690 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2691 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2692 default: ShouldNotReachHere();
2693 }
2694 return (address)-1;
2695 }
2696 #endif
2697
2698 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2699 // Install a win32 structured exception handler around the test
2700 // function call so the VM can generate an error dump if needed.
2701 __try {
2702 (*funcPtr)();
2703 } __except(topLevelExceptionFilter(
2704 (_EXCEPTION_POINTERS*)_exception_info())) {
2705 // Nothing to do.
2706 }
2707 }
2708
2709 // Virtual Memory
2710
2711 int os::vm_page_size() { return os::win32::vm_page_size(); }
2712 int os::vm_allocation_granularity() {
2713 return os::win32::vm_allocation_granularity();
2714 }
2715
2716 // Windows large page support is available on Windows 2003. In order to use
2717 // large page memory, the administrator must first assign additional privilege
2718 // to the user:
2719 // + select Control Panel -> Administrative Tools -> Local Security Policy
2720 // + select Local Policies -> User Rights Assignment
2721 // + double click "Lock pages in memory", add users and/or groups
2722 // + reboot
2723 // Note the above steps are needed for administrator as well, as administrators
2724 // by default do not have the privilege to lock pages in memory.
2725 //
2726 // Note about Windows 2003: although the API supports committing large page
2727 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2728 // scenario, I found through experiment it only uses large page if the entire
2729 // memory region is reserved and committed in a single VirtualAlloc() call.
2730 // This makes Windows large page support more or less like Solaris ISM, in
2731 // that the entire heap must be committed upfront. This probably will change
2732 // in the future, if so the code below needs to be revisited.
2733
2734 #ifndef MEM_LARGE_PAGES
2735 #define MEM_LARGE_PAGES 0x20000000
2736 #endif
2737
2738 static HANDLE _hProcess;
2739 static HANDLE _hToken;
2740
2741 // Container for NUMA node list info
2742 class NUMANodeListHolder {
2743 private:
2744 int *_numa_used_node_list; // allocated below
2745 int _numa_used_node_count;
2746
2747 void free_node_list() {
2748 if (_numa_used_node_list != NULL) {
2749 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2750 }
2751 }
2752
2753 public:
2754 NUMANodeListHolder() {
2755 _numa_used_node_count = 0;
2756 _numa_used_node_list = NULL;
2757 // do rest of initialization in build routine (after function pointers are set up)
2758 }
2759
2760 ~NUMANodeListHolder() {
2761 free_node_list();
2762 }
2763
2764 bool build() {
2765 DWORD_PTR proc_aff_mask;
2766 DWORD_PTR sys_aff_mask;
2767 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2768 ULONG highest_node_number;
2769 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2770 free_node_list();
2771 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2772 for (unsigned int i = 0; i <= highest_node_number; i++) {
2773 ULONGLONG proc_mask_numa_node;
2774 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2775 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2776 _numa_used_node_list[_numa_used_node_count++] = i;
2777 }
2778 }
2779 return (_numa_used_node_count > 1);
2780 }
2781
2782 int get_count() { return _numa_used_node_count; }
2783 int get_node_list_entry(int n) {
2784 // for indexes out of range, returns -1
2785 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2786 }
2787
2788 } numa_node_list_holder;
2789
2790
2791
2792 static size_t _large_page_size = 0;
2793
2794 static bool resolve_functions_for_large_page_init() {
2795 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2796 os::Advapi32Dll::AdvapiAvailable();
2797 }
2798
2799 static bool request_lock_memory_privilege() {
2800 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2801 os::current_process_id());
2802
2803 LUID luid;
2804 if (_hProcess != NULL &&
2805 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2806 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2807
2808 TOKEN_PRIVILEGES tp;
2809 tp.PrivilegeCount = 1;
2810 tp.Privileges[0].Luid = luid;
2811 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2812
2813 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2814 // privilege. Check GetLastError() too. See MSDN document.
2815 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2816 (GetLastError() == ERROR_SUCCESS)) {
2817 return true;
2818 }
2819 }
2820
2821 return false;
2822 }
2823
2824 static void cleanup_after_large_page_init() {
2825 if (_hProcess) CloseHandle(_hProcess);
2826 _hProcess = NULL;
2827 if (_hToken) CloseHandle(_hToken);
2828 _hToken = NULL;
2829 }
2830
2831 static bool numa_interleaving_init() {
2832 bool success = false;
2833 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2834
2835 // print a warning if UseNUMAInterleaving flag is specified on command line
2836 bool warn_on_failure = use_numa_interleaving_specified;
2837 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2838
2839 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2840 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2841 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2842
2843 if (os::Kernel32Dll::NumaCallsAvailable()) {
2844 if (numa_node_list_holder.build()) {
2845 if (PrintMiscellaneous && Verbose) {
2846 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2847 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2848 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2849 }
2850 tty->print("\n");
2851 }
2852 success = true;
2853 } else {
2854 WARN("Process does not cover multiple NUMA nodes.");
2855 }
2856 } else {
2857 WARN("NUMA Interleaving is not supported by the operating system.");
2858 }
2859 if (!success) {
2860 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2861 }
2862 return success;
2863 #undef WARN
2864 }
2865
2866 // this routine is used whenever we need to reserve a contiguous VA range
2867 // but we need to make separate VirtualAlloc calls for each piece of the range
2868 // Reasons for doing this:
2869 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2870 // * UseNUMAInterleaving requires a separate node for each piece
2871 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2872 DWORD prot,
2873 bool should_inject_error = false) {
2874 char * p_buf;
2875 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2876 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2877 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2878
2879 // first reserve enough address space in advance since we want to be
2880 // able to break a single contiguous virtual address range into multiple
2881 // large page commits but WS2003 does not allow reserving large page space
2882 // so we just use 4K pages for reserve, this gives us a legal contiguous
2883 // address space. then we will deallocate that reservation, and re alloc
2884 // using large pages
2885 const size_t size_of_reserve = bytes + chunk_size;
2886 if (bytes > size_of_reserve) {
2887 // Overflowed.
2888 return NULL;
2889 }
2890 p_buf = (char *) VirtualAlloc(addr,
2891 size_of_reserve, // size of Reserve
2892 MEM_RESERVE,
2893 PAGE_READWRITE);
2894 // If reservation failed, return NULL
2895 if (p_buf == NULL) return NULL;
2896 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2897 os::release_memory(p_buf, bytes + chunk_size);
2898
2899 // we still need to round up to a page boundary (in case we are using large pages)
2900 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2901 // instead we handle this in the bytes_to_rq computation below
2902 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2903
2904 // now go through and allocate one chunk at a time until all bytes are
2905 // allocated
2906 size_t bytes_remaining = bytes;
2907 // An overflow of align_size_up() would have been caught above
2908 // in the calculation of size_of_reserve.
2909 char * next_alloc_addr = p_buf;
2910 HANDLE hProc = GetCurrentProcess();
2911
2912 #ifdef ASSERT
2913 // Variable for the failure injection
2914 long ran_num = os::random();
2915 size_t fail_after = ran_num % bytes;
2916 #endif
2917
2918 int count=0;
2919 while (bytes_remaining) {
2920 // select bytes_to_rq to get to the next chunk_size boundary
2921
2922 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2923 // Note allocate and commit
2924 char * p_new;
2925
2926 #ifdef ASSERT
2927 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2928 #else
2929 const bool inject_error_now = false;
2930 #endif
2931
2932 if (inject_error_now) {
2933 p_new = NULL;
2934 } else {
2935 if (!UseNUMAInterleaving) {
2936 p_new = (char *) VirtualAlloc(next_alloc_addr,
2937 bytes_to_rq,
2938 flags,
2939 prot);
2940 } else {
2941 // get the next node to use from the used_node_list
2942 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2943 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2944 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2945 next_alloc_addr,
2946 bytes_to_rq,
2947 flags,
2948 prot,
2949 node);
2950 }
2951 }
2952
2953 if (p_new == NULL) {
2954 // Free any allocated pages
2955 if (next_alloc_addr > p_buf) {
2956 // Some memory was committed so release it.
2957 size_t bytes_to_release = bytes - bytes_remaining;
2958 // NMT has yet to record any individual blocks, so it
2959 // need to create a dummy 'reserve' record to match
2960 // the release.
2961 MemTracker::record_virtual_memory_reserve((address)p_buf,
2962 bytes_to_release, CALLER_PC);
2963 os::release_memory(p_buf, bytes_to_release);
2964 }
2965 #ifdef ASSERT
2966 if (should_inject_error) {
2967 if (TracePageSizes && Verbose) {
2968 tty->print_cr("Reserving pages individually failed.");
2969 }
2970 }
2971 #endif
2972 return NULL;
2973 }
2974
2975 bytes_remaining -= bytes_to_rq;
2976 next_alloc_addr += bytes_to_rq;
2977 count++;
2978 }
2979 // Although the memory is allocated individually, it is returned as one.
2980 // NMT records it as one block.
2981 if ((flags & MEM_COMMIT) != 0) {
2982 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2983 } else {
2984 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2985 }
2986
2987 // made it this far, success
2988 return p_buf;
2989 }
2990
2991
2992
2993 void os::large_page_init() {
2994 if (!UseLargePages) return;
2995
2996 // print a warning if any large page related flag is specified on command line
2997 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2998 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2999 bool success = false;
3000
3001 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3002 if (resolve_functions_for_large_page_init()) {
3003 if (request_lock_memory_privilege()) {
3004 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3005 if (s) {
3006 #if defined(IA32) || defined(AMD64)
3007 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3008 WARN("JVM cannot use large pages bigger than 4mb.");
3009 } else {
3010 #endif
3011 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3012 _large_page_size = LargePageSizeInBytes;
3013 } else {
3014 _large_page_size = s;
3015 }
3016 success = true;
3017 #if defined(IA32) || defined(AMD64)
3018 }
3019 #endif
3020 } else {
3021 WARN("Large page is not supported by the processor.");
3022 }
3023 } else {
3024 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3025 }
3026 } else {
3027 WARN("Large page is not supported by the operating system.");
3028 }
3029 #undef WARN
3030
3031 const size_t default_page_size = (size_t) vm_page_size();
3032 if (success && _large_page_size > default_page_size) {
3033 _page_sizes[0] = _large_page_size;
3034 _page_sizes[1] = default_page_size;
3035 _page_sizes[2] = 0;
3036 }
3037
3038 cleanup_after_large_page_init();
3039 UseLargePages = success;
3040 }
3041
3042 // On win32, one cannot release just a part of reserved memory, it's an
3043 // all or nothing deal. When we split a reservation, we must break the
3044 // reservation into two reservations.
3045 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3046 bool realloc) {
3047 if (size > 0) {
3048 release_memory(base, size);
3049 if (realloc) {
3050 reserve_memory(split, base);
3051 }
3052 if (size != split) {
3053 reserve_memory(size - split, base + split);
3054 }
3055 }
3056 }
3057
3058 // Multiple threads can race in this code but it's not possible to unmap small sections of
3059 // virtual space to get requested alignment, like posix-like os's.
3060 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3061 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3062 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3063 "Alignment must be a multiple of allocation granularity (page size)");
3064 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3065
3066 size_t extra_size = size + alignment;
3067 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3068
3069 char* aligned_base = NULL;
3070
3071 do {
3072 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3073 if (extra_base == NULL) {
3074 return NULL;
3075 }
3076 // Do manual alignment
3077 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3078
3079 os::release_memory(extra_base, extra_size);
3080
3081 aligned_base = os::reserve_memory(size, aligned_base);
3082
3083 } while (aligned_base == NULL);
3084
3085 return aligned_base;
3086 }
3087
3088 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3089 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3090 "reserve alignment");
3091 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3092 char* res;
3093 // note that if UseLargePages is on, all the areas that require interleaving
3094 // will go thru reserve_memory_special rather than thru here.
3095 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3096 if (!use_individual) {
3097 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3098 } else {
3099 elapsedTimer reserveTimer;
3100 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3101 // in numa interleaving, we have to allocate pages individually
3102 // (well really chunks of NUMAInterleaveGranularity size)
3103 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3104 if (res == NULL) {
3105 warning("NUMA page allocation failed");
3106 }
3107 if (Verbose && PrintMiscellaneous) {
3108 reserveTimer.stop();
3109 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3110 reserveTimer.milliseconds(), reserveTimer.ticks());
3111 }
3112 }
3113 assert(res == NULL || addr == NULL || addr == res,
3114 "Unexpected address from reserve.");
3115
3116 return res;
3117 }
3118
3119 // Reserve memory at an arbitrary address, only if that area is
3120 // available (and not reserved for something else).
3121 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3122 // Windows os::reserve_memory() fails of the requested address range is
3123 // not avilable.
3124 return reserve_memory(bytes, requested_addr);
3125 }
3126
3127 size_t os::large_page_size() {
3128 return _large_page_size;
3129 }
3130
3131 bool os::can_commit_large_page_memory() {
3132 // Windows only uses large page memory when the entire region is reserved
3133 // and committed in a single VirtualAlloc() call. This may change in the
3134 // future, but with Windows 2003 it's not possible to commit on demand.
3135 return false;
3136 }
3137
3138 bool os::can_execute_large_page_memory() {
3139 return true;
3140 }
3141
3142 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3143 bool exec) {
3144 assert(UseLargePages, "only for large pages");
3145
3146 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3147 return NULL; // Fallback to small pages.
3148 }
3149
3150 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3151 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3152
3153 // with large pages, there are two cases where we need to use Individual Allocation
3154 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3155 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3156 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3157 if (TracePageSizes && Verbose) {
3158 tty->print_cr("Reserving large pages individually.");
3159 }
3160 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3161 if (p_buf == NULL) {
3162 // give an appropriate warning message
3163 if (UseNUMAInterleaving) {
3164 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3165 }
3166 if (UseLargePagesIndividualAllocation) {
3167 warning("Individually allocated large pages failed, "
3168 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3169 }
3170 return NULL;
3171 }
3172
3173 return p_buf;
3174
3175 } else {
3176 if (TracePageSizes && Verbose) {
3177 tty->print_cr("Reserving large pages in a single large chunk.");
3178 }
3179 // normal policy just allocate it all at once
3180 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3181 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3182 if (res != NULL) {
3183 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3184 }
3185
3186 return res;
3187 }
3188 }
3189
3190 bool os::release_memory_special(char* base, size_t bytes) {
3191 assert(base != NULL, "Sanity check");
3192 return release_memory(base, bytes);
3193 }
3194
3195 void os::print_statistics() {
3196 }
3197
3198 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3199 int err = os::get_last_error();
3200 char buf[256];
3201 size_t buf_len = os::lasterror(buf, sizeof(buf));
3202 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3203 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3204 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3205 }
3206
3207 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3208 if (bytes == 0) {
3209 // Don't bother the OS with noops.
3210 return true;
3211 }
3212 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3213 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3214 // Don't attempt to print anything if the OS call fails. We're
3215 // probably low on resources, so the print itself may cause crashes.
3216
3217 // unless we have NUMAInterleaving enabled, the range of a commit
3218 // is always within a reserve covered by a single VirtualAlloc
3219 // in that case we can just do a single commit for the requested size
3220 if (!UseNUMAInterleaving) {
3221 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3222 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3223 return false;
3224 }
3225 if (exec) {
3226 DWORD oldprot;
3227 // Windows doc says to use VirtualProtect to get execute permissions
3228 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3229 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3230 return false;
3231 }
3232 }
3233 return true;
3234 } else {
3235
3236 // when NUMAInterleaving is enabled, the commit might cover a range that
3237 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3238 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3239 // returns represents the number of bytes that can be committed in one step.
3240 size_t bytes_remaining = bytes;
3241 char * next_alloc_addr = addr;
3242 while (bytes_remaining > 0) {
3243 MEMORY_BASIC_INFORMATION alloc_info;
3244 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3245 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3246 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3247 PAGE_READWRITE) == NULL) {
3248 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3249 exec);)
3250 return false;
3251 }
3252 if (exec) {
3253 DWORD oldprot;
3254 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3255 PAGE_EXECUTE_READWRITE, &oldprot)) {
3256 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3257 exec);)
3258 return false;
3259 }
3260 }
3261 bytes_remaining -= bytes_to_rq;
3262 next_alloc_addr += bytes_to_rq;
3263 }
3264 }
3265 // if we made it this far, return true
3266 return true;
3267 }
3268
3269 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3270 bool exec) {
3271 // alignment_hint is ignored on this OS
3272 return pd_commit_memory(addr, size, exec);
3273 }
3274
3275 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3276 const char* mesg) {
3277 assert(mesg != NULL, "mesg must be specified");
3278 if (!pd_commit_memory(addr, size, exec)) {
3279 warn_fail_commit_memory(addr, size, exec);
3280 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3281 }
3282 }
3283
3284 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3285 size_t alignment_hint, bool exec,
3286 const char* mesg) {
3287 // alignment_hint is ignored on this OS
3288 pd_commit_memory_or_exit(addr, size, exec, mesg);
3289 }
3290
3291 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3292 if (bytes == 0) {
3293 // Don't bother the OS with noops.
3294 return true;
3295 }
3296 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3297 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3298 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3299 }
3300
3301 bool os::pd_release_memory(char* addr, size_t bytes) {
3302 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3303 }
3304
3305 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3306 return os::commit_memory(addr, size, !ExecMem);
3307 }
3308
3309 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3310 return os::uncommit_memory(addr, size);
3311 }
3312
3313 // Set protections specified
3314 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3315 bool is_committed) {
3316 unsigned int p = 0;
3317 switch (prot) {
3318 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3319 case MEM_PROT_READ: p = PAGE_READONLY; break;
3320 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3321 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3322 default:
3323 ShouldNotReachHere();
3324 }
3325
3326 DWORD old_status;
3327
3328 // Strange enough, but on Win32 one can change protection only for committed
3329 // memory, not a big deal anyway, as bytes less or equal than 64K
3330 if (!is_committed) {
3331 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3332 "cannot commit protection page");
3333 }
3334 // One cannot use os::guard_memory() here, as on Win32 guard page
3335 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3336 //
3337 // Pages in the region become guard pages. Any attempt to access a guard page
3338 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3339 // the guard page status. Guard pages thus act as a one-time access alarm.
3340 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3341 }
3342
3343 bool os::guard_memory(char* addr, size_t bytes) {
3344 DWORD old_status;
3345 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3346 }
3347
3348 bool os::unguard_memory(char* addr, size_t bytes) {
3349 DWORD old_status;
3350 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3351 }
3352
3353 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3354 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3355 void os::numa_make_global(char *addr, size_t bytes) { }
3356 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3357 bool os::numa_topology_changed() { return false; }
3358 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3359 int os::numa_get_group_id() { return 0; }
3360 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3361 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3362 // Provide an answer for UMA systems
3363 ids[0] = 0;
3364 return 1;
3365 } else {
3366 // check for size bigger than actual groups_num
3367 size = MIN2(size, numa_get_groups_num());
3368 for (int i = 0; i < (int)size; i++) {
3369 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3370 }
3371 return size;
3372 }
3373 }
3374
3375 bool os::get_page_info(char *start, page_info* info) {
3376 return false;
3377 }
3378
3379 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3380 page_info* page_found) {
3381 return end;
3382 }
3383
3384 char* os::non_memory_address_word() {
3385 // Must never look like an address returned by reserve_memory,
3386 // even in its subfields (as defined by the CPU immediate fields,
3387 // if the CPU splits constants across multiple instructions).
3388 return (char*)-1;
3389 }
3390
3391 #define MAX_ERROR_COUNT 100
3392 #define SYS_THREAD_ERROR 0xffffffffUL
3393
3394 void os::pd_start_thread(Thread* thread) {
3395 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3396 // Returns previous suspend state:
3397 // 0: Thread was not suspended
3398 // 1: Thread is running now
3399 // >1: Thread is still suspended.
3400 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3401 }
3402
3403 class HighResolutionInterval : public CHeapObj<mtThread> {
3404 // The default timer resolution seems to be 10 milliseconds.
3405 // (Where is this written down?)
3406 // If someone wants to sleep for only a fraction of the default,
3407 // then we set the timer resolution down to 1 millisecond for
3408 // the duration of their interval.
3409 // We carefully set the resolution back, since otherwise we
3410 // seem to incur an overhead (3%?) that we don't need.
3411 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3412 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3413 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3414 // timeBeginPeriod() if the relative error exceeded some threshold.
3415 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3416 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3417 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3418 // resolution timers running.
3419 private:
3420 jlong resolution;
3421 public:
3422 HighResolutionInterval(jlong ms) {
3423 resolution = ms % 10L;
3424 if (resolution != 0) {
3425 MMRESULT result = timeBeginPeriod(1L);
3426 }
3427 }
3428 ~HighResolutionInterval() {
3429 if (resolution != 0) {
3430 MMRESULT result = timeEndPeriod(1L);
3431 }
3432 resolution = 0L;
3433 }
3434 };
3435
3436 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3437 jlong limit = (jlong) MAXDWORD;
3438
3439 while (ms > limit) {
3440 int res;
3441 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3442 return res;
3443 }
3444 ms -= limit;
3445 }
3446
3447 assert(thread == Thread::current(), "thread consistency check");
3448 OSThread* osthread = thread->osthread();
3449 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3450 int result;
3451 if (interruptable) {
3452 assert(thread->is_Java_thread(), "must be java thread");
3453 JavaThread *jt = (JavaThread *) thread;
3454 ThreadBlockInVM tbivm(jt);
3455
3456 jt->set_suspend_equivalent();
3457 // cleared by handle_special_suspend_equivalent_condition() or
3458 // java_suspend_self() via check_and_wait_while_suspended()
3459
3460 HANDLE events[1];
3461 events[0] = osthread->interrupt_event();
3462 HighResolutionInterval *phri=NULL;
3463 if (!ForceTimeHighResolution) {
3464 phri = new HighResolutionInterval(ms);
3465 }
3466 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3467 result = OS_TIMEOUT;
3468 } else {
3469 ResetEvent(osthread->interrupt_event());
3470 osthread->set_interrupted(false);
3471 result = OS_INTRPT;
3472 }
3473 delete phri; //if it is NULL, harmless
3474
3475 // were we externally suspended while we were waiting?
3476 jt->check_and_wait_while_suspended();
3477 } else {
3478 assert(!thread->is_Java_thread(), "must not be java thread");
3479 Sleep((long) ms);
3480 result = OS_TIMEOUT;
3481 }
3482 return result;
3483 }
3484
3485 // Short sleep, direct OS call.
3486 //
3487 // ms = 0, means allow others (if any) to run.
3488 //
3489 void os::naked_short_sleep(jlong ms) {
3490 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3491 Sleep(ms);
3492 }
3493
3494 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3495 void os::infinite_sleep() {
3496 while (true) { // sleep forever ...
3497 Sleep(100000); // ... 100 seconds at a time
3498 }
3499 }
3500
3501 typedef BOOL (WINAPI * STTSignature)(void);
3502
3503 void os::naked_yield() {
3504 // Use either SwitchToThread() or Sleep(0)
3505 // Consider passing back the return value from SwitchToThread().
3506 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3507 SwitchToThread();
3508 } else {
3509 Sleep(0);
3510 }
3511 }
3512
3513 // Win32 only gives you access to seven real priorities at a time,
3514 // so we compress Java's ten down to seven. It would be better
3515 // if we dynamically adjusted relative priorities.
3516
3517 int os::java_to_os_priority[CriticalPriority + 1] = {
3518 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3519 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3520 THREAD_PRIORITY_LOWEST, // 2
3521 THREAD_PRIORITY_BELOW_NORMAL, // 3
3522 THREAD_PRIORITY_BELOW_NORMAL, // 4
3523 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3524 THREAD_PRIORITY_NORMAL, // 6
3525 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3526 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3527 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3528 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3529 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3530 };
3531
3532 int prio_policy1[CriticalPriority + 1] = {
3533 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3534 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3535 THREAD_PRIORITY_LOWEST, // 2
3536 THREAD_PRIORITY_BELOW_NORMAL, // 3
3537 THREAD_PRIORITY_BELOW_NORMAL, // 4
3538 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3540 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3541 THREAD_PRIORITY_HIGHEST, // 8
3542 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3543 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3544 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3545 };
3546
3547 static int prio_init() {
3548 // If ThreadPriorityPolicy is 1, switch tables
3549 if (ThreadPriorityPolicy == 1) {
3550 int i;
3551 for (i = 0; i < CriticalPriority + 1; i++) {
3552 os::java_to_os_priority[i] = prio_policy1[i];
3553 }
3554 }
3555 if (UseCriticalJavaThreadPriority) {
3556 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3557 }
3558 return 0;
3559 }
3560
3561 OSReturn os::set_native_priority(Thread* thread, int priority) {
3562 if (!UseThreadPriorities) return OS_OK;
3563 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3564 return ret ? OS_OK : OS_ERR;
3565 }
3566
3567 OSReturn os::get_native_priority(const Thread* const thread,
3568 int* priority_ptr) {
3569 if (!UseThreadPriorities) {
3570 *priority_ptr = java_to_os_priority[NormPriority];
3571 return OS_OK;
3572 }
3573 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3574 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3575 assert(false, "GetThreadPriority failed");
3576 return OS_ERR;
3577 }
3578 *priority_ptr = os_prio;
3579 return OS_OK;
3580 }
3581
3582
3583 // Hint to the underlying OS that a task switch would not be good.
3584 // Void return because it's a hint and can fail.
3585 void os::hint_no_preempt() {}
3586
3587 void os::interrupt(Thread* thread) {
3588 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3589 Threads_lock->owned_by_self(),
3590 "possibility of dangling Thread pointer");
3591
3592 OSThread* osthread = thread->osthread();
3593 osthread->set_interrupted(true);
3594 // More than one thread can get here with the same value of osthread,
3595 // resulting in multiple notifications. We do, however, want the store
3596 // to interrupted() to be visible to other threads before we post
3597 // the interrupt event.
3598 OrderAccess::release();
3599 SetEvent(osthread->interrupt_event());
3600 // For JSR166: unpark after setting status
3601 if (thread->is_Java_thread()) {
3602 ((JavaThread*)thread)->parker()->unpark();
3603 }
3604
3605 ParkEvent * ev = thread->_ParkEvent;
3606 if (ev != NULL) ev->unpark();
3607 }
3608
3609
3610 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3611 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3612 "possibility of dangling Thread pointer");
3613
3614 OSThread* osthread = thread->osthread();
3615 // There is no synchronization between the setting of the interrupt
3616 // and it being cleared here. It is critical - see 6535709 - that
3617 // we only clear the interrupt state, and reset the interrupt event,
3618 // if we are going to report that we were indeed interrupted - else
3619 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3620 // depending on the timing. By checking thread interrupt event to see
3621 // if the thread gets real interrupt thus prevent spurious wakeup.
3622 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3623 if (interrupted && clear_interrupted) {
3624 osthread->set_interrupted(false);
3625 ResetEvent(osthread->interrupt_event());
3626 } // Otherwise leave the interrupted state alone
3627
3628 return interrupted;
3629 }
3630
3631 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3632 ExtendedPC os::get_thread_pc(Thread* thread) {
3633 CONTEXT context;
3634 context.ContextFlags = CONTEXT_CONTROL;
3635 HANDLE handle = thread->osthread()->thread_handle();
3636 #ifdef _M_IA64
3637 assert(0, "Fix get_thread_pc");
3638 return ExtendedPC(NULL);
3639 #else
3640 if (GetThreadContext(handle, &context)) {
3641 #ifdef _M_AMD64
3642 return ExtendedPC((address) context.Rip);
3643 #else
3644 return ExtendedPC((address) context.Eip);
3645 #endif
3646 } else {
3647 return ExtendedPC(NULL);
3648 }
3649 #endif
3650 }
3651
3652 // GetCurrentThreadId() returns DWORD
3653 intx os::current_thread_id() { return GetCurrentThreadId(); }
3654
3655 static int _initial_pid = 0;
3656
3657 int os::current_process_id() {
3658 return (_initial_pid ? _initial_pid : _getpid());
3659 }
3660
3661 int os::win32::_vm_page_size = 0;
3662 int os::win32::_vm_allocation_granularity = 0;
3663 int os::win32::_processor_type = 0;
3664 // Processor level is not available on non-NT systems, use vm_version instead
3665 int os::win32::_processor_level = 0;
3666 julong os::win32::_physical_memory = 0;
3667 size_t os::win32::_default_stack_size = 0;
3668
3669 intx os::win32::_os_thread_limit = 0;
3670 volatile intx os::win32::_os_thread_count = 0;
3671
3672 bool os::win32::_is_nt = false;
3673 bool os::win32::_is_windows_2003 = false;
3674 bool os::win32::_is_windows_server = false;
3675
3676 // 6573254
3677 // Currently, the bug is observed across all the supported Windows releases,
3678 // including the latest one (as of this writing - Windows Server 2012 R2)
3679 bool os::win32::_has_exit_bug = true;
3680 bool os::win32::_has_performance_count = 0;
3681
3682 void os::win32::initialize_system_info() {
3683 SYSTEM_INFO si;
3684 GetSystemInfo(&si);
3685 _vm_page_size = si.dwPageSize;
3686 _vm_allocation_granularity = si.dwAllocationGranularity;
3687 _processor_type = si.dwProcessorType;
3688 _processor_level = si.wProcessorLevel;
3689 set_processor_count(si.dwNumberOfProcessors);
3690
3691 MEMORYSTATUSEX ms;
3692 ms.dwLength = sizeof(ms);
3693
3694 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3695 // dwMemoryLoad (% of memory in use)
3696 GlobalMemoryStatusEx(&ms);
3697 _physical_memory = ms.ullTotalPhys;
3698
3699 OSVERSIONINFOEX oi;
3700 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3701 GetVersionEx((OSVERSIONINFO*)&oi);
3702 switch (oi.dwPlatformId) {
3703 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3704 case VER_PLATFORM_WIN32_NT:
3705 _is_nt = true;
3706 {
3707 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3708 if (os_vers == 5002) {
3709 _is_windows_2003 = true;
3710 }
3711 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3712 oi.wProductType == VER_NT_SERVER) {
3713 _is_windows_server = true;
3714 }
3715 }
3716 break;
3717 default: fatal("Unknown platform");
3718 }
3719
3720 _default_stack_size = os::current_stack_size();
3721 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3722 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3723 "stack size not a multiple of page size");
3724
3725 initialize_performance_counter();
3726
3727 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3728 // known to deadlock the system, if the VM issues to thread operations with
3729 // a too high frequency, e.g., such as changing the priorities.
3730 // The 6000 seems to work well - no deadlocks has been notices on the test
3731 // programs that we have seen experience this problem.
3732 if (!os::win32::is_nt()) {
3733 StarvationMonitorInterval = 6000;
3734 }
3735 }
3736
3737
3738 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3739 int ebuflen) {
3740 char path[MAX_PATH];
3741 DWORD size;
3742 DWORD pathLen = (DWORD)sizeof(path);
3743 HINSTANCE result = NULL;
3744
3745 // only allow library name without path component
3746 assert(strchr(name, '\\') == NULL, "path not allowed");
3747 assert(strchr(name, ':') == NULL, "path not allowed");
3748 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3749 jio_snprintf(ebuf, ebuflen,
3750 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3751 return NULL;
3752 }
3753
3754 // search system directory
3755 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3756 if (size >= pathLen) {
3757 return NULL; // truncated
3758 }
3759 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3760 return NULL; // truncated
3761 }
3762 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3763 return result;
3764 }
3765 }
3766
3767 // try Windows directory
3768 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3769 if (size >= pathLen) {
3770 return NULL; // truncated
3771 }
3772 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3773 return NULL; // truncated
3774 }
3775 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3776 return result;
3777 }
3778 }
3779
3780 jio_snprintf(ebuf, ebuflen,
3781 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3782 return NULL;
3783 }
3784
3785 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */
3786
3787 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3788 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3789 return TRUE;
3790 }
3791
3792 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3793 // Basic approach:
3794 // - Each exiting thread registers its intent to exit and then does so.
3795 // - A thread trying to terminate the process must wait for all
3796 // threads currently exiting to complete their exit.
3797
3798 if (os::win32::has_exit_bug()) {
3799 // The array holds handles of the threads that have started exiting by calling
3800 // _endthreadex().
3801 // Should be large enough to avoid blocking the exiting thread due to lack of
3802 // a free slot.
3803 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3804 static int handle_count = 0;
3805
3806 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3807 static CRITICAL_SECTION crit_sect;
3808 static volatile jint process_exiting = 0;
3809 int i, j;
3810 DWORD res;
3811 HANDLE hproc, hthr;
3812
3813 // The first thread that reached this point, initializes the critical section.
3814 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3815 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3816 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3817 EnterCriticalSection(&crit_sect);
3818
3819 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3820 // Remove from the array those handles of the threads that have completed exiting.
3821 for (i = 0, j = 0; i < handle_count; ++i) {
3822 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3823 if (res == WAIT_TIMEOUT) {
3824 handles[j++] = handles[i];
3825 } else {
3826 if (res == WAIT_FAILED) {
3827 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3828 GetLastError(), __FILE__, __LINE__);
3829 }
3830 // Don't keep the handle, if we failed waiting for it.
3831 CloseHandle(handles[i]);
3832 }
3833 }
3834
3835 // If there's no free slot in the array of the kept handles, we'll have to
3836 // wait until at least one thread completes exiting.
3837 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3838 // Raise the priority of the oldest exiting thread to increase its chances
3839 // to complete sooner.
3840 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3841 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3842 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3843 i = (res - WAIT_OBJECT_0);
3844 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3845 for (; i < handle_count; ++i) {
3846 handles[i] = handles[i + 1];
3847 }
3848 } else {
3849 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3850 (res == WAIT_FAILED ? "failed" : "timed out"),
3851 GetLastError(), __FILE__, __LINE__);
3852 // Don't keep handles, if we failed waiting for them.
3853 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3854 CloseHandle(handles[i]);
3855 }
3856 handle_count = 0;
3857 }
3858 }
3859
3860 // Store a duplicate of the current thread handle in the array of handles.
3861 hproc = GetCurrentProcess();
3862 hthr = GetCurrentThread();
3863 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3864 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3865 warning("DuplicateHandle failed (%u) in %s: %d\n",
3866 GetLastError(), __FILE__, __LINE__);
3867 } else {
3868 ++handle_count;
3869 }
3870
3871 // The current exiting thread has stored its handle in the array, and now
3872 // should leave the critical section before calling _endthreadex().
3873
3874 } else if (what != EPT_THREAD) {
3875 if (handle_count > 0) {
3876 // Before ending the process, make sure all the threads that had called
3877 // _endthreadex() completed.
3878
3879 // Set the priority level of the current thread to the same value as
3880 // the priority level of exiting threads.
3881 // This is to ensure it will be given a fair chance to execute if
3882 // the timeout expires.
3883 hthr = GetCurrentThread();
3884 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3885 for (i = 0; i < handle_count; ++i) {
3886 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3887 }
3888 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3889 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3890 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3891 (res == WAIT_FAILED ? "failed" : "timed out"),
3892 GetLastError(), __FILE__, __LINE__);
3893 }
3894 for (i = 0; i < handle_count; ++i) {
3895 CloseHandle(handles[i]);
3896 }
3897 handle_count = 0;
3898 }
3899
3900 OrderAccess::release_store(&process_exiting, 1);
3901 }
3902
3903 LeaveCriticalSection(&crit_sect);
3904 }
3905
3906 if (what == EPT_THREAD) {
3907 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3908 // Some other thread is about to call exit(), so we
3909 // don't let the current thread proceed to _endthreadex()
3910 SuspendThread(GetCurrentThread());
3911 // Avoid busy-wait loop, if SuspendThread() failed.
3912 Sleep(EXIT_TIMEOUT);
3913 }
3914 }
3915 }
3916
3917 // We are here if either
3918 // - there's no 'race at exit' bug on this OS release;
3919 // - initialization of the critical section failed (unlikely);
3920 // - the current thread has stored its handle and left the critical section;
3921 // - the process-exiting thread has raised the flag and left the critical section.
3922 if (what == EPT_THREAD) {
3923 _endthreadex((unsigned)exit_code);
3924 } else if (what == EPT_PROCESS) {
3925 ::exit(exit_code);
3926 } else {
3927 _exit(exit_code);
3928 }
3929
3930 // Should not reach here
3931 return exit_code;
3932 }
3933
3934 #undef EXIT_TIMEOUT
3935
3936 void os::win32::setmode_streams() {
3937 _setmode(_fileno(stdin), _O_BINARY);
3938 _setmode(_fileno(stdout), _O_BINARY);
3939 _setmode(_fileno(stderr), _O_BINARY);
3940 }
3941
3942
3943 bool os::is_debugger_attached() {
3944 return IsDebuggerPresent() ? true : false;
3945 }
3946
3947
3948 void os::wait_for_keypress_at_exit(void) {
3949 if (PauseAtExit) {
3950 fprintf(stderr, "Press any key to continue...\n");
3951 fgetc(stdin);
3952 }
3953 }
3954
3955
3956 int os::message_box(const char* title, const char* message) {
3957 int result = MessageBox(NULL, message, title,
3958 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3959 return result == IDYES;
3960 }
3961
3962 int os::allocate_thread_local_storage() {
3963 return TlsAlloc();
3964 }
3965
3966
3967 void os::free_thread_local_storage(int index) {
3968 TlsFree(index);
3969 }
3970
3971
3972 void os::thread_local_storage_at_put(int index, void* value) {
3973 TlsSetValue(index, value);
3974 assert(thread_local_storage_at(index) == value, "Just checking");
3975 }
3976
3977
3978 void* os::thread_local_storage_at(int index) {
3979 return TlsGetValue(index);
3980 }
3981
3982
3983 #ifndef PRODUCT
3984 #ifndef _WIN64
3985 // Helpers to check whether NX protection is enabled
3986 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3987 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3988 pex->ExceptionRecord->NumberParameters > 0 &&
3989 pex->ExceptionRecord->ExceptionInformation[0] ==
3990 EXCEPTION_INFO_EXEC_VIOLATION) {
3991 return EXCEPTION_EXECUTE_HANDLER;
3992 }
3993 return EXCEPTION_CONTINUE_SEARCH;
3994 }
3995
3996 void nx_check_protection() {
3997 // If NX is enabled we'll get an exception calling into code on the stack
3998 char code[] = { (char)0xC3 }; // ret
3999 void *code_ptr = (void *)code;
4000 __try {
4001 __asm call code_ptr
4002 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4003 tty->print_raw_cr("NX protection detected.");
4004 }
4005 }
4006 #endif // _WIN64
4007 #endif // PRODUCT
4008
4009 // this is called _before_ the global arguments have been parsed
4010 void os::init(void) {
4011 _initial_pid = _getpid();
4012
4013 init_random(1234567);
4014
4015 win32::initialize_system_info();
4016 win32::setmode_streams();
4017 init_page_sizes((size_t) win32::vm_page_size());
4018
4019 // This may be overridden later when argument processing is done.
4020 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4021 os::win32::is_windows_2003());
4022
4023 // Initialize main_process and main_thread
4024 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4025 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4026 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4027 fatal("DuplicateHandle failed\n");
4028 }
4029 main_thread_id = (int) GetCurrentThreadId();
4030 }
4031
4032 // To install functions for atexit processing
4033 extern "C" {
4034 static void perfMemory_exit_helper() {
4035 perfMemory_exit();
4036 }
4037 }
4038
4039 static jint initSock();
4040
4041 // this is called _after_ the global arguments have been parsed
4042 jint os::init_2(void) {
4043 // Allocate a single page and mark it as readable for safepoint polling
4044 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4045 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4046
4047 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4048 guarantee(return_page != NULL, "Commit Failed for polling page");
4049
4050 os::set_polling_page(polling_page);
4051
4052 #ifndef PRODUCT
4053 if (Verbose && PrintMiscellaneous) {
4054 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4055 (intptr_t)polling_page);
4056 }
4057 #endif
4058
4059 if (!UseMembar) {
4060 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4061 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4062
4063 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4064 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4065
4066 os::set_memory_serialize_page(mem_serialize_page);
4067
4068 #ifndef PRODUCT
4069 if (Verbose && PrintMiscellaneous) {
4070 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4071 (intptr_t)mem_serialize_page);
4072 }
4073 #endif
4074 }
4075
4076 // Setup Windows Exceptions
4077
4078 // for debugging float code generation bugs
4079 if (ForceFloatExceptions) {
4080 #ifndef _WIN64
4081 static long fp_control_word = 0;
4082 __asm { fstcw fp_control_word }
4083 // see Intel PPro Manual, Vol. 2, p 7-16
4084 const long precision = 0x20;
4085 const long underflow = 0x10;
4086 const long overflow = 0x08;
4087 const long zero_div = 0x04;
4088 const long denorm = 0x02;
4089 const long invalid = 0x01;
4090 fp_control_word |= invalid;
4091 __asm { fldcw fp_control_word }
4092 #endif
4093 }
4094
4095 // If stack_commit_size is 0, windows will reserve the default size,
4096 // but only commit a small portion of it.
4097 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4098 size_t default_reserve_size = os::win32::default_stack_size();
4099 size_t actual_reserve_size = stack_commit_size;
4100 if (stack_commit_size < default_reserve_size) {
4101 // If stack_commit_size == 0, we want this too
4102 actual_reserve_size = default_reserve_size;
4103 }
4104
4105 // Check minimum allowable stack size for thread creation and to initialize
4106 // the java system classes, including StackOverflowError - depends on page
4107 // size. Add a page for compiler2 recursion in main thread.
4108 // Add in 2*BytesPerWord times page size to account for VM stack during
4109 // class initialization depending on 32 or 64 bit VM.
4110 size_t min_stack_allowed =
4111 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4112 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4113 if (actual_reserve_size < min_stack_allowed) {
4114 tty->print_cr("\nThe stack size specified is too small, "
4115 "Specify at least %dk",
4116 min_stack_allowed / K);
4117 return JNI_ERR;
4118 }
4119
4120 JavaThread::set_stack_size_at_create(stack_commit_size);
4121
4122 // Calculate theoretical max. size of Threads to guard gainst artifical
4123 // out-of-memory situations, where all available address-space has been
4124 // reserved by thread stacks.
4125 assert(actual_reserve_size != 0, "Must have a stack");
4126
4127 // Calculate the thread limit when we should start doing Virtual Memory
4128 // banging. Currently when the threads will have used all but 200Mb of space.
4129 //
4130 // TODO: consider performing a similar calculation for commit size instead
4131 // as reserve size, since on a 64-bit platform we'll run into that more
4132 // often than running out of virtual memory space. We can use the
4133 // lower value of the two calculations as the os_thread_limit.
4134 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4135 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4136
4137 // at exit methods are called in the reverse order of their registration.
4138 // there is no limit to the number of functions registered. atexit does
4139 // not set errno.
4140
4141 if (PerfAllowAtExitRegistration) {
4142 // only register atexit functions if PerfAllowAtExitRegistration is set.
4143 // atexit functions can be delayed until process exit time, which
4144 // can be problematic for embedded VM situations. Embedded VMs should
4145 // call DestroyJavaVM() to assure that VM resources are released.
4146
4147 // note: perfMemory_exit_helper atexit function may be removed in
4148 // the future if the appropriate cleanup code can be added to the
4149 // VM_Exit VMOperation's doit method.
4150 if (atexit(perfMemory_exit_helper) != 0) {
4151 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4152 }
4153 }
4154
4155 #ifndef _WIN64
4156 // Print something if NX is enabled (win32 on AMD64)
4157 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4158 #endif
4159
4160 // initialize thread priority policy
4161 prio_init();
4162
4163 if (UseNUMA && !ForceNUMA) {
4164 UseNUMA = false; // We don't fully support this yet
4165 }
4166
4167 if (UseNUMAInterleaving) {
4168 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4169 bool success = numa_interleaving_init();
4170 if (!success) UseNUMAInterleaving = false;
4171 }
4172
4173 if (initSock() != JNI_OK) {
4174 return JNI_ERR;
4175 }
4176
4177 return JNI_OK;
4178 }
4179
4180 // Mark the polling page as unreadable
4181 void os::make_polling_page_unreadable(void) {
4182 DWORD old_status;
4183 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4184 PAGE_NOACCESS, &old_status)) {
4185 fatal("Could not disable polling page");
4186 }
4187 }
4188
4189 // Mark the polling page as readable
4190 void os::make_polling_page_readable(void) {
4191 DWORD old_status;
4192 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4193 PAGE_READONLY, &old_status)) {
4194 fatal("Could not enable polling page");
4195 }
4196 }
4197
4198
4199 int os::stat(const char *path, struct stat *sbuf) {
4200 char pathbuf[MAX_PATH];
4201 if (strlen(path) > MAX_PATH - 1) {
4202 errno = ENAMETOOLONG;
4203 return -1;
4204 }
4205 os::native_path(strcpy(pathbuf, path));
4206 int ret = ::stat(pathbuf, sbuf);
4207 if (sbuf != NULL && UseUTCFileTimestamp) {
4208 // Fix for 6539723. st_mtime returned from stat() is dependent on
4209 // the system timezone and so can return different values for the
4210 // same file if/when daylight savings time changes. This adjustment
4211 // makes sure the same timestamp is returned regardless of the TZ.
4212 //
4213 // See:
4214 // http://msdn.microsoft.com/library/
4215 // default.asp?url=/library/en-us/sysinfo/base/
4216 // time_zone_information_str.asp
4217 // and
4218 // http://msdn.microsoft.com/library/default.asp?url=
4219 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4220 //
4221 // NOTE: there is a insidious bug here: If the timezone is changed
4222 // after the call to stat() but before 'GetTimeZoneInformation()', then
4223 // the adjustment we do here will be wrong and we'll return the wrong
4224 // value (which will likely end up creating an invalid class data
4225 // archive). Absent a better API for this, or some time zone locking
4226 // mechanism, we'll have to live with this risk.
4227 TIME_ZONE_INFORMATION tz;
4228 DWORD tzid = GetTimeZoneInformation(&tz);
4229 int daylightBias =
4230 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4231 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4232 }
4233 return ret;
4234 }
4235
4236
4237 #define FT2INT64(ft) \
4238 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4239
4240
4241 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4242 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4243 // of a thread.
4244 //
4245 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4246 // the fast estimate available on the platform.
4247
4248 // current_thread_cpu_time() is not optimized for Windows yet
4249 jlong os::current_thread_cpu_time() {
4250 // return user + sys since the cost is the same
4251 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4252 }
4253
4254 jlong os::thread_cpu_time(Thread* thread) {
4255 // consistent with what current_thread_cpu_time() returns.
4256 return os::thread_cpu_time(thread, true /* user+sys */);
4257 }
4258
4259 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4260 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4261 }
4262
4263 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4264 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4265 // If this function changes, os::is_thread_cpu_time_supported() should too
4266 if (os::win32::is_nt()) {
4267 FILETIME CreationTime;
4268 FILETIME ExitTime;
4269 FILETIME KernelTime;
4270 FILETIME UserTime;
4271
4272 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4273 &ExitTime, &KernelTime, &UserTime) == 0) {
4274 return -1;
4275 } else if (user_sys_cpu_time) {
4276 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4277 } else {
4278 return FT2INT64(UserTime) * 100;
4279 }
4280 } else {
4281 return (jlong) timeGetTime() * 1000000;
4282 }
4283 }
4284
4285 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4286 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4287 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4288 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4289 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4290 }
4291
4292 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4293 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4294 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4295 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4296 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4297 }
4298
4299 bool os::is_thread_cpu_time_supported() {
4300 // see os::thread_cpu_time
4301 if (os::win32::is_nt()) {
4302 FILETIME CreationTime;
4303 FILETIME ExitTime;
4304 FILETIME KernelTime;
4305 FILETIME UserTime;
4306
4307 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4308 &KernelTime, &UserTime) == 0) {
4309 return false;
4310 } else {
4311 return true;
4312 }
4313 } else {
4314 return false;
4315 }
4316 }
4317
4318 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4319 // It does have primitives (PDH API) to get CPU usage and run queue length.
4320 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4321 // If we wanted to implement loadavg on Windows, we have a few options:
4322 //
4323 // a) Query CPU usage and run queue length and "fake" an answer by
4324 // returning the CPU usage if it's under 100%, and the run queue
4325 // length otherwise. It turns out that querying is pretty slow
4326 // on Windows, on the order of 200 microseconds on a fast machine.
4327 // Note that on the Windows the CPU usage value is the % usage
4328 // since the last time the API was called (and the first call
4329 // returns 100%), so we'd have to deal with that as well.
4330 //
4331 // b) Sample the "fake" answer using a sampling thread and store
4332 // the answer in a global variable. The call to loadavg would
4333 // just return the value of the global, avoiding the slow query.
4334 //
4335 // c) Sample a better answer using exponential decay to smooth the
4336 // value. This is basically the algorithm used by UNIX kernels.
4337 //
4338 // Note that sampling thread starvation could affect both (b) and (c).
4339 int os::loadavg(double loadavg[], int nelem) {
4340 return -1;
4341 }
4342
4343
4344 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4345 bool os::dont_yield() {
4346 return DontYieldALot;
4347 }
4348
4349 // This method is a slightly reworked copy of JDK's sysOpen
4350 // from src/windows/hpi/src/sys_api_md.c
4351
4352 int os::open(const char *path, int oflag, int mode) {
4353 char pathbuf[MAX_PATH];
4354
4355 if (strlen(path) > MAX_PATH - 1) {
4356 errno = ENAMETOOLONG;
4357 return -1;
4358 }
4359 os::native_path(strcpy(pathbuf, path));
4360 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4361 }
4362
4363 FILE* os::open(int fd, const char* mode) {
4364 return ::_fdopen(fd, mode);
4365 }
4366
4367 // Is a (classpath) directory empty?
4368 bool os::dir_is_empty(const char* path) {
4369 WIN32_FIND_DATA fd;
4370 HANDLE f = FindFirstFile(path, &fd);
4371 if (f == INVALID_HANDLE_VALUE) {
4372 return true;
4373 }
4374 FindClose(f);
4375 return false;
4376 }
4377
4378 // create binary file, rewriting existing file if required
4379 int os::create_binary_file(const char* path, bool rewrite_existing) {
4380 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4381 if (!rewrite_existing) {
4382 oflags |= _O_EXCL;
4383 }
4384 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4385 }
4386
4387 // return current position of file pointer
4388 jlong os::current_file_offset(int fd) {
4389 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4390 }
4391
4392 // move file pointer to the specified offset
4393 jlong os::seek_to_file_offset(int fd, jlong offset) {
4394 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4395 }
4396
4397
4398 jlong os::lseek(int fd, jlong offset, int whence) {
4399 return (jlong) ::_lseeki64(fd, offset, whence);
4400 }
4401
4402 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4403 OVERLAPPED ov;
4404 DWORD nread;
4405 BOOL result;
4406
4407 ZeroMemory(&ov, sizeof(ov));
4408 ov.Offset = (DWORD)offset;
4409 ov.OffsetHigh = (DWORD)(offset >> 32);
4410
4411 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4412
4413 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4414
4415 return result ? nread : 0;
4416 }
4417
4418
4419 // This method is a slightly reworked copy of JDK's sysNativePath
4420 // from src/windows/hpi/src/path_md.c
4421
4422 // Convert a pathname to native format. On win32, this involves forcing all
4423 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4424 // sometimes rejects '/') and removing redundant separators. The input path is
4425 // assumed to have been converted into the character encoding used by the local
4426 // system. Because this might be a double-byte encoding, care is taken to
4427 // treat double-byte lead characters correctly.
4428 //
4429 // This procedure modifies the given path in place, as the result is never
4430 // longer than the original. There is no error return; this operation always
4431 // succeeds.
4432 char * os::native_path(char *path) {
4433 char *src = path, *dst = path, *end = path;
4434 char *colon = NULL; // If a drive specifier is found, this will
4435 // point to the colon following the drive letter
4436
4437 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4438 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4439 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4440
4441 // Check for leading separators
4442 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4443 while (isfilesep(*src)) {
4444 src++;
4445 }
4446
4447 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4448 // Remove leading separators if followed by drive specifier. This
4449 // hack is necessary to support file URLs containing drive
4450 // specifiers (e.g., "file://c:/path"). As a side effect,
4451 // "/c:/path" can be used as an alternative to "c:/path".
4452 *dst++ = *src++;
4453 colon = dst;
4454 *dst++ = ':';
4455 src++;
4456 } else {
4457 src = path;
4458 if (isfilesep(src[0]) && isfilesep(src[1])) {
4459 // UNC pathname: Retain first separator; leave src pointed at
4460 // second separator so that further separators will be collapsed
4461 // into the second separator. The result will be a pathname
4462 // beginning with "\\\\" followed (most likely) by a host name.
4463 src = dst = path + 1;
4464 path[0] = '\\'; // Force first separator to '\\'
4465 }
4466 }
4467
4468 end = dst;
4469
4470 // Remove redundant separators from remainder of path, forcing all
4471 // separators to be '\\' rather than '/'. Also, single byte space
4472 // characters are removed from the end of the path because those
4473 // are not legal ending characters on this operating system.
4474 //
4475 while (*src != '\0') {
4476 if (isfilesep(*src)) {
4477 *dst++ = '\\'; src++;
4478 while (isfilesep(*src)) src++;
4479 if (*src == '\0') {
4480 // Check for trailing separator
4481 end = dst;
4482 if (colon == dst - 2) break; // "z:\\"
4483 if (dst == path + 1) break; // "\\"
4484 if (dst == path + 2 && isfilesep(path[0])) {
4485 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4486 // beginning of a UNC pathname. Even though it is not, by
4487 // itself, a valid UNC pathname, we leave it as is in order
4488 // to be consistent with the path canonicalizer as well
4489 // as the win32 APIs, which treat this case as an invalid
4490 // UNC pathname rather than as an alias for the root
4491 // directory of the current drive.
4492 break;
4493 }
4494 end = --dst; // Path does not denote a root directory, so
4495 // remove trailing separator
4496 break;
4497 }
4498 end = dst;
4499 } else {
4500 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4501 *dst++ = *src++;
4502 if (*src) *dst++ = *src++;
4503 end = dst;
4504 } else { // Copy a single-byte character
4505 char c = *src++;
4506 *dst++ = c;
4507 // Space is not a legal ending character
4508 if (c != ' ') end = dst;
4509 }
4510 }
4511 }
4512
4513 *end = '\0';
4514
4515 // For "z:", add "." to work around a bug in the C runtime library
4516 if (colon == dst - 1) {
4517 path[2] = '.';
4518 path[3] = '\0';
4519 }
4520
4521 return path;
4522 }
4523
4524 // This code is a copy of JDK's sysSetLength
4525 // from src/windows/hpi/src/sys_api_md.c
4526
4527 int os::ftruncate(int fd, jlong length) {
4528 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4529 long high = (long)(length >> 32);
4530 DWORD ret;
4531
4532 if (h == (HANDLE)(-1)) {
4533 return -1;
4534 }
4535
4536 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4537 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4538 return -1;
4539 }
4540
4541 if (::SetEndOfFile(h) == FALSE) {
4542 return -1;
4543 }
4544
4545 return 0;
4546 }
4547
4548
4549 // This code is a copy of JDK's sysSync
4550 // from src/windows/hpi/src/sys_api_md.c
4551 // except for the legacy workaround for a bug in Win 98
4552
4553 int os::fsync(int fd) {
4554 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4555
4556 if ((!::FlushFileBuffers(handle)) &&
4557 (GetLastError() != ERROR_ACCESS_DENIED)) {
4558 // from winerror.h
4559 return -1;
4560 }
4561 return 0;
4562 }
4563
4564 static int nonSeekAvailable(int, long *);
4565 static int stdinAvailable(int, long *);
4566
4567 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4568 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4569
4570 // This code is a copy of JDK's sysAvailable
4571 // from src/windows/hpi/src/sys_api_md.c
4572
4573 int os::available(int fd, jlong *bytes) {
4574 jlong cur, end;
4575 struct _stati64 stbuf64;
4576
4577 if (::_fstati64(fd, &stbuf64) >= 0) {
4578 int mode = stbuf64.st_mode;
4579 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4580 int ret;
4581 long lpbytes;
4582 if (fd == 0) {
4583 ret = stdinAvailable(fd, &lpbytes);
4584 } else {
4585 ret = nonSeekAvailable(fd, &lpbytes);
4586 }
4587 (*bytes) = (jlong)(lpbytes);
4588 return ret;
4589 }
4590 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4591 return FALSE;
4592 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4593 return FALSE;
4594 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4595 return FALSE;
4596 }
4597 *bytes = end - cur;
4598 return TRUE;
4599 } else {
4600 return FALSE;
4601 }
4602 }
4603
4604 // This code is a copy of JDK's nonSeekAvailable
4605 // from src/windows/hpi/src/sys_api_md.c
4606
4607 static int nonSeekAvailable(int fd, long *pbytes) {
4608 // This is used for available on non-seekable devices
4609 // (like both named and anonymous pipes, such as pipes
4610 // connected to an exec'd process).
4611 // Standard Input is a special case.
4612 HANDLE han;
4613
4614 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4615 return FALSE;
4616 }
4617
4618 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4619 // PeekNamedPipe fails when at EOF. In that case we
4620 // simply make *pbytes = 0 which is consistent with the
4621 // behavior we get on Solaris when an fd is at EOF.
4622 // The only alternative is to raise an Exception,
4623 // which isn't really warranted.
4624 //
4625 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4626 return FALSE;
4627 }
4628 *pbytes = 0;
4629 }
4630 return TRUE;
4631 }
4632
4633 #define MAX_INPUT_EVENTS 2000
4634
4635 // This code is a copy of JDK's stdinAvailable
4636 // from src/windows/hpi/src/sys_api_md.c
4637
4638 static int stdinAvailable(int fd, long *pbytes) {
4639 HANDLE han;
4640 DWORD numEventsRead = 0; // Number of events read from buffer
4641 DWORD numEvents = 0; // Number of events in buffer
4642 DWORD i = 0; // Loop index
4643 DWORD curLength = 0; // Position marker
4644 DWORD actualLength = 0; // Number of bytes readable
4645 BOOL error = FALSE; // Error holder
4646 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4647
4648 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4649 return FALSE;
4650 }
4651
4652 // Construct an array of input records in the console buffer
4653 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4654 if (error == 0) {
4655 return nonSeekAvailable(fd, pbytes);
4656 }
4657
4658 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4659 if (numEvents > MAX_INPUT_EVENTS) {
4660 numEvents = MAX_INPUT_EVENTS;
4661 }
4662
4663 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4664 if (lpBuffer == NULL) {
4665 return FALSE;
4666 }
4667
4668 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4669 if (error == 0) {
4670 os::free(lpBuffer);
4671 return FALSE;
4672 }
4673
4674 // Examine input records for the number of bytes available
4675 for (i=0; i<numEvents; i++) {
4676 if (lpBuffer[i].EventType == KEY_EVENT) {
4677
4678 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4679 &(lpBuffer[i].Event);
4680 if (keyRecord->bKeyDown == TRUE) {
4681 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4682 curLength++;
4683 if (*keyPressed == '\r') {
4684 actualLength = curLength;
4685 }
4686 }
4687 }
4688 }
4689
4690 if (lpBuffer != NULL) {
4691 os::free(lpBuffer);
4692 }
4693
4694 *pbytes = (long) actualLength;
4695 return TRUE;
4696 }
4697
4698 // Map a block of memory.
4699 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4700 char *addr, size_t bytes, bool read_only,
4701 bool allow_exec) {
4702 HANDLE hFile;
4703 char* base;
4704
4705 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4706 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4707 if (hFile == NULL) {
4708 if (PrintMiscellaneous && Verbose) {
4709 DWORD err = GetLastError();
4710 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4711 }
4712 return NULL;
4713 }
4714
4715 if (allow_exec) {
4716 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4717 // unless it comes from a PE image (which the shared archive is not.)
4718 // Even VirtualProtect refuses to give execute access to mapped memory
4719 // that was not previously executable.
4720 //
4721 // Instead, stick the executable region in anonymous memory. Yuck.
4722 // Penalty is that ~4 pages will not be shareable - in the future
4723 // we might consider DLLizing the shared archive with a proper PE
4724 // header so that mapping executable + sharing is possible.
4725
4726 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4727 PAGE_READWRITE);
4728 if (base == NULL) {
4729 if (PrintMiscellaneous && Verbose) {
4730 DWORD err = GetLastError();
4731 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4732 }
4733 CloseHandle(hFile);
4734 return NULL;
4735 }
4736
4737 DWORD bytes_read;
4738 OVERLAPPED overlapped;
4739 overlapped.Offset = (DWORD)file_offset;
4740 overlapped.OffsetHigh = 0;
4741 overlapped.hEvent = NULL;
4742 // ReadFile guarantees that if the return value is true, the requested
4743 // number of bytes were read before returning.
4744 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4745 if (!res) {
4746 if (PrintMiscellaneous && Verbose) {
4747 DWORD err = GetLastError();
4748 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4749 }
4750 release_memory(base, bytes);
4751 CloseHandle(hFile);
4752 return NULL;
4753 }
4754 } else {
4755 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4756 NULL /* file_name */);
4757 if (hMap == NULL) {
4758 if (PrintMiscellaneous && Verbose) {
4759 DWORD err = GetLastError();
4760 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4761 }
4762 CloseHandle(hFile);
4763 return NULL;
4764 }
4765
4766 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4767 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4768 (DWORD)bytes, addr);
4769 if (base == NULL) {
4770 if (PrintMiscellaneous && Verbose) {
4771 DWORD err = GetLastError();
4772 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4773 }
4774 CloseHandle(hMap);
4775 CloseHandle(hFile);
4776 return NULL;
4777 }
4778
4779 if (CloseHandle(hMap) == 0) {
4780 if (PrintMiscellaneous && Verbose) {
4781 DWORD err = GetLastError();
4782 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4783 }
4784 CloseHandle(hFile);
4785 return base;
4786 }
4787 }
4788
4789 if (allow_exec) {
4790 DWORD old_protect;
4791 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4792 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4793
4794 if (!res) {
4795 if (PrintMiscellaneous && Verbose) {
4796 DWORD err = GetLastError();
4797 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4798 }
4799 // Don't consider this a hard error, on IA32 even if the
4800 // VirtualProtect fails, we should still be able to execute
4801 CloseHandle(hFile);
4802 return base;
4803 }
4804 }
4805
4806 if (CloseHandle(hFile) == 0) {
4807 if (PrintMiscellaneous && Verbose) {
4808 DWORD err = GetLastError();
4809 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4810 }
4811 return base;
4812 }
4813
4814 return base;
4815 }
4816
4817
4818 // Remap a block of memory.
4819 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4820 char *addr, size_t bytes, bool read_only,
4821 bool allow_exec) {
4822 // This OS does not allow existing memory maps to be remapped so we
4823 // have to unmap the memory before we remap it.
4824 if (!os::unmap_memory(addr, bytes)) {
4825 return NULL;
4826 }
4827
4828 // There is a very small theoretical window between the unmap_memory()
4829 // call above and the map_memory() call below where a thread in native
4830 // code may be able to access an address that is no longer mapped.
4831
4832 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4833 read_only, allow_exec);
4834 }
4835
4836
4837 // Unmap a block of memory.
4838 // Returns true=success, otherwise false.
4839
4840 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4841 BOOL result = UnmapViewOfFile(addr);
4842 if (result == 0) {
4843 if (PrintMiscellaneous && Verbose) {
4844 DWORD err = GetLastError();
4845 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4846 }
4847 return false;
4848 }
4849 return true;
4850 }
4851
4852 void os::pause() {
4853 char filename[MAX_PATH];
4854 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4855 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4856 } else {
4857 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4858 }
4859
4860 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4861 if (fd != -1) {
4862 struct stat buf;
4863 ::close(fd);
4864 while (::stat(filename, &buf) == 0) {
4865 Sleep(100);
4866 }
4867 } else {
4868 jio_fprintf(stderr,
4869 "Could not open pause file '%s', continuing immediately.\n", filename);
4870 }
4871 }
4872
4873 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4874 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4875 }
4876
4877 // See the caveats for this class in os_windows.hpp
4878 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4879 // into this method and returns false. If no OS EXCEPTION was raised, returns
4880 // true.
4881 // The callback is supposed to provide the method that should be protected.
4882 //
4883 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4884 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4885 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4886 "crash_protection already set?");
4887
4888 bool success = true;
4889 __try {
4890 WatcherThread::watcher_thread()->set_crash_protection(this);
4891 cb.call();
4892 } __except(EXCEPTION_EXECUTE_HANDLER) {
4893 // only for protection, nothing to do
4894 success = false;
4895 }
4896 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4897 return success;
4898 }
4899
4900 // An Event wraps a win32 "CreateEvent" kernel handle.
4901 //
4902 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4903 //
4904 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4905 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4906 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4907 // In addition, an unpark() operation might fetch the handle field, but the
4908 // event could recycle between the fetch and the SetEvent() operation.
4909 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4910 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4911 // on an stale but recycled handle would be harmless, but in practice this might
4912 // confuse other non-Sun code, so it's not a viable approach.
4913 //
4914 // 2: Once a win32 event handle is associated with an Event, it remains associated
4915 // with the Event. The event handle is never closed. This could be construed
4916 // as handle leakage, but only up to the maximum # of threads that have been extant
4917 // at any one time. This shouldn't be an issue, as windows platforms typically
4918 // permit a process to have hundreds of thousands of open handles.
4919 //
4920 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4921 // and release unused handles.
4922 //
4923 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4924 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4925 //
4926 // 5. Use an RCU-like mechanism (Read-Copy Update).
4927 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4928 //
4929 // We use (2).
4930 //
4931 // TODO-FIXME:
4932 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4933 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4934 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4935 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4936 // into a single win32 CreateEvent() handle.
4937 //
4938 // Assumption:
4939 // Only one parker can exist on an event, which is why we allocate
4940 // them per-thread. Multiple unparkers can coexist.
4941 //
4942 // _Event transitions in park()
4943 // -1 => -1 : illegal
4944 // 1 => 0 : pass - return immediately
4945 // 0 => -1 : block; then set _Event to 0 before returning
4946 //
4947 // _Event transitions in unpark()
4948 // 0 => 1 : just return
4949 // 1 => 1 : just return
4950 // -1 => either 0 or 1; must signal target thread
4951 // That is, we can safely transition _Event from -1 to either
4952 // 0 or 1.
4953 //
4954 // _Event serves as a restricted-range semaphore.
4955 // -1 : thread is blocked, i.e. there is a waiter
4956 // 0 : neutral: thread is running or ready,
4957 // could have been signaled after a wait started
4958 // 1 : signaled - thread is running or ready
4959 //
4960 // Another possible encoding of _Event would be with
4961 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4962 //
4963
4964 int os::PlatformEvent::park(jlong Millis) {
4965 // Transitions for _Event:
4966 // -1 => -1 : illegal
4967 // 1 => 0 : pass - return immediately
4968 // 0 => -1 : block; then set _Event to 0 before returning
4969
4970 guarantee(_ParkHandle != NULL , "Invariant");
4971 guarantee(Millis > 0 , "Invariant");
4972
4973 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4974 // the initial park() operation.
4975 // Consider: use atomic decrement instead of CAS-loop
4976
4977 int v;
4978 for (;;) {
4979 v = _Event;
4980 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4981 }
4982 guarantee((v == 0) || (v == 1), "invariant");
4983 if (v != 0) return OS_OK;
4984
4985 // Do this the hard way by blocking ...
4986 // TODO: consider a brief spin here, gated on the success of recent
4987 // spin attempts by this thread.
4988 //
4989 // We decompose long timeouts into series of shorter timed waits.
4990 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4991 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4992 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4993 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4994 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4995 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4996 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4997 // for the already waited time. This policy does not admit any new outcomes.
4998 // In the future, however, we might want to track the accumulated wait time and
4999 // adjust Millis accordingly if we encounter a spurious wakeup.
5000
5001 const int MAXTIMEOUT = 0x10000000;
5002 DWORD rv = WAIT_TIMEOUT;
5003 while (_Event < 0 && Millis > 0) {
5004 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5005 if (Millis > MAXTIMEOUT) {
5006 prd = MAXTIMEOUT;
5007 }
5008 rv = ::WaitForSingleObject(_ParkHandle, prd);
5009 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5010 if (rv == WAIT_TIMEOUT) {
5011 Millis -= prd;
5012 }
5013 }
5014 v = _Event;
5015 _Event = 0;
5016 // see comment at end of os::PlatformEvent::park() below:
5017 OrderAccess::fence();
5018 // If we encounter a nearly simultanous timeout expiry and unpark()
5019 // we return OS_OK indicating we awoke via unpark().
5020 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5021 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5022 }
5023
5024 void os::PlatformEvent::park() {
5025 // Transitions for _Event:
5026 // -1 => -1 : illegal
5027 // 1 => 0 : pass - return immediately
5028 // 0 => -1 : block; then set _Event to 0 before returning
5029
5030 guarantee(_ParkHandle != NULL, "Invariant");
5031 // Invariant: Only the thread associated with the Event/PlatformEvent
5032 // may call park().
5033 // Consider: use atomic decrement instead of CAS-loop
5034 int v;
5035 for (;;) {
5036 v = _Event;
5037 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5038 }
5039 guarantee((v == 0) || (v == 1), "invariant");
5040 if (v != 0) return;
5041
5042 // Do this the hard way by blocking ...
5043 // TODO: consider a brief spin here, gated on the success of recent
5044 // spin attempts by this thread.
5045 while (_Event < 0) {
5046 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5047 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5048 }
5049
5050 // Usually we'll find _Event == 0 at this point, but as
5051 // an optional optimization we clear it, just in case can
5052 // multiple unpark() operations drove _Event up to 1.
5053 _Event = 0;
5054 OrderAccess::fence();
5055 guarantee(_Event >= 0, "invariant");
5056 }
5057
5058 void os::PlatformEvent::unpark() {
5059 guarantee(_ParkHandle != NULL, "Invariant");
5060
5061 // Transitions for _Event:
5062 // 0 => 1 : just return
5063 // 1 => 1 : just return
5064 // -1 => either 0 or 1; must signal target thread
5065 // That is, we can safely transition _Event from -1 to either
5066 // 0 or 1.
5067 // See also: "Semaphores in Plan 9" by Mullender & Cox
5068 //
5069 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5070 // that it will take two back-to-back park() calls for the owning
5071 // thread to block. This has the benefit of forcing a spurious return
5072 // from the first park() call after an unpark() call which will help
5073 // shake out uses of park() and unpark() without condition variables.
5074
5075 if (Atomic::xchg(1, &_Event) >= 0) return;
5076
5077 ::SetEvent(_ParkHandle);
5078 }
5079
5080
5081 // JSR166
5082 // -------------------------------------------------------
5083
5084 // The Windows implementation of Park is very straightforward: Basic
5085 // operations on Win32 Events turn out to have the right semantics to
5086 // use them directly. We opportunistically resuse the event inherited
5087 // from Monitor.
5088
5089 void Parker::park(bool isAbsolute, jlong time) {
5090 guarantee(_ParkEvent != NULL, "invariant");
5091 // First, demultiplex/decode time arguments
5092 if (time < 0) { // don't wait
5093 return;
5094 } else if (time == 0 && !isAbsolute) {
5095 time = INFINITE;
5096 } else if (isAbsolute) {
5097 time -= os::javaTimeMillis(); // convert to relative time
5098 if (time <= 0) { // already elapsed
5099 return;
5100 }
5101 } else { // relative
5102 time /= 1000000; // Must coarsen from nanos to millis
5103 if (time == 0) { // Wait for the minimal time unit if zero
5104 time = 1;
5105 }
5106 }
5107
5108 JavaThread* thread = (JavaThread*)(Thread::current());
5109 assert(thread->is_Java_thread(), "Must be JavaThread");
5110 JavaThread *jt = (JavaThread *)thread;
5111
5112 // Don't wait if interrupted or already triggered
5113 if (Thread::is_interrupted(thread, false) ||
5114 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5115 ResetEvent(_ParkEvent);
5116 return;
5117 } else {
5118 ThreadBlockInVM tbivm(jt);
5119 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5120 jt->set_suspend_equivalent();
5121
5122 WaitForSingleObject(_ParkEvent, time);
5123 ResetEvent(_ParkEvent);
5124
5125 // If externally suspended while waiting, re-suspend
5126 if (jt->handle_special_suspend_equivalent_condition()) {
5127 jt->java_suspend_self();
5128 }
5129 }
5130 }
5131
5132 void Parker::unpark() {
5133 guarantee(_ParkEvent != NULL, "invariant");
5134 SetEvent(_ParkEvent);
5135 }
5136
5137 // Run the specified command in a separate process. Return its exit value,
5138 // or -1 on failure (e.g. can't create a new process).
5139 int os::fork_and_exec(char* cmd) {
5140 STARTUPINFO si;
5141 PROCESS_INFORMATION pi;
5142
5143 memset(&si, 0, sizeof(si));
5144 si.cb = sizeof(si);
5145 memset(&pi, 0, sizeof(pi));
5146 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5147 cmd, // command line
5148 NULL, // process security attribute
5149 NULL, // thread security attribute
5150 TRUE, // inherits system handles
5151 0, // no creation flags
5152 NULL, // use parent's environment block
5153 NULL, // use parent's starting directory
5154 &si, // (in) startup information
5155 &pi); // (out) process information
5156
5157 if (rslt) {
5158 // Wait until child process exits.
5159 WaitForSingleObject(pi.hProcess, INFINITE);
5160
5161 DWORD exit_code;
5162 GetExitCodeProcess(pi.hProcess, &exit_code);
5163
5164 // Close process and thread handles.
5165 CloseHandle(pi.hProcess);
5166 CloseHandle(pi.hThread);
5167
5168 return (int)exit_code;
5169 } else {
5170 return -1;
5171 }
5172 }
5173
5174 //--------------------------------------------------------------------------------------------------
5175 // Non-product code
5176
5177 static int mallocDebugIntervalCounter = 0;
5178 static int mallocDebugCounter = 0;
5179 bool os::check_heap(bool force) {
5180 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5181 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5182 // Note: HeapValidate executes two hardware breakpoints when it finds something
5183 // wrong; at these points, eax contains the address of the offending block (I think).
5184 // To get to the exlicit error message(s) below, just continue twice.
5185 HANDLE heap = GetProcessHeap();
5186
5187 // If we fail to lock the heap, then gflags.exe has been used
5188 // or some other special heap flag has been set that prevents
5189 // locking. We don't try to walk a heap we can't lock.
5190 if (HeapLock(heap) != 0) {
5191 PROCESS_HEAP_ENTRY phe;
5192 phe.lpData = NULL;
5193 while (HeapWalk(heap, &phe) != 0) {
5194 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5195 !HeapValidate(heap, 0, phe.lpData)) {
5196 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5197 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5198 fatal("corrupted C heap");
5199 }
5200 }
5201 DWORD err = GetLastError();
5202 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5203 fatal(err_msg("heap walk aborted with error %d", err));
5204 }
5205 HeapUnlock(heap);
5206 }
5207 mallocDebugIntervalCounter = 0;
5208 }
5209 return true;
5210 }
5211
5212
5213 bool os::find(address addr, outputStream* st) {
5214 // Nothing yet
5215 return false;
5216 }
5217
5218 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5219 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5220
5221 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5222 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5223 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5224 address addr = (address) exceptionRecord->ExceptionInformation[1];
5225
5226 if (os::is_memory_serialize_page(thread, addr)) {
5227 return EXCEPTION_CONTINUE_EXECUTION;
5228 }
5229 }
5230
5231 return EXCEPTION_CONTINUE_SEARCH;
5232 }
5233
5234 // We don't build a headless jre for Windows
5235 bool os::is_headless_jre() { return false; }
5236
5237 static jint initSock() {
5238 WSADATA wsadata;
5239
5240 if (!os::WinSock2Dll::WinSock2Available()) {
5241 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5242 ::GetLastError());
5243 return JNI_ERR;
5244 }
5245
5246 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5247 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5248 ::GetLastError());
5249 return JNI_ERR;
5250 }
5251 return JNI_OK;
5252 }
5253
5254 struct hostent* os::get_host_by_name(char* name) {
5255 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5256 }
5257
5258 int os::socket_close(int fd) {
5259 return ::closesocket(fd);
5260 }
5261
5262 int os::socket(int domain, int type, int protocol) {
5263 return ::socket(domain, type, protocol);
5264 }
5265
5266 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5267 return ::connect(fd, him, len);
5268 }
5269
5270 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5271 return ::recv(fd, buf, (int)nBytes, flags);
5272 }
5273
5274 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5275 return ::send(fd, buf, (int)nBytes, flags);
5276 }
5277
5278 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5279 return ::send(fd, buf, (int)nBytes, flags);
5280 }
5281
5282 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5283 #if defined(IA32)
5284 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5285 #elif defined (AMD64)
5286 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5287 #endif
5288
5289 // returns true if thread could be suspended,
5290 // false otherwise
5291 static bool do_suspend(HANDLE* h) {
5292 if (h != NULL) {
5293 if (SuspendThread(*h) != ~0) {
5294 return true;
5295 }
5296 }
5297 return false;
5298 }
5299
5300 // resume the thread
5301 // calling resume on an active thread is a no-op
5302 static void do_resume(HANDLE* h) {
5303 if (h != NULL) {
5304 ResumeThread(*h);
5305 }
5306 }
5307
5308 // retrieve a suspend/resume context capable handle
5309 // from the tid. Caller validates handle return value.
5310 void get_thread_handle_for_extended_context(HANDLE* h,
5311 OSThread::thread_id_t tid) {
5312 if (h != NULL) {
5313 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5314 }
5315 }
5316
5317 // Thread sampling implementation
5318 //
5319 void os::SuspendedThreadTask::internal_do_task() {
5320 CONTEXT ctxt;
5321 HANDLE h = NULL;
5322
5323 // get context capable handle for thread
5324 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5325
5326 // sanity
5327 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5328 return;
5329 }
5330
5331 // suspend the thread
5332 if (do_suspend(&h)) {
5333 ctxt.ContextFlags = sampling_context_flags;
5334 // get thread context
5335 GetThreadContext(h, &ctxt);
5336 SuspendedThreadTaskContext context(_thread, &ctxt);
5337 // pass context to Thread Sampling impl
5338 do_task(context);
5339 // resume thread
5340 do_resume(&h);
5341 }
5342
5343 // close handle
5344 CloseHandle(h);
5345 }
5346
5347
5348 // Kernel32 API
5349 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5350 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5351 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5352 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5353 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5354
5355 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5356 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5357 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5358 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5359 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5360
5361
5362 BOOL os::Kernel32Dll::initialized = FALSE;
5363 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5364 assert(initialized && _GetLargePageMinimum != NULL,
5365 "GetLargePageMinimumAvailable() not yet called");
5366 return _GetLargePageMinimum();
5367 }
5368
5369 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5370 if (!initialized) {
5371 initialize();
5372 }
5373 return _GetLargePageMinimum != NULL;
5374 }
5375
5376 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5377 if (!initialized) {
5378 initialize();
5379 }
5380 return _VirtualAllocExNuma != NULL;
5381 }
5382
5383 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5384 SIZE_T bytes, DWORD flags,
5385 DWORD prot, DWORD node) {
5386 assert(initialized && _VirtualAllocExNuma != NULL,
5387 "NUMACallsAvailable() not yet called");
5388
5389 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5390 }
5391
5392 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5393 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5394 "NUMACallsAvailable() not yet called");
5395
5396 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5397 }
5398
5399 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5400 PULONGLONG proc_mask) {
5401 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5402 "NUMACallsAvailable() not yet called");
5403
5404 return _GetNumaNodeProcessorMask(node, proc_mask);
5405 }
5406
5407 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5408 ULONG FrameToCapture,
5409 PVOID* BackTrace,
5410 PULONG BackTraceHash) {
5411 if (!initialized) {
5412 initialize();
5413 }
5414
5415 if (_RtlCaptureStackBackTrace != NULL) {
5416 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5417 BackTrace, BackTraceHash);
5418 } else {
5419 return 0;
5420 }
5421 }
5422
5423 void os::Kernel32Dll::initializeCommon() {
5424 if (!initialized) {
5425 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5426 assert(handle != NULL, "Just check");
5427 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5428 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5429 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5430 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5431 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5432 initialized = TRUE;
5433 }
5434 }
5435
5436
5437
5438 #ifndef JDK6_OR_EARLIER
5439
5440 void os::Kernel32Dll::initialize() {
5441 initializeCommon();
5442 }
5443
5444
5445 // Kernel32 API
5446 inline BOOL os::Kernel32Dll::SwitchToThread() {
5447 return ::SwitchToThread();
5448 }
5449
5450 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5451 return true;
5452 }
5453
5454 // Help tools
5455 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5456 return true;
5457 }
5458
5459 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5460 DWORD th32ProcessId) {
5461 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5462 }
5463
5464 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5465 LPMODULEENTRY32 lpme) {
5466 return ::Module32First(hSnapshot, lpme);
5467 }
5468
5469 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5470 LPMODULEENTRY32 lpme) {
5471 return ::Module32Next(hSnapshot, lpme);
5472 }
5473
5474 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5475 ::GetNativeSystemInfo(lpSystemInfo);
5476 }
5477
5478 // PSAPI API
5479 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5480 HMODULE *lpModule, DWORD cb,
5481 LPDWORD lpcbNeeded) {
5482 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5483 }
5484
5485 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5486 HMODULE hModule,
5487 LPTSTR lpFilename,
5488 DWORD nSize) {
5489 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5490 }
5491
5492 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5493 HMODULE hModule,
5494 LPMODULEINFO lpmodinfo,
5495 DWORD cb) {
5496 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5497 }
5498
5499 inline BOOL os::PSApiDll::PSApiAvailable() {
5500 return true;
5501 }
5502
5503
5504 // WinSock2 API
5505 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5506 LPWSADATA lpWSAData) {
5507 return ::WSAStartup(wVersionRequested, lpWSAData);
5508 }
5509
5510 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5511 return ::gethostbyname(name);
5512 }
5513
5514 inline BOOL os::WinSock2Dll::WinSock2Available() {
5515 return true;
5516 }
5517
5518 // Advapi API
5519 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5520 BOOL DisableAllPrivileges,
5521 PTOKEN_PRIVILEGES NewState,
5522 DWORD BufferLength,
5523 PTOKEN_PRIVILEGES PreviousState,
5524 PDWORD ReturnLength) {
5525 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5526 BufferLength, PreviousState, ReturnLength);
5527 }
5528
5529 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5530 DWORD DesiredAccess,
5531 PHANDLE TokenHandle) {
5532 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5533 }
5534
5535 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5536 LPCTSTR lpName,
5537 PLUID lpLuid) {
5538 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5539 }
5540
5541 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5542 return true;
5543 }
5544
5545 void* os::get_default_process_handle() {
5546 return (void*)GetModuleHandle(NULL);
5547 }
5548
5549 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5550 // which is used to find statically linked in agents.
5551 // Additionally for windows, takes into account __stdcall names.
5552 // Parameters:
5553 // sym_name: Symbol in library we are looking for
5554 // lib_name: Name of library to look in, NULL for shared libs.
5555 // is_absolute_path == true if lib_name is absolute path to agent
5556 // such as "C:/a/b/L.dll"
5557 // == false if only the base name of the library is passed in
5558 // such as "L"
5559 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5560 bool is_absolute_path) {
5561 char *agent_entry_name;
5562 size_t len;
5563 size_t name_len;
5564 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5565 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5566 const char *start;
5567
5568 if (lib_name != NULL) {
5569 len = name_len = strlen(lib_name);
5570 if (is_absolute_path) {
5571 // Need to strip path, prefix and suffix
5572 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5573 lib_name = ++start;
5574 } else {
5575 // Need to check for drive prefix
5576 if ((start = strchr(lib_name, ':')) != NULL) {
5577 lib_name = ++start;
5578 }
5579 }
5580 if (len <= (prefix_len + suffix_len)) {
5581 return NULL;
5582 }
5583 lib_name += prefix_len;
5584 name_len = strlen(lib_name) - suffix_len;
5585 }
5586 }
5587 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5588 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5589 if (agent_entry_name == NULL) {
5590 return NULL;
5591 }
5592 if (lib_name != NULL) {
5593 const char *p = strrchr(sym_name, '@');
5594 if (p != NULL && p != sym_name) {
5595 // sym_name == _Agent_OnLoad@XX
5596 strncpy(agent_entry_name, sym_name, (p - sym_name));
5597 agent_entry_name[(p-sym_name)] = '\0';
5598 // agent_entry_name == _Agent_OnLoad
5599 strcat(agent_entry_name, "_");
5600 strncat(agent_entry_name, lib_name, name_len);
5601 strcat(agent_entry_name, p);
5602 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5603 } else {
5604 strcpy(agent_entry_name, sym_name);
5605 strcat(agent_entry_name, "_");
5606 strncat(agent_entry_name, lib_name, name_len);
5607 }
5608 } else {
5609 strcpy(agent_entry_name, sym_name);
5610 }
5611 return agent_entry_name;
5612 }
5613
5614 #else
5615 // Kernel32 API
5616 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5617 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5618 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5619 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5620 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5621
5622 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5623 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5624 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5625 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5626 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5627
5628 void os::Kernel32Dll::initialize() {
5629 if (!initialized) {
5630 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5631 assert(handle != NULL, "Just check");
5632
5633 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5634 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5635 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5636 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5637 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5638 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5639 initializeCommon(); // resolve the functions that always need resolving
5640
5641 initialized = TRUE;
5642 }
5643 }
5644
5645 BOOL os::Kernel32Dll::SwitchToThread() {
5646 assert(initialized && _SwitchToThread != NULL,
5647 "SwitchToThreadAvailable() not yet called");
5648 return _SwitchToThread();
5649 }
5650
5651
5652 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5653 if (!initialized) {
5654 initialize();
5655 }
5656 return _SwitchToThread != NULL;
5657 }
5658
5659 // Help tools
5660 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5661 if (!initialized) {
5662 initialize();
5663 }
5664 return _CreateToolhelp32Snapshot != NULL &&
5665 _Module32First != NULL &&
5666 _Module32Next != NULL;
5667 }
5668
5669 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5670 DWORD th32ProcessId) {
5671 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5672 "HelpToolsAvailable() not yet called");
5673
5674 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5675 }
5676
5677 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5678 assert(initialized && _Module32First != NULL,
5679 "HelpToolsAvailable() not yet called");
5680
5681 return _Module32First(hSnapshot, lpme);
5682 }
5683
5684 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5685 LPMODULEENTRY32 lpme) {
5686 assert(initialized && _Module32Next != NULL,
5687 "HelpToolsAvailable() not yet called");
5688
5689 return _Module32Next(hSnapshot, lpme);
5690 }
5691
5692
5693 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5694 if (!initialized) {
5695 initialize();
5696 }
5697 return _GetNativeSystemInfo != NULL;
5698 }
5699
5700 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5701 assert(initialized && _GetNativeSystemInfo != NULL,
5702 "GetNativeSystemInfoAvailable() not yet called");
5703
5704 _GetNativeSystemInfo(lpSystemInfo);
5705 }
5706
5707 // PSAPI API
5708
5709
5710 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5711 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5712 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5713
5714 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5715 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5716 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5717 BOOL os::PSApiDll::initialized = FALSE;
5718
5719 void os::PSApiDll::initialize() {
5720 if (!initialized) {
5721 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5722 if (handle != NULL) {
5723 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5724 "EnumProcessModules");
5725 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5726 "GetModuleFileNameExA");
5727 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5728 "GetModuleInformation");
5729 }
5730 initialized = TRUE;
5731 }
5732 }
5733
5734
5735
5736 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5737 DWORD cb, LPDWORD lpcbNeeded) {
5738 assert(initialized && _EnumProcessModules != NULL,
5739 "PSApiAvailable() not yet called");
5740 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5741 }
5742
5743 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5744 LPTSTR lpFilename, DWORD nSize) {
5745 assert(initialized && _GetModuleFileNameEx != NULL,
5746 "PSApiAvailable() not yet called");
5747 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5748 }
5749
5750 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5751 LPMODULEINFO lpmodinfo, DWORD cb) {
5752 assert(initialized && _GetModuleInformation != NULL,
5753 "PSApiAvailable() not yet called");
5754 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5755 }
5756
5757 BOOL os::PSApiDll::PSApiAvailable() {
5758 if (!initialized) {
5759 initialize();
5760 }
5761 return _EnumProcessModules != NULL &&
5762 _GetModuleFileNameEx != NULL &&
5763 _GetModuleInformation != NULL;
5764 }
5765
5766
5767 // WinSock2 API
5768 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5769 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5770
5771 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5772 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5773 BOOL os::WinSock2Dll::initialized = FALSE;
5774
5775 void os::WinSock2Dll::initialize() {
5776 if (!initialized) {
5777 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5778 if (handle != NULL) {
5779 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5780 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5781 }
5782 initialized = TRUE;
5783 }
5784 }
5785
5786
5787 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5788 assert(initialized && _WSAStartup != NULL,
5789 "WinSock2Available() not yet called");
5790 return _WSAStartup(wVersionRequested, lpWSAData);
5791 }
5792
5793 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5794 assert(initialized && _gethostbyname != NULL,
5795 "WinSock2Available() not yet called");
5796 return _gethostbyname(name);
5797 }
5798
5799 BOOL os::WinSock2Dll::WinSock2Available() {
5800 if (!initialized) {
5801 initialize();
5802 }
5803 return _WSAStartup != NULL &&
5804 _gethostbyname != NULL;
5805 }
5806
5807 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5808 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5809 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5810
5811 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5812 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5813 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5814 BOOL os::Advapi32Dll::initialized = FALSE;
5815
5816 void os::Advapi32Dll::initialize() {
5817 if (!initialized) {
5818 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5819 if (handle != NULL) {
5820 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5821 "AdjustTokenPrivileges");
5822 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5823 "OpenProcessToken");
5824 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5825 "LookupPrivilegeValueA");
5826 }
5827 initialized = TRUE;
5828 }
5829 }
5830
5831 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5832 BOOL DisableAllPrivileges,
5833 PTOKEN_PRIVILEGES NewState,
5834 DWORD BufferLength,
5835 PTOKEN_PRIVILEGES PreviousState,
5836 PDWORD ReturnLength) {
5837 assert(initialized && _AdjustTokenPrivileges != NULL,
5838 "AdvapiAvailable() not yet called");
5839 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5840 BufferLength, PreviousState, ReturnLength);
5841 }
5842
5843 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5844 DWORD DesiredAccess,
5845 PHANDLE TokenHandle) {
5846 assert(initialized && _OpenProcessToken != NULL,
5847 "AdvapiAvailable() not yet called");
5848 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5849 }
5850
5851 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5852 LPCTSTR lpName, PLUID lpLuid) {
5853 assert(initialized && _LookupPrivilegeValue != NULL,
5854 "AdvapiAvailable() not yet called");
5855 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5856 }
5857
5858 BOOL os::Advapi32Dll::AdvapiAvailable() {
5859 if (!initialized) {
5860 initialize();
5861 }
5862 return _AdjustTokenPrivileges != NULL &&
5863 _OpenProcessToken != NULL &&
5864 _LookupPrivilegeValue != NULL;
5865 }
5866
5867 #endif
5868
5869 #ifndef PRODUCT
5870
5871 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5872 // contiguous memory block at a particular address.
5873 // The test first tries to find a good approximate address to allocate at by using the same
5874 // method to allocate some memory at any address. The test then tries to allocate memory in
5875 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5876 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5877 // the previously allocated memory is available for allocation. The only actual failure
5878 // that is reported is when the test tries to allocate at a particular location but gets a
5879 // different valid one. A NULL return value at this point is not considered an error but may
5880 // be legitimate.
5881 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5882 void TestReserveMemorySpecial_test() {
5883 if (!UseLargePages) {
5884 if (VerboseInternalVMTests) {
5885 gclog_or_tty->print("Skipping test because large pages are disabled");
5886 }
5887 return;
5888 }
5889 // save current value of globals
5890 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5891 bool old_use_numa_interleaving = UseNUMAInterleaving;
5892
5893 // set globals to make sure we hit the correct code path
5894 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5895
5896 // do an allocation at an address selected by the OS to get a good one.
5897 const size_t large_allocation_size = os::large_page_size() * 4;
5898 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5899 if (result == NULL) {
5900 if (VerboseInternalVMTests) {
5901 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5902 large_allocation_size);
5903 }
5904 } else {
5905 os::release_memory_special(result, large_allocation_size);
5906
5907 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5908 // we managed to get it once.
5909 const size_t expected_allocation_size = os::large_page_size();
5910 char* expected_location = result + os::large_page_size();
5911 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5912 if (actual_location == NULL) {
5913 if (VerboseInternalVMTests) {
5914 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5915 expected_location, large_allocation_size);
5916 }
5917 } else {
5918 // release memory
5919 os::release_memory_special(actual_location, expected_allocation_size);
5920 // only now check, after releasing any memory to avoid any leaks.
5921 assert(actual_location == expected_location,
5922 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5923 expected_location, expected_allocation_size, actual_location));
5924 }
5925 }
5926
5927 // restore globals
5928 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5929 UseNUMAInterleaving = old_use_numa_interleaving;
5930 }
5931 #endif // PRODUCT